The Effect of Jetting Parameters on the Performance of Droplet Formation for Ink-Jet Rapid Prototyping

Heinzl et al. (1985) reports that experiments in ink-jets to produce drawings or signals occurred as early as 1930. Various companies such as IBM and Pitney-Bowes have conducted extensive studies on these devices for many years. Many such reports are available in such journals as the IBM Journal of Research and Development. While numerous articles have been published on the jetting characteristics of ink and water, the literature is rather limited on fluids such as waxes (Gao & Sonin 1994) or non-water based fluids (Passow, et al. 1993). This present study extends the knowledge base to determine the performance of molten waxes in "ink-jet" type printers for rapid prototyping. The purpose of this research was to qualitatively and quantitatively study the droplet formation of a drop-on-demand ink-jet type nozzle system for rapid prototyping

Computer Simulation of A New Method to Dry Lumber Using Solar Energy and Absorption Refrigeration

A mathematical model for a Solar-absorption dehumidification lumber dryer has been developed. Performance of a commercial size lumber kiln of 60 m3 (25,000 board-feet) was simulated for a southern Illinois climate for four different seasons of the year. The solar-absorption system dried yellow-poplar lumber as fast as a conventional vapor-compression dehumidification system while reducing the electrical energy costs by 85%. Capital costs and yearly fuel costs were compared to an oil-fired boiler system, a wood-fired boiler system, and a vapor-compression lumber-drying system

Los Gestores de Referencias Sociales: índices de popularidad y descubrimiento científico

Comunidades Virtuales 2.0 d la SEDIC[ES]Los gestores de última generación han permitido disponer de estas aplicaciones en el navegador web, lo cual obedece a una lógica, si el navegador web es la herramienta natural para el descubrimiento de la investigación científica, es natural que ésta sea la herramienta con la que recopilar los registros bibliográficos; de manera que el entorno web se va convirtiendo cada vez con más fuerza en un elemento recurrente para compartir y descubrir información científica.[EN] The next generation managers have allowed to have these applications on the web browser, which follows a logical, if the web browser is the natural tool for the discovery of scientific research, it is natural that this is the tool to collect bibliographic records, so that the web environment is becoming increasingly harder for a recurrent element share and discover scientific information

New genetic loci link adipose and insulin biology to body fat distribution.

Body fat distribution is a heritable trait and a well-established predictor of adverse metabolic outcomes, independent of overall adiposity. To increase our understanding of the genetic basis of body fat distribution and its molecular links to cardiometabolic traits, here we conduct genome-wide association meta-analyses of traits related to waist and hip circumferences in up to 224,459 individuals. We identify 49 loci (33 new) associated with waist-to-hip ratio adjusted for body mass index (BMI), and an additional 19 loci newly associated with related waist and hip circumference measures (P < 5 × 10(-8)). In total, 20 of the 49 waist-to-hip ratio adjusted for BMI loci show significant sexual dimorphism, 19 of which display a stronger effect in women. The identified loci were enriched for genes expressed in adipose tissue and for putative regulatory elements in adipocytes. Pathway analyses implicated adipogenesis, angiogenesis, transcriptional regulation and insulin resistance as processes affecting fat distribution, providing insight into potential pathophysiological mechanisms

Model Development and Economic Evaluation of a Sensible Heat Storage Unit Utilized in a Solar-Dehumidification Lumber Drying System

A mathematical model for a rock-bed energy storage system has been developed for a solar-dehumid-ification lumber dryer and shown to give good correlation with experimental data. The drying rate of yellow poplar lumber was mathematically related to the collector area and storage size. A simple economic model was used to compare solar, solar-dehumidification, dehumidification, and wood-fired boiler drying systems

Some helpful case study examples of teaching engineering ethics

Engineering case studies are used in an ethics course to force students to make real-life ethical choice. Video tapes and class presentation techniques are suggested that promote critical thinking and personal involvement. In the paper, some student data are presented which indicate that these methods are improving the students\u27 ethical standards and that substantial learning is taking place

CONDENSING WATER VAPOR - AIR FLOW IN A PARALLEL PLATE HEAT EXCHANGER.

Abstract not availabl

General Collector Sizing Method for Solar Kilns.

This paper uses readily available information to present a method to calculate the optimum size of a solar collector considering the following variables: wood species, wood thickness, drying rate, kiln location, kiln type, and solar collector type. This method can be used for any site location and wood species within the United States as long as the solar collector is tilted at an angle approximately equal to the latitude. Good correlation is shown between the sizing method and experimental solar-drying data for yellow-poplar lumber in southern Illinois