Status of the Instream Flow Issue in Arkansas, 1987

Expansion of Arkansas\u27 population with concurrent increases in the state\u27s domestic, industrial, and agricultural water uses and possible out-of-state diversion are placing substantial demands on the state\u27s water resources. In an attempt to address this growing concern, Act 1051 (1985) of the Arkansas legislature was passed requiring the determination of present and future state water needs. A specific area of this mandate was the quantification of instream flow requirements. Basic instream flow needs are maintenance of the aquatic ecosystem and dependent riparian environment. Flow reservation may compliment other instream uses such as recreation, navigation, water quality, and groundwater recharge. However, offstream uses (e.g. irrigation and industry) may compete for these same flows and often at the most critical time of year. In order to answer questions concerning instream flow requirements, over 40 methods of instream flow determination have been developed, the majority in the semi-arid western United States. These individual procedures may be classified into four major methodologies: (1) discharge, (2) single transect, (3)multiple transect, and (4) regression analysis of historical data. Requirements of these four types vary according to necessary level of expertise, time and effort expended, and monetary outlay. In one year, requests for fish and wildlife instream flow needs for approximately 60 stream reaches throughout Arkansas limited the possible options. Modification and further development of a well-known method is outlined as an initial step in the process of quantifying Arkansas\u27 instream flow needs. Examples are given for some of the major river basins throughout the state

Pharmacotherapy of Parkinson’s disease:Progress or regress?

Parkinson’s disease (PD) is a chronic, progressive disease of the central nervous system (CNS),characterized by a slow loss of dopaminergic neurons in the substantia nigra, leading to significantdecrease in dopamine (DA) levels in the striatum. Currently used drugs, such as levodopa(L-DOPA), amantadine, dopamine agonists (D) or anticholinergic drugs, are not effective enough,and do not eliminate the causes of disease. Many research centers are conducting researchon new forms of currently used drugs (e.g. Duodopa, XP21279, IPX066), new drugs of alreadyknown groups (e.g. safinamide), medicines that suppress side effects of L-DOPA (e.g. AFQ056,fipamezole), and, finally, compounds with a novel mechanism of action (e.g. PMY50028, A2Areceptor antagonists). A lot of scientific reports indicate an important role of A2A receptorsin the regulation of the central movement system, so a new group of compounds – selectiveantagonists of A2A receptors (e.g. istradefylline, preladenant, SYN115) – has been developed and their potential use in PD has been examined. Clinical studies of A2A receptor antagonistshave shown that this group of compounds can shorten off periods and at the same time theydo not worsen dyskinesias in patients with PD. Moreover, there is ongoing research on newforms of treatment, such as gene therapy. Attempts to apply the viral vector AAV-2, whichwill be able to infect neurons with a variety of genes, including the gene of glutamate decarboxylase(GAD), neurturin (NTN), or aromatic L-amino acid decarboxylase, are currently beingcarried out. The results of phase I and II clinical studies showed some efficacy of this form oftreatment, but the method requires further studies. An analysis of potential future therapiesof Parkinson’s disease suggests that some progress in this field has been made

Uso de galgas extensiométricas para obtener la fuerza de apriete entornillo autorroscante

Se describe cómo a través de la instrumentación de galgas extensiométricas en tornillos autorroscantes, se logra determinar la tensión generada en el tornillo al momento de aplicar en éste el par torsional. Esto se lleva acabo a través de pruebas de laboratorio, en las cuales se utilizaron tres tipos de acero en la placa en la que el tornillo autorroscante generó su cuerda, acero SAE 1018, SAE 1045 y SAE 1060.Al realizar cada prueba se obtiene la gráfica partorsional-ángulo y tensión-par torsional, las cuales muestran el comportamiento mecánico del ensamble en función de cada tipo de acero.Al desarrollar las pruebas y obtener las gráficas,es posible determinar ventajas y desventajas al utilizar galgas extensiométricas en tornillos autorroscantes, se obtiene la tensión en el tornillo y se determinan las variables del ensamble que más afectan la fuerza de tensiónen éste. Con todo esto se logra proveer la fuerza de apriete necesaria para el óptimo desempeño del ensamble, especialmente en uniones críticas

Relación entre la estructura en estado recocido del acero grado construcción y las propiedades mecánicas después de un tratamiento térmico final

En esta investigación se analizó la influencia de diferentes estructuras obtenidas en el proceso de recocido para la vida útil de los elementos finales (baleros). Se observó, con base en los resultados, que existe una estrecha relación entre las estructuras (tamaño de carburos) en estado recocido y las propiedades mecánicas de elementos finales después del temple y revenido

Medición de la fuerza de apriete en un ensamble, utilizando tornillo autorroscante

En este artículo se presenta una metodología para medir la tensión en un tornillo autorroscante, instrumentado con galgas extensiométricas. Así mismo, se describen las ventajas y desventajas que se pueden presentar al momento de realizar la prueba, basada en dicha metodología. Esta metodología ayudará a dar una mejor referencia del comportamiento de estos tornillos en una unión, así como el evitar diseños de mala calidad, propiciando un ahorro de tiempo y costo en la industria

The synthesis and properties of the phases obtained by solid-solid reactions

The presented work encompasses the subject of the studies and the results obtained over the last years by the research workers of the Department of Inorganic Chemistry. They include mainly the studies on the reactivity of metal oxides, searching for new phases in binary and ternary systems of metal oxides as well as describing phase relations establishing in such systems. They also encompass works on the extensive characteristics of physico-chemical properties of the newly obtained compounds

Shifting Transliteracies in Elementary School: Understanding How Transliteracy Practices Contribute to Grade-3 Students’ Construction of Meaning

Situated within social constructivist understandings of multiliteracies, this eight-month ethnographic case study explored transliteracy practices in a Grade-3 classroom. The intention of this research was to learn how digital and multiliteracies support the ways in which children in elementary school construct meaning through transliteracy practices. Findings revealed that transliteracy, using both digital and analog technologies across modes, media, genres and platforms, is an effective lens to understand the shifting literacy practices of young 21st century learners. Transliteracy is described in relation to four literacy concepts: critical transliteracy, digital transliteracy, social transliteracy and disciplinary transliteracy. Understandings and implications of a transliteracy mindset are articulated in scholarship and pedagogy and by descriptive examples of transliteracy in the classroom. This study contributes to the growing conceptual understanding of transliteracy that supports the fluid nature of transliterate learning. It promotes the use of multiliteracies, student choice and opportunities to use more than one mode, device or platform simultaneously at school. Canadian students constantly face many choices in literacies; thus, being transliterate becomes significant to their literacy education

REMOTE-CONTROLLED TWO-WHEELED SELF-BALANCING ROBOT

The article presents the design and fabrication of a remotely controlled two-wheeled self-balancing robot, along with its mobile control by means of an application on a phone displaying basic parameters in a terminal. A 3D model made in SolidEdge software, the electronic components used to build the robot and electronic schematics and software are presented. Real-world tests were conducted that demonstrate the robot's operation. The robot can be used for educational and commercial purposes, as well as in the human home environment

WATER AND FOOD DISPENSER FOR DOGS

The subject of the article is the design and construction of a water and food dispenser for dogs. Its main goal is to present the design of the device adapted to both the requirements of the owners and the dogs themselves. The goals set for this project are to ensure its functionality in all weather conditions. The configuration methods described guarantee the versatility of the device. Design assumptions, a 3D model of the structure, electronics and a fragments of the control program are presented. The actual implementation of the dispenser, possibilities for its modification and, in conclusion, comments and conclusions are presented