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面向期刊评价的s指数构造及实例研究
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作者 朱雯 陈荣 刘颖 《中国科技期刊研究》 CSSCI 北大核心 2019年第2期189-196,共8页
【目的】探讨基于被引频次的sc指数和基于下载频次的sd指数在多学科期刊评价中的应用情况。【方法】利用中国知网数据库,以2011-2015年理、工、农、医、社会科学五大学科期刊的下载频次和被引频次为基础,构造期刊sd指数与sc指数,比较201... 【目的】探讨基于被引频次的sc指数和基于下载频次的sd指数在多学科期刊评价中的应用情况。【方法】利用中国知网数据库,以2011-2015年理、工、农、医、社会科学五大学科期刊的下载频次和被引频次为基础,构造期刊sd指数与sc指数,比较2011-2015年不同学科样本期刊的sd指数、sc指数的相关性变化情况以及与其他期刊评价指标的关系。【结果】与h指数相比,s指数更适合综合评价期刊的影响力;2011-2015年理、工、农、医学科样本期刊的sd指数、sc指数相关性高于社会科学,各学科在2013年和2014年相关系数波动较大;除社会科学学科外,2011-2015年其余学科样本期刊的sd指数、sc指数与其他期刊评价指标的相关性相差不大。【结论】s指数作为期刊评价指标具有一定的合理性;在期刊评价中需要考虑不同时间、不同学科期刊的下载频次和被引频次的关系。 展开更多
关键词 s指数 H指数 G指数 r指数 期刊评价
Use of the average age ratio method in analyzing age heaping in censuses:The case of China 预览
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作者 Danan Gu Qiushi Feng 《国际人口学期刊》 2019年第1期13-26,共14页
Based on the methods of the average period age ratio and the average cohort age ratio,this study systematically assesses age heaping or digit preference in all population censuses of China.Our study finds that the ove... Based on the methods of the average period age ratio and the average cohort age ratio,this study systematically assesses age heaping or digit preference in all population censuses of China.Our study finds that the overall age heaping was relatively low in the Chinese censuses;however,there was a notable preference for ages ending with zero after age 50 in the first two censuses,despite a weakening trend over time.Our study further shows that age heaping in China’s censuses is likely associated with age-related policies such as those on late marriage and retirement.As shown in the study,the average age ratio method can be an alternative of the Whipple’s Index and be improved if the size of birth cohort was taken into account when the number of births is generally reliable. 展开更多
关键词 Age concentration INDEX Age heaping age RATIO Age reporting AVERAGE age RATIO AVERAGE period age RATIO AVERAGE cohort age RATIO China CENSUS DIGIT preference DIGIT AVOIDANCE Whipple’s INDEX Myer’s blended INDEX
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Assessing the oscillation of channel geometry and meander migration cardinality of Bhagirathi River,West Bengal,India
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作者 Rakhohori Bag Ismail Mondal Jatisankar Bandyopadhyay 《地理学报:英文版》 SCIE CSCD 2019年第4期613-634,共22页
Lateral migration of the Bhagirathi River temporally creates unavoidable geomorphic hazards in West Bengal,India.The Bhagirathi River flows SW for-67.30 km betwee n the confluenee point of Ajay and Jalangi rivers in E... Lateral migration of the Bhagirathi River temporally creates unavoidable geomorphic hazards in West Bengal,India.The Bhagirathi River flows SW for-67.30 km betwee n the confluenee point of Ajay and Jalangi rivers in East Burdwan and Nadia districts of West Bengal.The course of Bhagirathi is notably migration prone and cultivates problematic changes along its course over time.In the study,we have looked into its migration tendency and unpredictability for past 238 years and then predicted the lateral shifting of river centerline using temporal satellite imageries-Landsat-5(TM)of 1987(8,December),1995(28,January),2005(7,January)and LISS-IV satellite imagery(2017,5 January);SOI Toposheet-1968-1969(79A/2,79A/3,79A/6 and 79A/7)and RennelPs map of 1779.Other highlights are the quest of fluvial features,oxbow lakes,mid-channel bars,channel migration rate,meander geometry,channel sinuosity in different parts of river course and the parts that experience intensive bank erosion.The entire river course has been subdivided into three segments;viz.reaches A,B and C.Investigation displays that degree of sinuosity decreases from its anterior course(1968)to the existing course(2017).Reach-specific outputs display that reach B is highly sinuous(SI value 1.94 in 2017)and SI increases temporarily,whereas for reaches A and C it decreases with time.The rate of migration is higher in reach B than that in reaches C and A.The study displays a notably decreasing trend of migration in comparison with its previous lateral migration and shows that the migration nature over time is intensively inconsistent and unpredictable except very few portions of the river course.The nature of deposition within the river channel shows an unstable behavior during the entire period of the study.Meander geometry depicts a rapid change of river course innate to meander bends and shows a higher rate of migration by meander loop cut-off rather than lateral migration that reflects the inconsistency,erosion vulnerability and unpredictable nature of migration.Th 展开更多
关键词 channel GEOMETRY sinuosity INDEX BRAIDING INDEX MEANDER GEOMETRY radius of curvature bend TIGHTNESS INDEX linear regression GIS
Wiener Index, Hyper-Wiener Index, Harary Index and Hamiltonicity Properties of graphs 预览
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作者 YU Gui-dong REN Li-fang LI Xing-xing 《高校应用数学学报:英文版(B辑)》 SCIE CSCD 2019年第2期162-172,共11页
In this paper, in terms of Wiener index, hyper-Wiener index and Harary index, we first give some sufficient conditions for a nearly balance bipartite graph with given minimum degree to be traceable. Secondly, we estab... In this paper, in terms of Wiener index, hyper-Wiener index and Harary index, we first give some sufficient conditions for a nearly balance bipartite graph with given minimum degree to be traceable. Secondly, we establish some conditions for a k-connected graph to be Hamilton-connected and traceable for every vertex, respectively. 展开更多
关键词 WIENER INDEX Hyper-Wiener INDEX Harary INDEX TRACEABLE Hamilton-connected TRACEABLE for EVERY VERTEX
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钛冶金数据库条目性能优化设计研究 预览
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作者 马力 唐晓宁 +2 位作者 贺韬 谢刚 张彬 《矿冶》 CAS 2019年第1期50-53,共4页
钛冶金数据库是基于传统数据库软件开发的,其中最重要的一部分就是各种钛冶金数据的数学计算模型。钛化合物的热力学计算数据存储形式复杂、计算过程繁琐,查询和分析计算速度都受到数据库性能的影响。为此把数据库索引建立在基础数据库... 钛冶金数据库是基于传统数据库软件开发的,其中最重要的一部分就是各种钛冶金数据的数学计算模型。钛化合物的热力学计算数据存储形式复杂、计算过程繁琐,查询和分析计算速度都受到数据库性能的影响。为此把数据库索引建立在基础数据库上,成为索引数据库,使数据索引单独存放在该数据库中。索引数据库可以按照经济性能的比较,规划成标准大小的索引数据库,新增数据根据自身数据特点形成新的索引加入到索引数据库中,这样就利用已有数据库的处理能力对条目性能进行了优化,大大提高了钛冶金数据库的数据检索效率。 展开更多
关键词 钛冶金数据库 数据条目 索引 索引数据库 索引生产
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1961—2016年祁连山区季节性干旱综合指数特征分析 预览
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作者 郭小芹 罗永忠 《气象与环境学报》 2019年第1期88-93,共6页
采用Z指数和熵权理论,构建了干旱综合指数作为干旱强度评价标准,对祁连山区季节性干旱特征及其空间分布规律进行了深入剖析。结果表明:1961—2016年季节性干旱强度普遍减弱,其中春秋两季显著减弱,夏季明显减弱;尽管20世纪60—70年代、9... 采用Z指数和熵权理论,构建了干旱综合指数作为干旱强度评价标准,对祁连山区季节性干旱特征及其空间分布规律进行了深入剖析。结果表明:1961—2016年季节性干旱强度普遍减弱,其中春秋两季显著减弱,夏季明显减弱;尽管20世纪60—70年代、90年代为季节性干旱频发与重发时段,但从2000年以来夏旱与冬旱却比较频繁,不容忽视。干旱强度由强到弱依次为冬季、夏季、春季和秋季,冬季干旱程度最强;在干旱波动性上秋季最强,冬季次之,春季最弱。春夏秋三季南侧比北侧干旱,冬季北侧比南侧干旱,其中冬季干旱范围最为广泛,尤以酒泉为中心的北侧区域最为显著。在研究时段内祁连山南北两侧干旱强度逐渐减弱,南侧明显减弱,枯草期干旱强度减弱程度尤为显著。本研究为祁连山区干旱评价提供了参考依据。 展开更多
关键词 Z指数 熵权赋值 干旱综合指数 季节性干旱
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Remote Sensing Monitoring of Surface Characteristics in the Badain Jaran, Tengger, and Ulan Buh Deserts of China 预览
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作者 LIU Qingsheng LIU Gaohuan +1 位作者 HUANG Chong LI He 《中国地理科学:英文版》 SCIE CSCD 2019年第1期151-165,共15页
Deserts and sandy land in northern China are very susceptible to sandy desertification and are the main source of sand-dust storms of Asian dust. However, because of the complex factors involved, descriptions of the r... Deserts and sandy land in northern China are very susceptible to sandy desertification and are the main source of sand-dust storms of Asian dust. However, because of the complex factors involved, descriptions of the relationship between sandy desertification and surface characteristics in these regions are lacking. We monitored the surface characteristics and their changes in time using information about soil, vegetation, and landforms in the Badain Jaran Desert(BJD), Tengger Desert(TD), and Ulan Buh Desert(UBD) in the northern China. The monitoring was done using tasseled cap angle(TCA), disturbance index(DI), and topsoil grain size index(TGSI) from Moderate Resolution Imaging Spectroradiometer(MODIS) images combined with a decision tree classification. Results showed that the TD had higher topsoil fine sand content, and the ratio of non-vegetated to vegetated areas was similar with that in the UBD. Northeast-southwest coarse sand dunes with thin interdune(NECTI) dominated the BD, fine sand dunes(FSD) dominated the TD, and a combination of northeast-southwest coarse sand dunes with wide interdune(NECWI) and northwest-southeast coarse sand dunes with wide interdune(NWCWI) dominated the UBD. From 2000 to 2015, in the BJD the area of the NECTI, non-sand dune(Non) and potential sand sources(PSS) increased, whereas the area of the NECWI, FSD and NWCWI decreased, indicating a improve process in the BJD. In the TD, the area covered by Non increased, whereas the area covered by PSS, NECWI, NECTI, FSD, and NWCWI decreased from 2000 to 2015. The area covered by the various surface characteristic types fluctuated annually in the UBD from 2000 to 2015. Changes in surface characteristics reflect the combined effects of natural conditions and human activity. The findings of our study will assist scientists and policy makers in proposing different management techniques to combat sandy desertification for the different surface characteristics of these regions. 展开更多
关键词 surface characteristics MODIS DESERT tasseled CAP angle DISTURBANCE INDEX TOPSOIL GRAIN size INDEX
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Durability classification of red beds rocks in central Yunnan based on particle size distribution and slaking procedure
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作者 ZHU Jun-jie DENG Hui 《山地科学学报:英文版》 SCIE CSCD 2019年第3期714-724,共11页
Moisture induced disintegration of soft rock in Red Beds is common all over the world. The slake durability index test is most useful to quantify durability of the soft rocks. Based on a series of slaking test, this a... Moisture induced disintegration of soft rock in Red Beds is common all over the world. The slake durability index test is most useful to quantify durability of the soft rocks. Based on a series of slaking test, this article aims to develop a durability classification involving particle size and slaking procedure. To describe the slaking procedure in detail,the Relative Slake Durability Index(Idi) is proposed. The Idi is the percentage ratio of the ith weight of oven-dry retained portion to the(i-1)th weight of ovendry retained portion. Results show that the Idi of samples have a large difference in certain slaking procedure, whereas the traditional Durability Slake Index(Id) is almost constant. Considering this limitation of Id in durability classification, an advanced classification by applying the Idi and disintegration ratio(DR) is further established in this article. Compared to the durability classification based on Slake Durability Index(Id), the new classification accounts for the particle size of the slaked material and the slaking procedure, so it provides a better measure of the degree of slaking. The classification recommended in this article divide the slake durability into three classes(i.e., low, medium and high class). Furthermore, it divides both the low class and the medium class into 3 subclasses. 展开更多
关键词 Slaking test DURABILITY CLASSIFICATION RELATIVE DURABILITY INDEX DURABILITY INDEX Disintegrate rate
Effects of Raspberry Root decoction on cytokine level and thymus and spleen index in S180 model mice
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作者 Yu-Zhen Sun Yi Fang +1 位作者 Xiao-Hong Yu Pei-Yu Yan 《海南医科大学学报(英文版)》 2019年第10期15-18,共4页
Objective: To observe the effects of RRD on serum levels of cytokines interleukin-2 (IL-2), interleukin-10 (IL-10) and thymus and spleen index in S180 mice, and to explore the mechanism of tumor inhibition by RRD. Met... Objective: To observe the effects of RRD on serum levels of cytokines interleukin-2 (IL-2), interleukin-10 (IL-10) and thymus and spleen index in S180 mice, and to explore the mechanism of tumor inhibition by RRD. Methods: Fifty Kunming healthy mice, half male and half female, were randomly divided into five groups: normal control group, model control group, cyclophosphamide group (CTX group), red raspberry group (RRD group) and combined administration of red raspberry and cyclophosphamide group (RRD + CTX group), with 10 mice in each group only. The other 40 mice were injected with 0.2 mLS180 tumor suspension at the right axilla to make the model experiment, except 10 mice in the normal control group. The next day, the normal control group and model control group were given intragastric administration of 0.02 mL/g/d saline, CTX group was given intragastric administration of 0.4 mL/20 g/d saline and 20 mg/kg/d CTX, RRD group was given intragastric administration of 0.4 mL/20 g/d RRD, RRD+CTX group was given intragastric administration of 0.4 mL/20 g/d RRD and 20 mg/kg/d CTX for 10 d, once a day. Serum levels of IL-2 and IL-10 were measured by ELISA, and thymus and spleen indexes were measured. Results: Red raspberry rhizome decoction could increase serum IL-2 level (P < 0.05), decrease IL-10 level (P < 0.05), increase thymus index (P < 0.05) and decrease spleen index (P < 0.05) in S180 mice. Conclusion:The anti-tumor effect of the water decoction of red raspberry rhizome may be related to the regulation of immune suppression and the improvement of immune organ function of the tumor-bearing organism. 展开更多
关键词 RASPBERRY ROOT DECOCTION S180 model mice IL-2 IL-10 Thymus INDEX Spleen INDEX
土地整理项目重估指标体系研究——以烟台市牟平区为例 预览
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作者 张贵军 姜凌燕 夏艳玲 《科学技术创新》 2019年第23期5-6,共2页
本文针对烟台市牟平区土地整理项目实际情况,采用多因素综合评定法对整理后项目区土地进行质量评价,构建土地质量重估评价指标体系,并应用AHP法进行指标权重的确定,以保证评价结果的科学性,为该地区土地整理项目土地质量评价提供支持。
关键词 土地整理 重估 指标 权重
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Blessing and a curse of outpatient management of delayed graft function 预览
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作者 Justin W Blazel Jennifer A Turk +1 位作者 Brenda L Muth Sandesh Parajuli 《世界移植杂志》 2019年第4期58-61,共4页
Delayed graft function (DGF) is a common complication occurring most often after deceased donor kidney transplant with several donor characteristics as well as immunologic factors that lead to its development post-tra... Delayed graft function (DGF) is a common complication occurring most often after deceased donor kidney transplant with several donor characteristics as well as immunologic factors that lead to its development post-transplant.These patients require dialysis and close kidney function monitoring until sufficient allograft function is achieved.This has resulted in limited options for DGF management,either prolonged hospitalization until graft function improves to the point where dialysis is no longer needed or discharge back to their home dialysis unit with periodic follow up in the transplant clinic.DGF is associated with a higher risk for acute rejection,premature graft failure,and 30-d readmission;therefore,these patients need close monitoring,immunosuppression management,and prompt allograft biopsy if prolonged DGF is observed.This may not occur if these patients are discharged back to their home dialysis unit.To address this issue,the University of Wisconsin-Madison created a clinic in 2011 specialized in outpatient DGF management.This clinic was able to successfully reduce hospital length of stay without an increase in 30-d readmission,graft loss,and patient death. 展开更多
关键词 Delayed graft function KIDNEY transplantation IMMUNOSUPPRESSION Acute rejection KIDNEY DONOR profile INDEX KIDNEY DONOR risk INDEX Dialysis
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Study on the Difference of Body Mass Index and Insulin Sensitivity Index in Salt-sensitive Hypertension Patients of Different Traditional Chinese Medicine Syndrome Types 预览
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作者 褚瑜光 胡元会 《世界中西医结合杂志(英文)》 2019年第2期20-25,共6页
OBJECTIVE: To explore the difference of body mass index(BMI) and insulin sensitivity index(ISI) in saltsensitive hypertension patients of different traditional Chinese medicine(TCM) syndrome types, so as to elucidate ... OBJECTIVE: To explore the difference of body mass index(BMI) and insulin sensitivity index(ISI) in saltsensitive hypertension patients of different traditional Chinese medicine(TCM) syndrome types, so as to elucidate the effect of the distribution of each syndrome on the degree of insulin resistance in salt-sensitive hypertension patients. METHODS: A total of 131 patients with salt-sensitive hypertension were included in the study. Factor analysis and cluster analysis were used to study the characteristics of TCM viscera, syndrome elements and syndrome differentiation. Furthermore, the following parameters were observed and corresponding differences were analyzed, including BMI, waist circumference, abdominal circumference, neck circumference and insulin sensitivity index among group s of different TCM syndrome types. RESULTS: There were 131 cases of saltsensitive hypertension. The results of factor analysis showed that the total variance contribution of F1-5 common factors was 75.8%. According to the pattern differentiation of zang-fu organs, a basic theory of traditional Chinese medicine(TCM), the main zang-fu organs involved in the five common factors are: liver, spleen, and kidney.The main syndrome factors that had been extracted include yin de?ciency, ?re, qi stagnation, yang hyperactivity,dampness, phlegm, qi reversal, heat, retained fluid, essence deficiency, qi descending, qi deficiency, and yang deficiency. Among them, factor 1 accounted for 18.32%, factor 2 accounted for 21.37%, factor 3 accounted for20.43%, factor 4 accounted for 20.61%, and factor 5 accounted for 22.14%. The proportion of zang-fu organs involvement was: 21.37% of the spleen, 17.56% of the kidney, 18.32% of the liver and spleen, and 42.75% of the spleen and kidney. Syndrome elements: yin de?ciency 18.32%, phlegm-dampness 21.37%, qi stagnation 39.69%, qi de?ciency 42.75%, retained ?uid 20.61%, yang de?ciency 60.31%, essence de?ciency 17.56%, qi sinking 17.56%,heat 21.37%, qi reversal 21.37%. Results of cluster analysis: there were 3 cat 展开更多
关键词 Salt-sensitive HYPERTENSION Research of TCM Syndrome Body mass INDEX INSULIN sensitivity INDEX
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The Status Assessment and Preliminary Risk Assessment of Total Mercury in Sediments from Middle and Lower Reaches of the Yarlung Zangbo River 预览
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作者 Qin Dongli Li Lei +6 位作者 Wu Song Wang Nianmin Wang Peng Chen Zhongxiang Ma Bo Bai Shuyan Gao Lei 《气象与环境研究:英文版》 CAS 2019年第3期84-89,共6页
The occurrence and accumulation of total mercury (T-Hg) in sediments collected from the Yarlung Zangbo River (YLZB),the Lhasa River,the Niyang River and the Palongzangbu River were analyzed and the soil samples simult... The occurrence and accumulation of total mercury (T-Hg) in sediments collected from the Yarlung Zangbo River (YLZB),the Lhasa River,the Niyang River and the Palongzangbu River were analyzed and the soil samples simultaneously collected from the bank were employed as control.Meanwhile,pollution status and potential ecological risk of Hg were calculated and assessed using index of geoaccumulation ( I geo ) and potential ecological risk assessment method (Er) in this study.The results showed that the T-Hg concentrations in sediments at eight sections of YLZB ranged from 4.23 to 48.1 μg/kg with mean concentration of 25.1 μg/kg,which was higher than background Hg value of soils in Tibet.T-Hg concentrations in sediments at three typical segments of YLZB were all significantly higher than those in soils collected from its bank (P<0.05).The Igeo and E r indexes revealed that the T-Hg pollution levels were slight pollution in two sections and moderate ecological risk in six sections of YLZB.Hg pollution risks also existed in the sediments of partial sections of the Lhasa River and the Niyang River,and slightly moderate Hg contamination with high ecological risk was presented in Lhasa urban district.The level of Hg in sediments of YLZB showed a notable spatial distribution characteristic with a trend of increasing firstly and then declining.Human activities played an important role in increasing Hg content in sediments of the river. 展开更多
关键词 The Yarlung Zangbo RIVER Total MERCURY Sediment INDEX of geoaccumulation Potential ecological risk INDEX
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Development unit division and favorable area evaluation for joint mining coalbed methane 预览
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作者 YANG Zhaobiao LI Yangyang +6 位作者 QIN Yong SUN Hansen ZHANG Ping ZHANG Zhengguang WU Congcong LI Cunlei CHEN Changxiao 《石油勘探与开发:英文版》 2019年第3期583-593,共11页
Based on the productivity equation of coalbed methane (CBM) well, considering the impact of coal reservoir reformability on gas well productivity, the main production layer optimization index in the “three-step metho... Based on the productivity equation of coalbed methane (CBM) well, considering the impact of coal reservoir reformability on gas well productivity, the main production layer optimization index in the “three-step method” of optimal combination of production layers is corrected, and then the CBM production layer potential index is introduced to evaluate favorable areas for commingled multi-coal seam production. Through analysis of the key parameters of coal reservoirs affecting the CBM productivity index, a development unit division method for areas with multi-coal seams is established, and a quantitative grading index system is proposed. On this basis, the evaluation process of CBM development favorable area is developed: the mature 3-D modeling technology is used to characterize the reservoir physical properties of multi-coal seams in full-scale;the production layer potential index of each grid is calculated, and the production layer potential index contour under single-layer or commingled multi-layer production are plotted;according to the distribution of the contour of production layer potential index, the quantitative index of CBM development unit is adopted to outline the grade I, II, III coal reservoir distribution areas, and thus to pick out the favorable development areas. The practical application in the Yuwang block of Laochang in Yunnan proved that the favorable area evaluation process proposed can effectively overcome the defects of selecting favorable development areas only relying on evaluation results of a major coal seam pay, and enhance the accuracy of the evaluation results, meeting the requirements of selecting favorable areas for multi-coal seam commingled CBM production. 展开更多
关键词 coalbed methane reservoir physical property JOINT MINING production layer potential INDEX DEVELOPMENT unit DIVISION quantitative INDEX favorable area EVALUATION
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Usage patterns of emergency medical services in Korea: analysis of patient flow
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作者 Mira Oh Jae Hyeon Lee +3 位作者 Byoung Uk Jeon Tae Oh Jeong Tag Heo Sungmin Lee 《中华医学杂志:英文版》 SCIE CAS CSCD 2019年第3期259-268,共10页
Background:This study used the National Emergency Department Information System (NEDIS) data to analyze the flow of emergency and critical emergency patients and to identify the patterns of emergency medical service u... Background:This study used the National Emergency Department Information System (NEDIS) data to analyze the flow of emergency and critical emergency patients and to identify the patterns of emergency medical service usage in Korea.Methods:The relevance index (RI) and commitment index (CI) were calculated from the 2016 NEDIS data. In this study, the number of clusters was determined using NbClust, and cluster analysis was used to analyze the usage patterns of emergency and critical emergency patients.Results:The RI and CI were calculated using 8,389,766 cases of 214 districts. The results of the RI and CI suggested that there were 3 types of clusters among the emergency patients. In Cluster 1, 54 districts (25.2%) had low RI and high CI, and it was of outflow type. Cluster 2 was categorized as the influx-type in 58 districts (27.1%) irrespective of RI and low CI. Cluster 3 was categorized as the self-sufficient type found in 102 districts (47.7%), with high RI and high CI. The cluster analysis of the critical emergency patients was divided into 2 types. Cluster 1 was categorized as outflow type with high CI found in 129 districts (60.3%), while Cluster 2 was categorized as inflow type with low CI found in 85 districts (39.7%).Conclusions:This study elucidates the regional status of usage patterns of emergency and critical emergency patients in Korea. This study might serve as a basis for the establishment and selection of emergency medical service areas and vulnerable emergency medical service areas. 展开更多
关键词 CLUSTERING COMMITMENT INDEX EMERGENCY DEPARTMENT National EMERGENCY DEPARTMENT Information System RELEVANCE INDEX
Logging interpretation method for reservoirs with complex pore structure in Mesozoic-Cenozoic faulted basin around Daqing exploration area 预览
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作者 YUE Shanshan FAN Xiaomin HUANG Buzhou 《世界地质:英文版》 2019年第3期209-216,共8页
In Mesozoic-Cenozoic faulted basin in the periphery of Daqing exploration area, the clastic reservoirs mainly consist of siltstone and gravel-bearing sandstone. The electrical conductivity of the reservoirs is complic... In Mesozoic-Cenozoic faulted basin in the periphery of Daqing exploration area, the clastic reservoirs mainly consist of siltstone and gravel-bearing sandstone. The electrical conductivity of the reservoirs is complicated due to the complex pore structures, which cannot be accurately interpreted with commonly used model. In order to solve the problem, a three-water model has been applied in this study based on in-depth analysis of the conductive mechanism of rocks in the explored area, and favorable application results are achieved. 展开更多
关键词 DAQING exploration area MESOZOIC-CENOZOIC faulted BASIN COMPLEX pore structures CEMENTATION INDEX saturation INDEX
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Optimizing partitioning strategies for faster inverted index compression
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作者 Xingshen SONG Yuexiang YANG +1 位作者 Yu JIANG Kun JIANG 《中国计算机科学前沿:英文版》 SCIE EI CSCD 2019年第2期343-356,共14页
The inverted index is a key component for search engines to manage billions of documents and quickly respond to users' queries. Whereas substantial effort has been devoted to reducing space occupancy and decoding ... The inverted index is a key component for search engines to manage billions of documents and quickly respond to users' queries. Whereas substantial effort has been devoted to reducing space occupancy and decoding speed, the encoding speed when constructing the index has been overlooked. Partitioning the index aligning to its clustered distribution can effectively minimize the compressed size while accelerating its construction procedure. In this study, we introduce compression speed as one criterion to evaluate compression techniques, and thoroughly analyze the performance of different partitioning strategies. Optimizations are also proposed to enhance state-of-the-art methods with faster compression speed and more flexibility to partition an index. Experiments show that our methods offer a much better compression speed, while retaining an excellent space occupancy and decompression speed, networks. 展开更多
关键词 in verted INDEX INDEX compression OPTIMAL PARTITION APPROXIMATION algorithm
Endoscopic response to tumor necrosis factor inhibitors predicts long term benefits in Crohn’s disease 预览
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作者 Ignacio Alfaro Maria Carme Masamunt +10 位作者 Nuria Planell Alicia López-García Jesús Castro Marta Gallego Rebeca Barastegui Angel Giner Alejandro Vara Azucena Salas Elena Ricart Julián Panés Ingrid Ordás 《世界胃肠病学杂志:英文版》 SCIE CAS 2019年第14期1764-1774,共11页
BACKGROUND Identifying predictors of therapeutic response is the cornerstone of personalized medicine. AIM To identify predictors of long-term mucosal healing (MH) in patients with Crohn's disease (CD) treated wit... BACKGROUND Identifying predictors of therapeutic response is the cornerstone of personalized medicine. AIM To identify predictors of long-term mucosal healing (MH) in patients with Crohn's disease (CD) treated with tumor necrosis factor α(TNF-α) inhibitors. METHODS Prospective single center study. Consecutive patients with clinically active CD requiring treatment with a TNF-α inhibitor were included. A baseline segmental CD Endoscopic Index of Severity (CDEIS)≥ 10 in at least one segment or the presence of ulcerations were required for inclusion. Clinical, biological and endoscopic data were obtained at baseline, weeks 14 and 46. Endoscopic response (ER) was defined as a decrease ≥ 50% from baseline CDEIS and MH as partial CDEIS ≤ 5 in all segments. RESULTS Of 62 patients were included. At baseline, median CD Activity Index and CDEIS were 201 and 6.7, respectively with a significant reduction after one year of treatment (53 and 3.0 respectively, P < 0.001). At week 14, 56% of patients achieved ER and 34% MH. At week 46, the corresponding percentages were 52% and 44%. Baseline disease characteristics or biomarkers did not predict MH. A decrease from baseline CDEIS at week 14 of at least 80% was the best predictor of MH at week 46 (59% sensitivity and 91% specificity;area under the curve = 0.778).CONCLUSION Clinical and biomarker data are not useful predictors of response to TNF-α inhibitors in CD, whereas ER to induction therapy, defined as 80% reduction in global CDEIS, is a robust predictor of long-term MH. Achievement of this endoscopic endpoint may be considered as a therapeutic target for anti-TNF-α therapy. 展开更多
关键词 Crohn’s DISEASE Endoscopy MUCOSAL HEALING Crohn’s DISEASE ENDOSCOPIC Index of SEVERITY Tumor NECROSIS factor
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1951~2017年厄尔尼诺/拉尼娜对韶关市旱涝灾害的影响 预览
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作者 吴洁玲 周嘉琦 +3 位作者 成思佩 陈洁 梁子浩 陈世发 《亚热带水土保持》 2019年第2期19-24,共6页
为揭示厄尔尼诺事件对韶关市1951~2017年的旱涝灾害的影响,以韶关市同期降水量为基础,利用Z指数划分旱涝等级,采用Mann-Kendall突变检验等方法研究厄尔尼诺对韶关旱涝灾害的影响。结果表明:①韶关市年降雨量整体呈现上升趋势,且旱涝等级... 为揭示厄尔尼诺事件对韶关市1951~2017年的旱涝灾害的影响,以韶关市同期降水量为基础,利用Z指数划分旱涝等级,采用Mann-Kendall突变检验等方法研究厄尔尼诺对韶关旱涝灾害的影响。结果表明:①韶关市年降雨量整体呈现上升趋势,且旱涝等级在1954、2011和2012年发生突变;②韶关市在67年间总共发生了22次洪涝、26次干旱、19次正常年份,涝年出现的几率为32.8%,旱年出现几率为38.8%;③韶关市旱涝灾害Z指数呈现上升趋势,厄尔尼诺事件发生时韶关市出现旱涝灾害概率较拉尼娜事件时高,韶关市旱涝灾害等级随着厄尔尼诺/拉尼娜强度等级的增加而呈现出线性增加的趋势。研究为指导韶关市防洪抗旱提供一定的参考。 展开更多
关键词 旱涝灾害 Z指数 MANN-KENDALL 厄尔尼诺 韶关市
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An Assessment of ENSO Stability in CAMS Climate System Model Simulations
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作者 Lijuan HUA Lin CHEN +3 位作者 Xinyao RONG Jian LI Guo ZHANG Lu WANG 《气象学报:英文版》 SCIE CSCD 2019年第1期80-88,共9页
We present an overview of the El Ni?o–Southern Oscillation(ENSO) stability simulation using the Chinese Academy of Meteorological Sciences climate system model(CAMS-CSM). The ENSO stability was quantified based on th... We present an overview of the El Ni?o–Southern Oscillation(ENSO) stability simulation using the Chinese Academy of Meteorological Sciences climate system model(CAMS-CSM). The ENSO stability was quantified based on the Bjerknes(BJ) stability index. Generally speaking, CAMS-CSM has the capacity of reasonably representing the BJ index and ENSO-related air–sea feedback processes. The major simulation biases exist in the underestimated thermodynamic damping and thermocline feedbacks. Further diagnostic analysis reveals that the underestimated thermodynamic feedback is due to the underestimation of the shortwave radiation feedback, which arises from the cold bias in mean sea surface temperature(SST) over central–eastern equatorial Pacific(CEEP). The underestimated thermocline feedback is attributed to the weakened mean upwelling and weakened wind–SST feedback(μ_a) in the model simulation compared to observation. We found that the weakened μ_a is also due to the cold mean SST over the CEEP.The study highlights the essential role of reasonably representing the climatological mean state in ENSO simulations. 展开更多
关键词 coupled general CIRCULATION model(CGCM) Bjerknes(BJ) STABILITY index air–sea FEEDBACK
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