检索结果-南通市图书馆

Journal of Arid Land 2016年第2期8卷 264-271页

作者： zhuang yanli ZHAO Wenzhi Linze Inland River Basin Research Station Chinese Ecosystem Research Network Key Laboratory of Ecohydrology of Inland River Basin Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences

It is important to understand the effects of dew events on non-mucilaginous seed germination of annual desert plant species during dry seasons, which is critical to maintaining long-term soil seed banks in a harsh desert environment. We hypothesize that dew deposition also assists in the non-mucilaginous seed germination of annual desert species. A common field dew treatment experiment was conducted in the Linze Inland River Basin Research Station to investigate the effects of dew deposition on the seed germination of four annual species, including Agriophyllum squarrosum, Corispermum mongoficum, Bassia dasyphylla and Halogeton arachnoideus. The results showed that the presence of dew significantly increased seed germination percentages and decreased the nonviable seed percentages of B. dasyphylla and H. arachnoideus, whereas there was no such trend for the seeds of C. mongolicum and A. squarrosum. The ecological effects of dew on the seed germination and viability of the annual desert plants were species specific. Although dew wetting is insufficient to cause seed germination, it may help in priming the seeds.

关键词： dew deposition seeds hydration and dehydration seeds viability

Relationship between dew presence and Bassia dasyphylla plant growth

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2012年第1期4卷 11-18页

作者： yanli zhuang Sophia RATCLIFFE Linze Inland River Basin Research Station Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhou 730000China Hydrology and Ecology Laboratory of Watershed Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhou 730000China Institute for Special Botany and Functional Biodiversity University of Leipzig

Dew has been recognized for its ecological significance and has also been identified as an additional source of water in arid zones. We used factorial control experiment, under dew presence in the field, to explore photosynthetic performance, water status and growth response of desert annual herbage. Bassia dasyphylla seedlings were grown in contrasting dew treatments （dew-absent and dew-present） and different watering regimes （normal and deficient）. The effects of dew on the water status and photosynthetic performance of Bassia dasyphylla grown in a desert area of the Hexi Corridor in Northwestern China, were evaluated. The results indicated the pres- ence of dew significantly increased relative water content （RWC） of shoots and total biomass of plants in both water regimes, and enhanced the diurnal shoot water potential and stomatal conductance in the early morning, as well as photosynthetic rate, which reached its maximum only in the water-stressed regime. The presence of dew increased aboveground growth of plants and photosynthate accumulation in leaves, but decreased the root-to-shoot ratio in both water regimes. Dew may have an important role in improving plant water status and ameliorating the adverse effects of plants exposed to prolonged drought.

关键词： dew Bassia dasyphylla water status photosynthesis performance biomass allocation pattern

An efficient method to engage oxide ceramics in low-temperature interfacial reactions: Microstructure evolution and kinetics behaviors based on supercooling in a transient liquid phase bonding joint

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第20期151卷 234-244页

作者： Jia Yang Wanqi Zhao Panpan Lin Qiuguang Zhang Xinfei Zhang Tiesong Lin Peng He yanli zhuang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China AECC Shenyang Liming Aero-Engine Co. LtdShenyang 110043China Heilongjiang Provincial Key Laboratory of CO_(2) Resource Utilization and Energy Catalytic Materials School of Material Science and Chemical EngineeringHarbin University of Science and TechnologyHarbin 150040China

Ductile transient liquid phase(TLP)bonding joints reinforced by multiple precipitates were produced using novel pre-sintered coatings and Au-Si fillers;therefore,the highest strength of NiTi/sapphire joints brazed at 460℃ for 30 min reached 72 *** pre-sintering process improved the surface-active of sapphire by forming metastable Ti_(3)O and non-stoichiometric Al_(2)O_(3).The typical brazing seam consisted of O-rich compounds,TiSi_(2),and Ti-Ni-Si,wherein the O-rich phase featured different crystallinity depending on the oxygen *** sapphire/seam interface was either a nanoscale diffusion region or a Si-rich amorphous *** breakdown of the Stokes-Einstein relation(SER)occurred,and the deviation from SER increased with a higher cooling *** influence of coating thickness was reflected in(i)the supercooling related to the viscosity and fractional exponent of liquids and(ii)the microstructural change of the joint related to the driving force for crystal *** work presented a new strategy for joining ceramics to metals at lower temperatures but using the joint at higher temperatures;furthermore,gave an insight into the microstructure evolution and kinetics behaviors based on supercooling in a transient liquid phase bonding joint.

关键词： Reinforced ductile fillers Transient liquid phase bonding Surface modification Kinetic behaviors

Deformation monitoring and analysis at two frost mounds during freeze–thaw cycles along the Qinghai–Tibet Engineering Corridor

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

Research in Cold and Arid Regions 2017年第4期9卷 378-383页

作者： LiHui Luo Wei Ma yanli zhuang ZhongQiong Zhang Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences LanzhouGansu 730000 China State Key Laboratory of Frozen Soils Engineering Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou Gansu 730000 China

This paper presents various deformation-monitoring technologies employed to monitor the frost heave and thaw settlement of two mounds along the Qinghai–Tibet Engineering Corridor(QTEC), China. The QTEC is known as a critical infrastructure and passage connecting inland China and the Qinghai–Tibet Plateau(QTP). Three technologies—global navigation satellite system(GNSS), terrestrial laser scanning(TLS), and unmanned aerial vehicle(UAV)—were used to estimate the freeze/thaw–induced 3D surface deformation of two frost mounds. Our results showed that (1) the two frost mounds exhibited mainly thaw settlement in thawing periods and frost heave in the freezing period, but frost heave dominated after repeated freeze–thaw cycles;(2) different zones of the mounds showed different deformation characteristics;(3) active-layer thickness(ALT) and elevation changes were highly correlated during thaw periods;(4) integrated 3D-measurement technologies can achieve a better understanding and assessment of hazards in the permafrost area.

关键词： frost mound thaw settlement frost heave freeze–thaw cycles surface deformation

高效液相色谱法测定大鼠血浆中丹参素和原儿茶醛

在线全文

学校读者我要写书评

暂无评论

药学学报 1999年第8期34卷 613-616页

作者：庄燕黎晁若冰华西医科大学药学院

目的：为了解大鼠ｉｍ丹参注射液和ｉｇ丹参提取物后丹参素和原儿茶醛的吸收情况，建立了高效液相色谱法测定大鼠血浆中丹参素和原儿茶醛的含量。方法：用高效液相色谱内标法测定。色谱柱为ＯＤＳ柱，流动相为乙腈—００１ｍｏｌ·Ｌ... 详细信息

目的：为了解大鼠ｉｍ丹参注射液和ｉｇ丹参提取物后丹参素和原儿茶醛的吸收情况，建立了高效液相色谱法测定大鼠血浆中丹参素和原儿茶醛的含量。方法：用高效液相色谱内标法测定。色谱柱为ＯＤＳ柱，流动相为乙腈—００１ｍｏｌ·Ｌ－１磷酸二氢钾溶液（８∶９２），磷酸调至ｐＨ２８，在２８０ｎｍ波长处检测。以对羟基苯甲酸为内标。结果：用所建立的方法测定了大鼠ｉｍ丹参注射液后丹参素和原儿茶醛的血药浓度，并考察了大鼠ｉｇ丹参提取物后的吸收情况。结果表明，丹参素和原儿茶醛可经肌肉和胃肠道吸收入血。结论：丹参素和原儿茶醛可作为丹参注射液和含丹参口服制剂的指标成分。

关键词：高效液相色谱法丹参素原儿茶醛血药浓度

在线全文

学校读者我要写书评

暂无评论

干旱区凝结水研究进展

地球科学进展 2008年第1期23卷 31-38页

作者：庄艳丽赵文智中国科学院寒区旱区环境与工程研究所寒旱区流域水文及应用生态实验室

凝结水是维系干旱、半干旱地区主要食物链的水分来源之一,具有重要的生态意义。较详细地列举了目前国内外在干旱区测定凝结量及其持续时间所采用的研究方法,从凝结水的数量特征以及时间格局两方面阐述了不同地域凝结水的时空差异性,并... 详细信息

凝结水是维系干旱、半干旱地区主要食物链的水分来源之一,具有重要的生态意义。较详细地列举了目前国内外在干旱区测定凝结量及其持续时间所采用的研究方法,从凝结水的数量特征以及时间格局两方面阐述了不同地域凝结水的时空差异性,并从气象因素、凝结面的类型及其位置、周边植被对其作用等方面综合分析了影响凝结水发生的主要因素,探讨了干旱区凝结水的生态作用及其意义,展望了干旱区凝结水未来的研究趋势。提出在未来的干旱区凝结水研究中应加强与气象学、生态学等多学科的交叉,从能量平衡角度加强对凝结水量的研究;同时,改进和规范凝结水的测量方法,开展荒漠植被对凝结水的生理响应研究以及凝结水对极端干旱胁迫植物的作用研究。

关键词：干旱区凝结水研究方法时空特征生态作用

掏空与机会主义支撑行为——基于关联交易视角的案例分析

在线全文

学校读者我要写书评

暂无评论

经济与管理 2015年第6期29卷 41-47页

作者：甄红线庄艳丽东北财经大学会计学院/中国内部控制研究中心辽宁大连116025 中国建筑第八工程局天津分公司天津300452

基于关联交易的视角,选取ST河化公司进行案例研究,分析大股东采取掏空和支撑行为的动机、选择掏空和支撑行为的时机以及实施掏空和支撑行为的手段。研究发现,关联交易是大股东进行掏空和支撑行为的重要方式,并且具有一定的隐蔽性。当上... 详细信息

基于关联交易的视角,选取ST河化公司进行案例研究,分析大股东采取掏空和支撑行为的动机、选择掏空和支撑行为的时机以及实施掏空和支撑行为的手段。研究发现,关联交易是大股东进行掏空和支撑行为的重要方式,并且具有一定的隐蔽性。当上市公司的财务状况良好时,大股东一般会对上市公司进行掏空;当上市公司陷入财务困境(例如被ST)时,大股东会对上市公司进行支撑,使上市公司免于退市。大股东的支撑行为表面上是为了提高公司业绩,其最终目的则是为了今后继续掏空上市公司,以获得长期利益,因此是一种机会主义行为。

关键词：大股东关联交易掏空机会主义支撑

在线全文

学校读者我要写书评

暂无评论

钒硼酸盐红色荧光粉制备工艺研究

化工新型材料 2011年第11期39卷 64-66页

作者：董丽敏庄艳丽车厚钊张显友哈尔滨理工大学哈尔滨150040

钒酸盐在真空紫外的吸收截面较大,并且具有有效的基质敏化带,被认为是优良的荧光粉基质材料。通过研究发现,将硼酸三丁酯引入到钒酸盐之中,形成了钒硼酸盐体系,将其作为红色荧光粉的基质材料,可以改善红色荧光粉的纯度和发光强度。采用... 详细信息

钒酸盐在真空紫外的吸收截面较大,并且具有有效的基质敏化带,被认为是优良的荧光粉基质材料。通过研究发现,将硼酸三丁酯引入到钒酸盐之中,形成了钒硼酸盐体系,将其作为红色荧光粉的基质材料,可以改善红色荧光粉的纯度和发光强度。采用共沉淀法合成了Y0.9B0.3V0.7O3.7∶0.04Eu3+,0.06Gd3+红色荧光粉,通过XRD、扫描电子显微镜(SEM)和荧光分光光度仪对粉体的结构、形貌及荧光性能进行了分析,研究其最佳的制备工艺条件。结果表明,Y0.9B0.3V0.7O3.7∶0.04Eu3+,0.06Gd3+是一种球形颗粒的混合物,其最佳的制备条件是pH=7,水浴温度为70℃,煅烧温度为1200℃。

关键词：共沉淀法钒硼酸盐红色荧光粉

在线全文

学校读者我要写书评

暂无评论

气泡法测定血清中尿激酶的活性

中国现代应用药学 2000年第4期17卷 308-310页

作者：孟德鸣庄燕黎史炳照上海医药工业研究院药理室上海200437

目的 :考察气泡法可否用于血清中尿激酶 (UK)的活性测定。方法 :用气泡法测定加入不同量的血清后尿激酶的活性 ,以及小鼠静脉注射尿激酶后不同时间血清中尿激酶的活性。结果 :随着血清量的增加达终点的时间延长 ;小鼠静脉注射尿激酶后 ,... 详细信息

目的 :考察气泡法可否用于血清中尿激酶 (UK)的活性测定。方法 :用气泡法测定加入不同量的血清后尿激酶的活性 ,以及小鼠静脉注射尿激酶后不同时间血清中尿激酶的活性。结果 :随着血清量的增加达终点的时间延长 ;小鼠静脉注射尿激酶后 ,10min后仍可检测到尿激酶的活性。结论 :气泡法可用于血清中尿激酶活性的测定。

关键词：气泡法尿激酶纤溶活性血清

溶剂热法制备CeO_(2)/BiOI复合光催化剂及性能

在线全文

学校读者我要写书评

暂无评论

哈尔滨理工大学学报 2023年第3期28卷 119-128页

作者：米世新牟红旭王剑浩杨陆娟吴鹏伟刘子薇庄艳丽哈尔滨理工大学材料科学与化学工程学院哈尔滨150080

针对提高单体BiOI的可见光催化降解效率的问题,采用煅烧法在不同温度下制备出了CeO_(2)三维花型结构,然后将CeO_(2)加入到BiOI前驱体溶液中,通过溶剂热法制备出不同复合比例的BiOI/CeO_(2)复合光催化剂。运用X射线粉末衍射(XRD)、扫描... 详细信息

针对提高单体BiOI的可见光催化降解效率的问题,采用煅烧法在不同温度下制备出了CeO_(2)三维花型结构,然后将CeO_(2)加入到BiOI前驱体溶液中,通过溶剂热法制备出不同复合比例的BiOI/CeO_(2)复合光催化剂。运用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、紫外-可见漫反射光谱(UV-Vis DRS)、电化学等对制备样品进行表征,利用对罗丹明B(RhB)的降解实验评价了不同CeO_(2)煅烧温度、不同复合比例对光催化降解效率的影响,并通过自由基捕获实验对复合材料的光催化机理进行了分析。结果表明,当BiOI与CeO_(2)(煅烧温度为400℃)的质量比为1∶1时,复合材料对RhB的降解率最佳,约为38.1%。相比于BiOI(约为24%)和CeO_(2)(约为23%)其降解率有了一定的提高。这可能归因于两种材料复合后在界面处形成的异质结结构有效地抑制了光生电子-空穴的复合速率,实现了光催化性能的提高。

关键词： CeO_(2) BiOI 溶剂热法光催化性能

维普期刊数据库博看期刊