检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

特定场景下的电动轮椅自主跟随与避障系统

传感器与微系统 2024年第5期43卷 62-66页

作者：张健如张从鹏曾顺杨正富北方工业大学机械与材料工程学院北京100144

面向老年和残障人群出行需求,本文在自主研发的轮椅基础上,提出了一种具有补偿机制的电动轮椅自主跟随与避障双层结构控制系统。外层采用最小二乘优化的三边定位算法实现定位。当跟随信号消失后,引入补偿目标点,实现对电动轮椅跟随速度... 详细信息

面向老年和残障人群出行需求,本文在自主研发的轮椅基础上,提出了一种具有补偿机制的电动轮椅自主跟随与避障双层结构控制系统。外层采用最小二乘优化的三边定位算法实现定位。当跟随信号消失后,引入补偿目标点,实现对电动轮椅跟随速度大小的控制。内层利用模糊控制算法实现多传感器信息融合,有效解决了电动轮椅跟随与避障过程中的方向控制问题。基于开发的电动轮椅控制器完成了多种跟随和避障测试实验。实验结果表明:在跟随速度1.3 m/s,跟随距离2~2.5 m的基础上,电动轮椅能够实现平滑地速度控制并跟随目标。在最大1.6 m/s行驶速度下,电动轮椅能够对可能发生碰撞的移动障碍物实现急停,安全距离大于0.2 m,保证了在移动跟随中的安全性要求。

关键词：自主跟随避障模糊控制嵌入式控制器补偿机制

维普期刊数据库博看期刊

Role of ranulas in early diagnosis of Sjögren’s syndrome: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第20期9卷 5701-5708页

作者： Na Chen Da-shun zeng Yu-Tong Su Department of Endocrine and Metabolic Diseases Shanghai Institute of Endocrine and Metabolic DiseasesRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Shanghai National Clinical Research Center for metabolic Diseases Key Laboratory for Endocrine and Metabolic Diseases of the National Health Commission of the PR ChinaShanghai National Center for Translational MedicineShanghaiChina Department of Oral Surgery The Third Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325200Zhejiang ProvinceChina Department of Rheumatology and Immunology Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China

BACKGROUND Although the presentations of Sjögren’s syndrome(SS)are variable,ranging from mild dryness to wider systemic involvement,ranulas as early clinical signs were scarcely ***,we present an adult patient with SS,who developed a unilateral simple ranula and was diagnosed primary SS 3 years *** also provide a review of cases of SS and ranulas from 1980 to *** SUMMARY A 22-year-old girl was found to have a left painless floor-of-mouth lesion 3 years ago,without obvious trauma or *** diagnosis of a unilateral(left)simple ranula was made,and the ranula was surgically *** 3 years after the ranula surgery,she developed acute lymphadenectasis in unilateral parotid twice without inducement,and ultrasonic examination revealed diffuse lesions in bilateral parotids and submandibular glands,which strongly suggested *** tests and the unstimulated whole saliva flow rate confirmed the SS *** Our study underlines that ranulas are early clinical signs of *** early diagnosis and early intervention of SS are important to obtain better outcomes,our findings underline the need for histopathological test after sublingual adenectomy and imaging detection of exocrine glands for the patients with ranulas.

关键词： Sjögren’s syndrome Ranulas Early diagnosis Parotitis Case report

How the radial gap affects the runner’s hydrodynamic damping characteristic of a pump-turbine:A physical experiment on a rotating disc

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2023年第4期35卷 736-745页

作者： Yong-shun zeng Xin Qi Mian-mian Bai Ling-jiu Zhou Zhi-feng Yao College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China BAPTEEC LTD Beijing100176China Shanxi Province Institute of Water Resources and Electric Power Investigation and Design Xi’an710001China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System Beijing100083China

Clarifying how radial gap affects the vibration characteristic of a disc-like structure is of importance in engineering applications,such as in evaluating the operational stability of a runner of a pump *** the present investigation,the runner is simplified as a disc,and a physical experiment is designed on it with variable radial gaps to measure the vibration characteristics,especially by considering *** frequency peaks for the diametrical mode are generated due to the rotation,and those with lower and higher frequencies are defined as positive and negative modes,*** frequency difference between positive and negative modes increases linearly with the increasing rotating speed,and a linear function is captured to describe the relationship between natural frequency and rotating *** the radial gap,its increase causes a slight increase in the natural frequencies but results in a significant reduction in the hydrodynamic damping *** in the smaller radial gap conditions,such as when the relative radial gap increases from 0.67%to 3.3%,the reduction in hydrodynamic damping ratio reaches 31.52%.From the perspective of suppressing the resonance amplitude,reducing the radial gap of a runner is recommended due to the mechanism of increasing hydrodynamic damping.

关键词： Rotating disc radial gap rotating speed natural frequency hydrodynamic damping

Effect of Annealing Temperature on the Shape Memory Properties of Cold-Rolled Dual-Phase Ni-Mn-Ga-Gd Alloy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第11期28卷 1403-1406页

作者： Xin Zhang Qing-Suo Liu Xian-shun zeng Jie-He Sui Wei Cai Ai-Lian Liu School of Materials Science and Engineering Tianjin University of Technology National Key Laboratory Precision Hot Processing of Metals Harbin Institute of Technology College of Material Science and Engineering Heilongjiang University of Science and Technology

The influence of annealing temperature on the shape memory effect （SME） and recovery ratio of cold-rolled dual-phase Ni58Mn25Ga16.9Gdo.1 high-temperature shape memory alloy were investigated. The results showed that the SME can be improved by appropriate annealing. SME of 6.0% and recovery ratio of 98% were observed in the rolled alloy at 550 ℃ annealing, which were larger than that of the samples annealed at other temperatures. The annealing temperature was in between the recrystallization temperatures of the martensite and 7 phase, which leads to the work-hardening state of 7 phase kept unchanged during annealing process, and therefore, the critical slip stress of y phase increased. Thus, the plastic deformation of ~ phase reduced during the compression process, and the SME increased.

关键词： Shape memory alloys Recrystallization Cold rolling Ni-Mn-Ga

Numerical studies of the hydrodynamic damping of a vibrating hydrofoil in torsional mode

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2021年第2期33卷 347-360页

作者： Yong-shun zeng Zhi-feng Yao Biao Huang Fu-jun Wang Qin Wu Ruo-fu Xiao Guo-yu Wang College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System Beijing 100083China School of Mechanical and Vehicular Engineering Beijing Institute of TechnologyBeijing 100081China

The vortex-induced vibration may lead to a premature failure of hydraulic mechanical systems,especially under the resonance condition in the torsional *** predict the structural fatigue life,a careful consideration of the dynamic response to the hydraulic excitations is essential in the design *** study focuses on the numerical investigation of the relationship between the flow velocity,the added mass and the hydrodynamic damping,particularly,with respect to a Donaldson-type hydrofoil,vibrating in the first torsional mode.A two-way fluid-structure interaction(FSI)method is used to predict above two *** flow velocity is in the range of 0 m/s-20m/*** evaluate the hydrodynamic damping ratio,an identification method is proposed,based on a modified version of the logarithmic decay *** relative deviations of the simulated natural frequencies and hydrodynamic damping ratios as compared with the experimental data for the first torsional modes,are within 8.1%and 16.6%,*** analysis results show that the added mass coefficient for the first torsional mode is in the range of 1.59-1.86,and is around 44%of that for the first bending *** trends of the boundary layer thickness and the wake width against the reduced velocity are found to be opposite to that of the hydrodynamic damping *** theoretical equation for predicting the hydrodynamic damping ratio is modified,which is shown to be more reliable due to its consideration of the velocity independent hydrodynamic damping phase.

关键词： Torsional mode hydrodynamic damping added mass hydrofoil Donaldson trailing edge

针康法联合健脑醒聪汤治疗缺血性脑卒中后认知障碍患者的疗效观察

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

世界中西医结合杂志 2024年第6期19卷 1207-1211,1217页

作者：冯文锋杨杨冯声旺冼超俊陈璇君曾顺军广东省中西医结合医院广东佛山528200

目的探讨健脑醒聪汤联合针康法治疗缺血性脑卒中后认知障碍患者的临床疗效。方法前瞻性选取2021年1月—2022年12月期间广东省中西医结合医院收治的135例缺血性脑卒中后认知障碍患者作为研究对象,采用随机数字表法分为对照A组、对照B组... 详细信息

目的探讨健脑醒聪汤联合针康法治疗缺血性脑卒中后认知障碍患者的临床疗效。方法前瞻性选取2021年1月—2022年12月期间广东省中西医结合医院收治的135例缺血性脑卒中后认知障碍患者作为研究对象,采用随机数字表法分为对照A组、对照B组和治疗组,每组各45例。对照A组给予奥拉西坦,对照B组给予奥拉西坦+针康法,治疗组给予奥拉西坦+针康法+健脑醒聪汤。均持续治疗4周。观察比较3组患者临床疗效,治疗前后中医证候积分、美国国立卫生研究院卒中(National institute of health stroke scale,NIHSS)评分、Barthel指数(Barthel index,BI)、神经递质[脑源性神经营养因子(Brain-derived neurotrophic factor,BDNF)、胶质纤维酸性蛋白(Glial fibrillary acidic protein,GFAP)]水平。结果治疗后治疗组中医疗效总有效率88.89%(40/45)明显高于对照A组47.73%(21/44)、对照B组70.45%(31/44),差异有统计学意义(P<0.05)。治疗后治疗组西医疗效总有效率91.11%(41/45)高于对照A组52.27%(23/44)、对照B组72.73%(32/44),差异有统计学意义(P<0.05)。治疗4周后3组患者中医证候头痛如刺、智能减退、神情默默、寡言少语评分均较治疗前降低,差异有统计学意义(P<0.05);且治疗组中医证候头痛如刺、智能减退、神情默默、寡言少语评分均明显低于对照A、B组,差异有统计学意义(P<0.05)。治疗4周后3组患者BI评分均较治疗前升高,NIHSS评分均较治疗前降低,差异有统计学意义(P<0.05);且治疗组BI评分明显高于对照A、B组,NIHSS评分明显低于对照A、B组,差异有统计学意义(P<0.05)。治疗4周后3组患血清BDNF水平均较治疗前升高,GFAP水平均较治疗前降低,差异有统计学意义(P<0.05);且治疗组血清BDNF水平明显高于对照A、B组,GFAP水平明显低于对照A、B组,差异有统计学意义(P<0.05)。治疗期间,3组患者血常规、尿常规、心电图、肝肾功能、便常规、血压等安全性指标均无异常改变。结论针康法联合健脑醒聪汤能有效改善缺血性脑卒中后认知障碍患者神经功能,缓解临床症状,提高日常生活能力,增强疗效,机制可能与调节BDNF、GFAP水平有关。

关键词：针康法健脑醒聪汤奥拉西坦缺血性脑卒中认知障碍

在线全文

学校读者我要写书评

暂无评论

纵向合作广告的微分对策模型研究

系统工程理论与实践 2007年第11期27卷 26-33页

作者：傅强曾顺秋重庆大学经济与工商管理学院重庆400044

基于单一制造商与单一零售商所组成的渠道结构,假设零售商广告促销活动对制造商品牌商誉存在消极影响,运用微分对策的方法,分别考察了动态架构中Nash非合作博弈、Stackelberg主从博弈以及协同合作博弈情形下制造商与零售商的最优广告策... 详细信息

基于单一制造商与单一零售商所组成的渠道结构,假设零售商广告促销活动对制造商品牌商誉存在消极影响,运用微分对策的方法,分别考察了动态架构中Nash非合作博弈、Stackelberg主从博弈以及协同合作博弈情形下制造商与零售商的最优广告策略,并对此三种博弈结构下的反馈均衡结果进行了比较分析,发现协同合作博弈情形下的系统利润、制造商和零售商广告投入都要优于非合作博弈情形时的对应值.

关键词：供应链合作广告微分对策反馈均衡

不确定需求下供应链合作广告与订货策略的博弈

在线全文

学校读者我要写书评

暂无评论

系统工程理论与实践 2008年第3期28卷 56-63页

作者：傅强曾顺秋重庆大学经济与工商管理学院重庆400044

基于报童类型产品的二级供应链结构,放宽了市场需求为确定性的假设,引入了订货量这一决策变量,先后考察了Stackelberg主从博弈和Nash合作博弈时制造商与零售商的最优广告策略及零售商的最优订货策略,比较了不同博弈均衡下的策略选择及... 详细信息

基于报童类型产品的二级供应链结构,放宽了市场需求为确定性的假设,引入了订货量这一决策变量,先后考察了Stackelberg主从博弈和Nash合作博弈时制造商与零售商的最优广告策略及零售商的最优订货策略,比较了不同博弈均衡下的策略选择及系统期望利润,探讨了市场需求随机性对制造商与零售商广告投入水平的抑制作用.并利用Nash讨价还价理论对合作利益进行了分配.最后,通过一个数学算例验证了有关结论.

关键词：供应链合作广告订货博弈讨价还价

Emerging roles of non-coding RNAs in colorectal cancer oxaliplatin resistance and liquid biopsy potential

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第1期29卷 1-18页

作者： Zheng-Dong Luo Yi-Feng Wang Yu-Xiao Zhao Long-Chen Yu Tian Li Ying-Jing Fan shun-Jie zeng Yan-Li Zhang Yi Zhang Xin Zhang Department of Clinical Laboratory Qilu Hospital of Shandong UniversityShandong Engineering Research Center of Biomarker and Artificial Intelligence ApplicationJinan 250012Shandong ProvinceChina Department of Clinical Laboratory Shandong Provincial Third HospitalJinan 250012Shandong ProvinceChina

Colorectal cancer(CRC)is one of the most common malignancies of the digestive tract,with the annual incidence and mortality increasing *** chemotherapy is a preferred therapeutic regimen for patients with advanced ***,most patients will inevitably develop resistance to *** studies have reported that non-coding RNAs(ncRNAs),such as microRNAs,long non-coding RNAs,and circular RNAs,are extensively involved in cancer ***,emerging evidence has revealed that ncRNAs mediate chemoresistance to oxaliplatin by transcriptional and post-transcriptional regulation,and by epigenetic *** this review,we summarize the mechanisms by which ncRNAs regulate the initiation and development of CRC chemoresistance to ***,we investigate the clinical application of ncRNAs as promising biomarkers for liquid CRC *** review provides new insights into overcoming oxaliplatin resistance in CRC by targeting ncRNAs.

关键词： Colorectal cancer Non-coding RNAs Oxaliplatin Resistance Liquid biopsy biomarkers