检索结果-内蒙古大学图书馆

Uncertainity quantification for atomistic reaction models: An equation-free stochastic simulation algorithm example

Multiscale Modeling and Simulation 2007年第4期6卷 1217-1233页

作者： Zou, Yu Keverekidis, Ioannis G. Citigroup 388 Greenwhich Street New York NY 10013 United States Department of Chemical Engineering and Program in Applied and COmputational Mathematics Princeton University Princeton NJ 08544 United States

We describe a computational framework linking uncertainty quantification (UQ) methods for continuum problems depending on random parameters with equation-free (EF) methods for performing continuum deterministic numerics by acting directly on atomistic/stochastic simulators. Our illustrative example is a heterogeneous catalytic reaction mechanism with an uncertain atomistic kineticparameter;the "inner" dynamic simulator of choice is a Gillespie stochastic simulation algorithm(SSA). We demonstrate UQ computations at the coarse-grained level, in a nonintrusive way, throughthe design of brief, appropriately initialized computational experiments with the SSA code. The system is thus observed at three levels: (a) a fine scale for each stochastic simulation at each value of the uncertain parameter;(b) an intermediate coarse-grained state for the expected behavior of the SSA at each value of the uncertain parameter;and (c) the desired fully coarse-grained level: distributions of the coarse-grained behavior over the range of uncertain parameter values The latter are computed in the form of generalized polynomial chaos (gPC) coefficients in terms of the random parameter. Coarse projective integration and coarse fixed point computation are employed to accelerate the computational evolution of these desired observables, to converge on random stable/ unstable steady states, and to perform parametric studies with respect to other (nonrandom) system parameters. © 2008 Society for Industrial and applied mathematics.

关键词： Stochastic systems

来源：评论

学校读者我要写书评

暂无评论

Enhance antenna bandwidth by using high permittivity ceramic and FR4 stacked structure

Enhance antenna bandwidth by using high permittivity ceramic...

引用

2007 IEEE Antennas and Propagation Society International Symposium, AP-S

作者： Yang, C.F. Tzou, W.C. Tsai, J.H. Chen, H.M. Lin, Y.F. Department of Chemical and Materials Engineering National University of Kaohsiung Kaohsiung Taiwan Department of Electro-Optical Engineering Southern Taiwan University Tainan Taiwan Department of Mathematics and Physics Chinese Air Force Academy Kangshan Kaohsiung 820 Taiwan Institute of Photonics and Communications National Kaohsiung University of Applied Sciences Kaohsiung Taiwan

No abstract available

ISBN: (纸本)1424408776

No abstract available

关键词：

来源：评论

学校读者我要写书评

暂无评论

Temperature control via robust compensation of heat generation: Isoparaffin/olefin alkylation

引用

Lecture Notes in Control and Information Sciences 2007年 361卷 33-51页

作者： Carrizales-Martínez, G. Femat, R. González-Álvarez, V. Division of Postgraduate Studies and Research I.T.C.M. Mexico Department of Applied Mathematics and Computational Systems IPICyT Mexico Department of Chemical Engineering UdG Mexico

ISBN: (纸本)3540731873

The temperature control of the heterogeneous alkylation, where H 2SO4 is used as catalyst, is discussed in this paper. The problem is to design a control function to stabilize temperature in face of uncertain kinetic model. The proposed controller, whose structure resembles a PI-controller, is based on energy balance. The resulting feedback controller is robust, leads to an acceptable performance, and computes the temperature of the coolant from the refrigeration section to the reactor. The effectiveness and robustness of the designed controller for computing the coolant temperature is tested by means of simulations in such a manner that we study the effects of: (i) load disturbances, (ii) model uncertainties and (iii) initial conditions for estimation values. © 2007 Springer-Verlag Berlin Heidelberg.

关键词： Alkylation

来源：评论

学校读者我要写书评

暂无评论

Evolution in LTPS AMLCD manufacturing via advances in laser crystallization techniques and systems

引用

Information Display 2007年第9期23卷 14-18页

作者： Im, James S. Limanov, A.B. Van Der Wilt, P.C. Chung, U.J. Chitu, A.M. Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University 500 W. 120th St. 1106A Mudd New York NY 10027-6623

Substantial R&D activities are presently under way toward the development of advanced pulsed-laser-based production tools and processes that can enable sophisticated yet effective crystallization of Si films for manufacturing advanced active-matrix liquid-crystal displays (AMLCDs) that utilize poly crystalline-Si films. Implementation of such techniques in volume production, which has actually already begun, is poised to potentially permit low-tempe rature polycrystalline-Si (LTPS) AMLCD technology to pursue a more aggressive product and manufacturing roadmap. © SID 2007.

关键词： Pulsed laser applications

来源：评论

学校读者我要写书评

暂无评论

Work in progress - Instructor credibility: An analysis of engineering students’ reflective writing for evidence of attitude shifts

Work in progress - Instructor credibility: An analysis of en...

引用

Frontiers in Education (FIE) Conference

作者： Linda L. Lindsley Veronica A. Burrows Science and Engineering if Materials Program Arizona State University Tempe USA Center for Research on Education in Science Mathematics Engineering and Technology and Department of Chemical Engineering Arizona State University Tempe USA

It is a common, puzzling, and often disheartening experience for teachers at all levels to realize that they may have little credibility in the eyes of their students, especially regarding the applicability of the lessons taught in the classroom to 'real world' situations. This paper analyzes the results of using a reflective writing/research paper in a freshman engineering design course to assist students in making real world connections to classroom topics. In addition to writing a standard research paper on topics related to engineering design, students were required to write a personal reflection on the assignment before and after its completion. Comparisons of these pre-assignment and post-assignment reflections show a substantial shift in the students' attitudes toward the credibility of their instructor and the choice of curriculum and topics for the course. The results also show that students spent time in metacognitive reflection on their own beliefs about the applicability of course work to the world of the working engineer. While not every student experienced these attitude shifts, review of these papers did show a substantial enough positive shift occurred through this writing process to promote further research in this area.

关键词： Writing Design engineering Reflection Process design engineering students Eyes chemical engineering Electric breakdown Books Problem-solving

来源：评论

学校读者我要写书评

暂无评论

Work in Progress - Changes in Secondary School Teachers' Attitudes Following a Course in engineering Design

Work in Progress - Changes in Secondary School Teachers' Att...

引用

37th Annual Frontiers in Education Conference (FIE 2007), vol.4

This paper discusses the changes in attitudes about engineering before and after an introductory course in engineering design offered to in-service secondary math and science teachers. The course is part of a series of courses offered through the NSF-sponsored MSP (Math and Science Partnership): Project Pathways designed to help integrate mathematic and science and can be taken as partial fulfillment of a Master's degree in Science/Math Education. An attitude survey based on the well-documented PFEAS (Pittsburgh Freshmen engineering Attitude Survey) was administered to the teachers taking the course. The survey was given at the beginning and end of the Fall 2006 semester. The greatest difference in the teachers' attitudes was in the area of engineering being perceived as an exact science. On a 5-point Likert scale, the teachers' mean responses to the group of questions regarding engineering being perceived as an exact science had a statistically significant mean difference of -.68, p<.01. The teachers showed significant differences on three other scales as well (engineering compatibility, confidence in basic engineering knowledge and skills, and overall computer skills). Additional open-ended questions showed a gain in the teachers' general knowledge about engineering as a profession and their ability to recognize students in their courses that might be successful as engineering students following their graduation from high school.

关键词： Attitudes engineering design K-12 education Teachers

来源：评论

学校读者我要写书评

暂无评论

A weighted k-nearest neighbor method for gene ontology based protein function prediction

A weighted k-nearest neighbor method for gene ontology based...

引用

2nd International Multi-Symposiums on Computer and Computational Sciences 2007, IMSCCS'07

作者： Kharsikar, Saket Mugler, Dale Sheffer, Daniel Moore, Francisco Duan, Zhong-Hui Department of Biomedical Engineering University of Akron Akron OH 44236 United States Department of Theoretical and Applied Mathematics University of Akron Akron OH 44236 United States Integrated Bioscience PhD Program University of Akron Akron OH 44236 United States Department of Biology University of Akron Akron OH 44236 United States Department of Computer Science University of Akron Akron OH 44236 United States

ISBN: (纸本)0769530397

Numerous genome projects have produced a large and ever increasing amount of genomic sequence data. However, the biological functions of many proteins encoded by the sequences remain unknown. Protein function annotation and prediction become an essential and challenging task of post-genomic research. In this paper, we present an automated protein function prediction system based on a set of proteins of known biological functions. The functions of the proteins are characterized with gene ontology (GO) annotations. The prediction system uses a novel measure to calculate the pair-wise overall similarity between protein sequences. The protein function prediction is performed based on the GO annotations of similar sequences using a weighted k-nearest neighbor method. We show the prediction accuracies obtained using the model organism yeast (Sacchyromyces cerevisiae). The results indicate that the weighted k-nearest neighbor method significantly outperforms the regular k-nearest neighbor method for protein molecular function prediction. © 2007 IEEE.

关键词： Proteins

来源：评论

学校读者我要写书评

暂无评论

Work in progress - engineering the magic school creativity and innovation in context

Work in progress - Engineering the magic school creativity a...

引用

Frontiers in Education (FIE) Conference

作者： M.A. Papalaskari Karen Hess Anthony Lagalante Najib Nadi Robert Styer Thomas Way Randy Weinstein Department of Computing Sciences Villanova University USA Science and Theatre Magic Program Department of Chemistry Villanova University USA Department of Mathematics Villanova University USA Department of Chemical Engineering Villanova University USA

We review the past three years of our experience and results from the Villanova PIVOTS Science & Theatre Magic program, a 3-week academic summer program where students and faculty work with teams of teenagers to apply scientific principles in the creation and staging of a "School of Magic" - a fantastic day-long adventure that they then share with younger, underprivileged children. The teens act as guides/teachers (and powerful role models), and deliver science-inspired "magic lessons." Hundreds of younger children, many from economically impoverished urban neighborhoods, have visited the magic school that the teenagers created. The foundations of the program rest on a novel combination of features, each of demonstrated pedagogic value and critical to the preparation of a globalization-ready science and engineering workforce: 1) Integration of STEM with theatre and creative arts; 2) Service learning; and 3) Multidisciplinary exploration with a clear design focus. A partnership between academia, industry, government, non-profit organizations, and K-20 educators was created through this initiative, enabling the program to evolve and embrace complementary goals for diverse populations of students and faculty, entailing new challenges and opportunities.

关键词： Educational institutions Technological innovation Art Design engineering Government Power generation economics Books Chemistry chemical engineering

来源：评论

学校读者我要写书评

暂无评论

Pore space characterization by NMR using 3D inverse Laplace relaxometry/diffusivity experiments

引用

Magnetic Resonance Imaging 2007年第4期25卷 588-589页

作者： K.E. Washburn C.H. Arns T. Senden P.T. Callaghan MacDiarmid Institute for Advanced Materials and Nanotechnology School of Chemical and Physical Sciences Victoria University of Wellington New Zealand Department of Applied Mathematics Research School of Physical Sciences and Engineering Australian National University Canberra

来源：评论

学校读者我要写书评

暂无评论

Method of Calibrating Response Statistics for ML Estimation of 3D Interaction Position in a Thick-Detector Gamma Camera

Method of Calibrating Response Statistics for ML Estimation ...

引用

2007 IEEE Nuclear Science Symposium Conference, vol.11

作者： William C. J. Hunter Harrison H. Barrett Lars R. Furenlid Stephen K. Moore Department of Physics and is now appointed in the Department of Radiology University of Arizona Tucson AZ USA Department of Radiology the College of Optical Sciences the Applied Mathematics Program and the Biomedical Engineering Program University of Arizona Tucson Tucson AZ USA Department of Radiology the College of Optical Sciences and the Biomedical Engineering Program University of Arizona Tucson Tucson AZ USA Biomedical Engineering Program University of Arizona Tucson Tucson AZ USA

High-energy photon detectors are often made thick in order to improve their photon-detection efficiency. To avoid issues of parallax and increased signal variance that result from random interaction depth, we must determine the 3D interaction position in the imaging detector. With this goal in mind, we examine a method of calibrating response statistics of a thick-detector gamma camera to produce a maximum- likelihood estimate of 3D interaction position. We parameterize the mean detector response as a function of 3D position and estimate the parameters by maximizing their likelihood given prior knowledge of the path-length distribution and a complete list of camera signals for an ensemble of gamma-ray interactions. Demonstrating this calibration method with simulated gamma-camera data, we show that the resulting calibration is accurate and can be used to produce unbiased estimates of 3D interaction position.

关键词： Statistics Maximum likelihood estimation Cameras Calibration Optical imaging Statistical distributions Maximum likelihood detection Gamma ray detection Gamma ray detectors Parameter estimation

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：