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Profitability Analysis of Small Scale Irrigation Technology Adoption to Farmers in Nasho Sector, Rwanda 认领
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作者 Eliezel Habineza Jean Nepomuscene Nsengiyumva +1 位作者 Eric Ruzigamanzi Martin Vincent Nsanzumukiza 《农业化学和环境(英文)》 2020年第2期73-84,共12页
The study aims to assess the effect of small scale irrigation adoption to farmers in Nasho sector, Kirehe District in Rwanda. The average yield was 12,309.73 Kg/2.62 ha or 4698.73 Kg/ha for adopters with the mean diff... The study aims to assess the effect of small scale irrigation adoption to farmers in Nasho sector, Kirehe District in Rwanda. The average yield was 12,309.73 Kg/2.62 ha or 4698.73 Kg/ha for adopters with the mean difference between adopters and non adopters ranged from 2819.63 Kg to 4766.59 Kg per unit area of production. For food security status, the average mean quantity of maize consumed at home level was 615.54 Kg with the mean difference ranged from 377.29 Kg to 474.68 Kg. For market participation, the average treatment effect of the treated (ATT) of quantity of maize sold was 11,694.24 Kg while the mean difference ranged from 7165.98 Kg to 9015.60 Kg. The Average Treatment Effect of the Treated market price was 213 Frws/Kg while the mean difference ranged from 44.51 Frws/Kg to 48.3053 Frws/Kg. The Average Treatment Effect of the Treated of farmer’s revenues for the users was 938,772 Frws/ha, however, the mean difference between adopters and non adopters ranged from 1,732,942 Frws to 2,007,039 Frws. The Average Treatment Effect of the Treated of farmer’s net farm income was 1,066,393 Frws while mean difference between users and non users ranged from 803,967 Frws to 854,141 Frws. For profitability analysis, the cost benefit ratio (CBR) was taken into account. The total benefit per unit area was 2,434,509 Frws and total average mean cost of 1,382,313 Frws and CBR = 1.761 > 1. The findings of this study will help the policy makers for deeper sector planning and also, it will facilitate other stakeholders to invest in irrigation technology to improve the livelihoods of Rwandan farmers and other surroundings. 展开更多
关键词 PROFITABILITY Small Scale ïrrigation PROPENSITY SCORE Matching FARMERS Treatment Effect
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基于不同尺度的中国优质医疗资源区域差异研究 认领
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作者 赵雪雁 王晓琪 +2 位作者 刘江华 王蓉 薛冰 《经济地理》 CSSCI CSCD 北大核心 2020年第7期22-31,共10页
优质医疗资源分布不均已成为影响人民健康水平的重要民生问题,探明优质医疗资源的区域差异及影响因素,对制定合理的医疗卫生政策、推进健康中国战略至关重要。文章从省级、城市群和地级市尺度出发,采用GDI、ESDA等方法分析了2006—2017... 优质医疗资源分布不均已成为影响人民健康水平的重要民生问题,探明优质医疗资源的区域差异及影响因素,对制定合理的医疗卫生政策、推进健康中国战略至关重要。文章从省级、城市群和地级市尺度出发,采用GDI、ESDA等方法分析了2006—2017年中国优质医疗资源的时空差异,并利用地理探测器方法识别了影响不同尺度优质医疗资源分布的关键因素。结果表明:①2006—2017年中国优质医疗资源水平趋于提升、区域差异缩小,且尺度越小,优质医疗资源的差异越大。其中,差异程度随城市群等级的降低而增大,但随城市规模的缩小而减小。②不同尺度上优质医疗资源的空间集聚程度不同,且尺度越大,集聚程度越高。其中,省级、地级市尺度优质医疗资源较高水平区多集中在胡焕庸线以东地区,城市群尺度主要集中在国家级城市群及哈长、中原等区域性城市群。③不同尺度上影响优质医疗资源分布的关键因子及各因子间的交互作用存在差异,且尺度越小,影响优质医疗资源分布的因子越复杂。 展开更多
关键词 优质医疗资源 尺度 区域差异 城市群 人口规模 经济发展水平
蒸汽锅炉水处理剂的应用研究 认领
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作者 熊丽萍 周江涛 《云南化工》 CAS 2020年第3期117-121,共5页
工业锅炉应用中常有结垢、腐蚀和锅炉水夹带等问题,造成生产工艺的干扰和设备损坏。综述了造成这些问题的常见原因及处理办法,同时结合浙江某石化公司公用蒸汽锅炉的药剂处理方案,发现通过添加合适的化学药剂可以有效的进行锅炉除氧、... 工业锅炉应用中常有结垢、腐蚀和锅炉水夹带等问题,造成生产工艺的干扰和设备损坏。综述了造成这些问题的常见原因及处理办法,同时结合浙江某石化公司公用蒸汽锅炉的药剂处理方案,发现通过添加合适的化学药剂可以有效的进行锅炉除氧、缓蚀和阻垢。旨在为新型药剂在锅炉水处理中的应用提供研究方向。 展开更多
关键词 蒸汽锅炉 腐蚀 除氧剂 阻垢剂
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Comparing the Area of Data Mining Algorithms in Network Intrusion Detection 认领
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作者 Yasamin Alagrash Azhar Drebee Nedda Zirjawi 《信息安全(英文)》 2020年第1期1-18,共18页
The network-based intrusion detection has become common to evaluate machine learning algorithms. Although the KDD Cup’99 Dataset has class imbalance over different intrusion classes, still it plays a significant role... The network-based intrusion detection has become common to evaluate machine learning algorithms. Although the KDD Cup’99 Dataset has class imbalance over different intrusion classes, still it plays a significant role to evaluate machine learning algorithms. In this work, we utilize the singular valued decomposition technique for feature dimension reduction. We further reconstruct the features form reduced features and the selected eigenvectors. The reconstruction loss is used to decide the intrusion class for a given network feature. The intrusion class having the smallest reconstruction loss is accepted as the intrusion class in the network for that sample. The proposed system yield 97.90% accuracy on KDD Cup’99 dataset for the stated task. We have also analyzed the system with individual intrusion categories separately. This analysis suggests having a system with the ensemble of multiple classifiers;therefore we also created a random forest classifier. The random forest classifier performs significantly better than the SVD based system. The random forest classifier achieves 99.99% accuracy for intrusion detection on the same training and testing data set. 展开更多
关键词 Feature Reduction SINGULAR Value Decomposition INTRUSION DETECTION Correlation Analysis Association Impact Scale INTRUSION DETECTION System KDD CUP 1999 Random FOREST
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国家级新区的治理尺度建构及其经济效应评价 认领
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作者 晁恒 李贵才 《地理研究》 CSSCI CSCD 北大核心 2020年第3期495-507,共13页
国家级新区作为中国战略空间的核心内容,其设立与发展过程中的治理尺度建构至关重要。论文从尺度重构视角建立了分析框架,以此来考察国家级新区治理尺度建构的实践,并采用回归模型实证检验了不同治理类型的经济效应。研究认为,国家级新... 国家级新区作为中国战略空间的核心内容,其设立与发展过程中的治理尺度建构至关重要。论文从尺度重构视角建立了分析框架,以此来考察国家级新区治理尺度建构的实践,并采用回归模型实证检验了不同治理类型的经济效应。研究认为,国家级新区治理尺度建构是各级行政主体通过刚性或柔性的手段在新区的定位、区划和权力配置等方面进行变革的作用过程。在具体实践中,不同国家级新区所建构的治理尺度在地域空间组织、行政主体构成和权力分配等方面具有显著差异,形成了多样化的治理类型。其中,"市辖区+合署办公"和"市辖区+管委会"等治理类型具有较高的经济效应,有助于解决权力边界模糊和治理主体多元等问题,而"市辖县+管委会"和"跨地市+管委会"等治理类型则表现出较低的经济效应。对于跨地级市或包含市辖县的国家级新区,需要适时推进"撤县设区"来简化治理主体或通过上级政府的"强势权力介入"来统一地域发展逻辑。 展开更多
关键词 国家级新区 尺度 尺度重构 治理 经济效应
Roles of Synoptic to Quasi-Monthly Disturbances in Generating Two Pre-Summer Heavy Rainfall Episodes over South China 认领
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作者 Zhina JIANG Da-Lin ZHANG Hongbo LIU 《大气科学进展:英文版》 SCIE CAS CSCD 2020年第2期211-228,共18页
In this study,power spectral analysis and bandpass filtering of daily meteorological fields are performed to explore the roles of synoptic to quasi-monthly disturbances in influencing the generation of pre-summer heav... In this study,power spectral analysis and bandpass filtering of daily meteorological fields are performed to explore the roles of synoptic to quasi-monthly disturbances in influencing the generation of pre-summer heavy rainfall over South China.Two heavy rainfall episodes are selected during the months of April-June 2008-15,which represent the collaboration between the synoptic and quasi-biweekly disturbances and the synoptic and quasi-monthly disturbances,respectively.Results show that the first heavy rainfall episode takes place in a southwesterly anomalous flow associated with an anticyclonic anomaly over the South China Sea(SCS)at the quasi-biweekly scale with 15.1%variance contributions,and at the synoptic scale in a convergence zone between southwesterly and northeasterly anomalous flows associated with a southeastward-moving anticyclonic anomaly on the leeside of the Yungui Plateau and an eastwardpropagating anticyclonic anomaly from higher latitudes with 35.2%variance contribution.In contrast,the second heavy rainfall episode takes place in southwest-to-westerly anomalies converging with northwest-to-westerly anomalies at the quasi-monthly scale with 23.2%variance contributions to the total rainfall variance,which are associated with an anticyclonic anomaly over the SCS and an eastward-propagating cyclonic anomaly over North China,respectively.At the synoptic scale,it occurs in south-to-southwesterly anomalies converging with a cyclonic anomaly on the downstream of the Yungui Plateau with 49.3%variance contributions.In both cases,the lower-tropospheric mean south-to-southwesterly flows provide ample moisture supply and potentially unstable conditions;it is the above synoptic,quasi-biweekly or quasimonthly disturbances that determine the general period and distribution of persistent heavy rainfall over South China. 展开更多
关键词 SYNOPTIC scale pre-summer rainfall quasi-biweekly scale quasi-monthly disturbances
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三峡库区山区农业生态系统转型 认领
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作者 梁鑫源 李阳兵 +1 位作者 邵景安 冉彩虹 《地理学报:英文版》 SCIE CSCD 2020年第2期281-296,共16页
The Three Gorges Reservoir Area(TGRA)is typical of an ecologically vulnerable area,comprised of rural and mountainous areas,and with high immigration.Because of its economic and ecologic importance,studying the tradit... The Three Gorges Reservoir Area(TGRA)is typical of an ecologically vulnerable area,comprised of rural and mountainous areas,and with high immigration.Because of its economic and ecologic importance,studying the traditional agroecosystem changes in the TGRA is key to rural development and revitalization.In this study,we apply a framework of theoretical analysis,empirical study,and trend prediction to the Caotangxi River watershed within the TGRA.Using QuickBird high-resolution remote sensing images from 2012 to 2017 to evaluate natural resources and farmers’behavior,we analyze the transition and trends in the traditional agroecosystem in mountainous areas of the TGRA at spatial scale of the man-land relationship.We find that the agroecosystem in the TGRA can be divided into four modes using 100 m interval buffer rings:high-low-low,high-low-high,low-high-low and low-low-high mode where the different modes represent the agricultural development stages in the TGRA.Furthermore,the traditional agroecosystem in TGRA,represented by system elements such as farmers and sloping farmland,is transforming to accommodate the diversification of farmer livelihoods.For example,sloping farmland,which was dominated by a production function,now has equal emphasis on ecological and economic functions.Spatially,the range of the agroecosystem transition has migrated beyond high mountain areas to flat valley areas.Generally,this study provides an overview of land use in rural areas,controls on soil and water loss in mountainous areas,and better rural living environments in the TGRA. 展开更多
关键词 Three Gorges RESERVOIR Area ecologically fragile area mountainous area TRADITIONAL AGROECOSYSTEM TRANSITION empirical study SPATIAL scale
Development and Validation of a Tool to Assess Hepatocellular Carcinoma Knowledge among Hepatocellular Carcinoma Patients in Taiwan 认领
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作者 Yueh-Ling Liao Tsae-Jyy Wang Tzeng-Hue Yang 《护理学期刊(英文)》 2020年第4期341-352,共12页
Background: Hepatocellular carcinoma (HCC) is a high incidence and high mortality disease. The choice of cancer treatment is extremely important and involves a high-risk, complex and difficult decision-making process.... Background: Hepatocellular carcinoma (HCC) is a high incidence and high mortality disease. The choice of cancer treatment is extremely important and involves a high-risk, complex and difficult decision-making process. Although the guidelines use evidence for disease treatment, due to the individual patient factors and tumor stage differences, cancer treatment decisions by patients still lead to uncertainty. Objective: When people lack information or skills, they may make decisions that are not optimal. Clinically, we use educational programs to improve patient knowledge but there’s no relevant knowledge scale that can be used as an assessment tool. Therefore, it is necessary to develop a convenient and usable knowledge scale. Methods: Based on research purposes, literature review and what physicians believe patients need to know about liver cancer, we built a liver cancer knowledge scale. Results: The total number of participants is 102, of which 66 are male and 36 are female. There is satisfactory internal consistency reliability 0.745, test-retest reliability 1.0 and construct validity were noted CVI 0.96. There was adequate overall evidence for convergent (p = 0.001) and discriminatory validity (p Conclusions: This knowledge scale can provide hepatocellular carcinoma before and after treatment evaluation whether patients have sufficient knowledge. 展开更多
关键词 Validity HEPATOCELLULAR Carcinoma KNOWLEDGE Scale ITEM Analysis
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The Translation of Perinatal Anxiety Screening Scale (PASS) into Arabic 认领
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作者 Eqbal Mohammad Alfarajat Areej Othman Inaam Khalaf 《护理学期刊(英文)》 2020年第4期367-380,共14页
Background: early detection of perinatal anxiety using appropriate measures helps in reducing maternal and fetal complication. WHO guidelines for instrument translation and adaptation provide rigor and transparent met... Background: early detection of perinatal anxiety using appropriate measures helps in reducing maternal and fetal complication. WHO guidelines for instrument translation and adaptation provide rigor and transparent method for Perinatal Anxiety Screening Scale (PASS) translation and expand the knowledge in diversity cultural contexts. Aim: to describe the process of cultural adaptation of the PASS into the Jordanian context based on the WHO framework for instrument translation and adaptation. Methods: PASS was completed by a convenience sample of 31 pregnant women. In which PASS went through WHO framework for instrument translation and adaptation process includes forward translation, expert panel, blind back translation, pre testing and cognitive interview, and the final version is ready for piloting. Some comments were added to three items by five expert panel, then the modified version was ready for piloting. Result: the internal consistency reliability of PASS was 0.869 and five experts who reviewed PASS confirmed the scale appropriateness and clarity after a slight modification to three items. Participants found PASS in general easy to complete but some of them found difficulties in understanding two items located in the Perfectionism, control and trauma subscale where they need an explanation of their meaning to answer them. Conclusion: using WHO guidelines for instruments translation considered a rigorous method and revealed that PASS is reliable and valid tool to be used within the Jordanian context to measure perinatal anxiety. However, the focus on explaining items 11 and 14 to participants is important due to difficulty in understanding their meaning. 展开更多
关键词 PERINATAL ANXIETY Screening Scale (PASS) WHO TRANSLATION Guidelines ARABIC TRANSLATION Jordan Reliability Validity
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Optimization Scale Pasteurization of Baobab Juice Using Response Surface Methodology (RSM) 认领
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作者 Ndiaye Ndeye Adiara Bassama Joseph +2 位作者 Dieng Modou N. C. Toure/kane Montet Didier 《食品与营养科学(英文)》 2020年第2期113-122,共10页
The Adansonia digitate L. known as Baobab is the only species present in West Africa and grows wild. All parts of the plant are used by humans. In Senegal, baobab pulp is widely consumed;it is used as raw material in ... The Adansonia digitate L. known as Baobab is the only species present in West Africa and grows wild. All parts of the plant are used by humans. In Senegal, baobab pulp is widely consumed;it is used as raw material in small and medium enterprises (SMEs) for making juices, concentrates, jams, powder. Drinks or juices from baobab are highly appreciated by consumers;however rapid fermentation can happen even after pasteurization that can shorten their shelf-life. A Doehlert experimental design was used to find a good scale of heat treatment ensuring a proper conservation of baobab juice. Results of the experimental design showed that a heat treatment of 80&deg;C for 10 min gives a baobab juice with good sanitary quality that meets the international standards. 展开更多
关键词 Baobab JUICE SCALE of PASTEURIZATION Doehlert EXPERIMENTAL PLAN Response Surface Method
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纺织厂循环水系统的运行问题及其解决措施 认领
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作者 张佳丽 颜苏芊 《毛纺科技》 CAS 北大核心 2020年第4期50-55,共6页
针对纺织厂循环水系统在运行中存在结垢、细菌滋生等问题,现场采集纺织厂水系统不同部位的水垢,使用扫描电镜和能谱仪进行外观和成分分析,得出主要水垢类别为碳酸盐水垢、硅酸盐水垢和镁垢。结合水质检测方法,对循环水和补充水的pH值、... 针对纺织厂循环水系统在运行中存在结垢、细菌滋生等问题,现场采集纺织厂水系统不同部位的水垢,使用扫描电镜和能谱仪进行外观和成分分析,得出主要水垢类别为碳酸盐水垢、硅酸盐水垢和镁垢。结合水质检测方法,对循环水和补充水的pH值、碱度、硬度、电导率进行监测,得到水质变化规律,即在水系统没有排污的情况下,循环水的pH值、碱度、硬度、电导率的值均随着循环时间的增加而有不同程度增大。文章提出一种反渗透技术,利用新型反渗透膜阻垢器,阻垢率可达97%以上,可以解决循环水系统在运行中遇到的问题。 展开更多
关键词 循环水系统 水质监测 结垢 细菌滋生 反渗透膜阻垢器 反渗透技术 纺织厂
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酒东油田采出水回注结垢分析和阻垢剂筛选 认领
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作者 李艳琦 《精细石油化工进展》 CAS 2020年第3期54-57,共4页
针对油田采出水回注结垢严重,对酒东油田K1g1与K1g3油藏采出水成分进行研究,得出结垢物主要为碳酸钙和硫酸钙.通过对阻垢剂聚天冬氨酸(PASP)、乙二胺四亚甲基磷酸钠(EDTMPS)、羟基乙叉二膦酸(ATMP)、二乙烯三胺五甲叉膦酸七钠(DTPMP... 针对油田采出水回注结垢严重,对酒东油田K1g1与K1g3油藏采出水成分进行研究,得出结垢物主要为碳酸钙和硫酸钙.通过对阻垢剂聚天冬氨酸(PASP)、乙二胺四亚甲基磷酸钠(EDTMPS)、羟基乙叉二膦酸(ATMP)、二乙烯三胺五甲叉膦酸七钠(DTPMP·Na7)进行阻垢性能评价,得出聚天冬氨酸(PASP)阻垢性能最好,优选的阻垢剂能够抑制或减缓注水系统结垢对油田生产的影响,保障油水井正常生产. 展开更多
关键词 酒东油田 结垢物 阻垢剂 碳酸钙 聚天冬氨酸
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纺织厂循环水系统的水质及酸碱两种阻垢剂的应用 认领
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作者 张佳丽 颜苏芊 +1 位作者 王力平 秦莉 《上海纺织科技》 北大核心 2020年第9期50-54,共5页
在对咸阳、西安两地纺织厂循环水系统取水测试中发现,当循环时间相同时,咸阳循环水平均总硬度为476.0 mg/mL(所述硬度均以CaCO3计),硬度很高;西安循环水平均总硬度为331.3 mg/mL,水质硬度低于咸阳。两地纺织厂循环水系统管道和设备都存... 在对咸阳、西安两地纺织厂循环水系统取水测试中发现,当循环时间相同时,咸阳循环水平均总硬度为476.0 mg/mL(所述硬度均以CaCO3计),硬度很高;西安循环水平均总硬度为331.3 mg/mL,水质硬度低于咸阳。两地纺织厂循环水系统管道和设备都存在结垢问题。采用添加阻垢剂的方法,分别测试了YC2655酸性阻垢剂和PC2566碱性阻垢剂的阻垢性能及其对水系统设备、管道的腐蚀性。试验结果显示,PC2566碱性阻垢剂阻垢率为69.3%,且对纺织厂循环水系统设备、管道无腐蚀,可解决纺织厂循环水系统的结垢问题。 展开更多
关键词 纺织厂 循环水 水质 结垢 阻垢剂
有鳞目动物鳞片表面超微结构的适应性进化 认领
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作者 王可心 赵雨恬 +3 位作者 蒋怡锦 戴颖玉 胡超超 屈彦福 《动物学杂志》 CAS CSCD 北大核心 2020年第2期113-133,共21页
爬行动物鳞片的微结构是对环境的一种适应。本研究运用扫描电子显微镜观察了北草蜥(Takydromus septentrionalis)、脆蛇蜥(Dopasia harti)和王锦蛇(Elaphe carinata)头部、背部和腹部鳞片的微皮纹结构及感受器特征。结果表明,3个物种的... 爬行动物鳞片的微结构是对环境的一种适应。本研究运用扫描电子显微镜观察了北草蜥(Takydromus septentrionalis)、脆蛇蜥(Dopasia harti)和王锦蛇(Elaphe carinata)头部、背部和腹部鳞片的微皮纹结构及感受器特征。结果表明,3个物种的微皮纹和感受器存在种间差异。北草蜥和王锦蛇背部及腹部微皮纹均为狭长带状,脆蛇蜥为不规则多边形。北草蜥和王锦蛇颔片上有感受器,北草蜥无。脆蛇蜥腹部微皮纹上无小齿状凸起,北草蜥和王锦蛇有,与北草蜥相比王锦蛇的小齿状凸起更宽更长。王锦蛇的眼部微皮纹为向上竖起的脊,而其他部位的鳞片为具有小齿状凸起的狭长带状结构。本研究共收集整理17科99种的背鳞微皮纹数据和8科25种的感受器数据,对微皮纹特征和感受器形态进行祖先重建发现,狭长带状背鳞微皮纹主要存在于蜥蜴科(Lacertidae)、游蛇科(Colubridae)和石龙子科(Scincidae)中,而鬛蜥科(Agamidae)、蛇蜥科(Anguidae)、蟒蛇科(Boidae)以及蝰蛇科(Viperidae)的大多为多边形;较原始的感受器形态为无感觉毛的透镜状,这一结构在有鳞目动物进化中发生多次演化。本研究发现蛇蜥的鳞片表面微结构更接近于蛇类动物。因此,有鳞类动物鳞片微皮纹特征和皮肤感受器的形态是对其所处环境多重压力的优化选择。 展开更多
关键词 鳞片 微皮纹 感受器 祖先重建 有鳞目
Differences in parents of pediatric liver transplantation and chronic liver disease patients 认领
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作者 Sami Akbulut Gulsen Gunes +5 位作者 Hasan Saritas Bahar Aslan Yunus Karipkiz Khaled Demyati Sukru Gungor Sezai Yilmaz 《世界临床病例杂志》 SCIE 2020年第11期2162-2172,共11页
BACKGROUND With advancements in the treatment of chronic liver disease(CLD),including liver transplantation(LT),quality of life and satisfaction after LT have become an important issue for pediatric patients and their... BACKGROUND With advancements in the treatment of chronic liver disease(CLD),including liver transplantation(LT),quality of life and satisfaction after LT have become an important issue for pediatric patients and their parents.More evidence-based information is needed to describe and assess the impact of pediatric CLD on parents and the satisfaction of parents with treatment to better understand their needs.AIM To assess the satisfaction of parents of pediatric LT patients and that of parents of pediatric CLD patients METHODS During this survey,data were collected from parents of pediatric patients who underwent LT between January 2010 and April 2017(LT group;n=91)and parents of pediatric patients with chronic liver disease(CLD group;n=94).Group comparisons were made based on the pediatric health-related quality of life(PedsQL)health care parent satisfaction scale,impact on family scale(IFS)and demographic characteristics.The PedsQL was administered to parents during a phone interview and the results were used to assess the health carerelated satisfaction of parents.The IFS was used to assess the impact of the child’s CLD status on the family.Demographic variables such as education level(elementary vs middle vs high vs university),monthly income(low vs middle vs high),and place of residence(village vs town vs city)were compared between CLD and LT parent groups.Finally,PedsQL and IFS results were also analyzed according to demographic variables.RESULTS A total of 185 parents aged 19 to 65 years were included.There were statistically significant differences between the LT and CLD groups in terms of career(P<0.001),monthly income(P=0.016),and education level(P=0.041).According to the PedsQL results,family inclusion,communication,technical skills,emotional needs,and overall satisfaction were significantly different between the groups;the LT group had consistently higher scores(P<0.001).Additionally,scores for the IFS parameters of financial impact,familial-social impact,personal strain,and total impact were consiste 展开更多
关键词 Liver transplantation Pediatric liver transplantation Chronic liver disease Parent satisfaction Health-related quality of life health care parent satisfaction scale Impact on family scale
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基于灵敏度对比分析SCALE 6.1自带库与CENDL-TMSR-V1数据库 认领
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作者 胡继峰 王小鹤 +2 位作者 邹春燕 韩建龙 陈金根 《原子能科学技术》 EI CAS CSCD 北大核心 2020年第8期1453-1459,共7页
为满足钍基熔盐堆物理设计和钍铀燃料循环物理分析对核数据的需求,中国核数据中心研制了一套钍铀燃料循环专用数据库CENDL-TMSR-V1。本文利用SCALE程序,针对熔盐堆开展了SCALE 6.1自带数据库和CENDL-TMSR-V1库对比分析。结果显示,针对1 ... 为满足钍基熔盐堆物理设计和钍铀燃料循环物理分析对核数据的需求,中国核数据中心研制了一套钍铀燃料循环专用数据库CENDL-TMSR-V1。本文利用SCALE程序,针对熔盐堆开展了SCALE 6.1自带数据库和CENDL-TMSR-V1库对比分析。结果显示,针对1 GWt钍增殖熔盐堆,利用两个数据库的238群数据计算的不同燃耗下k eff最大差异约1200 pcm。结合核数据对k eff的灵敏度分析显示,其差异主要由石墨的核数据不同引起的。宏观检验结果显示,CENDL-TMSR-V1库中石墨数据更合理。同时,基于CENDL-TMSR-V144群协方差数据,计算得到核数据对初始时刻k eff总不确定度为1.03%,约为SCALE 6.1自带44群协方差数据库计算结果的2倍,其差异主要由233 U、232 Th等核素的协方差数据不同导致。 展开更多
关键词 CENDL-TMSR-V1数据库 SCALE 6.1自带数据库 灵敏度 k eff 不确定度
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农户的非农就业如何影响中国的土地流转? 认领
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作者 王佳月 辛良杰 王亚辉 《地理学报:英文版》 SCIE CSCD 2020年第3期378-400,共23页
To clarify the impact of non-agricultural employment on rural land circulation in China,we built logit models using the Chinese Household Income Project 2013 dataset,which includes 18,948 household samples over 15 pro... To clarify the impact of non-agricultural employment on rural land circulation in China,we built logit models using the Chinese Household Income Project 2013 dataset,which includes 18,948 household samples over 15 provinces,126 cities and 234 counties of China in 2013.We use the proportion of non-agricultural income,the proportion of non-agricultural laborers and non-agricultural fixed operating assets to reflect the degree of the households’dependence on agriculture,the degree of the households’laborers committed to non-agricultural employment and the stability of non-agricultural employment,respectively.The results show that the stability of non-agricultural employment is an important reason for farmers to transfer out their land,and an increase in non-agricultural income is the fundamental reason.The proportion of non-agricultural assets has the greatest impact on the decision to transfer land,followed by the proportion of non-agricultural income.Per unit increase in the non-agricultural income ratio has a stronger effect on the transfer-out decision than it does on the transfer-in decision,which is a 0.09 increase of the probability of transfer-out the land and a 0.07 decrease of the probability of transfer-in the land.In terms of regional differences,when considering the impact of non-agricultural employment on the land transfer-out decision,the impacts of non-agricultural income and labor force are the greatest in the Central region.The impact of non-agricultural assets is the greatest in the Eastern region.For the Eastern region,the decision to transfer out land is mainly affected by non-agricultural assets and the non-agricultural labor force,and the decision to transfer in land is mainly affected by non-agricultural assets.In the Central and Western regions,the decision to transfer out land is mainly affected by non-agricultural assets,non-agricultural income and the non-agricultural labor force,in that order.The decision to transfer in land in the Central region is not significantly affected by non- 展开更多
关键词 farmers’non-agricultural employment rural land circulation moderate scale management China CHIP2013 dataset
潜油电泵防腐防垢技术现状及对策 认领
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作者 商鹏 孟勇 +3 位作者 卢新甫 郭峻李 彭春洋 王佰民 《石油石化节能》 2020年第1期24-27,I0003,I0004共6页
在油田采油过程中,腐蚀和结垢是一个常见的实际问题,潜油电泵机组工作在井下,浸入在井液中,因分离器、保护器腐蚀断脱造成机组落井以及离心泵严重结垢卡泵造成的机组故障较为突出,给潜油电泵采油设备的可靠性造成了巨大的影响。针对这... 在油田采油过程中,腐蚀和结垢是一个常见的实际问题,潜油电泵机组工作在井下,浸入在井液中,因分离器、保护器腐蚀断脱造成机组落井以及离心泵严重结垢卡泵造成的机组故障较为突出,给潜油电泵采油设备的可靠性造成了巨大的影响。针对这些问题采取了相应的一些行之有效的措施,如添加抗腐剂、阻垢剂等,但由于造成腐蚀、结垢的原因较多,每个区块、地层各不相同,而电泵产液量又很大,找到合适的解决方案需要投入大量的资金且施工困难。笔者通过对电泵井腐蚀、结垢的原因以及设备破坏的主要部位进行分析,在电泵机组自身局部采取一些加强措施,以达到防腐、防垢的目的,通过实施并现场应用,取得了较好的应用效果。 展开更多
关键词 电泵机组 腐蚀 结垢 防腐防垢技术
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Clinical application of Chinese Nanjing persistent vegetative state scale 认领
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作者 Pei-Dong Wang Li Gao +4 位作者 Hai-Bo Di Jing-Qi Li Ying-Ying Ni De-Sheng Wang Xin-Sheng Ding 《中华医学杂志:英文版》 SCIE CAS CSCD 2020年第12期1404-1408,共5页
Background:It is a challenge to characterize the consciousness level of patients with severe disturbance of consciousness and predict their prognosis effectively for Chinese doctors.We aimed to investigate the psychom... Background:It is a challenge to characterize the consciousness level of patients with severe disturbance of consciousness and predict their prognosis effectively for Chinese doctors.We aimed to investigate the psychometric property and the diagnostic practicality of severe disturbance of consciousness by Chinese Nanjing persistent vegetative state scale(CNPVSS)which was first set up in 1996 and modified in 2001 and 2011.Methods:The concurrent validity,inter-rater consistency and diagnostic accuracy of CNPVSS and Chinese version of coma recovery scale-revised(CRS-R)were investigated by assessment of 380 patients with severe disorders of consciousness.Results:Total scores of the CNPVSS were correlated significantly with that of the CRS-R,indicating acceptable concurrent validity.Sub-scale analysis showed moderate to high inter-rater reliability and test-retest reliability.CNPVSS was superior to CRS-R on the diagnosis sensitivity.The CNPVSS was able to distinguish 65 patients in emergence from minimal consciousness state who were misclassified as in minimal consciousness state(MCS)by the CRS-R,and it could also distinguish two patients in MCS who were misclassified as in vegetative state by the CRS-R.Conclusion:The CNPVSS is an appropriate measurement and is sensitive to distinguish the MCS patients from the VS patients. 展开更多
关键词 Chinese Nanjing persistent vegetative state scale Coma recovery scale-revised Emergence from minimal consciousness state Minimal consciousness state Severe disorders of consciousness Unresponsive wakefulness syndrome Vegetative state
Efficacy of cattle encephalon glycoside and ignotin in patients with acute cerebral infarction:a randomized,double-blind,parallel-group,placebo-controlled study 认领
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作者 Hui Zhang Chuan-Ling Li +11 位作者 Feng Wan Su-Juan Wang Xiu-E Wei Yan-Lei Hao Hui-Lin Leng Jia-Min Li Zhong-Rui Yan Bao-Jun Wang Ren-Shi Xu Ting-Min Yu Li-Chun Zhou Dong-Sheng Fan 《中国神经再生研究:英文版》 SCIE CAS CSCD 2020年第7期1266-1273,共8页
Cattle encephalon glycoside and ignotin(CEGI)injection is a compound preparation formed by a combination of muscle extract from hea lthy rabbits and brain gangliosides from cattle,and it is generally used as a neuropr... Cattle encephalon glycoside and ignotin(CEGI)injection is a compound preparation formed by a combination of muscle extract from hea lthy rabbits and brain gangliosides from cattle,and it is generally used as a neuroprotectant in the treatment of central and peripheral nerve injuries.However,there is still a need for high-level clinical evidence from large samples to support the use of CEGI.We therefore carried out a prospective,multicenter,randomized,double-blind,parallel-group,placebo-controlled study in which we recruited 319 patients with acute cerebral infarction from 16 centers in China from October 2013 to May 2016.The patients were randomized at a 3:1 ratio into CEGI(n=239;155 male,84 female;61.2±9.2 years old)and placebo(n=80;46 male,34 female;63.2±8.28 years old)groups.All patients were given standard care once daily for 14 days,including a 200 mg aspirin enteric-coated tablet and 20 mg atorvastatin calcium,both taken orally,and intravenous infusion of 250–500 mL 0.9%sodium chloride containing 40 mg sodium tanshinone IIA sulfonate.Based on conventional treatment,patients in the CEGI and placebo groups were given 12 mL CEGI or 12 mL sterile water,respectively,in an intravenous drip of 250 mL 0.9%sodium chloride(2 mL/min)once daily for 14 days.According to baseline National Institutes of Health Stroke Scale scores,patients in the two groups were divided into mild and moderate subgroups.Based on the modified Rankin Scale results,the rate of patients with good outcomes in the CEGI group was higher than that in the placebo group,and the rate of disability in the CEGI group was lower than that in the placebo group on day 90 after treatment.In the CEGI group,neurological deficits were decreased on days 14 and 90 after treatment,as measured by the National Institutes of Health Stroke Scale and the Barthel Index.Subgroup analysis revealed that CEGI led to more significant improvements in moderate stroke patients.No drug-related adverse events occurred in the CEGI or placebo groups.In conclusion,CEGI may be a 展开更多
关键词 acute cerebral infarction Barthel Index CATTLE encephalon GLYCOSIDE and ignotin modified Rankin SCALE National Institutes of Health STROKE SCALE NEUROPROTECTANTS recovery rate STROKE
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