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Full-Text Articles in Engineering

Series Solution Of The Autocatalytic Hydrolysis Of Cellulose, Rou-Xi Chen, Zhi Liu, Ji-Huan He Dec 2104

Series Solution Of The Autocatalytic Hydrolysis Of Cellulose, Rou-Xi Chen, Zhi Liu, Ji-Huan He

Ji-Huan He

The chemical degradation kinetics of
cellulose is of scientific interest, as well as its practical
importance in many industrial activities for optimal
design. Much work has been done recently to understand
the depolymerizaton of cellulose in homogeneous
acidic medium on the assumption of
autocatalytic hydrolysis with a positive feedback of
acid production from the degraded biopolymer. Series
solutions are obtained for concentrations of cellulose
chains and degraded cellulose chains by Taylor series
and variational iteration method. Depolymerization of
cellulose strongly depends upon the initial conditions,
and the concentration of cellulose chains changes
exponentially with a linear and square/cubic time ...


An Analysis Of The Barriers To And Drivers Of Green Public Procurement In Achieving A More Sustainable Construction Industry, Myles Keaveney, Paul Butler Mar 2104

An Analysis Of The Barriers To And Drivers Of Green Public Procurement In Achieving A More Sustainable Construction Industry, Myles Keaveney, Paul Butler

Conference papers

The public sector in Ireland possesses enormous purchasing power which has the strength to affect production and consumption trends in all market sectors. Environmental purchasing tools such as Green Public Procurement (GPP) are seen by many as the solution to greener purchasing decisions in order to obtain and maintain not only a more sustainable construction sector but also a more sustainable economy. The purpose of this research is to determine and examine the key barriers to and drivers of implementing GPP in public procurement departments in order to reduce the effect construction works have on the environment. There was limited ...


Analysis Of Nonequilibrium Hcp Precipitate Growth In Fcc Matrices: Application To Al–Ag, Daniel Finkenstadt, Duane Johnson Nov 2029

Analysis Of Nonequilibrium Hcp Precipitate Growth In Fcc Matrices: Application To Al–Ag, Daniel Finkenstadt, Duane Johnson

Duane D. Johnson

Hexagonal-close-packed (hcp) γ-precipitates with large aspect ratios form rapidly in some face-centered cubic (fcc) solid-solutions. No model explains the observed time-dependent increase in aspect ratio, nor irregular intermediate growth shapes. We propose a nonequilibrium process involving trapezoidal offshoots (controlled only by energetics) that governs the growth behavior (kinetics) and yields nonequilibrium structures in agreement with observation. Then, combining nucleation theory and diffusion-limited growth both of secondary nuclei and ledges, we derive a general growth equation for γ-precipitates due to solute-segregation to precipitate–matrix interfaces that includes our modification of the Jones–Trivedi model for thickening to account for the slow ...


Cmmi High Maturity, Jack Calis Jan 2021

Cmmi High Maturity, Jack Calis

Jack Calis

Software Education Service in Asia, Europe and Africa, CMMI High Maturity based process of software process consultants and training in by CMMI-High Maturity.


Agen Bola Terpercaya Warung757.Net, Defaonline Blog May 2017

Agen Bola Terpercaya Warung757.Net, Defaonline Blog

defaonline blog

Agen Bola Terpercaya Warung757.net- Sebuah impian untuk menggapai cinta dari pertaruhan Bola Terpercaya Warung757.net yang mana situs ini memang benar-benar situs Judi Bola Online yang patut untuk di jadikan naungan dalam bertaruh judi bola online, Anda akan mendapatkan antusias yang luar biasa dari sekian banyak member yang sudah bergabung dengannya, Itu berarti anda akan menjadi tawanan pertaruhan bola dalam situs judi online terpercaya ini, Mengingat anda adalah spesialis pecinta judi bola dalam beberapa event persepakbolaan di dunia.
Hadir lagi sebuah event 5 tahunan yaitu Piala Euro 2016 yang akan di gelar di perancis nantinya, Ini akan membuat ramai ...


Pavements Analysis And Design, Yang Huang, Kamyar Mahboub Dec 2016

Pavements Analysis And Design, Yang Huang, Kamyar Mahboub

Kamyar C. Mahboub

No abstract provided.


Power Requirements Of Biogas Upgrading By Water Scrubbing And Biomethane Compression: Comparative Analysis Of Various Plant Configurations, Wojciech M. Budzianowski, Christophe E. Wylock, Przemysław A. Marciniak Dec 2016

Power Requirements Of Biogas Upgrading By Water Scrubbing And Biomethane Compression: Comparative Analysis Of Various Plant Configurations, Wojciech M. Budzianowski, Christophe E. Wylock, Przemysław A. Marciniak

Wojciech Budzianowski

Biogas upgrading by water scrubbing followed by biomethane compression is an environmentally benign process. It may be achieved using various plant configurations characterised by various power requirements with associated effects on biomethane sustainability. Therefore, the current study has been undertaken to systematically investigate the power requirements of a range of water scrubbing options. Two groups of water scrubbing are analysed: (1) high pressure water scrubbing (HPWS) and (2) near-atmospheric pressure water scrubbing (NAPWS). A water scrubbing plant model is constructed, experimentally validated and simulated for seven upgrading plant configurations. Simulation results show that the power requirement of biogas upgrading in ...


Total Chain Integration Of Sustainable Biorefinery Systems, Wojciech M. Budzianowski, Karol Postawa Dec 2016

Total Chain Integration Of Sustainable Biorefinery Systems, Wojciech M. Budzianowski, Karol Postawa

Wojciech Budzianowski

Biorefineries are increasingly important commercial facilities for the production of biofuels, biopower and various biomaterials from biomass with potentials to displace several existing industries currently based on polluting and finite fossil resources. Biorefinery systems consist of biorefinery facilities and their entire value chain. Integration of biorefinery systems aims at optimising the use of energies and materials in the total chain from biomass plantations to end product utilisation and is therefore capable of successfully improving economic viability and sustainability of biorefineries. Total Chain Integration can minimise capital and operating expenditures, maximise the quality, quantity and value of biorefinery bioproducts as well ...


Evolutionary View Planning For Optimized Uav Terrain Modeling In A Simulated Environment, Ronald A. Martin, Ivan Rojas, Kevin W. Franke, John Hedengren Dec 2016

Evolutionary View Planning For Optimized Uav Terrain Modeling In A Simulated Environment, Ronald A. Martin, Ivan Rojas, Kevin W. Franke, John Hedengren

All Faculty Publications

This work demonstrates the use of genetic algorithms in optimized view planning for 3D reconstruction applications using small unmanned aerial vehicles (UAVs). The quality of UAV site models is currently highly dependent on manual pilot operations or grid-based automation solutions. When applied to 3D structures, these approaches can result in gaps in the total coverage or inconsistency in final model resolution. Genetic algorithms can effectively explore the search space to locate image positions that produce high quality models in terms of coverage and accuracy. A fitness function is defined, and optimization parameters are selected through semi-exhaustive search. A novel simulation ...


Proton Therapy Facility Shielding, Hadyn M. Daugherty, Isaac C. Waaldschlager, Daniel S. Elkins, Alyxandria Wszolek, Rachel N. Gaudet Dec 2016

Proton Therapy Facility Shielding, Hadyn M. Daugherty, Isaac C. Waaldschlager, Daniel S. Elkins, Alyxandria Wszolek, Rachel N. Gaudet

University of Tennessee Honors Thesis Projects

No abstract provided.


Accelerator Shielding For A Bee Hive Irradiator, Robert F. Turner, Matthew O'Neil, Victoria Martin, Saya Rutherford, Danielle Mcfall, Ali Buhamad Dec 2016

Accelerator Shielding For A Bee Hive Irradiator, Robert F. Turner, Matthew O'Neil, Victoria Martin, Saya Rutherford, Danielle Mcfall, Ali Buhamad

University of Tennessee Honors Thesis Projects

No abstract provided.


Rural School Wastewater Treatment System, Parker J. Dulin, Payton M. Smith, James W. Swart Dec 2016

Rural School Wastewater Treatment System, Parker J. Dulin, Payton M. Smith, James W. Swart

University of Tennessee Honors Thesis Projects

No abstract provided.


Stress Singularity Study Of Functionally Graded Material Based On Coherent Gradient Sensing Method, Jinjun Zhang Nov 2016

Stress Singularity Study Of Functionally Graded Material Based On Coherent Gradient Sensing Method, Jinjun Zhang

Kevin Lee


Functionally graded material (FGM) has some particular characteristics due to the gradual variation of physical properties. The study on mechanical behavior of FGM is of great research value. In this work, a large scale FGM which filled with small glass spheres has been prepared by gravity assisted casting technique. The elastic material constants in static condition are measured. One optical experimental method, coherent gradient sensing (CGS), is introduced to study the mechanical behavior of FGM which has exponential variation of material property. The governing equations of CGS which is used to represent the optics-mechanics relation of the singular yield near ...


A Beginner’S Guide To Controller Area Network Bus Access In Modern Vehicles, Kevin Mcfall, T. Fisher Nov 2016

A Beginner’S Guide To Controller Area Network Bus Access In Modern Vehicles, Kevin Mcfall, T. Fisher

Kevin McFall

A controller area network (CAN) is a communication system designed so that a microcontroller governing multiple
systems (nodes) on the network can function effectively. This network can be accessed, interpreted, and manipulated by an external computer. The purpose of this paper is to provide a basic working knowledge of CAN architecture and protocols, as well as show how to connect to and decode a vehicular controller area network.


Analysis Of Genetic Diversity Using Simple Sequence Repeat (Ssr) Markers And Growth Regulator Response In Biofield Treated Cotton (Gossypium Hirsutum L.), Mahendra Trivedi Nov 2016

Analysis Of Genetic Diversity Using Simple Sequence Repeat (Ssr) Markers And Growth Regulator Response In Biofield Treated Cotton (Gossypium Hirsutum L.), Mahendra Trivedi

Mahendra Kumar Trivedi

Cotton is the most important crop for the production of fiber that plays a key role in economic and social affairs. The aim of the study was to evaluate the impact of biofield energy treatment on cotton seeds regarding its growth, germination of seedling, glutathione (GSH) concentration, indole acetic acid (IAA) content and DNA fingerprinting using simple sequence repeat (SSR) markers for polymorphism analysis. The seeds of cotton cv. Stoneville-2 (Gossypium hirsutum L.) was obtained from DNA Land Marks Inc., Canada and divided into two groups. One group was remained as untreated, while the other was subjected to Mr. Trivedi ...


Composite Metallic Nanofoam Structures, David Bahr, Matthew Howard, Mohamad Zbib, Raheleh Rahimi, John Balk Nov 2016

Composite Metallic Nanofoam Structures, David Bahr, Matthew Howard, Mohamad Zbib, Raheleh Rahimi, John Balk

Composites at Lake Louise (CALL 2015)

Metallic nanofoams made of metals such as nickel (Ni) or gold (Au) with ligament sizes on the order of 10’s to 100’s of nm’s exhibit several remarkable properties as a consequence of their low relative density and high specific surface area, such as outstanding strength to weight ratios, enhanced plasmonic behavior and size-effect-enhanced catalytic behavior. However, these metallic nanofoams suffer from macroscopically brittle behavior due to plastic deformation in individual ligaments. With little or no barriers for slip, work-hardening is not possible within ligaments and extremely localized plasticity, once initiated, leads to a few ligaments necking and ...


Characterization And Modeling To Design And Develop Tailored-Property Filled Glass Composites, Kevin Ewsuk Nov 2016

Characterization And Modeling To Design And Develop Tailored-Property Filled Glass Composites, Kevin Ewsuk

Composites at Lake Louise (CALL 2015)

Particle-filled-glass composites (FGCs) are being developed as new materials with structure and properties engineered for materials joining (e.g., for solid oxide fuel cells). Relative to conventional sealing glasses used to make hermetic glass-to-metal (GtM) seals, FGCs with tailored properties offer significant potential as more crack resistant hermetic seals with better performance and reliability. Additionally, compared to process sensitive crystallizable glasses, FGCs offer broader processing latitude and robustness, and afford greater control of seal microstructure and properties. FGCs are being developed using a combination of fundamental materials science and materials engineering, employing: 1) experimentally-validated molecular modeling to better understand and ...


Powerful Artificial Muscles For Morphing Composites And Other Applications, Ray Baughman Nov 2016

Powerful Artificial Muscles For Morphing Composites And Other Applications, Ray Baughman

Composites at Lake Louise (CALL 2015)

Three successive generations of twist-spun artificial muscles are described and used to make morphing composites and textiles that are electrically, thermally, or chemically powered.1 Our first generation of twist-spun muscles, which are electrochemically powered by volume changes induced by double-layer charge injection, provide torsional rotation speeds of 590 rpm, and torsional strokes of 250° per millimeter of actuator length, which is 1000 times that for earlier artificial muscles. Our second generation muscles, which require no electrolyte and are based on guest-infiltrated carbon nanotube yarns, can torsionally actuate at 11,500 rpm and deliver 85 times higher power density during ...


Deterministic Three-Dimensional Composite Structures For Energy Storage, Paul Brown Nov 2016

Deterministic Three-Dimensional Composite Structures For Energy Storage, Paul Brown

Composites at Lake Louise (CALL 2015)

Through mesoscale design of a 3D current collector, high power density and high energy density primary and secondary (rechargeable) large format and microbatteries (Figure 1) were fabricated. At the most fundamental level, mesostructuring enables optimization of the trade-off between energy and power density in energy storage systems due to unavoidable ohmic and other losses that occur during charge or discharge. Of course, it is at fast charge and discharge, where these effects are most important. By efficient design of the ion and electron transport pathways, we and others have shown it is possible to significantly improve the power-energy relationship. We ...


Diffusion-Based Deformation In Elevated Temperature Micropillar Compression Of Mg-Nb Multilayers, Keith Thomas, Juri Wehrs, Siddharta Pathak, Johann Michler Oct 2016

Diffusion-Based Deformation In Elevated Temperature Micropillar Compression Of Mg-Nb Multilayers, Keith Thomas, Juri Wehrs, Siddharta Pathak, Johann Michler

Nanomechanical Testing in Materials Research and Development V

multilayer, elevated-temperature, micropillar compression


Indentation Behavior Of Superelastic Hard Carbon, Olga Chernogorova, Ekaterina Drozdova, Iraida Ushakova, Evgenii Ekimov, Vicente Benavides, Aleksander Soldatov Oct 2016

Indentation Behavior Of Superelastic Hard Carbon, Olga Chernogorova, Ekaterina Drozdova, Iraida Ushakova, Evgenii Ekimov, Vicente Benavides, Aleksander Soldatov

Nanomechanical Testing in Materials Research and Development V

Supererlastic hard carbon particles up to 1 mmin size were produced by fullerene collapse upon high-pressure high-temperature treatment with simultaneous sintering of metal-matrix composite materials (CM) reinforced by such particles. The hardness of carbon particles can be varied in a wide range by changing the parameters of their structure, which consists of curved graphene planes or their packets of different sizes. Such carbon phase was called “nanoclusterd graphene phase” (NGP) [1]. The properties of the carbon particles were controlled by changing treatment pressure (5 and 8 GPa) and temperature (1100-1800 K), composition of parent fullerites (C60 or C60/70), and ...


Ratcheting Limit Assessment Of Straight Pipes Subjected To Combinedinternal Pressure And Reversed Bending Moments.Pdf, Xiaotao Zheng Sep 2016

Ratcheting Limit Assessment Of Straight Pipes Subjected To Combinedinternal Pressure And Reversed Bending Moments.Pdf, Xiaotao Zheng

Kevin Lee


Analytical ratcheting limits of straight pipes subjected to typical steady internal pressure and reversed bending were deduced theoretically according to the Non-Cyclic Method. The effects of radius ratio as well as strain hardening behavior on ratcheting limit of cylindrical pipes were investigated intensively. Results revealed that the analytical ratcheting limits have higher precision than those results obtained by KTA/ASME and RCC-MR code, while the proposed results are still conservative comparing with the experiment data because the strain hardening behavior was not considered.Furthermore, flow stress solutions were formulated considering the effect of strain hardening behavior. Results presented flow stress ...


Low Power Class B Power Amplifier For Healthcare Application, Wei Cai Sep 2016

Low Power Class B Power Amplifier For Healthcare Application, Wei Cai

Heng Gu


The objective of this research was to design a 2.4 GHz class AB Power Amplifier (PA), with 0.18um Semiconductor Manufacturing International Corporation (SMIC) CMOS technology by using Cadence software, for health care applications. The ultimate goal for such application is to minimize the trade-offs between performance and cost, and between performance and low power consumption design. This paper introduces the design of a 2.4GHz class D power amplifier which consists of two stage amplifiers. This power amplifier can transmit 15dBm output power to a 50Ω load. The power added efficiency was 50% and the total power consumption ...


Public Transport Accessibility Levels For Ahmedabad, India, Jay S. Shah, Bhargav Adhvaryu Sep 2016

Public Transport Accessibility Levels For Ahmedabad, India, Jay S. Shah, Bhargav Adhvaryu

Journal of Public Transportation

Public transport plays an important role in a city’s economy and its social equity. It is also instrumental in reducing automobile dependence and traffic congestion. Several factors must come together to achieve well-functioning public transport systems. One major factor is the level of accessibility offered by the public transport system. To better understand and consequentially enhance accessibility, we must be able to measure it and map it, which is the key aim of this paper.

The methodology in this study, which was originally developed by the London Borough of Hammersmith and Fulham and later adopted by Transport for London ...


Modeling Bus Dwell Time And Time Lost Serving Stop In China, Chao Wang, Zhirui Ye, Yuan Wang, Yueru Xu, Wei Wang Sep 2016

Modeling Bus Dwell Time And Time Lost Serving Stop In China, Chao Wang, Zhirui Ye, Yuan Wang, Yueru Xu, Wei Wang

Journal of Public Transportation

The primary objective of this study was to develop a quantitative approach to estimate bus dwell time and time lost serving stop, which included acceleration and deceleration time, dead time, and time for serving boarding and alighting passengers. A polynomial model incorporating kinematics of a particle was derived for estimating bus acceleration and deceleration time. In addition, descriptive statistics methods were used to analyze dead time. A case study was conducted to show the applicability of the proposed model with data collected from the seven most common types of bus stops in China. R-square and Mean Absolute Percentage Error (MAPE ...


Sustainable Software Development Through Overlapping Pair Rotation, Todd Sedano, Paul Ralph, Cécile Péraire Aug 2016

Sustainable Software Development Through Overlapping Pair Rotation, Todd Sedano, Paul Ralph, Cécile Péraire

Cécile Péraire


Context: Conventional wisdom says that team disruptions (like team churn) should be avoided. However, we have observed software development projects that succeed despite high disruption.
Objective: The purpose of this paper is to understand how to develop software effectively, even in the face of team disruption.
Method: We followed Constructivist Grounded Theory. We conducted participant-observation of several projects at Pivotal (a software development company), and interviewed 21 software engineers, interaction designers, and product managers. The researchers iteratively sampled and analyzed the collected data until achieving theoretical saturation.
Results: This paper introduces a descriptive theory of Sustainable Software Development. The theory ...


Experimental Study On Local Bond Stress-Slip Relationship In Self-Compacting Concrete, Marian Sabau, Ioan Pop, Traian Onet Aug 2016

Experimental Study On Local Bond Stress-Slip Relationship In Self-Compacting Concrete, Marian Sabau, Ioan Pop, Traian Onet

Marian Sabau

This paper summarizes the results of an experimental study on local bond stress-slip relationship of deformed reinforcing bars embedded in self-compacting concrete, considering the effect of concrete confinement by transverse reinforcement. In this study were cast 104 specimens by using self-compacting concrete and vibrated concrete. Pull-out tests were performed on deformed bars with short anchorage length (ld ≤ 5∅). The parameters analyzed were the concrete type, the confining reinforcement, the bar diameter and the anchorage length of bar. The results of this study showed that the ultimate bond strength was higher for self-compacting concrete compared to vibrated concrete, and the slip ...


Prospective Doctoral Statement For The University Of Southern California's School Of Cinematic Arts Media Arts + Practice Program, Gabriel Leiner Aug 2016

Prospective Doctoral Statement For The University Of Southern California's School Of Cinematic Arts Media Arts + Practice Program, Gabriel Leiner

Gabriel Leiner

After visiting L.A. again and seeing the beautiful fountains on the University of Southern California's campus I am filled with all kinds of ideas about the future and brimming with energy. To all those at the University of Southern California's Cinematic Arts Department, thanks for reading my ideas over the past couple years and helping me to evolve and become a better person and a better writer. Starting a position as a doctoral student in the Media Arts + Practice Program in 2016 is an exciting opportunity. I've got a really positive outlook about Kiss The Water.


Mapping Potential Foodsheds In Iowa: A System Optimization Modeling Approach, Guiping Hu, Randy Boeckenstedt, Lizhi Wang, Susan W. Arendt Aug 2016

Mapping Potential Foodsheds In Iowa: A System Optimization Modeling Approach, Guiping Hu, Randy Boeckenstedt, Lizhi Wang, Susan W. Arendt

Susan W. Arendt

Linear programming tools are used to gauge regional potential for local diversified agriculture required to meet the dietary needs of the population.


Silver Photo-Diffusion And Photo-Induced Macroscopic Surface Deformation Of Ge33s67/Ag/Si Substrate, M. Ailavajhala, M. Mitkova Aug 2016

Silver Photo-Diffusion And Photo-Induced Macroscopic Surface Deformation Of Ge33s67/Ag/Si Substrate, M. Ailavajhala, M. Mitkova

Maria I. Mitkova

Ge-chalcogenide films show various photo-induced changes, and silver photo-diffusion is one of them which attracts lots of interest. In this paper, we report how silver and Ge-chalcogenide layers in Ge33S67/Ag/Si substrate stacks change under light exposure in the depth by measuring time-resolved neutron reflectivity. It was found from the measurement that Ag ions diffuse all over the matrix Ge33S67layer once Ag dissolves into the layer. We also found that the surface was macroscopically deformed by the extended light exposure. Its structural origin was investigated by a scanning electron microscopy.