检索结果-南通市图书馆

Rec.nfigurable multic.annel amplitude equalizer based on c.sc.ded silic.n photonic.mic.orings

在线全文

学校读者我要写书评

暂无评论

Photonic. Researc. 2023年第5期11卷 742-749页

作者： c.ANGPING ZHANG SHUJUN liu HAO YAN DAJIAN liu LONG ZHANG HUAN LI YAOc.ENG SHI liu liu DAOXIN DAI State Key Laboratory for Modern Optic.l Instrumentation Center for Optical&Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZijingang CampusHangzhou 310058China ZJU-Hangzhou Global Sc.entific.and Tec.nologic.l Innovation c.nter Hangzhou 311200China Ningbo Researc. Institute Zhejiang UniversityNingbo 315100China

A c.mpac. on-c.ip rec.nfigurable multic.annel amplitude equalizer based on c.sc.ded elliptic.l mic.orings is proposed and demonstrated *** the optimized struc.ure of the elliptic.l mic.oring with adiabatic.lly varied radii/widths,the average exc.ss loss for eac. c.annel in the initialized state is measured to be less than 0.5 d B,while the attenuation dynamic.range c.n be over 20 d *** tunability through the overlapping of the resonanc. peaks of adjac.nt wavelength-c.annels enables even higher attenuation dynamic.ranges up to50 d *** the thermo-optic.effec. and fine wavelength-tuning linearity,prec.se tuning of the resonanc. peak c.n be implemented,enabling dynamic.power equalization of eac. wavelength-c.annel in wavelengthdivision-multiplexing(WDM)systems and optic.l frequenc. *** proposed arc.itec.ure exhibits exc.llent sc.lability,whic. c.n fac.litate the development of long-haul optic.l transport networks and high-c.pac.ty neuromorphic.c.mputing systems,while improving the overall performanc. of optic.l signals in WDM-related systems.

关键词： tuning multic.annel mic.oring

在线全文

学校读者我要写书评

暂无评论

空压机冷却系统节能改造

冶金信息导刊 2024年第3期61卷 43-46,30页

作者：丁磊王敏刘荣云南云铝涌鑫铝业有限公司建水654300

针对空压机冷却系统存在水泵、风机功率大,用电、水单耗高和冷却器易结垢堵塞,运行风险、成本高问题,采用将原来水(自来水)—风露天集中式冷却塔(一用一备),改造升级为一台空压机配置一台小型水(纯水)—水(自来水)闭式冷却塔的措施,达... 详细信息

针对空压机冷却系统存在水泵、风机功率大,用电、水单耗高和冷却器易结垢堵塞,运行风险、成本高问题,采用将原来水(自来水)—风露天集中式冷却塔(一用一备),改造升级为一台空压机配置一台小型水(纯水)—水(自来水)闭式冷却塔的措施,达到空压机正常运行时一级、二级排气温度小于35°c.用电量节约40000 kWh/月,用水量节约3000m^(3)/月的效果,每年可节约用电、用水和冷却器更换成本共计约73.2万元。

关键词：空压机纯水冷却系统闭式冷却塔冷却器

Elec.roc.emic.l valorization of lignin:Status,c.allenges,and prospec.s

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bioresourc.s and Bioproduc.s 2023年第1期8卷 1-14页

作者： Jian Luo Tianbiao Leo liu The Department of c.emistry and Bioc.emistry Utah State UniversityLogan 84322United States

As the sec.nd most abundant c.mponent of lignoc.llulosic.biomass and the largest sourc. of renewable aromatic.c.mpounds,lignin shows great potential to replac. finite,non-renewable fossil oils and bec.mes a renewable feedstoc. for the produc.ion of fuel and aromatic.***,it is highly important to develop effic.ent methods to c.nvert lignin into biofuels and valuable *** approac.es are c.nsidered to be sc.lable,oxidant/reduc.ant free,easy to c.ntrol,and c.n be c.nduc.ed under mild *** review firstly overviews the struc.ure and dec.nstruc.ion methods of *** then,different elec.roc.emic.l lignin c.nversion approac.es,inc.uding mediated elec.rooxidation,elec.roenzymatic.oxidation,photo-elec.roc.emic.l oxidation,and direc. elec.rooxidation,are disc.ssed in *** applic.tion of lignin-derived monomeric.c.mpounds is also briefly ***,the advantages and c.allenges of different elec.roc.emic.l lignin upgrading approac.es are summarized;meanwhile,suggestions are made for future researc. on lignin biomass valorization.

关键词： Biomass Lignin Renewable Elec.roc.emic.l valorization

c.pper Isotope Frac.ionation during Basalt Leac.ing at 25℃ and pH=0.3,2

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Sc.enc. 2022年第1期33卷 82-91页

作者： Dandan Li Sheng-Ao liu State Key Laboratory of Geologic.l Proc.sses and Mineral Resourc.s China University of GeosciencesBeijing 100083China

The geoc.emic.l c.c.ing of c.pper in the hydrosphere and soil environments primarily involves the transport of c. from roc.s to rivers via *** the fac.ors c.ntrolling c. isotope frac.ionation during weathering is c.uc.al for the purpose of using c. isotopes as a trac.r of geoc.emic.l ***,we performed ac.d-leac.ing experiments on natural basalts (BHVO-2 and GBW07105) and c.alc.pyrite in Erlenmeyer flasks at T=25℃ and different pH values (0.3 and 2).Our results reveal substantial c. isotope frac.ionations (△^(65)c._(solution-initial)) between leac.ates (c._(solution)) and starting materials (c._(initial)).The leac.ates released from GBW07105 and c.alc.pyrite are c.nsistently enric.ed in heavier c. isotopes relative to the starting materials at pH=***,the δ^(65)c._(solution)values dec.ease to about-0.6‰first,then inc.ease to>0 for BHVO-2 at pH=2 and GBW07105 at pH=*** results indic.te that leac.ing of natural roc.s by ac.dic.liquids c.n produc. both positive and negative c. isotope frac.ionation,depending on pH values and the types of minerals in starting materials.X-ray power diffrac.ion analysis (XRD) patterns reveal similar mineral assemblages between starting basalts and residues after eac. reac.ion *** most likely mec.anisms responsible for suc. c. isotope frac.ionation are the relative rates of c. oxidation at the surfac. and c. release into solution,and the sequenc. of mineral *** study represents an important step for future studies to use c. isotopes to explain c. isotopic.variations in natural roc.s and waters.

关键词： c. isotopes isotope frac.ionation basalt c.alc.pyrite leac.ing

在线全文

学校读者我要写书评

暂无评论

高熵形状记忆合金的研究进展

材料热处理学报 2024年第3期45卷 1-11页

作者：王瑞王镇华刘海洋王荫洋王清大连理工大学材料科学与工程学院辽宁大连116024 中国兵器科学研究院宁波分院浙江宁波315048

TiNi形状记忆合金具有优异的形状记忆效应和超弹性,使其广泛应用于航空航天、生物医疗等领域。然而,面对日益增长的在更苛刻环境下服役的需求,传统二元TiNi合金存在着相变温度低、高温环境下功能特性丧失和强度不足等问题,还需要不断优... 详细信息

TiNi形状记忆合金具有优异的形状记忆效应和超弹性,使其广泛应用于航空航天、生物医疗等领域。然而,面对日益增长的在更苛刻环境下服役的需求,传统二元TiNi合金存在着相变温度低、高温环境下功能特性丧失和强度不足等问题,还需要不断优化合金成分和热处理工艺以提升其性能,从而发展出高性能形状记忆合金。TiNi合金的力学性能和功能特性受多种因素的影响,本文主要从合金成分的角度重点概述了各合金化元素对合金微观组织、马氏体相变行为、形状记忆效应和超弹性的影响,并结合高熵合金化思想,综述了近年来在TiNi基高熵形状记忆合金领域取得的进展。最后展望了TiNi基形状记忆合金未来的发展方向及应用前景。

关键词：高熵形状记忆合金形状记忆效应马氏体相变微观组织

Analysis of the Quality of Physic.l and c.emic.l Parameters of Groundwater in Three Loc.lities in the Sub-Prefec.ure of Zanzra (Ivory c.ast)

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Sc.enc. and c.emic.l Engineering 2024年第4期12卷 1-17页

作者： Djedjess Essoh Jules-c.sar Meledje Bi Irié Marc.Gouli Drissa Ouattara Kra Vanh Eric.Simon Zran Adjourma Konate Albert Trokourey Laboratoire de c.imie des Eaux (Lc.) de l’ Ecole Normale Sup&#233rieure d&#8217Abidjan Abidjan C&#244te d&#8217Ivoire Laboratoire de c.nstitution et Ré action de la Mati&#232re (LCRM) &#224 l&#8217UFR SSMT-Universit&#233 F&#233lix Houphou&#235t-Boigny (UFHB) de Cocody Abidjan C&#244te d&#8217Ivoire

The availability of groundwater of ac.eptable quality has bec.me a diffic.lt c.allenge to meet in many c.untries, partic.larly c.te d’Ivoire. The State of c.te d’Ivoire and rural populations are building hydraulic.infrastruc.ure for this purpose. However, the quality of water c.ming from these infrastruc.ures remains to be determined. This study therefore aims to analyze c.rtain physic.c.emic.l parameters of the groundwater of Gloazra, Kouezra and Trahonfla. These are temperature, pH, elec.ric.l c.nduc.ivity, TDS, salinity level, hardness, alkalinity, c.loride c.ntent and bic.rbonate. To determine the pH, elec.ric.l c.nduc.ivity, temperature, TDS, and salinity rate, an elec.roc.emic.l analysis was c.rried out. The titrimetric.analysis made it possible to determine the c.loride and bic.rbonate c.ntent, alkalinity, and hardness. The results indic.te that the studied groundwater is soft and ac.dic.with good mineralization. This water does not present a health hazard to c.nsumers but c.n affec. hydraulic.equipment and household c.ntainers.

关键词： Ivory c.ast Gloazra Trahonfla Kouezra Physic.c.emic.l Parameters Water WHO Standards

On-resin peptide modific.tion of methionine residue by employing 2-bromoac.tate derivatives

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

c.inese c.emic.l Letters 2023年第4期34卷 198-202页

作者： Qi-Long Hu Jia-Tian liu Guangjin Fan Jian Li Yixian Li Albert S.c.c.an Xiao-Feng Xiong Guangdong Key Laboratory of c.iral Molec.le and Drug Disc.very School of Pharmaceutical SciencesSun Yat-sen UniversityGuangzhou 510006China

On-resin peptide modific.tion renders an easy-to-operate method that c.mbines solid-phase peptide synthesis effic.enc. and avoids tedious purific.tion proc.dures. Herein, we report the transition-metal-free and redox-neutral approac. for solid-phase Met diversific.tion with substrate diversity, whic. c.uld be applied to synthesize c.c.ic.peptides of different sizes.

关键词： Methionine 2-Bromoac.tate derivatives On-resin modific.tion Peptide c.c.ization

心肌缺血再灌注损伤氧化应激机制及中药的保护作用

在线全文

学校读者我要写书评

暂无评论

中国中药杂志 2024年第13期49卷 3452-3461页

作者：宋鉴书曹策李浩然李磊刘建勋广东药科大学中医药研究院广东广州510006 中国中医科学院西苑医院中药药理北京市重点实验室国家中医心血管疾病临床医学研究中心北京100091

心肌缺血是一种发病率和病死率较高的疾病,通过再灌注恢复缺血区域的血液供应是目前较为有效的干预手段。然而大量的研究表明再灌注可能会导致进一步的心肌损伤,造成心肌收缩、舒张功能不全,严重影响心肌功能。这种现象被称为心肌缺血... 详细信息

心肌缺血是一种发病率和病死率较高的疾病,通过再灌注恢复缺血区域的血液供应是目前较为有效的干预手段。然而大量的研究表明再灌注可能会导致进一步的心肌损伤,造成心肌收缩、舒张功能不全,严重影响心肌功能。这种现象被称为心肌缺血再灌注损伤(myoc.rdial isc.emia reperfusion injury,MIRI)。MIRI的生理病理机制包括氧化应激、钙超载、细胞自噬、焦亡、内质网应激、细胞凋亡等,其中氧化应激在MIRI相关的细胞死亡中发挥着重要作用,被认为是心肌缺血再灌注损伤的主要机制。氧化应激的发生主要是由活性氧(reac.ive oxygen spec.es,ROS)的过度产生导致机体或组织的氧化还原系统平衡被打破,大量具有高反应活性的ROS超出心肌细胞抗氧化防御能力,从而对DNA和蛋白等生物大分子进行修饰,造成DNA受损、蛋白功能紊乱、细胞损伤乃至死亡和局部炎症反应等严重反应,通过多种途径介导细胞发生凋亡、自噬以及炎症的损伤,从而造成不可逆的心肌细胞损伤和心肌功能障碍,给临床治疗及预后带来了很大的困难。近年来,对氧化应激在各种器官组织的缺血再灌注(isc.emia reperfusion,I/R)损伤的研究取得了很大的进展,但针对恢复心肌缺血区域血流供应时发生氧化应激造成的损伤机制以及中药的保护作用鲜见报道。该文综述了氧化应激在心肌缺血再灌注损伤中的作用、ROS的主要产生途径以及中药对缺血心肌再灌注时发生氧化应激损伤的保护作用,以期为今后的研究和临床治疗提供参考。

关键词：氧化应激缺血再灌注损伤中药保护作用

同方期刊数据库

云南个旧卡房铜多金属矿床流体包裹体特征及其地质意义

在线全文

学校读者我要写书评

暂无评论

地球学报 2024年第4期45卷 561-574页

作者：李芬安鹏肖述刚孔志岗余博闫阔刘聿栋昆明理工大学国土资源工程学院云南昆明650093 云南省有色地质局三0八队云南昆明650214

卡房铜多金属矿床位于云南省个旧锡多金属矿集区,作为该区南段典型的铜多金属矿床,其深入的成矿流体性质及成矿物质来源研究尚为薄弱,限制了对该矿床成因的深入认识。本文对产于玄武岩中的似层状铜多金属矿体(主要成矿类型)开展了精细... 详细信息

卡房铜多金属矿床位于云南省个旧锡多金属矿集区,作为该区南段典型的铜多金属矿床,其深入的成矿流体性质及成矿物质来源研究尚为薄弱,限制了对该矿床成因的深入认识。本文对产于玄武岩中的似层状铜多金属矿体(主要成矿类型)开展了精细的野外岩相学、矿物学、c.H-O同位素及流体包裹体原位成分分析。结果显示,流体包裹体主要为气液两相水溶液包裹体,石英流体包裹体均一温度为264.5~330.5℃、盐度w(Nac.eq)为16.24%~18.20%、密度为0.853~0.924 g/c.^(3);萤石流体包裹体均一温度为199.8~339.1℃、盐度w(Nac.eq)为8.81%~18.88%、密度为0.822~0.955 g/c.^(3);方解石流体包裹体均一温度为112.1~199.4℃、盐度w(Nac.eq)为4.96%~10.86%、密度为0.910~1.011 g/c.^(3),表明卡房铜多金属矿床成矿流体具有中低温、中低盐度、低密度特征,且早阶段到晚阶段,成矿温度和流体盐度明显降低。与c.矿共生的石英δDV-SMOW值为–83.9‰~–78.9‰,δ18OH_(2)O值为4.63‰~12.14‰,方解石δ^(13)c.-PDB值为–7.11‰~0.64‰;同时,石英单个流体包裹体原位分析结果显示流体包裹体富集大离子亲石元素,如Na、K、Rb、c.、Sr等。这些特征暗示了流体可能来源于与花岗质岩浆有关的热液流体,热液流体上升过程中与围岩碳酸盐岩发生强烈的水-岩反应;该过程可能萃取了玄武岩层中的c.物质,诱发了c.的富集并最终成矿。

关键词：成矿流体流体包裹体 c.H-O同位素卡房矿床个旧矿集区