检索结果-内蒙古大学图书馆

6th International Conference on Advanced Materials for Better Future, ICAMBF 2021

作者： Rohman, R.K. Kristiawan, S.A. Saifullah, H.A. Basuki, A. Doctoral Degree Program in Civil Engineering Sebelas Maret University Surakarta Indonesia Civil Engineering Department Sebelas Maret University Surakarta Indonesia

This paper describes the bond strength comparison between concrete and reinforcement with several types of concrete. The types of concrete studied were normal concrete (NC), Self-Compacting Concrete (SCC), High-Volume Fly Ash Concrete (HVFAC), and High-Volume Fly Ash Self-Compacting Concrete (HVFA-SCC). Research data were obtained from previous studies. The data of concrete bond strength were obtained by testing the reinforced concrete beam with a lap splice in the tensile moment area. Bond strength values were normalized by dividing with the square root of concrete grade. Then use normalized data to formulate the relationship between the length of lap splice to diameter ratio (ls/db) and the normalized bond strength concrete for both normal concrete and SCC. From the obtained relationship, we can compare the bond strength between NC and SCC. The SCC bond strength is higher than NC. Bond strength of HFVAC and HVFA-SCC is also higher than NC and SCC, so that the use of HVFA-SCC can reduce the need for lap splice. © 2022 Published under licence by IOP Publishing Ltd.

关键词： Self compacting concrete

来源：评论

学校读者我要写书评

暂无评论

HYDROCARBON VAPOR DIFFUSION IN INTACT CORE SLEEVES

引用

GROUND WATER MONITORING AND REMEDIATION 1993年第1期13卷 139-150页

作者： OSTENDORF, DW MOYER, EE XIE, YF RAJAN, RV 1 David W. Ostendorf (Civil Engineering Department University of Massachusetts Amherst MA 01003) is an associate professor in the Environmental Engineering Program of the Civil Engineering Department of the University of Massachusetts at Amherst. His research interests include unconfined aquifer contamination hazardous waste site remediation and analytical modeling of problems in environmental fluid mechanics. Ostendorf is a Registered Professional Engineer in Massachusetts and a member of the American Geophysical Union American Society of Civil Engineers Soil Science Society of America Water Pollution Control Federation and Association of Environmental Engineering Professors as well as the National Ground Water Association.2 Ellen E. Moyer (Civil Engineering Department University of Massachusetts Amherst MA 01003) is a doctoral candidate in the Environmental Engineering Program of the Civil Engineering Department of the University of Massachusetts at Amherst with an M.S. degree in environmental engineering from that institution. Her research interests include subsurface investigation soil venting bioremediation and analytical modeling of subsurface contamination. She has six years of professional experience managing hazardous waste site investigation and cleanup projects and is a member of the National Ground Water Association and the American Society of Civil Engineers.3 Yuefeng Xie (Civil Engineering Department University of Massachusetts Amherst MA 01003) is a postdoctoral research associate in the Environmental Engineering Program of the Civil Engineering Department of the University of Massachusetts at Amherst. His research interests include environmental analyses drinking water treatment and the chemical characterization and removal of disinfection by-products. A graduate with a Ph.D. and an M.S. in environmental engineering and a B.S. in chemistry and chemical engineeering from Tsinghua University Beijing China Xie is a member of the American Water Works Association and the Water

The diffusion of 2,2,4-trimethylpentane (TMP) and 2,2,5-trimethylhexane (TMH) vapors out of residually contaminated sandy soil from the U.S. Environmental Protection Agency (EPA) field research site at Traverse City, Michigan, was measured and modeled. The headspace of an intact core sleeve sample was swept with nitrogen gas to simulate the diffusive release of hydrocarbon vapors from residual aviation gasoline in and immediately above the capillary fringe to a soil-venting air flow in the unsaturated zone. The resulting steady-state profile was modeled using existing diffusivity and air porosity estimates in a balance of diffusive flux and a first order source term. The source strength, which was calibrated with the observed flux of 2,2,4-TMP leaving the sleeve, varied with the residual gasoline remaining in the core, but was independent of the headspace sweep flow rate. This finding suggested that lower soil-venting air flow rates were in principle as effective as higher air flow rates in venting LNAPL vapors from contaminated soils. The saturated vapor concentration ratio of 2,2,4-TMP to 2,2,5-TMH decreased from 6.6 to 3.5 over the duration of the experiments in an expression of distillation effects. The vertical profile model was tested against sample port data in four separate experiments for both species, yielding mean errors ranging from 0 to -24 percent in magnitude.

关键词：

来源：评论

学校读者我要写书评

暂无评论

USGS compiles data set for national assessment of VOCs in ground water

引用

GROUND WATER MONITORING AND REMEDIATION 1997年第4期17卷 147-157页

作者： Lapham, WW Neitzert, KM Moran, MJ Zogorski, JS Wayne W. Lapham is ground water specialist for the U.S. Geological Survey's National Water-Quality Assessment Program (MS 413 12201 Sunrise Valley Dr. Reston VA 20192 e-mail: wlapham.er.usgs.gov) and also coordinates the work described in this article for the VOC National Synthesis Project of the NAWQA Program. He has worked for the USGS since 1976. He has a Ph.D. degree in hydrology an M.S. degree in geology and a B.S. degree in mechanical engineering. Kathleen M. Neitzert is a computer assistant with the USGS assisting the VOC National Synthesis Project (U.S. Geological Survey 111 Kansas SW Huron SD 57350) with data base activities for the NAWQA Program. She has been with the USGS since 1983 and has a B.A. degree in secondary education from South Dakota State University. Michael J. Moran is a doctoral student in geological engineering (hydrogeology) at the South Dakota School of Mines and Technology (U.S. Geological Survey 1608 Mt. View Rd. Rapid City SD 57702). He is working part-time at the USGS in Rapid City South Dakota on the assessment described in this article for the NAWQA VOC National Synthesis. John S. Zogorski is chief VOC National Synthesis Project (U.S. Geological Survey 1608 Mt. View Rd. Rapid City SD 57702 e-mail: jszogors. cr.usgs.gov) which is being completed by the U.S. Geological Survey as part of the NAWQA Program. He has worked for the USGS since 1992 and previously held a variety of academic positions. His Ph.D. and M.S. degrees are from Rutgers University (environmental sciences) and B.S. degree is from Drexel University (civil engineering).

来源：评论

学校读者我要写书评

暂无评论

Reinforcement to concrete bond strength: a comparison between normal concrete and various types of concrete

引用

Journal of Physics: Conference Series 2022年第1期2190卷

作者： R K Rohman S A Kristiawan H A Saifullah A Basuki Doctoral Degree Program in Civil Engineering Sebelas Maret University Surakarta Indonesia Civil Engineering Department Sebelas Maret University Surakarta Indonesia

关键词：

来源：评论

学校读者我要写书评

暂无评论

Degradation of Formaldehyde Using a Mixture of Zn or Sn-Doped Tio2 and Zeolite Synthesized from Waste

SSRN

引用

SSRN 2023年

作者： Chang, Yu-Chi Chou, Feng-Chih Huang, Sz-Ping Chen, Ku-Fan Lin, Yuan-Chung Institute of Environmental Engineering National Sun Yat-Sen University Kaohsiung804 Taiwan Center for Emerging Contaminants Research National Sun Yat-Sen University Kaohsiung804 Taiwan Department of Civil Engineering National Chi Nan University Puli Nantou545 Taiwan Department of Public Health College of Health Science Kaohsiung Medical University Kaohsiung City807 Taiwan Doctoral Degree Program in Toxicology College of Pharmacy Kaohsiung Medical University Kaohsiung807 Taiwan

ormaldehyde (HCHO) is a significant volatile organic compound (VOC) commonly found in indoor air, leading to serious health implications upon exposure. This study investigates the photocatalytic degradation of formaldehyde using Zn or Sn-doped TiO2 as the photocatalyst. Microwave system is used not only for synthesizing aluminum slag and glass but for doping Sn and Zn into zeolite. The results showed that P25-TiO2 nanoparticles annealed at 400°C exhibited a higher intensity of anatase peaks, while TiO2 doped with 0.5 mol% Zn and Sn and annealed at 400°C showed stronger anatase peaks in the XRD patterns. SEM images displayed a surface morphology with fine flakes and flower-like structures after annealing at 400°C for Zn and Sn-doped TiO2, respectively. Photoluminescence analysis indicated that 0.5 mol% Zn-doped TiO2 exhibited a greater red shift and lower intensity. Among the various samples, TiO2 doped with 0.5 mol% Zn demonstrated the optimal photocatalytic efficiency for formaldehyde degradation, achieving the highest degradation efficiency of 75% within 40 minutes. 0.5 mol% Zn-doped TiO2 can effectively enhance the photocatalytic performance and degradation efficiency of formaldehyde due to reducing recombination centers. The hydroxycancrinite mixed TiO2 doped with 0.5 mol% Zn exhibited an increased specific surface area of 95.5 m2 g−1. Under visible light, formaldehyde degradation reached saturation within 20 minutes, resulting in an efficiency of 20.1%. Both photodegradation and adsorption was used for formaldehyde degradation. The study provides the development of efficient materials for indoor air treatment and pollutant degradation. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

来源：评论

学校读者我要写书评

暂无评论

Techno-economic analysis of a central receiver power plant with different levels of storage capacity and hybridization

引用

AIP Conference Proceedings 2018年第1期2033卷

作者： Daniel L. C. Costa José H. M. Neto 1Energy Engineering Master’s Degree Mechanical Engineer. Centro Federal de Educação Tecnológica de Minas Gerais Department of Mechanical Engineering – Master Program of Energy Engineering. Address: Av. Amazonas 7675 Belo Horizonte-MG Brazil 30510-000. Phone: +55-31-999986464 2Civil Engineering Doctoral Degree Mechanical Engineering Master’s Degree Mechanical Engineer. Centro Federal de Educação Tecnológica de Minas Gerais Department of Mechanical Engineering – Master Program of Energy Engineering. Address: Av. Amazonas 7675 Belo Horizonte-MG Brazil 30510-000

The energy storage and fossil-backup (fossil-hybridization) systems of a concentrating solar power plant (CSP) provide a continuous production of energy all over the year and satisfy the grid demand even when the sun is not shining. One could ask about the behavior of the energy production, or the levelized energy cost, as a function of the energy storage and of the fossil-hybridization in such plants. This paper tries to answer this question. For this task, there have been performed numerous simulations on a central receiver plant with a fixed nominal power, varying the storage capacity and the level of hybridization. The results showed that these variables impact differently. For the thermal storage, from capacities ranging from 0h to 24h, there is a specific intermediary capacity, 15h, in which the levelized energy cost is minimum. But for the fossil-hybridization, this energy cost always decreases with the increment of the hybrid level. The results also showed that, if a given energy production is supported by a certain level of hybridization, its energy cost would be less than that supported by a storage system. This is due to the relatively high investment costs related to the storage system, and the relatively low cost of fuel.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Comparison of the energy demand with the envelope limitations of the performance normative of Brazil and Spain

引用

AIP Conference Proceedings 2023年第1期2928卷

作者： Letiane Benincá Claudia Glitzenhirn Ana Carolina Passuello Eva Crespo Sánchez José María González Barroso Doctoral degree in Architectural Building Construction and Urbanism Architecture Technology Department Universitat Politècnica de Catalunya Av. Diagonal 649 08028 Barcelona Spain Postgraduate Program in Civil Engineering: Construction and Infrastructure Federal University of Rio Grande do Sul Av. Osvaldo Aranha 99 90035-190 Porto Alegre Rio Grande do Sul Brazil Architecture and Urbanism Federal University of Rio Grande do Sul Rua Sarmento Leite 320 99050-170 Porto Alegre Rio Grande do Sul Brazil

Buildings consume 42.6% of the electricity generated in Brazil, and the residential sector is responsible for 21,4% of that amount, in other words, almost a quarter of the generated electricity. Add to this fact, the housing deficit was almost 6 million in 2019 in the country. The purpose of this article is to analyze the results of the heating and cooling demand of a social residential building designed in an H shape, in Passo Fundo, in southern Brazil, from the perspective of the thermal transmittance limitation of the Brazilian normative (NBR 15575) and the Spanish Technical Code (CTE). The main objective is to verify and analyze the existing differences and potentials in the comparison between the regulations, evaluating the thermal envelope of a typical social housing building. The method used to obtain results was a computer simulation, using EnergyPlus software as an energy calculation engine and Sketchup 2017 for the modeling, with the Euclid plugin, which directly sends data to the energy simulation program. The building was simulated with climate data from the city of Passo Fundo, belonging to the Brazilian Bioclimatic Zone 2 (BZ2), and was compared to the transmittance level required for the D1 climate of Spain, as required by the CTE. Finally, it is possible to evidence that there is a decrease in the building’s energy demand as thermal insulation is incorporated into the walls and roof, to reach the strictest standard requirement levels. This article intends to show the potential for improvement in Brazilian regulations and the path to be followed concerning energy improvement in buildings.

关键词：

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：