检索结果-南通市图书馆

Non-equilibrium Thermodynamic Analysis of The Transport Properties of Formed-in-Place Zirconium (Ⅳ) Hydrous Oxide-Polyacylate Membranes in aqueous NaNO_3 solution

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第9期9卷 867-868页

作者： jia zhen yang (Department of Chemistry, Liaoning University, Shenyang 110036) Department of Chemistry Liaoning University Shenyang 110036 China

Nanofiltration of aqueous NaNO3 solution with a dynamically formed Zr(IV) hydrousoxide-PAA membrane is presented. The practical transpoft coefficients Lp, σ, ω were obtainedusing relationships of the non-equilibrium... 详细信息

关键词： non-equilibrium thermodynamics dynamically formed membrane electrolytenanofiltration

Studies on the Absorption Spectra of Aqueous L-Tyrosine and Its Application

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1996年第12期7卷 1117-1120页

作者： jia zhen yang Zi Fu ZHANG Jun LIU(Department of Chemistry, Liaoning University, Shenyang 110036) LIAONING UNIV DEPT CHEMSHENYANG 110036PEOPLES R CHINA

The absorption spectra of agueous L-tyrosine at various total ionic strengths were measured by UV-240 spectrophotometer at 298.2+/-0.2K and the standard third dissociation constant of L-tyrosine was determined from th... 详细信息

关键词： Studies on the Absorption Spectra of Aqueous L-Tyrosine and Its Application

Early prophylactic anticoagulation with heparin alleviates mortality in critically ill patients with sepsis:a retrospective analysis from the MIMIC-IV database

在线全文

学校读者我要写书评

暂无评论

Burns & Trauma 2022年第1期10卷 283-293页

作者： Zhi-ye Zou jia-jia Huang Ying-yi Luan zhen-jia yang Zhi-peng Zhou Jing-jing Zhang Yong-ming Yao Ming Wu Department of Critical Care Medicine and Hospital Infection Prevention and Control Shenzhen Second People’s Hospital&First Affiliated Hospital of Shenzhen UniversityShenzhen 518035China Postgraduate Education Shantou University Medical CollegeShantou 515041China Department of Central Laboratory Beijing Obstetrics and Gynecology HospitalCapital Medical UniversityBeijing 100026China Trauma Research Center Medical Innovation Research Department and Fourth Medical Center of the Chinese PLA General HospitalBeijing 100048China Guangxi University of Chinese Medicine Nanning 530200China

Background:Minimal data exist on anticoagulation use and timing and the dose of heparin in patients with sepsis,and whether heparin use improves sepsis survival remains largely *** study was performed to assess whether heparin administration would provide a survival advantage in critically ill patients with ***:A retrospective cohort study of patients with sepsis in the Medical Information Mart for Intensive Care(MIMIC)-IV database was *** proportional hazards model and propensity score matching(PSM)were used to evaluate the outcomes of prophylactic anticoagulation with heparin administered by subcutaneous injection within 48 h of intensive care unit(ICU)*** primary outcome was in-hospital *** outcomes included 60-day mortality,length of ICU stay,length of hospital stay and incidence of acute kidney injury(AKI)on day *** analysis were used for unmeasured ***:A total of 6646 adult septic patients were included and divided into an early prophylactic heparin group(n=3211)and a nonheparin group(n=3435).In-hospital mortality in the heparin therapy group was significantly lower than that in the nonheparin group(prematched 14.7 vs 20.0%,hazard ratio(HR)0.77,95%confidence interval(CI)[0.68-0.87],p<0.001,and postmatched 14.9 vs 18.3%,HR 0.78,95%CI[0.68-0.89],p<0.001).Secondary endpoints,including 60-day mortality and length of ICU stay,differed between the heparin and nonheparin groups(p<0.01).Early prophylactic heparin administration was associated with in-hospital mortality among septic patients in different adjusted covariates(HR 0.71-0.78,p<0.001),and only administration of five doses of heparin was associated with decreased in-hospital mortality after PSM(HR 0.70,95%CI 0.56-0.87,p<0.001).Subgroup analysis showed that heparin use was significantly associated with reduced in-hospital mortality in patients with sepsis-induced coagulopathy,septic shock,sequential organ failure assessment score≥10,A

关键词： Early prophylactic anticoagulation Heparin Mortality Sepsis Critically ill patients

Is the Gum Nebula an important interstellar scattering disk of background pulsars?

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

Science China(Physics,Mechanics & Astronomy) 2025年第3期68卷 175-186页

作者： Rui Wang zhen Yan Zhiqiang Shen Ke jia Lee Yajun Wu Rongbing Zhao Zhipeng Huang Xiaowei Wang Jie Liu Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai200030China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing100049China Key Laboratory of Radio Astronomy and Technology Chinese Academy of SciencesBeijing100101China School of Physical Science and Technology ShanghaiTech UniversityShanghai201210China Department of Astronomy School of PhysicsPeking UniversityBeijing100871China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing100871China Department of Physics and Astronomy Hubei University of EducationWuhan430205China

The Gum Nebula is a faint supernova remnant extending about 40°across the southern sky,potentially affecting tens of background *** the view that the Gum Nebula acts as a potential scattering screen for background pulsars has been recurrently mentioned over the past five decades,it has not been directly *** chose the strong background pulsar PSR B0740-28 as a probe and monitored its diffractive interstellar scintillation(DISS)at 2.25&8.60 GHz simultaneously for about two years using the Shanghai Tian Ma Radio Telescope(TMRT).DISS was detected at both frequencies and quantified by two-dimensional autocorrelation *** calculated their scattering spectral indexαand found that 9/21 of the observations followed the theoretical predictions,while 4/21 of them clearly showedα<*** finding provides strong support for anomalous scattering along the pulsar line of sight,due to the large frequency lever arm and the simultaneous features of our dual-frequency *** comparison to the 2.25 GHz observations,scintillation arcs were observed in 10/21 of the secondary spectrum plots for 8.60 GHz ***,the highest frequency record for pulsar scintillation arc detection was updated to 8.60 *** fitting results were the most direct evidence for the view that the Gum Nebula acts as the scattering screen for background pulsars,because both the distance(245_(-72)^(+69)pc)and transverse speed(22.4_(-4.2)^(+4.1)km s^(-1))of the scintillation screen are comparable with related parameters of the Gum *** findings indicated that anisotropic scattering provides a superior explanation for the annual modulation of scintillation arcs than isotropic ***,the orientation of its long axis was also fitted.

关键词： pulsar interstellar scintillation Gum Nebula

胱氨酸基聚氨基酸纳米材料的可控合成及其生物医学应用

在线全文

学校读者我要写书评

暂无评论

高分子学报 2021年第8期52卷 960-977,I0003页

作者：杨佳臻邹昊洋丁建勋陈学思中国科学院长春应用化学研究所中国科学院生态环境高分子材料重点实验室长春130022 中国科学技术大学应用化学与工程学院合肥230026

聚氨基酸是一类以氨基酸及其衍生物为结构单元的高分子.鉴于其多样性的结构单元、优异的生物安全性、便利的修饰性、敏感的生物响应性和独特的二级结构等优异的性能,聚氨基酸在生物医学领域的应用具有显著的优势.胱氨酸是半胱氨酸通过... 详细信息

聚氨基酸是一类以氨基酸及其衍生物为结构单元的高分子.鉴于其多样性的结构单元、优异的生物安全性、便利的修饰性、敏感的生物响应性和独特的二级结构等优异的性能,聚氨基酸在生物医学领域的应用具有显著的优势.胱氨酸是半胱氨酸通过二硫键连接的二聚体,可以通过环化反应合成为双官能化的胱氨酸N-内羧酸酐(Cys^(2)NCA)单体.通过Cys^(2)NCA与单官能化的氨基酸N-内羧酸酐单体的开环聚合反应,可以可控合成一系列二硫键交联的具有多样性的化学结构、可调的粒径、优异的稳定性和敏感的生物响应性的聚氨基酸纳米材料,从而实现成像剂、生物活性分子等的可控递送.本文基于本课题组的研究工作综述了单组分、双组分和多组分胱氨酸基聚氨基酸纳米材料的研究进展,并展望了其在临床应用中的机遇与挑战以及新的生物医学应用领域.

关键词：胱氨酸聚氨基酸纳米材料可控合成功能化生物响应性

Pharmacological Mechanism of Chinese Medicine in Systemic Lupus Erythematosus:A Narrative Review

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2025年第2期31卷 157-169页

作者： ZHU Bo-yu LIU Zhi-chao ZHAO zhen-xi HUANG Hui-ping ZHANG Na XIA jia CHEN Wei-wei Department of Rheumatology Shanghai Municipal Hospital of Traditional Chinese MedicineShanghai University of Traditional Chinese MedicineShanghai(200071)China

Systemic lupus erythematosus(SLE)is a chronic autoimmune disorder affecting multiple systems,characterized by the development of harmful autoantibodies and immune complexes that lead to damage in organs and *** medicine(CM)plays a role in mitigating complications,enhancing treatment effectiveness,and reducing toxicity of concurrent medications,and ensuring a safe ***,CM mainly solves the disease comprehensively through multi-target and multi-channel regulation process,therefore,its treatment mechanism is often complicated,involving many molecular *** review introduces the research progress of pathogenesis of SLE from the aspects of genetics,epigenetics,innate immunity and acquired immunity,and then discusses the molecular mechanism and target of single Chinese herbal medicine and prescription that are commonly used and effective in clinic to treat SLE.

关键词： systemic lupus erythematosus Chinese medicine natural extracts treatment review

碳酸乙烯酯添加剂对BMImBF_4离子液体作为镁沉积—溶解电解液的改性研究

在线全文

学校读者我要写书评

暂无评论

化学学报 2008年第2期66卷 175-180页

作者：努丽燕娜杜国栋冯真真沈佳妮杨军上海交通大学化学化工学院上海200240

利用恒电流沉积-溶解、交流阻抗、XRD和SEM方法研究了在室温下EC(碳酸乙烯酯)添加剂对BMImBF_4离子液体作为镁沉积电解液的改善情况.在Mg(CF_3SO_3)_2浓度为0.3 mol·L^(-1)的BMImBF_4电解液中加入w=5%(质量分数)的EC后,沉积—溶解循环... 详细信息

利用恒电流沉积-溶解、交流阻抗、XRD和SEM方法研究了在室温下EC(碳酸乙烯酯)添加剂对BMImBF_4离子液体作为镁沉积电解液的改善情况.在Mg(CF_3SO_3)_2浓度为0.3 mol·L^(-1)的BMImBF_4电解液中加入w=5%(质量分数)的EC后,沉积—溶解循环过程更加稳定,并且循环次数明显增加,可以达到265次以上;交流阻抗结果显示,膜电阻和电荷转移电阻有所减少;从SEM图可以观察到,在沉积初期原本枝晶态的镁在加入EC后以颗粒状沉积.可能是EC添加剂在反应中形成的低聚物覆盖在镁的表面,抑制了枝晶的形成.

关键词：离子液体 BMImBF4 碳酸乙烯酯沉积-溶解镁电池

在线全文

学校读者我要写书评

暂无评论

天津市基坑抽排地下水量计量研究

岩土工程学报 2019年第A01期41卷 69-72页

作者：刁钰高泽东郑刚褚振西郭勇志贾镇阳天津大学土木工程系天津300072 天津大学滨海土木工程结构与安全教育部重点实验室天津300072

基于天津工程地质特点和水文地质特点,通过对天津市内多个基坑降水工程全方位、全过程的监测,运用不同测量方法,通过抽样与全面对比,研究了基坑疏干井与降压井抽水量变化关系,并结合已有工程实例,确定了不同类型基坑适用的降水水量计量... 详细信息

基于天津工程地质特点和水文地质特点,通过对天津市内多个基坑降水工程全方位、全过程的监测,运用不同测量方法,通过抽样与全面对比,研究了基坑疏干井与降压井抽水量变化关系,并结合已有工程实例,确定了不同类型基坑适用的降水水量计量方式,取得了基坑降水水量计算的经验公式。同时,根据不同计量方式下抽水过程中电量水量监测数据,总结了气泵降水和潜水泵降水抽水量与耗电量之间的关系。根据典型工程的测量结果并结合理论推导,提出3种基坑工程地下水抽排量估算方法,即井流量计算法、体积计算法和电量推测法。

关键词：地下水基坑抽水量耗电量

Phononic Resonant Relaxation in Magnetic Hysteresis of Single-Molecule Magnets

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2025年第2期42卷 109-124页

作者： Lei Gu jia Luo Qiancheng Luo Yuanqi Zhai Yan-zhen zheng Guoping Zhao College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610068China Frontier Institute of Science and Technology(FIST) Xi’an Jiaotong UniversityXi’an 710054China Center for Magnetism and Spintronics Sichuan Normal UniversityChengdu 610068China

Lanthanide-based single-molecule magnets exhibit broad magnetic hysteresis,which manifests as slow magnetic relaxation in strong magnetic ***,the origin of the nontrivial hysteresis behaviors remains ***,we propose two influential mechanisms:activation of optical-phonon-mediated direct transitions within the ground-state doublet and the resonant Raman *** discoveries,coupled with the g-factor anisotropy,account for the observed hysteresis behaviors in the regimes of fast magnetic *** findings complement the recognized mechanisms used to interpret the magnetic hysteresis of single-molecule magnets.

关键词： process. hysteresis magnets