The action mechanism of the work done by the electric field force on moving charges to stimulate the emergence of carrier generation/recombination in a PN junction

It is discovered that the product of the current and the electric field in a PN junction should be regarded as the rate of work(power)done by the electric field force on moving charges(hole current and electron current),which was previously misinterpreted as solely a Joule heating effect.We clarify that it is exactly the work done by the electric field force on the moving charges to stimulate the emergence of non-equilibrium carriers,which triggers the novel physical phenomena.As regards to Joule heat,we point out that it should be calculated from Ohm’s law,rather than simply from the product of the current and the electric field.Based on this understanding,we conduct thorough discussion on the role of the electric field force in the process of carrier recombination and carrier generation.The thermal effects of carrier recombination and carrier generation followed are incorporated into the thermal equation of energy.The present study shows that the exothermic effect of carrier recombination leads to a temperature rise at the PN interface,while the endothermic effect of carrier generation causes a temperature reduction at the interface.These two opposite effects cause opposite heat flow directions in the PN junction under forward and backward bias voltages,highlighting the significance of managing device heating phenomena in design considerations.Therefore,this study possesses referential significance for the design and tuning on the performance of piezotronic devices.

中国视野中“field work”的概念认知——对周代“采风”制度及1990年以来相关文献的梳理与思考

田野工作是民族音乐学学科建立、发展的基石,没有前者就无所谓后者。但学界在"田野工作"这一概念的使用与认知方面,颇有些混乱。总结梳理此领域20年间的重要文论,结合周代的"采风"制度,对其进行定量性的统计与梳理。以期揭示"field work"一词在不同表层概念中的深层文化内涵,统一学界的概念使用与认知,建立相对一致的话语文本。

Effect of propofol on local field potential in rat prefrontal cortex during working memory task

Propofol may produce memory impairment during anesthesia procedure. Local field potentials (LFPs) are used with increasing frequency in recent years to link neural activity to perception and cognition. In this study, effect of propofol on LFPs in rat’s prefrontal cortex during working memory task was evaluated. Young (approximately 3 month) male Sprague-Dawley rats were divided into two group: propofol rats and control rats. Propofol rats received propofol at 0.9 mg/Kg·min intravenously for 2 h. After 12 h, LFPs of all rats were measured simultaneously from multiple electrodes placed in prefrontal cortex while rats were performing a working memory task in Y-maze. LFPs instantaneous phase were obtained by applying Hilbert transform, and cross-correlation coherence of LFPs was calculated. The results indicate that propofol decreased the correct rate and crosscorrelation coherence of LFPs on the first two days (p 0.05). Our results suggest that propofol can impair cross-correlation coherence of LFPs in the first two days, but not long time.

Development of a new field-deployable RT-qPCR workflow for COVID-19 detection

Background:Outbreaks of coronavirus disease 2019(COVID-19)have been recorded in different countries across the globe.The virus is highly contagious,hence early detection,isolation,and quarantine of infected patients will play an important role in containing the viral spread.Diagnosis in a mobile lab can aid to find infected patients in time.Methods:Here,we develop a field-deployable diagnostic workflow that can reliably detect COVID-19.Instruments used in this workflow can easily fit in a mobile cabin hospital and also be installed in the community.Different steps from sample inactivation to detection were optimized to find the fastest steps and portable instruments in the detection of COVID-19.Each step was compared to that of the normal laboratory diagnosis setup.Results:From the results,our proposed workflow(80 min)was two times faster compared to that of the normal laboratory workflow(183 min)and a maximum of 32 samples could be detected at each run.Additionally,we showed that using 1%Rewocid WK-30 could inactivate the novel coronavirus directly without affecting the overall detection results.Comparison of our workflow using an in-house assay to that of a commercially acquired assay produced highly reliable results.From the 250 hospital samples tested,there was a high concordance 247/250(98.8%)between the two assays.The in-house assay sensitivity and specificity were 116/116(100%)and 131/134(97.8%)compared to that of the commercial assay.Conclusion:Based on these results,we believe that our workflow is fast,reliable,adaptable and most importantly,field-deployable.

From Text to Field:Study on the Intercultural Communication of Music in Collection of Chinese Works and Translations by Matteo Ricci from the Perspective of Maritime Silk Road

In this paper,with Collection of Chinese Works by Matteo Ricci written by Zhu Weizheng and A summary Interpretation of Chinese literature of Matteo Ricci in Ming and Qing Dynasties written by Tang Kaijian as major research texts and historical basis,as well as intercultural communication as the major research method,the aesthetic adaptation of native music of traditional Chinese music,etiquette,sacrifice and religious customs under the description of Matteo Ricci is discussed and interpreted from the perspective of the spread of musical culture of the Maritime Silk Road,four stages of field investigation are planned,and related musical activities and local musical phenomena appearing in his literature have an on-site visit.In this way,the vital position and historical significance of Matteo Ricci’s cultural missionary activities in the music communication on the Maritime Silk Road are obtained.

MY WORK IN THE FIELD OF NUCLEAR PHYSICS

After graduating from the physics department of Qinghua University in 1952, I started working in the development of nuclear detectors (including cloud chambers and scintillometers) under the instruction of Profs. Yang Chengzhong and Dai Chuanzeng at the CAS Institute of Modern Physics.From 1956 to 1958,I studied at Lebedev’s Institute of Physics under the Soviet Academy

MY R&.D WORK IN THE FIELD OF HF RADAR SYSTEMS

Since 1958. I bave been doing research and teaching work at Harbin Polytechnic on the theories of radar,navigational guidance,and signal processing & information treatment by developing new radar systems. In 1979, I went to England in the status of an honorary research fellow and stayed there for two years.probing into HF radar systems under the guidance of the world-famous British marine telemetrist Professor Shearman at Birmingham University.Here.I briefly

MY WORK IN THE FIELD OF FLUID MECHANICS

I graduated from the National Peiyang University (now called Tianjin University) in 1950, majoring in hydraulic engineering. Starting from 1952, my teaching work was basically in mechanics.My first academic probe was in cybernetics, resulting in the publication of the first Chinese paper concerning optimal control. After 1963, I worked on the theory of hydrodynamic stability. My explorative thrust is at the eigenvalues of the Orr Sommerfeld Equation,a non-self adjoint problem in

空调控制系统CAN与Lon Works总线应用探究

文章对目前空调控制系统中的CAN和Lon Works现场总线技术的协议标准、数据结构、通信模式及应用特性等进行了比较分析,并根据其各自特点,提出在空调系统中混合构建控制系统的方法。

应用Lon Works现场总线技术的索网反射面控制系统设计

提出基于Lon Works现场总线的大射电望远镜索网反射面节点控制方法,节点控制器采用嵌入式技术设计。该系统使用32位ARM微处理器AT91RM9200与神经元芯片Neuron3120xx,以主从CPU的形式构成节点控制器,实现对现场数据的处理和电动机的控制。系统具有网络节点分布灵活、节点容量大、控制实时性好,能很好地满足大射电望远镜索网反射面的节点控制要求。

OPC技术与Lon Works技术在智能建筑系统集成中的应用

通过对智能建筑系统集成的需求分析,设计出了一种基于OPC技术与Lon Works总线技术融合的智能建筑系统集成应用模型,同时,将OPC技术与Lon Works总线技术应用于智能建筑系统集成中,实现了系统的集成和资源的共享。满足了智能建筑对各子系统之间的数据共享、设备管理和互操作性等要求。

基于Lon Works总线的远程数字视频监控系统

介绍了一种基于Lon Works总线的远程数字视频监控系统。在利用原有工业现场信号通道的基础上,通过FPGA实现对工业现场的模拟视频的数字化以及数字图像的预处理,经神经元芯片,将图像数据传送至上位主机,实现图像识别及远程监控,为远程监控系统的模拟信号数字化提供了一个新的途径。

Research on numerical simulation of flow field in shallow-bath dense-medium separator

介绍了浅槽重介分选机的结构、工作原理和技术特点，并采用Fluent软件，对浅槽重介分选机内部的流场进行了分析和研究，得出了各主要位置的速度和速度变化规律。揭示了浅槽重介分选机在分选过程中的悬浮液体流场形态及运动规律，以为其结构设计和改进提供理论依据。

基于Lon Works现场总线的热量采集系统的开发

介绍了一种由LonWorks现场总线与Neuron3150芯片相结合开发的智能热量采集器,阐述了系统的硬件组成及部分主要软件程序,实现通过上位机向控制中心传送各点热量信息,完成实时数据显示,进而达到智能控制效果。此外,综合运用了Lon总线的网络功能对温室中各个节点热量表进行采集和记录,采集实验数据,为深入研究提供较好的实验依据。

Dynamic changes of gravity fields before and after the 2008 Wenchuan earthquake(Ms8.0)

The pattern evolution and dynamic mechanism of the dynamic changes of regional gravity fields occurring before and after the Wenchuan Ms8.0 earthquake are analyzed, based on five epochs of 1998 -2007 mobile gravity data from the middle-south section of the north-south seismic belt, and two epochs of field research data collected after the 2008 Wenchuan earthquake in combination with GPS data, leveling observations, and geotectonic environment data. The regional dynamic gravity changes demonstrate the effects of the eastward flow of solid matter in the Qinghai-Tibetan plateau and the preparation of the 2008 Wenchuan earthquake （2- 10 yr）. The two most meaningful gravity indicators of the Wcnchuan earthquake preparation are the positive （increasing） gravity changes occurring over many years in the southwest epicenter and the largescale gradient zone of gravity variation, with the cumulative difference between the two sides of the gradient zone of gravity exceeding 200 μGal. The positive gravity changes may facilitate a constant energy accumulation and the gradient belt may support seismic shear breakage. Overall, the gravity changes associated with the earthquake preparation indicate a pattern of accelerating increase-decelerating increase-earthquake occurrence. The Songpan-Ganzi block generally displays a negative gravity change, providing evidence for a local upwarp- ing of the deep crust-mantle and an interior expansion of the deep crust attributable to high temperatures. The viewpoint is consistent with the dilatant mechanism for earthquake preparation.

Variable Thermal Comfort Index for Indoor Work Space in Office Buildings: A Study in Germany

International standards state the thermal comfort requirements that office spaces must comply with. These are based on a model developed by Prof. Paul Ole Fanger of the Centre for Indoor Environment and Energy, Denmark. Today, forty-year research shows an evolution in these experiences. The work presented here is to develop a tool to evaluate the thermal comfort of working environments of office buildings. A methodology is devised on the basis of on-site measurements and questionnaire responses. For measurements, a mobile unit equipped with sensors is used, whereas the questionnaire obtains user responses on thermal quality of the work space. The thermal conditions of thirty office buildings presenting different acclimatization systems have been surveyed. The correlation between objective and subjective data allows developing a formula that shows the thermal comfort level for a given environment as a function of local aspects. For the surveyed buildings, the resulting comfortable temperature was 23.3℃, and the minimum percentage of user individuals experiencing discomfort with such temperature was 7%.

Field report:Research along the Yarlung Suture Zone in Southern Tibet,a persistent geological frontier

The Yarlung Suture Zone in Southern Tibet marks the boundary between India and Asia-formerly separated by an ocean basin-and is a critical record of the tectonic processes that created the Tibetan Plateau. The Yarlung Suture Zone is also a frontier research area, as difficulty of access has limited research activity, providing ample opportunities for new discoveries. This paper documents field research conducted by the authors along the Yarlung suture zone in eastern Xigaze(Shigatse, Rikaze)County, ~250 km west of the city of Lhasa, in July 2017. The goal of this research was to map the Suture Zone structure in detail, and more specifically to understand the branching relationships between two major fault systems-the Great Counter Thrust and Gangdese Thrust. A summary of early geological exploration is included to provide context for this research.

PROBE-HOLE FIELD EMISSION MICROSCOPE SYSTEM CONTROLLED BY COMPUTER

A probe-hole field emission microscope system,controlled by the Apple Ⅱ computer,has been developed and operated successfully for measuring the work function of a single crystalplane.The detection screen,the phototube and the amplifier are combined for measuring theprobe-hole current.The combination is calibrated and the calibrated data are used in the com-puter program.The high voltage on the viewing screen is adjusted by using a D/A converter.The total current and the probe-hole current are acquired by using an A/D converter.A programin BASIC is used for processing all data and the Fowler-Nordheim plot parameters are given.Work functions of single crystal planes can then be calculated;as examples,the work functionson the clean W(100)and W(111)planes are measured to be 4.67 eV and 4.45 eV,respectively.

Child Abdominal Trauma Due to Attack of Cattles While Working on Farms in Burkina Faso

Introduction: Cattle are strong animals very often used in agriculture in rural Africa. Unpredictable in their behavior, they regularly inflict injuries to farmers, some of whom are children in rural Africa. Objective: The purpose of this study was to describe the clinical, therapeutic and evolutionary aspects of abdominal trauma caused by bovidae to children on farms in Burkina Faso. Patients and Method: This is a descriptive study covering the period from January 2014 through December 2016 and was conducted in the General Surgery Unit of the Tenkodogo Regional Hospital in Burkina Faso. It included all patients under the age of 17, victims of abdominal trauma by cattle on farms. Result: A total of 68 patients were identified, which is 3% of all patients under 17 admitted to the service during the same period. The average age of patients was 10.5 years, with a standard variation of 3.6 years. The majority (73.5%) of the patients were boys. The main lesional mechanisms found were horn strokes (88.2%). We noted 35 eviscerations without visceral perforation, 15 intestinal perforations, 6 hepatic wounds and 5 splenic wounds. In 7 cases, there were non-penetrating wounds. All patients underwent surgical intervention under anesthesia. The average length of hospital was 6 days. Two deaths were recorded, making a mortality rate of 3%. Conclusion: Abdominal traumas of the child by attack of cattle are frequent during farm works in rural Burkina Faso. The injuries are sometimes serious. Wearing protective equipment for children should be considered during farm work.

Modelling Pathways for Outbreaks in Field Occupational Epidemiology

Background: The investigation of an occupational outbreak, once the index case has been identified, triggers a stress situation to epidemiologists. Modelling occupational outbreaks will be useful to guide the field investigation. Objective: To identify standard pathways for occupational epidemic outbreaks. Methods: In-depth critical appraisal of 57 occupational outbreaks. Standard pathways of occupational outbreaks were identified by analysing the similarity between out-breaks. The model’s accuracy and homogeneity were established through Fisher’s exact test and the Kappa Index. Results: The analysis allowed synthesizing the occupational outbreaks variability in 4 pathways. 92.98% of the analysed outbreaks could be allocated to one of those 4 types. The theoretical patterns showed a good adjustment with the analysed out-breaks: Type I (Kappa = 0.94 - 0.60), Type II (Kappa = 1.00), Type III (Kappa = 1.00 - 0.68) and Type IV (Kappa = 0.94 - 0.87). The probability of a given outbreak fitting with its three components in any of the theoretical pathways was 0.83. Conclusions: The incorporation of those pathways to the field occupational epidemiology will allow: 1) to provide early guidance to epidemiological, clinical and environmental studies focused on specific hypothesis of causality;2) to anticipate preventive measures;3) to contribute to an earlier and more efficient outbreak resolution.