韩国TAC制度的实践及其对中国的启示

【目的】本研究旨在借鉴韩国的经验和做法,探讨中国渔业总可捕量(TAC)制度的管理方向,提高中国TAC制度管理的实效,实现中国海洋渔业可持续发展。【进展】TAC制度是重要的产出控制型渔业资源管理制度,对于促进中国渔业可持续发展具有重要意义。中国从2017年开始实施海洋渔业限额捕捞试点,由此开启对海洋渔业实行TAC管理的积极探索。目前中国渔业TAC管理处于起步阶段,存在法制不够健全、配额设定过高、监管力量不足等问题。为解决这些问题,本文选取了与中国情况类似的韩国TAC制度开展对比分析研究,阐述目前形势下中国实施TAC制度的必要性,介绍中韩两国TAC制度的实施现状,深入剖析韩国TAC制度的发展历程、实施过程、经验与不足。【结论】借鉴韩国的实践经验,有效地解决中国TAC初级阶段已存在的问题,同时汲取韩国TAC实施过程中的教训,提前做好中国TAC制度设计,避免因制度漏洞引发新的问题。基于中国国情与TAC实施现状,提出加强中国TAC管理的建议,包括建立系统的TAC法律法规体系,实施长期渔业资源监测,建立严密的TAC监管体系,以及提高公众对TAC制度的认识、教育和培训等,以期推动TAC制度在中国顺利实施,有效助推中国渔业实现绿色高质量发展。

基于语料库的中国形象建构研究——以“中国加入TAC”20周年相关报道为例

目的:2023年恰逢中国加入《东南亚友好合作条约》20周年,也是中国与东盟关系持续发展的重要节点,讲述中国故事,展现可信、可爱、可敬的中国形象,传播中国声音,是建设社会主义文化强国的重要内容。方法:文章使用文献计量可视化软件CiteSpace绘制基于语料库的国家形象研究的关键词共现知识图谱,然后基于语料库分析软件Antconc,以《中国日报》中“中国加入TAC”20周年相关报道为研究对象,分析主题词和检索行。结果:探究“中国加入TAC”20周年相关报道中建构的中国形象,从而为相关研究提供新视角和新模式。结论:研究发现,《中国日报》中“中国加入TAC”20周年相关报道建构了三类中国形象,具体表现为睦邻友好的中国伙伴形象、互利合作的中国经济形象、“全球事务积极参与者”的中国政治形象。

化学气相沉积生长TaC涂层的高通量热力学分析

为指导半导体高温炉构件用高纯TaC涂层的生长调控,采用Thermo-calc软件开展TaC涂层生长过程的高通量热力学模拟计算,研究了沉积温度、压强和前驱体组分比对原料利用效率和TaC涂层纯度等指标的影响。模拟结果表明,在“TaCl_(5)+C_(3)H_(6)+H_(2)”体系中,X(Ta)∶X(C)(摩尔分数比)决定了产物的物相组成,X(H)∶X(C)决定了高纯TaC涂层的形成窗口。当X(Ta)∶X(C)<1时,可以获得高质量TaC涂层,涂层中的主要杂质为游离碳,可以通过提高气氛中氢气的浓度来消除涂层中的游离碳杂质。根据模拟分析结果,推荐的反应窗口为:X(Ta)∶X(C)为0.8~1.0且X(H)∶X(C)≥400,沉积温度为1800~2100 K,沉积压强为5000~10000 Pa,可获得高纯度(>99%)和高原料利用率(>99%)的TaC涂层。

基于TACS地铁信号系统的项目室内点对点测试方案设计

列车自主运行系统(TACS)通过简化系统架构、细化资源管理、优化安全平台,以实现最佳的系统性能;确保降级模式下的稳健性;提供操作的灵活性;减少轨旁设备;降低维护成本。该文基于TACS系统架构,提出一种项目室内点对点测试的方案,详细阐述TACS地铁信号系统的项目点对点测试的对象、环境配置及测试策略等。

Recent advancements in continuously scalable conversion-ratio switched-capacitor converter

Switched-capacitor(SC)DC-DC converter[1]is an impor-tant alternative to inductive DC-DC converter,in terms of removing the bulky power inductor.Hence,it is widely used in low-profile,low-power applications,such as the internet of things(IoT)sensor nodes and energy harvesting[2].Mean-while,considering that capacitor has a much higher energy density than inductor,high-power applications.

中运量城市轨道交通应用TACS信号系统研究

目前国内城市轨道交通信号系统大多采用基于车地通信技术的CBTC,该系统存在轨旁设备多、维保工作量大和故障率偏高等问题。随着技术的发展及国内城市轨道交通运营需求的改变,基于车车通信技术的TACS应运而生。文章首先对TACS的架构组成与功能特点进行介绍,并与CBTC进行对比分析,阐明TACS的技术优势。其次,结合既有线路升级需求和信号系统改造的重难点,提出TACS工程应用实施思路,并以芜湖市轨道交通2号线为例,对中运量城市轨道交通既有CBTC改造为TACS所涉及的工程内容进行详细描述,分析改造工程实施的可行性。TACS系统作为CBTC的升级版,未来在城市轨道交通领域应用前景广阔。

Modeling the System for Hybrid Renewable Energy Using Highly Efficient Converters and Generator

High-efficient isolated DC/DC converters with a high-efficiency synchronous reluctance generator(SRG)are the ultimate solutions in DC microgrid systems.The design and modeling of isolated DC/DC converters with the performance of SRG are carried out.On the generator side,reactive and active powers are used as pulse width modulation(PWM)control variables.Further,the flux estimator is used.Three-phase PWM rectifier is used by applying space vector modulation(SVM)with a constant switching frequency for direct power control.Further,the paper also includes the experimental validation of the results.The paper also proposes that highly efficient power converters and synchronous reluctance generators are required to achieve high performance for hybrid renewable energy systems applications.

A real-time calibration method based on time-to-digital converter for accelerator timing system

The high-intensity heavy-ion accelerator facility(HIAF)is a scientific research facility complex composed of multiple cas-cade accelerators of different types,which pose a scheduling problem for devices distributed over a certain range of 2 km,involving over a hundred devices.The white rabbit,a technology-enhancing Gigabit Ethernet,has shown the capability of scheduling distributed timing devices but still faces the challenge of obtaining real-time synchronization calibration param-eters with high precision.This study presents a calibration system based on a time-to-digital converter implemented on an ARM-based System-on-Chip(SoC).The system consists of four multi-sample delay lines,a bubble-proof encoder,an edge controller for managing data from different channels,and a highly effective calibration module that benefits from the SoC architecture.The performance was evaluated with an average RMS precision of 5.51 ps by measuring the time intervals from 0 to 24,000 ps with 120,000 data for every test.The design presented in this study refines the calibration precision of the HIAF timing system.This eliminates the errors caused by manual calibration without efficiency loss and provides data support for fault diagnosis.It can also be easily tailored or ported to other devices for specific applications and provides more space for developing timing systems for particle accelerators,such as white rabbits on HIAF.

列车自主运行系统(TACS)在青岛地铁5号线的应用

研究了列车自主运行系统(TACS)在青岛地铁5号线的应用,在掌握工程概况的基础上,从方案比选、系统架构、列控系统、牵引系统、控制系统、网络控制系统、防撞系统等方面出发,分析了列车自主运行系统设计要点,有利于提高地铁信号系统设计水平,保障地铁交通的高效、安全、稳定运行。

Robust optical mode converter based on topological waveguide arrays

Optical mode converters are essential for enhancing the capacity of optical communication systems. However, fabrication errors restrict the further improvement of conventional mode converters. To address this challenge, we have designed an on-chip TE0–TE1mode converter based on topologically protected waveguide arrays. The simulation results demonstrate that the converter exhibits a mode coupling efficiency of 93.5% near 1550 nm and can tolerate a relative fabrication error of 30%. Our design approach can be extended to enhance the robustness for other integrated photonic devices, beneficial for future development of optical network systems.

Energy-Efficient Implementation of BCD to Excess-3 Code Converter for Nano-Communication Using QCA Technology

Code converters are essential in digital nano communication;therefore,a low-complexity optimal QCA layout for a BCD to Excess-3 code converter has been proposed in this paper.A QCA clockphase-based design technique was adopted to investigate integration with other complicated circuits.Using a unique XOR gate,the recommended circuit’s cell complexity has been decreased.The findings produced using the QCADesigner-2.0.3,a reliable simulation tool,prove the effectiveness of the current structure over earlier designs by considering the number of cells deployed,the area occupied,and the latency as design metrics.In addition,the popular tool QCAPro was used to estimate the energy dissipation of the proposed design.The proposed technique reduces the occupied space by∼40%,improves cell complexity by∼20%,and reduces energy dissipation by∼1.8 times(atγ=1.5EK)compared to the current scalable designs.This paper also studied the suggested structure’s energy dissipation and compared it to existing works for a better performance evaluation.

TAC新辅助化疗方案联合保乳术治疗Ⅱ期乳腺癌患者的效果

目的:观察TAC新辅助化疗方案联合保乳术治疗Ⅱ期乳腺癌患者的效果。方法:选取2020年2月至2022年2月该院收治的80例Ⅱ期乳腺癌患者进行前瞻性研究,按照随机数字表法将其分为对照组和研究组各40例。对照组采用保乳术治疗,研究组在对照组基础上联合TAC新辅助化疗方案治疗,比较两组保乳成功率,治疗前后肿瘤标志物[血清血管内皮生长因子(VEGF)、糖类抗原125(CA125)、糖类抗原15-3(CA15-3)、癌胚抗原(CEA)]水平、健康状态[卡氏功能状态评分表(KPS)]评分、生命质量[乳腺癌患者生命质量测定量表(FACT-B)]评分,以及术后14 d并发症发生率。结果:研究组保乳成功率为92.50%(37/40),高于对照组的75.00%(30/40),差异有统计学意义(P<0.05);治疗后,研究组CEA、VEGF、CA125、CA15-3水平均低于对照组,差异有统计学意义(P<0.05);治疗后,研究组KPS、FACT-B评分均高于对照组,差异有统计学意义(P<0.05);两组并发症发生率比较,差异无统计学意义(P>0.05)。结论:TAC新辅助化疗方案联合保乳术治疗Ⅱ期乳腺癌患者可提高保乳成功率、KPS评分和FACT-B评分,降低肿瘤标志物水平,效果优于单纯保乳术治疗。

柯乐猪TAC3R基因SNP位点鉴定及其对繁殖性状的影响

【目的】探究速激肽受体3基因(TAC3R)单核苷酸多态性(SNP)位点与柯乐猪繁殖性能的关联性,筛选出与繁殖性状相关的遗传标记,为加速柯乐猪的品种改良提供技术支撑。【方法】选取195头2胎以上的健康经产柯乐猪为研究对象,运用Sanger直接测序法鉴定TAC3R基因SNP位点,利用SHEsisPlus计算各SNP位点的群体遗传参数,并以SPSS 22.0中的一般线性模型(GLM)分析SNP位点基因型和双倍型对柯乐猪5个繁殖指标的遗传效应。【结果】在柯乐猪TAC3R基因上共检测到5个SNPs位点:g.117686266T>C、g.117686381A>G、g.117686384A>G、g.117688503T>C和g.117688518T>C。g.117686381A>G位点与g.117686384A>G位点间完全连锁,g.117688503T>C位点与g.117686266T>C、g.117686381A>G和g.117686384A>G位点间不存在连锁关系,而其他各SNP位点间均存在强连锁不平衡关系。5个SNPs位点联合共检测到5种单倍型和10种双倍型,单倍型中以H5的频率最高(0.433)、H2的频率最低(0.059),双倍型中以H3H5的频率最高(0.221)、H1H4的频率最低(0.031)。5个SNPs位点在柯乐猪群体中均呈中度多态性(0.25<PIC<0.50),且其基因型分布均未偏离Hardy-Weinberg平衡(χ^(2)-HWE<5.991)。g.117688503T>C位点显著影响窝均产仔数和断奶仔猪数,TT基因型个体的窝均产仔数和断奶仔猪数显著高于CC基因型个体;g.117688518T>C位点显著影响断奶仔猪数,CC基因型个体显著高于TT基因型个体。柯乐猪TAC3R基因SNP位点双倍型与其繁殖性状的关联分析发现,H2H4型为窝均产仔数、窝均产活仔数和窝断奶仔猪数3个指标的最优双倍型,H1H3型为平均断奶重指标的最优双倍型。【结论】在柯乐猪TAC3R基因上检测到5个SNPs位点,其中g.117688503T>C和g.117688518T>C位点对柯乐猪的繁殖性能有显著影响。TAC3R基因可作为柯乐猪繁殖性状的候选基因,双倍型H2H4可作为分子标记辅助选择的参考。

Hydrodynamic Performance of An Integrated System of Breakwater and A Multi-Chamber OWC Wave Energy Converter

A multi-chamber oscillating water column wave energy converter(OWC-WEC)integrated to a breakwater is investigated.The hydrodynamic characteristics of the device are analyzed using an analytical model based on the linear potential flow theory.A pneumatic model is employed to investigate the relationship between the air mass flux in the chamber and the turbine characteristics.The effects of chamber width,wall draft and wall thickness on the hydrodynamic performance of a dual-chamber OWC-WEC are investigated.The results demonstrate that the device,with a smaller front wall draft and a wider rear chamber exhibits a broader effective frequency bandwidth.The device with a chamber-width-ratio of 1:3 performs better in terms of power absorption.Additionally,results from the analysis of a triplechamber OWC-WEC demonstrate that reducing the front chamber width and increasing the rearward chamber width can improve the total performance of the device.Increasing the number of chambers from 1 to 2 or 3 can widen the effective frequency bandwidth.

Negative Stiffness Mechanism on An Asymmetric Wave Energy Converter by Using A Weakly Nonlinear Potential Model

Salter's duck,an asymmetrical wave energy converter(WEC)device,showed high efficiency in extracting energy from 2D regular waves in the past;yet,challenges remain for fluctuating wave conditions.These can potentially be addressed by adopting a negative stiffness mechanism(NSM)in WEC devices to enhance system efficiency,even in highly nonlinear and steep 3D waves.A weakly nonlinear model was developed which incorporated a nonlinear restoring moment and NSM into the linear formulations and was applied to an asymmetric WEC using a time domain potential flow model.The model was initially validated by comparing it with published experimental and numerical computational fluid dynamics results.The current results were in good agreement with the published results.It was found that the energy extraction increased in the range of 6%to 17%during the evaluation of the effectiveness of the NSM in regular waves.Under irregular wave conditions,specifically at the design wave conditions for the selected test site,the energy extraction increased by 2.4%,with annual energy production increments of approximately 0.8MWh.The findings highlight the potential of NSM in enhancing the performance of asymmetric WEC devices,indicating more efficient energy extraction under various wave conditions.

Extreme Responses of An Integrated System with A Semi-Submersible Wind Turbine and Four Torus-Shaped Wave Energy Converters in Different Survival Modes

Offshore wind power is a kind of important clean renewable energy and has attracted increasing attention due to the rapid consumption of non-renewable energy.To reduce the high cost of energy,a possible try is to utilize the combination of wind and wave energy considering their natural correlation.A combined concept consisting of a semi-submersible wind turbine and four torus-shaped wave energy converters was proposed and numerically studied under normal operating conditions.However,the dynamic behavior of the integrated system under extreme sea conditions has not been studied yet.In the present work,extreme responses of the integrated system under two different survival modes are evaluated.Fully coupled time-domain simulations with consideration of interactions between the semi-submersible wind turbine and the torus-shaped wave energy converters are performed to investigate dynamic responses of the integrated system,including mooring tensions,tower bending moments,end stop forces,and contact forces at the Column-Torus interface.It is found that the addition of four tori will reduce the mean motions of the yaw,pitch and surge.When the tori are locked at the still water line,the whole integrated system is more suitable for the survival modes.

TACS自主创新引领新质生产力,赋能轨道交通高质量发展

TACS(列车自主运行系统)是指以列车为核心,采用资源管理理念,基于车车通信,以信号系统与车辆深度融合为特征,实现列车运行方式由自动化向自主化转变的一种全新系统制式。2024年4月26日,TACS示范工程——青岛地铁6号线开通,标志着采用以列车为核心、以资源交互为基础的新型列车控制系统已进入商用阶段。

ANovel Non-Isolated Cubic DC-DC Converter with High Voltage Gain for Renewable Energy Power Generation System

In recent years,switched inductor(SL)technology,switched capacitor(SC)technology,and switched inductor-capacitor(SL-SC)technology have been widely applied to optimize and improve DC-DC boost converters,which can effectively enhance voltage gain and reduce device stress.To address the issue of low output voltage in current renewable energy power generation systems,this study proposes a novel non-isolated cubic high-gain DC-DC converter based on the traditional quadratic DC-DC boost converter by incorporating a SC and a SL-SC unit.Firstly,the proposed converter’s details are elaborated,including its topology structure,operating mode,voltage gain,device stress,and power loss.Subsequently,a comparative analysis is conducted on the voltage gain and device stress between the proposed converter and other high-gain converters.Then,a closed-loop simulation system is constructed to obtain simulation waveforms of various devices and explore the dynamic performance.Finally,an experimental prototype is built,experimental waveforms are obtained,and the experimental dynamic performance and conversion efficiency are analyzed.The theoretical analysis’s correctness is verified through simulation and experimental results.The proposed converter has advantages such as high voltage gain,low device stress,high conversion efficiency,simple control,and wide input voltage range,achieving a good balance between voltage gain,device stress,and power loss.The proposed converter is well-suited for renewable energy systems and holds theoretical significance and practical value in renewable energy applications.It provides an effective solution to the issue of low output voltage in renewable energy power generation systems.

基于TACS系统的列车中央控制单元软件设计与开发

为了实现对TACS列车的控制和管理,提出了一种列车中央控制单元软件设计与开发方法。首先介绍了基于多网融合理念的TACS列车网络控制系统架构;然后描述了基于CODESYS和QNX平台的软件设计流程,并开发了中央控制单元的驱动程序、逻辑程序和通信程序;最后以青岛地铁6号线车辆为应用对象,搭建自动化测试平台进行软件测试,证明了自研软件可以满足地铁列车的控制需求。

Study and Production of a Two-Stage DC/DC DC/AC Converter for Generating an Alternating Voltage from a Direct Voltage Supplied by a Photovoltaic Array

This article presents an ongoing study of the design of a DC-AC inverter using a single renewable energy source. The proposed approach makes it possible to produce an output with an H-bridge or full bridge and a single energy source. To this end, the performance of the inverter was studied first by means of a simulation and then with the implementation of an experimental device.