检索结果-内蒙古大学图书馆

Effect of water discharge variation on water levels and flow characteristics in pipeline networks

IOP Conference Series: Earth and Environmental Science 2020年第1期419卷

作者： R Bachrun M S Pallu M A Thaha B Bakri Postgraduate Program (Doctorate) student Department of Civil Engineering Universitas Hasanuddin Indonesia Department of Enviromental Engineering Universitas Muhammadiyah Kendari Indonesia Department of Civil Engineering Faculty of Engineering Universitas Hasanuddin Jl. Poros Malino KM.6 Bontomarannu South Sulawesi Indonesia

The ability of flow discharge is very necessary in pipeline. When changes in discharge flow in the pipe, the flow pattern and water level will be different. The design of test equipment used is a pipe network made of acrylic pipes with inner diameter (d1) 64 mm and (d2) 44 mm. The fluid used is standard water with a viscosity value of 1.14 cp, fat oil 0 mg/L, and specific gravity 1.0304 gr/cm3. Data collection on the testing pipeline is divided into 10 segments or 10 observation points (OP) per discharge. Variations of debits flowed are 0.5 liters/sec, 1.2 liters/sec, 3.5 liters/sec. The relationship between discharge and depth of flow or water level from the bottom of pipe and the relationship between discharge and flow velocity is directly proportional or linear. The greater of discharge value flowed resulted in a shift in the flow characteristics where the low discharge value, the laminar flow patterns and transitions and high discharge values of flow pattern becomes turbulent.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Application of aspen plus for municipal solid waste plasma gasification simulation: case study of Jatibarang Landfill in Semarang Indonesia

引用

Journal of Physics: Conference Series 2018年第1期1025卷

作者： Ainie Khuriati Purwanto Purwanto Haryono Setiyo Huboyo Suryono Suryono Ari Bawono Putro Doctorate Program of Environmental Science UniversitasDiponegoro Semarang 50241 Indonesia Department of Physics Faculty of Science and Mathematics UniversitasDiponegoro Semarang 50275 Indonesia Department of Chemical Engineering Faculty of Engineering UniversitasDiponegoro Semarang50275 Indonesia Department of Environmental Engineering Faculty of Engineering UniversitasDiponegoro Semarang50275 Indonesia

The objective of this study is to apply the plasma gasification technology for MSW treatment. The gasification model used Gibbs free energy minimization approach using the Lagrange multiplier method. This model was simulated using the Aspen Plus software. The feedstock of plasma gasification was the MSW in Jatibarang landfill. To verify the model, RDF of Minutillo et al., 2009 was tested. Simulation and modeling of plasma gasification was carried out by air, 60% air mixture and steam 40%, air mixture 40% and steam 60%, as plasma gas, respectively. For 1 kg MSW per second yields hydrogen in mole fraction of 32.64%, 36.74%, 38.51%, while for CO was 31.25%, 26.75%, and 23.35%. The efficiency was 45%, 34% and 38% respectively. Efficiency and the highest of carbon monoxide produced were achieved when only air was used as the plasma gas. The addition of steam as the plasma gas increases hydrogen production but reduces carbon monoxide production. The greater the amount of vapor, the more hydrogen is produced.

关键词：

来源：评论

学校读者我要写书评

暂无评论

NEW TECHNOLOGY IN OIL CONTENT MONITORS

引用

NAVAL ENGINEERS JOURNAL 1989年第2期101卷 48-55页

作者： NARDELLA, JA RAW, TT STOKES, GH John A. Nardella is the life-cycle manager for oil content monitor equipment for the Naval Sea Systems Command Washington D.C. He has an M.S. degree in chemical engineering from the Pennsylvania State University and is a licensed professional engineer in the Commonwealth of Virginia. Dr. Timothy T. Raw is the principal investigator responsible for the oil contamination monitor project. He has a doctorate in physical chemistry from Rensselear Polytechnical Institute and a B.A. in chemistry and computer science from Saint Louis University. Dr. Raw is currently a staff member at Anheuser Busch Inc. in Saint Louis. Dr. Grant H. Stokes is responsible for the technical management of Geo-Centers Inc. Boston operation. He has doctorate and M. S. degrees in physics from Princeton University and a B.A. from Colorado College. Previous to joining Geo-Centers Inc. he was a staff member in the Laser Fusion Program at Los Alamos National Laboratory.

International antipollution requirements have been legislated to regulate the oil content of bilge effluent from ships. In response to these standards, the U.S. Navy is currently in the process of installing pollution abatement equipment on all vessels. The equipment will consist of an oil-water separator in the bilge discharge line, followed by an oil content monitor which makes the final decision on whether or not the water is clean enough to be pumped overboard. The monitor is required to make a real-time measurement of oil concentration in the range 15 ± 5 to 100 ± 20 ppm for flow rates up to 50 gal/min. and possibly in the presence of interfering contaminants, such as rust. This paper presents the results of the current effort to develop a monitor which satisfies all of these requirements and is sufficiently rugged for fleet deployment. The monitor under development employs two fiber optic systems and a small microprocessor. The first optical system measures the concentration of particles in the flow as a function of their sizes, using small angle forward scattering. The second determines what percentage of the particles in the flow are oil, using large angle scattering. The microprocessor takes the data from the two optical systems and calculates the oil concentration in the flow. Since the particle size is measured by the monitor, no sample preparation is required and the monitor may be placed directly in the discharge line where it responds to changes in oil content in less than one second. In addition, this monitor can notify the operator of impending oil-water separator failure associated with passing large oil particles. A demonstration monitor consisting of the forward scattering unit has been successfully tested at the NavSea oil pollution abatement test facility at the Naval Ship Systems engineering Station at Philadelphia. The monitor agrees well with chemical means of measuring oil content. Results of this comparison and laboratory test of a prototyp

关键词： Water Pollution

来源：评论

学校读者我要写书评

暂无评论

Heating value prediction for combustible fraction of municipal solid waste in Semarang using backpropagation neural network

引用

AIP Conference Proceedings 2015年第1期1699卷

作者： Ainie Khuriati Wahyu Setiabudi Muhammad Nur Istadi Istadi 1Doctorate Program of Environmental Science Diponegoro University Semarang 50241 Indonesia 2Department of Physics Diponegoro University Semarang 50275 Indonesia 3Department of Chemical Engineering Diponegoro University 50275 Semarang Indonesia

Backpropgation neural network was trained to predict of combustible fraction heating value of MSW from the physical composition. Waste-to-Energy (WtE) is a viable option for municipal solid waste (MSW) management. The influence of the heating value of municipal solid waste (MSW) is very important on the implementation of WtE systems. As MSW is heterogeneous material, direct heating value measurements are often not feasible. In this study an empirical model was developed to describe the heating value of the combustible fraction of municipal solid waste as a function of its physical composition of MSW using backpropagation neural network. Sampling process was carried out at Jatibarang landfill. The weight of each sorting sample taken from each discharged MSW vehicle load is 100 kg. The MSW physical components were grouped into paper wastes, absorbent hygiene product waste, styrofoam waste, HD plastic waste, plastic waste, rubber waste, textile waste, wood waste, yard wastes, kitchen waste, coco waste, and miscellaneous combustible waste. Network was trained by 24 datasets with 1200, 769, and 210 epochs. The results of this analysis showed that the correlation from the physical composition is better than multiple regression method .

关键词：

来源：评论

学校读者我要写书评

暂无评论

First Demonstration of Defect Elimination for Cryogenic Ge FinFET CMOS Inverter Showing Steep Subthreshold Slope by Using Ge-on-Insulator Structure

First Demonstration of Defect Elimination for Cryogenic Ge F...

引用

International Electron Devices Meeting (IEDM)

作者： X.-R. Yu C.-C. Hsieh M.-H. Chuang M.-Y. Chiu T.-C. Sun W.-Z. Geng W.-H. Chang Y.-J. Shih W.-H. Lu W.-C. Chang Y.-C. Lin Y.-C. Pai C.-Y. Lai Y. Dei C.-Y. Yang H.-Y. Lu N.-C. Lin C.-T. Wu K.-H. Kao W. C.-Y. Ma D. D. Lu Y.-J. Lee G.-L. Luo M.-H. Chiang T. Maeda W.-F. Wu Y.-M. Li T.-H. Hou Dept of Electrical Engineering National Cheng Kung University Tainan Taiwan Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan Taiwan Dept. of Electrical Engineering National. Sun Yat-Sen University Kaohsiung Taiwan National Institute of Advanced Industrial Science and Technology Ibaraki Japan Inst. of Artificial Intelligence Innovation National Yang Ming Chiao Tung University Hsinchu Taiwan Inst. of Biomedical Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Intelligent Computing Industrial Doctorate Program Miin Wu School of Computing National Cheng Kung University Taiwan Semiconductor Research Institute Inst. of Pioneer Semiconductor Innovation National Yang Ming Chiao Tung University Hsinchu Taiwan Inst. of Communications Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan

This work presents experimental electrical characteristics and circuit prediction at cryogenic temperatures (down to 10 K) for three different kinds of germanium (Ge)-based FETs with advanced Fin/GAA structures. Among them, the layer transferred Ge-on-Insulator (GeOI) FinFET significantly improves its I-V characteristic during cryogenic measurements, such as a steeper subthreshold swing at 10K and a better I on . The developed GeOI fabrication method provides an effective way to eliminate the defects originating from misfit dislocations at the Ge/Si substrate during epitaxial growth, which would be treated as the key to device performance enhancement under 10 K. According to the measured IV at 10 K and circuit prediction, GeOI FinFETs with high Ge crystallinity are strong candidates for High-Performance-Computing (HPC) applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Precise Hypocenter Determination around Palu Koro Fault: a Preliminary Results

引用

IOP Conference Series: Earth and Environmental Science 2017年第1期62卷

作者： M. Muhammad Fawzy Ismullah Andri Dian Nugraha Mohamad Ramdhan Wandono Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia Doctorate Program of Earth Science Faculty of Earth Sciences and Technology Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia Agency for Meteorology Climatology and Geophysics (BMKG) Jakarta Indonesia

Sulawesi area is located in complex tectonic pattern. High seismicity activity in the middle of Sulawesi is related to Palu Koro fault (PKF). In this study, we determined precise hypocenter around PKF by applying double-difference method. We attempt to investigate of the seismicity rate, geometry of the fault and distribution of focus depth around PKF. We first re-pick P-and S-wave arrival time of the PKF events to determine the initial hypocenter location using Hypoellipse method through updated 1-D seismic velocity. Later on, we relocated the earthquake event using double-difference method. Our preliminary results show the distribution of relocated events are located around PKF and have smaller residual time than the initial location. We will enhance the hypocenter location through updating of arrival time by applying waveform cross correlation method as input for double-difference relocation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Numerical calculation based on mass and energy balance of waste incineration in the fixed bed reactor

引用

Journal of Physics: Conference Series 2020年第1期1524卷

作者： A Khuriati P Purwanto H S Huboyo S Sumariyah S Suryono A B Putranto Doctorate Program of Environmental Science School of PascaSarjana. Diponegoro University Semarang 50241 Indonesia Department of Physics Faculty of Science and Mathematics Diponegoro University Semarang 50275 Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang 50275 Indonesia Department of Environmental Engineering Faculty of Engineering Diponegoro University Semarang 50275 Indonesia Department of Instrumentation dan Electronics School of Vocational Diponegoro University Semarang 50275 Indonesia

To evaluate the waste process incineration, a mass, and energy balance is employed to investigate the waste incineration process in a fixed bed. Thermodynamics equilibrium is implemented to describe the incineration process. The complete combustion is only products CO2, H2O, SO2, ash, and excess O2 considered. The mass balance calculates the total mass flow in and out incinerator. Energy balance includes input heat, evaporating heat, chemical heat, radiation, and convection. The input heat is calculated by considering the heat capacity, temperature, heating value, and total mass flow. Evaporation heat is calculated based on the water content, mass flow of each aqueous, and evaporation hot water flow. The result shows that efficiency energy of waste incinerator up to 79,33%. It means the incinerator is included in the good category.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Spatial analysis of field vulnerability concerning landslide in Southern Semarang Environment

引用

IOP Conference Series: Earth and Environmental Science 2019年第1期243卷

作者： H Tjahjono Suripin Kismartini Student of Doctorate Program on Environmental Science School of Postgraduates Studies Universitas Diponegoro Semarang 50275 Indonesia Promotor Civil Enginering Department Faculty of Engineering Universitas Diponegoro Semarang 50275 Indonesia Co-Promotor Administration Public Department Faculty of Social and Politic Universitas Diponegoro Semarang 50275 Indonesia

The study was done at Semarang, Central Java. The purpose of this study is to determine the variation of field susceptibility to landslide in the city of southern Semarang. Vulnerability includes physical, social, economic, and environmental ones. Each region has varying levels, types and characteristics of vulnerability. The results show that the vulnerability level of landslide is divided into 4 parts according to vulnerability indicator in Perka BNPB number 2 of 2012. The index categories were also modified into five categories from very low (1,00 to 1,40), low (1,41 to 1,80), moderate (1,81-2,20), high (2,21-2,40) and very high (2,41-3,0). Southern Semarang has moderate and high degree of vulnerability. The average vulnerability rate is in the high category with an index value of 2,20. The lowest average vulnerability is owned by Gunung Pati sub-District, while the highest vulnerability is owned by Candisari sub-District.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The effect of chills thickness to microstructure and surface hardness layer on specimen ductile cast iron

引用

AIP Conference Proceedings 2021年第1期2384卷

作者： Natalino Fonseca. D. S Guterres Rusnaldy Achmad Widodo Toto Carwita 1Department of Mechanical Engineering Dili Institute of Technology Ai Meti Laran Street Dili Timor Leste 2Doctorate Program Mechanical Engineering Department Diponegoro University Prof. Soedharto Street Tembalang Semarang 50275 Indonesia 3Department of Mechanical Engineering Faculty of Engineering Diponegoro University Prof. Soedharto Street Tembalang Semarang 50275 Indonesia 4Politeknik Manufacture Ceper-Jawa Tengah Indonesia

One of the methods used to surface hardening of ductile iron is chilled cast iron. Chill as the fast cooling rate in the mold during solidification and chill thickness greatly affects the thickness of the hardness layer. The main material used is ductile iron, and the chill material is SS 304. Casting uses the sand casting method. Before pouring, the chill plate has been inserted onto the surface of the pattern that has been formed in the mold, then the chill plate is preheated at 700°C. Pouring was carried out at a melting temperature of 1400°C, and then cooled with argon and O2 sprays into the mold in solidification conditions at exactly 700°C. The results analyzed were the microstructure, hardness value, and the hardness of the thickness layer. This chill coolant will absorb heat very quickly and the Cr and Ni alloy will diffuse to the specimen surface to stabilize the ferrite and austenite phases in the final solidification. The particles on the hard surface are has ferro carbide M7C3, which is in the form of cementite and martensitic phases so that to categorized as white cast iron structure formed on the surface with the area around 1.5-3mm has a hardness of 61-65HRC. But in the center area is 31-49HRC.

关键词：

来源：评论

学校读者我要写书评

暂无评论

READINESS AND TIMING

引用

NAVAL ENGINEERS JOURNAL 1985年第2期97卷 63-64页

作者： DUFF, KM Capt. Karl M. Duff USN is the deputy director for research and development in the Ship Systems Directorate of the Naval Sea Systems Command. He earned a doctorate in mechanical engineering from Massachusetts Institute of Technology. His prior service includes a tour of duty aboard the USS Brown (DD-546). He was project officer for construction of two hydrofoil ships PCH and AGEH. He also served as officer-in-charge of the Hydrofoil Special Trials Unit before his appointment as deputy project manager for the NATO PHM Acquisition Program. Captain Duff then served on the staff of the Chief of Naval Material with responsibility for acquisition programs. He later served as head of the Ocean Warfare Division of the Tactical Technology Office DARPA and as assistant chief of Naval research and development.

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：