The HY-2 satellite carrying a satellite-borne GPS receiver is the first Chinese radar altimeter satellite, whose radial orbit determination precision must reach the centimeter level. Now HY-2 is in the test phase so t...The HY-2 satellite carrying a satellite-borne GPS receiver is the first Chinese radar altimeter satellite, whose radial orbit determination precision must reach the centimeter level. Now HY-2 is in the test phase so that the observations are not openly released. In order to study the precise orbit determination precision and procedure for HY-2 based on the satellite- borne GPS technique, the satellite-borne GPS data are simulated in this paper. The HY-2 satellite-borne GPS antenna can receive at least seven GPS satellites each epoch, which can validate the GPS receiver and antenna design. What's more, the precise orbit determination processing flow is given and precise orbit determination experiments are conducted using the HY-2-borne GPS data with both the reduced-dynamic method and the kinematic geometry method. With the 1 and 3 mm phase data random errors, the radial orbit determination precision can achieve the centimeter level using these two methods and the kinematic orbit accuracy is slightly lower than that of the reduced-dynamic orbit. The earth gravity field model is an important factor which seriously affects the precise orbit determination of altimeter satellites. The reduced-dynamic orbit determination experiments are made with different earth gravity field models, such as EIGEN2, EGM96, TEG4, and GEMT3. Using a large number of high precision satellite-bome GPS data, the HY-2 precise orbit determination can reach the centimeter level with commonly used earth gravity field models up to above 50 degrees and orders.展开更多
Embryogenic calli were induced from the seeds of creeping bentgrass ( Agrostis palustris Huds.) cv. Regent and colonial bentgrass ( Agrostis Tenuis Sibth. Fl. Oxen.) cv. Tiger. The embryogenic calli were precult...Embryogenic calli were induced from the seeds of creeping bentgrass ( Agrostis palustris Huds.) cv. Regent and colonial bentgrass ( Agrostis Tenuis Sibth. Fl. Oxen.) cv. Tiger. The embryogenic calli were precultured on fresh medium for 4-7 days and then co cultivated with Agrobacterium tumefaciens , LBA4404, which contains plasmid vector pSBGM harboring bar coding region, synthetic green fluorescent protein (sGFP) coding region and matrix attachment region (MAR). After 3 days of co cultivation, the calli were washed thoroughly and transferred to MS medium containing 2 mg/L of 2, 4 D, 12-15 mg/L phosphinothricin (PPT) and 250 mg/L of cefotaxime. After 2-3 months of selection, the actively growing calli of 'Regent' and 'Tiger' were transferred to MS medium with 12-15 mg/L PPT and 250 mg/L cefotaxime for regeneration. The putative transformants were maintained on MS medium with 3 mg/L PPT for long period but control died within 1 month. After establishing in greenhouse, the transformants also showed strong resistance to 0.4% of herbicide Basta but control plants died within 2 weeks. Under confocal microscope, both young leaves and roots showed significant GFP expression. PCR analysis revealed the presence of a DNA fragment of GFP gene at the expected size (380 bp) in the transformants and its absence in a randomly selected control plant.展开更多
Based on the theory of Canonical Correlation Analysis (CCA), the correlation between 500 hPa geopotential height (H) fields over the Northern Hemisphere (NH) and a 15-region rainfall (R) field of China in May is studi...Based on the theory of Canonical Correlation Analysis (CCA), the correlation between 500 hPa geopotential height (H) fields over the Northern Hemisphere (NH) and a 15-region rainfall (R) field of China in May is studied. The results indicate that: (1) there is a strong relationship between the H fields in January / May and the R field in China, (2) the variation of the general circulation over the whole NH (especially the 500 hPa H field over Europe and Asia) can affect the R in China, (3) in January and February the atmospheric general circulation can affect the R mainly by means of planetary waves, while in April and May the main control mechanism can be due to some teleconnections, and (4) the characteristic vectors for R in May and H from January to May have wave train structure, alternating sign from south to north.展开更多
On the basis of Navier-Stockes equation and convection-diffusion equation, combined with surface tension and penetration models, the equations of moment and mass transfer between bubble and the ambient non-Newtonian l...On the basis of Navier-Stockes equation and convection-diffusion equation, combined with surface tension and penetration models, the equations of moment and mass transfer between bubble and the ambient non-Newtonian liquid were established. The formation of a single bubble from a submersed nozzle of 1.0 mm diameter and the mass transfer from an artificially fixed bubble into the ambient liquid were simulated by the volume-of-fluid (VOF) method. Good agreement between simulation results and experimental data confirmed the validity of the numerical method. Furthermore, the concentration distribution around rising bubbles in shear thinning non-Newtonian fluid was simulated. When the process of a single ellipsoidal bubble with the bubble deformation rate below 2.0 rises, the concentration distribution is a single-tail in the bubble's wake, but it is fractal when thebubble deformation rate is greater than 2.0. For the overtaking of two in-line rising bubbles, the concentration distribution area between two bubbles broadens gradually and then coalescence occurs. The bifurcation of concentration distribution appears in the rear of the resultant bubble.展开更多
The magnetotelluric (MT) method has been among the favorite supporting tools for seismic imaging of sub-salt and sub-basalt targets. In this paper we present an example from Kachchh, India (where basaltic rocks ove...The magnetotelluric (MT) method has been among the favorite supporting tools for seismic imaging of sub-salt and sub-basalt targets. In this paper we present an example from Kachchh, India (where basaltic rocks overlie Mesozoic sedimentary rocks), and discuss the feasibility of using MT method as an exploration tool in this geological setting. Our results highlight the difference in magnetotelluric response caused by the thin intrabasalt layering. The key issue addressed in this paper is what MT can and cannot provide in such geological settings. First, we compute apparent resistivity and phase response curves using representative resistivity-depth models and borehole data from the study area. Later, we compare these results to assess the plausibility of using MT to image the sub-volcanic sediments at Kachchh. Finally, we substantiate our discussion through one-dimensional inversion of the field observed MT data from this region that exhibits poor sensitivity of MT for thin basalt layers.展开更多
Phased Array Feed (PAF) is a small two-dimensional phased array antenna, playing a role as the multi-beam feed for the reflector antenna. The prominent capability of large continuous Field-of-View (FoV) coverage and f...Phased Array Feed (PAF) is a small two-dimensional phased array antenna, playing a role as the multi-beam feed for the reflector antenna. The prominent capability of large continuous Field-of-View (FoV) coverage and fast survey speed makes PAF the promising feed for radio telescopes. In this paper, the effect of feed array of PAF on the gain fluctuations over FoV is analyzed on a sim- plified model of the Five-hundred-meter Spherical Aperture radio Telescope (FAST), including illu- mination pattern edge taper, element spacing, element arrangement and element amount. And the differences between rectangular and hexagonal array arrangements are compared. The relationship between the FoV and array configuration are concluded at last.展开更多
The carbon (C) sequestration potential of turfgrass systems has been investigated and demonstrated from several studies. The role of these ecosystems in continental and Mediterranean climates though, is not yet clea...The carbon (C) sequestration potential of turfgrass systems has been investigated and demonstrated from several studies. The role of these ecosystems in continental and Mediterranean climates though, is not yet clearly understood because environmental limiting factors and management intensities can strongly influence the overall C budget. The aim of the present study is to improve the understanding of the mechanisms underlying C fluxes in a turfgrass ecosystem and to assess its C sequestration potential by estimating the annual C budget. NEE (Net Ecosystem Exchange) of turfgrass was calculated in its seasonal variation over one year, and compared between areas characterized by different degrees of maintenance. The C sequestration potential of the turfgrass was investigated in a golf course near Verona (Italy), adopting a small-chamber enclosure approach. The measurements of gas exchanges between biosphere and atmosphere, permitted to estimate the NEE, as a function of different management intensities. The intensity of management seems to have influence on its C balance. This study needs further research to understand which maintenance variables are determinant on turfgrass C sequestration.展开更多
The purpose of this article is to identify, through the methodology, the impact that the quality of football fields and their continuous improvement influences the football players and the football level in general, a...The purpose of this article is to identify, through the methodology, the impact that the quality of football fields and their continuous improvement influences the football players and the football level in general, as well as the advantages; and disadvantages of this process. In the meantime, it reveals the football field's quality effects in the performance at the national championships, at television transmission rights, and sale of football players to foreign clubs. In addition, the dynamics of investment in the last two decades and the Albanian Football Federation objectives for the future are an important part of this article展开更多
This work aims at understanding the tactical action of soccer players from the point of view of Peirce's pragmatism. We will focus on the maxim of pragmatism, in which the elements of every concept enter into logical...This work aims at understanding the tactical action of soccer players from the point of view of Peirce's pragmatism. We will focus on the maxim of pragmatism, in which the elements of every concept enter into logical thinking through the doors of perception and leave through the doors of utilitarian actions. In this paper, we investigate the formation of a habit able to manage collective actions on a soccer field. The efficiency of this habit is related to collateral experience shared among soccer players: characteristics of high performance sports training. This unique experience orchestrates perceptions and reasoning, leading to efficient combination of conclusions and influences collective actions. We will analyze the concept that we call avalanche in bow-arrow applied to the 1970's Brazilian soccer team.展开更多
The aim of this study was to analyze the effects of mechanical perforation of a golf course grassy sward, subject to maintenance machinery traffic and golf players trampling on its compaction and density. The evolutio...The aim of this study was to analyze the effects of mechanical perforation of a golf course grassy sward, subject to maintenance machinery traffic and golf players trampling on its compaction and density. The evolution of soil compaction state after aeration was also conducted in four stages of measurement. This operation aims to improve the structure and soil texture, which is also called "perforation" or "coring". The taken cores leaving on the soil holes of adjustable depth and density (350 holes/mE) are made with an aerator machine called Vertidrain. Soil resistance to penetration and density were determined at the initial state before aeration as well as 10, 20, and 30 days after aeration. Compared to the initial state, the results show that mechanical aeration greatly affects the grassy sward ground by reducing its resistance to penetration as 35% and 43% decrease in penetration resistance were noticed at 5 cm depth l0 and 20 days after aeration, respectively. Also, resistance to penetration decreased by 41% and 48% at 15 cm depth during the same two periods of time with a relatively constant moisture content. However, soil resistance to penetration at 5 and 15 cm depths only decreased by 21% and 26%, respectively. Regarding the soil density measured after aeration, a significant improvement at the 1% level with the method of variance analysis was observed compared to that at the initial state (e.g. 1.33 g·cm^-3) Indeed, the density was 1.29, 1.26 and 1.30 gcm^-3 10, 20 and 30 days after aeration, respectively.展开更多
Under the external AC and DC electric field, the effective response of nonlinear spherical coated composites, which obey the constitutive relation of electric displaeement and electric field, is investigated in the di...Under the external AC and DC electric field, the effective response of nonlinear spherical coated composites, which obey the constitutive relation of electric displaeement and electric field, is investigated in the dilute limit by using the perturbation method. The local potentials in inclusion and host regions are derived at all harmonics. Moreover, the formulae of the effective linear and nonlinear responses are given in the dilute limit.展开更多
To be successful in global markets, companies from the emerging countries need the approval of foreign investors and other stakeholders. In this regard, Brazil, Russia, India, and China (BRIC) have progressively str...To be successful in global markets, companies from the emerging countries need the approval of foreign investors and other stakeholders. In this regard, Brazil, Russia, India, and China (BRIC) have progressively strengthened their corporate governance rules to help their companies overcome the competitors from the old industrialized countries. Directors' non-executive qualification, independence, and professional expertise represent basic requirements for effective corporate governance, so they should be carefully considered to guarantee a proper board composition and an adequate establishment of internal committees in listed companies. The paper intends to compare the legislative and regulatory frameworks adopted by the four countries; then it aims at answering to the following research questions by means of an empirical investigation: Have BRIC companies appointed non-executive and independent board members? What do BRIC companies do in order to assure an effective participation of non-executive and independent board members to corporate governance activities? Have BRIC companies established internal committees? The research examines the appointment of non-executive directors and independent directors to the boards of 100 BRIC leading firms, as well as their involvement in internal committees focused on matters requiring motivated and impartial opinions. Although the laws and recommendations seem to favor a general convergence of corporate governance principles among the four BRIC and towards the international best practices, some differences and peculiarities emerge from a firm-level perspective. Indeed, the Indian and the Chinese companies analyzed appear more inclined than the Brazilian and the Russian ones to reassure their international stakeholders about board independence and effective committees.展开更多
The "OLI paradigm" of Dunning (1977) claims that firm internationalization is addressed toward the exploitation of home-based specific advantages. However, evidence shows that SMEs are increasingly internationaliz...The "OLI paradigm" of Dunning (1977) claims that firm internationalization is addressed toward the exploitation of home-based specific advantages. However, evidence shows that SMEs are increasingly internationalizing their activities in order to enrich their resource pool. In this regard, a reinterpretation of the OLI paradigm came out with a new perspective suggesting that "foreign direct investmenf' (FDI) is increasingly oriented toward asset augmentation. Correspondingly, the purpose of this theoretical paper is to suggest a set of principles that could inform on how global small and medium-sized enterprises grow in the international marketplace when investing abroad.展开更多
Organizations need to use a proved methodology to reduce implementation risks and enable the enterprise resource planning (ERP) solution to be put into operation as quickly as possible. The right implementation meth...Organizations need to use a proved methodology to reduce implementation risks and enable the enterprise resource planning (ERP) solution to be put into operation as quickly as possible. The right implementation methodology will also help ensure that the ERP implementation fully addresses an organization's business goals and objectives. Modern ERP implementation methodology encourages and supports a progressive approach to the management for users of ERP systems. A company is constantly seeking better methods and models for decision supports in all kinds of decisions and developing/copying new products/markets that generate the growth of the company. On the other hand, a company creates efficient and effective operations that improve the return on investment, because ERP is always considered as an asset. This paper focuses on the interaction of culture in a company, business strategy, and organizational skills and balances the relationship among ERP methodology, ERP implementation, and the performance of the company. Considering the fact that different ERP systems use different methodologies, short descriptions of the most dominant brand name ERP are analyzed (Oracle Financials, PeopleSoft, and systems, applications, and products (SAP) implementation methodology). Although all methodologies may look similar, the selection of a proper methodology is the most critical part in ERP investment. The focus of this paper is on the accelerated SAP methodology, also named as ASAP methodology, because it is the most used one on the worldwide market of ERP systems.展开更多
This paper's purpose is to present a reflective analysis about the process of transnationalization in which the technique of assisted human reproduction has been going to the extent that such a procedure has been rev...This paper's purpose is to present a reflective analysis about the process of transnationalization in which the technique of assisted human reproduction has been going to the extent that such a procedure has been revealed as a true "fertility tourism", offered through packages for those people who have financial conditions, but cannot through natural means to realize the dream of membership. Through the dialectic method of discourse, promoting the comparison of the thought of many authors who focus on issues such as globalization, commodification of human, technical exacerbation detriment of humans, and their interpersonal relations, the author seeks to introduce issues that are the order of day with respect to this global market arising from the tremendous advances reproductive techniques in a society marked by economic interests, it turns much more to the consumer and considers the human being as an additional asset to be sold, since its conception. The author acknowledges that they cease for tourism human reproduction is a trade that is worth of human frailty, because relying on one of the most intimate aspects of life: the desire to be a mother or father or ultimately, the perpetuation of the species.展开更多
With the concern for environmental quality and food safety, organic food products are becoming more important in the global market. In recent years the organic food industry has been expanding and sales of organic pro...With the concern for environmental quality and food safety, organic food products are becoming more important in the global market. In recent years the organic food industry has been expanding and sales of organic products have been increasing. Abundant studies have been done focusing on organic fruits and vegetables which focused on the shortage of organic live stocks. In this paper we focus our attention on organic pork products. Using a sample of 400 Thais consumers, this study proposes the contingent valuation (CV) technique to measure the willingness of individuals to pay a price premium for organic pork in Thailand. In order to obtain the mean "willingness to pay" (WTP), a bivariate probit model was applied to provide information about the crucial variables that affect the WTP. The study revealed that variables that better approximate WTP are based on the lifestyle and knowledge about organic foods rather than the usual socioeconomic factors. The mean WTP on the premium price for organic pork is approximately 34.30 Bath per kg. In order to access the market potential this study shows that the suitable attributes of organic pork which is consistent with consumer preferences are composed of modernized and environmental packaging with special product details. Marketing this product to the buyer it should be set at a reasonable price. Stimulating the market should be done by doing sales promotion and public relations on a regularly basis. In addition, organic pork should be available in any places and convenient for customers to buy.展开更多
Simple GNSS navigation receivers, developed for the mass market, can be used for positioning with sub centimeter accuracy in a wireless sensor network if the read-out of the carrier phase data is possible and all data...Simple GNSS navigation receivers, developed for the mass market, can be used for positioning with sub centimeter accuracy in a wireless sensor network if the read-out of the carrier phase data is possible and all data is permanently broadcast to a central computer for near real time processing of the respective base lines. Experiences gained in two research projects related to landslide monitoring are depicted in terms of quality and reliability of the results by the developed approach. As far as possible a modular system set up with commercial off-the-shelf components, e.g., standard WLAN fur commtmication, solar batteries with solar panels for autarkic power supply and in cooperation of existing proofed program tools is chosen. The challenge of the still ongoing development is to have a flexible and robust GNSS based sensor network available - concerned not only for landslide monitoring in future.展开更多
This application note discusses the preliminary results of paleomagnetics studies of several incisions of the Paleozoic period the territory of Armenia and neighboring regions (Minor Caucasus). It is supposed that b...This application note discusses the preliminary results of paleomagnetics studies of several incisions of the Paleozoic period the territory of Armenia and neighboring regions (Minor Caucasus). It is supposed that before the Permian period the Armenian-lranian Mezocontinent was uniform with Afro-Arabia and only at the end of the late Paleozoic the formed Mesozoic ocean separated these areas from each other. A result of application of the complex laboratory investigations were identified from samples of primary magnetization the direction of which corresponds to the time of formation of the studied rocks. On the basis of paleomagnetic researches of Triassic, Permian, Devonian, Carbonian rocks a preliminary conclusion has been made about the dipole configuration of the geomagnetic field throughout Paleozoic. The comparison of the obtained data to paleomagnetic definitions of African, Arabian plates, Europe and the Siberian platform leads to the conclusion that the Minor Caucasus existed separately from the present general lithosphere blocks of Greater Caucasus and Europe.展开更多
Albanian business environment is defined by complexity, dynamism, uncertainty. In Albania, there are small and medium enterprises (businesses). Although we have a high degree of business bankrupt, many businesses ar...Albanian business environment is defined by complexity, dynamism, uncertainty. In Albania, there are small and medium enterprises (businesses). Although we have a high degree of business bankrupt, many businesses are reinforcing their competitive positions in market. In these conditions, a new appropriate organizational structure often plays a crucial role in managing the challenges. While the finn grows, at the same time grows the need for organization, involvement and leadership. In today's changing times, effective leadership is a key component of organizational success. Even if management is the key of operation and the standard operating procedures, our study shows that the manager always need leader's power. In today's global marketplace, organizations that strategically focus on building leadership capacity for the future will reap the benefits in the years to come. New trends in business development, of course have increased requirements for local managers. The organizations are under pressure to show return on investment for training and development. Although positive trends, problems which management is faced are more challenging than the degree of preparation and performance that they offer, so their qualitative qualification remains the continuous preoccupation as the role of our school is in this direction. From this point of view, education in distance can be considered as complementary approach and in some conditions as a worthy replacement of direct education, which still dominates educative systems in Albania.展开更多
基金supported partially by the National Natural Science Foundation of China (Nos. 40974004 and 40974016)Key Laboratory of Dynamic Geodesy of CAS, China (No. L09-01) R&I Team Support Program and the Graduate Science and Technology Foundation of SDUST, China (No. YCA110403)
文摘The HY-2 satellite carrying a satellite-borne GPS receiver is the first Chinese radar altimeter satellite, whose radial orbit determination precision must reach the centimeter level. Now HY-2 is in the test phase so that the observations are not openly released. In order to study the precise orbit determination precision and procedure for HY-2 based on the satellite- borne GPS technique, the satellite-borne GPS data are simulated in this paper. The HY-2 satellite-borne GPS antenna can receive at least seven GPS satellites each epoch, which can validate the GPS receiver and antenna design. What's more, the precise orbit determination processing flow is given and precise orbit determination experiments are conducted using the HY-2-borne GPS data with both the reduced-dynamic method and the kinematic geometry method. With the 1 and 3 mm phase data random errors, the radial orbit determination precision can achieve the centimeter level using these two methods and the kinematic orbit accuracy is slightly lower than that of the reduced-dynamic orbit. The earth gravity field model is an important factor which seriously affects the precise orbit determination of altimeter satellites. The reduced-dynamic orbit determination experiments are made with different earth gravity field models, such as EIGEN2, EGM96, TEG4, and GEMT3. Using a large number of high precision satellite-bome GPS data, the HY-2 precise orbit determination can reach the centimeter level with commonly used earth gravity field models up to above 50 degrees and orders.
文摘Embryogenic calli were induced from the seeds of creeping bentgrass ( Agrostis palustris Huds.) cv. Regent and colonial bentgrass ( Agrostis Tenuis Sibth. Fl. Oxen.) cv. Tiger. The embryogenic calli were precultured on fresh medium for 4-7 days and then co cultivated with Agrobacterium tumefaciens , LBA4404, which contains plasmid vector pSBGM harboring bar coding region, synthetic green fluorescent protein (sGFP) coding region and matrix attachment region (MAR). After 3 days of co cultivation, the calli were washed thoroughly and transferred to MS medium containing 2 mg/L of 2, 4 D, 12-15 mg/L phosphinothricin (PPT) and 250 mg/L of cefotaxime. After 2-3 months of selection, the actively growing calli of 'Regent' and 'Tiger' were transferred to MS medium with 12-15 mg/L PPT and 250 mg/L cefotaxime for regeneration. The putative transformants were maintained on MS medium with 3 mg/L PPT for long period but control died within 1 month. After establishing in greenhouse, the transformants also showed strong resistance to 0.4% of herbicide Basta but control plants died within 2 weeks. Under confocal microscope, both young leaves and roots showed significant GFP expression. PCR analysis revealed the presence of a DNA fragment of GFP gene at the expected size (380 bp) in the transformants and its absence in a randomly selected control plant.
基金Project "973" (G1998040905) a project of the Chinese Academy of Sciences (KZCX2-203) Natural Science Foundation of China (40065001)
文摘Based on the theory of Canonical Correlation Analysis (CCA), the correlation between 500 hPa geopotential height (H) fields over the Northern Hemisphere (NH) and a 15-region rainfall (R) field of China in May is studied. The results indicate that: (1) there is a strong relationship between the H fields in January / May and the R field in China, (2) the variation of the general circulation over the whole NH (especially the 500 hPa H field over Europe and Asia) can affect the R in China, (3) in January and February the atmospheric general circulation can affect the R mainly by means of planetary waves, while in April and May the main control mechanism can be due to some teleconnections, and (4) the characteristic vectors for R in May and H from January to May have wave train structure, alternating sign from south to north.
基金Supported by the National iqatural Science Foundation of China (21076139).
文摘On the basis of Navier-Stockes equation and convection-diffusion equation, combined with surface tension and penetration models, the equations of moment and mass transfer between bubble and the ambient non-Newtonian liquid were established. The formation of a single bubble from a submersed nozzle of 1.0 mm diameter and the mass transfer from an artificially fixed bubble into the ambient liquid were simulated by the volume-of-fluid (VOF) method. Good agreement between simulation results and experimental data confirmed the validity of the numerical method. Furthermore, the concentration distribution around rising bubbles in shear thinning non-Newtonian fluid was simulated. When the process of a single ellipsoidal bubble with the bubble deformation rate below 2.0 rises, the concentration distribution is a single-tail in the bubble's wake, but it is fractal when thebubble deformation rate is greater than 2.0. For the overtaking of two in-line rising bubbles, the concentration distribution area between two bubbles broadens gradually and then coalescence occurs. The bifurcation of concentration distribution appears in the rear of the resultant bubble.
文摘The magnetotelluric (MT) method has been among the favorite supporting tools for seismic imaging of sub-salt and sub-basalt targets. In this paper we present an example from Kachchh, India (where basaltic rocks overlie Mesozoic sedimentary rocks), and discuss the feasibility of using MT method as an exploration tool in this geological setting. Our results highlight the difference in magnetotelluric response caused by the thin intrabasalt layering. The key issue addressed in this paper is what MT can and cannot provide in such geological settings. First, we compute apparent resistivity and phase response curves using representative resistivity-depth models and borehole data from the study area. Later, we compare these results to assess the plausibility of using MT to image the sub-volcanic sediments at Kachchh. Finally, we substantiate our discussion through one-dimensional inversion of the field observed MT data from this region that exhibits poor sensitivity of MT for thin basalt layers.
基金Partly supported by the Ministry of Science and Technology of the People's Republic of China under the State Key Development Program for Basic Research (No. 2012CB821800)
文摘Phased Array Feed (PAF) is a small two-dimensional phased array antenna, playing a role as the multi-beam feed for the reflector antenna. The prominent capability of large continuous Field-of-View (FoV) coverage and fast survey speed makes PAF the promising feed for radio telescopes. In this paper, the effect of feed array of PAF on the gain fluctuations over FoV is analyzed on a sim- plified model of the Five-hundred-meter Spherical Aperture radio Telescope (FAST), including illu- mination pattern edge taper, element spacing, element arrangement and element amount. And the differences between rectangular and hexagonal array arrangements are compared. The relationship between the FoV and array configuration are concluded at last.
文摘The carbon (C) sequestration potential of turfgrass systems has been investigated and demonstrated from several studies. The role of these ecosystems in continental and Mediterranean climates though, is not yet clearly understood because environmental limiting factors and management intensities can strongly influence the overall C budget. The aim of the present study is to improve the understanding of the mechanisms underlying C fluxes in a turfgrass ecosystem and to assess its C sequestration potential by estimating the annual C budget. NEE (Net Ecosystem Exchange) of turfgrass was calculated in its seasonal variation over one year, and compared between areas characterized by different degrees of maintenance. The C sequestration potential of the turfgrass was investigated in a golf course near Verona (Italy), adopting a small-chamber enclosure approach. The measurements of gas exchanges between biosphere and atmosphere, permitted to estimate the NEE, as a function of different management intensities. The intensity of management seems to have influence on its C balance. This study needs further research to understand which maintenance variables are determinant on turfgrass C sequestration.
文摘The purpose of this article is to identify, through the methodology, the impact that the quality of football fields and their continuous improvement influences the football players and the football level in general, as well as the advantages; and disadvantages of this process. In the meantime, it reveals the football field's quality effects in the performance at the national championships, at television transmission rights, and sale of football players to foreign clubs. In addition, the dynamics of investment in the last two decades and the Albanian Football Federation objectives for the future are an important part of this article
文摘This work aims at understanding the tactical action of soccer players from the point of view of Peirce's pragmatism. We will focus on the maxim of pragmatism, in which the elements of every concept enter into logical thinking through the doors of perception and leave through the doors of utilitarian actions. In this paper, we investigate the formation of a habit able to manage collective actions on a soccer field. The efficiency of this habit is related to collateral experience shared among soccer players: characteristics of high performance sports training. This unique experience orchestrates perceptions and reasoning, leading to efficient combination of conclusions and influences collective actions. We will analyze the concept that we call avalanche in bow-arrow applied to the 1970's Brazilian soccer team.
文摘The aim of this study was to analyze the effects of mechanical perforation of a golf course grassy sward, subject to maintenance machinery traffic and golf players trampling on its compaction and density. The evolution of soil compaction state after aeration was also conducted in four stages of measurement. This operation aims to improve the structure and soil texture, which is also called "perforation" or "coring". The taken cores leaving on the soil holes of adjustable depth and density (350 holes/mE) are made with an aerator machine called Vertidrain. Soil resistance to penetration and density were determined at the initial state before aeration as well as 10, 20, and 30 days after aeration. Compared to the initial state, the results show that mechanical aeration greatly affects the grassy sward ground by reducing its resistance to penetration as 35% and 43% decrease in penetration resistance were noticed at 5 cm depth l0 and 20 days after aeration, respectively. Also, resistance to penetration decreased by 41% and 48% at 15 cm depth during the same two periods of time with a relatively constant moisture content. However, soil resistance to penetration at 5 and 15 cm depths only decreased by 21% and 26%, respectively. Regarding the soil density measured after aeration, a significant improvement at the 1% level with the method of variance analysis was observed compared to that at the initial state (e.g. 1.33 g·cm^-3) Indeed, the density was 1.29, 1.26 and 1.30 gcm^-3 10, 20 and 30 days after aeration, respectively.
文摘Under the external AC and DC electric field, the effective response of nonlinear spherical coated composites, which obey the constitutive relation of electric displaeement and electric field, is investigated in the dilute limit by using the perturbation method. The local potentials in inclusion and host regions are derived at all harmonics. Moreover, the formulae of the effective linear and nonlinear responses are given in the dilute limit.
文摘To be successful in global markets, companies from the emerging countries need the approval of foreign investors and other stakeholders. In this regard, Brazil, Russia, India, and China (BRIC) have progressively strengthened their corporate governance rules to help their companies overcome the competitors from the old industrialized countries. Directors' non-executive qualification, independence, and professional expertise represent basic requirements for effective corporate governance, so they should be carefully considered to guarantee a proper board composition and an adequate establishment of internal committees in listed companies. The paper intends to compare the legislative and regulatory frameworks adopted by the four countries; then it aims at answering to the following research questions by means of an empirical investigation: Have BRIC companies appointed non-executive and independent board members? What do BRIC companies do in order to assure an effective participation of non-executive and independent board members to corporate governance activities? Have BRIC companies established internal committees? The research examines the appointment of non-executive directors and independent directors to the boards of 100 BRIC leading firms, as well as their involvement in internal committees focused on matters requiring motivated and impartial opinions. Although the laws and recommendations seem to favor a general convergence of corporate governance principles among the four BRIC and towards the international best practices, some differences and peculiarities emerge from a firm-level perspective. Indeed, the Indian and the Chinese companies analyzed appear more inclined than the Brazilian and the Russian ones to reassure their international stakeholders about board independence and effective committees.
文摘The "OLI paradigm" of Dunning (1977) claims that firm internationalization is addressed toward the exploitation of home-based specific advantages. However, evidence shows that SMEs are increasingly internationalizing their activities in order to enrich their resource pool. In this regard, a reinterpretation of the OLI paradigm came out with a new perspective suggesting that "foreign direct investmenf' (FDI) is increasingly oriented toward asset augmentation. Correspondingly, the purpose of this theoretical paper is to suggest a set of principles that could inform on how global small and medium-sized enterprises grow in the international marketplace when investing abroad.
文摘Organizations need to use a proved methodology to reduce implementation risks and enable the enterprise resource planning (ERP) solution to be put into operation as quickly as possible. The right implementation methodology will also help ensure that the ERP implementation fully addresses an organization's business goals and objectives. Modern ERP implementation methodology encourages and supports a progressive approach to the management for users of ERP systems. A company is constantly seeking better methods and models for decision supports in all kinds of decisions and developing/copying new products/markets that generate the growth of the company. On the other hand, a company creates efficient and effective operations that improve the return on investment, because ERP is always considered as an asset. This paper focuses on the interaction of culture in a company, business strategy, and organizational skills and balances the relationship among ERP methodology, ERP implementation, and the performance of the company. Considering the fact that different ERP systems use different methodologies, short descriptions of the most dominant brand name ERP are analyzed (Oracle Financials, PeopleSoft, and systems, applications, and products (SAP) implementation methodology). Although all methodologies may look similar, the selection of a proper methodology is the most critical part in ERP investment. The focus of this paper is on the accelerated SAP methodology, also named as ASAP methodology, because it is the most used one on the worldwide market of ERP systems.
文摘This paper's purpose is to present a reflective analysis about the process of transnationalization in which the technique of assisted human reproduction has been going to the extent that such a procedure has been revealed as a true "fertility tourism", offered through packages for those people who have financial conditions, but cannot through natural means to realize the dream of membership. Through the dialectic method of discourse, promoting the comparison of the thought of many authors who focus on issues such as globalization, commodification of human, technical exacerbation detriment of humans, and their interpersonal relations, the author seeks to introduce issues that are the order of day with respect to this global market arising from the tremendous advances reproductive techniques in a society marked by economic interests, it turns much more to the consumer and considers the human being as an additional asset to be sold, since its conception. The author acknowledges that they cease for tourism human reproduction is a trade that is worth of human frailty, because relying on one of the most intimate aspects of life: the desire to be a mother or father or ultimately, the perpetuation of the species.
文摘With the concern for environmental quality and food safety, organic food products are becoming more important in the global market. In recent years the organic food industry has been expanding and sales of organic products have been increasing. Abundant studies have been done focusing on organic fruits and vegetables which focused on the shortage of organic live stocks. In this paper we focus our attention on organic pork products. Using a sample of 400 Thais consumers, this study proposes the contingent valuation (CV) technique to measure the willingness of individuals to pay a price premium for organic pork in Thailand. In order to obtain the mean "willingness to pay" (WTP), a bivariate probit model was applied to provide information about the crucial variables that affect the WTP. The study revealed that variables that better approximate WTP are based on the lifestyle and knowledge about organic foods rather than the usual socioeconomic factors. The mean WTP on the premium price for organic pork is approximately 34.30 Bath per kg. In order to access the market potential this study shows that the suitable attributes of organic pork which is consistent with consumer preferences are composed of modernized and environmental packaging with special product details. Marketing this product to the buyer it should be set at a reasonable price. Stimulating the market should be done by doing sales promotion and public relations on a regularly basis. In addition, organic pork should be available in any places and convenient for customers to buy.
文摘Simple GNSS navigation receivers, developed for the mass market, can be used for positioning with sub centimeter accuracy in a wireless sensor network if the read-out of the carrier phase data is possible and all data is permanently broadcast to a central computer for near real time processing of the respective base lines. Experiences gained in two research projects related to landslide monitoring are depicted in terms of quality and reliability of the results by the developed approach. As far as possible a modular system set up with commercial off-the-shelf components, e.g., standard WLAN fur commtmication, solar batteries with solar panels for autarkic power supply and in cooperation of existing proofed program tools is chosen. The challenge of the still ongoing development is to have a flexible and robust GNSS based sensor network available - concerned not only for landslide monitoring in future.
文摘This application note discusses the preliminary results of paleomagnetics studies of several incisions of the Paleozoic period the territory of Armenia and neighboring regions (Minor Caucasus). It is supposed that before the Permian period the Armenian-lranian Mezocontinent was uniform with Afro-Arabia and only at the end of the late Paleozoic the formed Mesozoic ocean separated these areas from each other. A result of application of the complex laboratory investigations were identified from samples of primary magnetization the direction of which corresponds to the time of formation of the studied rocks. On the basis of paleomagnetic researches of Triassic, Permian, Devonian, Carbonian rocks a preliminary conclusion has been made about the dipole configuration of the geomagnetic field throughout Paleozoic. The comparison of the obtained data to paleomagnetic definitions of African, Arabian plates, Europe and the Siberian platform leads to the conclusion that the Minor Caucasus existed separately from the present general lithosphere blocks of Greater Caucasus and Europe.
文摘Albanian business environment is defined by complexity, dynamism, uncertainty. In Albania, there are small and medium enterprises (businesses). Although we have a high degree of business bankrupt, many businesses are reinforcing their competitive positions in market. In these conditions, a new appropriate organizational structure often plays a crucial role in managing the challenges. While the finn grows, at the same time grows the need for organization, involvement and leadership. In today's changing times, effective leadership is a key component of organizational success. Even if management is the key of operation and the standard operating procedures, our study shows that the manager always need leader's power. In today's global marketplace, organizations that strategically focus on building leadership capacity for the future will reap the benefits in the years to come. New trends in business development, of course have increased requirements for local managers. The organizations are under pressure to show return on investment for training and development. Although positive trends, problems which management is faced are more challenging than the degree of preparation and performance that they offer, so their qualitative qualification remains the continuous preoccupation as the role of our school is in this direction. From this point of view, education in distance can be considered as complementary approach and in some conditions as a worthy replacement of direct education, which still dominates educative systems in Albania.