current

摘要： Seamounts aff ect the surrounding physical oceanography and form unique dynamic processes.The infl uences of these processes on biological and sedimentary distributions are quite diff erent in seamount areas at diff erent depths.The Y3 seamount is located in the Yap Arc of the tropical Western Pacifi c Ocean.The water depth of its summit is~280 m.Based on fi eld data obtained in December 2014 and other open-access data,the physical oceanography around the Y3 seamount was preliminarily analyzed.The results show that the upper layer(0-150 m)was under the infl uence of the westward-fl owing North Equatorial Current(NEC),while the eastward-fl owing North Equatorial Undercurrent(NEUC)controlled the water between 200-800 m.The NEC was strong and steady,but the NEUC was disturbed by the Y3 seamount.The cold dome above the Y3 seamount was not caused by a Taylor cap or tidal rectifi cation but probably by upwelling during the survey time.Tidal currents were squeezed against topography and greatly amplifi ed in the Y3 seamount.The thicknesses of the surface turbulent layers were greatly infl uenced by the spring-neap tidal cycle.The turbulent diff usivities in the sea surface layer above the Y3 seamount were much larger than those in the open ocean.Calculations showed that the surface wind stress greatly aff ected the turbulent mixing in the surface layer of the Y3 seamount.The reciprocal action between the amplifi ed tidal currents and topography was the most likely cause of the turbulent mixing near the bottom of the Y3 seamount.This study can provide a scientifi c basis for further study of biological and depositional characteristics at the Y3 seamount.

摘要： In this work,we printed a Nafion precursor membrane by fused deposition modeling(FDM)rapid prototyping technology and further fabricated IPMCs by electroless plating.The ion-exchange capacity of the Nafion membrane was tested,and the morphology of IPMCs was observed.The electro-mechanical properties of IPMCs under AC voltage inputs were studied,and grasping experiments were performed.The results show that the Nafion membrane after hydrolysis has a good ion-exchange ability and water-holding capacity.SEM observed that the thickness of the IPMC’s electrode layer was about 400 nm,and the platinum layer was tightly combined with the substrate membrane.When using a square wave input of 3.5 V and 0.1 Hz,the maximum current of IPMCs reached 0.30 A,and the displacement and blocking force were 7.57 mm and 10.5 mN,respectively.The new fabrication process ensures the good driving performance of the printed IPMC.And two pieces of IPMCs can capture the irregular objects successfully,indicating the feasibility of printing IPMCs by FDM technology.This paper provides a new and simple method for the fabrication of three-dimensional IPMCs,which can be further applied in flexible grippers and soft robotics.

摘要： Atrial fibrillation(AF)is the most common cardiac arrhythmia worldwide.The prevalence of the disease increases with age,strongly implying an age-related process underlying the pathology.At a time when people are living longer than ever before,an exponential increase in disease prevalence is predicted worldwide.Hence unraveling the underlying mechanics of the disease is paramount for the development of innovative treatment and prevention strategies.The role of voltage-gated sodium channels is fundamental in cardiac electrophysiology and may provide novel insights into the arrhythmogenesis of AF.Na_v1.5 is the predominant cardiac isoform,responsible for the action potential upstroke.Recent studies have demonstrated that Na_v1.8(an isoform predominantly expressed within the peripheral nervous system)is responsible for cellular arrhythmogenesis through the enhancement of pro-arrhythmogenic currents.Animal studies have shown a decline in Na_v1.5 leading to a diminished action potential upstroke during phase 0.Furthermore,the study of human tissue demonstrates an inverse expression of sodium channel isoforms;reduction of Na_v1.5 and increase of Na_v1.8 in both heart failure and ventricular hypertrophy.This strongly suggests that the expression of voltage-gated sodium channels play a crucial role in the development of arrhythmias in the diseased heart.Targeting aberrant sodium currents has led to novel therapeutic approaches in tackling AF and continues to be an area of emerging research.This review will explore how voltage-gated sodium channels may predispose the elderly heart to AF through the examination of laboratory and clinical based evidence.

摘要： New and sophisticated endovascular devices, such as drug-eluting stents(DES)and drug-coated balloons(DCB), provide targeted drug delivery to affected vessels. The invention of these devices has made it possible to address the reparative cascade of arterial wall injury following balloon angioplasty that results in restenosis. DESs were first used for the treatment of infrapopliteal lesions almost 20 years ago. More recently, however, DCB technology is being investigated to improve outcomes of endovascular below-the-knee arterial procedures, avoiding the need for a metallic scaffold. Today, level IA evidence supports the use of infrapopliteal DES for short to medium length lesions,although robust evidence that justifies the use of DCBs in this anatomical area is missing. This review summarizes and discusses all available data on infrapopliteal drug-elution devices and highlights the most promising future perspectives.

摘要： English is not only a language,but also a tool.There are many factors that affect students’English learning quality and ef?ficiency,among which the biggest one is learning motivation.At present,some non-English majors in our country lack the motiva?tion of English learning,and the phenomenon of students’grade differentiation becomes more and more obvious,which seriously affects the process and quality of English teaching in the whole class.Analyzing and exploring the present situation and cultivation of English learning motivation of non-English majors can improve the quality and level of English learning of Chinese college stu?dents as a whole.

摘要： We have obtained exact static plane-symmetric solutions to the spinor field equations with nonlinear terms which are arbitrary functions of invariant , taking into account their own gravitational field. It is shown that the initial set of the Einstein and spinor field equations with a power-law nonlinearity have regular solutions with a localized energy density of the spinor field only if m=0 (m is the mass parameter in the spinor field equations). Equations with power and polynomial nonlinearities are studied in detail. In this case, a soliton-like configuration has negative energy. We have also obtained exact static plane-symmetric solutions to the above spinor field equations in flat space-time. It is proved that in this case soliton-like solutions are absent.

摘要： In this paper we work with a special theory of gravity|the Novello-Di Lorenci-Luciane (hereby called NDL theory) which extends the Feynman-Deser standard theoretical-fi eld approach to General Relativity. In the so-called NDL theory, matter interacts universally with gravity in accordance with the Weak Equivalence Principle, while gravitons have a nonlinear self-interaction. Our main aim in this work is to show that, though the NDL theory does not admit a Schwarzschild solution, the Jebsen-Birkhoff theorem is still valid in this framework.

摘要： In this paper, the impact of extra electron source(EES) and dual metal gate engineering on conventional charge plasma TFET(CP-TFET) have been done for improving DC and analog/RF parameters. CP-TFET structure is upgraded to double source CP-TFET(DS-CP-TFET) by placing an EES below the source/channel junction for enhancing the device performance in terms of driving current and RF figures of merit(FOMs). But, in spite of these pros, the approach is having cons of higher leakage current similar to MOSFET and negative conductance(inherent nature of TFET). Both the issues have been resolved in the double source dual gate CP-TFET(DS-DG-CP-TFET) by gate workfunction engineering and drain underlapping respectively. Additionally,for getting the optimum performance of DS-DG-CP-TFET, the device sensitivity has been investigated in terms of position of EES,length of drain electrode and workfunction of gate electrode 1(GE1).

摘要： AbstractThis paer uses a new method to deal with skin effect problem of tubular bus. Thenumericalformulars for calculating altemating current resistamce are deduced By means of one-dimensionSearch methodit detemnines critical thickness referred tominimum alternating current resistance ofthe bus. The satisfactory calculated results also given in the paper.

摘要： 本发明公开了一种基于Pulse‑Current模式的宽动态范围中子通量测量系统和方法，所述系统包括：裂变室、参考室、Pulse模块、Current模块、后处理模块和模式选择模块。本发明还公开了一种基于Pulse‑Current模式的宽动态范围中子通量测量方法。本发明从根本上解决了传统的宽动态范围中子通量测量过程中对本底射线抑制能力和信噪比要求之间的矛盾。

摘要： 本发明公开了一种PFG Emission Current检测电路，属于半导体制造领域。PFG Emission Current检测电路包括：电路供电单元(1)、信号转换单元(2)、信号处理单元(3)。由于所选放大器均需求±15V供电，需由电路供电单元(1)将原先所有的24V直流电转化为所需的供电；由PFG检测到的信号为电流信号，需要由信号转换单元(2)将其转化为电压信号，再由放大器对信号进行处理；信号需要由信号处理单元(3)放大，仪表放大器接收到电压信号之后先将电压信号正向放大10倍，再由运算放大器正向放大5倍(或不放大)再由电压跟随器输出。得到的运算放大器输出的信号进入控制器并经过计算显示出来。

摘要： 本发明公开了一种基于Pulse-Current模式的宽动态范围中子通量测量系统和方法，所述系统包括：裂变室、参考室、Pulse模块、Current模块、后处理模块和模式选择模块。本发明还公开了一种基于Pulse-Current模式的宽动态范围中子通量测量方法。本发明从根本上解决了传统的宽动态范围中子通量测量过程中对本底射线抑制能力和信噪比要求之间的矛盾。

摘要： 本发明公开了一种基于current‑ellipse模型的车辆动态跟踪方法，包括以下步骤：S1、在GNSS信号受限区域部署RSUs车辆无线定位系统，获取目标跟踪车辆的运动观测数据；S2、以current模型为基础，改进得到目标跟踪车辆的current‑ellipse运动数学模型；S3、在步骤S2改进得到的current‑ellipse运动数学模型的基础上，对来自RSUs的目标跟踪车辆观测数据执行自适应卡尔曼滤波算法，从而得到精确的目标跟踪车辆的运动数据。本发明引入RSUs辅助定位，并基于一种新的车辆运动数学模型current‑ellipse和采用自适应卡尔曼滤波的融合算法，实现动态车辆精确跟踪。

摘要： 本发明公开了一种基于current‑ellipse模型的车辆动态跟踪方法，包括以下步骤：S1、在GNSS信号受限区域部署RSUs车辆无线定位系统，获取目标跟踪车辆的运动观测数据；S2、以current模型为基础，改进得到目标跟踪车辆的current‑ellipse运动数学模型；S3、在步骤S2改进得到的current‑ellipse运动数学模型的基础上，对来自RSUs的目标跟踪车辆观测数据执行自适应卡尔曼滤波算法，从而得到精确的目标跟踪车辆的运动数据。本发明引入RSUs辅助定位，并基于一种新的车辆运动数学模型current‑ellipse和采用自适应卡尔曼滤波的融合算法，实现动态车辆精确跟踪。

摘要： 本发明公开了一种current steering DAC开关阵列驱动电路，包括驱动器1、驱动器2、驱动器3、驱动器4、驱动电压Vg1、驱动电压Vg2、驱动电压Vg3、驱动电压Vg4、功率开关管MP1、功率开关管MP2、功率开关管MP3、功率开关管MP4、PMOS管Md1、NMOS管Md2、PMOS管Md3、PMOS管Md4、电压源VDD1、电压源VDD2、电压Vcom、输入信号Din和输入信号Vin。本发明的有益效果：新的驱动器结构可以输出不为零的低电压。使开关管MP1～MP4导通时工作在饱和区；LDO电源的使用隔离了噪声，同时提高了驱动器输出信号的高电压，有效的关断开关管MP1～MP4；提高了电流泵DAC的输出阻抗，提高了高频动态性能。

摘要： 本发明公开了一种抗干扰高性能current steering DAC电路，包括反相器D1、反相器D2、反相器D3、反相器D4、驱动电压Vg1、驱动电压Vg2、驱动电压Vg3、驱动电压Vg4、功率开关管MP1、功率开关管MP2、功率开关管MP3、功率开关管MP4、电压源High_LDO、电压源Low_LDO，电压源VDD_H，电压源VDD_H通过一个电流源同时与功率开关管MP1、功率开关管MP2、功率开关管MP3和功率开关管MP4相连接，反向器D1经过驱动电压Vg1与功率开关管MP1相连接，反向器D2经过驱动电压Vg2与功率开关管MP2相连接，反向器D3经过驱动电压Vg3与功率开关管MP3相连接，反向器D4经过驱动电压Vg4与功率开关管MP4相连接。有益效果：使得驱动开关阵列的驱动电压信号工作在High_LDO——Low_LDO电压范围，保证开关阵列开启的同时工作在饱和区。

摘要： 本实用新型公开了一种current steering DAC开关阵列驱动电路，包括驱动器1、驱动器2、驱动器3、驱动器4、驱动电压Vg1、驱动电压Vg2、驱动电压Vg3、驱动电压Vg4、功率开关管MP1、功率开关管MP2、功率开关管MP3、功率开关管MP4、PMOS管Md1、NMOS管Md2、PMOS管Md3、PMOS管Md4、电压源VDD1、电压源VDD2、电压Vcom、输入信号Din和输入信号Vin。本实用新型的有益效果：新的驱动器结构可以输出不为零的低电压。使开关管MP1～MP4导通时工作在饱和区；LDO电源的使用隔离了噪声，同时提高了驱动器输出信号的高电压，有效的关断开关管MP1～MP4；提高了电流泵DAC的输出阻抗，提高了高频动态性能。

摘要： 本实用新型公开了一种抗干扰高性能current steering DAC电路，包括反相器D1、反相器D2、反相器D3、反相器D4、驱动电压Vg1、驱动电压Vg2、驱动电压Vg3、驱动电压Vg4、功率开关管MP1、功率开关管MP2、功率开关管MP3、功率开关管MP4、电压源High_LDO、电压源Low_LDO，电压源VDD_H，电压源VDD_H通过一个电流源同时与功率开关管MP1、功率开关管MP2、功率开关管MP3和功率开关管MP4相连接，反向器D1经过驱动电压Vg1与功率开关管MP1相连接，反向器D2经过驱动电压Vg2与功率开关管MP2相连接，反向器D3经过驱动电压Vg3与功率开关管MP3相连接，反向器D4经过驱动电压Vg4与功率开关管MP4相连接。