An effective approach for describing complicated water quality processes is very important for river water quality management. We built two artificial neural network(ANN) models,a feed-forward back-propagation(BP) mod...An effective approach for describing complicated water quality processes is very important for river water quality management. We built two artificial neural network(ANN) models,a feed-forward back-propagation(BP) model and a radial basis function(RBF) model,to simulate the water quality of the Yangtze and Jialing Rivers in reaches crossing the city of Chongqing,P. R. China. Our models used the historical monitoring data of biological oxygen demand,dissolved oxygen,ammonia,oil and volatile phenolic compounds. Comparison with the one-dimensional traditional water quality model suggest that both BP and RBF models are superior; their higher accuracy and better goodness-of-fit indicate that the ANN calculation of water quality agrees better with measurement. It is demonstrated that ANN modeling can be a tool for estimating the water quality of the Yangtze River. Of the two ANN models,the RBF model calculates with a smaller mean error,but a larger root mean square error. More effort to identify out the causes of these differences would help optimize the structures of neural network water-quality models.展开更多
Preventing the propagation of methane or coal dust explosions through the use of active explosion-suppression systems remains one of the most underutilised explosion controls in underground coal mines. As part of the ...Preventing the propagation of methane or coal dust explosions through the use of active explosion-suppression systems remains one of the most underutilised explosion controls in underground coal mines. As part of the effort to develop better technologies to safeguard mines, the use of active barrier systems was investigated at Kloppersbos in South Africa. The system is designed to meet the requirements of the European Standard (EN 14591-4 2007) as well as the Mine Safety Standardisation in the Ministry of Coal Industry, Coal Industrial 1 Standard of the Peoples Republic of China (MT 694-1997). From the tests conducted, it can be concluded that the ExploSpot System was successful in stopping flame propagation for both methane and methane and coal dust hybrid explosions when ammonium phosphate powder was used as the suppression material. The use of this barrier will provide coal mine management with an additional explosion control close to the point of ignition and may find application within longwall faces further protecting mines against the risk of an explosion propagating throughout a mine.展开更多
62 patients with chronic colitis were randomly divided into two groups. Acupuncture and moxibustion at acupoints such as Tianshu (St 25), Guanyuan (Ren 4) were applied in the treatment group, and western drugs were ap...62 patients with chronic colitis were randomly divided into two groups. Acupuncture and moxibustion at acupoints such as Tianshu (St 25), Guanyuan (Ren 4) were applied in the treatment group, and western drugs were applied in the control group. The results showed that acupuncture and moxibustion had a marked curative effective with few side effects, and therefore was readily acceptable to the patients.展开更多
Ombrotrophic bogs are faithful archive of atmospheric metal deposition, but the potential for fens to reconstruct environmental change is often underestimated. In this study, some new data on the Pb depositional histo...Ombrotrophic bogs are faithful archive of atmospheric metal deposition, but the potential for fens to reconstruct environmental change is often underestimated. In this study, some new data on the Pb depositional history in northeast China were provided using two ^210Pb-dated peat sequences from a poor fen in the Fenghuang Mountain of Heilongjiang province. Anthropogenic, detritic and atmospheric soil sources were discriminated using a two-step sequential digestion (weak acid leaching to liberate mobile Pb which is often regarded as anthropogenic Pb, especially for recent samples) and a ratio of unsupported ^210Pb and supported ^210Pb with the logic of that the ^214Pb mainly represents the residual detritus (constant throughout the core) and the unsupported ^210Pb arises from atmospheric fallout. A higher ^210Pb/^214Pb suggests more contributions from atmospheric deposition to the Pb content in the peat, and a ratio of 10 was defined to indicate the boundary between detrific input and atmospheric deposition. The detritic Pb was estimated to be 10-13 mg·kg^-1, the anthropogenic Pb ranged from 10-80 mg·kg^-1, and the atmospheric soil-derived Pb ranged from 〈 5 mg·kg^-1 to 30 mg·kg^-1. The history of anthropogenic Pb pollution over the last 150 years was reconstructed, and the calculated Pb deposition rate (AR Pb) ranged from 5 to 56 mg·m^-2·yr^-1. Using Ti as a reliable reference, the enrichment factor of Pb (EF Pb) relative to the upper continental crust was calculated. Both AR Pb and EF Pb increased with time, especially after the foundation of the People's Republic of China. This is consistent with increasing industrialization and coal burning in the last 60 years in northeast China. The present record of anthropogenic Pb deposition was consistent with the previous reports and an increasing trend of environmental pollution due to anthropogenic activities, in contrasts to Europe and North America which have experienced a major environmental cleanup. For the first time, this work estimates atmospheric Pb deposition via a minerotrophic peat core in China. This will enhance the use of peat archives for studies of environmental change.展开更多
This paper contrasts Military Power of the People's Republic of China from the year of 2000 to 2009 and Military and Security Developments Involving People's Republic of China from the year 2010 to 2013 with corpus ...This paper contrasts Military Power of the People's Republic of China from the year of 2000 to 2009 and Military and Security Developments Involving People's Republic of China from the year 2010 to 2013 with corpus analysis. It distinguishes the new reports' differences from the old ones and tries to explore American's discourse colonization and discourse hegemony through corpus software WordSmith 5.0-Keywords and Concordance analysis of high frequency words. The significance of the study is that it enlightens military texts which will influence audiences' viewpoints and provides a new perspective for strategies replying American media war.展开更多
Objective To investigate the impact of meteorological conditions and PM2.5 on the onset of acute aortic dissection in monsoonal climate. Methods A linear regression analysis was performed in monsoonal climate epidemio...Objective To investigate the impact of meteorological conditions and PM2.5 on the onset of acute aortic dissection in monsoonal climate. Methods A linear regression analysis was performed in monsoonal climate epidemiological survey for a period of four years on the impact of meteorological factors (minimal temperature, mean temperature, maximal temperature, average daily surface temperature, day temperature range, relative humidity, mean wind speed, and atmospheric pressure) and PM2.5 concentration on the daily incidences of acute aortic dissections. Meteorological variables and PM2.5 concentration were retrieved on a daily basis from Beijing Regional Climate Center and the Ministry of Environmental Protection of the People’s Republic of China’s website, and the daily incidences of acute aortic dissections were retrieved from the Clinical Data Analysis and Reporting System in the Emergency and Critical Care Center of Beijing Anzhen Hospital. Results During the study period (from January 2011 to December 2014), 1164 patients were identified as having acute aortic dissections. The corresponding incidences in spring and autumn were 0.96 and 1.00, respectively, which significantly higher than that in summer and winter. The incidences of acute aortic dissection in a day could be predicted by diurnal temperature range (DTR) using the following linear multiple regression models: incidences of acute aortic dissection = 0.543 + 0.025 × DTR. Conclusion This is the first study to show an attributable effect of DTR on acute aortic events in monsoonal climate. Our study confirms that meteorological variables were important factors influencing the incidence of acute aortic dissection.展开更多
According to the regulations of the People's Republic of China national standard as the basis, on the part of chemical industry product quality inspection and analysis of the implementation of computer management has...According to the regulations of the People's Republic of China national standard as the basis, on the part of chemical industry product quality inspection and analysis of the implementation of computer management has developed a set of software applications, the software in chemical products quality inspection and analysis of the means of management is an innovation. The software functions, can automatically process data, judge the product grade, quality analysis, objective and fair, convenient, fast, accurate, stable, practical, and easy to popularize.展开更多
This paper describes a structural equation modeling (SEM) analysis of factors influencing architects' trust in project design teams. We undertook a survey of architects, during which we distributed 193 questionnair...This paper describes a structural equation modeling (SEM) analysis of factors influencing architects' trust in project design teams. We undertook a survey of architects, during which we distributed 193 questionnaires in 29 A-level architectural design institutes selected radomly from the altogether 59 ones in Shenzhen, P. R. China, and received 130 valid questionnaires. We used Amos 6.0 for SEM to identify significant personal construct based factors affecting interpersonal trust. The results show that only social interaction between architects significantly affects their interpersonal trust. The explained variance of trus~ is not very high in the model. Therefore, future research should add more factors into the current model. The practical implication is that team managers should promote the social interactions between team members such that the interpersonal trust level between team members can be improved.展开更多
As a typical car-dependent city, Los Angeles (LA) is extensively used as an example in research to illustrate car influences on city form. Focusing on the features of LA's geologic conditions and civil circumstance...As a typical car-dependent city, Los Angeles (LA) is extensively used as an example in research to illustrate car influences on city form. Focusing on the features of LA's geologic conditions and civil circumstances, we argued that the relationship between LA's low-density pattern and car dependence is more involved than previously deemed simple causality. The low density should be primarily credited to the spacious requirement of the mining industry, frequent earthquakes and multiethnic population of the city. Off reserves in LA fueled its economic boom and fast urbanization that coincided with the start of mass production of cheap cars, and cars became medium-priced consumables for average families. Politicians preference for short constrnction-period projects enabled fast establishment of LA's highway infrastructure. The popularity of car use in return faciliatated further development of the low-density pattern of the city. The low-density urban form and car dependence created environmental and social problems for LA. Looking at P. R. China's motorization and urban development, we found that the trajectory of Beijing's motorization between 197g and 2003 coincides with that of the U.S. in the 1910s and 1920s. Lessons from LA's urban and transportation development should be suggestive to China's urban and transportation planning.展开更多
Objective:The aim of this study was evaluate the diagnostic value of computed tomography(CT) perfusion in breast cancer by the method of receiver operator characteristic curve(ROC) analysis.Methods:Eighty-one cases wi...Objective:The aim of this study was evaluate the diagnostic value of computed tomography(CT) perfusion in breast cancer by the method of receiver operator characteristic curve(ROC) analysis.Methods:Eighty-one cases with breast masses found by health examination or mammography were scanned by multi-slice spiral CT(MSCT) perfusion and hemodynamic parameters of blood flow(BF), mean transit time(MTT) and blood volume(BV) were calculated by deconvolution arithmetic.According to the pathologic results, two groups, benign and malignant were classified and statistical analysis were performed between them.The ROC characteristics of BF, MTT, BV were compared for each and the diagnostic value of the hemodynamic parameters were confirmed.Results:In the malignant group, BF was(0.735 ± 0.440) mL/min/mL, MTT was(22.771 ± 7.647) s and BV was 0.234 ± 0.082.In the benign group, BF was(0.466 ± 0.527) mL/min/mL, MTT was(26.712 ± 12.934) s and BV was 0.179 ± 0.117.There was a significant difference for BF and BV between the benign and malignant groups.When the hemodynamic parameters were used to discriminate the breast lesions, the area under the ROC curve(AUCROC) of BF was 0.832 ± 0.086, the maximum, while AUCROC of BV was 0.695 ± 0.092.There was no significant statistical difference between BF and BV.AUCROC of MTT was 0.473 ± 0.102, which was minimal.Since the threshold of BF was 0.381 mL/min/mL, the sensitivity was 82.3%, the specificity was 73.2%, the positive likelihood ratio(LR) was 3.071 and the negative LR was 0.242.The threshold of BV was 0.190 with sensitivity 73.3%, specificity 56.5%, positive likelihood ratio 1.685 and negative LR 0.473.Conclusion:BF and BV among CT hemodynamic parameters have certain diagnostic value in breast cancer, but BF or BV can not yet be single index to confirm or deny the diagnosis.展开更多
The grounded theory of qualitative methods was applied to researching the social integration of tourism la-bor migrants in the Jiuhua Mountain of Anhui Province, China. The research was conducted based on the in-depth...The grounded theory of qualitative methods was applied to researching the social integration of tourism la-bor migrants in the Jiuhua Mountain of Anhui Province, China. The research was conducted based on the in-depth in-terviewing of 15 samples, open-consultation and the analysis of secondhand data. The integration models of tourism labor migrants in the Jiuhua Mountain were formed through four processes including theoretic sampling, cod-ing-analysis, cross-tabulation and contextualization. The result shows that modes of production and life styles decide self-integration orientation of tourism labor migrants in the Jiuhua Mountain. Cultural differences are fundamental dis-similarity between tourism labor migrants and natives. There are three kinds of integration models including rapid, free and gradually advancing integration. The differences among different types of migrants’ integration models are re-markable. Taking the working integration as the abscissa and taking the life integration as the coordinate, an "S" model of integration matrix appears in the gradually advancing integration of intermediate and high administers from the working to the life which should be paid special attention to.展开更多
This article aims to analyze the so-called“starting point”when modern scientific and technological successes in China were in their infancy,and to provide the reader with insight on how various challenges were overc...This article aims to analyze the so-called“starting point”when modern scientific and technological successes in China were in their infancy,and to provide the reader with insight on how various challenges were overcome in their development.The period under review is 1949–1955.The information about this period was obtained from Soviet archives and special literature.The first part of the article describes the state of affairs in the People’s Republic of China(PRC)in the early years of its formation,focusing on education,science,industry(including military),communications,and rail transport.The second part turns to the Soviet specialists working in the PRC during these years,focusing on their profession,number,cities of residence and living conditions.Issues regarding Chinese specialists’internship in the Union of Soviet Socialist Republics(USSR)are also touched upon.The article selects several lesserknown areas in which professional competencies were established in this very weak post-war country to discover the origins of the most important science and technology in the contemporary PRC,thereby contributing to readers’understanding of the initial conditions for the development of science and technology in China.展开更多
In the new historical period, China needs to show the nation's values and national spirit. With the advent of the era of globalization, the strength of a country is not only reflected in the economy, cultural factors...In the new historical period, China needs to show the nation's values and national spirit. With the advent of the era of globalization, the strength of a country is not only reflected in the economy, cultural factors will play an increasingly important role in the social development process in 2 lth century. The impact of cultural soft power and communication is essential for a country to power. In the process of going to the world, and in line with the international community, the Chinese culture will inevitably have a dialogue with the West. China will catch up with the world's advanced level. We must pay attention to enhance the competitiveness of culture and penetration. The paper analyzes the historical and present Chinese culture oversea transmission and the effects of the transmissions. The paper has three parts---the first part is the history of Chinese culture transmission; the second part is the present Chinese transmission; and the third part is the effects of Chinese culture transmission.展开更多
Education is rejuvenating the country, education is the talent in the country and rejuvenating the beginning. Popularization of higher education is thc ultimate goal in the development of the national education levcl,...Education is rejuvenating the country, education is the talent in the country and rejuvenating the beginning. Popularization of higher education is thc ultimate goal in the development of the national education levcl, to enhance the knowledge of the entire Chinese nation, the quality level is important. In recent years, the university has gone through college enrollment, fee system reform policy changes, the gross enrollment rate is 40% in 2015, exceeding the average level of middle income countries, is a big step forward on education in China. Along with the change in universities, the proportion of poor students has been expanded, and therefore the state has increased concern about the poor students in colleges and univcrsities. To prevent students drop out of school because of family difficulties, the use of government scholarships, grants in thc form of direct or indirect funding for poor students in colleges and universities. However, many problems still arise in College student poverty measures to implement the process, such as a lack of material poverty Branch precision, "the material poverty, spiritual poverty of light", the students lack credibility, etc. These problems lead to the expected results of poverty alleviation has not really achieved. This article will be poor college students, the poor student's current development summarized and analyzed from multiple levels of student poverty problems generated in the process.展开更多
The traditional Chinese martial arts are the pride of the Chinese national specialties, but with the development of the western modem combat, some traditional martial arts bias appeared, such as the argument of the re...The traditional Chinese martial arts are the pride of the Chinese national specialties, but with the development of the western modem combat, some traditional martial arts bias appeared, such as the argument of the real fight of the traditional martial arts. This paper starts from the traditional historical origin, and analyzes the actual combat possibility of traditional martial arts to study the feasibility of the actual combat application of the traditional martial arts techniques in modem combat challenge.展开更多
The Berne Convention plays a very important role in the protection of the copyright in its member states. Good Chinese translation for the Berne Convention will undoubtedly improve the implementation of it in China. O...The Berne Convention plays a very important role in the protection of the copyright in its member states. Good Chinese translation for the Berne Convention will undoubtedly improve the implementation of it in China. One of the key factors that affect the translation of the Berne Convention is the translation for the modal verbs, because they are concerning the rights conferred to or obligations imposed on authors or countries of the Union. Based on the statistics of the modal verbs used in the Berne Convention, this paper discovers that "shall" and "may" are the most frequently used modal verbs among the ones in English language and they are translated into many types of phrases in Chinese, but not all of them are accurate or appropriate, because the expressions used in the Copyright Law of the People's Republic of China to indicate rights, obligations or prohibitions are not all those that "shall" or "may" are translated into. Some suggestions can be put forward to improve the current Chinese translation for "shall" or "may" in the Berne Convention.展开更多
Established during the long years of revolutionary struggle and the founding of the People's Republic of China (PRC), the Communist Party of China(CPC)-led decision-making system has a historical rationality. Bef...Established during the long years of revolutionary struggle and the founding of the People's Republic of China (PRC), the Communist Party of China(CPC)-led decision-making system has a historical rationality. Before China's reform and opening-up was implemented in 1978, the decision-making system highlighted centralization which led to disadvantages such as non-existent specialized division of functions, a low level of institutionalization, heavy reliance on experience, an enclosed decision-making mode and non-existent self-correction mechanisms. These disadvantages were institutional factors which ultimately caused the historic tragedy of " Cultural Revolution. "After the reform and opening-up, the decision-making structure, mode and mechanism were reformed in order to promote scientific, democratic and law-based decisions. History has shown that the reform has successfully overcome various challenges brought about by China's rapidly changing economy and society. From the perspective of political development, the reform has promoted several transitions: from individual controlled decision-making system to a more democratic decision-making process, from being empirical to scientifically-based, from highly centralized decision-making organizations to decentralized one, from an enclosed mode to an open mode, from passive to active participation in the decision-making process and from a non-institutionalized to an institutionalized system. Therefore, the CPC-led open decision-making model based on science and laws and participated by other parties has taken an initial shape.展开更多
Long span ultra-high voltage(UHV) transmission lines have serious aeolian vibration problems. To control these vibrations,we improved the energy balance method in the following aspects:the wind power input,the conduct...Long span ultra-high voltage(UHV) transmission lines have serious aeolian vibration problems. To control these vibrations,we improved the energy balance method in the following aspects:the wind power input,the conductor self-damping,and the damper dissipated power. Meanwhile,we built a theoretical mechanical model of β wire dampers and derived energy dissipation calculation formulae. This permits the vibration energy dissipated by β wire dampers can be considered in the energy balance method. Then,we developed a computer program based on the improved energy balance method using Matlab,and analyzed UHV long span ground wires of the Han River long span project in P. R. China. The results show that the combination of β wire dampers and Stockbridge dampers can reduce vibration of UHV long span transmission lines,which provides a reference for research and construction of UHV engineering projects.展开更多
基金Funded by the Natural Science Foundation of China (No. 59778021)
文摘An effective approach for describing complicated water quality processes is very important for river water quality management. We built two artificial neural network(ANN) models,a feed-forward back-propagation(BP) model and a radial basis function(RBF) model,to simulate the water quality of the Yangtze and Jialing Rivers in reaches crossing the city of Chongqing,P. R. China. Our models used the historical monitoring data of biological oxygen demand,dissolved oxygen,ammonia,oil and volatile phenolic compounds. Comparison with the one-dimensional traditional water quality model suggest that both BP and RBF models are superior; their higher accuracy and better goodness-of-fit indicate that the ANN calculation of water quality agrees better with measurement. It is demonstrated that ANN modeling can be a tool for estimating the water quality of the Yangtze River. Of the two ANN models,the RBF model calculates with a smaller mean error,but a larger root mean square error. More effort to identify out the causes of these differences would help optimize the structures of neural network water-quality models.
文摘Preventing the propagation of methane or coal dust explosions through the use of active explosion-suppression systems remains one of the most underutilised explosion controls in underground coal mines. As part of the effort to develop better technologies to safeguard mines, the use of active barrier systems was investigated at Kloppersbos in South Africa. The system is designed to meet the requirements of the European Standard (EN 14591-4 2007) as well as the Mine Safety Standardisation in the Ministry of Coal Industry, Coal Industrial 1 Standard of the Peoples Republic of China (MT 694-1997). From the tests conducted, it can be concluded that the ExploSpot System was successful in stopping flame propagation for both methane and methane and coal dust hybrid explosions when ammonium phosphate powder was used as the suppression material. The use of this barrier will provide coal mine management with an additional explosion control close to the point of ignition and may find application within longwall faces further protecting mines against the risk of an explosion propagating throughout a mine.
文摘62 patients with chronic colitis were randomly divided into two groups. Acupuncture and moxibustion at acupoints such as Tianshu (St 25), Guanyuan (Ren 4) were applied in the treatment group, and western drugs were applied in the control group. The results showed that acupuncture and moxibustion had a marked curative effective with few side effects, and therefore was readily acceptable to the patients.
基金supported by the National Natural Science Foundation of China (Grant No.41301215)the Natural Science Foundation of Jiangsu Province,China (Grant No.BK20131058)+1 种基金the National Basic Research Program of China(Grant No.2012CB956100)the International Atomic Energy Agency (RC-19018)
文摘Ombrotrophic bogs are faithful archive of atmospheric metal deposition, but the potential for fens to reconstruct environmental change is often underestimated. In this study, some new data on the Pb depositional history in northeast China were provided using two ^210Pb-dated peat sequences from a poor fen in the Fenghuang Mountain of Heilongjiang province. Anthropogenic, detritic and atmospheric soil sources were discriminated using a two-step sequential digestion (weak acid leaching to liberate mobile Pb which is often regarded as anthropogenic Pb, especially for recent samples) and a ratio of unsupported ^210Pb and supported ^210Pb with the logic of that the ^214Pb mainly represents the residual detritus (constant throughout the core) and the unsupported ^210Pb arises from atmospheric fallout. A higher ^210Pb/^214Pb suggests more contributions from atmospheric deposition to the Pb content in the peat, and a ratio of 10 was defined to indicate the boundary between detrific input and atmospheric deposition. The detritic Pb was estimated to be 10-13 mg·kg^-1, the anthropogenic Pb ranged from 10-80 mg·kg^-1, and the atmospheric soil-derived Pb ranged from 〈 5 mg·kg^-1 to 30 mg·kg^-1. The history of anthropogenic Pb pollution over the last 150 years was reconstructed, and the calculated Pb deposition rate (AR Pb) ranged from 5 to 56 mg·m^-2·yr^-1. Using Ti as a reliable reference, the enrichment factor of Pb (EF Pb) relative to the upper continental crust was calculated. Both AR Pb and EF Pb increased with time, especially after the foundation of the People's Republic of China. This is consistent with increasing industrialization and coal burning in the last 60 years in northeast China. The present record of anthropogenic Pb deposition was consistent with the previous reports and an increasing trend of environmental pollution due to anthropogenic activities, in contrasts to Europe and North America which have experienced a major environmental cleanup. For the first time, this work estimates atmospheric Pb deposition via a minerotrophic peat core in China. This will enhance the use of peat archives for studies of environmental change.
文摘This paper contrasts Military Power of the People's Republic of China from the year of 2000 to 2009 and Military and Security Developments Involving People's Republic of China from the year 2010 to 2013 with corpus analysis. It distinguishes the new reports' differences from the old ones and tries to explore American's discourse colonization and discourse hegemony through corpus software WordSmith 5.0-Keywords and Concordance analysis of high frequency words. The significance of the study is that it enlightens military texts which will influence audiences' viewpoints and provides a new perspective for strategies replying American media war.
基金This study was supported by National Science Foundation Council of China (No.81700383), Jilin Provincial Industrial Innovation Special Fund Project (No.2016C041), Beijing Natural Science Foundation of China (8152019), Beijing Municipal Science and Technology of Chinese Medicine Development Funds Youth Research Project (No. QN2016-20), and Basic-Clinical Scientific Research Cooperation of Capital Medical University fund (No.17JL72). The authors declare no conflict of interest.
文摘Objective To investigate the impact of meteorological conditions and PM2.5 on the onset of acute aortic dissection in monsoonal climate. Methods A linear regression analysis was performed in monsoonal climate epidemiological survey for a period of four years on the impact of meteorological factors (minimal temperature, mean temperature, maximal temperature, average daily surface temperature, day temperature range, relative humidity, mean wind speed, and atmospheric pressure) and PM2.5 concentration on the daily incidences of acute aortic dissections. Meteorological variables and PM2.5 concentration were retrieved on a daily basis from Beijing Regional Climate Center and the Ministry of Environmental Protection of the People’s Republic of China’s website, and the daily incidences of acute aortic dissections were retrieved from the Clinical Data Analysis and Reporting System in the Emergency and Critical Care Center of Beijing Anzhen Hospital. Results During the study period (from January 2011 to December 2014), 1164 patients were identified as having acute aortic dissections. The corresponding incidences in spring and autumn were 0.96 and 1.00, respectively, which significantly higher than that in summer and winter. The incidences of acute aortic dissection in a day could be predicted by diurnal temperature range (DTR) using the following linear multiple regression models: incidences of acute aortic dissection = 0.543 + 0.025 × DTR. Conclusion This is the first study to show an attributable effect of DTR on acute aortic events in monsoonal climate. Our study confirms that meteorological variables were important factors influencing the incidence of acute aortic dissection.
文摘According to the regulations of the People's Republic of China national standard as the basis, on the part of chemical industry product quality inspection and analysis of the implementation of computer management has developed a set of software applications, the software in chemical products quality inspection and analysis of the means of management is an innovation. The software functions, can automatically process data, judge the product grade, quality analysis, objective and fair, convenient, fast, accurate, stable, practical, and easy to popularize.
基金Funded by the R & D Project of the Ministry of Construction of China.
文摘This paper describes a structural equation modeling (SEM) analysis of factors influencing architects' trust in project design teams. We undertook a survey of architects, during which we distributed 193 questionnaires in 29 A-level architectural design institutes selected radomly from the altogether 59 ones in Shenzhen, P. R. China, and received 130 valid questionnaires. We used Amos 6.0 for SEM to identify significant personal construct based factors affecting interpersonal trust. The results show that only social interaction between architects significantly affects their interpersonal trust. The explained variance of trus~ is not very high in the model. Therefore, future research should add more factors into the current model. The practical implication is that team managers should promote the social interactions between team members such that the interpersonal trust level between team members can be improved.
基金Funded by Key Project of the Natural Science Foundation of China under the grant No. 40635026.
文摘As a typical car-dependent city, Los Angeles (LA) is extensively used as an example in research to illustrate car influences on city form. Focusing on the features of LA's geologic conditions and civil circumstances, we argued that the relationship between LA's low-density pattern and car dependence is more involved than previously deemed simple causality. The low density should be primarily credited to the spacious requirement of the mining industry, frequent earthquakes and multiethnic population of the city. Off reserves in LA fueled its economic boom and fast urbanization that coincided with the start of mass production of cheap cars, and cars became medium-priced consumables for average families. Politicians preference for short constrnction-period projects enabled fast establishment of LA's highway infrastructure. The popularity of car use in return faciliatated further development of the low-density pattern of the city. The low-density urban form and car dependence created environmental and social problems for LA. Looking at P. R. China's motorization and urban development, we found that the trajectory of Beijing's motorization between 197g and 2003 coincides with that of the U.S. in the 1910s and 1920s. Lessons from LA's urban and transportation development should be suggestive to China's urban and transportation planning.
文摘Objective:The aim of this study was evaluate the diagnostic value of computed tomography(CT) perfusion in breast cancer by the method of receiver operator characteristic curve(ROC) analysis.Methods:Eighty-one cases with breast masses found by health examination or mammography were scanned by multi-slice spiral CT(MSCT) perfusion and hemodynamic parameters of blood flow(BF), mean transit time(MTT) and blood volume(BV) were calculated by deconvolution arithmetic.According to the pathologic results, two groups, benign and malignant were classified and statistical analysis were performed between them.The ROC characteristics of BF, MTT, BV were compared for each and the diagnostic value of the hemodynamic parameters were confirmed.Results:In the malignant group, BF was(0.735 ± 0.440) mL/min/mL, MTT was(22.771 ± 7.647) s and BV was 0.234 ± 0.082.In the benign group, BF was(0.466 ± 0.527) mL/min/mL, MTT was(26.712 ± 12.934) s and BV was 0.179 ± 0.117.There was a significant difference for BF and BV between the benign and malignant groups.When the hemodynamic parameters were used to discriminate the breast lesions, the area under the ROC curve(AUCROC) of BF was 0.832 ± 0.086, the maximum, while AUCROC of BV was 0.695 ± 0.092.There was no significant statistical difference between BF and BV.AUCROC of MTT was 0.473 ± 0.102, which was minimal.Since the threshold of BF was 0.381 mL/min/mL, the sensitivity was 82.3%, the specificity was 73.2%, the positive likelihood ratio(LR) was 3.071 and the negative LR was 0.242.The threshold of BV was 0.190 with sensitivity 73.3%, specificity 56.5%, positive likelihood ratio 1.685 and negative LR 0.473.Conclusion:BF and BV among CT hemodynamic parameters have certain diagnostic value in breast cancer, but BF or BV can not yet be single index to confirm or deny the diagnosis.
基金Under the auspices of the Social Science Foundation of China (No. 40771059)Project of Key Research Institute of Humanities and Social Science of Anhui Provincial Education Department (No. 2008sk082rd)
文摘The grounded theory of qualitative methods was applied to researching the social integration of tourism la-bor migrants in the Jiuhua Mountain of Anhui Province, China. The research was conducted based on the in-depth in-terviewing of 15 samples, open-consultation and the analysis of secondhand data. The integration models of tourism labor migrants in the Jiuhua Mountain were formed through four processes including theoretic sampling, cod-ing-analysis, cross-tabulation and contextualization. The result shows that modes of production and life styles decide self-integration orientation of tourism labor migrants in the Jiuhua Mountain. Cultural differences are fundamental dis-similarity between tourism labor migrants and natives. There are three kinds of integration models including rapid, free and gradually advancing integration. The differences among different types of migrants’ integration models are re-markable. Taking the working integration as the abscissa and taking the life integration as the coordinate, an "S" model of integration matrix appears in the gradually advancing integration of intermediate and high administers from the working to the life which should be paid special attention to.
文摘This article aims to analyze the so-called“starting point”when modern scientific and technological successes in China were in their infancy,and to provide the reader with insight on how various challenges were overcome in their development.The period under review is 1949–1955.The information about this period was obtained from Soviet archives and special literature.The first part of the article describes the state of affairs in the People’s Republic of China(PRC)in the early years of its formation,focusing on education,science,industry(including military),communications,and rail transport.The second part turns to the Soviet specialists working in the PRC during these years,focusing on their profession,number,cities of residence and living conditions.Issues regarding Chinese specialists’internship in the Union of Soviet Socialist Republics(USSR)are also touched upon.The article selects several lesserknown areas in which professional competencies were established in this very weak post-war country to discover the origins of the most important science and technology in the contemporary PRC,thereby contributing to readers’understanding of the initial conditions for the development of science and technology in China.
文摘In the new historical period, China needs to show the nation's values and national spirit. With the advent of the era of globalization, the strength of a country is not only reflected in the economy, cultural factors will play an increasingly important role in the social development process in 2 lth century. The impact of cultural soft power and communication is essential for a country to power. In the process of going to the world, and in line with the international community, the Chinese culture will inevitably have a dialogue with the West. China will catch up with the world's advanced level. We must pay attention to enhance the competitiveness of culture and penetration. The paper analyzes the historical and present Chinese culture oversea transmission and the effects of the transmissions. The paper has three parts---the first part is the history of Chinese culture transmission; the second part is the present Chinese transmission; and the third part is the effects of Chinese culture transmission.
文摘Education is rejuvenating the country, education is the talent in the country and rejuvenating the beginning. Popularization of higher education is thc ultimate goal in the development of the national education levcl, to enhance the knowledge of the entire Chinese nation, the quality level is important. In recent years, the university has gone through college enrollment, fee system reform policy changes, the gross enrollment rate is 40% in 2015, exceeding the average level of middle income countries, is a big step forward on education in China. Along with the change in universities, the proportion of poor students has been expanded, and therefore the state has increased concern about the poor students in colleges and univcrsities. To prevent students drop out of school because of family difficulties, the use of government scholarships, grants in thc form of direct or indirect funding for poor students in colleges and universities. However, many problems still arise in College student poverty measures to implement the process, such as a lack of material poverty Branch precision, "the material poverty, spiritual poverty of light", the students lack credibility, etc. These problems lead to the expected results of poverty alleviation has not really achieved. This article will be poor college students, the poor student's current development summarized and analyzed from multiple levels of student poverty problems generated in the process.
文摘The traditional Chinese martial arts are the pride of the Chinese national specialties, but with the development of the western modem combat, some traditional martial arts bias appeared, such as the argument of the real fight of the traditional martial arts. This paper starts from the traditional historical origin, and analyzes the actual combat possibility of traditional martial arts to study the feasibility of the actual combat application of the traditional martial arts techniques in modem combat challenge.
文摘The Berne Convention plays a very important role in the protection of the copyright in its member states. Good Chinese translation for the Berne Convention will undoubtedly improve the implementation of it in China. One of the key factors that affect the translation of the Berne Convention is the translation for the modal verbs, because they are concerning the rights conferred to or obligations imposed on authors or countries of the Union. Based on the statistics of the modal verbs used in the Berne Convention, this paper discovers that "shall" and "may" are the most frequently used modal verbs among the ones in English language and they are translated into many types of phrases in Chinese, but not all of them are accurate or appropriate, because the expressions used in the Copyright Law of the People's Republic of China to indicate rights, obligations or prohibitions are not all those that "shall" or "may" are translated into. Some suggestions can be put forward to improve the current Chinese translation for "shall" or "may" in the Berne Convention.
文摘Established during the long years of revolutionary struggle and the founding of the People's Republic of China (PRC), the Communist Party of China(CPC)-led decision-making system has a historical rationality. Before China's reform and opening-up was implemented in 1978, the decision-making system highlighted centralization which led to disadvantages such as non-existent specialized division of functions, a low level of institutionalization, heavy reliance on experience, an enclosed decision-making mode and non-existent self-correction mechanisms. These disadvantages were institutional factors which ultimately caused the historic tragedy of " Cultural Revolution. "After the reform and opening-up, the decision-making structure, mode and mechanism were reformed in order to promote scientific, democratic and law-based decisions. History has shown that the reform has successfully overcome various challenges brought about by China's rapidly changing economy and society. From the perspective of political development, the reform has promoted several transitions: from individual controlled decision-making system to a more democratic decision-making process, from being empirical to scientifically-based, from highly centralized decision-making organizations to decentralized one, from an enclosed mode to an open mode, from passive to active participation in the decision-making process and from a non-institutionalized to an institutionalized system. Therefore, the CPC-led open decision-making model based on science and laws and participated by other parties has taken an initial shape.
基金Funded by the Natural Science Foundation of China (No. 50878093).
文摘Long span ultra-high voltage(UHV) transmission lines have serious aeolian vibration problems. To control these vibrations,we improved the energy balance method in the following aspects:the wind power input,the conductor self-damping,and the damper dissipated power. Meanwhile,we built a theoretical mechanical model of β wire dampers and derived energy dissipation calculation formulae. This permits the vibration energy dissipated by β wire dampers can be considered in the energy balance method. Then,we developed a computer program based on the improved energy balance method using Matlab,and analyzed UHV long span ground wires of the Han River long span project in P. R. China. The results show that the combination of β wire dampers and Stockbridge dampers can reduce vibration of UHV long span transmission lines,which provides a reference for research and construction of UHV engineering projects.