Development and evaluation of the Air Travel Stress Scale.

Despite anecdotal evidence suggesting that air travel is personally demanding, little research has examined air travel stress. To address these issues, the author developed and evaluated the 1st known measure of air travel stress--the Air Travel Stress Scale--in 3 studies. Exploratory and confirmatory factor analysis indicated 3 components: (a) anxious reactions to adverse air travel events, (b) angry reactions to other passengers as well as an antecedent of air travel stress, and (c) the lack of trust that the airlines/airports will ensure one's comfort and safety. Each component had good internal reliability and test-retest reliability over a 6- to 7-week interval. Each component showed evidence for discriminant and convergent validity. Implications for research into understanding and intervening on air travel stress are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

对电梯曳引条件及制导行程的深入解读

用通俗的叙述对电梯的曳引理论进行了深入的解读,并推导了欧拉公式;对电梯导轨的进一步制导行程的设定也进行了深入的解读。     

棉Tencel混纺竹节布的织造实践

为了解决棉Tencel混纺竹节布在生产中出现的布面起圈、纬缩等问题,通过调整穿筘、穿综、穿停经片方法,优选经位置线、开口时间、开口量、喷嘴气压等织造工艺参数,并采用小开口、高后梁、早开口、迟引纬的工艺配置,基本消除了织造过程出现的疵点,织机效率由66%提高到85%左右,下机一等品率达到96.5%以上。     

普梳色纺纱的生产工艺优化

探讨了普梳色纺纱生产工艺的优化。针对色纺纱生产特点,从原料及生产全流程采取一系列工艺技术和管理措施,并运用正交试验优化了细纱工艺,最终较好地改善了14.6tex普梳色纺纱质量。认为:合理选用染色原棉,正确选择原料混和及混色方式,优选各工序工艺配置,严格控制色差,能够收到改善色纺成纱质量的良好效果,纺制出质量符合国家标准、满足用户要求的普梳色纺纱。     

液压挖掘机新型行走驱动系统

介绍了液压挖掘机新型行走驱动系统的特点、结构及工作原理。     

柱塞斜槽工作棱边展开图的应用与试验验证

利用CAD设计将柱塞斜槽工作棱边逼真展开,再结合计算确定柱塞斜槽上各工况的供油位置,进而验证柱塞设计、喷油泵供停油的可靠性以及拉杆位移及调速器相关结构参数的正确性,将原来复杂的理论计算过程变得直观、简便又精确。通过解决问题的实例分析了柱塞斜槽工作棱边展开图的应用,并试验验证了柱塞斜槽展开图的实用性与准确性。     

宽幅纯棉特细号高密直贡缎的织造实践

为了在双织轴宽幅喷气织机上顺利生产纯棉特细号高密直贡缎,选用100%长绒棉为经纱,50%长绒棉为纬纱,而且在织造工序采用中开口、低后梁、早开口、迟引纬、合理配置主辅喷嘴气压及引纬工艺、确保探纬器作用良好等技术措施,使织疵减少,织机效率达85.7%,入库一等品率达99.87%.     

Assessment of a simple obstacle detection device for the visually impaired

A simple obstacle detection device, based upon an automobile parking sensor, was assessed as a mobility aid for the visually impaired. A questionnaire survey for mobility needs was performed at the start of this study. After the detector was developed, five blindfolded sighted and 15 visually impaired participants were invited to conduct travel experiments under three test conditions: (1) using a white cane only, (2) using the obstacle detector only and (3) using both devices. A post-experiment interview regarding the usefulness of the obstacle detector for the visually impaired participants was performed. The results showed that the obstacle detector could augment mobility performance with the white cane. The obstacle detection device should be used in conjunction with the white cane to achieve the best mobility speed and body protection.     

按行程速比系数设计平面曲柄滑块机构的解析法

利用平面曲柄滑块机构中各有关点的坐标之间的关系,提出了一种按行程速比系数设计平面曲柄滑块机构的解析法。与现有解析法相比,该方法解题原理简单明了,计算简便,易于被工程设计人员所接受,具有较好的实用价值。     

Variations of Time of Concentration Estimates Using NRCS Velocity Method

Time of concentration (Tc) is the time required for runoff to travel from the hydraulically most distant point to the outlet of a watershed. The Natural Resources Conservation Service (NRCS) velocity method commonly is used to estimate Tc for hydrologic analysis and design. The NRCS velocity method applies the physical concept that travel time is a function of runoff flow length and flow velocity. Time of concentration for 96 Texas watersheds is independently estimated by three research teams using the NRCS velocity method. Drainage areas of the 96 watersheds considered in the study are approximately 0.8–440.3?km2 (0.3–170?mi2). Digital elevation models having a grid size of 30?m were used to derive watershed physical characteristics using ArcGIS or HEC-GeoHMS. Average channel width was estimated from 1?m or 1?ft digital orthoimagery quarter quadrangle or aerial photography. Each team made independent decisions to estimate parameters needed for different flow segments for the NRCS velocity method. Estimates of time of concentration made by three research teams are compared, and both graphic comparison and statistical summary demonstrate that time of concentration estimated using the NRCS velocity method is subject to large variation, dependent on the analyst-derived parameters used to estimate flow velocity. Because of the propensity for different analysts to arrive at different results, caution is required in application of the NRCS velocity method to estimate Tc.