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Effect of Working Position on Vertical Motion Straightness of Open Hydrostatic Guideways in Grinding Machine

Chinese Journal of Mechanical Engineering 2017年第1期30卷 46-52页

作者： ZHA JUn WANG Zhiwei XUE Fei chen yaolong State Key Laboratory for Manufacturing Systems Engineering Xi 'an Jiaotong University Xi 'an 710049 China College of Mechanical and Electronic Engineering Shandong University of Science and Technology Qingdao 266590 China

Hydrostatic guideways have various applications in precision machine tools due to their high motion accuracy. The analysis of motion straightness in hydrostatic guideways is generally ignoring the external load on the slider. A variation force also exists, caused by the different working positions, together with the dead load of the slider and that of other auxiliary devices. The effect of working position on vertical motion straightness is investigated based on the equivalent static model, considering the error averaging effort of pressured oil film in open hydrostatic guideways. Open hydrostatic guideways in LGF1000 are analyzed with this approach. The theoretical results show that the slider has maximum vertical motion straightness when the working position is closer the guiderail of Y axis. The vertical motion straightness reaches a minimum value as the working position is located at the center of the two guiderails on the Y axis. The difference between the maximum and minimum vertical motion straightness is 34.7%. The smaller vertical motion straightness is attributed to the smaller spacing of the two pads centers, along the Y direction. The experimental results show that the vertical motion straightness is 4.15 μm/1200 mm, when the working position is located in the middle of the Xbeam, and 5.08 pro/1200 mm, when the working position is approaching the Y guiderails, denoting an increase of 18.3%. The changing trends of the measured results validate the correctness of the theoretical model. The research work can be used to reveal the variation law of accuracy of the open hydrostatic guideways, under different working positions, to predict the machining precision, and provides the basis for an error compensation strategy for gantry type grinding machines.

关键词： open hydrostatic guideways error averaging vertical motion straightness working position

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2019 Chinese Clinical Practice Guidelines for the Prevention of Mother-to-child Transmission of Hepatitis B Virus

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Journal of Clinical and Translational Hepatology 2020年第4期8卷 397-406页

作者： Caiyun NieJinfeng Liu Tianyan chen yaolong chen Hong Ren Guiqiang Wang Wenhong Zhang Yingren Zhao The First Affiliated Hospital of Xi’an Jiaotong University Xi’anShaanxiChina Shaanxi Clinical Research Center of Infectious Diseases Xi’anShaanxiChina Evidence-Based Medicine Center Basic Medical SciencesLanzhou UniversityLanzhouGansuChina WHO Collaborating Centre for Guideline Implementation and Knowledge Translation LanzhouGansuChina Department of Infectious Diseases The Second Affiliated Hospital of Chongqing Medical UniversityChongqingChina Hepatology Center Department of Infectious DiseasesPeking University First HospitalBeijingChina Department of Infectious Diseases Huashan Hospital Affiliated to Fudan UniversityShanghaiChina

To develop the evidence-based guidelines for managing mother-to-child transmission of hepatitis B virus in China, a multidisciplinary guideline development group was estab-lished. Clinical questions were identified from two rounds of surveys on the concerns of first-line clinicians. We conducted a comprehensive search and review of the literature. A grading of recommendations' assessment, development, and evaluation system was adopted to rate the quality of evidence and the strength of recommendations. Recommen-dations were formulated based on the evidence, overall balance of benefits and harms (at individual and population levels), patient/health worker values and preferences, re-sources available, cost-effectiveness, and feasibility. Even-tually, recommendations related to 13 main clinical concerns were developed, covering diagnostic criteria, treatment in-dications, antiviral therapy choice, timing to initiate and discontinue treatment, immunoprophylaxis strategy at birth, and how to deal with special situations, such as unintended pregnancy, assisted reproduction, and breastfeeding. The guidelines are intended to serve as guidance for clinicians and patients, to optimize the management of majority of pregnant women who are positive for hepatitis B surface antigen. Guideline registration: International Practice Guide Registration Platform (IPGRP-2018CN040).

关键词： Hepatitis B virus Mother-to-child transmission Clinical practice guidelines Prevention GRADE

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Simulation and Experimental Analysis of Vortex Tube Using Steel Material

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Open Journal of Fluid Dynamics 2020年第3期10卷 151-163页

作者： Muhammad Bilal yaolong chen Jun Zha Naveed Ullah School of Mechanical Engineering Xi’an Jiaotong University Xi’an China State Key Laboratory for Manufacturing System Engineering Xi’an Jiaotong University Xi’an China

Experimental and computational fluid dynamics (CFD) are investigated through the vortex tube system. The benefit of vortex tube is a counter flow type tube, which has further designed and fabricated for investigation. The whole set up is consisting of a simple device that can separate a single stream of compressed air into two streams;one is at high temperature and the other is lower temperature following an inlet gas stream. The advantages of this tube are their compactness, safety, and low equipment cost mainly used in cooling and heating applications. This study addressed three-dimensional flows;the domain is using computational fluid dynamics (CFD) method and experimental approach to optimize the direction of RHVT. Through the CFD analysis, the best cold end diameter (dc), number of nozzles, and the best parameters for obtaining the highest hot gas temperature and lowest cold gas temperature were obtained and verified by experimental procedures.

关键词： Ranque-Hilsch Vortex Tube Design Analysis & Fabrication Experimental of Vortex Tube Steel Material

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大型多纵梁矩形渡槽结构静力计算方法研究

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水力发电学报 2005年第5期24卷 80-84页

作者：季日臣陈尧隆西安理工大学水利水电学院

根据大型多纵梁矩形渡槽槽身结构及其受力特点,研究了其结构静力计算的方法,并对梁格法、三维实体单元有限元法和实用空间分析法进行了对比。作者提出的实用空间分析法,简单实用又便于配筋,计算结果的精度能满足工程设计的要求。结构设... 详细信息

根据大型多纵梁矩形渡槽槽身结构及其受力特点,研究了其结构静力计算的方法,并对梁格法、三维实体单元有限元法和实用空间分析法进行了对比。作者提出的实用空间分析法,简单实用又便于配筋,计算结果的精度能满足工程设计的要求。结构设计时可采用作者提出的实用空间法计算内力并进行配筋设计,用三维实体有限元方法校核主要受力断面的应力状态。

关键词：水工结构结构计算实用空间分析法有限元渡槽

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International clinical practice guideline of Chinese medicine - Gout (SCM73–2024)

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Clinical Traditional Medicine and Pharmacology 2024年第4期5卷 1-8页

作者： Xuanlin Li Lin Huang Zhijun Xie yaolong chen chengping Wen School of Basic Medical Science Zhejiang Chinese Medical UniversityHangzhou 31006ZhejiangChina Key Laboratory of Chinese Medicine Rheumatology of Zhejiang Province Zhejiang Chinese Medical UniversityHangzhou 31006ZhejiangChina School of Basic Medical Sciences Lanzhou UniversityLanzhou 730030GansuChina World Health Organization Collaborating Center for Guideline Implementation and Knowledge Translation Lanzhou UniversityLanzhou 730030GansuChina

Background:Gout is a metabolic rheumatic disease that seriously endangers human health,with a relatively high prevalence and disability rate *** international clinical practice guidelines provide recommendations from the diagnosis,treatment,and management of *** increasing influence of Chinese medicine globally raises the attention of adopting Chinese medicine prevention and treatment *** Chinese medicine or integrated traditional Chinese and Western medicine guidelines for gout have provide recommendations from the view of disease combined with syndrome,however,recommendations on the specific Chinese medicine prevention and treatment regimens at different stages are ***:To this end,this document summarized Chinese medicine regimens and recommendation opinions for diagnosing and treating gout of different stages after thoroughly considering the clinical practice of Chinese medicine in diagnosing and treating gout,collecting and evaluating evidence on Chinese medicine’s efficacy on gout,and consulting experts at home and abroad,hoping to provide reference for Chinese medicine and integrated Chinese and Western medicine clinicians worldwide in gout diagnosis and ***:This document specifies the terms and definitions of gout,diagnosis of syndromes,Chinese medicine treatment regimens,***:This document is a declarative document based on existing research evidence and specific methods,instead of a standard or norm for medical *** clinical practice,physicians can refer to this document to formulate personalized treatment plans based on the specific conditions of patients.

关键词： Gout Recommendations Chinese medicine Guideline

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Tuberculosis screening among children and adolescents in China:insights from a mathematical model

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Intelligent Medicine 2023年第3期3卷 157-163页

作者： Janne Estill Yangqin Xu Shouyuan Wu Lidong Hu Nan Yang Shu Yang yaolong chen Guobao Li Evidence-Based Medicine Center School of Basic Medical SciencesLanzhou UniversityLanzhouGansu 730000China Institute of Global Health University of GenevaGenevaSwitzerland School of Public Health Lanzhou UniversityLanzhouGansu 730000China Department of Rheumatology and Immunology The First Medical CenterChinese PLA General HospitalBejing 100853China College of Medical Information Engineering Chengdu University of Traditional Chinese MedicineChengduSichuan 610000China Research Unit of Evidence-Based Evaluation and Guidelines Chinese Academy of Medical Sciences(2021RU017)School of Basic Medical SciencesLanzhou UniversityLanzhouGansu 730000China Lanzhou University Institute of Health Data Science LanzhouGansu 730000China WHO Collaborating Centre for Guideline Implementation and Knowledge Translation LanzhouGansu 730000China Department of Lung Disease Shenzhen Third People's HospitalThe Second Affiliated HospitalSouthern University of Science and TechnologyShenzhen Guangdong 518112China

Background Tuberculosis(TB)continues to be prevalent in China also among children and adolescents in *** built a dynamic mathematical model for TB transmission in China,and applied it to compare the epidemic trends 2021–2030 under a range of screening interventions focusing on children and *** We developed a dynamic mathematical model with a flexible *** model can be applied either stochastically or deterministically,and can encompass arbitrary age structure and resistance *** the present version,we used the deterministic version excluding resistance but including age structure with six groups:0–5,6–11,12–14,15–17,18–64,and 65 years and *** parameterized the model by literature data and fitting it to case and death estimates provided by the World Health *** compared the new TB cases and TB-related deaths in each age group over the period 2021–2030 in 10 scenarios that involved intensified screening of particular age groups of children,adolescents,or young adults,or decreased or increased diagnostic accuracy of the *** Screening the entire age class of 18-year-old persons would prevent 517,000 TB cases and 14,600 TB-related deaths between years 2021 and 2030,corresponding to 6.6%and 5.5%decrease from the standard of care projection,*** screening of children aged 6–11 and,to a lesser extent,0–5 years,also reduced TB incidence and mortality,particularly among children of the respective ages but also in other age *** contrast,intensified screening of adolescents did not have a major *** with a simpler and less accurate method resulted in worsened outcomes,which could not be offset by more intensive *** accurate screening and better sensitivity to detect latent TB could prevent 2.3 million TB cases and 68,500 TB deaths in the coming 10 *** Routine screening in schools can efficiently reduce the burden of TB in *** should be intensifie

关键词： Tuberculosis China Children and adolescents Mathematical model Screening

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脑卒中中西医结合防治指南(2023版)

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中国全科医学 2025年第5期28卷 521-533页

作者：倪小佳林浩罗旭飞邝卓然刘云兰郭建文陈耀龙蔡业峰脑卒中中西医结合防治指南工作组广东省中医院、广东省中医药科学院、广州中医药大学第二临床医学院广东省广州市510120 广东省中医急症研究重点实验室广东省广州市510120 省部共建中医湿证国家重点实验室广东省广州市510120 兰州大学基础医学院循证医学中心甘肃省兰州市730000 兰州大学GRADE中心甘肃省兰州市730000 世界卫生组织指南实施与知识转化合作中心甘肃省兰州市730000 兰州大学公共卫生学院甘肃省兰州市730000 不详

近年来我国脑卒中疾病负担仍持续增长,同时目前中西医结合治疗脑卒中领域涌现出许多新的临床证据。为更好地指导中西医结合防治脑卒中的临床实践,本工作组在《中西医结合脑卒中循证实践指南(2019)》的基础上,开展指南更新必要性评估与... 详细信息

近年来我国脑卒中疾病负担仍持续增长,同时目前中西医结合治疗脑卒中领域涌现出许多新的临床证据。为更好地指导中西医结合防治脑卒中的临床实践,本工作组在《中西医结合脑卒中循证实践指南(2019)》的基础上,开展指南更新必要性评估与临床问题遴选,确定了需要更新的12个临床问题,并以《脑卒中中西医结合防治指南》在中华中医药学会申请立项。参考最新的国内外临床实践指南,基于研究证据的系统检索与客观评价,结合我国中西医临床专家的经验,经过工作组的充分讨论及广泛征求意见,最终形成18条推荐意见,以期为各级医疗机构的医务工作者提供科学、具体的指导,促进中西医结合治疗脑卒中的规范应用,从而降低脑卒中的死亡率、复发率、残疾率。

关键词：脑卒中中西医结合循证实践指南

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破除公司政治对人员招聘的影响

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中国人力资源开发 2009年第2期26卷 28-30页

作者：陈耀龙仰恩大学

公司政治客观存在于企业之中,影响着企业管理的方方面面。本文探讨公司政治对企业内外部招聘决策的影响,以期提高企业的招聘成功率。

关键词：人才招聘公司政治人力资源管理

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水体晃荡作用对渡槽横向抗震影响的研究

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水力发电学报 2007年第6期26卷 30-34页

作者：季日臣夏修身陈尧隆兰州交通大学土木工程学院兰州730070 西安理工大学水利水电学院西安710048

本文建立考虑槽内水体与渡槽槽身流固耦合的横向地震响应计算模型,分析槽内水体晃荡对渡槽结构横向抗震的影响,并对某大型渡槽进行多工况地震时程响应计算。计算结果表明:在地震作用下,渡槽槽内大质量水体对渡槽的横向地震响应有较大的... 详细信息

本文建立考虑槽内水体与渡槽槽身流固耦合的横向地震响应计算模型,分析槽内水体晃荡对渡槽结构横向抗震的影响,并对某大型渡槽进行多工况地震时程响应计算。计算结果表明:在地震作用下,渡槽槽内大质量水体对渡槽的横向地震响应有较大的影响,但水体的晃荡作用减小水体自身的地震反应,若将水体视为刚体,质量全部附加到槽体上,将严重地夸大水的地震惯性力作用;在渡槽槽身断面选择时应考虑槽身分厢对墩身抗震的影响,以减小地震力。

关键词：水工结构地震响应流固耦合水体晃荡槽身布置

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Letters for "Prospects for the future of clinical efficacy evaluation of traditional Chinese Medicine—Emphasis on original theory and clinical practice"

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TMR Modern Herbal Medicine 2020年第1期3卷 50-54页

作者： yaolong chen Kehu Yang Xinfeng Guo Darong Wu Ling Zhao Bo Li Evidence Based Medicine Centre of Lanzhou University GansuChina Beijing Hospital of Traditional Chinese Medicine Capital Medical UniversityBeijing Institute of Traditional Chinese MedicineBeijingChina 不详

Editorial Note:On January 1,2020,we published an online comment,titled“Prospects for the future of clinical efficacy evaluation of traditional Chinese medicine——Emphasis on original theory and clinical practice”,which focuses on the evaluation of traditional Chinese *** the article was published,it attracted the attention of some scholars,who discussed with the editorial department by *** relevant letters are organized as follows for further communication and discussion by readers.

关键词： theory letters clinical

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