检索结果-南通市图书馆

Forecast of Geological Gas Hazards for “Three-Soft” Coal Seams in Gliding Structural Areas

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2007年第4期17卷 484-488页

作者： WANG Zhi-rong CHEN ling-xia CHENG Cong-ren LI Zhen-xiang College of Resource and Security Engerneering China University of Mining ＆ Technology Beijing 100083 China College of Environmental and Hydraulic Engineering Zhengzhou University Zhengzhou Henan 450002 China Zhengzhou Mining Group Limited Company Zhengzhou Henan 452371 China

Gas outbursts from "three-soft" coal seams (soft roof,soft floor and soft coal) constitute a very serious prob-lem in the Ludian gliding structure area in western Henan. By means of theories and methods of gas geology,structural geology,coal petrology and rock tests,we have discussed the effect of control of several physical properties of soft roof on gas preservation and proposed a new method of forecasting gas geological hazards under open structural conditions. The result shows that the areas with type Ⅲ or Ⅳ soft roofs are the most dangerous areas where gas outburst most likely can take place. Therefore,countermeasures should be taken in these areas to prevent gas outbursts.

关键词： gliding structure tectonite roof gas bursting and pouring prediction of geological gas hazards

Eruption Sequence of the Lower Permanent Dentition of Lufengpithecus lufengensis

在线全文

学校读者我要写书评

暂无评论

人类学学报 2002年第S1期21卷 14-18页

作者： ZHAO ling-xia LU Qing-wu HE Zhu-fang Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of SciencesBeijing 100044China Taiyuan University of Technology Taiyuan 030024China

The paper aims to reconstruct the eruption sequence of the permanent teeth of Lufengpithecus lufengensis. Eruption sequence here means the order of appearance of the tooth crowns out of the alveolar crypt. The permanent dental developments of five juvenile mandibles are observed and analyzed via radiograph. Using such records as the stages of crown and root formation, location of the crown occlusion relative to the alveolar margin, and wear degrees of the erupted teeth, the eruption sequence of the mandibular permanent teeth of Lufengpithecus lufengensis is reasonably derived as M1 I1 I2 M2 P3 P4 C M3. This order is seen to differ very markedly from that in modern humans, and to be similar to that in apes.

关键词： Eruption sequence of mandible dentition Lufengpithecus lufengensis

探讨即效泡沫多酶清洁剂在手术器械预处理中的效果

在线全文

学校读者我要写书评

暂无评论

中国医疗器械信息 2024年第3期30卷 158-161页

作者：包爱琴杨芳蒋蒋陈玲霞广州中医药大学深圳医院(福田)消毒供应中心广东深圳518034

目的:探讨即效泡沫多酶清洁剂对手术器械预处理的效果。方法:选取广州中医药大学深圳医院(福田)消毒供应中心共计2000件复用手术器械,随机分为观察组和对照组,每组各1000件,观察组器械给予即效泡沫多酶清洁剂配套发泡机进行喷洒预处理,... 详细信息

目的:探讨即效泡沫多酶清洁剂对手术器械预处理的效果。方法:选取广州中医药大学深圳医院(福田)消毒供应中心共计2000件复用手术器械,随机分为观察组和对照组,每组各1000件,观察组器械给予即效泡沫多酶清洁剂配套发泡机进行喷洒预处理,对照组器械给予普通多酶清洁剂浸泡预处理,清洗后比较两组清洗合格率、酶溶液的反复浸泡次数对清洗效果的影响、酶溶液的时效性、月均使用量与月均费用。结果:经裸眼目测法评估,观察组的合格率为97.60%,显著高于对照组的合格率93.00%(P<0.05);经5倍带光源放大镜检查,观察组清洗合格率为96.30%,显著高于对照组清洗合格率91.50%(P<0.05);经三磷酸腺苷荧光检测评估,观察组清洗合格率为92.80%,显著高于对照组合格率84.90%(P<0.05);经过统计比较发现,传统多酶清洁剂随着浸泡使用次数增加,清洗效果逐渐下降(P<0.05),月均使用量与月平均费用显著低于对照组(P<0.001)。结论:即效泡沫多酶清洁剂对手术器械预处理后的清洗效果显著优于普通多酶清洁剂的浸泡效果,且成本更低,使用更方便。

关键词：即效泡沫多酶清洁剂普通多酶清洁剂清洗效果成本

Source identification of methane in groundwater in shale gas development areas:A critical review of the state of the art,prospects,and future challenges

在线全文

学校读者我要写书评

暂无评论

Journal of Groundwater Science and Engineering 2021年第3期9卷 245-255页

作者： Zhao-xian Zheng ling-xia Liu xiao-shun Cui Institute ofHydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Key Laboratory of Groundwater Science and Engineering Ministry of Natural ResourcesShijiazhuang 050061China Technology Innovation Center of Geothermal&Hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuang 050061China

The study aims to identify a suitable site for open and bore well in a farmhouseusing ground magnetic survey in south *** also aims to define depth to granitoid and structural elements which traverse the selected *** data(n=84)measured,processed and interpreted as qualitative and *** results of total magnetic intensities indicate that the area is composed of linear magnetic lows trending NE-SW direction and circular to semi-circular causative *** magnetic values ranged from-137 nT to 2345 nT with a mean of 465 *** to equator shows significant shifting of causative bodies in the southern and northern *** signal map shows exact boundary of granitic *** directional filter has brought out structural element trending NE-SW *** of individual profile brought to light structurally weak zone between 90 m and 100 m in all the profile *** decrease of magnetic values from 2042 nT to 126 nT noticed in profile line 6 between 20 m and 30 m indicates fault *** breaks obtained from these maps were visualized,interpreted and identified two suitable sites for open and bore *** averaged power spectrum estimates depth of shallow and deep sources in 5 m and 50 m,*** method has also been applied to estimate depth of granitoid and structural elements using structural indexes 0,1,2,and 3 and found depth ranges from90 *** indicates magnetic method is one of the geophysical methods suitable for groundwater exploration and site selection for open and borewells.

关键词： Noble gas Isotope Source identification of methane Shale gas Groundwater

The influence of intensity and properties of tectonic stress on the process of coalification

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

Journal of Coal Science & Engineering(China) 2012年第2期18卷 158-162页

作者： WANG Zhi-rong JIANG Bo CHEN ling-xia College of Hydraulic and Environmental Engineering Zhengzhou UniversityZhengzhou 450001China

Through the research on stress metamorphism character of the II1 coal seam in Ludian gliding structure, the stress effecting factors of metamorphism and hydrocarbon generation process of tectonic coal were studied. It is shown that different tectonic stress has different coal evolution effects. Compared with tensional stress, compressive stress, which has apparent anisotropic characteristics, has greater stimulative effect against the increase of coal metamorphic degree, the abscission of functional group and side chains of basic structural unit, and the formation of gas primarily composed of methane.

关键词： tectonic stress gliding structure coal metamorphism and hydrocarbon generation process gas geological hazards

CdS/Nb_(2)O_(5)异质结材料的制备、表征及光催化降解环丙沙星研究

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

化学试剂 2024年第3期46卷 49-55页

作者：陈玲霞朱蓓蓓李百裕周杰南通职业大学药品与环境工程学院江苏南通226007

采用水热法制备了CdS/Nb_(2)O_(5)纳米复合材料,利用X-射线衍射光谱(XRD)、透射电镜(TEM)、红外光谱(FT-IR)、X-射线光电子能谱(XPS)和紫外-可见漫反射(UV-Vis DRS)对制备的材料进行表征。通过可见光下降解环丙沙星评价材料的光催化活... 详细信息

采用水热法制备了CdS/Nb_(2)O_(5)纳米复合材料,利用X-射线衍射光谱(XRD)、透射电镜(TEM)、红外光谱(FT-IR)、X-射线光电子能谱(XPS)和紫外-可见漫反射(UV-Vis DRS)对制备的材料进行表征。通过可见光下降解环丙沙星评价材料的光催化活性。结果表明,制备的CdS/Nb_(2)O_(5)纳米复合材料由CdS纳米颗粒分散于Nb_(2)O_(5)纳米笼表面,二者形成紧密的Ⅱ型异质结;CdS的引入增强了Nb_(2)O_(5)的可见光吸收性能,同时提高了光生载流子的分离效率;当CdS的含量为15%时,CdS/Nb_(2)O_(5)可在60 min实现环丙沙星的高效降解,其反应速率常数是CdS的7.5倍,Nb_(2)O_(5)的20倍,空穴是该降解反应的主要活性物种,研究结果为抗生素废水的高效治理提供了一条新思路。

关键词： CdS Nb_(2)O_(5) 异质结光催化环丙沙星

Nickel Release Rate of Several Nickel-containing Stainless Steels for Jewelries

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2015年第1期22卷 72-77页

作者： Jun-ping YUAN Wei LI Chang WANG Chun-yu MA ling-xia CHEN De-dong CHEN Jewelry Institute of Guangzhou Panyu Polytechnic Department of Materials Science and Engineering Jinan University

Nickel-containing stainless steels have been widely applied in watch and jewelry production, and their re- sponses to the Nickel Directive become a universal concern in the industry. The nickel release rates and corrosion be- haviors of types 316L, 304, 303 and 201 stainless steels under the conditions of solid solution and mirror polishing were studied by artificial sweat soaking and electrochemical methods. The results show that the weekly nickel release rates in artificial sweat do not strictly correspond to the nickel contents, which present a descending order as 303 stainless steel of 2.06 μg/cm2 , 201 stainless steel of 1.51 μg/cm2 , 304 stainless steel of 0.08μg/cm2 and 316L stainless steel of 0.02 μg/cm2. Both the nickel release rates of type 303 and 201 stainless steels significantly exceed the threshold values regulated in EN1811 ： 2011 ; therefore, they should be avoided to be used as watch and jewelry materials owing to the risk of nickel sensitization. The nickel release rates of 316L and 304 stainless steels meet the requirements of the standard. Sulfide inclusions in stainless steel become the sources of pitting and exacerbate the damage of the passivation membrane, which is the significant cause to enhance the nickel release rates.

关键词： jewelry nickel-containing stainless steel nickel release rate nickel allergy

Multimodal therapy strategies based on hydrogels for the repair of spinal cord injury

在线全文

学校读者我要写书评

暂无评论

Military Medical Research 2022年第5期9卷 603-617页

作者： Yan Wang Hong-Qian Lv Xuan Chao Wen-Xin Xu Yun Liu Gui-xia ling Peng Zhang Shenyang Pharmaceutical University 103 Wenhua RoadShenyang 110016China Center for Nanotechnology in Drug Delivery Eshelman School of PharmacyUniversity of North Carolina at Chapel HillChapel HillNC 27599USA

Spinal cord injury(SCI)is a serious traumatic disease of the central nervous system,which can give rise to the loss of motor and sensory *** to its complex pathological mechanism,the treatment of this disease still faces a huge *** with good biocompatibility and biodegradability can well imitate the extracellular matrix in the microenvironment of spinal *** have been regarded as promising SCI repair material in recent years and continuous studies have confirmed that hydrogel-based therapy can effectively eliminate inflammation and promote spinal cord repair and regeneration to improve *** this review,hydrogel-based multimodal therapeutic strategies to repair SCI are provided,and a combination of hydrogel scaffolds and other therapeutic modalities are discussed,with particular emphasis on the repair mechanism of SCI.

关键词： Spinal cord injury Injectable hydrogels Hydrogel scaffolds Multimodal therapy

2000—2021年渭河流域NDVI变化及其影响因素

在线全文

学校读者我要写书评

暂无评论

湖北农业科学 2024年第5期63卷 22-29页

作者：封建民刘宇峰郭玲霞文琦咸阳师范学院地理与环境学院陕西咸阳712000 宁夏大学建筑学院银川750021

渭河流域是黄河中游重要的生态涵养地,同时也是黄土高原水土流失的典型区域,监测该地区植被生长变化趋势,并分析其与气候变化和人类活动的关系,对科学评估区域生态建设成效、黄土高原植被恢复和生态修复具有重要意义。基于2000—2021年... 详细信息

渭河流域是黄河中游重要的生态涵养地,同时也是黄土高原水土流失的典型区域,监测该地区植被生长变化趋势,并分析其与气候变化和人类活动的关系,对科学评估区域生态建设成效、黄土高原植被恢复和生态修复具有重要意义。基于2000—2021年归一化植被指数(NDVI)、气温、降水量、人口密度、土地利用数据,分析了渭河流域NDVI的时空变化特征,探究了气候变化和人类活动对NDVI变化趋势的影响。结果表明,2000—2021年,渭河流域植被生长季NDVI呈增加趋势,全区年平均增速为0.004。年际尺度上,NDVI与年平均降水量呈正相关关系,与年平均气温的相关性不显著;月尺度上,NDVI与4月和8月的气温、降水量均呈正相关关系,与7月气温呈弱的负相关关系。人口密度变化与NDVI变化趋势呈负相关,流域人口密度的减小有利于植被的恢复和改善。土地利用类型内部变化是植被NDVI变化的主要原因。NDVI显著减少区NDVI的减少趋势主要由关中平原耕地NDVI的减少引起,NDVI显著增加区NDVI的增加趋势主要由草地、林地以及黄土丘陵区、黄土残塬区耕地NDVI的增加引起。

关键词：归一化植被指数(NDVI) 气候人口密度土地利用渭河流域