Digital Commons Network^™

Effect Of Machining Feed On Surface Roughness In Cutting 6061 Aluminum, Mathew Kuttolamadom, Sina Hamzehlouia, Laine Mears

Publications

The general manufacturing objective during the fabrication of automotive components, particularly through machining, can be stated as the striving to achieve predefined product quality characteristics within equipment, cost and time constraints. The current state of the economy and the consequent market pressure has forced vehicle manufacturers to simultaneously reduce operating expenses along with further improving product quality. This paper examines the achievability of surface roughness specifications within efforts to reduce automotive component manufacture cycle time, particularly by changing cutting feeds. First, the background and attractiveness of aluminum as a lightweight automotive material is discussed. Following this, the methodologies employed for …

Water Law In The Western United States, Susan Kelly

Publications

No abstract provided.

Stability Of Fully Nonlinear Stokes Waves On Deep Water: Part 1. Perturbation Theory, Shahrdad Sajjadi, David L. Ross

Publications

We consider a full set of harmonics for the Stokes wave in deep water in the absence of viscosity, and examine the role that higher harmonics play in modifying the classical Benjamin-Feir instability. Using a representation of the wave coefficients due to Wilton, a perturbation analysis shows that the Stokes wave may become unbounded due to interactions between the N^th harmonic of the primary wave train and a set of harmonics of a disturbance. If the frequency of the n^th harmonic is denoted Ꙍ_n = Ꙍ(1 ± ꭉ) then instability will occur if

√2 k n^{n …}

New Mexico Environmental Flows Workshop Report And Synthesis, From The Environmental Flows Workshop At The University Of New Mexico School Of Law March 15, 2010, Utton Transboundary Resources Center, Unm, Adrian Oglesby

Publications

This report is a synthesis of the presentations and discussions featured at the Utton Transboundary Re-sources Center’s March 15, 2010 Environmental Flows Workshop at the University of New Mexico School of Law. Over 100 stakeholders, lawyers, scientists, and decision-makers gathered to develop a better understanding of how environmental flows are successfully implemented across the West and in New Mexico. They also began the process of evaluating the condition of New Mexico’s rivers and identifying opportunities to conserve and enhance their natural functions.

The goal of the Workshop was to inform a wide range of policy-makers, agency managers and stakeholders of …

Defining The Genus Hydropsyche (Trichoptera:Hydropsychidae) Based On Dna And Morphological Evidence, Christy Jo Geraci, Xin Zhou, John C. Morse, Karl M. Kjer

Publications

In this paper, we review the history of Hydropsychinae genus-level classification and nomenclature and present new molecular evidence from mitochondrial cytochrome c oxidase subunit I (COI) and nuclear large subunit ribosomal ribonucleic acid (28S) markers supporting the monophyly of the genus Hydropsyche. Both molecular and morphological characters support a broad conservative definition of Hydropsyche. Caledopsyche, Hydatomanicus, and Occutanspsyche are synonymized with Hydropsyche. The following species groups are established: Hydropsyche bronta Group (generally corresponding with Ceratopsyche and Hydropsyche morosa and newae Groups), Hydropsyche colonica Group (generally corresponding with Orthopsyche), Hydropsyche instabilis Group (generally corresponding with Hydropsyche s.s.), and Hydropsyche naumanni Group …

Sucrose, Water And Nutrient Use During State Ii Multiplication Of Two Turmeric Clones (Curcuma Longa L.) In Liquid Medium, Jeffrey Adelberg

Publications

Two clones of turmeric (Cucruma longa L.) were assessed nine times during a 28-day culture period in double phosphate MS liquid medium containing 2%, 4% and 6% sucrose. The phase of rapid shoot bud multiplication lasted for 21 days or less, in both clones in all media. The maximum multiplication rate was 3.4× at 20 and 19 days, with 3.9% or 4.7% initial sucrose concentration being optimal for the clones 9-3 and 35-1, respectively. Dry mass increased over the entire culture period and was greatest with 4.8% or at least 6% initial sucrose concentration for the two clones, 9-3 …

Developing A Theoretical Framework For Water Quality Trading In The Saluda-Reedy Watershed, South Carolina, 2010 March 1, Jeff Parkey, Stephen Julka, Robert T. Carey

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No abstract provided.

The E-Flow Challenge In An Acequia Irrigation System With Storage - Environmental Flow Workshop, Harold Trujillo

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No abstract provided.

Some Municipal Programs To Develop And/Or Sustain Living Rivers In New Mexico, Claudia Borchert

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No abstract provided.

Colorado's Instream Flow Program: History And Current Activities, The Colorado Water Conservation Board

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No abstract provided.

Environmental Flows In Elephant Butte Irrigation District, Gary Esslinger

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No abstract provided.

Geomorphic Condition And Shallow Aquifers, Shann Stringer

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No abstract provided.

The Challenge Of Climate Change In The Classroom, Richard Snow, Mary Snow

Publications

A comprehensive approach to climate change education is necessary to address numerous environmental issues. Such an all-encompassing ecological pedagogy is multifaceted providing an overview of the science behind major global environmental issues within the context of the physical environment of Earth including global climate change, resource extraction, water and air quality, urbanization, geohazards, and pollution. The main goal of the curricula is to engage students in rigorous analyses of data that can be compared with global trends. This research discusses the development of an upper-level college course on Climate Change created as part of an interdisciplinary Honors Seminar Series. The …

On Simulating Univariate And Multivariate Burr Type Iii And Type Xii Distributions, Todd C. Headrick, Mohan Dev Pant, Yanyan Sheng

Publications

This paper describes a method for simulating univariate and multivariate Burr Type III and Type XII distributions with specied correlation matrices. The methodology is based on the derivation of the parametric forms of a pdf and cdf for this family of distributions. The paper shows how shape parameters can be computed for specied values of skew and kurtosis. It is also demonstrated how to compute percentage points and other measures of central tendency such as the mode, median, and trimmed mean. Examples are provided to demonstrate how this Burr family can be used in the context of distribution fitting using …

Epidermal Langerhans Cells Rapidly Capture And Present Antigens From C-Type Lectin-Targeting Antibodies Deposited In The Dermis, Vincent Flacher, Christoph H. Trip, Patrizia Stoitzner

Publications

Antigen-presenting cells can capture antigens that are deposited in the skin, including vaccines given subcutaneously. These include different dendritic cells (DCs) such as epidermal Langerhans cells (LCs), dermal DCs, and dermal langerin DCs. To evaluate access of dermal antigens to skin DCs, we used mAb to two C-type lectin endocytic receptors, DEC-205/CD205 and langerin/CD207. When applied to murine and human skin explant cultures, these mAbs were efficiently taken up by epidermal LCs. In addition, anti-DEC-205 targeted langerin CD103 and langerin CD103 mouse dermal DCs. Unexpectedly, intradermal injection of either mAb, but not isotype control, resulted in strong and rapid labeling …

Conservation Blueprint, A Guidebook For Protecting Place And Prosperity In Arrowsic, Bath, Bowdoin, Bowdoinham, Brunswick, Georgetown, Harpswell, Phippsburg, Richmond, Topsham, West Bath And Woolwich, Sagadahoc Region Rural Resources Initiative, Steve Walker

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No abstract provided.

People And Nature Adapting To A Changing Climate, Charting Maine's Course, Maine Department Of Environmental Protection

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No abstract provided.

Fisheries & Aquatic Habitat Restoration Feasibility Study, Royal River Restoration Project Yarmouth, Maine, Stantec Consulting Services, Inc.

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No abstract provided.

Gulf Of Maine Council On The Marine Environment Action Plan 2012-2017, Gulf Of Maine Council On The Marine Environment

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No abstract provided.

Presumpscot Watershed Initiative, Implementing Water Quality Improvements To Support Vital Fisheries, Final Report, Matthew Craig, Presumpscot River Watershed Coalition

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No abstract provided.

Assigning Storage Locations In An Automated Warehouse, Mark H. Mcelreath, Maria E. Mayorga, Laine Mears

Publications

A common rule for retrieval from Automated Storage and Retrieval Systems (AS/RS) is to follow a first-in-first-out (FIFO) discipline. In many cases FIFO priority is set by date of manufacture. In some cases, however, the material may be stored in the warehouse according to a FIFO priority which depends on something other than the date of manufacture of that material, such as rules based on shipping container number or date of entry to warehouse. In this case, there needs to be a systematic approach to assigning a range of FIFO priority. A simulation model is developed to test the impact …

Design Assessment: Consumer Reports Style, Todd R. Kelley

Publications

The article analyzes a design assessment-based activity, in which students are asked to evaluate an existing technology through a Consumer Reports-style approach. According to H. Petroski, the exposure of students to several design examples is important to start learning the basic elements needed in the design process. It claims that the activity will enable students to sharpen their knowledge in several areas including identifying design constraints and criteria, training via study of open designs, and practicing engineering design methods for optimization. It suggests that these are important skills for creating the student's capacity to undertake bigger design activities.

Engineering Professional Development Design For Secondary School Teachers: A Multiple Case Study, Jenny L. Daugherty

Publications

The effectiveness of teachers has been regarded as crucial to the success of standards-based reform (Fishman, Marx, Best, & Tal, 2003). Research, particularly within science and mathematics, has underscored the need for professional development to help teachers understand (a) subject matter, (b) learners and learning, and (c) teaching methods (Loucks-Horsley, 1999). In addition to focusing on teacher professional development, national reform efforts have also emphasized science, technology, engineering, and mathematics (STEM) education (i.e., Rising Above the Gathering Storm, NRC, 2006). While substantial work has been conducted in mathematics and science, the efforts in technology and engineering education are much less …

Two Novel Approaches Used To Produce Biodiesel From Low-Cost Feedstocks, Xiaohu Fan, Xi Wang, Feng Chen

Publications

The price of feedstock is one of the most significant factors affecting the economic viability of biodiesel manufacturer. Many approaches were investigated to reduce the biodiesel production cost. The present work gave a preliminary study of two approaches to economically produce biodiesel from waste cooking oil (WCO) and flaked cottonseed. One was the use of ultrasound-assisted synthesis of biodiesel from WCO. The other was the application of in situ transesterification from flaked cottonseed. Gas chromatography (GC) and High performance liquid chromatography (HPLC) results demonstrated the feasibility of using both approaches to produce biodiesel from low-cost feedstock.

Empirical Modeling Of The Stress-Strain Relationship For An Upsetting Process Under Direct Electrical Current, Joshua Jones, Laine Mears, J. T. Roth

Publications

Present research involving Electrically-Assisted Manufacturing (EAM) has shown the advantageous effects that an applied current flux provides on the mechanical properties with respect to part formation. Overall general results using this process include the reduction of the flow stress during forming, increased achievable deformation, and a decrease or elimination of springback. Specifically targeting the compression process, this paper evaluates the stress-strain relationship and develops from experimental results an initial stress predictor function that includes the effect of electrical current. Once developed, the derived empirical model is shown capable of estimating the flow stress for an EAM upsetting test at various …

High Performance Computing Instrumentation And Research Productivity In U.S. Universities, Amy W. Apon, Linh B. Ngo, Stanley Ahalt, Vijay Dantuluri, Constantin Gurdgiev, Moez Limayem, Michael Stealey

Publications

This paper studies the relationship between investments in High-Performance Computing (HPC) instrumentation and research competitiveness. Measures of institutional HPC investment are computed from data that is readily available from the Top 500 list, a list that has been published twice a year since 1993 that lists the fastest 500 computers in the world at that time. Institutions that are studied include US doctoral-granting institutions that fall into the very high or high research rankings according to the Carnegie Foundation classifications and additional institutions that have had entries in the Top 500 list. Research competitiveness is derived from federal funding data, …

Investigation Of The Machining Of Titanium Components For Lightweight Vehicles, Laine Mears, Mathew A. Kuttolamadom, Joshua J. Jones, Thomas R. Kurfess, Aditya S. Choragudi

Publications

Due to titanium’s excellent strength-to-weight ratio and high corrosion resistance, titanium and its alloys have great potential to reduce energy usage in vehicles through a reduction in vehicle mass. The mass of a road vehicle is directly related to its energy consumption through inertial requirements and tire rolling resistance losses. However, when considering the manufacture of titanium automotive components, the machinability is poor, thus increasing processing cost through a trade-off between extended cycle time (labor cost) or increased tool wear (tooling cost). This fact has classified titanium as a “difficult-to-machine” material and consequently, titanium has been traditionally used for application …

Optimization, An Important Stage Of Engineering Design, Todd R. Kelley

Publications

The presents information on optimization, an important stage of engineering design. Criteria and design constraints are used in the optimization stage of the engineering design process to allow the designer to locate the optimal solution. Before initiating a prototype work, both analysis and optimization are done in designing a product. Optimization is done to create the best design relative to a set of prioritized criteria or constraints, including maximizing factors such as productivity, strength, reliability, longevity, efficiency and utilization.

Stem Education And Leadership: A Mathematics And Science Partnership Approach, Chris Merrill, Jenny Daugherty

Publications

The issue of attracting more young people to choose careers in science, technology, engineering, and mathematics (STEM) has become critical for the United States. Recent studies by businesses, associations, and education have all agreed that the United States’ performance in the STEM disciplines have placed our nation in grave risk of relinquishing its competitive edge in the marketplace (e.g., Rising above the gathering storm, 2007). A Congressional Research Service (2006) report stated that, a “large majority of secondary students fail to reach proficiency in math and science, and many are taught by teachers lacking adequate subject matter knowledge” (Congressional Research …

Engineering Student Outcomes For Infusion Into Technological Literacy Programs: Grades 9-12, Craig Rhodes, Vincent Childress

Publications

In 2004, the National Center for Engineering and Technology Education (NCETE) secured funding from the National Science Foundation (NSF) to infuse engineering design into the schools through technology education. In order to reach this goal the researchers, in cooperation with NCETE, conducted a two phase study to identify outcomes for high-school students studying engineering. The first study (referred to as a Phase I) focused on students who intended to enter an engineering program after high school, answering the question:

What are the engineering student outcomes that prospective engineering students in grades 9 through 12 should know and be able to …