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液压支架关键姿态参数测量系统

工矿自动化 2024年第4期50卷 41-49页

作者：刘相通李曼沈思怡曹现刚刘俊祺西安科技大学机械工程学院陕西西安710054 西安科技大学陕西省矿山机电装备智能检测与控制重点实验室陕西西安710054

针对现有液压支架姿态监测方法测量参数不全面、精度和可靠性不高、工况环境适应性差等问题,提出一种直接测量与间接测量相结合的液压支架关键姿态参数测量系统,研制了以DSP为核心、以MEMS惯导为测量元件、具备LoRa无线通信功能的姿态... 详细信息

针对现有液压支架姿态监测方法测量参数不全面、精度和可靠性不高、工况环境适应性差等问题,提出一种直接测量与间接测量相结合的液压支架关键姿态参数测量系统,研制了以DSP为核心、以MEMS惯导为测量元件、具备LoRa无线通信功能的姿态传感器。分析得出了影响液压支架支护姿态的关键参数,其中底座、前连杆、掩护梁和顶梁与水平面夹角及推移步距采用直接测量方式,支护高度、立柱与平衡千斤顶长度采用间接测量方式。该系统包括安装于底座、前连杆、掩护梁、顶梁处的4个姿态传感器和1个安装于底座的红外激光测距传感器,采用LoRa无线通信方式组网。底座处的姿态传感器作为网关(即网关传感器),用于测量底座与水平面的夹角,控制红外激光测距传感器测量推移步距,并解算支护高度、立柱长度和平衡千斤顶长度;其他3处的姿态传感器作为节点(即节点传感器),用于测量前连杆、掩护梁和顶梁与水平面的夹角,并将获得的角度信息上报至网关传感器。测试结果表明,姿态角测量的最大绝对误差为0.2°,支护高度、立柱长度、平衡千斤顶长度测量的最大百分比相对误差分别为0.78%,0.72%,0.83%,推移步距测量的最大绝对误差为1.9 mm。以ZY9000/22/45D型液压支架为例,分析其在不同姿态角范围下的误差分布,得到支护高度最大测量误差为27.4 mm,立柱长度最大测量误差为16.6 mm。

关键词：液压支架姿态监测姿态传感器红外激光测距 MEMS LoRa

Abnormal Activity of Sympathetic Nervous System in Girls with Adolescent Idiopathic Scoliosis： A Cross-sectional Study

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Biomedical and Environmental Sciences 2018年第9期31卷 700-704页

作者： HU Zong Shan ZHAO Zhi Hui TSENG Chang-Chun LI Jie man Gene Chi-Wai LAM Tsz-Ping QIU Yong CHENG Chun-Yiu jack ZHU Ze Zhang LIU Zhen Department of Orthopaedics and Traumatology Faculty of Medicine Prince of Wales Hospital The Chinese University of Hong Kong Shatin New Territories 999077 Hong Kong China The Joint Scoliosis Research Center of the Chinese University of Hong Kong and Nanjing University Hong Kong 999077 China Department of Spine Surgery the Affiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjing 210008 Jiangsu China

The objective of this study was to characterize sympathetic nervous system （SNS） activity in girls with adolescent idiopathic scoliosis （AIS） and investigate the correlation of such activity with body weight and bone mass. Fifty-eight girls with AIS and 21 healthy controls were recruited. Abnormal growth pattern （lower weight, lower body mass index （BMI）, and longer arm span） and significantly increased adrenaline （AD） level, norepinephrine （NE） level, and low-frequency （LF） were found in girls with AIS. Circulating AD level, NE level, and LF power were negatively correlated with body weight and BMI but significantly correlated with bone quality.

关键词： AIS A Cross-sectional Study SNS BMD

Follow-up evaluation with ultrasonography of peripheral nerve injuries after an earthquake

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Neural Regeneration Research 2014年第6期9卷 582-588页

作者： man Lu Yue Wang Linxian Yue jack Chiu Fanding He Xiaojing Wu Bin Zang Bin Lu Xiaoke Yao Zirui Jiang Department of Ultrasound Sichuan Provincial People’s Hospital Department of Orthopedics Sichuan Provincial People’s Hospital Department of Radiology University Hospital University of Western Ontario Chengdu Jiaxiang Foreign Languages School

Published data on earthquake-associated peripheral nerve injury is very limited. Ultrasonography has been proven to be efficient in the clinic to diagnose peripheral nerve injury. The aim of this study was to assess the role of ultrasound in the evaluation of persistent peripheral nerve injuries 1 year after the Wenchuan earthquake. Thirty-four patients with persistent clinical symptoms and neurologic signs of impaired nerve function were evaluated with sonography prior to surgi- cal repair. Among 34 patients, ultrasonography showed that 48 peripheral nerves were entrapped, and 11 peripheral nerves were disrupted. There was one case of misdiagnosis on ultrasonogra- phy. The concordance rate of ultrasonographic findings with those of surgical findings was 98%. A total of 48 involved nerves underwent neurolysis and the symptoms resolved. Only five nerves had scar tissue entrapment. Preoperative and postoperative clinical and ultrasonographic results were concordant, which verified that ultrasonography is useful for preoperative diagnosis and postoperative evaluation of injured peripheral nerves.

关键词： nerve regeneration earthquake Wenchuan ultrasound peripheral nerve nerve injury repair follow-up 863 Program neural regeneration

Targeting growth hormone function: strategies and therapeutic applications

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Signal Transduction and Targeted Therapy 2019年第1期4卷 614-624页

作者： man Lu jack U.Flanagan Ries J.Langley Michael P.Hay Jo K.Perry Liggins Institute University of AucklandAucklandNew Zealand Auckland Cancer Society Research Centre School of Medical SciencesUniversity of AucklandAucklandNew Zealand Maurice Wilkins Centre for Molecular Biodiscovery AucklandNew Zealand Department of Molecular Medicine and Pathology School of Medical SciencesUniversity of AucklandAucklandNew Zealand

Human growth hormone(GH)is a classical pituitary endocrine hormone that is essential for normal postnatal growth and has pleiotropic effects across multiple physiological *** is also expressed in extrapituitary tissues and has localized autocrine/paracrine effects at these *** adults,hypersecretion of GH causes acromegaly,and strategies that block the release of GH or that inhibit GH receptor(GHR)activation are the primary forms of medical therapy for this *** of GH has also been linked to cancer and the microvascular complications that are associated with ***,studies to investigate the therapeutic potential of GHR antagonism in these diseases have been limited,most likely due to difficulty in accessing therapeutic tools to study the pharmacology of the receptor in *** review will discuss current and emerging strategies for antagonizing GH function and the potential disease indications.

关键词： therapeutic pituitary diseases

Osteogenic enhancement of low intensity pulsed ultrasound on bone marrow mesenchymal stem cell

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Osteogenic enhancement of low intensity pulsed ultrasound on...

International Conference on Osteoporosis and Bone Research 2008

作者： Fan Fong Celine Hui Kwong man Lee Kwok Sui Leung Chun Yiu jack Cheng Department of Orthopaedics and Traumatology The Chinese University of Hong KongHong KongChina Lee Hysan Clinical Research Laboratories The Chinese University of Hong KongHong KongChina

＜正＞Objective:Low intensity pulsed ultrasound （LIPUS） is known to accelerate mineralization and bone regeneration,but the osteogenic effect on mesenchymal stem cells （MSCs） is still *** study investigated the ef...

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纯爱英文馆杰克·伦敦短篇小说选 1

丛书名：纯爱英文馆

2012年

作者：（美）jack·london

《纯爱英文馆：杰克·伦敦中短篇小说选（英文版）》主要内容包括：The Call of the Wild，Love of Life，Diable-a Dog，An Odyssey of the North，To the man on Trail，To Build a Fire。

ISBN: (纸本)7507834441

关键词：小说集语言文教中篇小说英语近代短篇小说美国

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74.8—嘌呤氮芥类化合物的合成

药学进展 1961年第Z1期 7-8页

作者： Shih Chu jack E.Har Henry G.man 赵连昌

作者鉴于将氮芥类化合物中的双(β—氯乙基)胺基和抗疟药、氨基酸、甾醇类化合物等分子相联,可以增强其制癌效用;同时又根据“交链结合”的假說,于是合成了黄嘌吟、次黃嘌吟、腺嘌吟的8—双(β—氯乙基)胺基等衍生物。

关键词：氮芥类抗疟药氯乙基交链闭水气月于明

“应时之需”与“卓越追求”:农村小学全科教师的名与实之辨

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教师教育研究 2019年第3期31卷 39-44,60页

作者：满忠坤聊城大学教育科学学院

对培养农村小学全科教师的背景和目标的误解或错判,使全科教师的内涵理解和实践运作存在诸多偏误或盲目。当前农村小学全科教师的培养,旨在应对农村小学'自然小班化'和教师资源配置不足的'时代之需',与国外发达地区基于课程整合和小班... 详细信息

对培养农村小学全科教师的背景和目标的误解或错判,使全科教师的内涵理解和实践运作存在诸多偏误或盲目。当前农村小学全科教师的培养,旨在应对农村小学'自然小班化'和教师资源配置不足的'时代之需',与国外发达地区基于课程整合和小班化教学的全科教师的'卓越追求'具有本质的区别。理想的'全科型'教师应具备全面性、通识性、广博性的知识素养,但这并不意味着小学教师都是全能型的'万金油'。全科教师的有效推行,有赖于课程整合和小班化教学的协同推进,不应等同于'中师教育'的复归,促进城乡教育均衡发展是其基础保障和目标诉求。

关键词：全科教师包班制小班化教学课程整合中师教育

Morphological Response of jack Pine to the Interactive Effects of Carbon Dioxide, Soil Temperature and Photoperiod

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American Journal of Plant Sciences 2016年第6期7卷 879-893页

作者： Md. Shah Newaz Qing-Lai Dang Rongzhou man Faculty of Natural Resources management Lakehead University Thunder Bay Canada Ontario Ministry of Natural Resources Ontario Forest Research Institute Sault Ste. Marie Canada

Responding to the predicted shift in climate envelope jack pine, (Pinus banksiana Lamb.) might migrate 10° northward between 2071 and 2100 and will be exposed to a different photoperiod regime. Successful migration of the species might depend on the initial acclimating capability to the conditions of new location. The impacts of elevated carbon dioxide concentration [CO2], soil temperature and photoperiod on the phenological traits, growth and biomass responses in jack pine seedlings were investigated. Seedlings were grown in greenhouses under two [CO2] (400 and 950 μmol•mol-1), two soil temperatures (ambient soil temperature at seed origin and 5°C warmer) and three photoperiod regimes (photoperiods at seed origin, 5° north of the seed origin and 10° north of the seed origin). Budburst and bud setting time were recorded and the seedling height (Ht), root collar diameter (RCD), root biomass, stem biomass and leaf biomass were measured after six months of treatment. It was observed that under elevated [CO2], ambient Tsoil and photoperiods associated with 10° northward migrations budburstis advanced by 10 days. Photoperiods toward north significantly prolonged the bud setting time. However, tri-factor interactive effect on bud set was not statistically significant. Elevated [CO2] significantly (P 2] significantly increased the projected leaf area, it had no significant effect on specific leaf area. Elevated [CO2] significantly reduced the shoot to root ratio, which indicated higher biomass allocation in roots under elevated [CO2]. However, all these growth and biomass responses were statistically insignificant under tri-factor interactive effects. The results suggest that climate cha

关键词： Tree Seedling Physiology Plant Ecophysiology Tree Migration Climate Change Boreal Forest