检索结果-南通市图书馆

light-Controlled Chemical Reaction Pathways in Disulfide-Based Nonequilibrium Systems

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2024年第6期6卷 1571-1580页

作者： Yingshuai Zhao Peng Zhao Jingyi zhang Yuanfeng Zhao Bohan li Guoxiu Hao Yuanyuan An Wei Zhou Yan Lu lien-Yang Chou Yijun Zheng School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210

Pathway selection in a complex chemical reaction network(CRN)enables organisms to adapt,evolve,and even learn in response to changing *** by this,herein we report an artificial system,where light signal was used to manipulate the reaction pathways in a disulfide-based nonequilibrium *** changing the photon energy and irradiation window,the anion or new radical-mediated pathways were selectively triggered,resulting in a user-defined evolution *** photodissipative cycles were achieved by UV(365 nm)irradiation,increasing the total number of reactions from 3 to *** emerging pathway selection of the CRN is accurately predictable and controllable even in complex organo-hydrogel *** demonstrate up to five-state autonomous sol-gel transitions and the formation of fuel-driven dissipative organo-hydrogel through both chemical and light *** work represents a new approach to allowing CRNs to communicate with the environment that can be used in the development of materials with lifelike behaviors.

关键词： chemical reaction networks light regulation kinetic control pathway selection disulfide

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

极端天气对风电场局地风环境的影响

华中科技大学学报（自然科学版） 2024年第7期52卷 106-112页

作者：郜志腾张军李岳李晔上海交通大学船舶海洋与建筑工程学院上海201100 成都流体动力创新中心四川成都610072

以东南沿海某风电场24台兆瓦级风电机组为例,基于中尺度数值模式并结合风电场参数化模型,对台风天气下该风电场局地风速、风向、风功率密度、湍动能等特征量的时序演变特征和空间分布特性进行分析.结果表明:数值模拟结果与观测结果平均... 详细信息

以东南沿海某风电场24台兆瓦级风电机组为例,基于中尺度数值模式并结合风电场参数化模型,对台风天气下该风电场局地风速、风向、风功率密度、湍动能等特征量的时序演变特征和空间分布特性进行分析.结果表明:数值模拟结果与观测结果平均误差在1 m/s以内;未受台风影响时风电场在轮毂高度处速度亏损最大,垂向上尾流影响范围在3倍轮毂高度左右;受台风影响时,风电场尾流受台风强迫作用而呈现尾流偏转效应,尾流最大偏转角可达33°;风电场尾流会增加附近区域的湍动能水平,在水平方向上影响区域持续至下游4~8倍风场直径,在垂向上影响范围可达3.5倍轮毂高度处.风电场下游较远处湍动能分布受下垫面、风电场尾流和极端风况的耦合调制作用,进而呈现典型的大尺度旋涡绕流结构.

关键词：极端天气大气环境风电场风资源中尺度模式

在线全文

学校读者我要写书评

暂无评论

非饱和粉土的抗拉强度研究及其预测

岩石力学与工程学报 2024年第8期43卷 2069-2078页

作者：何伟高游李万双李泽张夏阳宁波大学土木工程与地理环境学院浙江宁波支315211 中国二十冶集团有限公司上海200000

坡体失稳破坏和路基填土开裂等工程地质问题均与土体的抗拉强度密切相关。利用巴西劈裂试验对不同初始含水率的非饱和土压实样和脱湿样进行抗拉强度试验研究,旨在探究广含水率范围内非饱和土压实样和脱湿样抗拉强度的演化规律。结果表明... 详细信息

坡体失稳破坏和路基填土开裂等工程地质问题均与土体的抗拉强度密切相关。利用巴西劈裂试验对不同初始含水率的非饱和土压实样和脱湿样进行抗拉强度试验研究,旨在探究广含水率范围内非饱和土压实样和脱湿样抗拉强度的演化规律。结果表明:随含水率的降低,压实样的抗拉强度先增大再减小,存在1个临界含水率,在临界含水率处其抗拉强度达到最大值。与此相反,脱湿样的抗拉强度会不断增大并趋于稳定。这是由于压实样的抗拉强度主要与弯曲液面处产生的毛细吸应力相关,而脱湿样的抗拉强度主要与毛细吸应力和胶结力等相关。其次,利用电镜扫描试验所测得压实样与脱湿样的微观孔隙结构图对此进行分析与讨论。最后,基于考虑毛细和吸附作用的非饱和土有效应力公式,建立非饱和土抗拉强度预测模型,并利用不同类型土的实测数据验证模型的有效性。

关键词：土力学非饱和土抗拉强度微观孔隙结构巴西劈裂试验

中国区域ERA5-ZTD/PWV精度评估与台风事件响应研究

在线全文

学校读者我要写书评

暂无评论

灾害学 2024年第1期39卷 23-28页

作者：连达军何琦敏李黎富尔江张克非苏州科技大学地理科学与测绘工程学院江苏苏州215009 苏州科技大学北斗导航与环境感知研究中心江苏苏州215009 北星空间信息技术研究院(南京)有限公司江苏南京211800 中国矿业大学环境与测绘学院江苏徐州221116

再分析数据能够提供多种历史气象数据同化产品,为了评估欧洲中期天气预报中心的最新一代ERA5再分析数据集估计的天顶对流层延迟(Zenith Tropospheric Delay,ZTD)和大气可降水量(Precipitable Water Vapor,PWV)产品在中国区域的精度,利用... 详细信息

再分析数据能够提供多种历史气象数据同化产品,为了评估欧洲中期天气预报中心的最新一代ERA5再分析数据集估计的天顶对流层延迟(Zenith Tropospheric Delay,ZTD)和大气可降水量(Precipitable Water Vapor,PWV)产品在中国区域的精度,利用2017—2019年中国区域内14个全球导航卫星系统地面监测站和89个探空站反演的ZTD和PWV数据分别对ERA5-ZTD和ERA5-PWV精度进行了评估。结果表明,除青藏地区的站点外,ERA5-ZTD的精度分布较为均匀,平均Bias、RMSE和STD分别为-6.3 mm、19.3 mm和17.5 mm;ERA5-PWV的精度分布呈现西部内陆高和东南沿海低的趋势,平均Bias、RMSE和STD分别为0.3 mm,2.9 mm和2.7 mm。此外,在研究2019年“利奇马”台风期间ZTD和PWV的时空分布中,提出了使用水汽到达时间差的方法定量估计台风的水汽移动速度。得到台风期间ZTD和PWV具有相同的空间分布规律,且移动方向与台风的移动路径方向是一致的,估计的水汽平均移动速度为12.4 km/h,与台风的平均移动速度16.1 km/h非常接近。因此,ERA5-ZTD/PWV在中国区域内具有较高的精度,ZTD和PWV可作为重要气象因子为台风的预警预报研究提供重要参考。

关键词： ERA5 全球导航卫星系统对流层延迟水汽台风

Dynamic Control of Multiple Optical Patterns of Cholesteric liquid Crystal Microdroplets by light-Driven Molecular Motors

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2024年第2期6卷 427-438页

作者： Jiaqin li Shuting Xie Jiahui Meng Yuying liu Qi Zhan Yang zhang lingling Shui Guofu Zhou Ben L.Feringa Jiawen Chen SCNU-UG International Joint Laboratory of Molecular Science and Displays National Center for International Research on Green OptoelectronicsSouth China Normal UniversityGuangzhou 510006 Joint Laboratory of Optofluidic Technology and Systems Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and DevicesSchool of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006 Stratingh Institute for Chemistry University of Groningen9747AG Groningen

The key to high-level encryption and anti-counterfeiting techniques is the storage of multiple levels of distinct information that can be individually and precisely addressed by certain *** continues to be a formidable challenge as the concealed images or codes must be read with fast response and high resolution without cross-talk to the first layer of ***,we report a non-fluorescencebased strategy to establish responsive encryption labels taking advantage of solely tuning multiple optical patterns of cholesteric liquid crystal(CLC)microdroplets doped with light-driven molecular *** photo-triggered unidirectional rotation of the motor induced not only changes in the helical twist power value but the opposite helical orientation of the superstructure in CLCs as well,resulting in changes in both the structural color and the selective reflection of circularly polar *** designed labels,which featured highly selective addressability of dual-level distinct information,good reversibility,and viewing angle-independence,were applied to build devices for daily practical use,demonstrating great potential in anti-counterfeiting technology and provide a versatile platform for enhanced data protection and encryption of authentic information.

关键词： molecular motor chirality amplification cholesteric liquid crystal anti-counterfeiting label data encryption

Perioperative outcomes of transvaginal specimen extraction laparoscopic total gastrectomy and conventional laparoscopicassisted total gastrectomy

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

World Journal of Gastrointestinal Surgery 2024年第6期16卷 1527-1536页

作者： Zhi-Cao zhang Wen-Sheng Wang Jiang-Hong Chen Yuan-Hang Ma Qi-Fa Luo Yun-Bo li Yang Yang Dan Ma Department of General Surgery Xinqiao Hospital of Army Medical UniversityChongqing 400037China

BACKGROUND Natural orifice specimen extraction surgery(NOSES)has emerged as a promising alternative compared to conventional laparoscopic-assisted total gastrectomy(LATG)for treating gastric cancer(GC).However,evidence regarding the efficacy and safety of NOSES for GC surgery is *** study aimed to compare the safety and feasibility,in addition to postoperative complications of NOSES and *** Dual circular staplers were used in Roux-en-Y digestive tract reconstruction for transvaginal specimen extraction LATG,and its outcomes were compared with LATG in a cohort of 51 GC patients with tumor size≤5 *** study was conducted from May 2018 to September 2020,and patients were categorized into the NOSES group(n=22)and LATG group(n=29).Perioperative parameters were compared and analyzed,including patient and tumor characteristics,postoperative outcomes,and anastomosis-related complications,postoperative hospital stay,the length of abdominal incision,difference in tumor type,postoperative complications,and postoperative *** Postoperative exhaust time,operation duration,mean postoperative hospital stay,length of abdominal incision,number of specific staplers used,and Brief Illness Perception Questionnaire score were significant in both groups(Phe NOSES group,the postoperative time to first flatus,mean postoperative hospital stay,and length of abdominal incision were significantly shorter than those in the LATG *** in the NOSES group had faster postoperative recovery,and achieved abdominal minimally invasive incision that met aesthetic *** were no significant differences in gender,age,tumor type,postoperative complications,and postoperative survival between the two *** The application of dual circular staplers in Roux-en-Y digestive tract reconstruction combined with NOSES gastrectomy is safe and *** approach offers better short-term outcomes compared to LATG,while long-term survival

关键词： Gastric cancer Circular stapler Natural orifice specimen extraction surgery Laparoscopic-assisted total gastrectomy

非修饰靶点发现细胞热位移分析技术的变革与应用进展

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

药学学报 2024年第1期59卷 25-34页

作者：刘广苑李亚慧张炜孔德志河北医科大学中西医结合研究所河北石家庄050017

了解药物的蛋白靶点研究方法对于新药研发、药物的临床应用、药物的作用机制和疾病的致病机制都具有十分重要的意义。细胞热位移分析(cellular thermal shift assay,CETSA)作为无修饰分析的靶点研究方法自开发以来就被广泛应用。经过不... 详细信息

了解药物的蛋白靶点研究方法对于新药研发、药物的临床应用、药物的作用机制和疾病的致病机制都具有十分重要的意义。细胞热位移分析(cellular thermal shift assay,CETSA)作为无修饰分析的靶点研究方法自开发以来就被广泛应用。经过不断地演化,现在已经出现了多种基于CETSA的技术结合,如基于质谱的细胞热位移分析(mass spectrometry-based cellular thermal shift assay,MS-CETSA)、结合等温剂量反应实验的细胞热位移分析(isothermal dose response-cellular thermal shift assay,ITDR-CETSA)、结合均相光激化学发光免疫分析的细胞热位移分析(amplified luminescent primity homogeneous assay-cellular thermal shift assay,Alpha-CETSA)等。这些技术融合了各自的优势,进一步扩展了CETSA的应用范围,适用于从药物筛选到监测药物在患者体内的靶点结合和脱靶毒性研究的整个药物开发链。本文结合作者的研究经验,综述了近年来CETSA和相关结合技术的原理及其在靶点发现上的应用、数据处理分析的进展,旨在为CETSA的进一步应用提供参考和借鉴。

关键词：细胞热位移分析热蛋白质组分析靶点发现技术结合

All‑Covalent Organic Framework Nanofilms Assembled lithium‑Ion Capacitor to Solve the Imbalanced Charge Storage Kinetics

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第6期16卷 246-260页

作者： Xiaoyang Xu Jia zhang Zihao zhang Guandan Lu Wei Cao Ning Wang Yunmeng Xia Qingliang Feng Shanlin Qiao College of Chemistry and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018People’s Republic of China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China hebei Engineering Research Center of Organic Solid Photoelectric Materials for Electronic Information Shijiazhuang 050018People’s Republic of China

Free-standing covalent organic framework(COFs)nanofilms exhibit a remarkable ability to rapidly intercalate/de-intercalate li^(+) in lithium-ion batteries,while simultaneously exposing affluent active sites in *** development of these nanofilms offers a promising solution to address the persistent challenge of imbalanced charge storage kinetics between battery-type anode and capacitor-type cathode in lithium-ion capacitors(liCs).herein,for the first time,custom-made COFBTMB-TP and COFTAPB-BPY nanofilms are synthesized as the anode and cathode,respectively,for an all-COF nanofilm-structured *** COFBTMB-TP nanofilm with strong electronegative–CF3 groups enables tuning the partial electron cloud density for li^(+) migration to ensure the rapid anode kinetic *** thickness-regulated cathodic COFTAPB-BPY nanofilm can fit the anodic COF nanofilm in the *** to the aligned 1D channel,2D aromatic skeleton and accessible active sites of COF nanofilms,the whole COFTAPB-BPY//COFBTMB-TP liC demonstrates a high energy density of 318 mWh cm^(−3) at a high-power density of 6 W cm^(−3),excellent rate capability,good cycle stability with the capacity retention rate of 77%after *** COFTAPB-BPY//COFBTMB-TP liC represents a new benchmark for currently reported film-type liCs and even film-type *** being comprehensively explored via ex situ XPS,7li solid-state NMR analyses,and DFT calculation,it is found that the COFBTMB-TP nanofilm facilitates the reversible conversion of semi-ionic to ionic C–F bonds during lithium ***-TP exhibits a strong interaction with li^(+) due to the C–F,C=O,and C–N bonds,facilitating li^(+) desolation and absorption from the *** work addresses the challenge of imbalanced charge storage kinetics and capacity between the anode and cathode and also pave the way for future miniaturized and wearable liC devices.

关键词： Covalent organic frameworks lithium-ion capacitor Charge storage kinetic

TC4合金表面Zr-Y改性渗硅涂层的组织结构及高温摩擦磨损性能

在线全文

学校读者我要写书评

暂无评论

材料工程 2024年第6期52卷 193-200页

作者：李轩吕威何瑜张晓燕贾丽娜来升袁泉四川轻化工大学机械工程学院四川自贡643000 西安长峰机电研究所西安710065 北京航空航天大学材料科学与工程学院北京100191

采用固体粉末扩散渗方法在TC4合金表面制备了Zr-Y改性的渗硅涂层,研究了渗层的组织结构、高温摩擦磨损性能及磨损机制。结果表明:Zr-Y改性渗硅涂层具有多层梯度结构,外层由TiSi_(2)和少量ZrSi_(2)组成,较薄的中间层为TiSi相,内层为Ti_(5... 详细信息

采用固体粉末扩散渗方法在TC4合金表面制备了Zr-Y改性的渗硅涂层,研究了渗层的组织结构、高温摩擦磨损性能及磨损机制。结果表明:Zr-Y改性渗硅涂层具有多层梯度结构,外层由TiSi_(2)和少量ZrSi_(2)组成,较薄的中间层为TiSi相,内层为Ti_(5)Si_(4)和Ti_(5)Si_(3)的混合物。涂层的显微硬度明显高于TC4合金基体,且由表及内呈梯度降低趋势。高温摩擦磨损实验(600℃)结果表明,Zr-Y改性渗硅涂层具有优良的摩擦磨损防护性能。与GCr15对磨时的磨损率约为3.59×10^(-5)mm^(3)/(N·m),是相同条件下TC4合金磨损率的36.6%,磨损机制主要为GCr15在涂层表面的擦涂和氧化磨损。与Al2O3球对磨时的磨损率为9.75×10^(-5)mm^(3)/(N·m),是相同条件下TC4合金磨损率的18.9%,磨损机制为疲劳磨损、氧化磨损和黏着磨损。

关键词： TC4合金 Zr-Y改性扩散渗硅化物涂层高温磨损磨损机制

维普期刊数据库博看期刊