A Method for Assessing the Sustainability of Design in Developing World Projects

Projects for the developing world usually find themselves at the bottom of an engineer’s priority list. There is often very little engineering effort placed on creating new products for the poorest people in the world. This trend is beginning to change now as people begin to recognize the potential for these projects. Engineers are beginning to try and solve some of the direst issues in the developing world and many are having positive impacts. However, the conditions needed to support these projects can only be maintained in the short term. There is now a need for greater sustainability. Sustainability has a wide variety of definitions in both business and engineering. These concepts are analyzed and synthesized to develop a broad meaning of sustainability in the developing world. This primarily stems from the “triple bottom line” concept of economic, social, and environmental sustainability. Using this model and several international standards, this thesis develops a metric for guiding and evaluating the sustainability of engineering projects. The metric contains qualitative questions that investigate the sustainability of a project. It is used to assess several existing projects in order to determine flaws. Specifically, three projects seeking to deliver eyeglasses are analyzed for weaknesses to help define a new design approach for achieving better results. Using the metric as a guiding tool, teams designed two pieces of optometry equipment: one to cut lenses for eyeglasses and the other to diagnose refractive error, or prescription. These designs are created and prototyped in the developed and developing worlds in order to determine general feasibility. Although there is a recognized need for eventual design iterations, the whole project is evaluated using the developed metric and compared to the existing projects. Overall, the success demonstrates the improvements made to the long-term sustainability of the project resulting from the use of the sustainability metric

Automatic workpiece screwing machine

本发明涉及一种拧紧机，特别涉及炮弹和小口径导弹不同舱段之间大螺纹的拧紧，包括机架、拧紧单元、夹紧单元、升降滑台和升降驱动机构，其中升降滑台与机架滑动连接，升降驱动机构设置于机架上、且与升降滑台连接，夹紧单元或拧紧单元设置于升降滑台上；当夹紧单元设置于升降滑台上时，拧紧单元固定于机架的上端；当拧紧单元设置于升降滑台上时，夹紧单元设置于传输线体上，拧紧单元和夹紧单元通过相互配合实现对工件的拧紧。本发明可实现自动拧紧，解决现有拧紧过程中劳动强度大，工作效率低，且具有一定的危险性的问题；本发明结构紧凑，布局合理，适应范围广，可在生产线产品托盘工位直接进行作业

Automatic workpiece screwing machine

本发明涉及一种拧紧机，特别涉及炮弹和小口径导弹不同舱段之间大螺纹的拧紧，包括机架、拧紧单元、夹紧单元、升降滑台和升降驱动机构，其中升降滑台与机架滑动连接，升降驱动机构设置于机架上、且与升降滑台连接，夹紧单元或拧紧单元设置于升降滑台上；当夹紧单元设置于升降滑台上时，拧紧单元固定于机架的上端；当拧紧单元设置于升降滑台上时，夹紧单元设置于传输线体上，拧紧单元和夹紧单元通过相互配合实现对工件的拧紧。本发明可实现自动拧紧，解决现有拧紧过程中劳动强度大，工作效率低，且具有一定的危险性的问题；本发明结构紧凑，布局合理，适应范围广，可在生产线产品托盘工位直接进行作业

Multi-size automatic depth detection device

本发明涉及阶梯孔自动深度检测技术领域，具体的说是一种多尺寸自动深度检测装置。包括滑动检测单元、检测架体单元及升降滑台，其中升降滑台通过滑块与检测架体单元滑动连接；滑动检测单元包括深度测头、直线驱动机构及夹紧定位机构，其中夹紧定位机构设置于升降滑台的下方，用于夹紧工件；直线驱动机构设置于升降滑台的上方，且输出端与深度测头连接，深度测头与夹紧定位机构同轴安装，且用于测量工件上的不同深度尺寸。本发明的滑动检测单元上设有多个测量机构，可同时检测多个零部件，极大的提高了生产效率；测量机构采用同心结构进行检测，提高了各阶梯面的检测精度

Multi-size automatic depth detection device

本发明涉及阶梯孔自动深度检测技术领域，具体的说是一种多尺寸自动深度检测装置。包括滑动检测单元、检测架体单元及升降滑台，其中升降滑台通过滑块与检测架体单元滑动连接；滑动检测单元包括深度测头、直线驱动机构及夹紧定位机构，其中夹紧定位机构设置于升降滑台的下方，用于夹紧工件；直线驱动机构设置于升降滑台的上方，且输出端与深度测头连接，深度测头与夹紧定位机构同轴安装，且用于测量工件上的不同深度尺寸。本发明的滑动检测单元上设有多个测量机构，可同时检测多个零部件，极大的提高了生产效率；测量机构采用同心结构进行检测，提高了各阶梯面的检测精度

Multi-size automatic depth detection device

本发明涉及阶梯孔自动深度检测技术领域，具体的说是一种多尺寸自动深度检测装置。包括滑动检测单元、检测架体单元及升降滑台，其中升降滑台通过滑块与检测架体单元滑动连接；滑动检测单元包括深度测头、直线驱动机构及夹紧定位机构，其中夹紧定位机构设置于升降滑台的下方，用于夹紧工件；直线驱动机构设置于升降滑台的上方，且输出端与深度测头连接，深度测头与夹紧定位机构同轴安装，且用于测量工件上的不同深度尺寸。本发明的滑动检测单元上设有多个测量机构，可同时检测多个零部件，极大的提高了生产效率；测量机构采用同心结构进行检测，提高了各阶梯面的检测精度

Axial bolt tightening device

本发明属于自动化装配技术领域，具体地说是一种轴向螺栓拧紧装置。包括底座、外罩、支撑架、驱动装置、传动装置、旋转支撑装置及拧紧组件，其中外罩与底座连接，所述支撑架、驱动装置、传动装置、旋转支撑装置均设置于外罩内，所述支撑架与底座连接，所述驱动装置和旋转支撑装置安装在支撑架上、并通过传动装置传动连接，所述旋转支撑装置穿过外罩与拧紧组件连接。本发明特别适用狭窄空间内轴向螺栓的连续自动化装卸，在保证产品合格率的基础上提高生产效率

N-非取代氨基甲酸酯加氢制甲醇绿色过程催化体系研究

近年来,将储量丰富、成本低廉的温室气体CO_2通过化学转化制备为大宗化学品是绿色化工领域的研究前沿。甲醇是重要的有机化工原料,可以用来合成甲醛、醋酸以及甲基苯胺等化学品,可以通过CO_2直接加氢得到,但是由于CO_2化学分子的热力学稳定性与动力学惰性,CO_2直接加氢合成路线通常存在合成效率低、反应条件苛刻、产物收率低等缺点。因此,本文提出了CO_2经N-非取代氨基甲酸酯间接加氢制备甲醇新路线。该路线可有效实现</p