检索结果-南通市图书馆

Risk-based evaluation on geological environment carrying capacity of mountain city - A case study in Suide County, Shaanxi Province, China

引用

Journal of Mountain Science 2018年第12期15卷 2730-2740页

作者： WANGYao zhang mao-sheng XUE Qiang WU Si-duo Development Research Center of China Geological Survey Beijing 100037China Xi'an Center of Geological Survey China Geological SurveyXi'an jiooooChina East China Normal University Shanghai 200062China

With the rapid development and expansion of the cities in China, the carrying capacity of resource and environment has become a huge concern for local governments. From the perspective of geological environment, geological disasters are the main restraining factor of the development in mountain cities. This study was conducted in Suide County of Shaanxi Province with a risk-based approach as followed: a hazard analysis on geological disasters based on a slope geological survey at a scale of 1:10,000; a consequence analysis based on unmanned aerial vehicle(UAV) aerial survey data; integrating the results of hazard analysis and consequence analysis, a risk zonation and analysis of geological disasters in urban areas were completed considering urban planning, land use planning and the safety of infrastructure and major engineering. Subsequently, taking the acceptable levels of human life and property risks incurred by landslides as the criteria of the evaluation of geological environment carrying capacity, a comprehensive assessment of current and future urban carrying capacity was conducted based on the results of the risk analyses. Accordingly, the prior development zone, the restricted development zone and the prohibited zone were delineated, with corresponding suggestions for future urban development. The technological and methodological system used in the study can be applied to geological environment carrying capacity evaluation of other important mountain cities, which can provide scientific basis for the optimization of land and space.

关键词： Mountain cities Risks Geological environment Carrying capacity Evaluation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Resistivity is used as a tool to evaluate the variability of soil water content

引用

Journal of Mountain Science 2022年第12期19卷 3533-3547页

作者： zhang Bin zhang mao-sheng SUN Ping-ping LIU Hao FENG Li College of Geological Engineering and Geomatics Chang'an UniversityXi'an 710054China School of Human Settlements and Civil Engineering Xi'an Jiaotong UniversityXi'an 710049China Key Laboratory for Geohazard in Loess Area Ministry of Natural ResourcesXi'an Center of China Geological SurveyXi'an 710054China

Resistivity is used to evaluate soil water content(SWC),which has the advantages of not causing soil disturbance and in low *** is an effective way to assess the SWC *** paper aims to evaluate the variability of loess slope SWC through the change of *** provides a simple way for long term SWC monitoring to solve the expensive cost of deploying moisture *** this context,geoelectric and environmental factors such as soil temperature and SWC were monitored for three *** prediction model of apparent resistivity and SWC was *** post processing of geoelectric data was *** addition,the SWC collected by Time-Domain Reflectometry(TDR)was used to verify the feasibility of electrical resistivity tomography(ERT)*** SWC variability in the process of rainfall,the evolution of four seasons,and the alternation of drying and wetting were *** research results show that:i)the SWC monitored by ERT and TDR can reflect the response and hysteretic effect of water content at 0.5-3.0 m ***)The moisture content monitored by ERT reflects that the soil is relatively wet in summer and autumn and dry in winter and ***)From 2017 to 2020,the SWC increased in August,and the soil became dry in ***)Two areas with high SWC and three areas with low SWC on loess slope are reflected by *** outcome can provide the change information of SWC to a great extent without excavating boreholes.

关键词： Loess slope Rainfall Prediction model Moisture variability Apparent resistivity Soil water content

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

鞘内输注氢吗啡酮与其联合氯胺酮和加巴喷丁治疗难治性癌痛的效果分析

引用

临床药物治疗杂志 2024年第3期22卷 43-49页

作者：李娜李敏杨利珍张生茂呼和浩特市第一医院疼痛科呼和浩特010017 内蒙古自治区人民医院麻醉科呼和浩特010017

目的探讨鞘内连续输注吗啡、氢吗啡酮以及氢吗啡酮联合氯胺酮和加巴喷丁治疗难治性癌痛鼻咽癌患者的疗效和不良反应。方法选取2022年1—6月呼和浩特市第一医院接受治疗的伴有难治性癌痛晚期鼻咽癌患者并进行随机分组。吗啡组(M组)接受... 详细信息

目的探讨鞘内连续输注吗啡、氢吗啡酮以及氢吗啡酮联合氯胺酮和加巴喷丁治疗难治性癌痛鼻咽癌患者的疗效和不良反应。方法选取2022年1—6月呼和浩特市第一医院接受治疗的伴有难治性癌痛晚期鼻咽癌患者并进行随机分组。吗啡组(M组)接受鞘内连续输注吗啡治疗;氢吗啡酮组(HM组)接受鞘内连续输注氢吗啡酮治疗;氢吗啡酮+氯胺酮组(HM+KET组)接受鞘内连续输注氢吗啡酮联合静脉输注氯胺酮治疗;氢吗啡酮+氯胺酮+加巴喷丁组(HM+KET+GBP组)接受鞘内连续输注氢吗啡酮联合静脉输注氯胺酮和口服加巴喷丁治疗。持续记录并比较不同药物治疗组患者的疼痛数字评分法(NRS)评分、24 h内爆发性癌痛次数、匹兹堡睡眠质量指数(PSQI)评分、不良反应以及生存状况。结果共纳入204例患者,男149例(73.0%),女55例(27.0%)患者,平均年龄为(45.8±9.9)岁。其中M组101例,HM组34例,HM+KET组34例,HM+KET+GBP组35例,各组患者临床症状、血液参数和病理类型资料比较,差异均无统计学意义(P>0.05)。治疗前,各组NRS评分、24 h内爆发性癌痛次数和PSQI评分比较,差异均无统计学意义(P>0.05);HM组患者治疗后所有时点的NRS评分、PSQI评分显著低于M组,24 h内暴发性疼痛次数少于M组患者;HM+KET+GBP组患者治疗后1 d、3 d、7 d、15 d和1个月的NRS评分低于HM组和HM+KET组,治疗后所有时点24 h内暴发性疼痛次数少于HM组和HM+KET组,治疗后1个月和2个月的PSQI评分低于HM组和HM+KET组,差异均有统计学意义(P<0.05)。安全性分析显示,HM组患者的便秘发生率低于M组,HM+KET+GBP组患者恶心呕吐、便秘、嗜睡和皮肤瘙痒发生率均低于HM组和HM+KET组,差异有统计学意义(P<0.05)。生存分析显示,HM组比M组的患者具有更长的总生存期(P=0.042)。结论鞘内输注氢吗啡酮治疗难治性癌痛鼻咽癌患者有较大优势,且氢吗啡酮联合氯胺酮和加巴喷丁疗效更好。

关键词：氢吗啡酮难治性疼痛鼻咽癌疗效不良反应总生存期

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Failure mechanisms and risk mitigation of check dams on the Chinese Loess Plateau: A case study at the Gutun Gully

引用

Journal of Mountain Science 2022年第6期19卷 1509-1524页

作者： JIANG Rui-jun zhang mao-sheng FENG Li SUN Ping-ping Department of Geological Engineering Chang’an UniversityXi’anShaanxi 710054China Department of Civil Engineering School of Human Settlements and Civil EngineeringXi’an Jiaotong UniversityXi'an 710049China Key Laboratory for Geo-hazards in Loess Area Ministry of Natural ResourcesXi’an Center of China Geological SurveyXi’an 710054China

Loess is long-term aeolian dust deposition, characterized by loose structure, concentrated participle distribution and unstable mineral composition, and thus easy to cause extensive collapsibility and have general water sensitivity. To reveal the difference in water sensitivity between naturally intact(NI) loess and mechanically compacted(MC) loess used for the check dam, the transient water release and imbibition method(TRIM) was used to acquire the suction stress–expanded hydraulic characteristic curves for the NI and MC loess and explore possible approaches for formulating the potential of loess water sensitivity. Based on the Local Field of Safety(LFS) associated with slope stability, we constructed a finite element model of a check dam to depict its failure processes under different rainfall scenarios. The results revealed the strong water sensitivity in NI loess, while the MC loess retained a certain water-sensitive potential. This capacity depends on the ‘water sensitivity coefficient’ obtained from the suction-stress characteristic curve,which better presented the deformation potential of the two loess samples at different water content levels. In the context of LFS, we identified two failure patterns in the dam body that were involved in loess water sensitivity under hydromechanical conditions: rainfall erosion-induced shallow mudflow failure, and preferential-infiltration progressive failure. These patterns may provide new insights into dam-breakage mechanisms and potential chain effects of check dams on the Chinese Loess Plateau from the perspective of soil–water interactions, which is vital for predicting the position and timing of check dam failure, and mitigating risks.

关键词： Chinese loess Water sensitivity Suction stress Failure patterns Slope stability Check dam

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Assessment of landslide susceptibility using DBSCAN-AHD and LD-EV methods

引用

Journal of Mountain Science 2022年第1期19卷 184-197页

作者： mao Yi-min MWAKAPESA Deborah S LI Yi-can XU Kai-bin NANEHKARAN Yaser A zhang mao-sheng School of Information Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Key Laboratory for Geo-hazards in Loess Area Xi’an 710054China Northwest Nonferrous Geological Mining Group Limited Company Xi’an 710054China

Landslide susceptibility assessment plays a vital role in understanding landslide information in advance and taking preventive as well as control measures. The need to initially specify the number of clusters, difficulty in handling noise and quantifying rainfall data, limits the application of traditional clustering models in landslide susceptibility assessment which then lowers their performance accuracy. Thus, to overcome these limitations, this study proposed an improved clustering algorithm titled the DBSCAN-AHD algorithm, which combines the traditional DBSCAN(Density Based Spatial Clustering of Application with Noise) algorithm and an Adaptive Hausdorff Distance(AHD) for landslide susceptibility modeling. Firstly, AHD was introduced to the traditional DBSCAN to quantify rainfall. Then,the DBSCAN-AHD grouped the mapping units with similar topology and geology characteristics into subclasses without specifying the number of clusters in advance for its ability to handle noise in the ***, the LD-EV(landslide density or eigenvalues) approach was introduced to obtain the susceptibility levels using K-means algorithm. Finally,to verify the model’s performance, statistical indices and the area under the curve(AUC) were applied and compared to the traditional DBSCAN, KPSO, Kmeans and Hierarchical Clustering algorithms,whereby, the proposed model outperformed the others. Also, the obtained susceptibility map can provide references in taking relevant preventive and control measures.

关键词： Landslide susceptibility DBSCAN Machine learning algorithm Uncertain data Clustering algorithm

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Collapse behavior and microstructural evolution of loess soils from the Loess Plateau of China

引用

Journal of Mountain Science 2018年第8期15卷 1642-1657页

作者： XIE Wan-li LI Ping zhang mao-sheng CHENG Tian-e WANG Yong State Key Laboratory of Continental Dynamics Northwest University Department of Geology Northwest University Key Laboratory for Geo-hazard in Loess Area Ministry of Land and ResourcesXi'an Center of China Geological Survey College of Urban and Environmental Sciences School of Foreign Languages Northwest University

Loess soils are characterized by metastable microstructure, high porosity and water-sensitivity. These soils have always been problematic soils and attracted attention from researchers all over the world. In the present study, three loess soils extracted at various depths from the Loess Plateau of China, i.e. Malan(Q_3), upper Lishi(Q_2~2) and lower Lishi(Q_2~1) loess soils, were studied. Single oedometer-collapse tests were performed on intact loess specimens to investigate the collapse behavior of three loess soils. The microstructure and chemical composition of each loess before and after collapse test were characterized using scanning electron microscopy(i.e. SEM) and energy dispersive spectroscopy(i.e. EDS) techniques. The microstructural evolution due to wetting collapse was interpreted qualitatively and quantitatively in terms of the pore morphology properties. The results suggest that:(1) the collapse potential of each loess may rise again after a round of rise and drop, which could be failure of the new-developed stable structure under quite high vertical pressure. It implies that loess may collapse even if it has collapsed.(2) Q_3, Q_2~2 and Q_2~1 loess have different types of microstructure, namely, granule, aggregate and matrix type of microstructure, respectively.(3) The microstructural evolution due to loading and wetting is observed from a granule type to an aggregate type and finally to a matrix type of structure. The variations in distributions of pore morphology properties indicate that collapse leads to a transformation of large-sized pores into small-sized pores, re-orientation and remolding of soil pores due to particle rearrangement.(4) A porous structure is essential for loess collapse; however, the non-water-stability of bonding agents promotes the occurrence of collapse under the coupling effect of loading and wetting.

关键词： Loess Collapse Microstructure Scanning electron microscopy Image processing Pore morphology properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Liquid-liquid Microextraction Based on Solidification of Floating Organic Drops Coupled with Gas Chromatography for Analyzing Trace Benzene, Toluene and Xylene in Water Samples

引用

Chemical Research in Chinese Universities 2011年第6期27卷 939-943页

作者： zhang mao-sheng HUANG Jia-rong ZHENG Xiang-hua XIE Qiong-fang Department of Chemistry and Environmental Science Zhangzhou Normal University Zhangzhou 363000 P. R. China zhangzhou Entry-Exit Inspection and Quarantine Bureau Zhangzhou 363000 P. R. China Inspection and Quarantine Technical Center Xiamen Entry-Exit Inspection and Quarantine Bureau Xiamen 361012 P. R. China

A new liquid-liquid microextraction method based on the solidification of floating organic drops coupled with gas chromatography was developed for the determination of trace benzene, toluene and xylene（BTX） in water samples. In the microextraction procedure, a microdrop of n-decanol was delivered to the surface of the analytes’ solution, and stirred for a desired time. Following the absolute extraction, the sample vial was cooled in an ice bath for 10 min. The solidified n-decanol was then transferred into a plastic tube and melted naturally; and 1 μL of it was injected into gas chromatography for analysis. Factors relevant to the extraction efficiency were studied and optimized. The optimal experimental conditions were： 15 μL of n-decanol as extractive solvent, 30 mL of solution containing analytes, no salt, the stirring rate 400 r/min, the extraction temperature 30 °C, and the extraction time 30 min. Under those optimized conditions, the detection limit（LOD） of analytes was in a range of 0.05―0.10 ng/mL by the developed method. A good linearity（r0.99） in a calibration range of 0.01―100 μg/mL was obtained. The recoveries of the real samples at different spiked levels of BTX were in the range from 92.2% to 103.4%.

关键词： Gas chromatography Liquid-liquid microextraction Solidified floating organic drop n-Decanol

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

硼酸酯润滑油添加剂的设计、制备及在齿轮油中的应用研究

引用

润滑油 2024年第2期39卷 16-22,28页

作者：杨汐杨广彬张晟卯张玉娟张平余河南大学纳米材料工程研究中心河南开封475004

为了进一步提高齿轮油CKD 320的摩擦学性能,设计、制备了3种带有不同官能团的绿色环保含硼添加剂:饱和碳链的硬脂酸二乙醇酰胺硼酸酯(C18)、带有C=C双键的油酸二乙醇酰胺硼酸酯(C18∶1)和带有极性基团羟基和双键的蓖麻油酸二乙醇酰胺硼... 详细信息

为了进一步提高齿轮油CKD 320的摩擦学性能,设计、制备了3种带有不同官能团的绿色环保含硼添加剂:饱和碳链的硬脂酸二乙醇酰胺硼酸酯(C18)、带有C=C双键的油酸二乙醇酰胺硼酸酯(C18∶1)和带有极性基团羟基和双键的蓖麻油酸二乙醇酰胺硼酸酯(C18∶1OH)。通过调控硼酸酯润滑油添加剂的极性,研究硼酸酯的极性对齿轮油CKD 320摩擦学性能的影响。结果表明:3种硼酸酯添加剂可以在不改变齿轮油CKD 320理化性能的情况下,提高齿轮油的减摩和抗磨性能以及承载能力,硼酸酯的极性越强,越易在摩擦表面吸附,抗磨性越高。

关键词：硼酸酯不同官能团极性添加剂齿轮油摩擦学性能

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis of SSRs Information in Capsicum spp. from EST Database

引用

Agricultural Sciences in China 2011年第10期10卷 1532-1536页

作者： HUANG Huan-huan zhang Zhong-hua zhang Zheng-hai mao sheng-li WANG Li-hao zhangBao-xi Key Laboratory of Vegetable Genetics and Physiology Ministry of Agriculture~Institute of Vegetables and Flowers Chinese Academy ofAgricultural Sciences Beijing 100081 P.R. China

SSR markers are useful in pepper linkage mapping and gene location. 446 SSR markers have been reported, but they are insufficient. It is costly to develop SSR markers from DNA library, whereas it seems much easy to find in EST sequences in the GenBank of pepper through internet. In this study, attempts have been made to develop SSR markers in the EST sequences by using bioinformatics. EST sequences were trimmed by ‘***’ software, while 116 915 EST sequences were obtained without poly ‘A’ or poly ‘T’, ranged between 100 and 700 bp. Using ‘e-PCR’ and ‘***’ softwares, SSR sequences were identified. 2 508 microsatellite loci （larger than 20 repeats） were established and 755 SSR primers were designed using SSR finder software and Primer 3 software. There were 498 （0.43%） mono-, 1 026 （0.89%） di-, 518 （0.45%） tri-, 245 （0.21%） tetra-, 114 （0.10%） penta-, and 107 （0.09%） hexa-nucleotide SSRs. The estimated frequency of SSRs was approximately 1/25.12 kb. According to the distribution of SSRs in pepper, the mean length of pepper SSRs was 22.68 bp and the adenine rich repeats such as A/T, AG, AT, AAG, AAAT, and AAAC were predominant in each type of SSRs （mono-, di-, tri-, tetra-, penta-, and hexa-）, whereas the C/G, CG, CCG repeats were less abundant. 210 primers were tested in 8 pepper cultivars and the PCR result revealed the existence of polymorphism among 127 （60.48%） SSR primers within 8 pepper cultivars. It is confirmed that pepper EST database could be efficiently exploited for availability of SSR markers.

关键词： pepper expressed sequence tags microsatellite bioinformatics e-PCR

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

过表达NOLC1诱导人非小细胞肺癌细胞凋亡

引用

微生物学杂志 2024年第2期44卷 87-96页

作者：杜亚兰张茂盛王旌羽张璐燕周常博佘晓双郑方亮朱春玉辽宁大学生命科学学院辽宁沈阳110000 秦皇岛市海港医院河北秦皇岛066000 宁阳县第一人民医院山东泰安271000

人核仁磷酸化蛋白1(Nucleolar and coiledbody phosphoprotein 1,NOLC1)在癌症的发生发展过程中起着至关重要的调控作用,为探讨NOLC1对肺癌细胞的作用,本研究通过Gateway系统构建重组NOLC1腺病毒载体,成功包装NOLC1腺病毒后,分别感染正... 详细信息

人核仁磷酸化蛋白1(Nucleolar and coiledbody phosphoprotein 1,NOLC1)在癌症的发生发展过程中起着至关重要的调控作用,为探讨NOLC1对肺癌细胞的作用,本研究通过Gateway系统构建重组NOLC1腺病毒载体,成功包装NOLC1腺病毒后,分别感染正常人类胚胎肺细胞(HEL)和非小细胞肺癌细胞(A549细胞),过表达NOLC1。通过MTT实验、AnnexinV-APC/PI双染法和线粒体膜电位实验,证明与HEL细胞相比,NOLC1的过表达对A549细胞的活性降低、凋亡增加、线粒体膜电位下降影响较为显著;通过Real-time PCR检测Caspase家族、TNF与受体家族和BCL2家族基因的表达,发现过表达NOLC1明显上调了A549细胞中促凋亡基因的表达,下调了抗凋亡基因的表达,其中两种重要的促凋亡蛋白CASP8和BAX均显著上调,但是在HEL细胞中这种影响不明显。研究结果表明过表达NOLC1蛋白通过对线粒体通路和死亡受体通路的共同作用,对非小细胞癌具有显著的抗肿瘤活性。

关键词： NOLC1(Nucleolar and coiledbody phosphoprotein 1) 肺癌细胞腺病毒载体过表达细胞凋亡

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：