Irrigation system

A gravity irrigation system includes a distribution piping having apertures to distribute water to a field, and a valve located upstream of the distribution piping. The valve limits a pressure of the water being delivered to the distribution piping. The system also includes a sump to receive the water at a lowest elevation of the field, a depth sensor disposed within the sump, and a return pump disposed at least partially within the sump to move the water to an elevated portion of the field. The system also includes a motor to drive the return pump, and a power source coupled to a variable frequency drive that powers the motor and controls a motor speed proportionately to an indication of the depth sensor. The system also includes a transfer piping to bring the water from the return pump to a check valve and to the distribution piping

Information Sharing: Hackers vs Law Enforcement

The fields of information assurance and digital forensics continue to grow in both importance and complexity, spurred on by rapid advancement in digital crime. Contemporary law enforcement professionals facing such issues quickly discover that they cannot be successful while operating in a vacuum and turn to colleagues for assistance. However, there is a clear need for greater IT-based knowledge sharing capabilities amongst law enforcement organizations; an environment historically typified by a silo mentality. A number of efforts have attempted to provide such capabilities, only to be met with limited enthusiasm and difficulties in sustaining continued use. Conversely, the hacker community achieves rapid advancement due to its diligent emphasis on knowledge sharing through technology. The characteristics of knowledge sharing willingness and effectiveness within these two communities create a distinct advantage for hackers. In what follows, these two highly disparate communities are juxtaposed in terms of what drives their relative effectiveness in knowledge sharing efforts. The resulting conclusions lay a foundation for deeper empirical investigation into this phenomenon, which in turn may drive design decisions for emerging law enforcement knowledge sharing platforms such as the U.S.National Repository for Digital Forensics Intelligence

Effects of various fat sources on growth performance of finishing pigs

One hundred and twenty-eight finishing pigs averaging 124 lb were utilized to evaluate the effects of different fat sources on growth performance. Pigs were fed one of four diets containing either no added fat (control) or 4% added fat from soybean oil, coconut oil, or choice white grease. The control diet was formulated to contain 14.5 % crude protein and .66 % lysine. All fat-added diets were formulated with the same calorie:lysine ratio as the control diet. There were no differences in average daily gain between pigs fed either the control diet or diets containing added fat. Daily feed intake was reduced for pigs fed added fat from 4 to 7% compared to pigs fed no added fat, with pigs fed choice white grease having the lowest feed intake. This resulted in pigs fed choice white grease having 11% better feed efficiency compared to pigs fed no added fat. Pigs fed soybean oil exhibited a 4% improvement in feed efficiency, and those fed coconut oil were intermediate, with an 8% improvement in feed efficiency. These results indicate that 4% added fat reduces feed intake and improves feed efficiency of finishing pigs. In addition, it appears that choice white grease may be a superior fat source in finishing pig diets.; Swine Day, Manhattan, KS, November 16, 198

Economic Outlook for Lakeshore Advantage: Getting to 2030

Lakeshore Advantage, a nonprofit economic development organization serving businesses in Allegan and Ottawa counties, teamed up with the W.E. Upjohn Institute for Employment Research to better understand the long-term economic health of its region. The Upjohn Institute conducted an analysis of Allegan and Ottawa counties to hone in on the strengths of these communities and offer insights on where improvements are needed to grow the region and achieve Lakeshore Advantage’s 2030 goals which include ranking at or above selected comparative communities for median household income, average annual pay, total employment growth, and educational attainment. This study includes an examination of the region’s population, income, employment, mobility, and migration and examines how these factors interconnect in achieving Lakeshore Advantage’s 2030 goals. A literature review of features common to successful communities additionally reveals a needed special focus on industry diversification and specialization, educational attainment, and broadband services. The report also reveals several conclusions and key takeaways concerning the Lakeshore Advantage Region. Key aspects from each section of the report are noted here in the Executive Summary, as well as recommendations

Breaking Barriers to Low-Cost Modular Inverter Production & Use

The goal of this cost share contract is to advance key technologies to reduce size, weight and cost while enhancing performance and reliability of Modular Inverter Product for Distributed Energy Resources (DER). Efforts address technology development to meet technical needs of DER market protection, isolation, reliability, and quality. Program activities build on SatCon Technology Corporation inverter experience (e.g., AIPM, Starsine, PowerGate) for Photovoltaic, Fuel Cell, Energy Storage applications. Efforts focused four technical areas, Capacitors, Cooling, Voltage Sensing and Control of Parallel Inverters. Capacitor efforts developed a hybrid capacitor approach for conditioning SatCon's AIPM unit supply voltages by incorporating several types and sizes to store energy and filter at high, medium and low frequencies while minimizing parasitics (ESR and ESL). Cooling efforts converted the liquid cooled AIPM module to an air-cooled unit using augmented fin, impingement flow cooling. Voltage sensing efforts successfully modified the existing AIPM sensor board to allow several, application dependent configurations and enabling voltage sensor galvanic isolation. Parallel inverter control efforts realized a reliable technique to control individual inverters, connected in a parallel configuration, without a communication link. Individual inverter currents, AC and DC, were balanced in the paralleled modules by introducing a delay to the individual PWM gate pulses. The load current sharing is robust and independent of load types (i.e., linear and nonlinear, resistive and/or inductive). It is a simple yet powerful method for paralleling both individual devices dramatically improves reliability and fault tolerance of parallel inverter power systems. A patent application has been made based on this control technology

Exile Vol. XI No. 2

FICTION Don\u27t Break Bread with Strangers by Thomas Getz 5-12 Story by Kathy Swiger 17-20 The Last of the Flag Pole Sitters 25-29 POETRY Muttering: A Letter by Gretchen Schenk 14-15 Poem by Jane Pearson 20 Marina in March by Karen Combs 21 of the pope too slow in recovery by Bill C. West Jr. 22 Poem by Jim Nichols 23 Poem by Judy Strange 23 Haiku by Bonnie Bishop 29 ART Pen and Ink by Dan Thaxton 4 Linocut by Richard Machlan 13 Etching by Lynne Wiley 16 Woodcut by Lela Giles 22 Charcoal by Carol Kubie 2

Understanding the limit concept: Beginning with a coordinated process scheme.

Many authors have provided evidence for what appears to be common knowledge among mathematics teachers: The limit concept presents major difficulties for most students and they have very little success in understanding this important mathematical idea. We believe that a program of research into how people learn such a topic can point to pedagogical strategies that can help improve this situation. This paper is an attempt to contribute to such a program. Specifically, our goal in this report is to apply our theoretical perspective, our own mathematical knowledge, and our analyses of observations of students studying limits to do two things. First, we will reinterpret some points in the literature and second, we will move forward on developing a description, or genetic decomposition, of how the limit concept can be learned. In discussing the literature, we will suggest a new variation of a dichotomy, considered by various authors, between dynamic or process conceptions of limits and static or formal conceptions. We will also propose some explanations of why these conceptions are so difficult for students to construct. In describing the evolution of a genetic decomposition for the limit concept, we will give examples of how we used our analysis of interviews of 25 students from a calculus course to make appropriate modifications. Outline of article This paper is organized in five sections. We begin with very brief descriptions of our research paradigm and our theoretical perspective which we refer to as the APOS theory. The next two sections are the heart of the paper. They consist of a consideration of some points from the literature and a description of the evolution of a genetic decomposition of the limit concept. Finally we offer some pedagogical suggestions for instruction that could relate to how the limit concept can be learned. A research paradigm Our overall paradigm for doing this kind of research has been described in detail in Dubinsky (1992a), so we need only sketch it here (se

The divergent DSL ligand Dll3 does not activate Notch signaling but cell autonomously attenuates signaling induced by other DSL ligands

Mutations in the DSL (Delta, Serrate, Lag2) Notch (N) ligand Delta-like (Dll) 3 cause skeletal abnormalities in spondylocostal dysostosis, which is consistent with a critical role for N signaling during somitogenesis. Understanding how Dll3 functions is complicated by reports that DSL ligands both activate and inhibit N signaling. In contrast to other DSL ligands, we show that Dll3 does not activate N signaling in multiple assays. Consistent with these findings, Dll3 does not bind to cells expressing any of the four N receptors, and N1 does not bind Dll3-expressing cells. However, in a cell-autonomous manner, Dll3 suppressed N signaling, as was found for other DSL ligands. Therefore, Dll3 functions not as an activator as previously reported but rather as a dedicated inhibitor of N signaling. As an N antagonist, Dll3 promoted Xenopus laevis neurogenesis and inhibited glial differentiation of mouse neural progenitors. Finally, together with the modulator lunatic fringe, Dll3 altered N signaling levels that were induced by other DSL ligands

Effects of daily porcine somatotropin administration on tile performance and carcass characteristics of finishing swine

One hundred forty-four pigs (72 barrows and 72 gilts) were utilized in six treatments with six pens each to evaluate four levels of daily porcine somatotropin (pST) injections (0, 1, 3, or 5 mg/d) in combination with diets containing 13 or 16% crude protein (CP). One randomly selected pig from each pen was slaughtered when it reached a weight between 230 and 240 lb. Daily feed intake (ADFI), tenth rib backfat, and estimated percentage of lean pork were reduced in pigs fed the 13% CP diet and injected with 3 mg/d pST compared to pigs fed the same diet and injected daily with a placebo. Feed intake was reduced in pigs fed the 16% CP diet and injected daily with 3 and 5 mg/d pST. Improvement in feed conversion (F/G), tenth rib backfat, and estimated percentage lean pork occurred when pigs fed the 16% CP diet were injected with 1 mg/d, with greater improvements occurring at the 3 and 5 mg/d levels of pST. The improvement in F/G and the greater magnitude of response observed in pigs fed 16% CP diets compared to the response of pigs fed the 13% CP diet indicate that both the performance and carcass characteristics of pigs injected with pST are dependent on the dietary CP content.; Swine Day, Manhattan, KS, November 16, 198