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Search Results: 1 - 10 of 290627 matches for " 姜刘志 "
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安塞县退耕还林背景下退耕区农户农业生产效率分析
盈盈,
北方园艺 , 2013,
Abstract: 退耕还林工程实施十几年来,退耕区生态环境得到明显改善,而作为退耕主体的农户的农业生产也成为了社会关注的焦点,对其研究可以揭示退耕还林对农业生产的冲击和影响。现利用DEA模型,以陕西省安塞县为样本区对退耕农户的农业生产效率进行了测算和分析。结果表明退耕区农户的农业生产效率有所提高;大部分农户的农业生产处于规模收益递增状态。并根据这一结论给出了相关的建议。
菱叶红景天多糖的提取、纯化鉴定及理化特性研究
,华年
食品科学 , 2005,
Abstract: ?以有效的热溶水提法,从菱叶红景天植物中得到粗多糖rhp。rhp经乙醇分级得三个级分rhp-i,rhp-ii,rhpiii,取rhpiii脱蛋白,脱色,dead-纤维素柱层析,saphadex g-200柱层析分离纯化,色谱鉴定及初步理化特性分析,得一纯度较高的均一多糖rhps。pc分析其单糖组成有l-阿拉伯糖、l-鼠李糖、d-葡萄糖和另一个待确定的组分组成。
陆相碎屑岩中粘土矿物的形成机理及蚀变规律—以济阳坳陷始新统孔店组为例
Formation Mechanism and Alteration of Clay Minerals in Clastic Rocks—Take the Kongdian Fm. of Paleogene in Jiyang Depression for Example
 [PDF]

, 谭先锋, 王杰, 冉天, 沈杰, 徐小斐,
Advances in Geosciences (AG) , 2015, DOI: 10.12677/AG.2015.56047
Abstract: 粘土矿物是碎屑岩中重要的填隙物,对油气储层有着重要的地质意义。本文利用X衍射、扫描电镜、铸体薄片和电子显微镜等方法,对济阳坳陷始新统孔店组粘土矿物的特征、形成机理、蚀变规律及影响因素进行了研究。结果表明:济阳坳陷始新统孔店组所含粘土矿物主要为伊利石、高岭石、绿泥石和伊/蒙混层,伊利石在扫描电镜下呈蜂窝状、丝缕状和丝带状,高岭石呈书页状、蠕虫状,绿泥石呈叶片状、细鳞片状,伊/蒙混层则呈不规则细粒状、鳞片状;粘土矿物的形成机理可分为陆源碎屑粘土矿物形成机理和自身粘土矿物形成机理两种,陆源碎屑粘土矿物形成机理与水动力强度有关,自生粘土矿物的形成机理受地温,成岩流体性质的影响,在一定的温度下,成岩流体在碱性范围内易形成蒙脱石、伊利石、绿泥石而在酸性范围内则有利于高岭石的形成;古地温和成岩流体共同控制了粘土矿物的形成机理和蚀变过程,当地温为70℃~140℃时,蒙脱石和高岭石蚀变形成伊利石;当地温升高到100℃~140℃时,伊/蒙混层蚀变成伊利石;当成岩流体由酸性变为碱性时,高岭石蚀变形成绿泥石;当成岩流体碱性逐渐变强时,蒙脱石蚀变形成伊利石和绿泥石。
Clay minerals are the important fillings in clastic rocks, have important geological significance for oil and gas reservoir. In this paper, the characteristics, formation mechanism, alteration law and influence factors of the clay minerals in the new system of Jiyang Depression are studied by means of X diffraction, scanning electron microscopy, and electron microscopy. The results show: The Eocene Kongdian formation of clay minerals such as illite, kaolinite, chlorite and illite/smectite in Jiyang depression, Illite honeycomb, silk thread and ribbon shaped under the scanning electron microscope, a book like kaolinite, chlorite, wormlike, lobular flake, Illite/smectite irregular gra-nular, flake; The formation mechanism of clay minerals can be divided into mineral terrigenous detrital clay mineral formation mechanism and its mechanism of two kinds of clay. The formation mechanism of terrigenous detrital clay minerals associated with hydrodynamic intensity. The formation mechanism of the in-situ clay minerals is influenced by the temperature and the fluid properties. At a certain temperature, into the rock and fluid in the alkaline range to form mont-morillonite, illite and chlorite in the acidic range is conducive to kaolinite formation; The formation mechanism and alteration process of clay minerals are controlled by the paleo temperature and the formation of the fluid. When the temperature of the local temperature was 70 - 140, the montmorillonite and kaolinite altered to form illite; The local temperature rises to 100 - 140 DEG C, illite/smectite illite alteration; When the diagenetic fluid from acid to alkaline, kaolinite chlorite alteration was formed; When the alkaline diagenetic fluid gradually becomes stronger, montmo-rillonite alteration of illite and chlorite is formed.
我国高新技术开发区比较研究
庞莹,,
科技进步与对策 , 2009,
Abstract: 以网络效应经济理论、产业经济学理论和西方经济学理论为基础,运用定量和定性方法,从产业集群的形成、产业集群的生产过程以及产业集群创新3个方面,针对我国53个高新区进行比较,提出改善区位布局、调整结构、加强制度建设等提高我国高新区网络效应的建议。区域经济产业集群高新技术产业开发区
番茄汁饮料品质改良技术研究
,孟立,华年
食品科学 , 2005,
Abstract: ?本文探讨了番茄汁饮料加工过程中的几个关键技术点:1.番茄的破碎方法对番茄汁粘度的影响;2.防止产品分层不稳定现象;3.口感的改良及其最佳配方工艺参数的确定。结果表明,采用85℃、30s热破碎榨汁工艺,0.3%茶多酚作护色剂,以8%蔗糖,0.25%柠檬酸,0.13%复合稳定剂,65%原汁含量为配方组成,可得到品质优良的番茄汁饮料产品。
高迁移率族蛋白与真核基因表达调控
徐 佳?,锋?, 勇?
生物化学与生物物理进展 , 2005,
Abstract: 高迁移率族蛋白(highmobilitygroupprotein,hmg)是一系列的染色质相关蛋白,广泛存在于真核生物细胞中,含量丰富,因其在聚丙烯酰胺凝胶电泳中的高迁移率而得名.hmg蛋白家族可分为hmgb、hmga和hmgn三类亚家族,各亚家族有其特征的结构域,这些结构域介导了hmg和dna或染色质相关区域的相互作用.现已发现这些蛋白质具有多种重要生物学功能,其中几乎所有hmg都可以通过修饰、弯曲或改变染色质/dna的结构,促进各种蛋白质因子形成大分子复合物来调节基因转录.
三峡工程蓄水前后长江中下游环境流特征变化研究

王学雷,
王学雷
,

- , 2015,
Abstract: 环境流是为保障河流生态系统健康发展、河流生态功能得以恢复的一种水文情势过程.三峡水利工程的建设,也改变了长江的天然水文情势,也直接或间接影响该流域重要生物资源,改变生物群落的结构组成分布等,从而对长江中下游一定范围内的生态与环境带来深远影响.基于IHA分析法,研究三峡蓄水前后长江中下游的生态水文特征变化及环境流指标变化.结果表明:长江中下游4个水文站的环境流组成在三峡蓄水前后呈不同程度的变化;环境流组成也逐渐趋于单一化,各水文站的流量事件以枯水流量事件和高脉冲流量事件为主;三峡蓄水对大、小洪水事件和特枯流量事件的影响较为显著;三峡工程运行对长江中下游生态水文指标和环境流指标的影响,整体上表现出随着离三峡大坝距离的增加而有不同程度减弱的趋势;沿程汉江支流的汇入,以及洞庭湖、鄱阳湖对长江干流水文情势的调蓄作用在一定程度上缓解了三峡蓄水带来的影响.
药用微生物资源
张华,成林,徐丽华,
微生物学通报 , 2004,
Abstract: 药用微生物主要包括放线菌、真菌和细菌等 ,是一类可持续发展利用的天然资源。本文主要从药用微生物资源的角度 ,简要阐述了几十年来与微生物紧密相关的抗生素、非抗菌类生物活性物质的发展情况和发展趋势。
云南和广东部分热泉Alicyclobacillus分布及系统发育
,成英,双江
微生物学通报 , 2004,
Abstract: 从云南和广东热泉采集的样品中富集分离得到12株嗜热或微嗜热的嗜酸杆菌,革兰氏染色阳性或不定,营异养生长,最适pH为3.5-5.5,最适温度为43℃-52℃。测定其16SrDNA序列表明这些菌株与脂环酸芽孢杆菌属亲缘关系最近,结合其形态、生理等特性,鉴定这些菌株属于脂环酸芽孢杆菌。
Division of Lithological Units and Geological Evolution of Early Precambrian Basement in Dahuanggou Banshigou Region, South Jilin Province
吉林省大荒沟—板石沟早前寒武纪基底的岩石单元划分及其地质演化

Jiang Jisheng,
继圣
,

岩石学报 , 1997,
Abstract: The Early Precambrian basement in Dahuanggou banshigou region of South Jilin Province comprises main four lithological units,i.e. metasupracrustal rocks,coarse biotite felsic gneisses, potassium granites and metabasic rocks. An attempt has been made to elucidate the petrography, geochemistry, metamorphism, geochronology and the relation of these rocks in the paper.Based on the results obtained from the research,we present an outline of the evolution of South Jilin Archean terrain.In the Middle Archean supracrustal rocks were formed. Then amphibolite facies metamorphism happened at 2 6Ga,accompainied by ductile shear deformation.Later plutonic TTG intruded.In Late Archean this region underwent epidote amphibolite metamorphism around 2 53Ga,and later there occurred an event of NE directed ductile shear deformation.In Early Proterozoic, potassium granite intruded and then underwent greenschist facies metamorphism at about 2 3Ga. Two events of NW and NE shear deformation also occurred at the later stage of the final regional metamorphism.
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