检索结果-南通市图书馆

光伏电站建设对陆地生态环境的影响:研究进展与展望

在线全文

学校读者我要写书评

暂无评论

环境科学 2024年第1期45卷 239-247页

作者：田政卿张勇刘向陈生云柳本立吴纪华兰州大学生态学院草种创新与草地农业生态系统全国重点实验室兰州730000 中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室兰州730000 中国科学院西北生态环境资源研究院沙漠与沙漠化重点实验室兰州730000

随着全球能源消耗的快速增长,环境将进一步恶化,各国减排的竞争将更加激烈,而利用太阳能作为清洁能源的光伏发电对于实现地球碳中和具有重要战略意义.陆地生态系统中的集中式光伏电站大范围覆盖地球表面,导致土地利用发生变化,对地表能... 详细信息

随着全球能源消耗的快速增长,环境将进一步恶化,各国减排的竞争将更加激烈,而利用太阳能作为清洁能源的光伏发电对于实现地球碳中和具有重要战略意义.陆地生态系统中的集中式光伏电站大范围覆盖地球表面,导致土地利用发生变化,对地表能量平衡和降水的再分配产生显著影响,进而改变土壤养分循环和植物生产力,并最终带来明显的生态环境效应.通过回顾近20年来国内外光伏电站生态环境影响研究的相关文献,综述了光伏电站建设对微气候、土壤和动植物等的影响强度和方向,以及对陆地生态系统功能的潜在影响.光伏电站可以通过调节微气候因子中的太阳辐射强度、空气温湿度、风速和风向等,进一步影响植物生产力、土壤抗蚀性和土壤碳固存等多项生态系统功能.尽管已有文献报道中有关光伏电站建设对陆地生态系统的影响并不一致,但总体而言,可以提高植被盖度和植物生产力;特别在荒漠等生态系统中可在一定程度上改善生态环境.目前,尽管有大量研究报道了光伏电站对生态系统可能具有的效应,但实验性论据尚不充分,对生态系统功能影响机制的研究更为少见.在后续的工作中,可进一步关注光伏电站对生态环境影响的区域差异性,以及对生态系统功能潜在的影响途径,结合生态效应为光伏电站建设区域的生态保护与修复提供依据,并针对潜在的生态风险制定相应预案措施.

关键词：光伏电站生态效应微气候因子植物多样性土壤生态系统

Soil quality assessment for desertification based on multi-indicators with the best-worst method in a semi-arid ecosystem

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2023年第7期15卷 779-796页

作者： Orhan DENGİZ İnci DEMİraĞTUraN Department of Soil Science and Plant Nutrition Faculty of AgricultureOndokuz Mayıs UniversitySamsun-55139Turkey Department of Geography Faculty of EconomicAdministrative and Social SciencesSamsun UniversitySamsun-55030Turkey

Since there are some signs of land degradation and desertification showing how soil sustainability is threatened, it is crucial to create a soil quality index(SQI) model in the semi-arid ?orum Basin, situated between the Black Sea and Anatolia Region, Central Turkey. The primary aims of the study are:(1) to determine SQI values of the micro-basin in terms of land degradation and ***, the best-worst method(BWM) was used to determine the weighting score for each parameter;(2) to produce the soils' spatial distribution by utilizing different geostatistical models and GIS(geographic information system) techniques;and(3) to validate the obtained SQI values with biomass reflectance values. Therefore, the relationship of RE-OSAVI(red-edge optimized soil-adjusted vegetation index) and NDVI(normalized difference vegetation index) generated from Sentinel-2A satellite images at different time series with soil quality was examined. Results showed that SQI values were high in the areas that had almost a flat and slight slope. Moreover, the areas with high clay content and thick soil depth did not have salinity problems, and were generally distributed in the middle parts of the basin. however, the areas with a high slope, poor vegetation, high sand content, and low water holding capacity had low SQI ***, a statistically high positive correlation of RE-OSAVI and NDVI indices with soil quality was found, and NDVI had the highest correlative value for June(R~2=0.802) compared with RE-OSAVI.

关键词： soil quality land degradation desertification best-worst method remote sensing

Epidemiological and Diagnostic Profile of Patients with Chronic Hepatitis B Virus from 2017 to 2021 in Parakou, Republic of Benin

在线全文

学校读者我要写书评

暂无评论

Advances in Infectious Diseases 2024年第1期14卷 147-161页

作者： Khadidjatou Saké Cossi Angelo Attinsounon Aboudou raϊmi Kpossou Morayo Omm Ani Salami Astrid Alexandrine hountondji Kofi-Mensa Savi de Tovè Rhonel Ahanhanzo-Glèlè Kpémahoun René Kèkè Sossa Edmond Gbédo Jean Sehonou Nicolas Kodjoh Department of Medicine and Medical Specialties Faculty of Medicine University of Parakou Parakou Benin Department of Medicine and Medical Specialties Faculty of Health Sciences University of Abomey-Calavi Cotonou Benin Health Program to Fight AIDS Cotonou Benin National Program for the Control of Hepatitis Cotonou Benin

Introduction: Viral hepatitis B is a public health problem worldwide. The objective of this study was to determine the epidemiological and diagnostic profile of chronic carriers of hepatitis B virus seen for gastroenterology consultations in Parakou, Republic of Benin. Patients and Methods: This was a cross-sectional and descriptive study with retrospective data collection. Patients seen for gastroenterology consultations from January 1, 2017 to June 30, 2021 at the Regional Teaching hospital of Borgou/Alibori (CHUD-B/A) and having been diagnosed as chronic carriers of hepatitis B virus were included. A minimum initial assessment was required to be included. The minimum sample size was calculated with Schwartz formula. The variable of interest was the detection of HBsAg twice and at least 6 months apart. The other variables studied were sociodemographic, clinical and paraclinical data. The data collected were analyzed using SPSS 17 software. Results: A total of 2786 patients were seen for gastroenterology consultations, including 1126 (40.4%) HBsAg-positive patients. Among them, 417 patients met the inclusion criteria and were the subject of the present study. The average age of the patients was 34.8 ± 10.5 years. Two hundred and forty-seven patients (65.7%) were male, representing a sex ratio of 1.9. The discovery of positive HBsAg status was made during systematic screening in 231 patients (55.4%). Scarifications were noted in 373 patients (89.4%). Asthenia was reported in 184 patients (44.1%). Co-infections with human immunodeficiency virus, hepatitis C and D viruses were 0% (0 in 92), 2.8% (4 in 146) and 14.3% (2 in 146), respectively. During the initial assessment, 274 patients (65.7%) were sero-negative for chronic HBeAg infection, 21 (5%) had clinically significant fibrosis including 16 (3.8%) at the stage of cirrhosis and 7 patients (5.4%) had hepatocellular carcinoma. Conclusion: In Parakou, chronic hepatitis B virus infection is common and affects young pe

关键词： Chronic Infection HBV Epidemiology Diagnosis Parakou

考虑条件风险价值的交直流系统两阶段分布鲁棒低碳经济优化调度

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

高电压技术 2024年第1期50卷 157-168页

作者：曾子龙李培强李勇钟俊杰曹一家湖南大学电气与信息工程学院长沙410082

考虑到海上风电出力的随机性以及日益突出的生态环境问题,以含柔性直流输电技术(voltagesource converter high voltage direct current,VSC-HVDC)的交直流系统为研究对象,提出了考虑条件风险价值(conditional valueatrisk,CVaR)的两阶... 详细信息

考虑到海上风电出力的随机性以及日益突出的生态环境问题,以含柔性直流输电技术(voltagesource converter high voltage direct current,VSC-HVDC)的交直流系统为研究对象,提出了考虑条件风险价值(conditional valueatrisk,CVaR)的两阶段分布鲁棒低碳经济优化模型,构建了基于Kullback-Leibler(KL)散度的概率分布模糊集,同时利用条件风险价值量化了极端场景下的尾部风险,使得模型能够同时考虑概率分布不确定性以及处于最坏概率分布中极端场景下的尾部损失;此外,将阶梯型碳交易机制并入所提分布鲁棒模型中,通过合理利用柔性资源和储能装置,增强系统运行的灵活性,在兼顾运行风险的前提下,降低碳排放量的目标。再者,为了提高计算效率,在列和约束生成算法(column-and-constraint generation method,C&CG)和Multi-cut Benders分解算法的基础上提出了双循环分解算法。最后,在基于改进的IEEE RTS 79测试系统中验证了所提模型及算法的有效性。

关键词：低碳阶梯型碳交易条件风险价值分布鲁棒优化交直流系统列和约束生成算法

Emphysematous Cystitis: Report of Two Cases and Review of the Literature

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Health 2024年第4期16卷 309-318页

作者： Roland Bertile Banga-Mouss Nestor Ghislain Andzouana Mbamognoua Yanick Dimi Nyanga Armel Melvin Atipo Ondongo Steve Aristid Ondziel-Opara raïssa Laure Mayanda Ohouanda Nick Arnaud Monabeka Evariste Bouenizabila Anani Séverin Wences Odzébé Prosper Alain Bouya Urology Department University Hospital of Brazzaville Brazzaville Republic of the Congo Faculty of Health Sciences Marien Ngouabi University Brazzaville Republic of the Congo Department of Metabolic and Endocrine Diseases University Hospital of Brazzaville Brazzaville Republic of the Congo

Emphysematous cystitis is a rare complication of lower urinary tract infection whose prognosis is conditioned by the delay in treatment. The predisposition of diabetic patients to urinary infections caused by gas-producing bacteria is considered one of the most common factors in the occurrence of emphysematous cystitis. The currently recommended diagnostic test is CT scanning, which has definite value in assessing gas accumulation in the bladder wall and lumen. The authors report the observations of two patients aged 68 and 80 who were treated for emphysematous cystitis complicating diabetes mellitus. The evolution was favorable under treatment with antibiotic therapy, insulin therapy and bladder drainage.

关键词： Emphysematous Cystitis Computed Tomography Lower Urinary Tract Infection Diabetes Mellitus

密盖息联合克氏针固定治疗骨质疏松性桡骨远端骨折的临床疗效及对愈合时间的影响

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

中国现代药物应用 2024年第12期18卷 63-66页

作者：陈永光闽侯县医院骨科 350100

目的分析鲑鱼降钙素注射液(商品名:密盖息)联合克氏针固定治疗骨质疏松性桡骨远端骨折的临床疗效和对愈合时间的影响。方法80例骨质疏松性桡骨远端骨折患者,通过随机数字抽签方式分为对照组和观察组,各40例。对照组进行克氏针固定治疗,... 详细信息

目的分析鲑鱼降钙素注射液(商品名:密盖息)联合克氏针固定治疗骨质疏松性桡骨远端骨折的临床疗效和对愈合时间的影响。方法80例骨质疏松性桡骨远端骨折患者,通过随机数字抽签方式分为对照组和观察组,各40例。对照组进行克氏针固定治疗,观察组在此基础上联合密盖息治疗。对比两组患者治疗前后Barthel指数、视觉模拟评分法(VAS)评分、临床疗效、关节恢复情况。结果两组患者治疗前的Barthel指数、VAS评分对比差异不存在统计学意义(P>0.05);治疗后,观察组的Barthel指数(83.27±7.37)分高于对照组的(72.74±6.16)分,对比差异存在统计学意义(P0.05)。结论在骨质疏松性桡骨远端骨折的治疗中应用密盖息联合克氏针固定,能减轻患者的疼痛感,缩短骨愈合时间,促进机体恢复。

关键词：鲑鱼降钙素注射液克氏针固定骨质疏松性桡骨远端骨折

慢性前列腺炎/慢性盆腔疼痛综合征中医药治疗研究进展

在线全文

学校读者我要写书评

暂无评论

中国中药杂志 2024年第10期49卷 2648-2653页

作者：李生龙卢刚刚赵渊博龚美胜马旭赵永强贾云鹏梁永林甘肃中医药大学中西医结合学院甘肃兰州730000 黑龙江省中医药科学院研究生院黑龙江哈尔滨150006 甘肃省中医院泌尿外科甘肃兰州730050 甘肃中医药大学基础医学院甘肃兰州730000

慢性前列腺炎/慢性盆腔疼痛综合征(chronic prostatitis/chronic pelvic pain syndrome,CP/CPPS)是一种常见的泌尿外科疾病,其病因十分复杂,西医治疗效果欠佳,病程迁延不愈,给患者带来很大困扰。中医药在辨证论治基础上,治疗该疾病的方... 详细信息

慢性前列腺炎/慢性盆腔疼痛综合征(chronic prostatitis/chronic pelvic pain syndrome,CP/CPPS)是一种常见的泌尿外科疾病,其病因十分复杂,西医治疗效果欠佳,病程迁延不愈,给患者带来很大困扰。中医药在辨证论治基础上,治疗该疾病的方式众多,采用中药内治、针灸推拿及其他外治疗法以综合治疗,效果显著。该研究对CP/CPPS的发病机制、病因病机及中医药治疗研究进展进行综述,发现西医对CP/CPPS病因病理及发病机制不能完全阐明,认为主要与特殊病原体感染、排尿功能障碍、精神心理异常、神经内分泌异常、免疫异常、氧化应激过强、盆腔疾病及遗传等诸多因素相关。中医则认为是由湿热、瘀血、气滞及毒浊所致,并与肝、脾、肾、肺、胃、膀胱等脏腑和冲任二脉、足三阴经等经络密切相关。在中医药治疗中,目前多采用中药内治(汤药、中成药及各著名医家的疗法)、针灸推拿治疗及其他外治方式(直肠给药、中药溻渍、中药坐浴熏洗、耳穴贴压等)相结合的综合治疗方案,进行全面综合调理,临床疗效显著,中医药特色突出,值得临床推广。该文旨在为临床防治CP/CPPS提供参考,并为该领域未来的研究提供潜在方向。

关键词：慢性前列腺炎慢性盆腔疼痛综合征中医药研究进展综述

Stellar structure model in hydrostatic equilibrium in the context of f(R)-gravity

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2017年第12期17卷 31-40页

作者： raíla Andr Gilberto M.Kremer Departamento de Fisica Universidade Federal do Parana81531-980 CuritibaBrazil Manipal Centre for Natural Sciences Manipal UniversityManipal 576104India

In this work we present a stellar structure model from the f（R）-gravity point of view capable of describing some classes of stars（white dwarfs, brown dwarfs, neutron stars, red giants and the Sun）. This model is based on f（R）-gravity field equations for f（R） = R ＋ f2R2, hydrostatic equilibrium equation and a polytropic equation of state. We compare the results obtained with those found by Newtonian theory. It has been observed that in these systems, where high curvature regimes emerge,stellar structure equations undergo modifications. Despite the simplicity of this model, the results are satisfactory. The estimated values of pressure, density and temperature of the stars are within those determined by observations. This f（R）-gravity model has proved to be necessary to describe stars with strong fields such as white dwarfs, neutron stars and brown dwarfs, while stars with weaker fields, such as red giants and the Sun, are best described by Newtonian theory.

关键词： cosmology:theory stars:general massive brown dwarfs white dwarfs neutron

Periodic Solutions of Evolution Variational Inequalities—a Method of Guiding Functions

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2009年第3期30卷 261-272页

作者： Samir ADLY Daniel GOELEVEN Michel THra Département de Math'ematiques et Informatique Laboratoire XLIM(Unité Mixte 6172 du CNRS)Université de Limoges123 Avenue A.Thomas87060 Limoges CedexFrance. Laboratoire d' Informatique et de Mathématiques Université de La Réunion97400 Saint-DenisFrance.

This paper focuses on a part of the presentation given by the third author at the Shanghai Forum on Industrial and Applied Mathematics(Shanghai 2006).It is related to the existence of a periodic solution of evolution ... 详细信息

关键词： Variational inequality Differential inclusion Topological degree Guiding function Periodic solution