检索结果-南通市图书馆

中国医学教育技术 2016年第6期30卷 685-688页

作者：史霖周晓勃雷艳君刘如意西安交通大学基础医学院病原生物学与免疫学系西安710061

基于微信在大学生中使用的普遍性及其在移动教学中的优势,文章分析了微信平台应用于医学免疫学实验教学的可行性,并对利用微信平台辅助教学的方法和策略进行了研究,希望通过微信辅助教学提高学生学习的主动性和积极性,提高医学免疫学实... 详细信息

基于微信在大学生中使用的普遍性及其在移动教学中的优势,文章分析了微信平台应用于医学免疫学实验教学的可行性,并对利用微信平台辅助教学的方法和策略进行了研究,希望通过微信辅助教学提高学生学习的主动性和积极性,提高医学免疫学实验课教学质量。

关键词：微信医学免疫学实验课

柴达木盆地周缘镍矿床(点)成矿特征及找矿潜力分析

在线全文

学校读者我要写书评

暂无评论

中国地质调查 2017年第4期4卷 9-16页

作者：雷延军黄朝晖刘长财张开成王红英雷爱全青海省核工业地质局西宁810008 青海省国土资源博物馆西宁810001

近年来,在青海柴达木盆地周缘(简称柴周缘)地区陆续发现了一系列与超基性岩体有关的镍矿床(点)。为此,根据已有地质矿产资料,通过综合研究分析,总结了柴周缘地区镍铜硫化物矿床的成矿地质背景、空间分布及成矿特征;在柴周缘地区划分出... 详细信息

近年来,在青海柴达木盆地周缘(简称柴周缘)地区陆续发现了一系列与超基性岩体有关的镍矿床(点)。为此,根据已有地质矿产资料,通过综合研究分析,总结了柴周缘地区镍铜硫化物矿床的成矿地质背景、空间分布及成矿特征;在柴周缘地区划分出柴北缘高压混杂岩带、欧龙布鲁克陆块、柴南缘昆北裂陷槽及柴南缘昆中岩浆弧带等4个镍成矿区带,并重点分析了各成矿区带的镍矿床(点)成矿特征;在此基础上,总结了柴周缘镍矿床的幔源岩浆深部熔离和上侵贯入的成矿模式及含矿岩石风化露头和物化探异常等找矿标志,圈定出柴北缘高压混杂岩带西段的阿尔金南缘茫崖镇—冷湖镇、欧龙布鲁克陆块东段的乌兰、柴南缘昆北裂陷槽西段的冰沟南和东段的夏日哈木西北,以及柴南缘昆中岩浆弧带中段的夏日哈木—托拉海南和白日其利—哈图6处镍矿找矿潜力区。所取得的地质找矿效果,对推动整个柴周缘地区与超基性岩体有关的镍矿的勘查工作具有重要意义。

关键词：镍矿产成矿特征找矿潜力柴周缘

Higher-order properties and extensions for indirect MRAC and APPC of linear systems

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第4期67卷 218-238页

作者： yanjun ZHANG Zhipeng ZHANG Jian SUN lei WANG Kangkang ZHANG National Key Lab of Autonomous Intelligent Unmanned Systems Beijing Institute of Technology Beijing Institute of Technology Chongqing Innovation Center College of Control Science and Engineering Zhejiang University Department of Electrical and Electronic Engineering Imperial College London KIOS Research and Innovation Center of Excellence University of Cyprus

Recently, a reference derived some new higher-order output tracking properties for direct model reference adaptive control(MRAC) of linear time-invariant(LTI) systems: limt→∞ e~((i))(t) = 0, i = 1,..., n~*-1, where n~* and e~((i))(t) denote the relative degree of the system and the i-th derivative of the output tracking error, respectively. However, a naturally arising question involves whether indirect adaptive control(including indirect MRAC and indirect adaptive pole placement control) of LTI systems still has higher-order tracking properties. Such properties have not been reported in the literature. Therefore, this paper provides an affirmative answer to this question. Such higher-order tracking properties are new discoveries since they hold without any additional design conditions and, in particular, without the persistent excitation condition. Given the higher-order properties, a new adaptive control system is developed with stronger tracking features.(1) It can track a reference signal with any order derivatives being unknown.(2) It has higher-order exponential or practical output tracking properties.(3) Finally, it is different from the usual MRAC system, whose reference signal’s derivatives up to the n~* order are assumed to be known. Finally, two simulation examples are provided to verify the theoretical results obtained in this paper.

关键词： higher-order tracking indirect adaptive control model reference adaptive control adaptive pole placement control

青海洪水河东地区石墨矿床地质特征及成因探讨

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

青海大学学报（自然科学版） 2015年第6期33卷 81-84页

作者：辛军强杨延景赵生辉雷延军何虎虎青海省核工业地质局青海西宁810016

文中以洪水河、细细特郭勒、口口尔图地区圈定的16条石墨矿体为依托,从矿体赋矿层位、空间展布、矿体特征、矿石特征等方面着手,浅析区内石墨矿床的地质背景、矿床成因、成矿规律及找矿前景,为寻找区域变质岩型石墨矿床提供基础资料,以... 详细信息

文中以洪水河、细细特郭勒、口口尔图地区圈定的16条石墨矿体为依托,从矿体赋矿层位、空间展布、矿体特征、矿石特征等方面着手,浅析区内石墨矿床的地质背景、矿床成因、成矿规律及找矿前景,为寻找区域变质岩型石墨矿床提供基础资料,以期引起对洪水河东地区石墨矿床勘查的重视。

关键词：石墨矿大理岩地质特征矿床成因洪水河东

大水沟地区金多金属矿成矿地质背景及找矿远景分析

在线全文

学校读者我要写书评

暂无评论

青海大学学报（自然科学版） 2014年第1期32卷 37-41,94页

作者：雷延军韩德义石毅黄军杨延景关全成青海省核工业地质局青海西宁810008

通过几年的野外勘查工作,大水沟矿区在找矿方面取得了较为显著的成果,矿区内圈定了2处水系沉积物综合异常,通过异常查证,目前发现了3条矿化蚀变带,圈出金矿体5条、铜矿体1条、钼矿化体1条、铅锌银矿化脉1条。其中金矿体主要赋存于蚀变... 详细信息

通过几年的野外勘查工作,大水沟矿区在找矿方面取得了较为显著的成果,矿区内圈定了2处水系沉积物综合异常,通过异常查证,目前发现了3条矿化蚀变带,圈出金矿体5条、铜矿体1条、钼矿化体1条、铅锌银矿化脉1条。其中金矿体主要赋存于蚀变的碎裂岩中,对发现的矿体沿走向进行了槽探揭露、钻探深部验证控制,矿体沿走向、倾向具一定延伸,深部品位变富,与邻近五龙沟金矿田具有相似的成矿地质背景及成矿规律,说明该矿区具有较大的找矿空间。

关键词：大水沟矿化蚀变带金多金属构造蚀变岩型找矿远景

血清白细胞介素-2和白细胞介素-4在糖尿病肾病早期诊断中的意义

在线全文

学校读者我要写书评

暂无评论

安徽医药 2018年第4期22卷 638-641页

作者：刘静雷艳君丁凤娇刘婕荆成宝安康市中心医院检验科陕西安康725000 西安交通大学医学院陕西西安 710018

目的分析血清白细胞介素-2(IL-2)和白细胞介素-4(IL-4)在糖尿病肾病(DN)早期诊断中的价值。方法选取DN患者60例(DN组)、糖尿病患者60例(DM组)和健康体检者60例(对照组),检测其血清IL-2和IL-4水平。结果各组在性别、年龄、体质量指数(BMI... 详细信息

目的分析血清白细胞介素-2(IL-2)和白细胞介素-4(IL-4)在糖尿病肾病(DN)早期诊断中的价值。方法选取DN患者60例(DN组)、糖尿病患者60例(DM组)和健康体检者60例(对照组),检测其血清IL-2和IL-4水平。结果各组在性别、年龄、体质量指数(BMI)、收缩压(SBP)、舒张压(DBP)上比较,均差异无统计学意义(P>0.05)。DN组患者尿肌酐(UCr)、血肌酐(SCr)均高于其他两组,均差异有统计学意义(P<0.05)。DN组患者IL-2水平明显低于DM组和对照组,而IL-4水平却高于DM组和对照组。IL-2和IL-4单独作为标志物诊断急性肾衰竭(AKI)时,ROC曲线下面积(AUC)分别为:0.833和0.952(P<0.01),二者联合诊断时,诊断率为100%。结论 IL-2和IL-4联合检测可以相互弥补,提高DN的诊断准确率,有助于临床工作者早期发现DN,提供有效的干预措施,减少病死率。

关键词：糖尿病肾病白细胞介素-2 白细胞介素-4

自我管理项目干预对PICC置管的鼻咽癌患者及家属的自我护理能力及焦虑状态的影响

在线全文

学校读者我要写书评

暂无评论

中国现代医生 2021年第6期59卷 178-181页

作者：雷彦俊蒋慧玲吕魏潇刘泽梅浙江省丽水市中心医院放疗科浙江丽水323000

目的探讨自我管理项目干预在经外周静脉穿刺中心静脉置管(PICC)下鼻咽癌(NPC)家庭中的应用价值。方法选择2018年2月至2020年2月在我院行PICC置管的70例NPC患者,其中35例患者及其家属均接受常规的健康宣教(对照组),35例患者及其家属则实... 详细信息

目的探讨自我管理项目干预在经外周静脉穿刺中心静脉置管(PICC)下鼻咽癌(NPC)家庭中的应用价值。方法选择2018年2月至2020年2月在我院行PICC置管的70例NPC患者,其中35例患者及其家属均接受常规的健康宣教(对照组),35例患者及其家属则实施自我管理干预(观察组),比较两组患者对PICC相关知识的掌握情况、患者及家属的自我护理能力、负面情绪及并发症情况。结果干预后,观察组患者对PICC相关知识掌握程度明显高于对照组(P<0.05);观察组各项自我护理能力评分均明显高于对照组(P<0.05);且观察组干预后的焦虑状态评分明显低于对照组(P<0.05);观察组PICC并发症的总发生率明显低于对照组(P<0.05)。结论将自我管理项目干预应用于PICC置管下的鼻咽癌家庭中,可有效提高患者家庭对相关知识的掌握程度及自我护理能力,同时缓解其焦虑情况,且对各项并发症的发生也具有较好的预防效果。

关键词：经外周静脉穿刺中心静脉置管自我管理项目干预鼻咽癌自我护理能力负面情绪

Improving the Weld Formation and Mechanical Properties of the AA-5A06 Friction Pull Plug Welds by Axial Force Control

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2020年第6期33卷 828-838页

作者： Jinyong Gao Lijun Yang lei Cui Peng Lu Jun Yang yanjun Gao Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Capital Aerospace Machinery Corporation Beijing 100044China

In the present study, the weld formation and mechanical properties of the AA-5A06 friction pull plug welded(FPPW) joints were improved by controlling the axial force history. Several defect-free FPPW joints were made successfully by using the welding parameters of 15–20 k N/s axial loading rate, 20–30 k N axial welding force and 6–7 mm axial feeding displacement. The results indicated that using higher axial loading rate and axial welding force produced more stable heat generation and shorter frictional heating time between the frictional interface. In this case, the plastic flow of the materials around the hole could be further improved since the axial feeding displacement of the plug was increased. The maximum ultimate tensile strength(UTS) and elongation of the FPPW 5A06 joints were 314 MPa and 4.8%, respectively. The thermal mechanically affect zone(TMAZ) had the lowest hardness value throughout the joint and was found as the fracture location to all the tensile samples. The softening of TMAZ was mainly caused by the weakening of the cold work hardening and the coarsening of grains.

关键词： Friction pull plug welding Parameter optimization Microstructures Mechanical properties

MSADCN:Multi-Scale Attentional Densely Connected Network for Automated Bone Age Assessment

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第2期78卷 2225-2243页

作者： yanjun Yu lei Yu Huiqi Wang Haodong Zheng Yi Deng College of Computer and Information Science Chongqing Normal UniversityChongqing401331China College of Mathematics and Statistics Chongqing UniversityChongqing401331China

Bone age assessment(BAA)helps doctors determine how a child’s bones grow and develop in clinical *** BAA methods rely on clinician expertise,leading to time-consuming predictions and inaccurate *** deep learning-based BAA methods feed the extracted critical points of images into the network by providing additional *** operation is costly and *** address these problems,we propose a multi-scale attentional densely connected network(MSADCN)in this *** constructs a multi-scale dense connectivity mechanism,which can avoid overfitting,obtain the local features effectively and prevent gradient vanishing even in limited training ***,MSADCN designs multi-scale structures in the densely connected network to extract fine-grained features at different ***,coordinate attention is embedded to focus on critical features and automatically locate the regions of interest(ROI)without additional *** addition,to improve the model’s generalization,transfer learning is applied to train the proposed MSADCN on the public dataset IMDB-WIKI,and the obtained pre-trained weights are loaded onto the Radiological Society of North America(RSNA)***,label distribution learning(LDL)and expectation regression techniques are introduced into our model to exploit the correlation between hand bone images of different ages,which can obtain stable age *** experiments confirm that our model can converge more efficiently and obtain a mean absolute error(MAE)of 4.64 months,outperforming some state-of-the-art BAA methods.

关键词： Bone age assessment deep learning attentional densely connected network muti-scale

Resid Contact Cracking and Coke Gasification Integrated Technology

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2021年第1期23卷 48-52页

作者： Li yanjun Zhang Shuhong Ren lei Shen Haiping Wu lei Wang Xieqing SINOPEC Research Institute of Petroleum Processing Beijing 100083 SINOPEC Engineering Incorporation Beijing 100101

In order to utilize petroleum resources efficiently and greenly,and solve the problems of high coke yield,highsulfur coke utilization,and environmental protection concerns in China’s refineries,a resid contact cracking and coke gasification integrated technology is being developed by the Research Institute of Petroleum Processing(RIPP).Based on the three technical characteristics including thin films cracking,partial oxidation,and rapid cracking,this technology not only can reduce the production rate of coke and dry gas formed during the process,but also can increase the liquid ***,the in-situ low-temperature gasification technology is used to solve the clean utilization of high-sulfur petroleum coke,which can play the role of“Utility Island”and is a green and low-carbon technology for low-quality heavy oil upgrading.

关键词： contact cracking coke gasification green low carbon resid