检索结果-南通市图书馆

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

教育错配对青年就业质量的影响:理论与实证

中国青年研究 2024年第9期 101-110,119页

作者：丁述磊王佳萍刘翠花首都经济贸易大学劳动经济学院西南财经大学经济与管理研究院首都经济贸易大学经济学院

本文利用中国家庭追踪调查(CFPS)数据,从理论与实证层面考察了教育错配对青年就业质量产生的影响、机制与异质性。研究发现:教育错配显著影响青年就业质量,过度教育和教育不足都会对青年就业质量有一定程度的影响,该结论通过了一系列稳... 详细信息

本文利用中国家庭追踪调查(CFPS)数据,从理论与实证层面考察了教育错配对青年就业质量产生的影响、机制与异质性。研究发现:教育错配显著影响青年就业质量,过度教育和教育不足都会对青年就业质量有一定程度的影响,该结论通过了一系列稳健性检验。机制分析表明,教育错配通过影响非正规就业、晋升机会与生活改善预期进而对青年就业质量产生重要影响。异质性分析表明,教育错配对青年就业质量的影响具有显著的性别、户籍、行业差异。因此,结论为数字经济时代为推动实现青年高质量就业,应加强教育阶段人才综合能力的多元培养,引导劳动力市场雇佣双方加强对人岗匹配的科学定位与全面评估。

关键词：教育错配青年劳动者就业质量

Erratum to:Influences of chemical reactions on polysulfide reduction reaction process on promotor surface in Li-S batteries

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第5期17卷 4643-4643页

Erratum to Nano Research,2024,17(4):2712-2718 https://***/10.1007/s12274-023-6129-5 The affiliation of the author,Wenhui Duan,is“2 Department of Physics,Tsinghua University,Beijing 100084,China”,instead of“1 Tsinghua-Foxconn Nanotechnology Research Center,Tsinghua University,Beijing 100084,China;2 Department of Physics,Tsinghua University,Beijing 100084,China”.And the affiliation of the author,Wenhui Duan,in the online version and the ESM file of this paper has been corrected.

关键词： sulfide corrected tor

Secrecy Rate Analysis for RIS-Aided Multi-User MISO System over Rician Fading Channel

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 Communications and Information Networks 2023年第1期8卷 48-56页

作者： jiaping wang Jun Zhang Jiacheng Lu Jue wang Qi Zhang Dongqian wang School of Communication and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210000China School of Information Science and Technology Nantong UniversityNantong 226019China.

The reconfigurable intelligent surface(RIS),which is composed of multiple passive reflective components,is now considered as an effective mean to improve security performance in wireless communications,as it can enhance the signal of legitimate users and suppress the power leakage at eavesdroppers by adjusting signal *** this paper,we maximize the downlink ergodic secrecy sum rate of a RIS-aided multi-user system over Rician fading channels,where we assume that only imperfect channel state information(CSI)is available at the base station(BS).Firstly,we obtain the deterministic approximate expression for the ergodic secrecy sum rate by resorting to the large-system approximation *** the problem is formulated to maximize the downlink ergodic secrecy sum rate by optimizing the regularization coefficient of regularized zero-forcing(RZF)precoding and the phase-shifting matrix of the *** using the particle swarm optimization(PSO)method,we propose an alternate optimization(AO)algorithm to solve this non-convex ***,the numerical simulations illustrate the accuracy of our large-system approximate expression as well as the effectiveness of the proposed algorithm.

关键词： RIS large-system approximation RZF precoding imperfect CSI ergodic secrecy sum rate

Applications of carbon nanotubes in high performance lithium ion batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of physics 2014年第3期9卷 351-369页

作者： Yang Wu jiaping wang Kaili Jiang Shoushan Fant Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center Tsinghua University Beijing 100084 China

The development of lit;triton ion batteries （LIBs） relies on the improvement in the performance of electrode materials with higher capacity, higher rate capability, and longer cycle lift;. In this review article, the recent advances in carbon nanotube （CNT） anodes, CNT-based composite electrodes, and CNT current collectors for high performance LIBs are concerned. CNT has received considerable attentions as a candidate material for the LIB applications. In addition to a possible choice for anode, CNT has been recognized as a solution in improving the performance of the state-of-the-art electrode materials. The CNT-based composite electrodes can be fabricated by mechanical or chem- ical approaches. Owing to the large aspect ratio and the high electrical conductivity, CNTs at very low loading can lead to an efficient conductive network. The excellent mechanical strength suggests the great potential in forming a structure scaffold to accommodate nano-sized electrode materials. Accordingly, the incorporation of CNTs will enhance the conductivity of the composite electrodes, mitigatc the agglomeration problem, decrease the dependence on inactive binders, and improve the clcctrochenfical properties of both anode and cathode materials remarkably. Freestanding CNT network can be used as lightweight current collectors to increase the overall energy density of LIBs. Finally, research perspectives for exploiting CNTs in high-performance LIBs are discussed.

关键词： lithium ion battery carbon nanotube composite conductive additive structural scaffold

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

乳酸——免疫调控多面手

免疫学杂志 2024年第2期40卷 206-210页

作者：王馨月李晓玲郭雯昕黄邦国王嘉萍王莉陈晓玲陆军军医大学基础医学院学员四大队十四队重庆400038 陆军军医大学基础医学院基础医学院免疫学教研室重庆400038

乳酸作为无氧或有氧糖酵解的主要产物,长期以来被认为只是该过程的代谢废物,而现在研究逐渐揭示,乳酸作为重要的信号分子,通过作用于免疫细胞中乳酸转运体、乳酸受体及胞内直接传感器等进行免疫调节,并在慢性炎症性疾病、感染、肿瘤等... 详细信息

乳酸作为无氧或有氧糖酵解的主要产物,长期以来被认为只是该过程的代谢废物,而现在研究逐渐揭示,乳酸作为重要的信号分子,通过作用于免疫细胞中乳酸转运体、乳酸受体及胞内直接传感器等进行免疫调节,并在慢性炎症性疾病、感染、肿瘤等疾病免疫中发挥了重要调控作用。本综述重点阐述近年来乳酸对于免疫调控作用的研究进展。

关键词：乳酸免疫调控慢性炎症感染肿瘤

胃息肉中医证型、病理类型与幽门螺杆菌感染的相关性研究

在线全文

学校读者我要写书评

暂无评论

山东中医杂志 2024年第9期43卷 970-976页

作者：盛好王新国马兴婷王家平新疆维吾尔自治区中医医院脾胃病科新疆乌鲁木齐830017 新疆医科大学第五附属医院中医科新疆乌鲁木齐830011

目的:探讨胃息肉的中医证型、病理类型与幽门螺杆菌(Hp)感染之间的相关性。方法:选取胃息肉患者500例为研究对象,收集患者的中医证候和病理诊断结果,对患者的中医证型、临床病理类型和Hp感染结果进行统计分析,研究中医证型、病理类型与H... 详细信息

目的:探讨胃息肉的中医证型、病理类型与幽门螺杆菌(Hp)感染之间的相关性。方法:选取胃息肉患者500例为研究对象,收集患者的中医证候和病理诊断结果,对患者的中医证型、临床病理类型和Hp感染结果进行统计分析,研究中医证型、病理类型与Hp感染之间的关系,探讨Hp感染与二者的相关性。结果:500例胃息肉患者男女比例为1∶1.6,高发病年龄为50~<60岁,Hp检出率为16.4%;病理类型以胃底腺息肉(43.6%)和炎性息肉(40.6%)最为多见,其次为增生性息肉(15.0%)、腺瘤样息肉(0.8%),Hp阳性率以炎性息肉最高(57.3%),且与其他病理类型阳性率比较差异有统计学意义(P<0.001);中医证型以脾胃虚弱证(47.6%)最为多见,其余依次为脾胃湿热证(24.6%)、肝胃不和证(13.4%)、胃络瘀阻证(7.4%)、痰湿中阻证(7.0%),Hp阳性率以脾胃虚弱证最高(51.2%),且与其余中医证型阳性率比较差异有统计学意义(P<0.001);不同病理类型的胃息肉患者中医证型均以脾胃虚弱证多见,其中增生性息肉、胃底腺息肉、炎性息肉脾胃虚弱证与其余中医证型比较,差异有统计学意义(P<0.001)。结论:胃底腺息肉和炎性息肉为胃息肉常见病理类型,脾胃虚弱证为最常见中医证型;胃息肉合并Hp感染以炎性息肉多见,多为脾胃虚弱证,提示脾胃虚弱为胃息肉主要病机,且与Hp感染密切相关。

关键词：胃息肉中医证型病理类型幽门螺杆菌脾胃虚弱炎性息肉胃底腺息肉

维普期刊数据库博看期刊

Validated,Rapid and Sensitive HPLC-MS/MS Method for Determination of 7,4'-Dihydroxylflavone in Rat Plasma and Its Application to Preliminary Pharmacokinetics

在线全文

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2019年第4期28卷 731-738页

作者： Shibo wang Panpan Li Yongzhi Li jiaping wang Yujuan Li School of Life Science Beijing Institute of TechnologyBeijing 100081China China Astronaut Research and Training Centre Beijing 100094China

A sensitive,specific and rapid high-performance liquid chromatography-electronic spray ionization-tandem mass spectrometric method was developed and validated for the determination of 7,4'-dihydroxylflavone(7,4'-DHF)in rat ***(internal standard,IS)was added in the collected plasma samples and subsided together by a simple one-step protein precipitation using acetonitrile-methanol(1:1,v/v).Chromatographic separation was performed on an Agilent Zorbax XDB C18 chromatography column and gradient elution with the mobile phase consisting of methanol and 0.1%formic acid was *** mass spectrometric detection was performed by negative ion electro-spray ionization in multiple selected reactions monitoring(MRM)mode,with the transitions of m/z 253.1→113.0 for 7,4'-DHF and m/z 268.9→158.8 for *** calibration curve has liner relationship over the concentration range of ***/mL(r=0.995.4).The intra-and inter-day precision(RSD%)was less than 10%,and the accuracy(RE%,relative error)ranged from-5.2%to 8.0%.The fully validated method was applied to the pharmacokinetics(PK)of 7,4'-dihydroxylflavone(7,4'-DHF)in rat plasma after oral administration(two doses:15 and ***/kg)and intravenous injection(***/kg).The result showed that Tmax and Cmax was 1.33±0.29.h and 0.12±***/mL(***/kg),and 1.17±0.29.h and 0.17±***/mL(***/kg),*** bioavailability was 0.078%(***/kg)and 0.070%(***/kg),respectively.

关键词： 7,4'-dihydroxylflavone HPLC-MS/MS pharmacokinetics bioavailability

单核细胞分布宽度、降钙素原、超敏C反应蛋白和白细胞介素6联合检测在脓毒症患者中的诊断价值

在线全文

学校读者我要写书评

暂无评论

系统医学 2024年第16期9卷 12-15页

作者：胡明赵雯黄廷廷王加平东海县人民医院检验科江苏东海222300

目的分析单核细胞分布宽度(monocyte distribution width,MDW)、降钙素原(procalcitonin,PCT)、超敏C反应蛋白(hypersensitive C-reactive protein,hs-CPR)和白细胞介素6(interleukin 6,IL-6)联合检测在脓毒症患者中的诊断价值。方法非随机选取2022年3月—2024年2月东海县人民医院收治的脓毒症患者52例,根据病情程度分轻度组26例、重度组26例,另选取同期26名健康体检者为对照组。比较3组受检者上述指标水平,并分析指标单一及联合检测的诊断价值。结果 3组PCT、IL-6、hs-CPR、MDW水平比较,差异有统计学意义(P均<0.05)。联合检测的灵敏度为94.23%(49/52)、准确度为94.87%(74/78),高于PCT、IL-6、hs-CPR、MDW单一检测的71.15%(37/52)、76.92%(60/78)、69.23%(36/52)、74.36%(58/78)、67.31%(35/52)、74.36%(58/78)、65.38%(34/52)、70.51%(55/78),差异有统计学意义(χ2=13.425、16.169,P均<0.05)。结论单核细胞分布宽度、降钙素原、超敏C反应蛋白和白细胞介素6联合检测在脓毒症患者中诊断效能较高。

关键词：脓毒症单核细胞分布宽度降钙素原超敏C反应蛋白白细胞介素6

Multi-shell nanocomposites based multienzyme mimetics for efficient intracellular antioxidation

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第8期14卷 2644-2653页

作者： Yongjian Ai Jinzhi You Jianyi Gao jiaping wang Hong-bin Sun Mingyu Ding Qionglin Liang MOE Key Laboratory ofBioorganic Phosphorus Chemistry&Chemical Biology Beijing Key Lab of Microanalytical Methods&InstrumentationCenter for Synthetic and Systems BiologyDepartment of ChemistryTsinghua UniversityBeijing 100084China China Astronaut Research and Training Center Beijing 100094China Department of Chemistry Northeastern UniversityShenyang 110819China

Oxidative stress is associated with many acute and chronic inflammatory *** of nanomaterial-based enzyme mimetics for reactive oxygen species(ROS)scavenging is challenging,but holds great promise for the treatment of inflammatory ***,we report the highly ordered manganese dioxide encapsulated selenium-melanin(Se@Me@MnO_(2))nanozyme with high efficiency for intracellular antioxidation and *** Se@Me@MnO_(2)nanozyme is sequentially fabricated through the radical polymerization and the in-situ *** vitro experimental results demonstrated that the Se@Me@MnO_(2) nanozyme exhibits multiple enzyme activities to scavenge ROS,including catalase(CAT),glutathione peroxidase(GPx)and superoxide dismutase(SOD).Mechanism researches illustrated that the Se core possesses GPx-like catalytic activity,the Me and the MnO_(2) possess both the SOD-like and the CAT-like ***’s more,due to the stable unpaired electrons existing in the nanozyme,the Se,Me and MnO_(2) provide synergistic and fast electron transfer effect to achieve the quickly scavenging of hydrogen peroxide,hydroxyl radical,and superoxide *** in vivo experimental results showed that this biocompatible nanozyme exhibits cytoprotective effects by resisting ROS-mediated damage,thereby alleviating the *** multienzyme mimetics is believed to be an excellent ROS scavenger and have a good potential in clinical therapy for ROS-related diseases.

关键词： oxidative stress reactive oxygen species multienzyme mimetics nanozymes intracellular antioxidation anti-inflammation