检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

一次冻雨天气的云雷达回波特征分析

气象科技 2018年第6期46卷 1232-1239页

作者：雷之雨郑佳锋朱克云张杰程志刚成都信息工程大学大气科学学院高原大气与环境四川省重点实验室成都610225

利用2014年12月10—12日的地面和探空资料、ECWMF再分析资料、Ka波段毫米波云雷达资料,采用特征分析、物理诊断量方法及回波特征分析方法,得到了较天气雷达更精细的垂直微观特征,对贵州冻雨的形成和演变提供了新的观测事实。结果表明:(1... 详细信息

利用2014年12月10—12日的地面和探空资料、ECWMF再分析资料、Ka波段毫米波云雷达资料,采用特征分析、物理诊断量方法及回波特征分析方法,得到了较天气雷达更精细的垂直微观特征,对贵州冻雨的形成和演变提供了新的观测事实。结果表明:(1)此次冻雨过程地面温度在0℃附近,且云系形成后的温度随高度下降始终维持在-10～0℃之间,为过冷暖雨过程。(2)冻雨在初生、成熟及消亡阶段的回波强度随高度下降逐渐增大,强度值为-30～12dBz。空气垂直速度集中在-0.4～1.6m/s之间,粒子下落速度集中在2.4m/s以内。(3)冻雨初生及消亡阶段上升运动弱,粒子尺寸小。成熟期间,上升气流加强,小粒子所占比例减小,大粒子增多。云体中下部谱宽大值区和强反射率因子对应,反映了液态过冷水下落过程中的碰并增长结果。

关键词：贵州冻雨毫米波云雷达云垂直结构和特征

在线全文

学校读者我要写书评

暂无评论

四川上二叠统老龙洞生物礁及其成岩作用

石油与天然气地质 1985年第1期 82-90页

作者：强子同郭一华张帆严传太郑家凤西南石油学院

老龙洞生物礁是笔者于1983年4月发现的。它位于四川省重庆市北碚区东北的天府煤矿地区的代家沟公社与文星公社之间(图1),交通十分方便。大地构造上属于扬

关键词：生物礁成岩作用地质作用方解石胶结物上二叠统老龙洞

Homologous Strategy to Construct High‑Performance Coupling Electrodes for Advanced Potassium‑Ion Hybrid Capacitors

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2021年第1期13卷 289-302页

作者： Ying Xu jiafeng Ruan Yuepeng Pang Hao Sun Chu Liang Haiwen Li Junhe Yang Shiyou zheng School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093People’s Republic of China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014People’s Republic of China International Research Center for Hydrogen Energy Kyushu UniversityFukuoka 819‑0395Japan

Potassium-ion hybrid capacitors(PIHCs)have been considered as promising potentials in mid-to large-scale storage system applications owing to their high energy and power ***,the process involving the intercalation of K+into the carbonaceous anode is a sluggish reaction,while the adsorption of anions onto the cathode surface is relatively faster,resulting in an inability to exploit the advantage of high *** achieve a high-performance PIHC,it is critical to promote the K^+insertion/desertion in anodic materials and design suitable cathodic materials matching the *** this study,we propose a facile“homologous strategy”to construct suitable anode and cathode for high-performance PIHCs,that is,unique multichannel carbon fiber(MCCF)-based anode and cathode materials are firstly prepared by electrospinning,and then followed by sulfur doping and KOH activation treatment,*** to a multichannel structure with a large interlayer spacing for introducing S in the sulfur-doped multichannel carbon fiber(S-MCCF)composite,it presents high capacity,super rate capability,and long cycle stability as an anode in potassium-ion *** cathode composite of activated multichannel carbon fiber(aMCCF)has a considerably high specific surface area of 1445 m^2 g^−1 and exhibits outstanding capacitive *** particular,benefiting from advantages of the fabricated S-MCCF anode and aMCCF cathode by homologous strategy,PIHCs assembled with the unique MCCF-based anode and cathode show outstanding electrochemical performance,which can deliver high energy and power densities(100 Wh kg^−1 at 200 W kg^−1,and 58.3 Wh kg^−1 at 10,000 W kg^−1)and simultaneously exhibit superior cycling stability(90%capacity retention over 7000 cycles at 1.0 A g^−1).The excellent electrochemical performance of the MCCF-based composites for PIHC electrodes combined with their simple construction renders such materials attractive for further in-depth investigations of alkali-ion

关键词： Carbon fibers Potassium-ion capacitor Alkali-ion battery

优化施肥调控对连作烤烟农艺性状和产质量的影响

在线全文

学校读者我要写书评

暂无评论

中国农学通报 2024年第6期40卷 53-56页

作者：查宏波赵芳吕家锋龚林陈华高顺波王文栋郑兴琪孙浩宸张倍云南省烟草公司昭通市公司云南昭通657000

为探索昭阳烟区不同连作年限烟地施肥对烤烟生长发育和产质量的影响,通过小面积同田对比优化施肥调控试验,分别对连作3、6、9年及轮作烟田,处理采取移栽时30%复合肥+氯化钾穴施,70%复合肥环施,团棵追施硝酸钾、硫酸钾、硫酸镁的施肥方式... 详细信息

为探索昭阳烟区不同连作年限烟地施肥对烤烟生长发育和产质量的影响,通过小面积同田对比优化施肥调控试验,分别对连作3、6、9年及轮作烟田,处理采取移栽时30%复合肥+氯化钾穴施,70%复合肥环施,团棵追施硝酸钾、硫酸钾、硫酸镁的施肥方式;同田对照采取移栽时复合肥环施+团棵追施硝酸钾、硫酸钾的施肥方式。结果表明:优化施肥调控处理可以改善连作烟地烟株农艺性状,增强烤烟抗逆性,降低病害发生,提高烤烟产量、产值、均价和上等烟比例,改善初烤烟叶化学成分协调性。

关键词：烤烟优化施肥连作农艺性状产质量

不同维持量枸橼酸咖啡因对早产儿呼吸暂停的疗效观察

在线全文

学校读者我要写书评

暂无评论

儿科药学杂志 2018年第8期24卷 20-23页

作者：孙璐双林新宇郑家峰刘玮王小静张立明潍坊医学院山东潍坊261053 潍坊市人民医院山东潍坊261041

目的:探讨不同维持量枸橼酸咖啡因对早产儿原发性呼吸暂停(AOP)的疗效。方法:选择2015年12月至2017年4月潍坊市人民医院新生儿科收治的胎龄28~34周的AOP患儿共128例,随机分为治疗组和对照组各64例。两组患儿均给予一般治疗和枸橼酸咖啡... 详细信息

目的:探讨不同维持量枸橼酸咖啡因对早产儿原发性呼吸暂停(AOP)的疗效。方法:选择2015年12月至2017年4月潍坊市人民医院新生儿科收治的胎龄28~34周的AOP患儿共128例,随机分为治疗组和对照组各64例。两组患儿均给予一般治疗和枸橼酸咖啡因首剂20 mg/kg,对照组治疗24 h后枸橼酸咖啡因维持量5 mg/(kg·d),治疗组治疗24 h后枸橼酸咖啡因维持量10 mg/(kg·d),均为每日静脉注射1次,应用至呼吸暂停停止发作后7 d。比较两组患儿临床疗效、呼吸暂停发作频次、呼吸暂停消失时间、用药时间、呼吸机使用情况及不良反应发生情况等。结果:治疗组用药1 d后的呼吸暂停发作频率为(3.4±1.1)次/天,呼吸暂停消失时间为(2.7±0.8)d,用药时间为(9.8±0.5)d,上机时间为(3.1±0.7)d;对照组药1 d后呼吸暂停发作频率为(5.4±1.5)次/天,呼吸暂停消失时间为(4.5±2.2)d,用药时间为(11.6±0.9)d,上机时间为(5.8±1.5)d,两组比较差异均有统计学意义(P0.05)。结论:枸橼酸咖啡因治疗AOP时,大剂量较一般维持量更有效,且不良反应发生情况未见明显增加。

关键词：早产儿原发性呼吸暂停枸橼酸咖啡因维持量

Photothermal/matrix metalloproteinase-2 dual-responsive gelatin nanoparticles for breast cancer treatment

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2021年第1期11卷 271-282页

作者： Xiaojie Chen jiafeng Zou Ke Zhang Jingjing Zhu Yue Zhang Zhihong Zhu Hongyue zheng Fanzhu Li Ji-Gang Piao College of Pharmaceutical Sciences Zhejiang Chinese Medical UniversityHangzhou 310053China Libraries of Zhejiang Chinese Medical University Zhejiang Chinese Medical UniversityHangzhou 310053China

The chemotherapy combined with photothermal therapy has been a favorable approach for the treatment of breast *** present study,nanoparticles with the characteristics of photothermal/matrix metalloproteinase-2(MMP-2)dual-responsive,tumor targeting,and size-variability were designed for enhancing the antitumor efficacy and achieving"on-demand"drug release *** on the thermal sensitivity of gelatin,we designed a size-variable gelatin nanoparticle(GNP)to encapsulate indocyanine green(ICG)and doxorubicin(DOX).Under an 808 nm laser irradiation,GNP-DOX/ICG responded photothermally and swelled in size from 71.58?4.28 to 160.80?9.51 nm,which was beneficial for particle retention in the tumor sites and release of the loaded ***,GNP-DOX/ICG showed a size reduction of the particles to 33.24?4.11 nm and further improved drug release with the degradation of overexpressed MMP-2 in *** the subsequently performed in vitro experiments,it was confirmed that GNP-DOX/ICG could provide a therapeutic effect that was enhanced and ***,GNP-DOX/ICG could efficiently suppress the growth of 4 T1 tumor in *** conclusion,this study may provide a promising strategy in the rational design of drug delivery nanosystems based on gelatin for chemo-photothermal therapy to achieve synergistically enhanced therapeutic efficacy against breast cancer.

关键词： Breast cancer Gelatin Indocyanine green Doxorubicin Nanoparticle Size-variable Chemoephotothermal therapy MMP-2

Characterization ofα_(2)Precipitates in Ti–6Al and Ti–8Al Binary Alloys:A Comparative Investigation

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2021年第5期34卷 710-718页

作者： Sabry S.Youssef Xiaodong zheng Yingjie Ma Sensen Huang Min Qi Jianke Qiu Ruixue Zhang Peitao Hua Shijian zheng jiafeng Lei Rui Yang School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Institute of Metal Research Chinese Academy of SciencesShenyang110016China Innovation Group of Marine Engineering Materials and Corrosion Control Southern Marine Science and Engineering Guangdong LaboratoryZhuhai519080China School of Materials Science and Engineering Northeastern UniversityShenyang110819China Hunan Goldsky Titanium Industry Technology Co. LtdChangde415001China School of Materials Science and Engineering Research Institute for Energy Equipment MaterialsHebei University of TechnologyTianjin300130China

Transmission electron microscopy(TEM)and atom probe tomography(APT)techniques were used to investigate the nanoscale orderedα_(2)(Ti_(3)Al)precipitates in Ti–Al binary ***–6Al and Ti–8Al binary alloys were solution treated and aged to obtain Widmanstatten microstructure and promoteα_(2)*** TEM results displayed strong short-range ordering ofα_(2)precipitates in Ti–8Al alloy,while no evidence of the superlattice reflections ofα_(2)in Ti–6Al *** results acquired from APT showed theα_(2)clusters and atoms distribution at the interface between the matrix andα_(2)*** size and morphology ofα_(2)particles in Ti–8Al alloy,respectively,obtained by TEM and APT are closely ***,the APT results displayed tiny size clusters in Ti–6Al alloy,which supposed to give evidence of the initial ordering process ofα_(2)precipitates in the absence of correlative results from TEM.

关键词： Ti–Al binary alloys Ti_3Al precipitates Transmission electron microscopy Atom probe tomography

永磁同步电机长线变频驱动系统定频滑模预测电流控制

在线全文

学校读者我要写书评

暂无评论

电工技术学报 2023年第4期38卷 915-924页

作者：郑长明阳佳峰高昂公铮伍小杰中国矿业大学电气工程学院徐州221116 国网江苏省电力有限公司镇江供电分公司镇江212002

煤矿高效可靠生产运输的一种优选方案是采用井上变频-井下永磁同步电机长线驱动方式。长线缆会加剧电机过电压和绝缘老化,故需加装输出LC滤波器。LC滤波器增加了系统阶数,导致传统线性控制策略结构复杂且参数整定耗时。为此,该文提出一... 详细信息

煤矿高效可靠生产运输的一种优选方案是采用井上变频-井下永磁同步电机长线驱动方式。长线缆会加剧电机过电压和绝缘老化,故需加装输出LC滤波器。LC滤波器增加了系统阶数,导致传统线性控制策略结构复杂且参数整定耗时。为此,该文提出一种永磁同步电机长线变频驱动系统的固定开关频率滑模预测电流控制(FSF-SPCC)策略。首先,建立基于滑模切换函数的预测模型,并设计基于滑模面跟踪的价值函数。因滑模面固有地实现了多变量控制,故可有效抑制谐振。其次,为了提升系统稳态性能并方便LC滤波器的设计,进一步提出一种三矢量FSF-SPCC控制器,实现了固定开关频率。最后,通过实验验证了所提控制策略的可行性。

关键词：永磁同步电机长线驱动滑模预测控制固定开关频率

基于虚拟电阻有源阻尼的LC滤波型永磁同步电机系统预测电流控制

在线全文

学校读者我要写书评

暂无评论

电工技术学报 2023年第22期38卷 6059-6069页

作者：郑长明董萱萱肖子语阳佳峰公铮中国矿业大学电气工程学院徐州221116

LC滤波型永磁同步电机(LC-PMSM)驱动系统因具有固有谐振峰而易引起电流环谐振失稳问题,且LC滤波器增大了系统阶数,导致常规线性控制方法结构和参数整定复杂。为解决上述问题,该文提出一种基于虚拟电阻有源阻尼的无差拍预测电流控制策略... 详细信息

LC滤波型永磁同步电机(LC-PMSM)驱动系统因具有固有谐振峰而易引起电流环谐振失稳问题,且LC滤波器增大了系统阶数,导致常规线性控制方法结构和参数整定复杂。为解决上述问题,该文提出一种基于虚拟电阻有源阻尼的无差拍预测电流控制策略。考虑到逆变器侧电感电流可由控制器直接控制,首先,设计了一种结构简单的电感电流无差拍预测控制器,其能够实现对定子电流的间接矢量控制;其次,为了抑制系统固有谐振,进一步提出了一种基于滤波电容并联虚拟电阻的有源阻尼控制策略;最后,给出了系统的闭环稳定性分析及参数设计准则,并通过实验验证了所提控制方法的有效性。

关键词：永磁同步电机 LC滤波器预测控制虚拟电阻有源阻尼