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175篇 您的检索式:作者名="M.V."
    题名 作者 年代 出处 被引量
1A study on the mixing proportion in groundwater samples by using Piper diagram and Phreeqc model显示文摘Piper (1944) diagram has been the basis for several important interpretations of the hydrogeochemical data. As seen in this diagram, most natural waters contain relatively few dissolved constituents, with cations (metals or bases) and anions (acid radicles) in chemical equilibrium with one another. Apart from the facies representation, the composition of the mixed sample can be identified in terms of the composition of the parental solution. To bring out this advantage of the Piper diagram, a study was conducted in the Kalpakkam region of Tamilnadu, South India. By taking the geology and water table into consideration, two sample locations were selected as parent solution and third one as the mixture sample. All three samples were analyzed for calcium (Ca), magnesium (Mg), sodium (Na), potassium (K), chloride (Cl), sulphate (SO4) and phosphate (PO4) by Ion Chromatograph (Metrohm IC 861). HCO3 was determined by volumetric titration. The Piper diagram shows that parent solutions clustered towards Na-Mg-Ca-HCO3-Cl and Na-HCO3 facies, and the mixing sample belongs to Na-Mg-HCO3 facies. Phreeqc interac-tive (Ver 2.8) along with the original composition of the mixture sample was used to correlate the mixing proportion identified by the Piper diagram.Karmegam U. Chidambaram S. Prasanna M.V. Sasidhar P. Manikandan S. Johnsonbabu G. Dheivanayaki V. Paramaguru P. Manivannan R. Srinivasamoorthy K. Anandhan P 2011Chinese Journal Of Geochemistry2011,30,4:20
2高性能陶瓷断裂韧性的SEPB评价技术显示文摘本文综述和比较了高性能陶瓷断裂韧性(K_(1c))的各种测试技术,详细研究了桥压法(BridgeIndentation)制备预裂纹技术(SEPB)及基本原理.指出用 SEPB 法测得的 K_(1c)是其他多数方法的下限值,但这是相当可靠和稳定的测试技术,它克服了目前广为采用的 SENB 法的不足之处.对七种典型的高性能陶瓷分别采用五种不同的测试方法测定 K_(1c),比较结果,支持了上述观点.来亭荣 凌健荣 陆正兰 朱国强 庄红娟 Swain M.V. 1993无机材料学报1993,8,3:11
3结合临床概率、D-二聚体检测和CT的决策体系在疑似肺栓塞患者临床处理中的价值显示文摘Context: Previous studies have evaluated the safety of relatively complex combinations of clinical decision rules and diagnostic tests in patients with suspected pulmonary embolism. Objective: To assess the clinical effectiveness of a simplified algorithm using a dichotomized clinical decision rule, D-dimer testing, and computed tomography(CT) in patients with suspected pulmonary embolism. Design, Setting, and Patients: Prospective cohort study of consecutive patients with clinically suspected acute pulmonary embolism, conducted in 12 centers in the Netherlands from November 2002 through December 2004. The study population of 3306 patients included 82% outpatients and 57% women. Interventions: Patients were categorized as “ pulmonary embolism unlikely” or “ pulmonary embolism likely” using a dichotomized version of the Wells clinical decision rule. Patients classified as unlikely had D-dimer testing, and pulmonary embolism was considered excluded if the D-dimer test result was normal. All other patients underwent CT, and pulmonary embolism was considered present or excluded based on the results. Anticoagulants were withheld from patients classified as excluded, and all patients were followed up for 3 months. Main Outcome Measure: Symptomatic or fatal venous thromboembolism(VTE) during 3-month follow-up. Results: Pulmonary embolism was classified as unlikely in 2206 patients(66.7% ). The combination of pulmonary embolism unlikely and a normal D-dimer test result occurred in 1057 patients(32.0% ), of whom 1028 were not treated with anticoagulants; subsequent nonfatal VTE occurred in 5 patients(0.5% [95% confidence interval {CI}, 0.2% - 1.1% ]). Computed tomography showed pulmonary embolism in 674 patients(20.4% ). Computed tomography excluded pulmonary embolism in 1505 patients, of whom 1436 patients were not treated with anticoagulants; in these patients the 3- month incidence of VTE was 1.3% (95% CI, 0.7% - 2.0% ). Pulmonary embolism was considered a possible cause of death in 7 patients after a negative CT scan(0.5% [95% CI, 0.2% - 1.0% ]). The algorithm was completed and allowed a management decision in 97.9% of patients. Conclusions: A diagnostic management strategy using a simple clinical decision rule, D-dimer testing, and CT is effective in the evaluation and management of patients with clinically suspected pulmonary embolism. Its use is associated with low risk for subsequent fatal and nonfatal VTE.Huisman M.V. 黄浙勇 2006世界核心医学期刊文摘(心脏病学分册)2006,2,5:8
4某些国家的个别化教学显示文摘个性发展问题今天在教育科学中占有突出的地位,与此相关的是,民众性的学校必须去适应社会的今天和未来的挑战。教学的'民众性'和学生个人掌握知识的个别性之间的矛盾乃是个别化教学之必要性的客观前提。19世纪20世纪转折时期,在美国民众性学校的条件下,便曾经积极地寻求过个别化教学的解决办法。在美国许多学校里。M.V.克拉林 孙祖复 1992全球教育展望1992,22,6:7
51900年以来贝加尔湖水位变化及其原因分析显示文摘水位变化作为湖泊水文过程和水量平衡的动态反映,是湖泊生态环境的重要影响因素。全球最大的淡水湖——贝加尔湖,在自然变化与人为活动的双重影响下,过去100多年水位表现出较大的年内、年际和多年变化。贝加尔湖水位变化与入湖径流量变化密切相关,与贝加尔湖最大支流色楞格河的径流量变化较为一致。气候变暖带来的气温上升和降水减少使得入湖径流量减少,贝加尔湖水位下降。人类活动对贝加尔湖水位变化影响表现在两个方面:一方面,全球变暖条件下耕地面积扩张和灌溉用水增加导致贝加尔湖流域用水增加,使得入湖径流量减少,贝加尔湖水位下降;另一方面,1958年伊尔库茨克水电站投入运营之后,贝加尔湖水位变化受到了安加拉河水位顶托的影响。在下游水电站人为调控影响下,贝加尔湖年平均水位升高,年内水位波动幅度增加,年最低和最高水位出现日期推迟。地处全球气候与环境变化敏感区的贝加尔湖,其水位变化对湖泊及周边生态环境影响显著。因此,探究在全球变化背景下贝加尔湖的水位变化及影响因素对保护当地生态环境具有重要意义。王冠 王平 王田野 李泽红 于静洁 刘昌明 Bolgov M.V. 2018资源科学2018,40,11:6
6Muller细胞在增殖性糖尿病性视网膜病变中的作用显示文摘目的评价Muller细胞在糖尿病性视网膜病变(DR)视网膜新生血管形成中的作用。方法对239例(478只眼)非增殖期、增殖前期及早期增殖期DR病人进行了闪光视网膜电图(ERG)、局部ERG以及12、32、40赫兹闪烁光ERG检查,并计算纤维指数:闪光ERG的b波幅值/12赫兹闪烁光ERG幅值。此外,对37例增殖前期DR病人每间隔2~4个月进行动态电生理观察1-1.5年。结果非增殖期DR的32、40赫兹闪烁光ERGb波幅值位于正常低限,闪光ERG的a波幅值中度降低,为(54+9.6)μv,b波幅值正常;12赫兹闪烁光ERG幅值明显降低,为(25.8±9.4)μv,纤维指数平均为(9.3±1.4)单位。增殖前期DR的所有视网膜电反应均中度下降,闪光ERG的b波幅值为(179+19)μv,12赫兹闪烁光ERG幅值为(13.0±6.4)μv,纤维指数为10,16单位,平均(13.8+1.3)单位,有极显著增高(P〈0.001)。早期增殖期DR的闪光视网膜电图的a波和32、40赫兹闪烁光视网膜电图幅值继续下降,分别为(30.0±12.2)μv、(8.8±2.7)μv和(4.0±2.1)μv,纤维指数平均为:(13.5±2.2),有极显著增高(P〈O.001)。动态观察表明,原来增高的纤维指数突然下降,说明近期出现视网膜新生血管的可能性极大。结论纤维指数增高是视网膜缺血缺氧的共同特点,表明Muller细胞的代谢活性代偿性增高,证实其在视网膜新生血管形成中起重要作用。刘红 谷万章 陶源 周丽霞 Zueva M.V. 2009中国实用眼科杂志2009,27,9:4
7Preparation and hydrogen storage properties of nanocrystalline TiFe synthesized by mechanical alloying显示文摘In this research, the mechanism of mechanical alloying(MA) synthesis of TiFe intermetallic compound(IMC)from individual components Ti and Fe has been studied. The partition coefficient of the apparent diffusion and the reaction rate constant during MA solid-state synthesis of the TiFe intermetallic compound in a planetary ball mill have been estimated. The results indicate that the apparent diffusion coefficient is close to 10^(–11)cm^2/s that is approximately one order higher than the conventional high temperature diffusion coefficient. The reaction rate constant is close to 1.75·10^(-6). The relation between the structure and the hydrogen storage properties of MA synthesized IMC TiFe have been briefly discussed.V.Yu. Zadorozhnyy G.S. Milovzorov S.N. Klyamkin M.Yu. Zadorozhnyy D.V. Strugova M.V. Gorshenkov S.D. Kaloshkin 2017Progress in Natural Science:Materials International2017,27,1:3
8Use of numerical simulation for growing high-quality sapphire crystals by the Kyropoulos method显示文摘S.E. Demina E.N. Bystrova V.S. Postolov E.V. Eskov M.V. Nikolenko D.A. Marshanin V.S. Yuferev V.V. Kalaev 2007Journal of Crystal Growth2007,,:2
9Microstructure evolution during warm working of Ti–5Al–5Mo–5V–1Cr–1Fe at 600 and 800°C显示文摘S.V. Zherebtsov M.A. Murzinova M.V. Klimova G.A. Salishchev A.A. Popov S.L. Semiatin 2013Materials Science & Engineering A2013,,:2
10印度喀拉拉邦的教育分权计划:理想与现实显示文摘许多发展机构的文献都提倡通过教育分权管理策略来促进地方参与教育的行动。尽管这种倡导有着长远的历史,但事实上,在许多教育体系中的教育分权计划并没有取得成功。印度喀拉拉邦的“人民分权计划运动”试图采用一个多方位的“大爆炸”方式实施分权计划,它虽有力量,但也存在局限性,其主要障碍是地方当局的技术能力有限,以及未转变参与者态度,未向参与者充分证明分权是符合他们需要的。莫昆丹.M.V. 马克.贝磊 2005教育研究2005,26,3:2
11Microstructure and hydrogenation behavior of ball-milled and melt-spun Mg–10Ni–2Mm alloys显示文摘Y. Wu W. Han S.X. Zhou M.V. Lototsky J.K. Solberg V.A. Yartys 2007Journal of Alloys and Compounds2007,,1:2
12热应激对猪生产和代谢的影响显示文摘文章综述了热应激对猪的生产和代谢的影响,以及热应激对猪肠道健康的影响。并从饲养管理和营养措施两方面阐述了应对热应激的措施。其中营养措施包括:锌、乳制品、谷氨酰胺、抗氧化剂、地塞米松、甜菜碱的使用。M.V. Sanz-Fernandez S.K. Stoakes J.S. Johnson M. Abuajamieh J.T. Seibert S.C. Pearce N.K. Gabler R.P. Rhoads L.H. Baumgard 2014饲料工业2014,35,10:2
13黑龙江流域野生莲及其生物学特性显示文摘莲(Nelumbo nucifera Gaertn.)是经济、科学、文化、宗教价值并重的资源植物。黑龙江流域属于莲分布区的最北界。在前期对黑龙江省野生莲资源调查的基础上,本文重点对俄罗斯远东地区野生莲资源进行实地考察,共确定52个野生莲的自然种群。观测野生莲形态特征、物候及生活习性等基本生物学特性。分析野生莲种群的资源现状,提出对其保护和开发利用的建议。薛建华 曹晓青 科鲁高娃 M.V. 卢波措娃 Т.А. 2010国土与自然资源研究2010,,5:2
14Intermittent Androgen Deprivation for Locally Advanced and Metastatic Prostate Cancer: Results from a Randomised Phase 3 Study of the South European Uroncological Group显示文摘Fernando E.C. Calais da Silva Aldo V. Bono Peter Whelan Maurizio Brausi Anton Marques Queimadelos Jose A. Portillo Martin Ziya Kirkali Fernando M.V. Calais da Silva Chris Robertson 2009European Urology2009,,6:2
15Perspectives of the potential implications of wine polyphenols on human oral and gut microbiota显示文摘T. Requena M. Monagas M.A. Pozo-Bayón P.J. Martín-álvarez B. Bartolomé R. del Campo M. ávila M.C. Martínez-Cuesta C. Peláez M.V. Moreno-Arribas 2010Trends in Food Science & Technology2010,,7:2
16Conducting polymers-based electrochemical supercapacitors—Progress and prospects显示文摘R. Ramya R. Sivasubramanian M.V. Sangaranarayanan 2013Electrochimica Acta2013,,:2
17Stratigraphic distribution of macerals and biomarkers in the Donets Basin: Implications for paleoecology, paleoclimatology and eustacy显示文摘A. Izart R.F. Sachsenhofer V.A. Privalov M. Elie E.A. Panova V.A. Antsiferov D. Alsaab T. Rainer A. Sotirov A. Zdravkov M.V. Zhykalyak 2005International Journal of Coal Geology2005,,1:2
18查看详情显示文摘M.V. Reddy T. Yu C.H. Sow Z.X.Shen C.T.Lim G.V.S.Rao B.V.R.Chowdari 0,,:1
19Impact performance of nanophased foam core sandwich composites显示文摘M.V. Hosur A.A. Mohammed S. Zainuddin S. Jeelani 2008Materials Science & Engineering A2008,,1:1
20Manufacturing and low-velocity impact characterization of foam filled 3-D integrated core sandwich composites with hybrid face sheets显示文摘M.V. Hosur M. Abdullah S. Jeelani 2004Composite Structures2004,,2:1
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