浅谈水务一体化及引额济乌后水资源利用

从水资源的属性看 ,只有实行统一管理才能充分发挥管理的社会、经济与环境三重效益。也只有水务一体化区域才能实行三水 (地表水、地下水、处理水 )三统 (统一分配、统一价格、统一管理 )用水政策措施     

筑路机械施工中的困境救援

筑路机械施工中的困境救援西安公路学院郑忠敏ＰｉｐｅｊａｃｋｉｎｇＴｅｃｈｎｏｌｏｇｙ￥ＴａｎｇＹｕａｎｎｉｎｇＡｂｓｔｒａｃｔ：ｌｎｔｒｏｄｕｃｅｄｔｈｅａｄｖａｎｔａｇｅｓａｒｉｄａｐｐｌｉｃａｔｉｏｎｒａｎｇｅｏｆａｐｐｌｉｎｇｔｈｅｐｉｐｅｊａ...     

在役舰船计量保证——周期检测／校准的思考

以具体事例阐述了在役舰船开展周期检测／校准的重要性，并提出以总体为龙头兼顾系统与接口及设备周期检测／校准，开展和实施在役舰船计量保证的建议，说明在役舰船计量保证势在必行。     

TYJL-Ⅱ型计算机联锁维修测试系统

随着铁路跨越式发展和计算机电子技术日臻成熟，计算机联锁系统越来越受到用户的青睐，与此同时也给电务系统维修提出新的课题，计算机联锁系统的维修迫在眉睫。为了协助铁路局组建二级维修中心，TYJL-Ⅱ型计算机联锁维修测试系统应运而生，下面详细介绍一下该系统。     

驼峰调车技术研究开发的形势和对策

本文回顾了我国驼峰调车技术发展的历史，总结了铁道部科学研究院在驼峰现代化理论和实践上所作的贡献，以及该专业发展的主要经验，分析了当前的形势，并提出了重振专业优势的目标和对策。     

Development of a Robotic Cochlear Implantation System

Traditional cochlear implantation surgery has problems such as high surgical accuracy requirement and large trauma,which cause the difficulty of the operation and the high requirements for doctors,so that only a few doctors can complete the operation independently.However,there is no research on robotic cochlear implantation in China.In response to this problem,a robotic cochlear implantation system is proposed.The robot is controlled by robot operating system (ROS).A simulation environment for the overall surgery is established on the ROS based on the real surgery environment.Through the analysis of the kinematics and the motion planning algorithm of the manipulator,an appropriate motion mode is designed to control the motion of the manipulator,and perform the surgery under the simulation environment.A simple and feasible method of navigation is proposed,and through the model experiment,the feasibility of robotic cochlear implantation surgery is verified.     

Depth Camera-Based Robot-Assisted Ultrasonic Lipolysis System

With many advantages such as non-invasive,safe and quick effect,focused ultrasound lipolysis stands out among many fat-removing methods.However,during the whole process,the doctor needs to hold the ultra-sound transducer and press it on the patient's skin with a large pressure for a long time;thus the probability of muscle and bone damage for doctors is greatly increased.To reduce the occurrence of doctors' occupational diseases,a depth camera-based ultrasonic lipolysis robot system is proposed to realize robot-assisted automatic ultrasonic lipolysis operation.The system is composed of RealSense depth camera,KUKA LBR Med seven-axis robotic arm,PC host,and ultrasonic lipolysis instrument.The whole operation includes two parts:preoperative planning and intraoperative operation.In preoperative planning,the treatment area is selected in the camera image by the doctor;then the system automatically plans uniformly distributed treatment points in the treat-ment area.At the same time,the skin normal vector is calculated to determine the end posture of the robot,so that the ultrasound transducer can be pressed down in the normal direction of skin.During the intraoperative operation,the robot is controlled to arrive at the treatment point in turn.Meanwhile,the patient's movement can be detected by the depth camera,and the path of robot is adjusted in real time so that the robot can track the movement of patient,thereby ensuring the accuracy of the ultrasonic lipolysis operation.Finally,the human body model experiment is conducted.The results show that the maximum error of the robot operation is within 5 mm,average error is 3.1 mm,and the treatment points of the robot operation are more uniform than those of manual operation.Therefore,the system can replace the doctor and achieve autonomous ultrasonic lipolysis to reduce the doctor's labor intensity.     

往复流散热方式的锂离子电池热管理

为解决电池模块内部单体电池间的温度不均匀性而影响电池的使用性能和寿命的问题,本文中采用了一种往复流冷却方式,使冷却空气流动方向周期性逆转,以降低单向流空气冷却方式时单体电池沿空气流方向的温度梯度。结果表明,采用往复流冷却方式后,在1C和13.33C放电倍率下,电池温度均匀性分别提高了12.1%和62.4%,电池模块的使用性能和安全性得到改善,电池使用寿命得以提高。同时,文中还利用计算流体动力学虚拟试验与正交优化相结合,对影响往复流散热性能的往复流入口的速度与温度和往复周期3个参数进行了优化,并揭示了它们对电池最高温度和温差的影响规律。     

双层排水路面在遂资眉高速公路工程中的应用

双层排水路面结构体系相对于传统的单层排水沥青路面结构在降噪、抗滑、排水、抗冻及耐久性等方面具有较大的优势。文中通过双层排水降噪沥青路面在遂资眉高速公路工程中的实际应用,对双层排水性沥青混合料的配合比设计及其性能进行了试验测试分析,并就工程施工的要点进行了总结。     

What is the relationship between online activity and driving-licence-holding amongst young adults?

There is growing interest amongst both practitioners and researchers in the correlates of young adults’ driving-licence-acquisition. One aspect of the ongoing scholarly debate is whether taking part in online (i.e. virtual) activities may be associated with young adults feeling less need to drive and hence to acquire a driving licence. This paper addresses this issue by drawing on analysis of two distinct datasets. Both contain rich pseudo-diary instruments in which people indicate detailed characteristics of their unique online-activity profile. This includes both indicators of the types of online activities in which respondents participate, and a separate metric of internet-use intensity. The latter is defined in one dataset as the amount of time/week spent online, and in the other dataset the frequency of their internet use. On the basis of a set of multivariate regression analyses, a positive (i.e. complementary) cross-sectional relationship between young adults’ online activity and licence-holding was found. We find that young adults who use the internet are, net of confounding effects, more likely to hold a driving licence than otherwise identical young adults who do not use the internet. Both datasets show this type of effect, and it is robust across a range of model specifications, including multi-stage estimations to address cross-correlation between indicators of internet usage. In addition to the positive net statistical association, we also report several other noteworthy effects. Of the six effects associated with online-activity types that are directly comparable between the two datasets, we find that the correlation in the parameter estimates across the two datasets is 0.63. This suggests similar types of relationships across the two datasets. Also, in several (but not all) of our analyses we found an inverted ‘U’ shaped ceteris paribus relationship between intensity-of-internet-use and licence-holding. The positive net statistical association between internet use and licence-holding is a different relationship than previously reported in the literature, and therefore further research is needed to reconcile the differences (which are likely due at least in part to different methodological approaches and data resources). Further research is also needed to continue to resolve between the relative saliency of other hypothesised determinants of licence-holding (e.g. economic and socio-demographic explanators, as well as licence-acquisition regimes that vary by time and place).