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基于ISSA-H_(∞)的水电机组鲁棒控制

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中国农村水利水电 2024年第4期 199-204页

作者：马元江陈金保谈泰权王凯肖志怀国网四川省电力公司映秀湾水力发电总厂四川阿坝623000 武汉大学动力与机械学院湖北武汉430072

随着风电、光伏等随机能源大量接入,电网结构变得复杂。在此背景下,水电机组将根据需要经常处于变工况运行,运行环境日趋恶劣,其传统的PID控制策略显然难以实现各种复杂工况下的最优控制。为此,将H_(∞)理论应用于水电机组,并基于改进... 详细信息

随着风电、光伏等随机能源大量接入,电网结构变得复杂。在此背景下,水电机组将根据需要经常处于变工况运行,运行环境日趋恶劣,其传统的PID控制策略显然难以实现各种复杂工况下的最优控制。为此,将H_(∞)理论应用于水电机组,并基于改进樽海鞘算法(ISSA)和综合ITAE指标对其参数进行优化,实现了基于ISSA-H_(∞)的水电机组自适应鲁棒控制。仿真结果表明,相比传统的PID控制器,设计的基于ISSA-H_(∞)的自适应鲁棒控制器在不同工况下均有优异的调节性能,实现了水电机组多工况下最优控制。

关键词：水电机组 PID控制 H_∞理论改进樽海鞘算法自适应鲁棒控制

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Exogenous electric field to accelerate wound healing

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Biomedical Engineering Communications 2024年第3期3卷 1-2页

作者： Kai-Qi Yang Jia chen Xiao-Mei Li Si-yuan Chang Yan-Jun Yang Yan-Ling Hu College of Material Engineering Fujian Agriculture and Forestry UniversityFuzhou 350108 China.2Medical Science and Technology Innovation Center School of RadiologyShandong First Medical University&Shandong Academy of Medical SciencesTai’an 271016 China.3School of Basic Medicine Medical College of Putian UniversityPutian 351100 China.4College of Life and Health Nanjing Polytechnic InstituteNanjing 210048 China.5School of Electrical and Computer Engineering College of EngineeringThe University of GeorgiaAthens 30602USA.

Wound healing is a critical physiological process in living organisms that includes repair cell proliferation and migration,etc.[1,2].While effective wound-healing treatment strategies have been developed in the past,few have actively controlled the behavior of skin cells to accelerate wound healing[3,4].The importance of accelerated wound healing lies in its ability to shorten treatment time,reduce the risk of infection,and lower the cost of *** stimulation can modulate cell behavior during wound healing by simulating endogenous electric fields,boosting cell migration,fibroblast proliferation,and granulation tissue growth more significantly than traditional methods[5-7].However,electrical stimulation devices’size,space limitations,and unsustainability make them challenging to use in clinical surgery,hindering real-time and convenient *** is therefore crucial to explore the miniaturization of electrical stimulation devices to advance the healing of skin wounds in clinical ***,chen et *** a flexible micro-Zn-MnO2(mZMB)battery-based woundplast for wound management,which shows a promising path in biomedical applications(Figure 1)[8].

关键词： healing wound stimulation

福建省3例输入性白喉棒状杆菌感染病例流行病学和病原学分析

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中国人兽共患病学报 2024年第6期40卷 590-594,598页

作者：李曲文梁雪晨高亚东翁顺太高源邵祝军福建省疾病预防控制中心(福建省人兽共患病研究重点实验室) 福州350012 福建医科大学公共卫生学院专业教学实习基地福州350012 福建医科大学公共卫生学院福州350122 中国疾病预防控制中心传染病预防控制所北京102206

目的对福建省发现的3例输入性白喉病例进行流行病学和病原学分析。方法对3例疑似皮肤白喉患者进行流行病学调查,采集患者皮肤破损的分泌物样品,进行白喉棒状杆菌分离培养。对纯培养的疑似白喉棒状杆菌进行生化鉴定和质谱分析,检测白喉... 详细信息

目的对福建省发现的3例输入性白喉病例进行流行病学和病原学分析。方法对3例疑似皮肤白喉患者进行流行病学调查,采集患者皮肤破损的分泌物样品,进行白喉棒状杆菌分离培养。对纯培养的疑似白喉棒状杆菌进行生化鉴定和质谱分析,检测白喉棒状杆菌(Diphtheria toxin repressor,dtxR)、(Toxin A,toxA)、(Toxin B,toxB)等毒力相关基因,进行MLST序列分型。结果3例病例有典型的皮肤白喉临床表现,皮肤破损部位均分离到白喉棒状杆菌。2例病例分离到的2株白喉棒状杆菌毒力基因检测结果为dtxR(+)、toxA(-)、toxB(-),MLST型别均为ST-703;1例病例分离的白喉棒状杆菌菌株毒力基因检测结果为dtxR(+)、toxA(+)、toxB(+),MLST型别为ST-248。结论福建省存在白喉输入性风险,非毒原菌亦可引起皮肤白喉。

关键词：白喉棒状杆菌毒力基因皮肤白喉

The 2022 record-breaking high temperature in China:Sub-seasonal stepwise enhanced characteristics,possible causes and its predictability

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Advances in Climate Change Research 2023年第5期14卷 651-659页

作者： yuan-yuan MA Yi-Ting chen Xiao-Xue HU Qian-Rong MA tai-chen FENG Guo-Ling FENG Di MA Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Physical Science and Technology Yangzhou UniversityYangzhou 225127China College of Atmospheric Sciences Lanzhou UniversityLanzhou 730000China School of Atmospheric Sciences Key Laboratory of Tropical Atmosphere-Ocean SystemMinistry of EducationSun Yat-sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519082China

In the summer of 2022,an unprecedented and long-lasting high temperature swept central-eastern China,causing significant societal ***,the sub-seasonal characteristics,causes and predictability of this extreme high temperature event are not well *** on the locations,intensities and causes of the high temperature,we divided it into three stages:early(13 June-3 July),sustained(4-28 July),and enhancement(29 July-30 August)*** high temperature during the early stage mainly occurred in north-central China with an anomaly of 2.5℃compared with climatology(1981-2010),while the last two stages occurred in the middle and lower Yangtze River Basin with anomalies of 2.8 and 3.8℃*** high temperature during the three stages were all regulated by the strengthening and westward extension of the western Pacific subtropical high(WPSH)but involved different physical *** the early stage,it was mainly caused by the anticyclones over the Mongolia and Northwest Pacific and enhanced by the minor impact of *** the sustained stage it was influenced by relatively more stronger WPSH and South Asia high(SAH)and the relatively minor impact of the anticyclone over the north-western South *** the enhancement stage,the high temperature was mainly caused by a combination of the record-breaking WPSH and SAH and the strong European blocking ***,the exceptionally powerful WPSH was well correlated with the sea surface temperature gradient induced by the developing La Niñ*** ECMWF and NCEP models reasonably predicted the location and intensity of the high temperature in the early stage,but poorly predicted that in the sustained and enhancement stages partly because of the failure prediction of the WPSH's enhancement and westward *** ECMWF model's more accurate prediction of the WPSH may contribute to its better forecasting of the heatwaves.

关键词： High temperature Sub-seasonal characteristics Western Pacific subtropical high La Niña development phase Predictability

Simulation on venting process and valve opening control method for gas trunk pipelines

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Petroleum Science 2022年第6期19卷 3016-3028页

作者： Li-Li Zuo An-tai Jin Qian chen Qin-Long Dong yuan-Xin Li Si-Rui Zhao National Engineering Laboratory for Pipeline Safety/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum(Beijing)Beijing102249China Petro China Planning&Engineering Institute Beijing100083China National Petroleum and Natural Gas Pipe Network Group Beijing Pipeline Co. Ltd.Beijing100101China

Determining the venting time of a gas trunk pipeline segment provides an important basis for formulating an emergency plan in the advent of unexpected *** the natural gas venting process corresponds to the transient flow,it is necessary to establish a transient hydraulic-thermal simulation model in order to determine the venting *** this paper,based on two kinds of venting scenarios in which there is only one venting point in the venting system of a gas trunk pipeline segment—namely,where the venting point is either at one of the two ends or at the junction of two gas trunk pipeline segments—transient hydraulic-thermal simulation models are *** models consist of gas flow governing equations,the gas state equation,gas physical property equations,initial conditions,and appropriate boundary *** implicit central difference method is used to discretize the gas flow partial differential equations,and the trust-region-dogleg algorithm is used to solve the equations corresponding to each time step,in order to dynamically simulate the whole venting *** judgment condition for the end of the venting process is that the average pressure of gas trunk pipeline segment is less than 0.11 MPa(actual pressure).Comparing the simulation results of the proposed model with those of the OLGA software and real operational data,we find that the venting time error is less than 10%.On this basis,a venting valve opening control principle is proposed,which prevents the venting noise from exceeded the specified noise value(85 d B)in the venting design of domestic gas pipeline *** established calculation model for venting time(dynamic simulation model)for a gas trunk pipeline segment and the proposed opening control principle of venting valve provide reference for the optimal operation of gas pipeline venting systems.

关键词： Gas pipeline Venting time Transient simulation Implicit central difference method Valve Opening Control Method

PHILOS钢板与Multiloc髓内钉治疗老年肱骨近端骨折的疗效比较

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新疆医学 2024年第4期54卷 431-435,446页

作者：张耀刘滨孟庆鑫陈彦兵马泰梁源新疆生产建设兵团第六师医院骨科中心新疆五家渠831300

目的探讨以PHILOS钢板与Multiloc髓内钉治疗老年肱骨近端骨折的临床疗效对比研究。方法研究分为PHILOS钢板组57和Multiloc髓内钉组49例,钢板组:男26例,女31例,年龄59岁-87岁,平均67.12±6.66岁,Neer分型2型23例,3型25例,4型9例。髓内钉... 详细信息

目的探讨以PHILOS钢板与Multiloc髓内钉治疗老年肱骨近端骨折的临床疗效对比研究。方法研究分为PHILOS钢板组57和Multiloc髓内钉组49例,钢板组:男26例,女31例,年龄59岁-87岁,平均67.12±6.66岁,Neer分型2型23例,3型25例,4型9例。髓内钉组:男21例,女28例,年龄60岁-78岁,平均69.49±6.10岁,Neer2型21例,3型20例,4型8例。记录手术时间、C型臂透视次数、出血量、骨折愈合时间、术后1年记录颈干角,肩关节功能JOA评分,分析并进行疗效评价。结果手术时间:钢板组60 min-180 min,平均112.75±4.70 min;髓内钉组50 min-130 min,平均79.79±3.10 min(t=6.336,P=0.001)有差异性。C型臂透视次数:钢板组6次-20次平均9.08±2.63次,髓内钉组6-12次平均9.57±2.35次(t=-1.032,P=0.307)无差异性;出血量:钢板组303.06±79.98 ml髓内钉组;265.31±55.16 ml(t=2.692,P=0.010)有差异性;钢板组随访12-16月,平均12.08±2.91月,髓内钉组随访13-18月,平均12.37±2.36月(t=-1.436,P=0.157)无差异性;术后一年颈干角:钢板组129.47±6.40°,髓内钉组133.33±4.93(t=-3.481,P=0.001)有差异性;术后一年JOA功能评分:钢板组:78.80±4.27分,髓内钉组80.29±3.86(t=-1.959,P=0.056)无差异性。内固定失效病例钢板组2例,肱骨头坏死1例。结论锁定钢板和髓内钉治疗肱骨近端骨折均是有效治疗方法,但髓内钉组在手术时间、出血量、骨折复位方面有优势。

关键词：肱骨近端骨折 PHILOS钢板 Multiloc髓内钉

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喷水式超声检测的声−流耦合模型

声学学报 2024年第5期49卷 1091-1098页

作者：董明贾浩驰陈渊曹现刚张广明万翔西安科技大学机械工程学院西安710054 陕西省矿山机电装备智能检测与控制重点实验室西安710054 利物浦约翰摩尔斯大学通用工程研究所英国利物浦L33AF

为研究超声波在射流水柱中的传播特性,提出了喷水式超声检测的声−流耦合建模方法。使用计算流体动力学方法得到喷水探头内部流场的湍动能、速度和压力,并通过弱形式偏微分方程将其映射到声学网格作为声场分析的边界条件,用线性纳维−斯... 详细信息

为研究超声波在射流水柱中的传播特性,提出了喷水式超声检测的声−流耦合建模方法。使用计算流体动力学方法得到喷水探头内部流场的湍动能、速度和压力,并通过弱形式偏微分方程将其映射到声学网格作为声场分析的边界条件,用线性纳维−斯托克斯方程求解湍动能、流速等引起的声学变化,建立了喷水式超声检测的声−流耦合模型。仿真计算了不同流速时工件内部的声压分布,进水口流速的变化不会改变工件中声压的分布规律,但空间声压幅值随着流速的增大而减小。仿真计算了不同流速时的平底孔回波,回波幅值随着流速的增大而减小,通过与实验结果对比,验证了本文方法的准确性。

关键词：喷水式超声检测声流耦合网格映射计算流体动力学

施氮与种间距离下大豆/玉米带状套作作物生长特性及其对产量形成的影响

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作物学报 2024年第1期50卷 251-264页

作者：杨立达任俊波彭新月杨雪丽罗凯陈平袁晓婷蒲甜雍太文杨文钰四川农业大学农学院/农业农村部西南作物生理生态与耕作重点实验室/四川省作物带状复合种植工程技术研究中心四川成都611130

为明确施氮和种间距离下套作作物生长特性及其对产量形成的影响。本文以大豆/玉米带状套作系统为研究主体,探究不同氮水平(施氮与不施氮)与种间距离(玉豆间距30、45、60和75 cm、单作100 cm)下作物生长率、干物质积累与分配及产量差异,... 详细信息

为明确施氮和种间距离下套作作物生长特性及其对产量形成的影响。本文以大豆/玉米带状套作系统为研究主体,探究不同氮水平(施氮与不施氮)与种间距离(玉豆间距30、45、60和75 cm、单作100 cm)下作物生长率、干物质积累与分配及产量差异,并对作物干物质积累过程进行拟合,综合分析作物生长规律和产量效益。结果表明:玉米生长率在抽雄期至乳熟期达最大,不施氮下以间距30 cm(MS30)最高,较玉米单作(MM100)高出34.99%。套作大豆生长率在初花期前显著低于单作(SS100),而初花期后高于SS100,以间距60cm(MS60)最高,盛花期—盛荚期在不施氮下较SS100高出78.91%。Logistic方程可较好的拟合玉米、大豆的干物质积累过程,且R2均在0.95以上。与不施氮相比,施氮推迟了玉米干物质积累高峰,提高了干物质积累量;套作大豆生育前期干物质积累慢于单作,而生育后期间距45cm(MS45)、MS60干物质积累逐渐与单作持平甚至超过单作。施氮提高了玉米籽粒干物质分配率而显著提高产量,2年间玉米产量分别提高10.05%、40.90%。随种间距离增加套作大豆产量呈先增后减趋势,以MS60最高,MS30最低,MS60两年间在不施氮与施氮下较MS30分别平均高出23.88%、31.77%。套作下土地当量比均在1.35以上,其中以施氮下MS60最大(1.89)。适宜的种间距离(间距60 cm)可实现套作下玉米和大豆协同生长,提高作物生长率、促进干物质积累与分配、提高系统产量和土地当量比。

关键词：大豆/玉米带状套作种间距离作物生长特性干物质积累与分配产量

广东阳春百涌自然保护区哺乳动物多样性及空间分布研究

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陕西林业科技 2024年第1期52卷 19-22,30页

作者：陈瑞炳吴世远陈圣来罗森元黎永泰丁向运阳江市野生动植物保护管理站广东阳江529500 广东阳春百涌省级自然保护区管理处广东阳春529623 广州林芳生态科技有限公司广州510520

2022年3-12月,采用红外相机技术调查了广东阳春百涌省级自然保护区内哺乳动物的物种多样性及空间分布。监测期间累计有6572个有效相机日,共拍摄到446组哺乳动物有效照片和视频数据;共记录8种陆生哺乳动物,隶属于4目7科,分别为:北树鼩(Tu... 详细信息

2022年3-12月,采用红外相机技术调查了广东阳春百涌省级自然保护区内哺乳动物的物种多样性及空间分布。监测期间累计有6572个有效相机日,共拍摄到446组哺乳动物有效照片和视频数据;共记录8种陆生哺乳动物,隶属于4目7科,分别为:北树鼩(Tupaia belangeri)、黄腹鼬(Mustela kathiah)、鼬獾(Melogale moschata)、花面狸(Paguma larvata)、豹猫(Prionailurus bengalensis)、野猪(Sus scrofa)、小麂(Muntiacus reevesi)、赤腹松鼠(Callosciurus erythraeus),7种为国家三有动物,1种为广东省重点保护陆生野生动物。

关键词：哺乳动物生物多样性空间分布红外相机