检索结果-南通市图书馆

Vector meson's spin alignments in high energy reactions

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 5-20页

作者： Jin-hui Chen Zuo-tang Liang Yu-Gang Ma Xin-Li Sheng qun Wang Key Laboratory of Nuclear Physics and Ion-beam Application (MoE) Institute of Modern PhysicsFudan University Institute of Frontier and Interdisciplinary Science Key Laboratory of Particle Physics and Particle Irradiation (MOE)Shandong University INFN-Firenze Department of Modern Physics University of Science and Technology of China School of Mechanics and Physics Anhui University of Science and Technology

The global spin alignment of vector mesons has been observed by the STAR collaboration at the Relativistic Heavy Ion Collider （RHIC） at Brookhaven National Laboratory （BNL）.It provides a unique opportunity to probe the correlation between the polarized quark and antiquark in the strongly coupled quark-gluon plasma （sQGP） produced in relativistic heavy ion collisions,opening a new window to explore the properties of s *** addition,spin alignments of vector mesons have also been observed in other high-energy particle collisions such as e+e-annihilations at high energies where hadron production is dominated by quark fragmentation *** results obtained are quite different from those obtained in heavy ion collisions where quark coalescence/combination mechanism dominates suggesting strong dependence on hadronization *** comprehensive studies in different hadronization processes are *** this article,we present a brief review of theoretical and experimental advances in the study of vector meson’s spin alignments in a variety of high-energy particle collisions,with emphasis on hadronization mechanisms.

关键词： vector meson spin alignment global polarization relativistic heavy ion collisions fragmentation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

青兰浸膏片处方及制备工艺研究

中国中医药信息杂志 2007年第12期14卷 52-53页

作者：谢阳谭辉群常熟市第二人民医院江苏常熟215500 采芝灵药业有限责任公司新疆库尔勒841000

目的优选青兰浸膏片处方及制粒压片工艺条件。方法采用L9(34)正交试验设计,以颗粒粒度、片芯硬度、脆碎度、崩解度为考察指标,对青兰浸膏片处方及制粒压片工艺条件进行优选。结果最佳工艺为青兰浸膏粉与淀粉、糊精的比例(kg)为25∶4∶1... 详细信息

目的优选青兰浸膏片处方及制粒压片工艺条件。方法采用L9(34)正交试验设计,以颗粒粒度、片芯硬度、脆碎度、崩解度为考察指标,对青兰浸膏片处方及制粒压片工艺条件进行优选。结果最佳工艺为青兰浸膏粉与淀粉、糊精的比例(kg)为25∶4∶1,用青兰浸膏混和粉0.25倍(kg)95%乙醇湿润搅拌8min制软材。结论用优选出的工艺参数制得的片剂综合评分最好,工艺科学合理。

关键词：青兰浸膏片芦丁正交设计

在线全文

学校读者我要写书评

暂无评论

全叶青兰提取物制备工艺优选

内蒙古中医药 2007年第9期26卷 40-41页

作者：谢阳谭辉群江苏省常熟市第二人民医院 215500

目的：优选全叶青兰提取物制备工艺。方法：采用L^9（3^4）正交试验设计，以浸膏收率和总黄酮含量为指标对制备工艺条件进行优选。结果：最佳工艺条件为药材的8～10倍量水提取2次，第1次2h，第2次1h，清膏在80℃以下烘干。结论：优选出... 详细信息

目的：优选全叶青兰提取物制备工艺。方法：采用L^9（3^4）正交试验设计，以浸膏收率和总黄酮含量为指标对制备工艺条件进行优选。结果：最佳工艺条件为药材的8～10倍量水提取2次，第1次2h，第2次1h，清膏在80℃以下烘干。结论：优选出的工艺科学合理。

关键词：全叶青兰青兰浸膏提取物制备工艺正交试验

脑血管侧支循环评估在脑血管介入术后再狭窄及缺血性脑血管事件中的应用

在线全文

学校读者我要写书评

暂无评论

海南医学 2018年第18期29卷 2534-2537页

作者：周桂桃龚昭惠谈惠群何伟郭庆李静静黄石市中心医院老年病科二病区湖北黄石435000

目的探讨脑血管侧支循环评估在脑血管介入术后再狭窄及缺血性脑血管事件中的临床应用价值。方法选择黄石市中心医院老年病科2014年9月至2017年5月收治的104例住院拟进行脑血管介入术的患者为研究对象。所有患者采用脑血管数字减影血管造... 详细信息

目的探讨脑血管侧支循环评估在脑血管介入术后再狭窄及缺血性脑血管事件中的临床应用价值。方法选择黄石市中心医院老年病科2014年9月至2017年5月收治的104例住院拟进行脑血管介入术的患者为研究对象。所有患者采用脑血管数字减影血管造影(DSA)进行脑血管检查,根据DSA检查结果,按照ASITN/SIR侧支血流分级系统对患者的侧支血流进行分级。术后6个月对患者再次进行DSA检查,根据检查结果,采用NASCET标准进行动脉狭窄程度的评估和再狭窄的评价。患者介入术后6个月,由专人负责随访,观察不良缺血性脑血管事件。结果本组104例患者中,不同侧支循环开放程度患者的体质量、体质量指数、性别比例和病史比较差异无统计学意义(P>0.05);无侧支循环组患者的ASITN/SIR侧支血流分级均为0级,一级侧支循环组患者的ASITN/SIR侧支血流分级分别为0级(36.17%)和1级(63.83%),二级侧支循环组患者中侧支血流分级分别为1级(36.84%)、2级(52.63%)和3级(10.53%),三级侧支循环组患者中侧支血流分级分别为2级(20.00%)和3级(80.00%),侧支循环分级越高,侧支血流分级也随着增高的趋势,差异有统计学意义(P<0.05)。术前,患者无狭窄和轻度狭窄的比例随着侧支循环开放程度的升高而降低,中度狭窄和重度狭窄则随着侧支循环开放程度的升高而升高,差异有统计学意义(P<0.05);随着侧支循环开放程度的升高,患者在脑血管介入术后发生再狭窄的概率降低,脑血管介入术后预后效果升高,差异有统计学意义(P<0.05)。结论脑血管侧支循环评价对改善脑血管介入术预后及治疗效果,制定相应的个体化治疗及预后方案具有重要的指导意义。

关键词：脑血管侧支循环评价脑血管介入术再狭窄缺血性脑血管事件

在线全文

学校读者我要写书评

暂无评论

骨科高值耗材登记表格的设计与应用

医学信息（医学与计算机应用） 2014年第12期18卷 35-35页

作者：谈惠群胡晓湖北省黄石市中心医院老年病区湖北黄石435000

目的为了不必要的浪费还有可能滋生腐败甚至导致医疗事故的发生,对骨科高值耗材登记表格的设计与应用,保障高值耗材的质量和安全使用,提高临床管理。方法笔者特设计一种骨科专用高值耗材使用登记表,表格由十五项组成,此表由科室专人负... 详细信息

目的为了不必要的浪费还有可能滋生腐败甚至导致医疗事故的发生,对骨科高值耗材登记表格的设计与应用,保障高值耗材的质量和安全使用,提高临床管理。方法笔者特设计一种骨科专用高值耗材使用登记表,表格由十五项组成,此表由科室专人负责填写,用于记录高值耗材的使用、记账及支出情况。结果减少了护士的统计核查的工作量,数据更准确、更清晰,同时又避免了耗材的积压和短缺现象的发生,收到良好效果。结论规范并严格执行高值耗材的管理流程,表格有关患者信息及耗材信息内容详细齐全,便于查找及核对。有利于及时登记手术患者费用,避免漏帐及跑帐。确保收支平衡而不是被动支出影响绩效。按月归档,便于科室或库房查找及统计,做到账目清晰明确。是科学、高效管理的有力保障。

关键词：骨科高值耗材登记表格设计应用

A Rapid and Convenient Synthesis of Acylals from Aldehydes and Acetic Anhydrides Catalyzed by SnCl_4/SiO_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

Chinese Chemical Letters 2001年第7期12卷 565-568页

作者： Yi qun LI Li hui CHENG Department of Chemistry Jinan UniversityGuangzhou 510632

A variety of aldehydes were converted into acylals in excellent yields with acetic anhydride in the presence of a catalytic amount of tin (IV) chloride supported on silica gel at room temperature.

关键词： Acylals tin (IV) chloride supported on silica gel

A Periodic Dividend Problem with Inconstant Barrier in Markovian Environment

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2015年第2期31卷 281-294页

作者： Fang JIN hui OU Xiang qun YANG College of Mathematics and Computer Sciences Hu'nan Normal University

Periodic dividend problem is a meaningful issue. Based on a compound binomial model with periodic dividend, we use a homogeneous, ergodic and irreducible discrete-time Markov chain to express the evolution from one period to the subsequent of the economic or the environmental and climatic conditions. We derive some properties about the model. A system of integral equations for the expectation and the r-th moment of discounted dividends until ruin time are obtained respectively. Moreover, by using of Contraction Mapping Principle, we solve the equation system and obtain the explicit expression.

关键词： Periodic dividend Markovian environment inconstant barrier ruin time discounted dividends contraction mapping principle

Electrochemical Behavior of Oxide Films of Stainless Steel in 40 kHz Sonicated Sulphate Electrolytes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2007年第2期20卷 148-152页

作者： ZHU Li-qun LI Min-wei WANG hui School of Materials Science and Engineering Beij＇ing University of Aeronautics and Astronautics Beijing 100083 China Shenyang Liming Aero-Engine Group Corporation Shenyang 110043 China

This paper describes effects of 40 kHz ultrasound on the oxide films of stainless steel in sulphate electrolytes so as to determine the transmitted power and to characterize mass transfer and peak current density on the electrode surface. Emphasis was mainly laid on electrochemical oxidations and peeling mechanism of oxide films in sonicated sulphate solutions （0.5 and 1.0 mol/L）. Polarization voltammetry, current response traces and SEM analysis were carded out in order to provide full information as to oxide films surface. Results shows that the rate of electrochemical oxidation, the shape of polarization curves and the surface micrographs in sonicated sulphate electrolytes are different from those obtained without introduction of ultrasound. It is concluded that ultrasound can change the electro-chemical behavior of oxide films by its cavitaion effects, which would produce transient mechanical impulsive force and enhance electrochemical reactions.

关键词： stainless steel oxide films electrolysis ultrasound cavitation

Investigation of Formation Process of the Chrome-free Passivation Film of Electrodeposited Zinc

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2007年第2期20卷 129-133页

作者： ZHU Li-qun YANG Fei HUANG hui-jie School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

The feasibility was investigated to substitute chrome-free passivation treatment of electrodeposited zinc in a titanium bath for chromate passivation treatment. The formation mechanism of the chrome-free passivation film was further analyzed. The surface mor- phologies and the elemental compositions of the treated samples with varied immersion times were observed by scanning electron mi- croscopy （SEM） and determined by energy dispersion spectrometry （EDS）, respectively. The electrode potential of the sample surface was recorded in the film formation process. The changes of the electrode potential are in accordance with that of SEM and EDS of the sample surface. The results of X-ray photoelectron spectroscopy （XPS） show the chrome-free passivation film composed ofZnO, SiO2, TiO2, Zn4Si207（OH）2, and SrF2. The anode zinc dissolution and the local pH value increase due to the cathode hydrogen ion reduction process result in the formation of the chrome-free passivation film. The macro-images of the chrome-free passivation films formed on electrodeposited zinc show that the color of the film changes from blue to iridescence with the increase of the immersion times.

关键词： electrodeposited zinc chrome-free pasivation film film formation process