期刊文献+
共找到22篇文章
< 1 2 >
每页显示 20 50 100
肥胖儿童non-HDL-C、remnant cholesterol与亚临床动脉粥样硬化的关系 被引量:4
1
作者 焦朝艳 刘戈力 +4 位作者 鲍鹏丽 魏莹 杨箐岩 郑荣秀 赵菁 《天津医科大学学报》 2014年第1期25-28,共4页
目的:了解non-HDL-C和remnant cholesterol与肥胖儿童亚临床动脉粥样硬化(AS)的关系。方法:根据甘油三酯(TG)水平将65例肥胖儿童(肥胖组)分为I组(TG≥2.3 mmol/L)32例,II组(TG<2.3 mmol/L)33例,与肥胖组儿童性别年龄相匹配的正常体... 目的:了解non-HDL-C和remnant cholesterol与肥胖儿童亚临床动脉粥样硬化(AS)的关系。方法:根据甘油三酯(TG)水平将65例肥胖儿童(肥胖组)分为I组(TG≥2.3 mmol/L)32例,II组(TG<2.3 mmol/L)33例,与肥胖组儿童性别年龄相匹配的正常体质量儿童30例为III组(对照组)。比较3组儿童血脂指标,对肥胖组各项血脂指标与血浆致动脉粥样硬化指数(AIP)进行相关性分析,肥胖患儿体质指数、血脂指标与颈动脉内径、内膜-中层厚度(c-IMT)、血流参数进行相关性分析。结果:I组、II组的TG、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、non-HDL-C、remnant cholesterol、AIP均较对照组升高,高密度脂蛋白胆固醇(HDL-C)较对照组降低,且I组的remnant cholesterol、AIP均较II组升高。肥胖组儿童AIP与TG、non-HDL-C、remnant cholesterol呈正相关,与HDL-C呈负相关。37例行颈动脉超声检查的肥胖儿童的c-IMT较正常儿童的增厚。结论:non-HDL-C、remnant cholesterol在肥胖儿童亚临床AS中有重要作用,在肥胖儿童血脂异常的治疗中应关注non-HDL-C、remnant cholesterol的变化。 展开更多
关键词 儿童肥胖 亚临床动脉粥样硬化 non—HDL—C REMNANT CHOLESTEROL 血浆致动脉粥样硬化指数 颈动脉内膜-中层厚度
下载PDF
Shenqi Fuzheng injection combined with GP chemotherapy in the treatment of advanced non-small cell lung cancer: a meta-analysis 被引量:13
2
作者 Qiang Zhang Yi-Huan Fan +2 位作者 Teng Zhang Xiao-Lan Qin Ji-Fang Song 《TMR Integrative Medicine》 2017年第2期68-78,共11页
Objective: To evaluate the clinical efficacy of Shenqi Fuzheng injection combined with gemcitabine plus cisplatin(GP) in the treatment of advanced non-small cell lung cancer (NSCLC). Methods: we performed a syst... Objective: To evaluate the clinical efficacy of Shenqi Fuzheng injection combined with gemcitabine plus cisplatin(GP) in the treatment of advanced non-small cell lung cancer (NSCLC). Methods: we performed a systematicsearch in the electronic databases such as Cochrane Library, Pubmed, Embase, Chinese Journal Full-text Database,Chinese Biomedical Literature Database, Chinese Science and Technology Periodical Full-text Database andWanfang Database up to 30 January 2017. Randomized controlled trials (RCT) of Shenqi Fuzheng Injectioncombined with GP chemotherapy in the treatment of advanced NSCLC were searched, and all the RCTs wereconducted on methodological quality assessment. Data extraction and data analysis were according to standards ofCochrane systematic review. Results: Eight trials were included including a total of 701 patients. Meta-analysisresults: Shenqi Fuzheng injection combined with GP chemotherapy could significantly improve the functionalstatus of patients with NSCLC (OR = 3.44, 95% CI [2.26, 5.25], P 〈 0.0001) and clinical treatment efficacy (OR =(OR = 0.31, 95%CI [0.20, 0.47], P 〈 0.0001. The rate of leukopenia (OR = .31, 95%CI [0.20,0.47], P 〈 0.0001),thrombocytopenia (OR = 0.58, 95%CI [0.37, 0.91], P = 0.020), hemoglobin decline ((OR = 0.31, 95%CI [0.16,0.59], P = 0.0004) and incidence of gastrointestinal reactions (OR = 0.58,P 〈 0.05) could be reduced. Conclusion:Shenqi Fuzheng injection combined with GP chemotherapy in the treatment of advanced NSCLC obtainedsignificantly clinical efficacy. The quality of the literature incorporated is low, the conclusion requires high-qualityresearch to further prove. 展开更多
关键词 Shenqi Fuzheng GP chemotherapy Advanced non - small cell lung cancer Meta analysis
下载PDF
Analysis of Numerical Results in High Temperature Congealment and Chemistry Non-equilibrium Flow Field
3
作者 Hong-tao Zheng Zhi-yong Tan +2 位作者 Hai-ou Sun Chun-liang Zhou Zhi-ming Li 《Journal of Marine Science and Application》 2002年第1期26-34,共9页
Using the air plasma ignition technique, physicochemical process of burning can be accelerated; concentration limit ofretrofires both can be extended; reliability of retrofires and stability of burning can be improved... Using the air plasma ignition technique, physicochemical process of burning can be accelerated; concentration limit ofretrofires both can be extended; reliability of retrofires and stability of burning can be improved. In this paper, using internalequivalent heat area in place of electric are that created Ohm heat, the flow fields of thermodynamic equilibrium chemistry con-gealment and chemistry non-equilibrium in the plasma generator were simulated. The influences of the inlet prerotation angleof air, the inlet total pressure of air and the airflow compression angle of spray nozzle on the temperature on the surface of elec- 展开更多
关键词 plasma GENERATOR CHEMISTRY non - EQUILIBRIUM IGNITION technique numerical calculation
下载PDF
Turbulent Flow Action of Pulp in Wet - Laid Non - Woven Processes
4
作者 程隆棣 黄秀宝 于修业 《Journal of China Textile University(English Edition)》 EI CAS 2000年第3期57-59,共3页
The paper deals with the fluid field of web forming in wet-laid non-woven production.The influence of the turbulent flow on blending fiber and occluded fluid produced in pulp flow has been discussed in theory and prac... The paper deals with the fluid field of web forming in wet-laid non-woven production.The influence of the turbulent flow on blending fiber and occluded fluid produced in pulp flow has been discussed in theory and practice.The suitable use of the imported velocity of pulp is very important in producing wet-laid products of good quality. 展开更多
关键词 WET - laid non - woven fiber PULP FLOW TURBULENT FLOW layer FLUID occluded FLUID .
下载PDF
CYFRA 21-1 as an early predictor of first line chemotherapy response in advanced non small cell lung cancer
5
作者 Kashif Iqbal 《The Chinese-German Journal of Clinical Oncology》 CAS 2007年第3期250-253,共4页
Objective: In an era of ever evolving, promising new therapies for advanced non small cell lung cancer (NSCLC), early predictors of response to therapy, are needed. We evaluated early variations in CYFRA 21-1 serum... Objective: In an era of ever evolving, promising new therapies for advanced non small cell lung cancer (NSCLC), early predictors of response to therapy, are needed. We evaluated early variations in CYFRA 21-1 serum levels of patients with advanced NSCLC receiving first line chemotherapy and correlated the results with objective tumor response. Methods: 29 consecutive, previously untreated, patients of advanced non small cell lung cancer, with measurable disease on CT scan were evaluated. All patients were treated with conventional systemic chemotherapy, although the choice of chemotherapy was left to the discretion of the treating physicians. Serum samples were obtained immediately before the start of 1st and 2nd cycles of chemotherapy. CYFRA 21-1 was measured with an electrochemiluminescense immunoassay on an automatic analyzer (Elecsys 2000; Roche Diagnostics). Response was evaluated using Response evaluation criteria in solid tumors (RECIST) criteria. Results: 10 patients had partial response, 9 patients had stable disease and 9 had progressive disease. None of the patients had complete response. 21/29 (72%) patients had an elevated baseline value of CYFRA 21-1.62% patients (18/29) had a decrease in CYFRA 21-1 after 1 cycle of chemotherapy. The average reduction in the 2nd reading was irrespective of whether baseline value was normal or not. The average reduction was statistically significant (P = 0.002; 95% CI, from 0.8369 to 3.49464; t test). 8 out of 10 (80%) patients with partial response had a reduction in their 2nd reading of. CYFRA (P = 0.019; 95% CI, from 0.81965 to 7.20035; t test) which was significant. We also observed that 6/9 (66%) patients whose disease remains stable also had a decrease in their subsequent reading (P = 0.0106; 95% CI, from -0.44942 to 3.82720; t test), though it was not significant statistically. Although 5 out of 9 (55%) patients, who had an increase in their CYFRA 21-1 level, had progressive disease, but it was not statistically significant (P = 0.537; 95% CI, from -1.20021 to 2.13354; ttest). 14 out of 19 (73%) who either had partial response or had stable disease, had a reduction in their 2nd value of CYFRA 21-1 and was significant statistically (P = 0.004; 95% CI, from 0.74792 to 3.50208; t test). We also observed that except for 1 patient, all patients who had a decrease of 42% or more in their subsequent CYFRA 21-1 level, were those who had either responded to chemotherapy or had stable disease (P = 0.001), which was statistically significant. Conclusion: We can conclude that monitoring of serum marker CYFRA 21-1, early dudng first-line chemotherapy may be a useful prognostic tool for evaluation of early tumor response in patients with advanced NSCLC. 展开更多
关键词 CYFRA 21-1 non small cell lung cancer CHEMOTHERAPY RESPONSE
下载PDF
MiR-16-5p plays an inhibitory role in human non-small cell lung cancer through Fermitin family member 2
6
作者 JUNQI GUO YUN YANG +6 位作者 WEI ZHAO ZHONGHAI YAN XIA YANG YUNFEI YAN RUIMIN HAO JINXIA HU FEI JIAO 《BIOCELL》 SCIE 2021年第3期627-638,共12页
Increasing evidence indicates that aberrant expressions of some microRNAs are associated with cancer progression.However,the roles and biological mechanisms of miRNA-16-5p in human non-small cell lung cancer(NSCLC)are... Increasing evidence indicates that aberrant expressions of some microRNAs are associated with cancer progression.However,the roles and biological mechanisms of miRNA-16-5p in human non-small cell lung cancer(NSCLC)are not to be well studied.Here,we validated that the expression of miR-16-5p was decreased significantly in NSCLC samples and cell lines.The correlation between the clinicopathological features of NSCLC and the miR-16-5p expression showed that the expression of miR-16-5p in non-small cell lung cancer was linked with the advanced TNM stage,positive lymph node metastasis,with short overall survival(OS).Also,a negative correlation between miR-16-5p and Fermitin family member 2(FERMT2)was observed,implying there may be a potential link about their regulation.The hypothesis was further confirmed by in-silico analysis and dual-luciferase reporter assay.Moreover,we demonstrated that the transfections of miR-16-5p mimics could alter some biological characteristics of NSCLC cells remarkably accomplished by the expression variance of FERMT2 in vitro and in vivo assays.Summarily,this study demonstrated that miR-16-5p,as a tumor suppression factor in NSCLC by targeting FERMT2,could serve as one promising biomarker in the prediction for NSCLC patients. 展开更多
关键词 miR-16-5p non–small-cell lung cancer(NSCLC) Fermitin family member 2(FERMT2) APOPTOSIS INVASION Overall survival(OS)
下载PDF
FAREY SEQUENCE OF NONLINEAR DIFFERENTIAL DYNAMIC SYSTEM IN TWO DIMENSIONS 被引量:1
7
作者 H. Q. Jin and S. N. Xu Shenyang Institute of Technology , Shenyang 110015 , China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期1234-1236,共3页
In this paper , through the discrim ination of Farey sequence in the forced Brusselator withweak coupling , it is proved that there is a topological translation fro m a nonlinear differen tial system ( limit cycle)... In this paper , through the discrim ination of Farey sequence in the forced Brusselator withweak coupling , it is proved that there is a topological translation fro m a nonlinear differen tial system ( limit cycle) to the circle m ap . 展开更多
关键词 non - linearity Farey sequence phase lock CHAOS
下载PDF
Ways to Overcome Anxiety in the English Listening Class in College (SUN JING-YU KE SU-FEN)
8
作者 孙晶玉 柯素芬 《呼伦贝尔学院学报》 1999年第1期74-77,87,共5页
In my ten-yeat experience of tenching English as major in college , I feel that students experience more difficulties in listening lessons than in other lessons. What, then, prevents students from achieving success in... In my ten-yeat experience of tenching English as major in college , I feel that students experience more difficulties in listening lessons than in other lessons. What, then, prevents students from achieving success in the listening class? I suggest that anxiety is one of the major factors, which interferes with students listening comprehension. And I would agree with writers such as Gardner and Horwitz et al. (1991)that anxiety may impede learner’s ability to perform successfully in all aspects of learning a foreign language. I feet it is particularly significant for listening. 展开更多
关键词 LISTENING anxiety creation of non - ANXIETY environment skills and process focus COUNSELLING corner exposure to authentic English
下载PDF
氨基酸与钠离子非共价键相互作用的电喷雾质谱研究 被引量:3
9
作者 吴胜明 杨松成 +6 位作者 王杰 王鸿丽 刘炳玉 李爱玲 何昆 魏开华 张学敏 《分析测试学报》 CAS CSCD 北大核心 2004年第z1期66-67,共2页
  实验研究中常常观察到钠离子与一些多肽或蛋白质有较强的非共价键结合能力,这种非共价键相互作用可能与生物的一些功能和活性有关.为了进一步了解这一结合作用,我们应用电喷雾质谱研究了常见的20种氨基酸与钠离子在溶液中的非共价...   实验研究中常常观察到钠离子与一些多肽或蛋白质有较强的非共价键结合能力,这种非共价键相互作用可能与生物的一些功能和活性有关.为了进一步了解这一结合作用,我们应用电喷雾质谱研究了常见的20种氨基酸与钠离子在溶液中的非共价键相互作用.实验研究中发现脯氨酸和苯丙胺酸与钠离子有较强的非共价键结合能力.…… 展开更多
关键词 Sodium ion Amino acids non - covalent interaction ESI - MS
下载PDF
对禅宗美学本体论的反思 被引量:5
10
作者 周全田 《郑州大学学报(哲学社会科学版)》 CSSCI 北大核心 2005年第5期47-51,共5页
“心性论”是一种柏拉图式思维的产物,是建立在西方传统的逻辑思维(形式逻辑、辩证逻辑)基础上的本体论,因此“心性论”不可避免地染有西方传统思维的弊病;“空观”是建立在“非逻辑思维”“模糊逻辑”“悟性思维”“不二思维”基础上... “心性论”是一种柏拉图式思维的产物,是建立在西方传统的逻辑思维(形式逻辑、辩证逻辑)基础上的本体论,因此“心性论”不可避免地染有西方传统思维的弊病;“空观”是建立在“非逻辑思维”“模糊逻辑”“悟性思维”“不二思维”基础上的本体论,加之“空”为“非存在”,因此它应是一种“非本体的本体”,“空观”是一种“非本体的本体”论,相应地,禅宗美学的本体论也应是“空观”的本体论。 展开更多
关键词 心性论 空观 非本体的本体 模糊逻辑
下载PDF
东西哲学有无之辩比较研究应有新的维度 被引量:1
11
作者 高新民 江雨 《常州大学学报(社会科学版)》 2013年第5期10-16,共7页
无论在西方还是东方哲学里,有无之辩或非存在问题都是形而上学的一个主要问题。从比较哲学的角度看,目前学界有这样几种共识,一是认为西方哲学关注"有"本身,东方哲学关注"无"。二是中国哲学对"无"的认识... 无论在西方还是东方哲学里,有无之辩或非存在问题都是形而上学的一个主要问题。从比较哲学的角度看,目前学界有这样几种共识,一是认为西方哲学关注"有"本身,东方哲学关注"无"。二是中国哲学对"无"的认识尽管历史悠久成果丰硕,但并没有研究纯粹本体论意义上的"无",只是在做价值论和人生哲学的探讨。三是对中西有无之辩的比较研究持两种对立的态度,即"大同"观,强调其可公度性,"大异"观,强调两者有水火不容的差异性,不能做比较研究。而然,通过梳理西方哲学史发现,有无之辩问题贯穿西哲史始终,西方哲学关注"有"本身,但并未忽略对"无"的研究,二者共同向前发展。而通过整理中国哲学原典,不难看出中国古代哲人智者不仅从价值哲学和生存哲学的角度对作为境界之无和功夫之无的非存在作了独到的探究,而且对本体之无、认识论之无也不偏废,从而使我国的非存在研究保持着既全面又深入的特色。针对学界泾渭分明的的大异大同问题,做出了更为详尽的考释和补充,不臧否某一家,承认其有差异之处,但趋于大同。 展开更多
关键词 比较研究 有无之辩 本体之无 大异大同
下载PDF
论数学摆脱本体论的过程 被引量:3
12
作者 李春泰 《嘉应大学学报》 2001年第2期14-20,共7页
数学最初以本体为研究对象 ,而到了 1 9世纪末数学的对象变成了关系。本文通过第五公设导致非—欧几何以及相容性问题的解决 ,指出这一演变过程和可能世界的形态。
关键词 罗卜切夫斯基几何学 本体论 第五公设 非欧几何学 黎曼几何学 模型 相容性问题 数学
下载PDF
试论王弼贵无贱有的本体思维
13
作者 裴传永 冯淑静 《玉溪师范学院学报》 2006年第8期1-5,共5页
王弼的哲学思想十分丰富,本体论思想毫无疑问是其哲学思想的核心。王弼是以无为本的贵无论的系统阐发者,正是有赖于他的理性思考和严密论证,“无”的本体地位才得以确立。王弼确立了“无”的本体地位以后,对“有”与“无”的关系也作了... 王弼的哲学思想十分丰富,本体论思想毫无疑问是其哲学思想的核心。王弼是以无为本的贵无论的系统阐发者,正是有赖于他的理性思考和严密论证,“无”的本体地位才得以确立。王弼确立了“无”的本体地位以后,对“有”与“无”的关系也作了详尽的辨析。在他看来,“有”和“无”并不是对立统一的关系,它们之间的关系也不存在不同情况下的不同状态,而是一种异常固定的、天然而不可改变的关系,这种关系简言之就是“无”为本“有”为末、“无”为体“有”为用。王弼虽然不是体用范畴的首创者,但他已初步形成了体用思维方式即已经自觉地运用体用观点分析问题,这是王弼哲学的一大显著特点,是王弼玄学思维达到历史新高峰的标志。 展开更多
关键词 王弼 本体 有无之辨 体用
下载PDF
PROGRESS IN ION BEAM ANALYSIS AT FUDAN UNIVERSITY
14
作者 杨福家 汤家镛 《Nuclear Science and Techniques》 SCIE CAS CSCD 1990年第Z1期1-9,共9页
Progres in ion beam analysis at Fudan University in the recent years is briefly reviewed. Presented as examples of the research activities performed in this field are the following projects: (1) Nuclear potential reso... Progres in ion beam analysis at Fudan University in the recent years is briefly reviewed. Presented as examples of the research activities performed in this field are the following projects: (1) Nuclear potential resonance scattering of 6.25 MeV and 4.25 MeV helium ions for simultaneous compositional analysis of carbon and oxygen in a Mylar, a SnInO, and some other film samples: (2) Determination of stoichiometry of a high-temperature superconducting Y-Ba-Cu-O sample by backscattering of 8.8 MeV helium ions; (3) Backscattering and channeling analysis of multilayered structures periodically consisting of layers of pure Si and alternate layers of Ge and Si, grown on (100) Si substrates by molecular beam epitaxy: (4) Studies of surface structure of Al(100) by the use of MeV ions backscattering and channeling surface peak: and (5) MeV ion microbeam analysis and the use of PIXE method in DNA study. etc. 展开更多
关键词 ION beam ANALYSIS non - RUTHERFORD BACKSCATTERING CHANNELING ANALYSIS of superlattice Surface structure study MeV ION MICROBEAM system
下载PDF
Optically Powered Temperature Measuring Instrument for Big Rotor
15
作者 ZHENG Dezhong(Yanshan University, Qinhuandao 066004, CHN) 《Semiconductor Photonics and Technology》 CAS 1997年第1期35-39,共5页
Abstract: A micro - power consumption non - contact temperature measuring instrument for big rotor is introduced. As it solves very well the signal coupling under high speed rotation and power supply problem for probe... Abstract: A micro - power consumption non - contact temperature measuring instrument for big rotor is introduced. As it solves very well the signal coupling under high speed rotation and power supply problem for probe, the instrument can realize persistent on - line temperature measurement for big rotor drived by the ordinary light transmitted by optical fiber under the room light. 展开更多
关键词 non - contact Measurement Optical Fiber ROTOR SemiconductorThermistor
下载PDF
Heat Production Rate Calculation of Thermal Manikin with a Compensation Method
16
作者 朱利军 张渭源 +1 位作者 陈文飞 陈景山 《Journal of China Textile University(English Edition)》 EI CAS 2000年第1期79-81,共3页
Thermal manikin plays important roles in simulating thethermal state of human bodies to facilitate the evaluationof thermal comfort properties of various clothing assem-blies.Based on the heat balance principle and an... Thermal manikin plays important roles in simulating thethermal state of human bodies to facilitate the evaluationof thermal comfort properties of various clothing assem-blies.Based on the heat balance principle and analysis ofrelated factors,the heat production rate of manikin isrecommended as an efficient evaluation index.Whereas,its inside heat production which occurs as a result of theexistence of temperature difference between its insidepart and outside surface,should not be ignored.Through a series of theoretical analysis and calculations,a compensative equation is deduced in this paper. 展开更多
关键词 thermal MANIKIN HEAT balance non - evapora-tive HEAT loss HEAT PRODUCTION RATE INNER HEAT PRODUCTION RATE CALCULATION compensation.
下载PDF
EFFECT OF STRUCTURE PARAMETERS OF POLYESTER ON ITS ALKALI REACTION RATE
17
作者 武谦 《苏州大学学报(工科版)》 CAS 1993年第S2期45-53,共9页
The effect of the supermoleclar structure of polyester on the effective alkali hy-drolysisis rate constant k has been investigated in the paper.That the average non-crvstal line volume around per crystal grain has a c... The effect of the supermoleclar structure of polyester on the effective alkali hy-drolysisis rate constant k has been investigated in the paper.That the average non-crvstal line volume around per crystal grain has a close relation to the k is proved byexperiments.A simple and effctive method for assessing what effect of the super-molecular structure on the k by its CDT value( Critical Dissolution Time) has beenput forward. 展开更多
关键词 Supermolecutar structure . CRYSTALLINITY CDT Value non - crystal volume. ALKALI HYDROLYSIS rate CON -stant.
下载PDF
Some Problems Concerning Geologic Structure with Double Layers in Urban Underground Lifeline Engineering
18
作者 Peng Yimin Sun JinzhongChina University of Geosciences , Beijing 100083 《Journal of Earth Science》 SCIE CAS CSCD 1991年第1期120-125,共6页
Underground lifeline engineering (ULE for short) in modern city demands the appreciation of an active fault in buried bedrock . Generally speaking , a large number of urban geological textures of a basement may all be... Underground lifeline engineering (ULE for short) in modern city demands the appreciation of an active fault in buried bedrock . Generally speaking , a large number of urban geological textures of a basement may all be simplified into a dual geological texture model , i. e., the upper part of the basement consists of loose covering layer and the lower part consists of bedrock . The study of an active fault should include three parts of contents , i . e ., to determine the lower time limit of activity of the fault , and the time limit must be recognized by both of designing engineers and geologists ; on the basis of the studies of repetition periods of earthquake occurrence to deter mine whether the fault moves or not during the allowed time of efficacy of buildings and constructions ; for the sake of engineering practice , the active rate of the fault must be given . The fault with different active mechanism has different effects on the ULE . The authors studied the effect of lateral non-uniform overburden site on the ULE by means of the supersonic earthquake modelling . Owing to the lateral non - uniformity of the covering sediments , there occurs an obvious jump of amplitude of the seismic wave propagation near the contact surface between two different sedi ments . In addition , from the modelling experiment curves it may be seen that the different focus mechanisms and different medium characters may also exert an effect in different degrees . 展开更多
关键词 underground lifeline engineering dual geological texture overlying layer active fault faulting mechanism supersonic seismic modelling experiment later al non - uniformity .
下载PDF
Substituting Effect of Y in La_(0.5) Ba_(0.5) CoO_3
19
作者 刘宜华 张汝贞 +3 位作者 王成建 岳龙强 季刚 梅良模 《Journal of Rare Earths》 SCIE EI CAS CSCD 2003年第3期347-350,共4页
La 0.5- x Y x Ba 0.5 CoO 3 polycrystals were prepared by solid state reaction. The substituting effects of Y for La on the magnetic and transport properties of the materials were studied systematically... La 0.5- x Y x Ba 0.5 CoO 3 polycrystals were prepared by solid state reaction. The substituting effects of Y for La on the magnetic and transport properties of the materials were studied systematically. The results indicate that substitution of Y induces two effects. Firstly, the charge transfer from Y to 3d orbital of Co happens. This causes the molecular magnetic moment to decrease. Secondly, the antiferromagnetic exchange interaction of Co ions appears. When the content of Y is less than or equal to 30%, the non colinear structure of spins in materials is observed. When the content of Y is greater than 30%, the materials transit from predominant ferromagnetic state to predominant antiferromagnetic one. The conductive mechanism for the materials with different content of Y belongs to the variable range hopping conduction of polarons. The resistivity of materials increases sharply with increasing Y content. 展开更多
关键词 La 0.5- x Y x Ba 0.5 CoO 3 compound charge transfer non colinear structure of spins variable range hopping conduction rare earths
下载PDF
施工质量检评中的一些问题
20
作者 张憞 《福建建筑高等专科学校学报》 2002年第2期88-90,93,共4页
分析施工质量检评中存在的一些问题 ,并提出相关的解决途径。做抛砖引玉之用 ,共同在施工质量控制上把好关 ,减少不合格建筑工程流入社会。
关键词 施工质量 检评 检评工具 非本体化 本体化 职业道德 从业素质
下载PDF
上一页 1 2 下一页 到第
使用帮助 返回顶部