An aqueous BiI_(3)-Zn battery with dual mechanisms of Zn^(2+)(de)intercalation and I^(-)/I_(2)redox

The development of aqueous battery with dual mechanisms is now arousing more and more interest.The dual mechanisms of Zn^(2+)(de)intercalation and I^(-)/I_(2)redox bring unexpected effects.Herein,differing from previous studies using Zn I_(2)additive,this work designs an aqueous Bi I_(3)-Zn battery with selfsupplied I^(-).Ex situ tests reveal the conversion of Bi I_(3)into Bi(discharge)and Bi OI(charge)at the 1st cycle and the dissolved I^(-)in electrolyte.The active I^(-)species enhances the specific capacity and discharge medium voltage of electrode as well as improves the generation of Zn dendrite and by-product.Furthermore,the porous hard carbon is introduced to enhance the electronic/ionic conductivity and adsorb iodine species,proven by experimental and theoretical studies.Accordingly,the well-designed Bi I_(3)-Zn battery delivers a high reversible capacity of 182 m A h g^(-1)at 0.2 A g^(-1),an excellent rate capability with 88 m A h g^(-1)at 10 A g^(-1),and an impressive cyclability with 63%capacity retention over 20 K cycles at 10 A g^(-1).An excellent electrochemical performance is obtained even at a high mass loading of 6 mg cm^(-2).Moreover,a flexible quasi-solid-state Bi I_(3)-Zn battery exhibits satisfactory battery performances.This work provides a new idea for designing high-performance aqueous battery with dual mechanisms.

Dual-doping for enhancing chemical stability of functional anionic units in sulfide for high-performance all-solid-state lithium batteries

The sulfide-based solid-state electrolytes(SEs)reactivity toward moisture and Li-metal are huge barriers that impede their large-scale manufactu ring and applications in all-solid-state lithium batteries(ASSLBs).Herein,we proposed an Al and O dual-doped strategy for Li_(3)PS_(4)SE to regulate the chemical/electrochemical stability of anionic PS_(4)^(3-)tetrahedra to mitigate structural hydrolysis and parasitic reactions at the SE/Li interface.The optimized Li_(3.08)A_(10.04)P_(0.96)S_(3.92)O_(0.08)SE presents the highestσLi+of 3.27 mS cm^(-1),which is~6.8 times higher than the pristine Li_(3)PS_(4)and excellently inhibits the structural hydrolysis for~25 min@25%humidity at RT.DFT calculations confirmed that the enhanced chemical stability was revealed to the intrinsically stable entities,e.g.,POS33-units.Moreover,Li_(3.08)Al_(0.04)P_(0.96)S_(3.92)O_(0.08)SE cycled stably in Li//Li symmetric cell over 1000 h@0.1 mA cm^(-2)/0.1 mA h cm^(-2),could be revealed to Li-Al alloy and Li_(2)Oat SE/Li interface impeding the growth of Li-dendrites during cycling.Resultantly,LNO@LCO/Li_(3.08)Al_(0.04)P_(0.96)S_(3.92)O_(0.08)/Li-In cell delivered initial discharge capacities of 129.8 mA h g^(-1)and 83.74%capacity retention over 300 cycles@0.2 C at RT.Moreover,the Li_(3.08)Al_(0.04)P_(0.96)S_(3.92)O_(0.08)SE presented>90%capacity retention over 200 and 300 cycles when the cell was tested with LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2)(NCA)cathode material vs.5 and 10 mg cm^(-2)@RT.

Intravenous Contrast Material Administration at High-pitch Dual-source CT Coronary Angiography: Bolus-tracking Technique with Shortened Time of Respiratory Instruction Versus Test Bolus Technique

Objective To investigate the feasibility of acquiring the similar homogeneous enhancement using bolus-tracking techniques with shortened respiratory time in prospectively electrocardiogram-gated high-pitch spiral acquisition mode (Flash mode) coronary computed tomography angiography (CCTA) compared with test bolus technique. Methods One hundred and eighty-four consecutive patients with mean heart rate ≤65 beats per minute undergoing CCTA were prospectively included in this study. The patients were randomly divided into two groups. Patients in the group A (n=92) instructed to shorten respiratory time received CCTA using bolus-tracking technique with high-pitch spiral acquisition mode (Flash mode), while those in the group B (n=92) underwent CCTA with test bolus technique. The attenuation in the ascending aorta, image noise, contrast-to-noise ratio and radiation doses of the two groups were assessed. Results There were no significant differences in the mean attenuation values in the ascending aorta (483.18±59.07 HU vs. 498.7±83.51 HU, P=0.183), image noise (21.4±4.5 HU vs. 20.9±4.3 HU, P=0.414), contrast-to-noise ratio (12.1±4.2 vs. 13.8±5.1, P=0.31) between the groups A and B. There were no significant differences in the radiation dose of dynamic monitoring scans (0.056±0.026 mSv vs. 0.062±0.018 mSv, P=0.068) and radiation dose of angiography (0.94±0.07 mSv vs. 0.96±0.15 mSv,P=0.926) between the two groups, while 15 mL less contrast material volume was administered in the group A than the group B. Conclusion Bolus-tracking technique with shortened time of respiratory in Flash mode of dual-source CT yields the similar homogeneous enhancement with less contrast material in comparison to the test bolus technique.

A DUAL-CAMERA VIDEO-TRACKING SYSTEM USING PROJECTION ALGORITHM

This paper presents a video-tracking system composed of two cameras. One camera acts for producing an in-focus image of the object and the other one ensures an extended vision field under monitoring. Such a system scheme can achieve an excellent tracking performance,especially under various unfavorable conditions. A projection algorithm is used for the calculation of the displacement of the moving object. As a result, the computational cost is reduced greatly.In order that the tracking action of the system persists even if the object is sheltered or ns acceleration is larger than a specified threshold, a dedicated tracking algorithm on the basis of the α-β filtering is designed. Experiments show that the algorithm is efficient and the system works very well.

职业本科“四维双轨”课程体系构建--以广西农业职业技术大学人工智能工程技术专业为例

职业教育专业建设的核心是课程体系,文章梳理了职业本科课程体系构建及发展面临的困境,阐述了职业本科课程体系构建的意义,并以广西农业职业技术大学人工智能工程技术专业为例,通过对行业、企业进行深度调研,结合社会对人才的需求,对岗位所需职业能力进行分解,确定不同的岗位所对应的能力和知识点,构建起“四维双轨”的职业本科课程体系,旨在培养行业所需、社会所需、国家所需的高素质技术技能型人才。

基于模糊滑模控制的双6-DOF机械臂协同控制方法

目前,双机械臂搬运系统的传统搬运策略存在搬运效果差、双机械臂同步性较差等问题,同时双机械臂的轨迹规划只针对末端轨迹,并未考虑运动状态下机械臂关节处产生的力矩。通过建立UR5机械臂的模型,分析双机械臂搬运状态的运动特点,建立了一种新的基于模糊滑模控制的双机械臂协同控制方法。首先通过对双机械臂建立运动学闭链约束关系,使得双机械臂能够实现期望轨迹运动,其次建立双机械臂的相邻误差交叉耦合同步策略,意在解决双机械臂之间的同步性问题,最后提出的模糊滑模控制策略,通过建立滑模面和滑模趋近律,实现机械臂的轨迹跟踪效果与关节处的控制输入稳定。最后通过对UR5机械臂进行滑模控制仿真,验证了该策略的可行性。

影子教育也会影响教育分流吗--基于CFPS2010-2018年追踪数据实证分析

已有文献关注了学校教育质量在教育分流中的作用机制,但鲜有研究关注影子教育参与对教育分流过程和结果的影响。基于CFPS2010—2018年追踪数据的研究发现,影子教育具有教育分流作用,且该作用存在累积性,影子教育与学校教育在当前教育分流中存在协作机制。具体而言,在中高考升学过程中,家庭资本可以通过学校教育和影子教育共同影响学生中高考升学结果,影子教育与学校教育构成了当前教育分流的“双轨道”。以上结论表明,影子教育的教育分流作用扩大了不同阶层子女教育机会获得的不平等,加重了家长焦虑,加剧了教育内卷。“双减”政策的施行,将有助于削弱影子教育的教育分流作用,缩小不同阶层子女教育机会获得的不平等。

Simulation study on starting of dual clutch transmission for tracked vehicles

In order to study the application of dual clutch transmission （DCT） on tracked vehicles, a simulation moclel and two control methods were performed for starting analysis. Based on a certain transmission of an existing tracked vehicle, a DCT structure was proposed. Matlab/Simulink was a dopted as a platform to develop the simulation model. The engine speed was controlled to follow the target speed as a launch strategy. Two control methods, a proportional integral derivative （ PID ） control method and a fuzzy control method, were proposed to control the engine throttle and oil pressure in order to track the target engine speed. Simulation results show that either the PID control or fuzzy control method can improve the starting performance compared with no loop control meth od. Fuzzy control method can lead a better starting quality compared with PID control method.

Theoretical Comparative Energy Efficiency Analysis of Dual Axis Solar Tracking Systems

This paper developed a theoretical model substantially based on the principle that only the normal component of solar radiation is actually converted into electrical energy. This theoretical model helped to predict minimum and maximum daily energy gain (compared to static PV system tilted with certain angle) when using dual axis PV solar tracking systems, at any given location on earth without prior experimental data. Based on equations derived from model, minimum and maximum energy gain is computed and summarized in tables of minimum and maximum. Furthermore, the model equations could be used to set up future experimental studies related to the matter.

3D Track-keeping Method for Autonomous Underwater Vehicle

In this paper, 3D track-keeping control method for autonomous underwater vehicle (AUV) with and without the influence of ocean current is investigated. Because the system to be controlled is highly nonlinear and strong coupled, an approach is used to divide it into two subsystems. One is to control the heading and the track error on the horizontal plane. The other is to control the pitch and the track error on the vertical plane. The results of computer simulation show that the autopilot works properly, it can capture the current waypoint and turns to track the next path automatically.

Tracking of Non-Rigid Object in Complex Wavelet Domain

In this paper we have proposed an object tracking method using Dual Tree Complex Wavelet Transform (DTCxWT). The proposed method is capable of tracking the moving object in video sequences. The object is assumed to be deform-able under limit i.e. it may change its shape from one frame to another. The basic idea in the proposed method is to decompose the image into two components: a two dimensional motion and a two dimensional shape change. The motion component is factored out while the shape is explicitly represented by storing a sequence of two dimensional models. Each model corresponds to each image frame. The proposed method performs well when the change in the shape in the consecutive frames is small however the 2-D motion in consecutive frames may be large. The proposed algorithm is capable of handling the partial as well as full occlusion of the object.

Bis(1-(4-(dimethylamino)benzylidene)-4-phenylthiose micarbaznato)palladium(Ⅱ):Synthesis,Crystal Structure and Its Dual Fluorescence Property

The title compound bis（1-（4-（dimethylamino）benzylidene）-4-phenylthiosemicar-bazato）-palladium（Ⅱ）（PdL2） was obtained by reacting 1-（4-（dimethylamino）benzylidene）-4-phenyl-thiosemicarbazide with dichlorobis（benzonitrile）palladium（Ⅱ） in methanol,and its structure was characterized by single-crystal X-ray diffraction.The crystal of PdL2 was obtained in dimethyl-formamide（DMF） solvent with solvent molecules involved in the cell and crystallizes in the monoclinic system,space group C2 with a = 18.485（15）,b = 7.090（5）,c = 17.595（11） ,β = 121.21（3）o,V = 1972（2） 3,Z = 2,Mr = 847.40,Dc = 1.427 g/cm3,μ = 0.624 mm-1,F（000） = 880,R = 0.0607 and wR = 0.1358.The Pd atom adopts a distorted square planar coordination geometry with two Pd-N and two Pd-S bonds.The ligand loses a proton from its tautomeric thiol form and coordinates to the Pd atom via mercapto sulfur and the imine nitrogen atom,which binds to palladium as bidentate N,S-donors forming five-membered chelate rings.The complex formed hydrogen bonding interaction with solvent DMF molecules from the hydrogen of phenylamine to the oxygen of DMF and several intramolecular hydrogen bonds.Pd（Ⅱ） perturbed ligand π-π＊ transition and metal-to-ligand charge transfer（MLCT） transition are observed in its electronic absorption spectra.The complex exhibits intraligand 1π-π＊（IL） state and MLCT state dual fluorescent emissions in organic solvent at room temperature.

眼-脑卒中“双轨并行”治疗在视网膜中央动脉阻塞患者溶栓中的应用

目的:探讨眼-脑卒中绿色通道“双轨并行”治疗流程在视网膜中央动脉阻塞(CRAO)患者中超选择溶栓治疗的应用效果。方法:实行眼-脑卒中绿色通道“双轨并行”治疗流程;选取流程优化前42名CRAO患者为对照组,流程优化后38名CRAO患者为观察组,比较两组患者治疗有效率及黄斑中心凹厚度,患者到院至用药时间(DNT)及各关键环节时间。结果:观察组治疗有效率比对照组高23.7%,两组有效率差异有统计学意义(P<0.05);与对照组相比,观察组术后1周黄斑中心凹厚度更薄,差异具有统计学意义(P<0.05);观察组比对照组DNT中位数缩短220 min,差异有统计学意义(P<0.05);观察组从开具医嘱到完成眼底荧光血管造影时间、抽血结束至化验回报时间、接诊至完成CT时间、决策时间及手术安排时间比对照组均得到缩短,差异有统计学意义(P<0.01)。结论:实行眼-脑卒中绿色通道“双轨并行”治疗流程优化效果明显,缩短了DNT及各关键环节时间,提高CRAO患者治疗有效率。

2D Coupled 3D:A New Numerical Model for Dual - Structured - Aquifer System

This paper points out that a successful numerical simulation is to construct a correct conceptional model which is very dose to the natural condition. A new model, two dimensional coupled three dimensional model (2D -3D ) is presented in the Present paper,which is the most suitable one for the dual - structured - aquifer system. An example of Wenyinghu area is shown.By using the 2D-3D model, a satisfied result of the simulated area is achieved.

Fundamental Properties and Optimal Gains of a Steady-State Velocity Measured <i>α</i>-<i>β</i>Tracking Filter

This paper clarifies the steady-state properties and performance of an α-β filter for moving target tracking using both position and velocity measurements. We call this filter velocity measured α-β (VM-α-β) filter. We first derive the stability condition and steady-state predicted errors as fundamental properties of the VM-α-β filter. The optimal gains for representative motion models are then derived from the Kalman filter equations. Theoretical and numerical analyses verify that VM-α-β filters with these optimal gains realize more accurate tracking than conventional α-β filters when the filter gains are relatively large. Our study reveals the conditions under which the predicted errors of the VM-α-β filters are less than those of conventional α-β filters. Moreover, numerical simulations clarify that the variance of the tracking error of the VM-α-β filters is approximately 3/4 of that of the conventional α-β filters in realistic situations, even when the accuracy of the position/velocity measurements is the same.

双源CT、2D-STI在评估冠状动脉狭窄情况和左心室功能中的准确性及可行性研究

目的 研究双源CT、二维斑点追踪成像技术(2D-STI)在评估冠状动脉狭窄情况和左心室功能中的准确性及可行性研究。方法 选取106例我院2018年11月至2020年11月疑似冠心病患者,并经相关检查最终确诊104例。采用双源CT、2D-STI对了患者进行检查;并分析冠状动脉狭窄情况和左心室功能中的准确性及可行性。结果 双源CT检出疾病影像特征的百分率为65.38%(68/104),2D-STI检出疾病影像特征的百分率为82.69%(86/104),两项检查组检出疾病影像特征的百分率为97.11%(102/104),说明其对两项联合组的检出率较高(χ^(2)/P=37.782/0.001)。双源CT检出冠状动脉狭窄情况的百分率为78.84%(82/104),2D-STI检查检出冠状动脉狭窄情况的百分率为87.50%(91/104),两项检查组检出冠状动脉狭窄情况的百分率为99.03%(103/104),说明其对两项联合组的检出率较高(χ^(2)/P=20.912/0.001)。与双源CT检查、2D-STI检查、两项检查组检查左心室功能测量值,差异无统计学意义(P>0.05)。与双源CT、2D-STI相比,两项联合对冠状动脉狭窄情况和左心室功能的诊断敏感度、准确度较高,差异具有统计学意义(P<0.05)。ROC曲线显示,两项联合对冠状动脉狭窄情况和左心室功能的鉴别价值较高,差异具有统计学意义(P<0.05)。结论 双源CT联合2D-STI在冠状动脉狭窄情况和左心室功能中的诊断价值较为理想,可用于冠状动脉狭窄情况和左心室功能的临床诊断。

基于Anchor-free的孪生网络目标跟踪算法

基于anchor-free的目标预测方法相较于anchor-based方法速度更快,故设计一种基于anchor-free的孪生网络目标跟踪算法(AFSN)。通过对特征图、预测结果进行双重融合来提升跟踪效果,由深至浅对特征图进行堆叠融合,利用多层特征图进行目标预测,融合多个预测结果来稳定跟踪效果。采用anchor-free的目标预测方法,直接在像素点上进行目标类别的预测和边界框回归,避免了需设计大量锚点包围盒的问题。在GOT-10K数据集上,该算法的平均重叠率(AO)和成功率(SR_(0.75))相较于SiamRPN++算法提高了4.9和9.9百分点,算法处理速度可达每秒37帧。

“本质-情感”功能双轨制下竹制儿童衣架设计研究

本文提出了结合儿童生理和心理特性的“本质-情感”功能双轨制的设计方法,来解决竹制儿童家具产品设计中的风格塑造、功能配置同质化和单一化以及儿童的情感需求和身心关怀等问题。首先解析了本质功能和情感功能双轨制的概念,然后结合儿童生理心理各阶段的特点和当下儿童衣架市场现状的调研分析,以竹制儿童衣架产品为设计对象,提出本质功能和情感功能双轨制的设计方法,归纳出产品安全化、功能多元化、结构可拆卸化、部件扁平化、造型仿生化等设计原则,最后以笔者实际设计作品为案例,验证了本质功能和情感功能双轨制在产品设计中的可行性,同时也为儿童家具产品的设计研究提供了一种新的思路。

Singular perturbation composite control of a free-floating flexible dual-arm space robot

The Free-floating Flexible Dual-arm Space Robot is a highly nonlinear and coupled dynamics system. In this paper, the dynamic model is derived of a Free-floating Flexible Dual-arm Space Robot holding a rigid payload. Furthermore, according to the singular perturbation method, the system is separated into a slow subsystem representing rigid body motion of the robot and a fast subsystem representing the flexible link dynamics. For the slow subsystem, based on the second method of Lyapunov, using simple quantitative bounds on the model uncertainties, a robust tracking controller design is used during the trajectory tracking phase. The optimal control method is designed in the fast subsystem to guarantee the exponential stability. With the combination of the two above, the system can track the expected trajectory accurately, even though with uncertainty in model parameters, and its flexible vibration gets suppressed, too. Finally, some simulation tests have been conducted to verify the effectiveness of the proposed methods.

Comparison of three fluorescence labeling and tracking methods of endothelial progenitor cells in laser-injured retina

AIM： To compare three kinds of fluorescent probes for in vitro labeling and in vivo tracking of endothelial progenitor cells（EPCs） in a mouse model of laser-induced retinal injury.METHODS： EPCs were isolated from human umbilical cord blood mononuclear cells and labeled with three different fluorescent probes： 5-（and-6）-carboxyfluorescein diacetate succinimidyl ester（CFSE）, 1,1′-dilinoleyl-3,3,3′,3′-tetramethylindo-carbocyanine perchlorate linked acetylated low-density lipoprotein（Di I-Ac LDL）, and green fluorescent protein（GFP）. The fluorescent intensity of EPCs was examined by confocal microscopy. Survival rate of labeled EPCs was calculated with trypan blue staining, and their adhesive capability was assessed. A mouse model of retinal injury was induced by laser, and EPCs were injected into the vitreous cavity. Frozen section and fluorescein angiography on flat-mounted retinal samples was employed to track the labeled EPCs in vivo.RESULTS： EPCs labeled with CFSE and Di I-Ac LDL exhibited an intense green and red fluorescence at the beginning; the fluorescence intensity decreased gradually to 20.23% and 49.99% respectively, after 28 d. On the contrary, the florescent intensity of GFP-labeled EPCs increased in a time-dependent manner. All labeled EPCs showed normal morphology and no significant change in survival and adhesive capability. In the mouse model, transplantation of EPCs showed a protective effect against retinal injury. EPCs labeled with CFSE and Di I-Ac LDL were successfully tracked in mice during the development of retinal injury and repair; however, GFP-labeled EPCs were not detected in the laser-injured mouse retina.CONCLUSION： The three fluorescent markers used in this study have their own set of advantages and disadvantages. CFSE and Di I-Ac LDL are suitable for short-term EPClabeling, while GFP should be used for long-term labeling. The choice of fluorescent markers should be guided by the purpose of the study.