检索结果-内蒙古大学图书馆

IEEE Conference on Decision and Control

作者： Ilyasse Aksikas Joseph J. Winkin Denis Dochain Department of Chemical & Materials Engineering University of Alberta Edmonton AB Canada Department of Mathematics University of Namur-FUNDP Namur Belgium Center of Systems Engineering and Applied Mechanics (CESAME) Université Catholique de Louvain Louvain-la-Neuve Belgium

ISBN: (纸本)1424401704;9781424401703

The linear-quadratic (LQ) optimal control problem is studied for a class of first-order hyperbolic partial differential equation models by using a nonlinear infinite-dimensional Hilbert state-space description. First the dynamical properties of the linearized model around some equilibrium profile are studied. Next the LQ-feedback operator is computed by using the corresponding operator Riccati algebraic equation whose solution can be obtained via a related matrix Riccati differential equation in the space variable. Then the latter is applied to the nonlinear model, and the resulting closed-loop system dynamical performances are analyzed

关键词： Control systems Optimal control Riccati equations Differential equations Stability Nonlinear control systems Partial differential equations Differential algebraic equations Nonlinear equations Performance analysis

来源：评论

学校读者我要写书评

暂无评论

Collective coordinate control of density distributions

引用

Physical Review E 2006年第3期74卷 031104-031104页

作者： Obioma U. Uche Salvatore Torquato Frank H. Stillinger Department of Chemical Engineering Princeton University Princeton New Jersey 08544 USA Department of Chemistry Princeton University Princeton New Jersey 08544 USA Princeton Institute for the Science and Technology of Materials Princeton University Princeton New Jersey 08544 USA Program in Applied & Computational Mathematics Princeton University Princeton New Jersey 08544 USA Princeton Center for Theoretical Physics Princeton University Princeton New Jersey 08544 USA

Real collective density variables C(k) [cf. Eq. (1.3)] in many-particle systems arise from nonlinear transformations of particle positions, and determine the structure factor S(k), where k denotes the wave vector. Our objective is to prescribe C(k) and then to find many-particle configurations that correspond to such a target C(k) using a numerical optimization technique. Numerical results reported here extend earlier one- and two-dimensional studies to include three dimensions. In addition, they demonstrate the capacity to control S(k) in the neighborhood of ∣k∣=0. The optimization method employed generates multiparticle configurations for which S(k)∝∣k∣α, ∣k∣⩽K, and α=1, 2, 4, 6, 8, and 10. The case α=1 is relevant for the Harrison-Zeldovich model of the early universe, for superfluid He4, and for jammed amorphous sphere packings. The analysis also provides specific examples of interaction potentials whose classical ground states are configurationally degenerate and disordered.

关键词： STATISTICAL MECHANICS REALIZABILITY SYSTEM

来源：评论

学校读者我要写书评

暂无评论

Plant-wide (BSM2) evaluation of reject water treatment with a SHARON-anommox process

Plant-wide (BSM2) evaluation of reject water treatment with ...

引用

作者： Volcke, Eveline I.P. Gernaey, K.V. Vrecko, Darko Jeppsson, Ulf Van Loosdrecht, M.C.M. Vanrolleghem, Peter A. BIOMATH Department of Applied Mathematics Biometrics and Process Control Ghent University Coupure Links 653 B-9000 Gent Belgium Department of Industrial Electrical Engineering and Automation Lund University PO Box 118 SE-22100 Lund Sweden Department of Chemical Engineering Technical University of Denmark Building 229 DK-2800 Kgs. Lyngby Denmark Department of Systems and Control Jožef Stefan Institute Jamova 39 SI-1000 Ljubljana Slovenia Department of Biochemical Engineering Delft University of Technology Julianalaan 67 NL-2628 BC Delft Netherlands ModelEAU Département de Génie Civil Université Laval Pavillon Pouliot Québec QC G1K 7P4 Canada

ISBN: (纸本)1843395835

In wastewater treatment plants (WWTPs) equipped with sludge digestion and dewatering systems, the reject water originating from these facilities contributes significantly to the nitrogen load of the activated sludge tanks, to which it is typically recycled. In this paper, the impact of reject water streams on the performance of a WWTP is assessed in a simulation study, using the Benchmark Simulation Model no. 2 (BSM2), that includes the processes describing sludge treatment and in this way allows for plant-wide evaluation. Comparison of performance of a WWTP without reject water with a WWTP where reject water is recycled to the primary clarifier, i.e. the BSM2 plant, shows that the ammonium load of the influent to the primary clarifier is 28% higher in the case of reject water recycling. This results in violation of the effluent total nitrogen limit. In order to relieve the main wastewater treatment plant, reject water treatment with a combined SHARON-Anammox process seems a promising option. The simulation results indicate that significant improvements of the effluent quality of the main wastewater treatment plant can be realized. An economic evaluation of the different scenarios is performed using an Operating Cost Index (OCI). © IWA Publishing 2006.

关键词： Wastewater treatment

来源：评论

学校读者我要写书评

暂无评论

Mechanism of enhanced broadening of the ionization level of Li outside transition metal surfaces

引用

Physical Review B 2006年第11期74卷 115109-115109页

作者： Keith Niedfeldt Peter Nordlander Emily A. Carter Department of Mechanical and Aerospace Engineering and Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544-5263 USA Department of Physics and Astronomy M.S. 61 Rice University P.O. Box 1892 6100 South Main Street Houston Texas 77251-1892 USA

We show that the d-band of a transition metal surface induces intra-atomic hybridization of an atom in its vicinity. It is demonstrated that such hybridization can have a profound influence on the resonance width and hence lifetime of the atomic ionization level. The degree of Li s−p hybridization is found to be directly correlated to the overlap of the d-band density of states with the Li 2s and 2p levels, and is shown to be not due solely to long-range electrostatic image potential effects.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Noninvasive Ultrasound Transdermal Insulin Delivery and Glucose Monitoring Using a Low‐Profile Cymbal Array

引用

AIP Conference Proceedings 2006年第1期829卷 553-557页

作者： E.‐J. Park J. Luis R. J. Meyer M. V. Pishko N. B. Smith *Department of Bioengineering The Pennsylvania State University University Park PA 16802 †Graduate Program in Acoustics The Pennsylvania State University University Park PA 16802 ‡Applied Research Laboratory The Pennsylvania State University University Park PA 16802 §Department of Chemical Engineering The Pennsylvania State University University Park PA 16802

Recent studies have shown that ultrasound mediated transdermal drug delivery offers promising results for noninvasive drug administration. The purpose of this study was to demonstrate ultrasonic transdermal insulin delivery and in vivo sensing glucose with a novel, low‐profile ultrasound array based on the cymbal transducer. As a practical device, the array composed of circular cymbal transducers was thin (< 7mm) and weighed less than 22g. Using this array on hyperglycemic rats, our previous experiments demonstrated that blood glucose would decrease by 296.7 mg/dL from 60 minutes of ultrasound exposure. With a similar intensity, our goal was to evaluate the feasibility of insulin delivery with large animals (rabbits and pigs) and noninvasively determine the glucose level of hyperglycemic rats with the array system. Ultrasound was exposed for 60 minutes at Isptp=100 mW/cm2. With the same procedure, a preliminary experiment of large animal was performed on a pig (12 kg) at Isptp=50 mW/cm2. For the control experiments in insulin delivery, the blood glucose level varied little from the initial baseline. However, for the ultrasound and insulin exposure experiment, the glucose level was found to decrease by 132.6 mg/dL in 60 minutes and continued to decrease by 208.1 mg/dL in 90 minutes. From the preliminary pig experiment, the blood glucose level decreased by 120 mg/dL in 90 minutes. To noninvasively determine the glucose level, ultrasound exposure experiments with an electrochemical glucose biosensor were performed on hyperglycemic rats. After 20 minutes ultrasound exposure, the biosensor was placed at the exposure area to determine the concentration of glucose diffused through the skin. The glucose level of rats determined by the biosensor was 408 mg/dL which was very similar to the results of conventional glucose meter reading 396.7 mg/dL. Recently, a rectangular cymbal transducer was developed to obtain a larger sonication area without an increase in array size. Prel

关键词：

来源：评论

学校读者我要写书评

暂无评论

Enabling a strong U.S. engineering workforce for leadership of technology development and innovation in industry: The economic multiplier of skill-set development for engineering innovation and leadership

Enabling a strong U.S. engineering workforce for leadership ...

引用

113th Annual ASEE Conference and Exposition, 2006

作者： Tidwell, Joseph McHenry, Albert Keating, Donald Stanford, Thomas Bardo, John Dunlap, Duane Burbank, Kenneth Zhang, James Quick, David Truesdale, Samuel Boeing Co. United States JACMET College of Technology and Applied Sciences Arizona State University Polytechnic United States College Industry Partnership Division Corporate Members Council American Society for Engineering Education United States Arizona State University United States American Society for Engineering Education United States University of South Carolina United States Department of Mechanical Engineering University of South Carolina United States Graduate Studies Division Corporate Members Council College Industry Partnership Division American Society for Engineering Education United States Department of Chemical Engineering University of South Carolina United States Western Carolina University United States Kimmel School of Construction Management Engineering and Technology United States College of Applied Sciences Western Carolina University United States Graduate Studies Division American Society for Engineering Education United States Electronics Engineering Technology Program Kimmel School of Construction Management Engineering and Technology Western Carolina University United States Kimmel School of Construction Management Engineering and Technology Western Carolina University United States Rolls-Royce United States Rolls-Royce Corporation United States

No abstract available

关键词：

来源：评论

学校读者我要写书评

暂无评论

Parameter identification in two-dimensional fins using the boundary element method

引用

Numerical Heat Transfer;Part A: Applications 2006年第4期50卷 315-344页

作者： Marin, L. Wen, X. Elliott, L. Ingham, D.B. Lesnic, D. Heggs, P.J. School of Earth and Environment Environment Centre University of Leeds Leeds United Kingdom Department of Applied Mathematics University of Leeds Leeds United Kingdom School of Chemical Engineering and Analytical Science University of Manchester Manchester United Kingdom School of Mechanical Materials and Manufacturing Engineering University of Nottingham University Park Nottingham NG7 2RD United Kingdom

The identification of the ratio of the convective heat transfer coefficient and the thermal conductivity of two-dimensional polygonal fins on square and hexagonal (equilateraltriangular) pitches and the equivalent radial rectangular fin from a single additional boundary or internal temperature measurement is investigated. This problem is motivated by the facilities available at the University of Manchester, which at the moment make possible only a single temperature measurement, and is approached by combining the boundary element method (BEM) with a constrained nonlinear minimization technique. The accuracy, convergence, and stability of the proposed numerical method with respect to the level of noise added into the temperature measurement are carefully analyzed. The inaccuracy in the numerical results obtained using the combined BEM-constrained nonlinear minimization technique is around three and nine times less than the level of noise added into the extra temperature measurements located in the domain and on the boundary, respectively. The sensitivity analysis with respect to the location of the extra temperature measurement suggests that more accurate numerical approximates for the ratio of the convective heat transfer coefficient and the thermal conductivity of the fins investigated are retrieved for one additional boundary temperature measurement than for one extra internal temperature measurement. Furthermore, the BEM-constrained nonlinear minimization technique is also robust with respect to the initial guess for the minimization process. In addition, the inaccuracy in the prediction of the average of the space-dependent coefficient for only one additional internal or boundary temperature measurement ranges from 5.33% to 25.35%.

关键词： Temperature measurement

来源：评论

学校读者我要写书评

暂无评论

Parameter Stability of the Structural-Functional Model GREENLAB-Tomato as Affected by Plant Density and Biomass Data Acquisition

Parameter Stability of the Structural-Functional Model GREEN...

引用

International Symposium on Plant Growth Modeling and Applications (PMA)

作者： G. Louarn Q.X. Dong Y.M. Wang J.F. Barczi P. de Reffye Sino-French Laboratory of Informatics Automation and Applied Mathematics (LIAMA) Chinese Academy and Sciences Beijing China Department of Electronic Information College of Information and Electrical Engineering China Agricultural University Beijing China CIRAD UMR AMAP Montpellier France Digiplant Program INRIA Rocquencourt Le Chesnay France

In this study, we assessed the possibility of using the GREENLAB model to quantitatively simulate adaptive responses of tomato plants competing for light. The model was able to reproduce modifications induced by a reduction of plant spacing in dry matter production and in the allocation pattern. However, the analysis of parameter stability showed that some parameters were environment dependent and that an adjustment of model formalisms was required to explicitly represent the plant response. Model parameters also proved to be sensitive to the data acquisition procedure. We confirmed that target files composed of dry matter records lead to parameters that were better indicators of the carbohydrates metabolism at all densities.

关键词： Stability Bioinformatics Biomass Crops Predictive models Irrigation Production Data visualization Educational institutions Laboratories

来源：评论

学校读者我要写书评

暂无评论

Identifying and investigating difficult concepts in engineering mechanics and electric circuits

Identifying and investigating difficult concepts in engineer...

引用

113th Annual ASEE Conference and Exposition, 2006

作者： Streveler, Ruth Geist, Monica Ammerman, Ravel Sulzbach, Candace Miller, Ronald Olds, Barbara Nelson, Mary Colorado School of Mines United States Center for Engineering Education Colorado School of Mines United States Department of Academic Affairs University of Northern Colorado United States Applied Statistics and Research Methods Program University of Northern Colorado United States IEEE Divisio of Engineering Colorado School of Mines United States Society of Women Engineers American Society of Civil Engineers Tau Beta Pi United States ASCE Committee on Student Activities Department of Chemical Engineering Colorado School of Mines United States National Science Foundation Colorado School of Mines United States Department of Liberal Arts and International Studies Colorado School of Mines United States Division of Research Evaluation and Communication EHR Directorate of the National Science Foundation University of Colorado United States Research and Evaluation Methods University of Colorado Boulder United States

Two research questions motivated this study: "What important concepts in electric circuits and engineering mechanics do students find difficult to learn?" and "How can we describe students' mental models of the concepts identified in question 1?" This paper discusses the process used to identify difficult concepts in engineering mechanics and electric circuits, the results ofthat identification process, and the results of interviews to uncover the mental models engineering students use to explain these concepts. This study, part of the Center for the Advancement in engineering Education's "Scholarship of Learning engineering" element, builds on previous work in thermal and transport science and allows comparisons among difficult concepts in chemical engineering, mechanical engineering, and electrical engineering. © American Society for engineering Education, 2006.

关键词： engineering education

来源：评论

学校读者我要写书评

暂无评论

Misconceptions about rate processes: Preliminary evidence for the importance of emergent conceptual schemas in thermal and transport sciences

Misconceptions about rate processes: Preliminary evidence fo...

引用

113th Annual ASEE Conference and Exposition, 2006

作者： Miller, Ronald Streveler, Ruth Olds, Barbara Chi, Michelene Nelson, Mary Geist, Monica Colorado School of Mines United States Department of Chemical Engineering Colorado School of Mines United States Center for Engineering Education Colorado School of Mines United States Academic Affairs National Science Foundation Colorado School of Mines United States Liberal Arts and International Studies Colorado School of Mines United States Division of Research Evaluation and Communication EHR Directorate of the National Science Foundation University of Pittsburgh United States Learning Research and Development Center United States Department of Psychology University of Pittsburgh United States University of Colorado United States University of Northern Colorado United States Applied Statistics and Research Methods Program University of Northern Colorado United States

This paper reports preliminary evidence that a significant number of engineering students possess robust misconceptions about rate processes such as transfer of heat even after years of study in thermal and transport sciences including fluid mechanics, heat transfer, and thermodynamics. Data from the Thermal and Transport Concept Inventory (TTCI) currently under development and additional questions specifically written for the present study are reported and analyzed. Results indicate the presence of a persistent misconception about the relationship between the rate of heat transfer and amount of energy transferred in processes of engineering interest. We use the emergent theory developed by Chi and colleagues to propose a possible explanation for these findings. © American Society for engineering Education, 2006.

关键词： engineering education

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：