检索结果-内蒙古大学图书馆

Journal of Structural and Construction engineering 2011年第659期76卷 141-148页

作者： Ishimura, Mitsuyoshi Sadasue, Kazushi Fujii, Toshiki Yokoyama, Tsuyoshi Minami, Koichi Ishimura Architects and Eng. Course of Regional Space Planning and Systems Engineerings Fukuyama Univ. Japan Dept. of Architectural Eng. Faculty of Eng. Hiroshima Institute of Technology Japan Architecture Master's Program Fukuyama Univ. Japan Constec Engineering Co. Ltd. Japan Dept. of Architecture and Civil Engineering Faculty of Eng. Fukuyama Univ. Japan

Seismic retrofitting with steel brace is widely-spread for the seismic retrofitting of existing RC buildings. However, there has been no study that tried to apply this seismic retrofit method to existing RC buildings with very low-strength concrete. In this research, we confirmed the effect of seismic retrofitting steel brace which used post-installed anchor together with epoxy resin for RC structures with low-strength concrete through the structural tests of two series. As the beginning, we confirmed the shear strength of the indirect connection in which existing RC frame is tied to frame of steel brace. Next, we confirmed the mechanical behavior of RC frame retrofitted with steel brace subjected to axial and horizontal loads. From the structural tests, it was shown that ultimate strength of the indirect connection and RC frame retrofitted with steel brace can be estimated by the current evaluation method. In addition, it made clear that ductility index F of RC frame retrofitted with steel brace can be 2.0.

关键词： Epoxy resins

来源：评论

学校读者我要写书评

暂无评论

A saturation excess erosion model

A saturation excess erosion model

引用

International Symposium on Erosion and Landscape Evolution 2011

作者： Tilahun, S.A. Mukundan, R. Demisse, B.A. Guzman, C. Tarakegn, B.C. Engda, T.A. Easton, Z.M. Collick, A.S. Zegeye, A.D. Schneiderman, E.M. Parlange, J.-Y. Steenhuis, T.S. Dept. of Biological Engineering Cornell University Ithaca NY United States School of Civil and Water Resources Engineering Bahir Dar University Bahir Dar Ethiopia CUNY Institute for Sustainable Cities Hunter College City University of New York New York NY United States New York City Dept. of Environmental Protection Kingston NY United States Cornell Master's Program in Integrated Watershed Management and Water Supply Bahir Dar Ethiopia Dept. of Renewable Resources University of Wyoming Laramie WY United States Dept. of Biological Systems Engineering Virginia Tech Blacksburg VA United States Amhara Regional State Agricultural Research Institute Addet Ethiopia

ISBN: (纸本)9781618397966

Scaling up sediment transport has been problematic because most sediment loss models (e.g., the Universal Soil Loss Equation) are developed using data from small plots where runoff is generated by infiltration excess. However, in most watersheds, runoff is produced by saturation excess processes. Therefore, scaling up requires a hydrology model that accurately predicts the location and extent of runoff source areas. These runoff predictions can then be used for simulating sediment concentrations. We base sediment predictions on a simple, well-tested distributed saturation excess hydrology model, which calculates surface runoff, interflow, and baseflow. Surface runoff originates from bottom lands that become saturated during the rainy season or from severely degraded lands with little or no storage capacity. Baseflow and interflow are generated from the remaining parts of the landscape. Interflow comes from the shallow soils over an impermeable surface and base flow results from percolation below the impervious layer. To obtain the sediment concentrations, we assume that during surface runoff, there is a linear relationship between runoff velocity and sediment concentration, but baseflow and interflow are sediment free. Thus only the runoff component of stream discharge is involved in active erosive work compared to baseflow and interflow that contribute minimally to watershed sediment yield. To show the general applicability of the Saturation Excess Erosion Model (SEEModel), the model was tested for watersheds located 10,000 km apart, in the United States and in Ethiopia. In the Ethiopia highlands, we simulated the 113 ha Anjeni watershed, the 400 ha Enkulal watershed and the 180,000 km2 the Blue Nile basin. In the Catskill Mountains in New York State, the sediment concentrations were simulated in the upper 493 km2 Esopus Creek watershed. Daily discharge and sediment concentration were well simulated over the range of scales with comparable parameter sets. The Nash

关键词： Watersheds

来源：评论

学校读者我要写书评

暂无评论

COMBAT systems-engineering AND THE TOP LEVEL REQUIREMENT

引用

NAVAL ENGINEERS JOURNAL 1981年第2期93卷 97-100页

作者： TRUXALL, CW is a Senior Program Engineer with Systems Consultants Inc. Washington D.C. serving as Project Manager for the DD 963 Combat System Engineering Program. Prior to his retirement from the U.S. Navy in 1978 he served in the AEGIS Project Office Naval Sea Systems Command as ASW Systems Manager and Combat Systems/Ship Design Coordinator. His previous assignments involved service in ten ships including engineering duty in Carriers and Submarines and two Destroyer commands. He is a 1957 graduate of the U.S. Naval Academy holds Master's degrees in Business Administration and Systems Management and attended the Program Managers Course at the Defense System Management College Fort Belvoir Va. He is a member of the American Defense Preparedness Association and has been a member of ASNE since 1958 having previously served on the ASNE Audit Committee and presently as the Chairman of the ASNE Membership Committee.

The Top Level Requirement (TLR) is a document that is required by the Chief of Naval Operations to be developed for new ship designs. This document describes in some detail the requirements levied on the ship designers for characteristics of the ship and its combat system. The Combat System engineering program has been developed in the Naval Sea systems Command (NAVSEA) to provide a disciplined approach to the engineering of upgrades and modernizations to current surface ship complex combat systems. One of the axioms of this systemized approach is that “top down” engineering must take place. That is, the rationale for the upgrade for the new elements being included in the system, and for the way the integration of those elements takes place, must be based upon a set of operational requirements. In order to systems engineer the developments of modernizations properly, the Author proposes that TLRs be developed for each combatant ship class without a TLR that is a candidate for a major modernization or upgrade. The primary focus would be on the combat system requirements, but also there is concern for the other ship operational characteristics as well. The TLR should be contained in a document of about twenty-five pages. As with the current TLRs, a Working Group of representatives from the Office of the Chief of Naval Operations (OPNAV), Naval Material Command (NAVMAT)/Naval Sea systems Command (NAVSEA), and other activities would be the developers of the new TLR. Because of the numbers of individuals with some responsibility in current Fleet ships, closer coordination between NAVMAT/NAVSEA and OPNAV is required. The process which this paper describes may well support significant cost savings in future-year combat system upgrades, and the Combat System engineering Community will have a basis for combat system design.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of calcium and magnesium catalyst on pyrolysis kinetic of Indonesian sugarcane bagasse for biofuel production

引用

Energy Procedia 2019年 158卷 431-439页

作者： Yano Surya Pradana Daniyanto Muhamad Hartono Laras Prasakti Arief Budiman Chemical Engineering Department Faculty of Engineering Universitas Gadjah Mada Jalan Grafika No. 2 Yogyakarta 55281 Indonesia Polytechnic of LPP – Plantation Training Institute Jalan LPP 1A Yogyakarta 55222 Indonesia Chemical Engineering Department Applied Sciences Faculty Delft University of Technology Mekelweeg 2 2628 CD Delft Netherlands Master Program of Systems Engineering Faculty of Engineering Universitas Gadjah Mada Jalan Teknika Utara No. 3 Yogyakarta 55281 Indonesia Center for Energy Studies Universitas Gadjah Mada Sekip K1-A Yogyakarta 55281 Indonesia

The present study aims to investigate the effect of CaO and MgO as catalyst in pyrolysis of Indonesian sugarcane bagasse (SCB) for biofuel production. Prior to being used as raw material, SCB underwent acid washing to remove its inherent Ca and Mg content. Catalytic and non-catalytic pyrolysis experiment were performed in a fixed-bed reactor within a temperature range of 20-480 o C. Thermogravimetric Analysis was used to describe the mechanism of pyrolysis and one-step global model was employed to determine the reaction kinetics. Pyrolysis stage comprised of a rapid decomposition zone (260-340 o C) and slow decomposition zone (340-480 o C). TG curve confirmed that the endothermic cellulose decomposition and volatilization was more dominant than exothermic polymerization and aromatization of lignin. Moreover, CaO provided the highest reaction kinetics with the lowest reaction order compared with catalytic pyrolysis with MgO and non-catalytic process, both in rapid and slow zone. Differential Thermal Analysis (DTA) and Differential Thermal Gravimetric (DTG) corresponded to this by showing that the energy for decomposition in non-catalytic process and using MgO and without catalyst was higher than SCB0-Ca which gave the highest conversion rate. Hence, this study shows that the addition of CaO as catalyst can improve the kinetics of SCB pyrolysis.

关键词： pyrolysis Indonesian sugarcane bagasse catalyst thermogravimetric reaction kinetic

来源：评论

学校读者我要写书评

暂无评论

Operationally oriented vulnerability requirements in the ship design process

引用

NAVAL ENGINEERS JOURNAL 1998年第1期110卷 19-34页

作者： Reese, RM Calvano, CN Hopkins, TM Dr. Ronald M. Reese has headed the Live Fire Test and Evaluation Sea Systems Team in the Operational Evaluation Division (OED) of the Institute for Defense Analyses (IDA) for the past 7 years. From 1980 to 1990 he worked at NKF Engineering Inc. in various areas of ship survivability and ship design specializing in ship signature reduction. From 1960 to 1980 he served in the U.S. Navy as a surface line officer and in various capacities as an Engineering Duty Officel including Naval Ship Engineering Center Ship Design Manager for PHM and Continuing CV Conceptual Design NAVSEA PMS 378 Program Manager/SUPSHIP Newport News Project Officerf or VIRGINIA (CCN 38) Class construction and Force Maintenance Officel Commander Naval Surface Force U S. Atlantic Fleet. He retired from the Nay in 1980 with the rank of Commander Dr Reese graduated from the U. S. Naval Academy and holds the degrees of Master of Science (Mechanical Engineering) Naval Engineel: and Doctor of Philosophy from M.I. 7: He is a member ofASNE SNAME and Tau Beta Pi.

For the first time in a top-level requirements document-the Land Attack Destroyer (DD 21) Operational Requirements Document (ORD)-the U.S. Navy has implemented performance requirements that relate ship vulnerability to threat weapon types and the level of mission capability remaining after a ship is hit. The Navy's Ship Operational Characteristics Study recommended an operational survivability standard of this type in 1988. It is needed to define clearly to the designer the levels of operational capability that must remain after a ship is hit, and to let decision makers know what to expect from ships they are buying. It also is needed to provide a benchmark against which the results of Live Fire Test and Evaluation (LFT&E) can be compared. This paper discusses various approaches for formulating operationally oriented vulnerability requirements (OOVRs), a way to balance OOVRs with susceptibility requirements, and how OOVRs can be implemented at the ship design level. The paper also discusses possible concerns associated with implementing OOVRs, and how they can be resolved. It recommends that OOVRs be implemented for each new U.S. Navy combatant ship acquisition program, including submarines.

关键词： Warships

来源：评论

学校读者我要写书评

暂无评论

The Role of Interconnected Island Networks for Decarbonising Power Sector in Large Archipelago Nation

SSRN

引用

SSRN 2023年

作者： Reyseliani, Nadhilah Pratama, Yoga Wienda Shafira, Alya Nurul Dowell, Niall Mac Kammen, Daniel M. Purwanto, Widodo Wahyu Sustainable Energy Systems and Policy Research Cluster Universitas Indonesia Depok16424 Indonesia Chemical Engineering Department Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Master Program in Energy Systems Engineering Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Centre for Environmental Policy Imperial College London South Kensington LondonSW7 1NA United Kingdom Schlossplatz 1 Laxenburg2361 Austria Renewable and Appropriate Energy Laboratory and Energy and Resources Group University of California BerkeleyCA94720 United States

The reality in modelling the power system transition of an archipelagic country lies in the substantial investment required for interisland transmission lines and the uneven distribution of electricity demand. Approximately 72–75% of Indonesia's electricity demand is centered on Java, where the substantial population density constrains the land availability for renewable energy. Therefore, the spatial aspect in modelling Indonesian power system becomes important. This study assessed the differences in the decarbonisation of the Indonesian power system using single- and multi-region optimisation models and compared the isolated and interconnected power systems using the Integrated MARKAL–EFOM System (TIMES) Indonesia. The findings indicated that the isolated multi-region approach exhibited lower penetration of renewable energy compared to the single-region approach. Introducing interconnected power system enhanced the renewable energy mix by 2.5 times, reduced the overall system cost, CO2 storage capacity, and coal consumption by building 115 GW of interisland grid and importing 62% of electricity in Java from Sumatra, Kalimantan, and NT, which resulting in more distributed investment. However, due to the considerable distance, an interconnected power system is not considered a cost-effective solution for Papua, Sulawesi, and Maluku. Decarbonisation under coal phase-out plan helps reduce the interisland transmission system by 8.3%. © 2023, The Authors. All rights reserved.

关键词： Cost effectiveness

来源：评论

学校读者我要写书评

暂无评论

Vibration-based classification of road damages: gyroscope data and a simple neural network model

引用

IOP Conference Series: Earth and Environmental Science 2018年第1期195卷

作者： Fergyanto E. Gunawan Herriyandi Benfano Soewito Tuga Mauritsius Nico Surantha Industrial Engineering Department BINUS Graduate Program - Master of Industrial Engineering Bina Nusantara University Jakarta Indonesia 11480 Computer Science Department BINUS Graduate Program - Master of Computer Science Bina Nusantara University Jakarta Indonesia 11480 Information Systems Management Department BINUS Graduate Program - Master of Information Systems Management Bina Nusantara University Jakarta Indonesia 11480

A system for automatic detection of road damages is essential for logistics management. At the core of the system lies an algorithm for classification of damages. This work intends to establish such an algorithm. In the current proposal, the algorithm receives data of the probe vehicle rate of rotations, extracts statistics descriptive from the data to produce a feature vector, and finally, feeds the vector to a simple-three-layer neural network to classify the damages. The types of damages are limited to four cases: normal, pothole, speed bump, and expansion joint. For the development, a probe vehicle is used to produce 400 empirical data involving those four damage cases. By using Monte Carlo approach, the established neural network model is evaluated. The results show that the approach is able to classify the cases with 85% accuracy. The study also finds that the rates of pitch and roll to be the determining factors.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Naphtha’s price forecasting using Neuro-fuzzy system

Naphtha’s price forecasting using Neuro-fuzzy system

引用

SICE Annual Conference

作者： Porntip Visetsripong Pitikhate Sooraksa Pramote Luenam Watchareeporn Chaimongkol Joint Master of Science Program in Information Technology Management National Institute of Development Administration Bangkok Thailand Faculty of Engineering ing Mongkut's Institute of Technology Ladkrabang Bangkok Thailand Information Systems Education Center National Institute of Development Administration Bangkok Thailand School of Applied Statistics National Institute of Development Administration Bangkok Thailand

Naphthapsilas price forecasting using Neuro-fuzzy system is a forecasting technique that applied information technology with statistics. 1950 daily prices were collected as a time-series data with trend component. The research found that Neuro-Fuzzy system is more accurate and more reliable than a statistical method; it also works well with continuous data and performs better with more training data. Neuro-Fuzzy system might be used with different data type, but, it might come across with other factors, e.g. seasonal or irregular event. The research also illustrates the multidisciplinary nature in todaypsilas world of works in the era of merging among many disciplines.

关键词： Forecasting Predictive models Smoothing methods Neurons Market research Time series analysis Data models

来源：评论

学校读者我要写书评

暂无评论

STATISTICAL QUALITY-CONTROL AND NAVY SHIP REPAIR

引用

NAVAL ENGINEERS JOURNAL 1993年第1期105卷 59-65页

作者： STIMSON, WA The Author:received his B.S. degree in mathematics from the University of Texas at El Paso in 1964 and his M.S. degree in engineering from the University of Santa Clara in 1971. Mr. Stimson was employed in the aerospace industry for ten years then joined the Naval Ship Weapon Systems Engineering Station (NSWSES) in Port Hueneme Calif. in 1973. At NSWSES he served ten years as a project supervisor on Ship Qualification Trials and seven years as program manager of the Master Ordnance Repair program. Today Mr. Stimson lives in Charlotteville Va. and is a Ph.D. candidate in systems engineering at the University of Virginia majoring in quality management and statistical quality control.

Since the end of the Cold War, there have been demands in the United States to step down defense costs. One effect of these demands is a shift in accent within the U.S. Navy from acquisition to maintenance in order to make ships and ship systems last longer. Inevitably, this will mean more work for the ship repair industry, public and private. At the same time, the Navy is concerned about quality improvement in its industrial base and is encouraging the use of strategies generally known as Total Quality Management. However, the characteristics of Navy ship repair challenge many of the TQM methods that work so well in manufacturing. Government contracts restrict such quality strategies as single sourcing and just-in-time inventory. Government quality assurance requirements rely heavily upon final inspection. Navy business methods such as fragmentation of the work package among independent performers and constant and universal interface between customer and performer impede cohesive control. Finally, Navy ship repair, unlike the automaton factory, requires labor intensive, high skill, non-rote craftsmanship across many thousands of low volume activities. The quality objective is this: to measure, control, and improve the processes of ship repair in order to reduce variation from target values and to provide customer satisfaction. This can be done through statistical process control adapted to job shop operation. This paper describes how SQC methods can be applied to production, logistics, quality control, and test programs in order to control the critical path and quantify the quality character of the shipyard. Control is maintained through a closed loop management model which uses key state variables for process measurement. Quality is determined by characteristic curves and quantified by process control limits.

关键词：

来源：评论

学校读者我要写书评

暂无评论

RACER - A DESIGN FOR MAINTAINABILITY

引用

NAVAL ENGINEERS JOURNAL 1985年第5期97卷 139-146页

作者： DONOVAN, MR MATTSON, WS Michael R. Donovanis a 1974 graduate of the United States Naval Academy where he received his undergraduate degree in naval architecture. In 1975 he received a master of science degree in naval architecture and marine engineering from the Massachusetts Institute of Technology. After completing the Navy's nuclear power training program he served as machinery division officer in USSBainbridge (CGN-25) and chemistry and radiological controls assistant in USSLong Beach (CGN-9). He successfully completed the Navy's surface warfare officer qualification and passed the nuclear engineer's examination administered by Naval Reactors. He was then assigned to the Ship Design and Engineering Directorate (SEA-05) Naval Sea Systems Command as head systems engineer on the DDG-51 ship design project where he received the Navy Commendation Medal for outstanding performance. He is currently with Solar Turbines Incorporated as manager ship integration and integrated logistic support for the Rankine cycle energy recovery (RACER) system. Mr. Donovan has lectured at Virginia Polytechnic Institute teaching marine engineering and has given presentations on ship design at various symposiums and section meetings for both ASNE and SNAME. He has been a member of ASNE and SNAME since 1972 and is registered as a professional engineer in California and Virginia. Wayne S. Mattsonreceived his B.S. degree in mechanical engineering from Western New England College in 1972. Following graduation he attended Naval Officer Candidate School and was subsequently assigned as a project officer to COMOPTEVFOR where he was responsible for technical and operational test plans their execution and final equipment appraisal. Following a tour as engineering officer aboard the USSNespelen (AOG-55) he was assigned as commissioning MPA aboard the USSElliot (DD-967) the fifthSpruanceclass destroyer. For the past six years he has been employed by Solar Turbines Incorporated in program management within the advanced development department. He is currently

There is a great deal of emphasis currently in the Navy on the issues of reliability and maintainability. If a system or component is out of commission, it obviously cannot perform its mission. Thus, systems and components must be reliable, with low failure rates, and maintainable, with short repair times when the system does become inoperable. To be effective, these attributes must be incorporated into new ship systems early in the design stage. The Rankine cycle energy recovery (RACER) system is a heat recovery steam cycle designed to recover energy from the exhaust of an LM2500 gas turbine for augmentation of a ship's propulsion system. The RACER system provides several advantages to a gas turbine powered ship, one of which is improved fuel efficiency for significant annual fuel savings. This saving does not come free, however, since, in general, any additional system installed in the ship will have some maintenance requirements. In keeping with the Navy's current emphasis, a key philosophy in the design of the RACER system has been to minimize this maintenance burden. After a brief description of the RACER system and its design philosophy, the techniques being used during the design phase to minimize the maintenance burden on the fleet are presented. Trade-off studies concerning acquisition versus life-cycle costs, including fuel and maintenance costs, are discussed. Innovations incorporated into this state-of-the-art system are reviewed with an emphasis on design for affordability.

关键词： COGENERATION PLANTS

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：