Non-obstacle design is critical to tailor physically handicapped workers in manufacturing system. Simultaneous consideration of variability in physically disabled users, machines and environment of the manufacturing s...Non-obstacle design is critical to tailor physically handicapped workers in manufacturing system. Simultaneous consideration of variability in physically disabled users, machines and environment of the manufacturing system is extremely complex and generally requires modeling of physically handicapped interaction with the system. Most current modeling either concentrates on the task results or functional disability. The integration of physical constraints with task constraints is far more complex because of functional disability and its extended influence on adjacent body parts. A framework is proposed to integrate the two constraints and thus model the specific behavior of the physical handicapped in virtual environment generated by product specifications. Within the framework a simplified model of physical disabled body is constructed, and body motion is generated based on 3 levels of constraints（effecter constraints, kinematics constraints and physical constraints）. The kinematics and dynamic calculations are made and optimized based on the weighting manipulated by the kinematics constraints and dynamic constraints. With object transferring task as example, the model is validated in Jack 6.0. Modelled task motion elements except for squatting and overreaching well matched with captured motion elements. The proposed modeling method can model the complex behavior of the physically handicapped by integrating both task and physical disability constraints.展开更多
Due to the narrow space and complex structure of spacecraft cabin, the existing asssembly systems can not well suit for the assembly process of cabin products. This paper aims to introduce an assembly auxiliary system...Due to the narrow space and complex structure of spacecraft cabin, the existing asssembly systems can not well suit for the assembly process of cabin products. This paper aims to introduce an assembly auxiliary system for cabin products. A hierarchical-classification method is proposed to re-adjust the initial assembly relationship of cabin into a new hierarchical structure for efficient assembly planning. An improved ant colony algorithm based on three assembly principles is established for searching a optimizational assembly sequence of cabin parts. A mixed reality assembly environment is constructed with enhanced inforamtion to promote interaction efficiency of assembly training and guidance. Based on the machine vision technology, the inspection of left redundant objects and measurement of parts distance in inner cabin are efficiently performed. The proposed system has been applied to the assembly work of a spacecraft cabin with 107 parts, which includes cabin assembly planning, assembly training and assembly quality inspection. The application result indicates that the proposed system can be an effective assistant tool to cabin assembly works and provide an intuitive and real assembly experience for workers. This paper presents an assembly auxiliary system for spacecraft cabin products, which can provide technical support to the spacecraft cabin assembly industry.展开更多
Against the backdrop of the knowledge economy, global economy is goingthrough a major transformation. How to alleviate the pressure of resources and the environ-ment and to achieve the sustainable development of the e...Against the backdrop of the knowledge economy, global economy is goingthrough a major transformation. How to alleviate the pressure of resources and the environ-ment and to achieve the sustainable development of the economy has become a global agenda.China＇ s economy growth has been rapid for decades since the reform and opening up policy,but this has also been a great drain on China＇ s resources and the environment, which is an ur-gent problem to tackle. In recently years, the Chinese government has launched many environ-mental policies in the hope of encouraging technological innovation to guarantee the sustain-able development of the economy. However, research suggested that technological innovationis negatively correlated with environmental policies in most scenarios. In some cases, the num-ber of technological innovation decreases after policies take effect and increases after a whilelike a U - curve. In order to solve this problem, I decided to analyze the panel data from 80provinces in China between 2008 and 2014 and conclude that local governance can implementenvironmental regulations while having a positive impact on the technological innovation inenterprises. In the conclusion, suggestions are given to local governments on how to better en-force environmental policies.展开更多
An enzyme-stimulating catalyst( PTL) with copper ions( Cu^(2+)) as the activation center and aminophosphonate as ligand was developed and applied in low-temperature scouring/bleaching of cotton knits. The optimal weig...An enzyme-stimulating catalyst( PTL) with copper ions( Cu^(2+)) as the activation center and aminophosphonate as ligand was developed and applied in low-temperature scouring/bleaching of cotton knits. The optimal weight ratio of Cu^(2+) to aminophosphonate was 1 ∶75. Via orthodox and single-factor experiments,the most efficient formula for low-temperature scouring/bleaching was composed of 0. 4 g/L high-efficiency degreaser DM-1130,1. 5 g/L PTL,2. 0 g/L sodium hydroxide( NaOH),and 7. 0 g/L 30% hydrogen peroxide( H_2O_2). The PTL could not only increase the whiteness of cotton knits,but also remove pectin to enhance capillary effect.展开更多
为探究蛋白质和淀粉对魔芋凝胶的影响,研究不同质量分数红薯淀粉(sweet potato starch,SPS)和大豆分离蛋白(soy protein isolate,SPI)对魔芋凝胶的质地、色泽、感官、水分分布、流变学特性和微观结构的影响。单因素试验结果表明,SPS质...为探究蛋白质和淀粉对魔芋凝胶的影响,研究不同质量分数红薯淀粉(sweet potato starch,SPS)和大豆分离蛋白(soy protein isolate,SPI)对魔芋凝胶的质地、色泽、感官、水分分布、流变学特性和微观结构的影响。单因素试验结果表明,SPS质量分数从0%增加到2.5%对魔芋凝胶质构特性有显著影响(P<0.05),硬度和弹性分别上升86.43%和27.69%,凝胶强度和持水性显著上升(P<0.05);添加2%以下的SPI显著提高凝胶的L*值和b*值(P<0.05),硬度和弹性分别上升13.41%和15.38%,凝胶强度和持水性显著上升(P<0.05),但胶黏性降低54.19%。流变学分析结果表明,随着SPS和SPI质量分数增加,凝胶G’和G”值逐渐上升,表明凝胶结构更加牢固。低场核磁共振结果表明,二者的添加显著增加了凝胶体系中结合水含量(P<0.05),自由水和弛豫时间没有显著变化。综合评分实验结果表明,优化配比后的复合凝胶质构特性进一步提高。扫描电子显微镜结果表明,优化配比后的复合凝胶形成更为致密、结构连续的稳定结构。研究表明添加2.5%SPS和1.0%SPI为复合凝胶的最佳配比。总体来说,本研究结果为魔芋凝胶在方便即食食品的应用提供良好的实验参考和理论基础。展开更多
基金supported by National Natural Science Foundation of China(Grant No. 60975058)
文摘Non-obstacle design is critical to tailor physically handicapped workers in manufacturing system. Simultaneous consideration of variability in physically disabled users, machines and environment of the manufacturing system is extremely complex and generally requires modeling of physically handicapped interaction with the system. Most current modeling either concentrates on the task results or functional disability. The integration of physical constraints with task constraints is far more complex because of functional disability and its extended influence on adjacent body parts. A framework is proposed to integrate the two constraints and thus model the specific behavior of the physical handicapped in virtual environment generated by product specifications. Within the framework a simplified model of physical disabled body is constructed, and body motion is generated based on 3 levels of constraints（effecter constraints, kinematics constraints and physical constraints）. The kinematics and dynamic calculations are made and optimized based on the weighting manipulated by the kinematics constraints and dynamic constraints. With object transferring task as example, the model is validated in Jack 6.0. Modelled task motion elements except for squatting and overreaching well matched with captured motion elements. The proposed modeling method can model the complex behavior of the physically handicapped by integrating both task and physical disability constraints.
基金Supported by National Basic Research Project of China for the 12th Five-year Plan
文摘Due to the narrow space and complex structure of spacecraft cabin, the existing asssembly systems can not well suit for the assembly process of cabin products. This paper aims to introduce an assembly auxiliary system for cabin products. A hierarchical-classification method is proposed to re-adjust the initial assembly relationship of cabin into a new hierarchical structure for efficient assembly planning. An improved ant colony algorithm based on three assembly principles is established for searching a optimizational assembly sequence of cabin parts. A mixed reality assembly environment is constructed with enhanced inforamtion to promote interaction efficiency of assembly training and guidance. Based on the machine vision technology, the inspection of left redundant objects and measurement of parts distance in inner cabin are efficiently performed. The proposed system has been applied to the assembly work of a spacecraft cabin with 107 parts, which includes cabin assembly planning, assembly training and assembly quality inspection. The application result indicates that the proposed system can be an effective assistant tool to cabin assembly works and provide an intuitive and real assembly experience for workers. This paper presents an assembly auxiliary system for spacecraft cabin products, which can provide technical support to the spacecraft cabin assembly industry.
文摘Against the backdrop of the knowledge economy, global economy is goingthrough a major transformation. How to alleviate the pressure of resources and the environ-ment and to achieve the sustainable development of the economy has become a global agenda.China＇ s economy growth has been rapid for decades since the reform and opening up policy,but this has also been a great drain on China＇ s resources and the environment, which is an ur-gent problem to tackle. In recently years, the Chinese government has launched many environ-mental policies in the hope of encouraging technological innovation to guarantee the sustain-able development of the economy. However, research suggested that technological innovationis negatively correlated with environmental policies in most scenarios. In some cases, the num-ber of technological innovation decreases after policies take effect and increases after a whilelike a U - curve. In order to solve this problem, I decided to analyze the panel data from 80provinces in China between 2008 and 2014 and conclude that local governance can implementenvironmental regulations while having a positive impact on the technological innovation inenterprises. In the conclusion, suggestions are given to local governments on how to better en-force environmental policies.
基金South Wisdom Valley Innovative Research Team Program(No.2013CXTD05)
文摘An enzyme-stimulating catalyst( PTL) with copper ions( Cu^(2+)) as the activation center and aminophosphonate as ligand was developed and applied in low-temperature scouring/bleaching of cotton knits. The optimal weight ratio of Cu^(2+) to aminophosphonate was 1 ∶75. Via orthodox and single-factor experiments,the most efficient formula for low-temperature scouring/bleaching was composed of 0. 4 g/L high-efficiency degreaser DM-1130,1. 5 g/L PTL,2. 0 g/L sodium hydroxide( NaOH),and 7. 0 g/L 30% hydrogen peroxide( H_2O_2). The PTL could not only increase the whiteness of cotton knits,but also remove pectin to enhance capillary effect.
文摘为探究蛋白质和淀粉对魔芋凝胶的影响,研究不同质量分数红薯淀粉(sweet potato starch,SPS)和大豆分离蛋白(soy protein isolate,SPI)对魔芋凝胶的质地、色泽、感官、水分分布、流变学特性和微观结构的影响。单因素试验结果表明,SPS质量分数从0%增加到2.5%对魔芋凝胶质构特性有显著影响(P<0.05),硬度和弹性分别上升86.43%和27.69%,凝胶强度和持水性显著上升(P<0.05);添加2%以下的SPI显著提高凝胶的L*值和b*值(P<0.05),硬度和弹性分别上升13.41%和15.38%,凝胶强度和持水性显著上升(P<0.05),但胶黏性降低54.19%。流变学分析结果表明,随着SPS和SPI质量分数增加,凝胶G’和G”值逐渐上升,表明凝胶结构更加牢固。低场核磁共振结果表明,二者的添加显著增加了凝胶体系中结合水含量(P<0.05),自由水和弛豫时间没有显著变化。综合评分实验结果表明,优化配比后的复合凝胶质构特性进一步提高。扫描电子显微镜结果表明,优化配比后的复合凝胶形成更为致密、结构连续的稳定结构。研究表明添加2.5%SPS和1.0%SPI为复合凝胶的最佳配比。总体来说,本研究结果为魔芋凝胶在方便即食食品的应用提供良好的实验参考和理论基础。
