A novel multi-channel porous structure facilitating mass transport towards highly efficient alkaline water electrolysis

An advantageous porous architecture of electrodes is pivotal in significantly enhancing alkaline water electrolysis(AWE)efficiency by optimizing the mass transport mechanisms.This effect becomes even more pronounced when aiming to achieve elevated current densities.Herein,we employed a rapid and scalable laser texturing process to craft novel multi-channel porous electrodes.Particularly,the obtained electrodes exhibit the lowest Tafel slope of 79 mV dec^(-1)(HER)and 49 mV dec^(-1)(OER).As anticipated,the alkaline electrolyzer(AEL)cell incorporating multi-channel porous electrodes(NP-LT30)exhibited a remarkable improvement in cell efficiency,with voltage drops(from 2.28 to 1.97 V)exceeding 300 mV under 1 A cm^(-1),compared to conventional perforated Ni plate electrodes.This enhancement mainly stemmed from the employed multi-channel porous structure,facilitating mass transport and bubble dynamics through an innovative convection mode,surpassing the traditional convection mode.Furthermore,the NP-LT30-based AEL cell demonstrated exceptional durability for 300 h under 1.0 A cm^(-2).This study underscores the capability of the novel multi-channel porous electrodes to expedite mass transport in practical AWE applications.

Design of Cold-Junction Compensation and Disconnection Detection Circuits of Various Thermocouples and Implementation of Multi-Channel Interfaces Using Them-A Secondary Publication

Cold-junction compensation(CJC)and disconnection detection circuit design of various thermocouples(TC)and multi-channel TC interface circuits were designed.The CJC and disconnection detection circuit consists of a CJC semiconductor device,an instrumentation amplifier(IA),two resistors,and a diode for disconnection detection.Based on the basic circuit,a multi-channel interface circuit was also implemented.The CJC was implemented using compensation semiconductor and IA,and disconnection detection was detected by using two resistors and a diode so that IA input voltage became-0.42 V.As a result of the experiment using R-type TC,the error of the designed circuit was reduced from 0.14 mV to 3μV after CJC in the temperature range of 0°C to 1400°C.In addition,it was confirmed that the output voltage of IA was saturated from 88 mV to-14.2 V when TC was disconnected from normal.The output voltage of the designed circuit was 0 V to 10 V in the temperature range of 0°C to 1400°C.The results of the 4-channel interface experiment using R-type TC were almost identical to the CJC and disconnection detection results for each channel.The implemented multi-channel interface has a feature that can be applied equally to E,J,K,T,R,and S-type TCs by changing the terminals of CJC semiconductor devices and adjusting the IA gain.

Multi-channel terahertz focused beam generator based on shared-aperture metasurface

Most of existing metasurfaces usually have limited channel behavior,which seriouslyhinders their development and application.In this paper,we propose a multi-channel terahertz focused beam generator based on shared-aperture metasurface,and the generator consists of a top square metal strip,a middle layer of silica and a metal bottom plate.By changing the position and size of the shared-aperture array,the designed metasurface can generate any number of multi-channel focusing beams at different predicted positions.In addition,the energy intensity of focusing beams can be controlled.The full-wave simulation results show that the metasurface achieves four-channel vortex focused beam generation with different topological charges,and five-,six-,eight-channel focused beam generation with different energy intensities at a frequency of 1 THz,which are in good agreement with the theoretically calculated predictions.This work can provide a new idea for designing the terahertz multichannel devices.

Fast pre-stack multi-channel inversion constrained by seismic reflection features

Classical multi-channel technology can significantly reduce the pre-stack seismic inversion uncertainty, especially for complex geology such as high dipping structures. However, due to the consideration of complex structure or reflection features, the existing multi-channel inversion methods have to adopt the highly time-consuming strategy of arranging seismic data trace-by-trace, limiting its wide application in pre-stack inversion. A fast pre-stack multi-channel inversion constrained by seismic reflection features has been proposed to address this issue. The key to our method is to re-characterize the reflection features to directly constrain the pre-stack inversion through a Hadamard product operator without rearranging the seismic data. The seismic reflection features can reflect the distribution of the stratum reflection interface, and we obtained them from the post-stack profile by searching the shortest local Euclidean distance between adjacent seismic traces. Instead of directly constructing a large-size reflection features constraint operator advocated by the conventional methods, through decomposing the reflection features along the vertical and horizontal direction at a particular sampling point, we have constructed a computationally well-behaved constraint operator represented by the vertical and horizontal partial derivatives. Based on the Alternating Direction Method of Multipliers (ADMM) optimization, we have derived a fast algorithm for solving the objective function, including Hadamard product operators. Compared with the conventional reflection features constrained inversion, the proposed method is more efficient and accurate, proved on the Overthrust model and a field data set.

Opportunistic Routing with Multi-Channel Cooperative Neighbour Discovery

Due to the scattered nature of the network,data transmission in a dis-tributed Mobile Ad-hoc Network(MANET)consumes more energy resources(ER)than in a centralized network,resulting in a shorter network lifespan(NL).As a result,we build an Enhanced Opportunistic Routing(EORP)protocol architecture in order to address the issues raised before.This proposed routing protocol goal is to manage the routing cost by employing power,load,and delay to manage the routing energy consumption based on theflooding of control pack-ets from the target node.According to the goal of the proposed protocol techni-que,it is possible to manage the routing cost by applying power,load,and delay.The proposed technique also manage the routing energy consumption based on theflooding of control packets from the destination node in order to reduce the routing cost.Control packet exchange between the target and all the nodes,on the other hand,is capable of having an influence on the overall efficiency of the system.The EORP protocol and the Multi-channel Cooperative Neighbour Discovery(MCCND)protocol have been designed to detect the cooperative adja-cent nodes for each node in the routing route as part of the routing path discovery process,which occurs during control packet transmission.While control packet transmission is taking place during the routing path discovery process,the EORP protocol and the Multi-channel Cooperative Neighbour Discovery(MCCND)protocol have been designed to detect the cooperative adjacent nodes for each node in the routing.Also included is a simulation of these protocols in order to evaluate their performance across a wide range of packet speeds using Constant Bit Rate(CBR).When the packet rate of the CBR is 20 packets per second,the results reveal that the EORP-MCCND is 0.6 s quicker than the state-of-the-art protocols,according to thefindings.Assuming that the CBR packet rate is 20 packets per second,the EORP-MCCND achieves 0.6 s of End 2 End Delay,0.05 s of Routing Overhead Delay,120 s of Network Lifetime,and 20 J of Energy Consumption efficiency,which is much better than that of the state-of-the-art protocols.

程序自动并行化工具FAX

该文介绍了大规模并行处理系统程序自动并行化工具FAX（FortranAutomatedXlator）的系统概况。重点阐述了FAX中所采用的先进技术。测试结果表明，FAX已具备一定的可用性及有效性，作为面向分布主存并行机系统的程序自动并行化工具，基本达到了设计目标。

哈里斯FAX 10k调频发射机技术分析

本文主要介绍了HARRIS FAX 10k调频发射机的系统组成及其工作原理,并结合实际工作经验,对该型发射机的技术特点和应用优势进行了分析。

FAX/MODEM远程通信技术

本文首先介绍了开发Windows事件驱动的串行通信编程原理及方法,然后简述了FAX/MODEM的控制方式,接着详细论述了一个远程监视系统的编程例子。文章最后还探讨了技术的应用途径。

Blockchain-Enabled Privacy Protection and Access Control Scheme Towards Sensitive Digital Assets Management

With the growth of requirements for data sharing,a novel business model of digital assets trading has emerged that allows data owners to sell their data for monetary gain.In the distributed ledger of blockchain,however,the privacy of stakeholder's identity and the confidentiality of data content are threatened.Therefore,we proposed a blockchainenabled privacy-preserving and access control scheme to address the above problems.First,the multi-channel mechanism is introduced to provide the privacy protection of distributed ledger inside the channel and achieve coarse-grained access control to digital assets.Then,we use multi-authority attribute-based encryption(MAABE)algorithm to build a fine-grained access control model for data trading in a single channel and describe its instantiation in detail.Security analysis shows that the scheme has IND-CPA secure and can provide privacy protection and collusion resistance.Compared with other schemes,our solution has better performance in privacy protection and access control.The evaluation results demonstrate its effectiveness and practicability.

Beamline design for multipurpose muon beams at CSNS EMuS

A new muon beam facility,called the Experimental Muon Source(EMuS),was proposed for construction at the China Spallation Neutron Source(CSNS).The design of the complex muon beamlines for the EMuS baseline scheme,which is based on superconducting solenoids,superferric dipoles and room-temperature magnets,is presented herein.Various muon beams,including surface muons,decay muons and low energy muons,have been developed for multipurpose applications.The optics design and simulation results of the trunk beamline and branch beamlines are presented.With a proton beam power of 25 kW at a standalone target station that consists of a conical graphite target and high-field superconducting solenoids,the muon beam intensity in the trunk beamline varies from 10^(7)/s for surface muons to 10^(10)/s for high-momentum decay muons.And at the endstations,these values vary from 10^(5)/s for surface muons to 10^(8)/s for decay muons.

一种基于G3 FAX的CDMA网络无线传真终端协议的实现

在阐述了无线传真协议结构的基础上,给出了一种基于G3FAX的CDMA网络无线传真终端协议的实现过程。

Parametric study on contact sensors for MASW measurement-based interfacial debonding detection for SCCS

Steel-concrete composite structures(SCCS)have been widely used as primary load-bearing components in large-scale civil infrastructures.As the basis of the co-working ability of steel plate and concrete,the bonding status plays an essential role in guaranteeing the structural performance of SCCS.Accordingly,efficient non-destructive testing(NDT)on interfacial debondings in SCCS has become a prominent research area.Multi-channel analysis of surface waves(MASW)has been validated as an effective NDT technique for interfacial debonding detection for SCCS.However,the feasibility of MASW must be validated using experimental measurements.This study establishes a high-frequency data synchronous acquisition system with 32 channels to perform comparative verification experiments in depth.First,the current sensing approaches for high-frequency vibration and stress waves are summarized.Secondly,three types of contact sensors,namely,piezoelectric lead-zirconate-titanate(PZT)patches,accelerometers,and ultrasonic transducers,are selected for MASW measurement.Then,the selection and optimization of the force hammer head are performed.Comparative experiments are carried out for the optimal selection of ultrasonic transducers,PZT patches,and accelerometers for MASW measurement.In addition,the influence of different pasting methods on the output signal of the sensor array is discussed.Experimental results indicate that optimized PZT patches,acceleration sensors,and ultrasonic transducers can provide efficient data acquisition for MASW-based non-destructive experiments.The research findings in this study lay a solid foundation for analyzing the recognition accuracy of contact MASW measurement using different sensor arrays.

基于Multi-Radio Multi-Channel传感器网络无冲突信道分配算法的研究

为降低通信冲突和信道干扰,对Mult-i Radio Mult-i Channel传感器网络无冲突信道进行研究,结果证实在网络通信半径大于3倍的网络最大功率通信半径的前提下,Sensor节点规模满足2倍网络功率级数加1的环境下,网络无冲突信道分配的信道数达到网络信道冲突图的最大值。文章通过对无冲突信道算法的运用,最终证实其可以有效地提高传感器网络的工作效率,大幅度提升网络的吞吐量。

LS-CT/FAX多功能电报分集器的综合性设计与实现

本文介绍了一种新型多功能电报分集器LS－CT／FAX的系统结构、功能特性及软硬件设计原理、关键技术。LS－CT／FAX整个系统由电报分集、终端操作和传真分发处理三大部分组成。以研华工控机为基础的硬件开发设计，加之功能完善、实时性强的电报／传真处理软件，突出了LS－CT／FAX结构合理、功能齐全、易于推广应用的特点。

哈里斯FAX 10k调频发射机射频切换电路分析

本文简要介绍了哈里斯FAX 10k调频发射机的射频通路情况,并结合实际工作经验,着重分析了射频切换板的电路结构和工作原理。

创建CALL/FAX与MIS数据接口的一种实效方法

通过实际开发的CALL+FAX+MIS系统,完整地提出并建立一套数据接口实现技术方法,对多平台、跨平台以及不同环境下开发的应用系统进行企业级多用户数据传递、交互、数据监控、数据共享发挥了实效的作用。通过实践证明,这种实现数据接口的方法在逻辑上严密、清晰、简单、规范,实用性强,将会得到广泛应用。

Discussion on the Status Quo of Vocational College Students’Self-Image and its Improvement Strategies

An individual’s self-image is a multi-dimensional and multi-structural concept.Its internal dimensions include ability,knowledge,values,personality,and temperament,and its external dimensions are physical appearance,behavior,and clothing.A good image will have a positive impact both in life and at work.We will choose appropriate clothing and makeup to modify the external image and cultivate positive qualities such as correct values and an optimistic attitude towards life to enhance internal dimensions.Among them,“personality”and“ability”mostly belong to the research category of mental health education,and“values”fit in the research field of ideological and political education.Ideological and political education and mental health education are both important components of higher education,which show similarities between them.Ideological and political education and mental health education can complement each other in many ways to enhance students’self-image.

基于FAX/40E电话语音/传真卡的通信技术研究

以一个基于 FAX/ 40 E电话语音 /传真卡技术的传真系统为例 ,重点研究 FAX/ 40 E电话语音 /传真卡技术与计算机之间的通信技术 ,并讨论有关多线程技术问题。

油棕脂肪酸外运蛋白基因FAX1的克隆及表达分析

油棕(Elaeis guineensis Jacq.)原产非洲,是重要的热带木本油料作物,产油效率极高。目前油棕广泛种植在东南亚、非洲、中南美洲和我国的海南、云南、广东、广西等省(区),油棕果实压榨的棕榈油是重要的食用油和工业原料。脂肪酸在植物质体中合成,然后转运到内质网上进行加工和修饰。为了研究油棕脂肪酸的转运机制,以‘热油4号’油棕为研究对象,采用生物信息学和荧光定量PCR挖掘控制油棕脂肪酸转运的关键基因。脂肪酸外运蛋白1(fatty acid export 1, FAX1)是植物脂肪酸转运蛋白,介导细胞内脂肪酸从质体向外运输,在脂质合成中起着重要的调控作用。本研究从油棕中克隆了3个EgFAX1基因(EgFAX1-1,EgFAX1-2,EgFAX1-3),对其氨基酸长度、分子量、等电点、蛋白不稳定指数、脂肪族系数、总平均亲水性、染色体定位、基因结构、保守功能域、进化关系和表达特征进行分析。结果表明:3个EgFAX1基因编码的肽链氨基酸长度分别为189、231和232,分子量分别为20.43、24.85、24.92 kDa,等电点为分别9.82、9.82和9.93,蛋白不稳定指数分别为48.01、49.71和50.09,脂肪族系数分别为81.06、84.07和83.28,总平均亲水性分别为为0.071、0.121和0.106,分别含有2、5、7个外显子,都含有FAX1的特征结构Tmemb;4蛋白结构域。将油棕与拟南芥、水稻、大豆、油菜、番茄、绿藻、红藻、盘藻、团藻、长囊水云、细小微胞藻和小球藻的FAX1氨基酸序列做进化分析,发现EgFAX1与大豆和番茄的亲缘关系较近。采用荧光定量PCR分析3个EgFAX1基因EgFAX1在油棕根、茎、叶、花和果中的表达特征,发现EgFAX1在花和果实中的表达量较高;同时分析3个EgFAX1基因油棕花后15周、17周、21周和23周果实中的表达特征,发现3个EgFAX1基因均在油棕果实发育过程中先升高,到达峰值后逐渐降低,其中EgFAX1-1在花后17周的果实达到峰值,EgFAX1-2和EgFAX1-3在花后21周的果实中达到峰值。本研究为进一步探索EgFAX1调控油棕脂肪酸运输的机制奠定基础。