检索结果-南通市图书馆

VIBRATION SUPPRESSION OF A FLEXIBLE PIEZOELECTRIC BEAM USING BP NEURAL NETWORK CONTROLLER

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2012年第4期25卷 417-428页

作者： Zhicheng Qiu xiangtong zhang Chunde Ye School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China

This paper aims at modeling and developing vibration control methods for a flexible piezoelectric beam. A collocated sensor/actuator placement is used. Finite element analysis （FEA） method is adopted to derive the dynamics model of the system. A back propagation neural network （BPNN） based proportional-derivative （PD） algorithm is applied to suppress the vibration. Simulation and experiments are conducted using the FEA model and BPNN-PD control law. Experimental results show good agreement with the simulation results using finite element modeling and the neural network control algorithm.

关键词： flexible piezoelectric beam active vibration control neural network finite element analysis

Sb^(3+)and Sm^(3+)co-doped lead-free Cs_(2)NaInCl_(6)double perovskite nanocrystals for single-component cold white emitter

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第9期42卷 1646-1651,I0001页

作者： Biao Zhou xiangtong zhang Ranran Hu Ruixue Hou William W.Yu Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Centre for High-Efficiency Display and Lighting TechnologySchool of Materials and EngineeringCollaborative Innovation Centre of Nano Functional Materials and ApplicationsHenan UniversityKaifeng475000China School of Chemistry and Chemical Engineering Shandong UniversityJinan250100China

Metal halide perovskites exhibit promising prospect in light-emitting diodes,solar cells,photodetectors and ***,the workhorse of metal halide perovskites relies on toxicity lead element,which severely damages human body and *** lead-free perovskites,Cs_(2)NaInCl_(6)double perovskite is one of the most promising candidates because of its great stability and easy synthesis,but suffers inadequate optical ***,we doped Sb^(3+)and Sm^(3+)into Cs_(2)NaInCl_(6)nanocrystals by a hot injection ***_(2)NaInCl_(6):Sb^(3+)exhibits blue emission at 447 ***_(2)NaInCl_(6):Sm^(3+),Sb^(3+)nanocrystals simultaneously generate the blue emission of Sb^(3+)and the multiple emissions of Sm^(3+)at 565,602,650 and 710 *** the increase of Sm^(3+)feed ratio,the emission color of Cs_(2)NaInCl_(6):Sm^(3+),Sb^(3+)gradually moves to cold white region at(0.27,0.28)in CIE chromaticity diagram and correlated color temperature of 11840 *** work shows the potential application of Cs_(2)NaInCl_(6):Sm^(3+),Sb^(3+)nanocrystals as a single-component cold white emitter.

关键词： Lead-free Double perovskites Single component White emitter Doping Rare earths

A PROSENCEPHALIC NEURONAL CIRCUIT POSSIBLY INVOLVED IN MODULATION OF PAIN

在线全文

学校读者我要写书评

暂无评论

Science in China,Ser.B 1984年第1期27卷 48-60页

作者：张香桐何淑舫陈国光 Shanghai Brain Research Institute Academia Sinica

Both anatomical and physiological studies in cats substantiated the existence of a tha-lamus-cortex-thalamus neuronal circuit in which neurons in the centre median send fibers towide areas of the cerebral cortex and the cerebral cortex, the motor cortex in particular, maysend the fibers back to the parafascicular nucleus. The cortical neurons concerned tend todischarge spontaneously and constantly. These spontancous discharges can be readily inhib-ited by the corticopetal impulses from the centre median, which itself can be activated bygeneral afferent impulses. On the basis of this observation it is assumdd that constantly dis-charging corticothalamic neurons may exert a tonic excitatory influence on the pain-receivingcenter, parafascicular nucleus, so as to keep it in a state of constant alertness to the tissue-damaging danger signals and that the inhibitory action of the ascending fibers from centremedian would serve to suspend the excitatory action of the cortex on the parafascicular nucleus,resulting in relief of pain. The corticofugal fibers in this forebrain circuit terminating in thecentromedian nucleus may reinforce the inhibitory action of the centromedian neurons so as toinhibit the spotaneous discharges of the cortical neurous. A self-regulating mechanism is thusformed by which a stabilized state of brain excitability can be maintained.

关键词： A PROSENCEPHALIC NEURONAL CIRCUIT POSSIBLY INVOLVED IN MODULATION OF PAIN

RESPONSES OF NEURONS IN PARAFASCICULAR NUCLEUS TO SEVERE RADIANT HEAT STIMULATION

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science in China,Ser.B 1983年第4期26卷 381-385页

作者：张香桐何淑舫赵志奇 Shanghai Brain Research Institute Academia Sinica

On radiant heat stimulation of the sole of the hind foot of rat, the neurons in the parafascicular nucleus of thalamus would not respond until the skin temperature was raised to 45℃. If there had been existing discharges in these neurons prior to the test, these discharges may be inhibited by the innocuous heat stimulus at temperatures below 45℃. The warmth, or the heat below the innocuous level was unable not only to produce but also to inhibit the nociceptive neuronal discharges incurred by previous nocuous stimulation. This phenomenon is regarded as a manifestation of one of the general principles on which the interpretation of acupuncture analgesia is based.

关键词： RESPONSES OF NEURONS IN PARAFASCICULAR NUCLEUS TO SEVERE RADIANT HEAT STIMULATION

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

创伤性轴索损伤的病理机制

中华创伤杂志 2000年第10期16卷 594-595页

作者：张相彤隋立森哈尔滨医科大学第一临床医学院神经外科 150001

轴索损伤是创伤性脑损伤(traumatic brain injury,TBI) 基本病理过程之一[1].传统观念认为脑创伤同时轴索撕裂,轴索收缩或排出轴浆形成反应性轴索肿胀,称为收缩球(retraction ball).而最近的研究表明在大多数轴索损伤中,轴索断裂不是立... 详细信息

轴索损伤是创伤性脑损伤(traumatic brain injury,TBI) 基本病理过程之一[1].传统观念认为脑创伤同时轴索撕裂,轴索收缩或排出轴浆形成反应性轴索肿胀,称为收缩球(retraction ball).而最近的研究表明在大多数轴索损伤中,轴索断裂不是立即发生,而是一个延迟过程,大约伤后4～24 h之间发生.这个过程被称为继发性轴索断裂(secondary axotomy),是轴索损伤的主要形式.目前对这一过程病理机制尚不清楚.有人认为局部轴膜功能障碍是导致离子内流,从而激发轴浆细胞骨架降解是关键所在;也有人认为创伤直接引起轴索内细胞骨架损伤,从而使轴浆运输障碍.因此笔者着重介绍目前轴膜(axolemma)、微管(microtubule)、神经微丝(neurofilament,NF)与轴索损伤关系的研究进展,同时对继发性轴索断裂的可能机制作一概述.

关键词：创伤性轴索损伤病理机制轴索结构轴膜改变

在线全文

学校读者我要写书评

暂无评论

煤炭工业工程建设标准化工作发展成就

工程建设标准化 2024年第7期 66-68页

作者：张祥彤中国煤炭建设协会

引言习近平总书记指出:“把抓好党建作为最大的政绩”。党建引领是一切工作的基石。实践证明,生动活泼、亮点纷呈的党建工作,能够更好地推动党建优势转化为发展优势,党建资源转化为发展资源,党建成果转化为发展成果,党建引领与煤炭行业... 详细信息

引言习近平总书记指出:“把抓好党建作为最大的政绩”。党建引领是一切工作的基石。实践证明,生动活泼、亮点纷呈的党建工作,能够更好地推动党建优势转化为发展优势,党建资源转化为发展资源,党建成果转化为发展成果,党建引领与煤炭行业工程建设标准化各项工作深度融合,对煤炭行业工程建设标准化工作起到强有力的推动作用。

关键词：工程建设标准化党建引领党建工作党建资源成果转化深度融合煤炭行业煤炭工业

浅谈电梯定期检验如何开展125%载荷制动试验

在线全文

学校读者我要写书评

暂无评论

中国电梯 2019年第7期30卷 44-45页

作者：张向桐武汉市特种设备监督检验所武汉430014

国家质检总局在2017年对电梯检规进行了修改,在2017年10月1日之后,乘客电梯在定检检验中,每5年需进行一次125%载荷制动试验(以下简称制动试验)。这是第一次把制动试验纳入定期检验中,到现在制动试验工作已经开展一年多,试验的具体检验... 详细信息

国家质检总局在2017年对电梯检规进行了修改,在2017年10月1日之后,乘客电梯在定检检验中,每5年需进行一次125%载荷制动试验(以下简称制动试验)。这是第一次把制动试验纳入定期检验中,到现在制动试验工作已经开展一年多,试验的具体检验方法在本文不作为探讨范围,但如何开展相关检验工作,试验过程中需要注意哪些关键点.

关键词：制动试验定期检验超载装置

PERIODIC EXCITABILITY CHANGES IN MEDIAL THALAMIC NUCLEI

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1981年第1期26卷 85-90页

作者：张香桐罗弗荪袁钧苏 Shanghai Institute of Physiology Academia Sinica

In the course of a study 28 years ago on the potentiation effect of background illumination on the cortical potential evoked by stimulation of the lateral geniculate body, it was found that the evoked potential often showed a spontaneous periodic variation in amplitude with each cycle of the periodicity lasting for 10—12 sec. This neriodie excitabilitv change was considered at that time as a phenomenon

关键词： stimulation cortical potentiation illumination periodicity spontaneous lasting evoked neuronal reflex

个体化护理对高血压脑出血微创手术患者遵医行为及护理满意度的影响

在线全文

学校读者我要写书评

暂无评论

中国医药导报 2017年第28期14卷 159-161,169页

作者：刘欣张相彤哈尔滨医科大学附属第一医院急诊脑外科黑龙江哈尔滨150001

目的探究与分析个体化护理对高血压脑出血微创手术患者遵医行为及护理满意度的影响。方法选取哈尔滨医科大学附属第一医院2015年1月~2017年1月接受微创手术治疗的高血压脑出血患者90例,采取随机数字表法将其分为对照组和观察组,每组各4... 详细信息

目的探究与分析个体化护理对高血压脑出血微创手术患者遵医行为及护理满意度的影响。方法选取哈尔滨医科大学附属第一医院2015年1月~2017年1月接受微创手术治疗的高血压脑出血患者90例,采取随机数字表法将其分为对照组和观察组,每组各45例。对照组给予常规护理,观察组给予个体化护理,两组均连续护理1个月。比较两组患者的遵医行为、护理满意度以及并发症发生率。结果观察组总遵医嘱率(93.33%)明显高于对照组(75.56%),差异有统计学意义(P<0.05)。观察组护理满意度(91.11%)明显高于对照组(73.33%),差异有统计学意义(P<0.05)。观察组并发症发生率(8.89%)低于对照组(22.22%),差异有统计学意义(P<0.05)。结论个体化护理能改善高血压脑出血微创手术患者的遵医行为,提高护理满意度,降低并发症发生率,安全性较高。

关键词：个体化护理高血压脑出血微创手术遵医行为护理满意度