检索结果-南通市图书馆

鸡蛋在水貂营养中的应用——营养成分和消化率

在线全文

学校读者我要写书评

暂无评论

动物营养学报 1995年第1期7卷 10-14页

作者：贺建华 D. M. Aderson K. Rouvinen 湖南农业大学动物营养研究室长沙410128 Dept of Animal Science Nova Scotia Agricultural College P. O. Box 550 Truro Nova Scotia Canada B2N 5E3

在一个6×6的拉丁方设计中,用12只6月龄水貂研究了6种鸡蛋制品,即蛋粉(PE)、带壳生鸡蛋(RwS)、不带壳生鸡蛋(RWOS)、带壳熟鸡蛋(cws)、不带壳熟鸡蛋(CWOS)和煎鸡蛋(FE)的利用情况,测定了这6种鸡蛋制品的营养成分和能量消化率。研究结果... 详细信息

在一个6×6的拉丁方设计中,用12只6月龄水貂研究了6种鸡蛋制品,即蛋粉(PE)、带壳生鸡蛋(RwS)、不带壳生鸡蛋(RWOS)、带壳熟鸡蛋(cws)、不带壳熟鸡蛋(CWOS)和煎鸡蛋(FE)的利用情况,测定了这6种鸡蛋制品的营养成分和能量消化率。研究结果表明,水绍对鸡蛋能量、蛋白质和脂肪的消化率极高,分别在86.2％～95.6％,85.0％～95.6％和91.3％～97.1％之间。鸡蛋煮熟对蛋白质消化率无显著影响(P>0.05),但显著降低脂肪和能量的消化率(P<0.05);煎处理能显著提高不带壳鸡蛋的蛋白质消化率。根据本研究结果,在水貂日粮中使用15％的带壳生鸡蛋是可行的。

关键词：水貂鸡蛋消化率热处理

在线全文

学校读者我要写书评

暂无评论

城市湿地保护与修复研究进展

地理科学进展 2009年第2期28卷 271-279页

作者：李春晖郑小康牛少凤蔡宴朋沈楠庞爱萍北京师范大学环境学院水沙科学教育部重点实验室北京100875 北京师范大学环境学院水环境模拟国家重点实验室北京100875 浙江大学水文水资源工程所杭州310058 Faculty of Engineering University of ReginaReginaSKS4S 0A2Canada

城市湿地作为城市中一个特殊的生态系统,具有重要的生态环境和社会服务功能。城市湿地为实现城市可持续发展提供重要的水资源和生态环境保障,合理开发和利用湿地资源是城市可持续发展的重要前提。但是,随着城市化进程加快,城市湿地保护... 详细信息

城市湿地作为城市中一个特殊的生态系统,具有重要的生态环境和社会服务功能。城市湿地为实现城市可持续发展提供重要的水资源和生态环境保障,合理开发和利用湿地资源是城市可持续发展的重要前提。但是,随着城市化进程加快,城市湿地保护问题日益突出,一些不合理的湿地开发行为导致城市湿地面积减少、污染严重和湿地功能退化,削弱了湿地的生态效益和社会效益,城市湿地的保护与合理利用日益受到国际社会的重视。从城市湿地的功能出发,分析了城市湿地保护与修复中面临的主要问题,综述了国内外城市湿地修复的物理、化学和生物等相关技术研究进展,研究了国内外对于城市湿地保护的一些成功经验,并展望了城市湿地保护与修复研究趋势和方向。最后,结合我国城市湿地保护与修复现状,提出了我国城市湿地保护的对策与建议,为促进城市湿地生态系统的良性循环,推动整体湿地保护更好发展提供借鉴和参考。

关键词：城市湿地湿地保护湿地修复研究进展

锆石微量元素对成矿岩体的判别——来自大数据思维的应用

在线全文

学校读者我要写书评

暂无评论

地质通报 2019年第12期38卷 1992-1998页

作者：耿厅周永章李兴远王俊陈川王堃屹韩紫奇中山大学地球科学与工程学院广东广州510275 广东省地质过程与矿产资源探查重点实验室广东广州510275 中山大学地球环境与地球资源研究中心广东广州510275 中山大学地理科学与规划学院广东广州510275 Department of Geology University of ReginaReginaSaskatchewan S4S 0A2Canada 广东高质资源环境研究院广东广州510275

华南钦杭结合带燕山期岩浆活动异常活跃,且具有较明显的成矿专属性。近年来微区测试技术日益成熟,积累了大量锆石微量数据。通过全体数据挖掘的思维方法,对前人发表的数据进行了进一步数据挖掘,利用锆石稀土元素对岩体成矿潜力进行判别... 详细信息

华南钦杭结合带燕山期岩浆活动异常活跃,且具有较明显的成矿专属性。近年来微区测试技术日益成熟,积累了大量锆石微量数据。通过全体数据挖掘的思维方法,对前人发表的数据进行了进一步数据挖掘,利用锆石稀土元素对岩体成矿潜力进行判别,探讨有效的找矿地球化学标志。利用Python语言编程,对采用的13种稀土元素及元素比值进行穷举式组合,获得了4095个二元图解及121485个三元图解,并设计筛选算法,自动筛选出能有效区分锆石母岩成矿类型的图解。结果表明,锆石稀土元素含量及比值图解对不同成矿类型岩体的区分程度各异:与Ce、Eu有关的地球化学指标可以较清晰地对斑岩铜矿和钨锡(锡)矿床进行判别,这可能与岩体的氧逸度和含水量有关。此外,还挖掘出一些新的元素组合图解,如Dy/Lu-Er/Lu、Gd/Dy-Er/Yb等,可以有效区分岩体成矿类型,其隐含的地球化学机制尚待进一步解释。地球化学数据挖掘结果可以作为找矿标志使用,为华南燕山期岩浆-热液矿床研究及找矿勘查提供了科学依据,也是大数据技术在矿床学方面应用研究的积极探索。

关键词：锆石微量元素大数据分析地球化学图解钦杭结合带

稻田温室气体排放与土壤微生物菌群的多元回归分析

在线全文

学校读者我要写书评

暂无评论

生态学报 2012年第6期32卷 1811-1819页

作者：秦晓波李玉娥石生伟万运帆纪雄辉廖育林 Hong Wang 刘运通李勇中国农业科学院农业环境与可持续发展研究所北京100081 农业部农业环境与气候变化重点开放实验室北京100081 湖南省土壤肥料研究所长沙410125 SemiaridPrairieAgriculturalResearchCentre AgriculturalandAgri-FoodCanadaSwiftcurrentSaskatchewanS9H3X2Canada；中国科学院亚热带农业生态研究所长沙410125

为揭示多种田间管理措施综合影响下双季稻田温室气体平均排放通量与土壤微生物菌群的多元回归关系,利用静态箱—气相色谱法和稀释培养计数法进行了温室气体排放通量和土壤产气微生物菌群数量的连续观测。2a研究结果显示,稻田甲烷排放通... 详细信息

为揭示多种田间管理措施综合影响下双季稻田温室气体平均排放通量与土壤微生物菌群的多元回归关系,利用静态箱—气相色谱法和稀释培养计数法进行了温室气体排放通量和土壤产气微生物菌群数量的连续观测。2a研究结果显示,稻田甲烷排放通量与土壤微生物总活性和产甲烷菌数量关系密切,甲烷排放通量与二者的关系可分别由指数和二次多项式模型拟合。一元回归分析表明,仅产甲烷菌数量就能单独解释96.9%的稻田甲烷排放通量变异(R2=0.969,P<0.001),但考虑两种因素的二元回归拟合优度高于一元回归(R2=0.975,P<0.001)。氧化亚氮排放通量与土壤硝化细菌和反硝化细菌数量也密切相关(P<0.05),氧化亚氮排放通量与二者的二元非线性混合回归模型可以解释至少70.4%的稻田氧化亚氮排放通量(R2≥0.704,P<0.001),其拟合优度也高于一元回归。稻田温室气体排放通量受多种影响因素控制,土壤产气微生物活性和数量是多种因素影响的直接响应,因此二者与温室气体排放存在显著相关,基于田间试验的多元非线性回归分析客观的揭示了温室气体排放通量与环境因子的相关关系。

关键词：甲烷和氧化亚氮排放双季稻田稀释培养计数法产甲烷菌硝化细菌反硝化细菌多元回归

Production and Characterization of Green Biosorbent Based on Modified Corn Cob Decorated Magnetite Nanoparticles

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science and Chemical Engineering 2023年第2期11卷 1-12页

作者： N’guadi Blaise Allou N’goran Sévérin Eroi Mougo André Tigori Patrick Atheba Albert Trokourey Laboratoire de Constitution et Réaction de la Matière UFR SSMT Université Félix Houphouët Boigny Abidjan Côte d’Ivoire Laboratoire de Thermodynamique et de Physico-Chimie du Milieu UFR SFA Université Nangui Abrogoua Abidjan Cote d’Ivoire Laboratoire des Sciences et Technologies de l’Environnement UFR Environnement Université Jean Lorougnon Guédé Daloa Côte d’Ivoire Institut National de la Recherche Scientifique (INRS-ETE) Université du Québec Quebec City Canada

In most developing countries, particularly in the countries of sub-Saharan Africa, corn cobs are considered as waste polluting the environment during the harvest period of this cereal. In order to valorize this agricultural waste, high-performance, inexpensive and low-energy consumption magnetic bioadsorbents were prepared from corn cobs. The chemically activated raw corn cob was magnetized by coating the surface with magnetite nanoparticles. The prepared biosorbents were characterized by FT-IR, XRD, FE-SEM associated with EDX, HR-TEM, TG analysis, BET surface area analysis and XPS. The maximum specific surface area of 35.22 m2/g was reached. An attempt to use of these magnetic biosorbents for the removal of heavy metal like Cr(VI) from aqueous solution was envisaged.

关键词： Green Biosorbent Corn Cob Magnetite Nanoparticles Surface Chemistry NaOH Activation

Modeling the Hydrological Dynamic of the Breeding Water Bodies in Barkedji’s Zone

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2014年第8期6卷 741-755页

作者： Mamadou Bop Angelina Amadou Ousmane Seidou Cheikh Mouhamed Fadel Kébé Jacques André Ndione Soussou Sambou Ibrah Seidou Sanda Agrhymet Regional Center Niamey Niger Centre de Suivi écologique (CSE) Dakar Sénégal Centre International de Formation et de Recherche en Energie Solaire (CIFRES) Département de Génie Civil Ecole Supérieure Polytechnique Université Cheikh Anta Diop Dakar Sénégal Department of Civil Engineering University of Ottawa Ottawa Canada Laboratoire d’Hydraulique et de Mécanique des Fluides Département de Physique Faculté des Sciences et Techniques Université Cheikh Anta Diop de Dakar Dakar Sénégal

Temporary water bodies’ dynamics play an important role in the epidemiological chain-borne diseases such as Rift Valley fever as they are the main breeding habitats for mosquitoes. During the rainy season, hundreds of these temporary water bodies appear and grow in the Ferlo region (Senegal). The purpose of this research is to generate historical and future time series water levels and areas at three temporary ponds located in the environment and health observatory of Barkedji. A simple lumped hydrological model was developed for that purpose. It describes each pond watershed as three interconnected reservoirs: canopy, surface storage and soil storage and uses a linear relation to describe infiltration, percolation and baseflow (out of the soil reservoir). Given the depth of the water table in the region, percolation out of the soil surface is considered lost. Evapotraspiration was calculated using the Penman equation and withdraws water from the canopy and surface water reservoirs. Excess runoff from the soil storage is turned into runoff using a triangular unit hydrograph. The calibration was done using two years of hydrological and climatic data collected during the 2011 and 2012 rainy seasons. The calibration was successful and water level in the two ponds was simulated with a Root Mean Square Error (RMSE) of 11.2 to 15 cm. Because of the short duration of the observation, no validation could be done. Given the excellent agreement of the simulated and observed water levels during the calibration phase, the modeling exercise was considered to be successful. The developed models were used to generate historical time series of pond areas and correlate these to mosquitoes’ infestation in the region. Future time series of pond areas were also generated using downscaled outputs of three regional climate models from the AMMA ENSEMBLES experiment. The generated pond levels and areas are being used to assess the evolution of the disease in the next 40 years.

关键词： Breeding Areas Hydrology Pond Dynamics Climate Change

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

Preface

Science China Chemistry 2011年第8期54卷 1155-1156页

作者：陈洪渊 HuangXian Ju Chinese Acad Sci Beijing 100864Peoples R China Nanjing Univ NanjingPeoples R China Univ Montreal MontrealPQ H3C 3J7Canada

The 21st century is witnessing rapid progress in the areas of life science and biotechnology. It is therefore increasingly important to detect and quantify biologically essential mol-ecules not only in scientific rese... 详细信息

关键词：生物技术领域序言食品加工业生命科学 MOL

Fungal contaminations of indoor and outdoor air of buildings of the University of Cape Coast,Ghana

在线全文

学校读者我要写书评

暂无评论

Studies in Fungi 2018年第1期3卷 333-342页

作者： Yafetto L Adator EH Department of Molecular Biology and Biotechnology School of Biological SciencesCollege of Agriculture and Natural SciencesUniversity of Cape CoastCape CoastGhana Department of Food Science Faculty of Agriculture and Food SciencesUniversity of ManitobaWinnipegCanada

The presence of microscopic spores in the air affects the quality of air inhaled by animals including *** contamination of air impacts the well-being of occupants of an indoor environment,sometimes with dire *** study investigated fungal contaminations of indoor and outdoor air of the Hospital,Library and Senior Common Room(SCR)of the University of Cape Coast,*** and outdoor air was sampled using the Koch’s sedimentation *** forming units per cubic meter of air(cfu/m^(3))were determined with the Omeliansky *** isolated fungi were identified based on morphological and growth *** indoor air,the least colony counts were recorded in the SCR for both morning and afternoon samples,whilst the Hospital air had the highest colony *** outdoor air,the colony counts were lower in SCR and the Library for both morning and afternoon samples compared to the *** results further indicated that indoor concentrations of fungi,for morning and afternoon,ranged between 4.0x10^(4) and 2.1x10^(5) cfu/m^(3),whereas outdoor concentrations of fungi ranged between 1.1x105 and 3.0x10^(5) cfu/m^(3),revealing an overall higher levels of contamination of outdoor air than indoor air at all the three ***,estimated indoor/outdoor(I/O)concentration ratios of fungi revealed an exogenous source of indoor contaminations at all the three buildings *** isolated from indoor and outdoor air were of the genera Aspergillus,Curvularia,Cylindrocarpon,Fusarium,Mucor,Neurospora,Penicillium and *** conclude that indoor and outdoor air of the buildings sampled were contaminated with airborne fungi;however,based on estimated I/O ratios,the indoor ambient conditions of the buildings were *** implication of findings of this study is that the presence of airborne fungal contaminants of indoor and outdoor workplace environment may pose serious occupational health consequences,hence low producti

关键词： airborne fungi Ghana indoor air quality microbial contaminants occupational health workplace environment

多过程耦合动力学数值模拟在热液矿床研究中的应用及发展前景

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

大地构造与成矿学 2021年第6期45卷 1146-1160页

作者：黄沁怡李增华许德如池国祥邓腾赵朝霞于得水中国科学院广州地球化学研究所矿物学与成矿学重点实验室广东广州510640 中国科学院大学北京100049 东华理工大学江西省放射性地学大数据技术工程实验室江西南昌330013 东华理工大学核资源与环境国家重点实验室江西南昌330013 Department of Geology University of ReginaRegina S4S 0A2Canada

热液矿床的形成是一个复杂的多因素耦合过程,包括传热、流体运移以及物质的传输和沉淀。近年来,随着计算机技术和计算数学的发展,多过程耦合动力学数值模拟在成矿研究中的应用越来越深入,主要模拟成矿系统中的热传递、流体流动、构造变... 详细信息

热液矿床的形成是一个复杂的多因素耦合过程,包括传热、流体运移以及物质的传输和沉淀。近年来,随着计算机技术和计算数学的发展,多过程耦合动力学数值模拟在成矿研究中的应用越来越深入,主要模拟成矿系统中的热传递、流体流动、构造变形和化学反应过程以及它们之间的相互作用。本文首先介绍了数值模拟的基本方法、常用的数值模拟软件及其应用范围,其次总结了多过程耦合动力学数值模拟在热液成矿理论研究和成矿预测中的应用,最后总结了数值模拟的优缺点并讨论其发展趋势。数值模拟是解决一些成矿问题的有效分析工具,将会推动矿床研究从定性、半定量往定量的方向转变。

关键词：数值模拟数值模拟软件成矿作用耦合动力学