共查询到20条相似文献，搜索用时 140 毫秒
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磁共振功能成像在临床医学中的应用──脑血栓形成的fMRI研究 总被引：1，自引：0，他引：1
目的：评价磁共振功能成像（fMRI）在临床医学中的应用。材料与方法：应用GE公司SignaHorizon磁共振成像系统及血氧含水平（BOLD）法,对16例脑血栓形成患者进行检查。T1加权像应用自旋回波（SE,spinecho）序列,T2应用单次激发回波平面成像（EPI,echoplanaimaqing）序列。实验采取对照—任务—对照—任务或任务—对照—任务—对照范式,应用SunSpare工作站。有关数据处理软件以及t-检验与相关分析等统计学方法对数据进行处理。结果：对照组多数患者短期内病情稳定,停脱水降颅压药后,很快复发.只有一例四十岁男性例外。fMRI显示仅2例本组患者大脑皮质初级运动区有激活。实验组患者指疗期内病情稳定,一个疗程内功能明显恢复。fMRI显示实验组患者大脑皮质初级运动区明显激活。结论：磁共振功能成像在检测脑血栓形成患者功能恢复方面是一个客观而有效的手段,同时亦提示脑血栓形成急性期应用改善脑血管微循环药物疗效巩固,应用与不用相比有明显差别。 相似文献
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《CT理论与应用研究》1996,(2)
图像清晰／信息丰富的威达ＬＭＷ－１０００磁共振成像系统ＴｈｅｍｏｒｅｃｌｅａｒＬＭＷ－１００ＭＲＩＩｍａｇｉｎｇＳｙｓｔｅｍｗｉｔｈＧｒｅａｔＥｆｆｅｃｔｏｆＤｉａｇｎｏｓｔｉｃＲａｄｉｏｌｏｇｙ￥（ＧｕａｎｋｄｏｎｋＷｅｉｄａＭｅｄｉｃａｌＧｒｏｕ... 相似文献
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李兴才 《地震学报(英文版)》1994,7(3):409-414
Ｐｒｏｍｏｔｉｎｇｅｆｆｅｃｔｓｏｆ１９７５ＨａｉｃｈｅｎｇｆｏｒｅｓｈｏｃｋｓｏｎｔｈｅｏｃｃｕｒｒｅｎｃｅｏｆｔｈｅｍａｉｎｓｈｏｃｋＸｉｎｇ－ＣａｉＬＩ（李兴才）（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，ＳｔａｔｅＳｅｔｉｓｍｏｌｏｇｉｃａ... 相似文献
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Ｖａｒｉａｔｉｏｎｏｆｓｔｒｅｓｓｆｉｅｌｄｉｎｔｈｅｓｏｕｒｃｅｒｅｇｉｏｎａｒｏｕｎｄａｓｔｒｏｎｇｓｈｏｃｋ：ａｎｅｘａｍｐｌｅＧｕｔ－ＬｉｎｇＤＩＡＯ（刁桂苓），Ｌｉ－ＭｉｎＹＵ（于利民）ａｎｄＱｉｎ－ＺｕＬＩ（李钦祖）（Ｓｅｉｓｍｏｌｏｇｉ... 相似文献
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目的探讨ＰＨ值对Ｆｅ－ＥＤＴＡ造影效果的影响。方法;配制ＰＨ梯度５０－８０的０．５和０．１ｍｍｏｌ／Ｌ的Ｆｅ－ＥＤＴＡ液,观察ＳＥ序列「ＴＲ（ｍｓ）／ＴＥ（ｍｓ）２００／１５,２５００／８０」,信号变化,结果：Ｆｅ－ＥＤＴＡ的ＭＲ信号随ＰＨ值提高而减弱。 相似文献
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Ｒｅｓｅａｒｃｈｏｎｐｒｅｄｉｃｔｉｏｎｏｆｔｈｅｆｏｌｏｗｉｎｇｎｏｔｉｃｅ┐ａｂｌｅｓｈｏｃｋｓｏｆｅａｒｔｈｑｕａｋｅｓｅｑｕｅｎｃｅｓＰＵ－ＸＩＯＮＧＬＩＵ（刘蒲雄），ＸＩＵ－ＱＩＣＨＥＮ（陈修启），ＸＩＡＯ－ＪＩＡＮＬＵ（吕晓健）ａｎｄＤ... 相似文献
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李白基 《地震学报(英文版)》1996,9(2):289-297
ＶａｒｉａｔｉｏｎｓｉｎｓｈｅａｒｗａｖｅｓｐｌｉｔｔｉｎｇｄｕｒｉｎｇａｆｔｅｒｓｈｏｃｋｓｏｆｔｈｅＬｕｑｕａｎｅａｒｔｈｑｕａｋｅｉｎＹｕｎｎａｎＰｒｏｖｉｎｃｅＢＡＩ－ＪＩＬＩ（李白基）（ＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕｏｆＹｕｎｎａｎ... 相似文献
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Ｅｘｐｅｒｔｓｙｓｔｅｍｆｏｒｅａｒｔｈｑｕａｋｅｐｒｅｄｉｃｔｉｏｎ（ＥＳＥＰ）（２）－ＫｎｏｗｌｅｄｇｅｒｅｐｒｅｓｅｎｔａｔｉｏｎａｎｄｅｖｉｄｅｎｃｅｃｏｍｂｉｎａｔｉｏｎＨｏｎｇ－ＳｈｕｎＦＡＮ（范洪顺）ａｎｄＢｉ－ＱｕａｎＷＡＮＧ（王碧泉... 相似文献
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叙述了在FreeBSD环境下构建基于PPTP的VPN网关的过程和技术，分析了基本概念、实现方式以及在江西省地震信息网的实际应用等。 相似文献
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At present the development together with an intensification of anaerobic processes calls for methods of observation and control. It is very important to know intermediate metabolites of anaerobic microorganisms and the activity of methanogenic ones. Presented analytical methods are GLC analyses of lower fatty acids, alcohols, aldehydes and ketones and components of biogas. The chromatography using steam as a mobile phase is also mentioned. The method of determining the fluorescent coenzyme F420 was tested and modified. This coenzyme is specific for methanogenic microorganisms and is closely linked with their activity. The determination of the total activity of the hydrogenase system of anaerobic microorganisms by means of the rate of the consumption and evolution of molecular hydrogen was also presented. The applicability and effectivenes of these methods were verified on natural samples. All the methods mentioned above give satisfactory results with available equipment, materials and techniques. 相似文献
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Mostafa Baniasadi Mohammad Reza Zare' Mehrjordi Hossein Mehrabi Boshrabadi Hamid Reza Mirzaei Khalilabad Abbas Rezaei Estakhrooye 《Ground water》2020,58(4):560-570
In recent decades, increased extraction of groundwater for human and agriculture consumption has led to a substantial drop in groundwater level in large areas of across the world. Declining groundwater levels is a serious problem in itself and has multiple economic, social, cultural, political, security-related, and environmental externalities. The negative economic-environmental externalities of overextraction of groundwater in the Orzouiyeh plain in the Kerman Province, Iran, were evaluated using methods such as replacement cost, production function, market prices, shadow price, and the value of the input marginal product. After evaluating externalities, the Positive Mathematical Programming method was used to evaluate different water policies to reduce the consumption of groundwater. The total economic losses due to the externalities were calculated to equal 2.8 U.S. million dollars. The damages caused by environmental externalities were calculated to equal 436.1 U.S. million dollars. The results related to the positive planning model show that the best policy among different options, such as deficit irrigation policy or combined policies, involves implementation of pressurized irrigation systems. 相似文献
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山西大同数字遥测地震台网记录的震相特征 总被引：1，自引：0，他引：1
从地球及地壳的分层结构出发，使用较成熟的理论，从地震波传播的基本原理入手，结合多年的震相观察分析工作实践，选取了山西大同数字遥测地震台网近年来的一些典型震相进行了分析，得出本台网记录到震中距小于100km的地方震震相有Pg，P11，Sg，S11震中距在100km～500km的近震震相有Pn，Pg，P11，Sn，Sg,S11对比分析了在本台网内及周边地区发生的爆破与天然地震在震相上的差异性，并对其特征作了较详细的描述。 相似文献
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对兰州地震研究所的三段历史作回顾,分别为国家地震局、中国地震局兰州地震研究所的体制沿革变迁,中国科学院地球物理研究所;中国科学院兰州地球物理研究所观象台早期创建;兰州地震研究所硕士点早期阶段。 相似文献
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Studia Geophysica et Geodaetica - 相似文献