检索结果-内蒙古大学图书馆

Mineralogy of rare metal mineralization from Abu Rusheid granitic gneisses and surrounding stream sediments, South Eastern Desert, Egypt

引用

World of Mining - Surface and Underground 2020年第4期72卷 211-219页

作者： Raslan, Mohamed F. El-Sayed Seleman, Mohamed M. Omran, Mamdouh Z. El-Kheshen, Amany A. Shoeir, Rasha H. Nuclear Materials Authority Cairo Egypt Suez University P.O. Box 43518 Suez Egypt Metallurglcal and Materials Engineering Department Faculty of Petroleum and Mining Engineering Suez University Al-Salam 1 P.O. Box 43518 Suez Egypt Process Metallurgy Research Group Faculty of Technology University of Oulu Finland Mineral Processing and Agglomeration Lab Central Metallurgical Research and Development Institute Cairo Egypt Glass Research Department National Research Centre Dokki Cairo12622 Egypt

A large assemblage of precious rare-metal mineralization is detected in both the granitic gneiss and its surrounding stream sediments of Abu Rusheid locality, Southern Eastern Desert of Egypt. XRF analyses of the bulk samples indicated that both granitic gneiss and stream sediment samples are enriched in Zr, Nb, and Y. The average content of Zr, Nb, and Y are 3444 ppm, 1079 ppm and 251 ppm for granitic gneiss samples however;they are 1775 ppm, 3335 ppm and 265 ppm for the stream sediments samples respectively. Detailed microscopic examination, X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) were used to characterize the studied minerals. The analyses of several separated grains using SEM and XRD revealed the presence of zircon, Nb-Ta oxide minerals (columbite, ishikawaite, betafite, and fergusonite), uranophane, uranothorite, cassiterite, monazite, rutile, and ilmenite. Besides, native gold, nickel, and mineralization of Bl, Pb, Cu, Zn, Fe, and Cr were detected in the granitic gneiss samples. Based on the results so far, it can be stated that the studied granitic gneiss and its associated stream sediments contain anomalous potentiality for U, Th, Nb, Ta, Zr, Hf, and rare earth elements (REEs). Zircon of the investigated gneiss and stream sediments contains high hafnium content ranging between 2.72 and 5.74 %. This revealed that the studied zircon was assigned as Hf-rich zircon. © 2020 GDMB Gesellschaft fur Bergbau, Metallurgie, Rohstoff- und Umwelttechnik e.V.. All rights reserved.

关键词： Zircon

来源：评论

学校读者我要写书评

暂无评论

SENSITIVITY ANALYSIS OF BUILDING ENERGY PERFORMANCE BASED ON POLYNOMIAL CHAOS EXPANSION

引用

Journal of Green Building 2020年第4期15卷 173-183页

作者： Wei Tian Chuanqi Zhu Pieter de Wilde Jiaxin Shi Baoquan Yin College of Mechanical Engineering Tianjin University of Science and TechnologyTianjinChina300222 Tianjin International Joint Research and Development Center of Low-Carbon Green Process Equipment Tianjin 300222China Chair of Building Performance Analysis University of PlymouthPlymouthDevon PL48AAUnited Kingdom Tianjin Architecture Design Institute TianjinChina300074

Global sensitivity analysis based on polynomial chaos expansion(PCE)shows interesting characteristics,including reduced simulation runs for computer models and high interpretability of sensitivity *** paper explores these features of the PCE-based sensitivity analysis using an office building as a case study with the EnergyPlus simulation *** results indicate that the predictive performance of PCE models is closely correlated with the stability of the sensitivity index,depend-ing on sample number and expansion ***,it is necessary to carefully assess model accuracy of PCE models and evaluate convergence of the sensitivity index when using PCE-based sensitivity *** is also found that more simula-tion runs of building energy models are required for a higher expansion degree of the PCE model to obtain a reliable sensitivity index.A bootstrap technique with a random sample can be used to construct confidence intervals for sensitivity indicators in building energy assessment to provide robust sensitivity rankings.

关键词： sensitivity analysis building energy polynomial chaos expansion model accuracy

来源：评论

学校读者我要写书评

暂无评论

Mathematical model for autoregulated miRNA biogenesis

arXiv

引用

arXiv 2020年

作者： Nyayanit, Dimpal A. Gadgil, Chetan J. Chemical Engineering and Process Development Division CSIR-National Chemical Laboratory Dr. Homi Bhabha Road Pune Maharashtra411008 India Academy of Scientific and Innovative Research CSIR-NCL Pune411008 India CSIR-Institute of Genomics and Integrative Biology Mathura Road New Delhi110020 India

MicroRNAs are small non-coding nucleotide sequences that regulate target protein expression at post-transcriptional levels. Biogenesis of microRNA is a highly regulated multi-step pathway. Regulation of miRNA biogenesis can be caused directly by the components of the biogenesis pathway or indirectly by other regulators. In this study, we have built a detailed mathematical model of microRNA biogenesis to investigate the regulatory role of biogenesis pathway components. We extended a previous model to incorporate Microprocessor regulation of DGCR8 synthesis, exportin-mediated transport to the cytoplasm, and positive auto-regulation catalysed by mature miRNA translocation into the nucleus. Our simulation results lead to three hypotheses (i) Biogenesis is robust to Dicer protein levels at higher Exportin protein levels;(ii) Higher miRNA transcript formation may lead to lower RISC levels: an optimal level of both precursor miRNA and Dicer is required for optimal miRNA formation at lower levels of Exportin protein;and (iii) The positive auto-regulation by mature miRNA translocation into the nucleus can decrease the net functional cytoplasmic miRNA. Wherever possible, we compare these results to experimental observations not used in the model construction or calibration. Copyright © 2020, The Authors. All rights reserved.

关键词： RNA

来源：评论

学校读者我要写书评

暂无评论

Erratum: Additive-mediated intercalation and surface modification of MXenes (Chem. Soc. Rev. (2022) DOI: 10.1039/d0cs01487g)

引用

Chemical Society Reviews 2022年

作者： Zou, Jing Wu, Jing Wang, Yizhou Deng, Fengxia Jiang, Jizhou Zhang, Yizhou Liu, Song Li, Neng Zhang, Han Yu, Jiaguo Zhai, Tianyou Alshareef, Husam N. School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of Education Engineering Research Center of Phosphorus Resources Development Utilization of Ministry of Education Wuhan Institute of Technology Hubei Wuhan430205 China Key Laboratory of Rare Mineral Ministry of Natural Resources Geological Experimental Testing Center of Hubei Province Hubei Wuhan430034 China Thuwal23955-6900 Saudi Arabia State Key Laboratory of Urban Water Resources and Environment School of Environment Harbin Institute of Technology Harbin150090 China School of Chemistry and Materials Science Nanjing University of Information Science & Technology Nanjing210044 China Key Laboratory for Organic Electronics & Information Displays Institute of Advanced Materials Nanjing University of Posts and Telecommunications Nanjing210023 China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha410082 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Hubei Wuhan430070 China Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics Key Laboratory of Optoelectronic Devices and Systems Ministry of Education and Guangdong Province Shenzhen University Shenzhen518060 China State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China

In the original article, the author affiliation for Jiaguo Yu was incorrect. The correct affiliations are as shown here. The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to a...

关键词：

来源：评论

学校读者我要写书评

暂无评论

Front Cover: A Recent Progress for the Synthesis of Thiocarboxylates (Eur. J. Org. Chem. 25/2022)

引用

European Journal of Organic Chemistry 2022年第25期2022卷

作者： Xi Wang Prof. Dr. Zhi-Bing Dong School of Chemistry and Environmental Engineering Wuhan Institute of Technology Wuhan 430205 China School of Chemistry and Chemical Engineering Henan Normal University Xinxiang 453007 China Key Laboratory of Green Chemical Process Ministry of Education Wuhan Institute of Technology Wuhan 430205 China Hubei Key Laboratory of Biologic Resources Protection and Utilization Hubei Minzu University Enshi 445000 China Engineering Research Center of Phosphorus Resources Development and Utilization Ministry of Education Wuhan Institute of Technology Wuhan 430205 China

来源：评论

学校读者我要写书评

暂无评论

Niobium addition effect in molds at last cooling step on EN-GJL250 gray cast iron: Microstructural changes and electrochemical behavior

引用

China Foundry 2018年第3期15卷 228-235页

作者： M.O.Azzoug N.Boutarek-Zaourar D.Aboudi N.Madaoui E.Mossang S.Chentouf Laboratory of Materials Technology Faculty of Mechanical Engineering and Process EngineeringUniversity of Science and Technology Houari Boumediene Ionized Media Division Center for Advanced Technology Development CDTA NEEl Institute National Center for Scientific Research Department of Mechanical Engineering School of Technology Superior

The purpose of this study was to determine the impact of niobium addition as an inoculation element on the microstructure and electrochemical properties of EN-FGL250 gray cast iron. Niobium additions are in a powder form and have a 0.5 mm particle size at dfferent proportions of 1 wt.% and 3 wt.%. The addition was done during casting of the metal in the mold at the last cooling step of the melt cast iron. These additions have a significant impact on the phenomenon of solidifi cation as the metal powder deposited in the sand molds creates new centers of germination and absorbs a lot of heat. The cooling rate directly affects the microstructure and electrochemical behavior. This is confirmed by SEM observations and electrochemical tests. Furthermore, the addition of niobium transforms the microstructure of gray cast iron from cellular structure into totally dendritic structure. As a consequence, the niobium addition affected the shape and size of graphite, thus considerably reducing the corrosion current density by increasing the polarization resistance Rp.

关键词： Lamellar cast iron microstructure lamellar graphite shapes niobium inoculation corrosion resistance

来源：评论

学校读者我要写书评

暂无评论

Sustainable Natural Solar Drying of Microbreweries Spent Grains: A Comparison with Common Electric Convective Drying

引用

IOP Conference Series: Earth and Environmental Science 2022年第1期952卷

作者： MP Fabani JP Capossio A Reyes-Urrutia R Rodriguez G Mazza Biotechnology Institute Faculty of Engineering National University of San Juan. 1109 Av. Libertador San Martin (O) St. J5400ARL San Juan Argentina Institute for Research and Development in Process Engineering Biotechnology and Alternative Energies (PROBIEN CONICET – National University of Comahue) 1400 Buenos Aires St. 8300 Neuquén Argentina Chemical Engineering Institute Faculty of Engineering National University of San Juan. Research Group associated with PROBIEN Institute. 1109 Av. Libertador San Martín (O) St. J5400ARL San Juan Argentina

In recent years, local microbreweries are increasingly capturing the consumer's interest with a wide range of different types of beer. Because of the insertion of microbreweries scattered around the country, large amounts of spent grains have been made available locally to be used, for instance, as animal feed. However, those spent grains, which are mainly formed by malting barley (or malt), are materials suitable for further valorization. Turning the spent grains from waste to a raw material that can be later used to produce non-traditional flour requires a thermal treatment, i.e. a drying process. A natural convection solar dryer (NCSD) was evaluated as an alternative to a conventional convective electric drying system for the dehydration process of local microbrewer's spent grains. Two types of breweries' spent grains-BSG-(Golden Ale and Red Ale) were dried at different daytime hours. Sustainability indexes, Specific Energy Consumption (SEC), and CO2 emissions of the conventional dryer were calculated and used to determine the environmental benefits and drawbacks of the NCSD.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The forefront of chemical engineering research

Nature Chemical Engineering

引用

Nature Chemical engineering 2024年第1期1卷 18-27页

作者： Laura Torrente-Murciano Jennifer B. Dunn Panagiotis D. Christofides Jay D. Keasling Sharon C. Glotzer Sang Yup Lee Kevin M. Van Geem Jean Tom Gaohong He Department of Chemical Engineering and Biotechnology University of Cambridge Cambridge UK Chemical and Biological Engineering Center for Engineering Sustainability and Resilience Northwestern University Evanston IL USA Department of Chemical and Biomolecular Engineering University of California Los Angeles Los Angeles CA USA Department of Chemical & Biomolecular Engineering University of California Berkeley Berkeley CA USA Department of Bioengineering University of California Berkeley Berkeley CA USA California Institute of Quantitative Biosciences (QB3) University of California Berkeley Berkeley CA USA Division of Biological Systems and Engineering Lawrence Berkeley National Laboratory Berkeley CA USA Joint BioEnergy Institute Emeryville CA USA Center for Biosustainability Danish Technical University Lyngby Denmark Center for Synthetic Biochemistry Shenzhen Institutes for Advanced Technologies Shenzhen China Department of Chemical Engineering University of Michigan Ann Arbor MI USA Metabolic and Biomolecular Engineering National Research Laboratory Systems Metabolic Engineering and Systems Healthcare Cross-Generation Collaborative Laboratory Department of Chemical and Biomolecular Engineering (BK21 four) BioProcess Engineering Research Center Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea Laboratory for Chemical Technology Department of Materials Textiles and Chemical Engineering Faculty of Engineering and Architecture Ghent University Ghent Belgium Chemical Process Development Global Product Development and Supply Bristol Myers Squibb New Brunswick NJ USA State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and Technology School of Chemical Engineering Panjin Institute of Industrial Technology Liaoning Key Laboratory of Chemical Additive Synthesis and Separation Dalian University of Technology Dalian Liaoning China

来源：评论

学校读者我要写书评

暂无评论

Correction: Mechanisms of Mg carbonates precipitation and implications for CO2 capture and utilization/storage

引用

Inorganic Chemistry Frontiers 2023年第8期10卷 2493-2493页

作者： Hellen S. Santos Hoang Nguyen Fabricio Venâncio Durgaprasad Ramteke Ron Zevenhoven Paivo Kinnunen Fibre and Particle Engineering Research Unit University of Oulu Pentti Kaiteran katu 1 90570 Oulu Finland Development Center of Real Time Chemical Processes and Analyses (NQTR) Institute of Chemistry Federal University of Rio de Janeiro Rua Hélio de Almeida 40 Cidade Universitária da Universidade federal do Rio de Janeiro 21941-614 Rio de Janeiro-RJ Brazil Process and Systems Engineering Laboratory Åbo Akademi University Henrikinkatu 2 20500 Turku Finland

Correction for ‘Mechanisms of Mg carbonates precipitation and implications for CO2 capture and utilization/storage’ by Hellen S. Santos et al., Inorg. Chem. Front., 2023, https://***/10.1039/d2qi02482a.

Correction for ‘Mechanisms of Mg carbonates precipitation and implications for CO₂ capture and utilization/storage’ by Hellen S. Santos et al., Inorg. Chem. Front., 2023, https://***/10.1039/d2qi02482a.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Comprehensive control model of soil and water conservation in Pisha stone area

Comprehensive control model of soil and water conservation i...

引用

作者： Zhenzhou Shen Wenyi Yao Peiqing Xiao Mian Li Liangyi Rao Xiaolong Li Changing Li Weiweichen Yan wu Jishan yang Chengran Jing Peng Jiao Haoyu Yang Pan Zhang Zhihui Wang Hongzhe Bao Er Yang Key Lab of Soil Water Loss Process and Control on the Loess Plateau of the MWR Yellow River Institute of Hydraulic Research Yellow River Basin Ecological Protection and High-Quality Development Institute YRCC College of Soil and Water Conservation of Beijing Forestry University School of Water Conservancy and Environment Zhengzhou University School of Civil Engineering and Transportation North China University of Water Resources and Electric Power

Base the research of landform,soil erosion and vegetation characteristics,the comprehensive control model of soil and water conservation is summarized in Pisha stone *** dates shows that:The general idea of this area is to take the construction of gully dam system as the starting point and to strengthen the construction of gully dam system with the main project of gully *** line with local conditions,we will actively promote the construction of forest and grass vegetation,return farmland to forest and grassland,and implement large areas of closure and control,so as to give full play to the self-repair function of the ecosystem.

关键词： IOP Comprehensive control model of soil and water conservation in Pisha stone area

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：