There are a lot of methods in city water consumption short-term forecasting both inside and outside the country. But among these methods there exist many advantages and shortcomings in model establishing, solving and ...There are a lot of methods in city water consumption short-term forecasting both inside and outside the country. But among these methods there exist many advantages and shortcomings in model establishing, solving and predicting accuracy, speed, applicability. This article draws lessons from other realm mature methods after many years′ study. It′s systematically studied and compared to predict the water consumption in accuracy, speed, effect and applicability among the time series triangle function method, artificial neural network method, gray system theories method, wavelet analytical method.展开更多
In this paper, we present a fuzzy linguistic scale, which is characterized by triangular fuzzy numbers on [1/9, 9], for the comparison between two alternatives, and introduce a possibility degree formula for comparing...In this paper, we present a fuzzy linguistic scale, which is characterized by triangular fuzzy numbers on [1/9, 9], for the comparison between two alternatives, and introduce a possibility degree formula for comparing triangular fuzzy numbers. We utilize the fuzzy linguistic scale to construct a linguistic preference matrix, and propose a fuzzy induced ordered weighted geometric averaging (FIOWGA) operator to aggregate linguistic preference information. A method based on the fuzzy linguistic scale and FIOWGA operator for decision-making problems is presented. Finally, an illustrative example is given to verify the developed method and to demonstrate its feasibility and effectiveness.展开更多
In order to study the calculation methods of bending behavior of Chinese reinforced concrete beams from 1912 to 1949, tests on the mechanical performance of 66 rebars from different modem Chinese concrete buildings, t...In order to study the calculation methods of bending behavior of Chinese reinforced concrete beams from 1912 to 1949, tests on the mechanical performance of 66 rebars from different modem Chinese concrete buildings, the concrete compressive strength of 12 modem Chinese concrete buildings, and the concrete cover thickness of 9 modem Chinese concrete buildings are carried out; and the actual material properties and structural conformations of modem Chinese concrete buildings are obtained. Then, the comparison on calculation methods of bending behavior including the original Chinese calculation method, the present Chinese calculation method, the present American calculation method and the present European calculation method is studied. The results show that the original Chinese calculation method of bending behavior is based on the allowable stress calculation method, and the design safety factors are 3.55 to 4. 0. In term of the calculation area of longitudinal rebars of reinforced concrete beams, without considering earthquake action, the original Chinese structural calculation method is safer than the present Chinese structural calculation method, the present European structural calculation method, and the present American structural calculation method. The results can provide support for the structural safety assessments of modem Chinese reinforced concrete buildings.展开更多
A comparison of arithmetic operations of two dynamic process optimization approaches called quasi-sequential approach and reduced Sequential Quadratic Programming(rSQP)simultaneous approach with respect to equality co...A comparison of arithmetic operations of two dynamic process optimization approaches called quasi-sequential approach and reduced Sequential Quadratic Programming(rSQP)simultaneous approach with respect to equality constrained optimization problems is presented.Through the detail comparison of arithmetic operations,it is concluded that the average iteration number within differential algebraic equations(DAEs)integration of quasi-sequential approach could be regarded as a criterion.One formula is given to calculate the threshold value of average iteration number.If the average iteration number is less than the threshold value,quasi-sequential approach takes advantage of rSQP simultaneous approach which is more suitable contrarily.Two optimal control problems are given to demonstrate the usage of threshold value.For optimal control problems whose objective is to stay near desired operating point,the iteration number is usually small.Therefore,quasi-sequential approach seems more suitable for such problems.展开更多
With the income increase of elderly people in Beijing and the improvement of leisure facilities since 2000, the quality of elderly people leisure life in Beijing has obviously increased com- pared to ten years ago. Ac...With the income increase of elderly people in Beijing and the improvement of leisure facilities since 2000, the quality of elderly people leisure life in Beijing has obviously increased com- pared to ten years ago. According to the investigation and com- parative analysis on more than 900 elderly people, who usually exercise in public parks in Beijing City, we have found out several new features of elderly people's outdoor recreation in Belting: the increase of the leisure time, the expansion of leisure space, the in- dividuation of interest and the diversification of consumption. The leisure life quality evaluation index system of urban elderly people can be built based on these analyses. In order to accommodate the development tendency of elderly people's demand for leisure diversification, we should strengthen the organization and manage- ment of elderly people's leisure activity in urban construction, and pay more attention to function complementation between commu- nities and parks.展开更多
The article is structured around a premise of intertextuality, which is suggested not only by McCarthy's own more or less overt allusions to Faulkner's writing but also by the very name of his protagonist Suttree, w...The article is structured around a premise of intertextuality, which is suggested not only by McCarthy's own more or less overt allusions to Faulkner's writing but also by the very name of his protagonist Suttree, which is evocative of the name of perhaps the best known Faulkner villain Thomas Sutpen. This supposition in turn leads to an argument that in his 1979 novel McCarthy does indeed reverse the life story of Thomas Sutpen by making Suttree descend down the very path that Sutpen ascended a century and a half before him, i.e., from the ranks of Southern aristocracy to the scum of the earth, and in defiance of the same ideology that Sutpen went to great lengths to embrace. Thus, an intertextual and comparative approach to McCarthy's novel not only in the context of Faulkner's Absalom, Absalom! but also his Light in August (cf. Joe Christmas) and The Sound and the Fury (cf. Quentin) as well as Ellen Glasgow's short story "Jordan's End" demonstrates that what Cormac McCarthy actually does in Suttree is to demythologize the South, complete with its aristocratic pretensions ("doing pretty"), dubious morality (incest) and fear of miscegenation (obsession with time and the double). Moreover, in doing so, he defamiliarizes it by reducing it to its Other (poor whites and African Americans), whose authenticity, liveliness and charitability defy the affectation, lifelessness and decadence of the aristocratic South.展开更多
In order to pursue the ideal criterion of "faithfulness, expressiveness, and elegance" initiated by the famous translator YAN-fu in translation and "accuracy, smoothness, and quickness" in interpretation in China,...In order to pursue the ideal criterion of "faithfulness, expressiveness, and elegance" initiated by the famous translator YAN-fu in translation and "accuracy, smoothness, and quickness" in interpretation in China, people have summarized some techniques to help the process. And generally speaking, trainers or teachers will introduce those techniques to the students respectively. Yet in this paper firstly, by taking examples from some of the text books and a few famous conferences in China, it makes a comparative analysis of the different techniques in translation and interpretation. The comparative analysis explores the most three common techniques: amplification, omission, and repetition in translation and interpretation, and draws the conclusion that translation is more formal, more rigorous, while interpretation is comparetively simple and flexiable. Based on the above analysis, then the paper suggests that the comparative analysis approaches should be used during the teaching process instead of the traditional one-way teaching.展开更多
In contrast with the large number of theatrical performances and filmic versions for television, both British and American, based on the play The Importance of Being Earnest (1975) by Oscar Wilde, there have only be...In contrast with the large number of theatrical performances and filmic versions for television, both British and American, based on the play The Importance of Being Earnest (1975) by Oscar Wilde, there have only been, so far, three films made for the cinema. Although one of them was made in the United States by the American director Kurt Baker in 1992, this paper will address only the two English versions, chronologically separated by a 50-year time span. It will focus on the cinematic adaptations made by English directors Anthony Asquith and Oliver Parker, the former in 1952 and the latter in 2002. Based on the same play, this comparative approach may throw some light on the evolution of cinematographic conditions and techniques as well as relate them to the expectations of audiences in the mid 20th century and at the beginning of the 21st century.展开更多
The foundational and survival principles of all religions are shrouded in rituals, narratives, origin-stories, cultic practices, casuistries, taboos, mythical figures and institutions of authority. However, through ou...The foundational and survival principles of all religions are shrouded in rituals, narratives, origin-stories, cultic practices, casuistries, taboos, mythical figures and institutions of authority. However, through out history, religions have been threatened by politico-military and religious aggressions from other peoples, by heterodoxies, alternative origin-stories, practices and beliefs. These threats became unprecedented with the advent of Modernity. Faced with these destabilizing agents, they resorted to citing textual authorities, strengthening their institutions, giving leaders more powers, precisely defining belief commitments, punishing heretics and using violence against heterodoxies. Consequently, in their obsessive quest for preserving the sanctity of their faiths against modern threats, religions or section of a religion adopted both revival and resistant measures. Fundamentalism thus developed within these contexts. This paper intends to reveal that religious militancy and militarism are ramifications of Fundamentalism. It argues that Modernity's destabilizing agents to religions and religions' passionate desire for self-protective steps, militant or militaristic, yield to the phenomenon of Fundamentalism. Secondary sources were used to assemble the data while analytical and comparative approaches with empirical emphases on Christianity and Islam were used to weave the findings with the finality that militant or militaristic, Fundamentalism is religions' obsessive response to Modernity,展开更多
Animal models provide myriad benefits to both experimental and clinical research. Unfortunately, in many situations, they fall short of expected results or provide contradictory results. In part, this can be the resul...Animal models provide myriad benefits to both experimental and clinical research. Unfortunately, in many situations, they fall short of expected results or provide contradictory results. In part, this can be the result of traditional molecular biological approaches that are relatively inefficient in elucidating underlying molecular mechanism. To improve the efficacy of animal models, a technological breakthrough is required. The growing availability and application of the high-throughput methods make systematic comparisons between human and animal models easier to perform. In the present study, we introduce the concept of the comparative systems biology, which we define as "comparisons of biological systems in different states or species used to achieve an integrated understanding of life forms with all their characteristic complexity of interactions at multiple levels". Furthermore, we discuss the applications of RNA-seq and ChIP-seq technologies to comparative systems biology between human and animal models and assess the potential applications for this approach in the future studies.展开更多
The scores of grape wine given by wine critics have differences, therefore, for which its credibility differs. Firstly, our paper analysis differences of overall and individual for the two groups of raters. The analys...The scores of grape wine given by wine critics have differences, therefore, for which its credibility differs. Firstly, our paper analysis differences of overall and individual for the two groups of raters. The analysis method is: first check the score whether meets the normal distribution or not by Chi-square and then test whether the mean of the two group's ratings is equal or not, through t-test, to illustrate the differences of the two groups' ratings. Secondly this paper respectively characterizes the credibility of each group's rating with the variance and gray correlation. Both the results are highly consistent on the credibility, so they can support each other. This score comparison method can be further extended to a similar scoring system.展开更多
Aiming at characteristics of underground engineering,analyzed the feasibility of Multidisciplinary Design Optimization (MDO) used in underground engineering,and put forward a modularization-based MDO method and the id...Aiming at characteristics of underground engineering,analyzed the feasibility of Multidisciplinary Design Optimization (MDO) used in underground engineering,and put forward a modularization-based MDO method and the idea of MDO to resolve problems in stability analysis,proving the validity and feasibility of using MDO in underground engi- neering.Characteristics of uncertainty,complexity and nonlinear become bottle-neck to carry on underground engineering stability analysis by MDO.Therefore,the application of MDO in underground engineering stability analysis is still at a stage of exploration,which need some deep research.展开更多
Accurate parameter identification is essential when designing controllers for inertially stabilized platforms (lSPs). But traditional identification methods suffer from observation measurement noise and operating re...Accurate parameter identification is essential when designing controllers for inertially stabilized platforms (lSPs). But traditional identification methods suffer from observation measurement noise and operating restrictions of ISPs. To address this issue, a novel identification method based on current command design and multilevel coordinate search (MCS) algorithm without any higher order measurement differentiations was proposed. The designed current commands were adopted to obtain parameter decoupled models with the platform operating under allowable conditions. MCS algorithm was employed to estimate the parameters based on parameter decoupled models. A comparison experiment between the proposed method and non-linear least square method was carried out and most of the relative errors of identified parameters obtained by the proposed method were below 10%. Simulation and experiment based on identified parameters were conducted. A velocity control structure was also developed with disturbance observer (DOB) for application in disturbance compensation control system of an ISR Experimental results show that the control scheme based on the identified parameters with DOB has the best disturbance rejection performance. It reduces the peak to peak value (PPV) of velocity error integral to 0.8 mrad which is much smaller than the value (10 mrad) obtained by the single velocity controller without DOB. Compared with the control scheme based on sweep model with DOB compensation, the proposed control scheme improves the PPV of velocity error integral by 1.625 times.展开更多
In this paper, the function characteristics of instruction are introduced, and the focus is on contact compare instruction and the characteristics of the transfer instructions. With the traffic lights control as an ex...In this paper, the function characteristics of instruction are introduced, and the focus is on contact compare instruction and the characteristics of the transfer instructions. With the traffic lights control as an example, this paper proposes the application of contact compare instruction and transfer instruction to program design method, making the program structure compact and statement concise. The control requirements are easily completed. Key words: Function Instruction; Programming; Traffic Lights; Contact Compare Instruction; Transfer展开更多
Terrestrial arthropods are extremely important ecosystem components. The choice of best approaches to collect the wide range of terrestrial arthropods has been a topic of long-lasting debates. This article provides a ...Terrestrial arthropods are extremely important ecosystem components. The choice of best approaches to collect the wide range of terrestrial arthropods has been a topic of long-lasting debates. This article provides a brief overview of common sampling methods for terrestrial arthropod assemblages. We divide sampling methods into three main categories: passive sampling methods without any "activity density" bias, passive sampling methods with an "activity density" bias, and active sampling methods with inherent "activity density" and often further species-dependent biases, discussing their individual advantages and shortcomings as basis for biodiversity studies and pest control management. The selection of the optimal sampling methods depends strongly on the purpose of individual studies and the ecology and behavior of the arthropod groups targeted. A combination of different suitable methods is highly recommended in many cases.展开更多
As complex traits evolve, each component of the trait may be under different selection pressures and could respond independently to distinct evolutionary forces. We used comparative methods to examine patterns of evol...As complex traits evolve, each component of the trait may be under different selection pressures and could respond independently to distinct evolutionary forces. We used comparative methods to examine patterns of evolution in multiple components of a complex courtship signal in darters, specifically addressing the question of how nuptial coloration evolves across different areas of the body. Using spectral reflectance, we defined 4 broad color classes present on the body and fins of 17 species of freshwater fishes (genus Etheostoma) and quantified differences in hue within each color class. Ancestral state reconstruction suggests that most color traits were expressed in the most recent common ancestor of sampled species and that differences among species are mostly due to losses in coloration. The evolutionary lability of coloration varied across body regions; we found sig- nificant phylogenetic signal for orange color on the body but not for most colors on fins. Finally, patterns of color evolution and hue Of the colors were correlated among the two dorsal fins and between the anterior dorsal and anal fins, but not between any of the fins and the body. The observed patterns support the hypothesis that different components of complex signals may be subject to distinct evolutionary pressures, and suggests that the combination of behavioral displays and morphology in communication may have a strong influence on patterns of signal evolution .展开更多
Objective:To explore the therapeutic methods, surgical indications and clinical practice of minimally invasive surgery on traumatic epidural hematoma(EDH). Methods:Retrospective study was made on 135 patients with tra...Objective:To explore the therapeutic methods, surgical indications and clinical practice of minimally invasive surgery on traumatic epidural hematoma(EDH). Methods:Retrospective study was made on 135 patients with traumatic EDH admitted into our hospital from June 2002 to August 2005.Sixty-five patients were treated with mini-invasive negative pressure drainage (treatment group),70 patients with comparable condition used traditional craniotomy(control group).The mean time of operation,average days in hospital,expenditure and prognosis of two groups were recorded and analyzed. Results:There was no significant difference in therapeutic efficacy between two groups.Patients in treatment group had a shorter hospital stay and less expenditure than those in control group. Conclusion:Mini-invasive negative pressure drainage is simple,effective,economical and applicable to some traumatic EDH patients.展开更多
Transient CFD simulations are performed to investigate the flow behaviour inside an unshrouded pump using the SAS method. Two blade designs are compared at two different tip clearances and the results are validated by...Transient CFD simulations are performed to investigate the flow behaviour inside an unshrouded pump using the SAS method. Two blade designs are compared at two different tip clearances and the results are validated by measurements. The detected vortex structure is visualized by the normalized helicity, further discussed regarding its development and behaviour and finally implicated to the efficiency of the two different blade designs.展开更多
文摘There are a lot of methods in city water consumption short-term forecasting both inside and outside the country. But among these methods there exist many advantages and shortcomings in model establishing, solving and predicting accuracy, speed, applicability. This article draws lessons from other realm mature methods after many years′ study. It′s systematically studied and compared to predict the water consumption in accuracy, speed, effect and applicability among the time series triangle function method, artificial neural network method, gray system theories method, wavelet analytical method.
基金The National Natural Science Foundation of China(79970093) the Ph.D. Dissertation Foundation of Southeast University- NARI-Relays Electric Co. Ltd.
文摘In this paper, we present a fuzzy linguistic scale, which is characterized by triangular fuzzy numbers on [1/9, 9], for the comparison between two alternatives, and introduce a possibility degree formula for comparing triangular fuzzy numbers. We utilize the fuzzy linguistic scale to construct a linguistic preference matrix, and propose a fuzzy induced ordered weighted geometric averaging (FIOWGA) operator to aggregate linguistic preference information. A method based on the fuzzy linguistic scale and FIOWGA operator for decision-making problems is presented. Finally, an illustrative example is given to verify the developed method and to demonstrate its feasibility and effectiveness.
基金The National Natural Science Foundation of China(No.51138002)the Foundation for the Author of National Excellent Doctoral Dissertation of PR China(No.201452)the Open Fund of Shanghai Key Laboratory of Engineering Structure Safety(No.2015-KF06)
文摘In order to study the calculation methods of bending behavior of Chinese reinforced concrete beams from 1912 to 1949, tests on the mechanical performance of 66 rebars from different modem Chinese concrete buildings, the concrete compressive strength of 12 modem Chinese concrete buildings, and the concrete cover thickness of 9 modem Chinese concrete buildings are carried out; and the actual material properties and structural conformations of modem Chinese concrete buildings are obtained. Then, the comparison on calculation methods of bending behavior including the original Chinese calculation method, the present Chinese calculation method, the present American calculation method and the present European calculation method is studied. The results show that the original Chinese calculation method of bending behavior is based on the allowable stress calculation method, and the design safety factors are 3.55 to 4. 0. In term of the calculation area of longitudinal rebars of reinforced concrete beams, without considering earthquake action, the original Chinese structural calculation method is safer than the present Chinese structural calculation method, the present European structural calculation method, and the present American structural calculation method. The results can provide support for the structural safety assessments of modem Chinese reinforced concrete buildings.
基金Supported by the National Natural Science Foundation of China(20676117) the National Creative Research Groups Science Foundation of China(60421002)
文摘A comparison of arithmetic operations of two dynamic process optimization approaches called quasi-sequential approach and reduced Sequential Quadratic Programming(rSQP)simultaneous approach with respect to equality constrained optimization problems is presented.Through the detail comparison of arithmetic operations,it is concluded that the average iteration number within differential algebraic equations(DAEs)integration of quasi-sequential approach could be regarded as a criterion.One formula is given to calculate the threshold value of average iteration number.If the average iteration number is less than the threshold value,quasi-sequential approach takes advantage of rSQP simultaneous approach which is more suitable contrarily.Two optimal control problems are given to demonstrate the usage of threshold value.For optimal control problems whose objective is to stay near desired operating point,the iteration number is usually small.Therefore,quasi-sequential approach seems more suitable for such problems.
基金support of Key Project of Chinese Ministry of Education (Grant No. 170170)
文摘With the income increase of elderly people in Beijing and the improvement of leisure facilities since 2000, the quality of elderly people leisure life in Beijing has obviously increased com- pared to ten years ago. According to the investigation and com- parative analysis on more than 900 elderly people, who usually exercise in public parks in Beijing City, we have found out several new features of elderly people's outdoor recreation in Belting: the increase of the leisure time, the expansion of leisure space, the in- dividuation of interest and the diversification of consumption. The leisure life quality evaluation index system of urban elderly people can be built based on these analyses. In order to accommodate the development tendency of elderly people's demand for leisure diversification, we should strengthen the organization and manage- ment of elderly people's leisure activity in urban construction, and pay more attention to function complementation between commu- nities and parks.
文摘The article is structured around a premise of intertextuality, which is suggested not only by McCarthy's own more or less overt allusions to Faulkner's writing but also by the very name of his protagonist Suttree, which is evocative of the name of perhaps the best known Faulkner villain Thomas Sutpen. This supposition in turn leads to an argument that in his 1979 novel McCarthy does indeed reverse the life story of Thomas Sutpen by making Suttree descend down the very path that Sutpen ascended a century and a half before him, i.e., from the ranks of Southern aristocracy to the scum of the earth, and in defiance of the same ideology that Sutpen went to great lengths to embrace. Thus, an intertextual and comparative approach to McCarthy's novel not only in the context of Faulkner's Absalom, Absalom! but also his Light in August (cf. Joe Christmas) and The Sound and the Fury (cf. Quentin) as well as Ellen Glasgow's short story "Jordan's End" demonstrates that what Cormac McCarthy actually does in Suttree is to demythologize the South, complete with its aristocratic pretensions ("doing pretty"), dubious morality (incest) and fear of miscegenation (obsession with time and the double). Moreover, in doing so, he defamiliarizes it by reducing it to its Other (poor whites and African Americans), whose authenticity, liveliness and charitability defy the affectation, lifelessness and decadence of the aristocratic South.
文摘In order to pursue the ideal criterion of "faithfulness, expressiveness, and elegance" initiated by the famous translator YAN-fu in translation and "accuracy, smoothness, and quickness" in interpretation in China, people have summarized some techniques to help the process. And generally speaking, trainers or teachers will introduce those techniques to the students respectively. Yet in this paper firstly, by taking examples from some of the text books and a few famous conferences in China, it makes a comparative analysis of the different techniques in translation and interpretation. The comparative analysis explores the most three common techniques: amplification, omission, and repetition in translation and interpretation, and draws the conclusion that translation is more formal, more rigorous, while interpretation is comparetively simple and flexiable. Based on the above analysis, then the paper suggests that the comparative analysis approaches should be used during the teaching process instead of the traditional one-way teaching.
文摘In contrast with the large number of theatrical performances and filmic versions for television, both British and American, based on the play The Importance of Being Earnest (1975) by Oscar Wilde, there have only been, so far, three films made for the cinema. Although one of them was made in the United States by the American director Kurt Baker in 1992, this paper will address only the two English versions, chronologically separated by a 50-year time span. It will focus on the cinematic adaptations made by English directors Anthony Asquith and Oliver Parker, the former in 1952 and the latter in 2002. Based on the same play, this comparative approach may throw some light on the evolution of cinematographic conditions and techniques as well as relate them to the expectations of audiences in the mid 20th century and at the beginning of the 21st century.
文摘The foundational and survival principles of all religions are shrouded in rituals, narratives, origin-stories, cultic practices, casuistries, taboos, mythical figures and institutions of authority. However, through out history, religions have been threatened by politico-military and religious aggressions from other peoples, by heterodoxies, alternative origin-stories, practices and beliefs. These threats became unprecedented with the advent of Modernity. Faced with these destabilizing agents, they resorted to citing textual authorities, strengthening their institutions, giving leaders more powers, precisely defining belief commitments, punishing heretics and using violence against heterodoxies. Consequently, in their obsessive quest for preserving the sanctity of their faiths against modern threats, religions or section of a religion adopted both revival and resistant measures. Fundamentalism thus developed within these contexts. This paper intends to reveal that religious militancy and militarism are ramifications of Fundamentalism. It argues that Modernity's destabilizing agents to religions and religions' passionate desire for self-protective steps, militant or militaristic, yield to the phenomenon of Fundamentalism. Secondary sources were used to assemble the data while analytical and comparative approaches with empirical emphases on Christianity and Islam were used to weave the findings with the finality that militant or militaristic, Fundamentalism is religions' obsessive response to Modernity,
基金supported by the National Natural Science Foundation of China (31123005)the Chinese Academy of Sciences (Y002731071)the National Basic Research Program of China (2009CB941300)
文摘Animal models provide myriad benefits to both experimental and clinical research. Unfortunately, in many situations, they fall short of expected results or provide contradictory results. In part, this can be the result of traditional molecular biological approaches that are relatively inefficient in elucidating underlying molecular mechanism. To improve the efficacy of animal models, a technological breakthrough is required. The growing availability and application of the high-throughput methods make systematic comparisons between human and animal models easier to perform. In the present study, we introduce the concept of the comparative systems biology, which we define as "comparisons of biological systems in different states or species used to achieve an integrated understanding of life forms with all their characteristic complexity of interactions at multiple levels". Furthermore, we discuss the applications of RNA-seq and ChIP-seq technologies to comparative systems biology between human and animal models and assess the potential applications for this approach in the future studies.
文摘The scores of grape wine given by wine critics have differences, therefore, for which its credibility differs. Firstly, our paper analysis differences of overall and individual for the two groups of raters. The analysis method is: first check the score whether meets the normal distribution or not by Chi-square and then test whether the mean of the two group's ratings is equal or not, through t-test, to illustrate the differences of the two groups' ratings. Secondly this paper respectively characterizes the credibility of each group's rating with the variance and gray correlation. Both the results are highly consistent on the credibility, so they can support each other. This score comparison method can be further extended to a similar scoring system.
基金the 11th National Science and Technology Supporting Program of China(2006BAB02A02)
文摘Aiming at characteristics of underground engineering,analyzed the feasibility of Multidisciplinary Design Optimization (MDO) used in underground engineering,and put forward a modularization-based MDO method and the idea of MDO to resolve problems in stability analysis,proving the validity and feasibility of using MDO in underground engi- neering.Characteristics of uncertainty,complexity and nonlinear become bottle-neck to carry on underground engineering stability analysis by MDO.Therefore,the application of MDO in underground engineering stability analysis is still at a stage of exploration,which need some deep research.
基金Project(50805144) supported by the National Natural Science Foundation of China
文摘Accurate parameter identification is essential when designing controllers for inertially stabilized platforms (lSPs). But traditional identification methods suffer from observation measurement noise and operating restrictions of ISPs. To address this issue, a novel identification method based on current command design and multilevel coordinate search (MCS) algorithm without any higher order measurement differentiations was proposed. The designed current commands were adopted to obtain parameter decoupled models with the platform operating under allowable conditions. MCS algorithm was employed to estimate the parameters based on parameter decoupled models. A comparison experiment between the proposed method and non-linear least square method was carried out and most of the relative errors of identified parameters obtained by the proposed method were below 10%. Simulation and experiment based on identified parameters were conducted. A velocity control structure was also developed with disturbance observer (DOB) for application in disturbance compensation control system of an ISR Experimental results show that the control scheme based on the identified parameters with DOB has the best disturbance rejection performance. It reduces the peak to peak value (PPV) of velocity error integral to 0.8 mrad which is much smaller than the value (10 mrad) obtained by the single velocity controller without DOB. Compared with the control scheme based on sweep model with DOB compensation, the proposed control scheme improves the PPV of velocity error integral by 1.625 times.
文摘In this paper, the function characteristics of instruction are introduced, and the focus is on contact compare instruction and the characteristics of the transfer instructions. With the traffic lights control as an example, this paper proposes the application of contact compare instruction and transfer instruction to program design method, making the program structure compact and statement concise. The control requirements are easily completed. Key words: Function Instruction; Programming; Traffic Lights; Contact Compare Instruction; Transfer
基金the China Bureau of Foreign Experts,the Ministry of Education of China (111 Program,Grant 2008B08044)the Chinese Academy of Sciences’Fellowship for Young International Scientists (Fellowship Number 2010Y1SA16)the Key Basic Research Project"973"(2010CB951301-5)
文摘Terrestrial arthropods are extremely important ecosystem components. The choice of best approaches to collect the wide range of terrestrial arthropods has been a topic of long-lasting debates. This article provides a brief overview of common sampling methods for terrestrial arthropod assemblages. We divide sampling methods into three main categories: passive sampling methods without any "activity density" bias, passive sampling methods with an "activity density" bias, and active sampling methods with inherent "activity density" and often further species-dependent biases, discussing their individual advantages and shortcomings as basis for biodiversity studies and pest control management. The selection of the optimal sampling methods depends strongly on the purpose of individual studies and the ecology and behavior of the arthropod groups targeted. A combination of different suitable methods is highly recommended in many cases.
基金Acknowledgements We thank Michael Martin, Tory Williams, and Alex Nahm for assistance in collecting fishes and the Mendelson lab for assistance in fish maintenance. We thank Chioma Ihekweazu for assistance with spectral analysis. We also thank Karen Carleton for use of the software to calculate spectral location. Tom Cronin, Kevin Omland, Megan Porter, Kate Feller, Nick Friedman and Brian Dalton provided helpful discussions throughout the course of this work. We thank two anonymous reviewers and the editor for their helpful comments on previous versions of this manuscript. We especially thank Eileen Hebets for the invitation to submit to this special issue. This work was funded through a National Science Foundation grant to TCM (#DEB 0718987). Additional support for this work came from the NSF, NCEAS and NESCENT funded "Comparative Phylogenetics in R" workshop attended by JMG.
文摘As complex traits evolve, each component of the trait may be under different selection pressures and could respond independently to distinct evolutionary forces. We used comparative methods to examine patterns of evolution in multiple components of a complex courtship signal in darters, specifically addressing the question of how nuptial coloration evolves across different areas of the body. Using spectral reflectance, we defined 4 broad color classes present on the body and fins of 17 species of freshwater fishes (genus Etheostoma) and quantified differences in hue within each color class. Ancestral state reconstruction suggests that most color traits were expressed in the most recent common ancestor of sampled species and that differences among species are mostly due to losses in coloration. The evolutionary lability of coloration varied across body regions; we found sig- nificant phylogenetic signal for orange color on the body but not for most colors on fins. Finally, patterns of color evolution and hue Of the colors were correlated among the two dorsal fins and between the anterior dorsal and anal fins, but not between any of the fins and the body. The observed patterns support the hypothesis that different components of complex signals may be subject to distinct evolutionary pressures, and suggests that the combination of behavioral displays and morphology in communication may have a strong influence on patterns of signal evolution .
文摘Objective:To explore the therapeutic methods, surgical indications and clinical practice of minimally invasive surgery on traumatic epidural hematoma(EDH). Methods:Retrospective study was made on 135 patients with traumatic EDH admitted into our hospital from June 2002 to August 2005.Sixty-five patients were treated with mini-invasive negative pressure drainage (treatment group),70 patients with comparable condition used traditional craniotomy(control group).The mean time of operation,average days in hospital,expenditure and prognosis of two groups were recorded and analyzed. Results:There was no significant difference in therapeutic efficacy between two groups.Patients in treatment group had a shorter hospital stay and less expenditure than those in control group. Conclusion:Mini-invasive negative pressure drainage is simple,effective,economical and applicable to some traumatic EDH patients.
文摘Transient CFD simulations are performed to investigate the flow behaviour inside an unshrouded pump using the SAS method. Two blade designs are compared at two different tip clearances and the results are validated by measurements. The detected vortex structure is visualized by the normalized helicity, further discussed regarding its development and behaviour and finally implicated to the efficiency of the two different blade designs.