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Institution

California State University, Long Beach

EducationLong Beach, California, United States
About: California State University, Long Beach is a education organization based out in Long Beach, California, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 10036 authors who have published 13933 publications receiving 377394 citations. The organization is also known as: Cal State Long Beach & Long Beach State.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a theoretical analysis of the errors arising from volumetric compliance in cyclic liquefaction tests on saturated sands is presented, showing that compliance occurs with changes in membrane thickness, membrane stretch in corners, and expansion of the confining frame as pore-water pressures increase.
Abstract: A theoretical analysis of the errors arising from volumetric compliance in cyclic liquefaction tests on saturated sands is presented. For cyclic simple shear tests, compliance occurs with changes in membrane thickness, membrane stretch in corners, and expansion of the confining frame as pore-water pressures increase. For cyclic triaxial tests, compliance arises from reductions in membrane penetration. Compliance is shown to cause significant increases in stress ratios causing initial liquefaction. For triaxial tests, computations indicate that measured increases in stress ratios causing initial liquefaction with increase in grain size are primarily attributable to the effects of membrane penetration. The compliance effect arising from partial saturation is also examined, and significant increases in stress ratios causing initial liquefaction with only small reductions from full saturation are shown to occur. The difficulties of eliminating the effects of system compliance from undrained liquefaction tests suggest the use of constant volume simple shear liquefaction tests where drained samples are tested under constant volume conditions.

95 citations

Proceedings ArticleDOI
14 May 2016
TL;DR: The results of a qualitative study exploring requirements engineering practitioners’ perceptions and attitudes towards sustainability suggest the need for focused efforts in sustainability education, but also a need to rethink professional norms and practices.
Abstract: Sustainability is now a major concern in society, but there is little understanding of how it is perceived by software engineering professionals and how sustainability design can become an embedded part of software engineering process. This paper presents the results of a qualitative study exploring requirements engineering practitioners' perceptions and attitudes towards sustainability. It identifies obstacles and mitigation strategies regarding the application of sustainability design principles in daily work life. The results of this study reveal several factors that can prevent sustainability design from becoming a first class citizen in software engineering: software practitioners tend to have a narrow understanding of the concept of sustainability; organizations show limited awareness of its potential opportunities and benefits; and the norms in the discipline are not conducive to sustainable outcomes. These findings suggest the need for focused efforts in sustainability education, but also a need to rethink professional norms and practices.

95 citations

Journal ArticleDOI
13 Mar 2020
TL;DR: The research results indicate that Residential and commercial sectors have adopted these tools the most, compared to other sectors and institutional and transportation sectors had the highest growth from 2017 to 2018.
Abstract: With advances in Building Information Modeling (BIM), Virtual Reality (VR) and Augmented Reality (AR) technologies have many potential applications in the Architecture, Engineering, and Construction (AEC) industry. However, the AEC industry, relative to other industries, has been slow in adopting AR/VR technologies, partly due to lack of feasibility studies examining the actual cost of implementation versus an increase in profit. The main objectives of this paper are to understand the industry trends in adopting AR/VR technologies and identifying gaps within the industry. The identified gaps can lead to opportunities for developing new tools and finding new use cases. To achieve these goals, two rounds of a survey at two different time periods (a year apart) were conducted. Responses from 158 industry experts and researchers were analyzed to assess the current state, growth, and saving opportunities for AR/VR technologies for the AEC industry. The findings demonstrate that older generations are significantly more confident about the future of AR/VR technologies and they see more benefits in AR/VR utilization. Furthermore, the research results indicate that Residential and commercial sectors have adopted these tools the most, compared to other sectors and institutional and transportation sectors had the highest growth from 2017 to 2018. Industry experts anticipated a solid growth in the use of AR/VR technologies in 5 to 10 years, with the highest expectations towards healthcare. Ultimately, the findings show a significant increase in AR/VR utilization in the AEC industry from 2017 to 2018.

95 citations

BookDOI
16 Mar 2010
TL;DR: Introduction to MATLAB(R), Simulink (R), and Simscape(R) Matlab Command Window and Command Prompt User-Defined Functions and Script Files Defining and Evaluating Functions Iterative Calculations Matrices and Vectors Differentiation and Integration Plotting in MATLAB Simulinks Simscape.
Abstract: Introduction to MATLAB(R), Simulink(R), and Simscape(R) Matlab Command Window and Command Prompt User-Defined Functions and Script Files Defining and Evaluating Functions Iterative Calculations Matrices and Vectors Differentiation and Integration Plotting in MATLAB Simulink Simscape Complex Analysis, Differential Equations, and Laplace Transformation Complex Analysis Differential Equations Laplace Transformation Summary Matrix Analysis Vectors and Matrices Solution of Linear Systems of Equations Matrix Eigenvalue Problem Summary System Model Representation Configuration Form State-Space Form Input-Output Equation, Transfer Function Relations between State-Space Form: Input-Output Equation and Transfer Matrix Block Diagram Representation Linearization Summary Mechanical Systems Mechanical Elements Translational Systems Rotational Systems Mixed Systems: Translational and Rotational Gear-Train Systems System Modeling with Simulink and Simscape Summary Electrical, Electronic, and Electromechanical Systems Electrical Elements Electric Circuits Operational Amplifiers Electromechanical Systems Impedance Methods System Modeling with Simulink and Simscape Summary Fluid and Thermal Systems Pneumatic Systems Liquid-Level Systems Thermal Systems System Modeling with Simulink and Simscape Summary System Response Types of Response Transient Response and Steady-State Response Transient Response of Second-Order Systems Frequency Response Solving the State Equation Response of Nonlinear Systems Summary Introduction to Vibrations Free Vibration Forced Vibration Vibration Suppressions Modal Analysis Vibration Measurement and Analysis Summary Introduction to Feedback Control Systems Basic Concepts and Terminologies Stability and Performance Benefits of Feedback Control Proportional-Integral-Derivative Control Root Locus Bode Plot Full-State Feedback Integration of Simulink and Simscape into Control Design Summary Bibliography Appendix A Appendix B: Useful Formulas Index

95 citations

Journal ArticleDOI
TL;DR: In this paper, the acid base and coordination chemistry of histidine can be controlled to promote the formation of open architectures with bridging histidine ligands instead of the commonly observed metal−chelates with chelating H2O ligands.
Abstract: Despite there being numerous examples of metal−organic frameworks in which metal centers or clusters are joined together by bi- or polydentate ligands into extended structures, biologically important amino acids, histidine in particular, are rarely known to serve as bridging ligands for the construction of open-framework architectures. Here, we report hydrothermal self-assembly between neutral zwitterionic histidine molecules and inorganic secondary building units (i.e., (Zn−O−P−O)2 four-rings) into a crystalline solid containing infinite two-dimensional arrays. We demonstrate that the acid−base and coordination chemistry of histidine can be controlled to promote the formation of open architectures with bridging histidine ligands instead of the commonly observed metal−chelates with chelating histidine ligands. Crystallographic data for Zn(HPO3)(dl-C6H9N3O2)(H2O)1/2, C2/c, a = 15.1307(3) A, b = 8.4230(2) A, c = 16.6322(4) A, β = 100.420(1)°, V = 2084.75(8) A3, Z = 8.

95 citations


Authors

Showing all 10093 results

NameH-indexPapersCitations
David A. Weitz1781038114182
Menachem Elimelech15754795285
Josh Moss139101989255
Ron D. Hays13578182285
Matthew J. Budoff125144968115
Harinder Singh Bawa12079866120
Kamyar Kalantar-Zadeh118102556187
Dionysios D. Dionysiou11667548449
Kathryn Grimm11061847814
Richard B. Kaner10655766862
William Oh10086748760
Nosratola D. Vaziri9870834586
Jagat Narula9897847745
Qichun Zhang9454028367
Muhammad Shahbaz92100134170
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202324
202260
2021663
2020638
2019578
2018536