Inventory control in a multi-warehouse system

Imperial Users onl

Repeatability Analysis of 304L Deposition by the LENS® Process

Sandia National Laboratories is currently engaging in an effort to qualify Laser Engineered Net Shaping™ (LENS®) as a repair and modification process for high rigor metal components. As part of that effort, the LENS team has conducted a process repeatability test to help identify variation within the system. This test utilized 304L stainless steel which is a commonly used material at Sandia. Over the course of 12 weeks, 3/8”x3/8”x2” towers were built in sets of 3 with a total of 30 towers completed. A random sampling of 10 of these towers (1 from each set of 3) had been identified before depositing the towers, and these towers were used for tensile testing and metallographic testing. The testing showed the ultimate and yield strengths of all samples to be well above those of annealed 304L. This is expected because of the rapid melt pool solidification present in the LENS process and the resulting grain refinement. The ductility, which usually remains on par with annealed 304L, was found to be lower. The final cause of this loss of ductility was determined to be inter-layer separation due to loose wires in the closed loop melt pool control system.Englis

Targeted Advertising and Voter Turnout: An Experimental Study of the 2000 Presidential Election

Scholars disagree whether negative advertising demobilizes or stimulates the electorate. We use an experiment with over 10,200 eligible voters to evaluate the two leading hypotheses of negative political advertising. We extend the analysis to examine whether advertising differentially impacts the turnout of voter subpopulations depending on the advertisement痴 message. In the short term, we find no evidence that exposure to negative advertisements decreases turnout and little that suggests it increases turnout. Any effect appears to depend upon the message of the advertisement and the characteristics of the viewer. In the long term, we find little evidence that the information contained in the treatment groups・advertisements is sufficient to systematically alter turnout.

Mitigating disaster: mapping cognitive processes in applying technology to crises

Extreme events are sometimes defined as unexpected events in which local resources are insufficient to cope with the extent of the damage and require outside resources to address the hazards specific to the event. For that reason, communities immediately adjacent to disaster areas have a unique and important role in the study of measures to mitigate the effects of the resulting hazards to human life and property. This exploratory study looks at the use of information technology in conjunction with disaster mitigation activities in areas adjacent to a large disaster. The experiences, thoughts, and beliefs of individuals involved in mitigation activities at Louisiana State University immediately following Hurricane Katrina and the resulting large scale evacuation of New Orleans were captured through interviews in which cognitive maps were developed. Through a Grounded Theory approach, the data was analyzed for theoretical fit. In the early analysis the data grouped itself into three main stories; the Implementers, Decision Makers, and the Vendor stories. The best theoretical fit was found in elements of Improvisation Theory. Specifically, alignment was found in the use of Bricolage in solving problems, the unique elements that resulted in a climate of openness to improvisational processes, and the improvisation of command and control. Finally, other research questions that came up in the course of the study are examined

A Follow-Up Study Of Drop-Cuts In The Agriculture Department Garrison High School, Garrison, Texas From 1947-1957

Within the last two decades, numerous schools have made follow-up studies of their graduates and drop—outs. These studies have ranged from reviews of a particular phase of a school program covering a short period of time to complex studies extending over a period of years. Such studies have been made by individuals, by departments of schools, and by entire faculties. Although the problem considered and the methods used in various studies may be identical, the facts found in one school did not and could not apply wholly to another school. For such a study of this sort to be of maximum value to a school, it should be made by an individual or a group familiar with and interested in the local district and the findings should be available to the administration and faculty of the school. Statement of the Problem It is the purpose of this study to investigate and analyse (l) the incidence of drop-outs in Garrison High School, Garrison, Texas, (2) the causes of early school leaving that exist in the school, and (3) to determine the measures that might be taken to reduce the incidence of drop-outs in Garrison High School

Modern Digital Seismology: Instrumentation, and Small Amplitude Studies in the Engineering World

The recording of ground motions is a fundamental part of both seismology and earthquake engineering. The current state-of-the-art 24-bit continuously recording seismic station is described, with particular attention to the frequency range and dynamic range of the seismic sensors typically installed. An alternative method of recording the strong-motions would be to deploy a velocity sensor rather than an accelerometer. This instrument has the required ability to measure the strongest earth motions, with enhanced long period sensitivity. An existing strong motion velocity sensor from Japan was tested for potential use in US seismic networks. It was found to be incapable of recording strong motions typically observed in the near field of even moderate earthquakes. The instrument was widely deployed near the M8.3 Sept 2003 Tokachi-Oki earthquake. The dataset corroborated our laboratory observations of low velocity saturations. The dataset also served to show all inertial sensors are equally sensitive to tilting, which is widespread in large earthquakes. High-rate GPS data is also recorded during the event. Co-locating high-rate GPS with strong motion sensors is suggested to be currently the optimal method by which the complete and unambiguous deformation field at a station can be recorded. A new application of the modern seismic station is to locate them inside structures. A test station on the 9th floor of Millikan Library is analysed. The continuous data-stream facilitates analysis of the building response to ambient weather, forced vibration tests, and small earthquakes that have occurred during its lifetime. The structure's natural frequencies are shown to be sensitive not only to earthquake excitation, but rainfall, temperature and wind. This has important implications on structural health monitoring, which assumes the natural frequencies of a structure do not vary significantly unless there is structural damage. Moderate to small earthquakes are now regularly recorded by dense, high dynamic range networks. This enhanced recording of the earthquake and its aftershock sequences makes possible the development of a Green's Function deconvolution approach for determining rupture parameters

A Stand Level Growth and Yield Model for Red Oak/Sweetgum Forests in Southern Bottomlands

A greater emphasis is being placed on hardwood management, yet there has been relatively little effort to develop growth and yield information for hardwood forest types. Measurements on permanent growth and yield plots collected in 1981, 1988, 1994, and 2006 in minor stream bottoms in Mississippi and Alabama were used to construct a stand level growth and yield model for red oak/sweetgum stands. The model predicts arithmetic mean diameter, quadratic mean diameter, trees per acre, basal area, total tree height, and cubic foot volume per acre for the total stand and by species. Different sets of equations were constructed depending on the amount of information known about a hardwood stand. Models were chosen based on significance of variables, coefficient of determination, index of fit, and biological trends. Predicted stand development patterns are discussed. These models will be base models for a complete diameter distribution growth and yield model

Pedagogical effects of service-learning in a human exceptionality course: A comparison of two approaches

Service-learning. as a pedagogical approach for increasing social responsibility in students. has increasingly gained acceptance in higher education. With its emphasis on reflection and reciprocity. service-learning combines content-area learning with authentic community-based experiences in order to enhance understanding of the course content and to promote civic responsibility. Although several studies have investigated the effects of service-learning at the college level, few studies have specifically focused on the use of service-learning in special education. The purpose of this study was to examine the service-learning component of an undergraduate human exceptionality course. One section of the course utilized an unlimited choice (UC) approach. in which participants were instructed to design and implement a service-learning project on their own. The second course section utilized a limited choice (LC) approach in which participants chose among three service options that had been prearranged by the instructors. A comparative case study design was used in which multiple sources of data were analyzed in order to (a) develop an understanding of the service-learning experiences of participants engaged in the UC and LC projects, (b) identify similarities and/or differences in the service-learning experiences between sections, (c) identify differences in participants\u27 perceptions of the benefits of the service-learning experience, and (d) determine if any pedagogical advantages or disadvantages resulted from the use of either approach in the domains of course content and citizenship, or in the affective, behavioral, and cognitive dimensions of learning. The findings suggest that most participants in each section engaged in quality service-learning projects. The data also suggest that the service experience did contribute to their understanding of the course content and citizenship roles, and had some influence on the affective, behavioral, and cognitive dimensions of learning. Although similarities in experiences were identified, several differences were also identified between sections and within sections that may have affected participants\u27 perceptions of the benefits of the experience. Overall, participants in the UC section perceived a greater benefit of the service experience than did participants from the LC section. Based on the findings of this study, recommendations for future practice were developed

Results of Millikan Library Forced Vibration Testing

This report documents an investigation into the dynamic properties of Millikan Library under forced excitation. On July 10, 2002, we performed frequency sweeps from 1 Hz to 9.7 Hz in both the East-West (E-W) and North-South (N-S) directions using a roof level vibration generator. Natural frequencies were identified at 1.14 Hz (E-W fundamental mode), 1.67 Hz (N-S fundamental mode), 2.38 Hz (Torsional fundamental mode), 4.93 Hz (1st E-Wovertone), 6.57 Hz (1st Torsional overtone), 7.22 Hz (1st N-S overtone), and at 7.83 Hz (2nd E-Wovertone). The damping was estimated at 2.28% for the fundamental E-W mode and 2.39% for the N-S fundamental mode. On August 28, 2002, a modal analysis of each natural frequency was performed using the dense instrumentation network located in the building. For both the E-W and N-S fundamental modes, we observe a nearly linear increase in displacement with height, except at the ground floor which appears to act as a hinge. We observed little basement movement for the E-W mode, while in the N-S mode 30% of the roof displacement was due to basement rocking and translation. Both the E-W and N-S fundamental modes are best modeled by the first mode of a theoretical bending beam. The higher modes are more complex and not well represented by a simple structural system