Coal pillar design has historically assigned a factor of safety(Fo S) or stability factor(SF) according to their estimated strength and the assumed overburden load acting on them. Acceptable Fo S values have been assi...Coal pillar design has historically assigned a factor of safety(Fo S) or stability factor(SF) according to their estimated strength and the assumed overburden load acting on them. Acceptable Fo S values have been assigned based on past mining experience or a statistical link between Fo S and probability of failure(Po F). Pillar width-to-height(w/h) ratio has long been established as having a material influence on both pillar strength and its potential failure mode. However, there has been significant disagreement on using both factor of safety(Fo S) and w/h as part of pillar system stability criterion, as compared to using Fo S in isolation. This paper will argue that there are valid technical reasons to bring w/h ratio into system stability criteria(other than its influence on pillar strength), as it is related to the post-failure stiffness of the pillar, as measured in situ, and its interaction with overburden stiffness. When overburden stiffness is also brought into pillar system stability considerations, two issues emerge. The first is the width-todepth(W/D) ratio of the panel and whether it is sub-critical or super-critical from a surface subsidence perspective. The second relates to a re-evaluation of pillar Fo S based on whether the pillar is in an elastic or non-elastic(i.e., post-yield) state in its as-designed condition, as this is relevant to maintaining overburden stiffness at the highest possible level. The significance of the model is the potential to maximise both reserve recovery and mining efficiencies without any discernible increase in geotechnical risk, particularly in thick seams and higher depth of cover mining situations. At a time when mining economics are, at best, marginal, removing potentially unnecessary design conservatism is of interest to all mine operators and is an important topic for discussion amongst the geotechnical community.展开更多
Due to different cultural and historical background, the technology in Western and Eastern pattern design is inherently different. Along with the development of technology, garment pattern design technique is making p...Due to different cultural and historical background, the technology in Western and Eastern pattern design is inherently different. Along with the development of technology, garment pattern design technique is making progress towards high effectiveness and accuracy. Many researchers proposed different alternative methodologies to improve the current pattern making processes. This article examines the development of Western and Eastern garment pattern design technique. The main objective of this article is to provide a thorough review and hence a better understanding to those researchers who made contribution on developing pattern design technique and continue their work in the future.展开更多
The history of the design of St. Joseph the Betrothed church in Olszyna Lubaflska is presented in the paper. The first design of the church was drawn up by a local master builder in 1889 but was given such a poor eval...The history of the design of St. Joseph the Betrothed church in Olszyna Lubaflska is presented in the paper. The first design of the church was drawn up by a local master builder in 1889 but was given such a poor evaluation by a firm of architects in Berlin that a new project had to be commissioned. The technical opinion on the design is analysed in the paper: both projects are discussed and some of the drawings from the projects are presented. The text of the expert evaluation and the draft of the church have never been published yet.展开更多
This paper is composed of three elements: 3D modeling, web design and heritage visualization on the basis of the chronological restoration of Fort Frontenac in 1673, 1675, 1680, 1685 and 1688, changing from narrow an...This paper is composed of three elements: 3D modeling, web design and heritage visualization on the basis of the chronological restoration of Fort Frontenac in 1673, 1675, 1680, 1685 and 1688, changing from narrow and plain to broad, grand features. The aim is to use computer graphic design to inform and create an interest in historical visualization by rebuilding Fort Frontenac using 3D modeling and interactive design. The final model can be integrated into an interactive website to learn more about the fort's historic importance. It is apparent that using computer graphics can save time and money when it comes to historical visualization. Visitors do not have to travel to the actual archaeological buildings and can simply use the web in their own homes to learn about this information virtually. In order to create a sophisticated restoration of archaeological buildings, meticulously assessing historical records will draw viewers into the visualizations, such as the historical world of Fort Frontenac. As a result, the completed restoration allows the viewers to effectively understand the fort's social system, habits and historical events.展开更多
In the past fifteen years, the attention of ship safety treatment as an objective rather than a constraint has started to sweep through the whole maritime industry. The risk-based ship design (RBD) methodology, advo...In the past fifteen years, the attention of ship safety treatment as an objective rather than a constraint has started to sweep through the whole maritime industry. The risk-based ship design (RBD) methodology, advocating systematic integration of risk assessment within the conventional design process has started to takeoff. Despite this wide recognition and increasing popularity, important factors that could potentially undermine the quality of the results come from both quantitative and qualitative aspects during the risk assessment process. This paper details a promising solution by developing a formalized methodology for risk assessment through effective storing and processing of historical data combined with data generated through first-principle approaches. This method should help to generate appropriate risk models in the selected platform (Bayesian networks) which can be employed for decision making at design stare.展开更多
From the review of development history of indoor design in China, we can see that it develops rapidly from sprout to expansion, and has large professional scale. It goes through ignorance, misconception and comprehens...From the review of development history of indoor design in China, we can see that it develops rapidly from sprout to expansion, and has large professional scale. It goes through ignorance, misconception and comprehensive understanding. And it has developed into a perfect and independent composite subject. From the perspective of interior design continuing architectural design in time-space dimension, the paper focuses on observing the application analysis of coordinated interior design, which not only provides reference for interior design in China, but also improves the interior design in China.展开更多
Near 50 years history of the development of radioisotope neutron sources in China is briefly reviewed.The structure design,preparing technology and production status of routine neutron sources including 210Po-Be sourc...Near 50 years history of the development of radioisotope neutron sources in China is briefly reviewed.The structure design,preparing technology and production status of routine neutron sources including 210Po-Be sources,210Po mock fission sources,241Am-Be sources,238Pu-Be sources,252Cf spontaneous fission sources and other special-shape neutron sources are summarized.In addition,the prospects of development on radioisotope neutron source in China are predicted from the needs of nuclear power construction,oil well-logging,neutron moisture gauge and neutron brachytherapy.展开更多
The paper deals with the urban space of Piazza del Governo in Enna, a town located in the center of Sicily. This square was realized in 1935 by the architect Salvatore Caronia Roberti and is representative of the 1930...The paper deals with the urban space of Piazza del Governo in Enna, a town located in the center of Sicily. This square was realized in 1935 by the architect Salvatore Caronia Roberti and is representative of the 1930s' fascist regime. The aim of this research is the knowledge of this urban space: the historical references, the compositive choices, the planimetric layout and its geometric rigor, and the monumentality and representativeness of the buildings overlooking the square. The research used the tools of Survey and Representation to better understand the dimensional ratios both at the urban and architectural scale. We have carried out an integrated survey (direct, photogrammetric, 3D laser scanning) in order to acquire a whole set of information essential to describe, document, and appreciate all the features of this urban space. Our investigation started by analyzing the historical documents preserved at the Historic Archive of the city of Enna (project drawings, letters, and historical images) to better understand why some decisions have been taken. The final result represents the historical memory up-to-date of the whole urban space, and it allows any academics to investigate more about the project: the initial decisions, the conservation state, and the possible and more coherent interventions of maintenance and preservation.展开更多
In order to solve the decoupling control problem of multivariable system with time delays,a new decoupling Smith control method for multivariable system with time delays was proposed. Firstly,the decoupler based on th...In order to solve the decoupling control problem of multivariable system with time delays,a new decoupling Smith control method for multivariable system with time delays was proposed. Firstly,the decoupler based on the adjoint matrix of the multivariable system model with time delays was introduced,and the decoupled models were reduced to first-order plus time delay models by analyzing the amplitude-frequency and phase-frequency characteristics. Secondly,according to the closed-loop characteristic equation of Smith predictor structure,proportion integration (PI) controllers were designed following the principle of pole assignment for Butterworth filter. Finally,using small-gain theorem and Nyquist stability criterion,sufficient and necessary conditions for robust stability were analyzed with multiplicative uncertainties,which could be encountered frequently in practice. The result shows that the method proposed has superiority for response speed and load disturbance rejection performance.展开更多
Up until the early 1960s, rural Taiwan Residents people used grindstones to grind food items such as beans or wheat. As technology developed, this tool gradually fell out of use in Taiwan. Yet for the older generation...Up until the early 1960s, rural Taiwan Residents people used grindstones to grind food items such as beans or wheat. As technology developed, this tool gradually fell out of use in Taiwan. Yet for the older generation, the tool remains a symbol of the belief that hard work will lead to prosperity. This paper aimed to invoke these memories and beliefs through the design of an innovative museum exhibit. To achieve this, we designed a human-computer interface using the form and feel of this important historical artefact. We analyzed the design of this exhibit using the Idea-People-Object-Physical Attract-Engage-Flip (IPOP-AEF) model developed by Pekarik, Schreiber, Hanemann, Richmond, and Mogel (2014). The designed exhibit "Hao Shi Duo Mo" was on show in Taiwan in May 2015. It was well-received by visitors, which was likely due to its fulfilment of each of the six elements of the IPOP-AEF model. This analysis serves as valuable reference for exhibition designer and artists.展开更多
The treatment of historical buildings represents challenges for those who are concerned with conservation. The difficulty lies in how to apply the treatment without destroying the old components and the original desig...The treatment of historical buildings represents challenges for those who are concerned with conservation. The difficulty lies in how to apply the treatment without destroying the old components and the original design of the building. The treatment processes take place by the classification of the type and the value of the building, then the determination of the deterioration level decides the level of intervention. The aim of the research is to provide a method for assessing the ways of preserving the architectural and urban heritage, which includes all the factors that affect the preservation of the heritage so as to access that it contributes to access to the deficiencies in the ways of preserving the heritage and to build a plan for action to avoid them in the future. The research followed a causal comparative research approach that began with an analytical study to determine the factors affecting preservation and its considerations, by collecting and analyzing the data of the most important international and national charters and recommendations for the preservation. This study defined the preservation works into 4 levels of interventions passed on the intervention objectives, building's physical state, causes for the deterioration and maintenance works. By comparing the deterioration level with the intervention level for the conservation procedures, the result indicates the suitability of the work performed. This result could be number between 4 and -4.展开更多
In this paper, the development history and existing shortcomings of washing machines have been briefly described, the operating principle of the current washing machines has been analyzed, user requirements and the di...In this paper, the development history and existing shortcomings of washing machines have been briefly described, the operating principle of the current washing machines has been analyzed, user requirements and the direction of industry development have been found out, and the even-drive washing technology has been studied out through adoption of hyperbolic impeller and suspended inner barrel structure, as well as high-efficiency drive and innovated control design. Thereby the problems with existing washing machines such as heavy twist and wear, uneven wash of clothes, long washing time, and high water and power consumption are solved.展开更多
The concepts of seismic isolation and energy dissipation structures emerged in the early 1970s.In China,the first seismic isolation structure was finished in 1993,and the first energy dissipation structure was built a...The concepts of seismic isolation and energy dissipation structures emerged in the early 1970s.In China,the first seismic isolation structure was finished in 1993,and the first energy dissipation structure was built at about the same time.Up to 2007,China had more than 600 seismic isolation and about 100 energy dissipation building structures.In 2008,the huge Wenchuan earthquake hit the southwest of China,which triggered a bloom of new seismic isolation and energy dissipation structures.This paper presents the development history and representative applications of seismic isolation and energy dissipation structures in China,reviews the state-of-the-practice of Chinese design,and discusses the challenges in the future applications.Major findings are as follows:Basic design procedures are becoming standardized after more than ten years of experiences,which mainly involve determination of design earthquake forces,selection of ground motions,modeling and time-history analyses,and performance criteria.Nonlinear time-history analyses using multiple ground motions are the characteristic of the design of seismic isolation and energy dissipation structures.Regulations,standardization and quality control of devices,balance between performance and cost,comparison with real responses,and regular inspection are identified as the issues that should be improved to further promote the application of seismic isolation and energy dissipation structures in China.展开更多
文摘Coal pillar design has historically assigned a factor of safety(Fo S) or stability factor(SF) according to their estimated strength and the assumed overburden load acting on them. Acceptable Fo S values have been assigned based on past mining experience or a statistical link between Fo S and probability of failure(Po F). Pillar width-to-height(w/h) ratio has long been established as having a material influence on both pillar strength and its potential failure mode. However, there has been significant disagreement on using both factor of safety(Fo S) and w/h as part of pillar system stability criterion, as compared to using Fo S in isolation. This paper will argue that there are valid technical reasons to bring w/h ratio into system stability criteria(other than its influence on pillar strength), as it is related to the post-failure stiffness of the pillar, as measured in situ, and its interaction with overburden stiffness. When overburden stiffness is also brought into pillar system stability considerations, two issues emerge. The first is the width-todepth(W/D) ratio of the panel and whether it is sub-critical or super-critical from a surface subsidence perspective. The second relates to a re-evaluation of pillar Fo S based on whether the pillar is in an elastic or non-elastic(i.e., post-yield) state in its as-designed condition, as this is relevant to maintaining overburden stiffness at the highest possible level. The significance of the model is the potential to maximise both reserve recovery and mining efficiencies without any discernible increase in geotechnical risk, particularly in thick seams and higher depth of cover mining situations. At a time when mining economics are, at best, marginal, removing potentially unnecessary design conservatism is of interest to all mine operators and is an important topic for discussion amongst the geotechnical community.
基金This Research is Supported by the Tuition Scholarship from The Hong Kong Polytechnic University
文摘Due to different cultural and historical background, the technology in Western and Eastern pattern design is inherently different. Along with the development of technology, garment pattern design technique is making progress towards high effectiveness and accuracy. Many researchers proposed different alternative methodologies to improve the current pattern making processes. This article examines the development of Western and Eastern garment pattern design technique. The main objective of this article is to provide a thorough review and hence a better understanding to those researchers who made contribution on developing pattern design technique and continue their work in the future.
文摘The history of the design of St. Joseph the Betrothed church in Olszyna Lubaflska is presented in the paper. The first design of the church was drawn up by a local master builder in 1889 but was given such a poor evaluation by a firm of architects in Berlin that a new project had to be commissioned. The technical opinion on the design is analysed in the paper: both projects are discussed and some of the drawings from the projects are presented. The text of the expert evaluation and the draft of the church have never been published yet.
文摘This paper is composed of three elements: 3D modeling, web design and heritage visualization on the basis of the chronological restoration of Fort Frontenac in 1673, 1675, 1680, 1685 and 1688, changing from narrow and plain to broad, grand features. The aim is to use computer graphic design to inform and create an interest in historical visualization by rebuilding Fort Frontenac using 3D modeling and interactive design. The final model can be integrated into an interactive website to learn more about the fort's historic importance. It is apparent that using computer graphics can save time and money when it comes to historical visualization. Visitors do not have to travel to the actual archaeological buildings and can simply use the web in their own homes to learn about this information virtually. In order to create a sophisticated restoration of archaeological buildings, meticulously assessing historical records will draw viewers into the visualizations, such as the historical world of Fort Frontenac. As a result, the completed restoration allows the viewers to effectively understand the fort's social system, habits and historical events.
基金the financial support received by the University of Strathclyde in the form of a postgraduate research scholarship for the duration of the second author’s P hD studies
文摘In the past fifteen years, the attention of ship safety treatment as an objective rather than a constraint has started to sweep through the whole maritime industry. The risk-based ship design (RBD) methodology, advocating systematic integration of risk assessment within the conventional design process has started to takeoff. Despite this wide recognition and increasing popularity, important factors that could potentially undermine the quality of the results come from both quantitative and qualitative aspects during the risk assessment process. This paper details a promising solution by developing a formalized methodology for risk assessment through effective storing and processing of historical data combined with data generated through first-principle approaches. This method should help to generate appropriate risk models in the selected platform (Bayesian networks) which can be employed for decision making at design stare.
文摘From the review of development history of indoor design in China, we can see that it develops rapidly from sprout to expansion, and has large professional scale. It goes through ignorance, misconception and comprehensive understanding. And it has developed into a perfect and independent composite subject. From the perspective of interior design continuing architectural design in time-space dimension, the paper focuses on observing the application analysis of coordinated interior design, which not only provides reference for interior design in China, but also improves the interior design in China.
文摘Near 50 years history of the development of radioisotope neutron sources in China is briefly reviewed.The structure design,preparing technology and production status of routine neutron sources including 210Po-Be sources,210Po mock fission sources,241Am-Be sources,238Pu-Be sources,252Cf spontaneous fission sources and other special-shape neutron sources are summarized.In addition,the prospects of development on radioisotope neutron source in China are predicted from the needs of nuclear power construction,oil well-logging,neutron moisture gauge and neutron brachytherapy.
文摘The paper deals with the urban space of Piazza del Governo in Enna, a town located in the center of Sicily. This square was realized in 1935 by the architect Salvatore Caronia Roberti and is representative of the 1930s' fascist regime. The aim of this research is the knowledge of this urban space: the historical references, the compositive choices, the planimetric layout and its geometric rigor, and the monumentality and representativeness of the buildings overlooking the square. The research used the tools of Survey and Representation to better understand the dimensional ratios both at the urban and architectural scale. We have carried out an integrated survey (direct, photogrammetric, 3D laser scanning) in order to acquire a whole set of information essential to describe, document, and appreciate all the features of this urban space. Our investigation started by analyzing the historical documents preserved at the Historic Archive of the city of Enna (project drawings, letters, and historical images) to better understand why some decisions have been taken. The final result represents the historical memory up-to-date of the whole urban space, and it allows any academics to investigate more about the project: the initial decisions, the conservation state, and the possible and more coherent interventions of maintenance and preservation.
基金Projects(60634020, 61074117) supported by the National Natural Science Foundation of China
文摘In order to solve the decoupling control problem of multivariable system with time delays,a new decoupling Smith control method for multivariable system with time delays was proposed. Firstly,the decoupler based on the adjoint matrix of the multivariable system model with time delays was introduced,and the decoupled models were reduced to first-order plus time delay models by analyzing the amplitude-frequency and phase-frequency characteristics. Secondly,according to the closed-loop characteristic equation of Smith predictor structure,proportion integration (PI) controllers were designed following the principle of pole assignment for Butterworth filter. Finally,using small-gain theorem and Nyquist stability criterion,sufficient and necessary conditions for robust stability were analyzed with multiplicative uncertainties,which could be encountered frequently in practice. The result shows that the method proposed has superiority for response speed and load disturbance rejection performance.
文摘Up until the early 1960s, rural Taiwan Residents people used grindstones to grind food items such as beans or wheat. As technology developed, this tool gradually fell out of use in Taiwan. Yet for the older generation, the tool remains a symbol of the belief that hard work will lead to prosperity. This paper aimed to invoke these memories and beliefs through the design of an innovative museum exhibit. To achieve this, we designed a human-computer interface using the form and feel of this important historical artefact. We analyzed the design of this exhibit using the Idea-People-Object-Physical Attract-Engage-Flip (IPOP-AEF) model developed by Pekarik, Schreiber, Hanemann, Richmond, and Mogel (2014). The designed exhibit "Hao Shi Duo Mo" was on show in Taiwan in May 2015. It was well-received by visitors, which was likely due to its fulfilment of each of the six elements of the IPOP-AEF model. This analysis serves as valuable reference for exhibition designer and artists.
文摘The treatment of historical buildings represents challenges for those who are concerned with conservation. The difficulty lies in how to apply the treatment without destroying the old components and the original design of the building. The treatment processes take place by the classification of the type and the value of the building, then the determination of the deterioration level decides the level of intervention. The aim of the research is to provide a method for assessing the ways of preserving the architectural and urban heritage, which includes all the factors that affect the preservation of the heritage so as to access that it contributes to access to the deficiencies in the ways of preserving the heritage and to build a plan for action to avoid them in the future. The research followed a causal comparative research approach that began with an analytical study to determine the factors affecting preservation and its considerations, by collecting and analyzing the data of the most important international and national charters and recommendations for the preservation. This study defined the preservation works into 4 levels of interventions passed on the intervention objectives, building's physical state, causes for the deterioration and maintenance works. By comparing the deterioration level with the intervention level for the conservation procedures, the result indicates the suitability of the work performed. This result could be number between 4 and -4.
文摘In this paper, the development history and existing shortcomings of washing machines have been briefly described, the operating principle of the current washing machines has been analyzed, user requirements and the direction of industry development have been found out, and the even-drive washing technology has been studied out through adoption of hyperbolic impeller and suspended inner barrel structure, as well as high-efficiency drive and innovated control design. Thereby the problems with existing washing machines such as heavy twist and wear, uneven wash of clothes, long washing time, and high water and power consumption are solved.
基金supported by the National Natural Science Foundation of China (Grant No. 51178250)the Tsinghua University (Grant No.2010z01001)
文摘The concepts of seismic isolation and energy dissipation structures emerged in the early 1970s.In China,the first seismic isolation structure was finished in 1993,and the first energy dissipation structure was built at about the same time.Up to 2007,China had more than 600 seismic isolation and about 100 energy dissipation building structures.In 2008,the huge Wenchuan earthquake hit the southwest of China,which triggered a bloom of new seismic isolation and energy dissipation structures.This paper presents the development history and representative applications of seismic isolation and energy dissipation structures in China,reviews the state-of-the-practice of Chinese design,and discusses the challenges in the future applications.Major findings are as follows:Basic design procedures are becoming standardized after more than ten years of experiences,which mainly involve determination of design earthquake forces,selection of ground motions,modeling and time-history analyses,and performance criteria.Nonlinear time-history analyses using multiple ground motions are the characteristic of the design of seismic isolation and energy dissipation structures.Regulations,standardization and quality control of devices,balance between performance and cost,comparison with real responses,and regular inspection are identified as the issues that should be improved to further promote the application of seismic isolation and energy dissipation structures in China.