13 Oct 2010 ... En ambientes de muy baja gravedad, en cambio, no se necesita ning?n ... hechas de aleaci?n de titanio, vidrio met?lico, y acero inoxidable. ...
NASA Website
13 Oct 2010 ... El acero inoxidable es una aleaci?n (mezcla de hierro, n?quel y cromo), as? como lo es la mayor parte de la orfebrer?a (oro y n?quel). ...
Ion nitriding is a glow discharge process that is used to induce surface modification in metals. It has been applied to 316-L austenitic stainless steel looking for similar benefits already obtained in other steels. An austenitic stainless steel was selec...
National Technical Information Service (NTIS)
The relationship between the degree of sensitization and the corrosion resistance of austenitic stainless steel has been reported since long time, however this relationship does not account for all the experimental results reported on the literature. The ...
Sensitization is a cause of corrosion that has been widely studied in austenitic steels; however, the relationship between sensitization and mechanical properties of steel is less known. Therefore, the objective of this work is to study the mechanical pro...
The intergranular stress cracking of welded joints of austenitic stainless steel, AISI 304, is a serious problem in BWR type reactors. It is associated with the simultaneous presence of three factors; stress, a critical media and sensibilization (DOS). EP...
Corrosion susceptibility under stress of AISI 304 steel sensitized in a sodium thiocyanate solution has been studied and results were compared with those obtained with solutions of thiosulfate and tetrathionate. Sensitized steel type 304 is highly suscept...
The relationship between: microstructure-heat treatment, microstructure-mechanical properties, microstructure-corrosion resistance make that the study of the microstructure of metals and alloys be a powerful tool either in technical-scientific research as...
o bebidas. No combine el aceite de motor usado con cualquier otra sustancia como anticongelante, solvente de pinturas o pintura. Lleve el aceite de motor usado a una estación de...
Science.gov Websites
... que incluye �(1) los art�culos usados como alimento o bebida para el hombre u otros animales, (2) la goma de mascar y (3) los art�culos usados ...
Center for Food Safety and Applied Nutrition (CFSAN)
d'aciers inoxidables austenitiques nickel-chrome". Academie des Science, Comptes Rendus, Paris. Vol. 264,. No. 5, Jan. 30, 1967, pp. 425-428. ...
... been recorded in the diet1. Terrestrial A small police outpost was established on the island in 1969. ... 40 birds, but given its high levels of recruitment, this is probably not a serious threat, t...
NBII National Biological Information Infrastructure
apropiado a ser usado, dando un glosario, archivos de ayuda con los procedimientos para solucionar problemas
E-print Network
The publication presents the papers delivered in a workshop about trials and selection of the steels and their thermal treatments for stamping industry.
... including a direct microscopic examination and sodium nitrate flotation, completed during quarantine in May 2002 were negative ... negative for acid-fast staining organisms. Four fecal flotation examinati...
Initial Environmental Impact Assessment. 1991. J.M. Acero, J.L. Agraz, C.A. Aguirre and J. Plotz. Instituto Antartico Argentino and Alfred Wegener Institut ...
-- 116. Bhattachary, D. 1998. Enviromental values: a critical ap� praisal of cost�benefit analysis
Environmental impact assessment associated with the salvage operation of the ... Initial Environmental Impact Assessment. 1991. J.M. Acero, J.L. Agraz, C.A. ...
grant (FA9550-04-1-0117), an AFRL grant via Veridian and an NSF grant (IIS-0534707). We thank A. Acero
The purpose of the publication is to explain in an easy way the traditional process of steel manufacturing, and to promote the interest of the foundrymen working without large investment.
Many tropical fruits are rich in anthocyanins, though limited information is available about the characterization and quantification of these anthocyanins. The identification of anthocyanin pigments in four tropical fruits was determined by ion trap mass spectrometry. Fruits studied included acero...
Technology Transfer Automated Retrieval System (TEKTRAN)
Adem?s, la gu?a incluye la historia de los paseos espaciales, un traje usado en la NASA en la actualidad, un glosario de t?rminos, lecturas recomendadas y ...
... usado pela The Nature Conservancy para a conservação de áreas protegidas e medidas do sucesso das ações de conservação....
compilaciones abarcan términos que han sido usados en el léxico de granjería, alimentos, nutrición, silvicultura, y más de una docena de otros temas agrícolas...
25 Nov 2001 ... Un tipo, a?n muy usado, es el llamado magnet?metro de saturaci?n ("Fluxgate magnetometer"), basado en la saturaci?n de materiales magn?ticos ...
La condensaci?n ocurre cuando un gas (vapor de agua es usado en ... se forman en la superficie de la botella. Esto es CONDENSACION, y las ...
de Artículos Usados Requerimiento de Licitación (RFQ) Visas Solicitud Inteligente DS-160 Horario de Actividades Visas Para Extranjeros Casos en Proceso Administrativo Citas...
5 Mar 2011 ... Estar?n desempacando el modulo desarmando dispositivos usados en el lanzamiento y moviendo los materiales de embalaje al Veh?culo de ...
nalysis", que fornecia como saida, ajustes de superfTcies de ate oitavo grau. 0 programa foi usado para as variaveis dis criminat~rias, num total de 299 ...
6 May 2009 ... Este papel es 100% papel de desecho usado por el consumidor. ... Adem?s, este bolet?n fue impreso usando el 100 % de tintas con aceites de ...
... Si los restos del pesticida no pueden ser propiamente usados, averig�e con su autoridad local de manejo de residuos s�lidos, agencia ambiental ...
EPA Pesticide Factsheets
... usgs.gov Abstract We studied Wilson's Warbler (Wilsonia pusilla) and Yellow Warbler (Dendroica petechia) habitat use in ... Habitates reproductivos usados por las poblaciones de la Wilsonia pusilla y la ...
o bebidas. No combine el aceite con otras sustancias químicas tales como anticongelante, solvente o pintura Lleve el aceite de motor usado a una estación de servicio u...
.5% methoprene) � Registrado para ser usado en "cualquier lugar". De acci�n bastante lenta, 2-3 meses si aplicado tratamiento individual de colonias. Amdro Fire Strike (0.036% hydramethylnon + 0.0172% s-methoprene caballos. Extinguish Plus (0.25% s-methoprene + 0.36% hydramethylnon) � Los mismos ingredientes usados en
can be included in modeling the language (Wang, 2000; Erdogan et al., 2002). In this article, we accuracy may indeed be two very different businesses after all. References Erdogan H. Sarikaya R. Gao Y
In order to protect carbon steel of towers and piping of a GS experimental heavy water plant against corrosion produced by the action of aqueous solutions of hydrogen sulphide, a method, elsewhere published, was developed. Carbon steel exposed to saturate...
In order to protect carbon steel towers and piping of Girlder sulfide (G.S.) experimental heavy water plants against corrosion produced by the action of aqueous solutions of hydrogen sulfides, a method, previously published, was developed. Carbon steel, e...
The Atlas summarizes the experience of almost two decades of applied research in the siderurgical industry (IAS-CNEA joint agreements), by means of hot torsion test to evaluate the hot workability in steels through ductility properties and the formation s...
Within the framework of the development of low activation structural materials to be used in nuclear fusion reactors four martensitic Fe-9,5 Cr alloys were conceived with different contentsof tungsten-tantalum and/or germanium as substitutions for Mo, Ni,...
The main objective of the work was to determine the most common defects occuring in tool steels of the AISI D-2, S-1, 0-1 and W-2 series during thermal treatment. Defects were evaluated by metallographic analyses, a method used to determine and recognize ...
This is a theoretical-experimental laboratory study on the Electroslag Remelting Technology (ESRT) of high quality steels. The objective of this study was to analyze the problems that this technology entails and thus facilitate its industrial application ...
Maraging steel fabrication process metallurgy and cost effectiveness were investigated. Experimental melts were carried out in an induction furnace under argon atmosphere, and alternatively with vacuum remelting or direct induction melting under vacuum. A...
In this work, metallic coatings of nickel was made over carbon steel using two different electrolytic solutions: The Watts's bath and the nickel sulfamate bath, using a pulse variable current. The method use was the traditional method, its means a thermos...
The experimental study focused on the behavior of six different steels, of approximately 0.35% C and various contents of Cr, Ni, and Mo. Each of these steels were tested in order to determine its fatigue limit to 10 million cycles, in 5 different states (...
Telemetry Systems, Isanti, MN, USA; Holohil Systems, Carp, ON, Canada). All radios were attached ventrally-knobbed hornbill Aceros cassidix during the non-breeding season. � In: Poonswad, P. (ed.), The Asian hornbills
With this work it is demonstrated the possibility of performing the nitriding process by using a CVD-ECR source, based on the results obtained after treating several samples of AISI H-12 steel. Also, the main operating parameters (time of treatment, sampl...
The peak stress and the steady state values for free cutting, carbon and alloyed steels deformed at high temperatures were obtained in this paper as a result of two regressions. With these data and the peak deformation values obtained in a former work, st...
Phosphate coatings are inorganic crystalline deposits laid down uniformly on properly prepared surfaces by a chemical reaction with the treated base metal. The reaction consists in dissolving some surface metal by acid attack and then causing surface neut...
'anodo de carb'on, reaccionando con 'el y produciendo di'oxido de carbono (ver [8]). En los ' ultimos a aislantes. Contiene un c'atodo formado por un bloque de carb'on atravesado por una barra de acero en cuyo
Thin high-? oxide films on InAs, formed by atomic layer deposition, are the key to achieve high-speed metal-oxide-semiconductor devices. We have studied the native oxide and the interface between InAs and 2 nm thick Al2O3 or HfO2 layers using synchrotron x-ray photoemission spectroscopy. Both films lead to a strong oxide reduction, obtaining less than 10% of the native As-oxides and between 10% ...
NASA Astrophysics Data System (ADS)
El tamoxifeno se ha usado por más de 30 años en el tratamiento de cáncer de seno en mujeres y hombres. El tamoxifeno se usa para tratar a pacientes con cáncer de seno en estadio inicial y también con cáncer de seno metastático (cáncer que se ha diseminado a otras partes del cuerpo).
Cancer.gov
Fifteen Spanish institutions took part in the European intercomparison of dosimeters promoted by DGXI of the EEC and steered by the German National Laboratory, PTB. The aim was to ascertain the measurement errors in the assessment of air kerma for the ene...
, that are used to control varroa mites (Varroa destructor): pyrethroids (fluvalinate - Apistan� ), botanical productos qu�micos usados para el control del �caro varroa (Varroa destructor): piretroides (fluvalinato is affected by three acaricides, representing three chemical classes, that are used to control varroa mites
Purification of human prolactin from pituitaries was carried out in our laboratory to obtain a pure reagent for use in RIA. The extraction and purification procedure was adapted from the method of Mc. Lean et al., and it involves the following steps: 1. E...
... probablemente no son congéneres. Se ha usado el número de sensoria sobre los segmentos III y IV ... Australia que es reportada aqui varía en el número de sensoria entre individuos y aún entre la ... ...
9 Ago 2009 ... El Leonardo, el Modulo Log�stico de Prop�sitos M�ltiples contiene 2412 libras de carga de regreso y el conjunto del tanque de amoniaco usado ...
27 May 2011 ... En el Carruaje3 de log?stica expreso en la estructura, ellos removieron unos soportes usados en el lanzamiento de un brazo de repuesto para ...
15 Abr 2010 ... El ensamblaje del tanque es usado para presurizar y ajustar a la expansi?n y contracci?n del amoniaco que circula a trav?s de los radiadores ...
9 Abr 2010 ... El amoniaco es usado por el sistema de enfriamiento de la estaci?n. Hoy d?a, los caminantes espaciales levantaron el tanque nuevo desde el ...
9 Jun 2009 ... Dentro de la Estaci?n, los miembros de la tripulaci?n reemplazaron uno de los 16 pernos que sujetan los mecanismos de acople usados para ...
9 Feb 2009 ... Comenzaron con el tanque de amoniaco que estaba vac?o en la estructura P1 ... El amoniaco en los tanques es usado para enfriar la Estaci?n y ...
2 Sep 2009 ... Comenzaron con el tanque de amoniaco que estaba vac?o en la estructura P1 ... El amoniaco en los tanques es usado para enfriar la Estaci?n y ...
20 May 2009 ... Tambi?n chequear?n el sistema de control de los propulsores a reacci?n y los controles de vuelo que ser?n usados para controlar su reentrada ...
Regrese a Breve 8 ¿En los últimos 12 meses, ha usado usted Internet o correo electrónico para comunicarse con un médico o con el consultorio de un médico? Porcentajes calculados de la población estadounidense en 2003 y 2005 con respecto a usuarios de
The English-Spanish/Spanish-English equivalent translation of scientific and management terms (Jargon) commonly used in the field of natural resource management are presented. The Glossary is useful in improving communications and fostering understanding ...
In this report, the definition of hot channel factors and sub-factors used to quantify and qualify the nuclear power distribution and the thermal hydraulic performance of the core for KWU reactor (Angra 2 and 3) and Westinghouse (Angra 1), are presented. ...
... en el sitio de estudio (Pozo, 2001), los animales presentan una alta preferencia para dormir en ellos. Así, este artículo demuestra la ... de los árboles dormideros, permite calificar a estos animales com...
C?mo jugar Trap-n-Zap DOS BARRAS: La barra dorada muestra cu?nto combustible tienes. La barra p?rpura muestra cu?nto tiempo de juego has usado. ...
. Recycle Used Motor Oil, 1 page, Winter 2003 (EPA 530-F-02-027) ___52027 Si lo tira, se lo toma. Recicle el aceite usado de motor. (Spanish version of You Dump It, You Drink It. Recycle Used Motor Oil), 1 page
It is well known that stable and efficient liquid-junction photovoltaic solar cells based on n-CuInSe/sub 2/ photoanodes can be obtained by coating the semiconductor surface with an indium-oxide layer and by employing an aqueous polyiodide solution containing Cu/sup +/, In/sup 3+/, and H/sup +/ ions. In this work, the authors further investigated the polycrystalline n-CuInSe/sub 2/-indium ...
Energy Citations Database
This paper is part of a series which corresponds to the carbon steel behaviour as construction material for Girlder sulfide (G.S.) heavy water plants. The present work analyses the iron concentration study during passivation in the passivating fluid. At t...
In heavy water plants that use the bithermal exchange H(sub 2)S-H(sub 2)O, a protective scale against corrosion is formed by the action of a solution of H(sub 2)S at high temperature for a tile between 10 to 14 days. Exposure to humid air during plant shu...
In order to protect carbon steel towers and piping of a GS experimental heavy water plant against corrosion produced by the action of aqueous solutions of hydrogen sulphide, a method, elsewhere published, was developed. Carbon steel exposed to saturated a...
The passivation on carbon steels, in particular ASTM A 516 Degree 60 and ASTM A 333 steels is made, submitting it to the action of H(sub 2)S/H(sub 2)O(sup 1,2) corrosive medium. The steel is rapidly corroded by H(sub 2)S in aqueous solution, forming iron ...
In order to protect carbon steel towers and piping of Girlder sulfide (G.S.) experimental heavy water plants against corrosion produced by the action of aqueous solutions of hydrogen sulfide, a method, previously published, was developed. Carbon steel, ex...
An ASTM A 516 degree 60 carbon steel superficial protection technique submitted to a hydrogen-water sulfide corrosive medium at 2 MPa of pressure and 40-125 deg C forming on itself an iron sulfide layer was tested. Studies on pH influence, temperature, pa...
This work describes the assays aimed to passivate the steel carbon of the process pipings. This steel is marked by the ASTM A 333 G6 and is chemically similar to those of isotopic exchange towers which corrode in contact with in-water hydrogen sulfide sol...
de la meteorizaci�n de una balsa de residuos pir�ticos Patricia Acero Salazar #12;Estructura del proyecto Evoluci�n flujo y transporte reactivo en zona no saturada de balsas de residuos pir�ticos residuo (Tailings) Presa Capa agua anti-oxidaci�nEvaporaci�n O2 Tongadas sucesivas #12;O2 #12;Objetivos del
would require low B-field (magnetic field damping after ... VHE �-rays. H.E.S.S. prelim. HESS VHE excess map. XMM map (2-4.5 keV) smoothed to HESS PSF preliminary ... B&W map: ATCA 1.4 GHz. Tian et al., ApJ 2008. Color map: H.E.S.S. �-ray excess ... Matching increase in absorption derived from 12CO observations ...
The susceptibility of a 17-4PH type steel to Stress Corrosion Cracking (SCC) in low pressure steam turbine environments was assessed using slow strain rate test at 90 Centigrade and at 1.35x10(sup -6) seg(sup -1). Environments tested included different co...
The most common and plesiomorphic mechanism of food transport in tetrapods is lingual-based. Neognathous birds use this mechanism for exploiting a large diversity of food resources, whereas paleognathous birds use cranioinertial mechanism with or without tongue involvement. Food transport in three hornbills' species (Aceros cassidix, A. undulatus, and Buceros hydrocorax) is ...
PubMed
Thin high-{kappa} oxide films on InAs, formed by atomic layer deposition, are the key to achieve high-speed metal-oxide-semiconductor devices. We have studied the native oxide and the interface between InAs and 2 nm thick Al{sub 2}O{sub 3} or HfO{sub 2} layers using synchrotron x-ray photoemission spectroscopy. Both films lead to a strong oxide reduction, obtaining less than 10% of the native ...
As complement to the experiences on carbon steel passivation for its use in G.S. (Girlder sulfide) heavy water production plants, the results herein obtained are given, processing the material with a saturated solution at 2.3 MPa of full pressure and 125 ...
This is a listing of energy related equipment available through the Energy-Related Laboratory Equipment Grant Program which grants used equipment to institutions of higher education for energy-related research. Information included is an overview of the program, how to apply for a grant of equipment, eligibility requirements, types of equipment available, and the costs for the institution.
DOE Information Bridge
Background. Heme oxygenase-1 (HMOX1) and bilirubin UDP-glucuronosyltransferase (UGT1A1), both enzymes involved in bilirubin homeostasis, play an important role inoxidative stress defense. Objective. To assess the effect of promotervariations of HMOX1 and UGT1A1 genes on the progression of fibrosis in patients chronically infected with the hepatitis C virus (HCV). ...
Sterile male insects, mass-reared and released as part of sterile insect technique (SIT) programs, must survive long enough in the field to mature sexually and compete effectively with wild males for wild females. An often reported problem in Mediterranean fruit fly (medfly) Ceratitis capitata (Wiedemann) SIT programs is that numbers of released sterile males decrease rapidly in the field for ...
New developments with bainite have resulted in a steel with an ultimate tensile strength of 1.7-2.5 GPa and a toughness in excess of 30-40 MPa m1/2. The novel microstructure is generated in a high carbon high silicon steel isothermally transformed at temperatures of 200 C-350 C. Iron does not diffuse during the transformation to bainite at this low temperature. As a result, 20-40 nm thick plates ...
A liquid bridge is a mass of liquid sustained by the action of the surface tension force between two parallel supporting disks Apart from their basic scientific interest a liquid bridge can be considered as the simplest idealization of the configuration appearing in the floating zone technique used for crystal growth and purification of high melting point materials footnote Messeguer et al emph ...
Schwertmannite, an iron oxyhydroxide sulfate nanomineral, plays a significant role in the geochemistry of acid mine drainage (AMD) as a metastable phase with respect to goethite and by retaining toxic metals, e.g. arsenic [1]. Schwertmannite�s characteristic morphology is needles 100-300 nm long and only 5-10 nm in diameter extending from a dense aggregate. The poorly-and nano-crystalline nature ...
In many chess tournaments the number of players is much larger than the number of rounds to be played. In such tournaments the Swiss pairing system is usually used. This means that players with equal or almost equal scores so far are played against each other. Moreover, each player should alternately have, if possible, white and black pieces, and every pair of two players is allowed to play at ...
Quality control procedures for Bactrocera philippinensis Drew and Hancock 1994 (Diptera: Tephritidae) used in sterile insect technique (SIT) programs were established in the mass rearing facility at the Philippine Nuclear Research Institute. Basic studies on pupal irradiation, holding/packaging systems, shipping procedures, longevity, sterility studies, and pupal eye color determination in ...
BackgroundAlthough nowaday it is broadly accepted that mitochondrial DNA (mtDNA) may undergo recombination, the frequency of such recombination remains controversial. Its estimation is not straightforward, as recombination under homoplasmy (i.e., among identical mt genomes) is likely to be overlooked. In species with tandem duplications of large mtDNA fragments the detection of recombination can ...
PubMed Central
The parasitoid Lipolexis oregmae Gahan (introduced as L. scutellaris Mackauer) was imported from Guam, evaluated in quarantine, mass reared, and released into citrus groves in Florida in a classical biological control program directed against the brown citrus aphid, Toxoptera citricida Kirkaldy. Releases of 20,200, 12,100, and 1,260 adults of L. oregmae were made throughout Florida during 2000, ...
Neste trabalho apresentamos os principais resultados do estudo da popula��o de gal�xias an�s de baixo brilho superficial dos grupos compactos HCG44 e HCG68. A inclina��o do extremo de baixa luminosidade a da fun��o de luminosidade desses grupos foi estimado atrav�s de simula��es de Monte Carlo. O m�todo consistiu em simular gal�xias an�s de baixo brilho superficial em ...
The karst environment is one of the most challenging in terms of groundwater, engineering and environmental issues. Geophysical methods can provide useful subsurface information in karst regions concerning, for instance, hazard estimation or groundwater exploration and vulnerability assessment. However, a karst area remains a very difficult environment for any geophysical exploration; selection of ...
Abstract Objective: Masking level difference (MLD) tests are an established component of auditory processing test batteries; however, normative data for these tests vary according to procedure. The purpose of this study was to establish a standardized procedure for clinical use in the measurement of the MLD Design: A newly developed computer software program using both an adaptive procedure (MLDA) ...
Tem-se constatado uma preocupante car�ncia no ensino de astronomia nos diversos n�veis de escolaridade. Neste trabalho discutimos v�rias pr�ticas did�tico-pedag�gicas que vimos desenvolvendo para crian�as, jovens e adultos em processo de alfabetiza��o, visando contribuir para reparar aquela car�ncia. Propomos uma metodologia que incorpora as recentes exig�ncias das ...
Discos de acr�scimo s�o aparatos c�smicos que permitem que mat�ria seja eficientemente acrescida sobre uma fonte compacta pela remo��o de momento angular via tens�es viscosas enquanto transforma a energia potencial gravitacional em calor e, posteriormente, em radia��o. Sistemas bin�rios semi-ligados, como Vari�veis Catacl�smicas (VCs) n�o-magn�ticas, s�o talvez os ...
Elevated salinity in groundwater (over 250 mg/l chloride) in a fractured chalk aquifer in the municipality of Greve, Denmark, has been attributed to seawater intrusion from the Baltic Sea, resulting in the closure of a number of wells nearest to the coastline. However, a recent study in eastern Denmark shows that the salinity could also be from ancient connate pore waters. Historical chemistry ...
The ensemble Kalman filter (EnKF), an efficient data assimilation method showing advantages in many numerical experiments, is deficient when used in approximating covariance from an ensemble of small size. Implicit localization is used to add distance-related weight to covariance and filter spurious correlations which weaken the EnKF�s capability to estimate uncertainty correctly. The effect of ...
531 imagens contidas no The International Halley Watch Atlas of Large-Scale Phenomena (Brandt et al., 1992) cobrindo o per�odo de setembro de 1985 a julho de 1986 foram analisadas visando identificar, caracterizar as propriedades e correlacionar estruturas morfol�gicas da cauda de plasma do cometa P/Halley. A an�lise revelou 47 eventos de desconex�o (DEs) (Niedner & Brandt, 1979; ...
Abigail Alvarez OlarteCINVESTAV Alba Leticia Carrillo MonteverdeDCI-UG Alberto Carrami�anaINAOE Aldo MorselliFERMI Alejandro CastillaDCI-UG Alejandro IbarraTechnical University of Munich Alma D Rojas PachecoFCFM-BUAP Alma Xochitl Gonzalez MoralesInstituto de Ciencias Nucleares, UNAM Andrew Walcott BeckwithAmerican Institute of Beam Energy Physics Ariadna Montiel ArenasDepartamento de F�sica, ...
This study presents the establishment of sustainable development and management policies for the K���k Menderes River Basin aquifer system in western Turkey. Geological, hydrogeological, and geophysical data are used conjunctively to define various hydrogeological units and their geometry. Distributions of hydraulic-parameter values and recharge are estimated by geostatistical methods and ...
Karst aquifers have complex and original characteristics which make them very different from other aquifers: high heterogeneity created and organised by groundwater flow; large voids, high flow velocities up to several hundreds of m/h, high flow rate springs up to some tens of m3/s. Different conceptual models, known from the literature, attempt to take into ...
R�sum� En �cologie v�g�tale, le site est un concept central. Un site, c'est l'endroit o� une esp�ce v�g�tale ou une communaut� de plantes se d�veloppe le site assure un ensemble de conditions dans lesquelles elles vivent. Dans un mat�riau homog�ne � l'origine, l'�coulement gravitaire d'une nappe influence les conditions du site par l'interm�diaire de la distribution ...
The Cross River State, Nigeria, is underlain by the Precambrian-age crystalline basement complex and by rocks of Cretaceous to Tertiary age. The exploration for groundwater in this area requires a systematic technique in order to obtain optimum results, but the non-availability of funds and facilities has made it extremely difficult to carry out site investigations prior to the drilling of water ...
Numerical simulation was used to enhance conceptual understanding of the post-Pleistocene hydrogeology of a layered sequence of clastic and evaporite sediments. This work is part of an effort to evaluate the suitability of the Waste Isolation Pilot Plant (WIPP), New Mexico, USA, as a repository for transuranic waste. The numerical model is three-dimensional, extends laterally to topographic ...
Matrix-diffusion parameters deduced from an infiltration tracer test at Idaho National Laboratory (INL), USA, are combined with other site information in an analysis involving two dimensionless lumped parameters to assess the effects of matrix diffusion on contaminant transport at the INL over longer distance and time scales than were evaluated in the test. Matrix diffusion was interrogated in the ...
Efforts are being made to improve the irrigation efficiency in the Murray-Darling River Basin, Australia, to deal with predicted rainfall decline and to reduce the incidence of secondary soil and water salinization. The latter commonly occurs as a result of locating water reservoirs upon relic drainage channels. To better manage irrigation, information is required about the spatial distribution of ...
SUMMARY: A nonlinear selection index (NL) method was compared with restricted linear index (RI) using two experiments of upward selection for the weight/(lenght)(n) ratio in Tribolium castaneum. The first experiment was designed to increase pupal weight/(pupal length)(2) , while the second experiment was intended to improve larval weight/(larval length)(3) . Larval and pupal traits were measured ...
In some areas close to a reverse fault with significant vertical displacement, or the boundary of a mining area in multi-layer rock and the boundary of perched water, the phreatic water-level changes abruptly from one side of the fault or boundary to the other. There is no direct hydraulic connection between the two sides and a groundwater fall occurs across the fault or boundary. This groundwater ...
Irrigation in semi-arid agricultural regions can have profound effects on recharge rates and the quality of shallow groundwater. This study coupled stable isotopes (2?, 18O), age-tracers (3H, CFCs, 14C), 87Sr/86Sr ratios, and elemental chemistry to determine the sources, residence times, and flowpaths of groundwater and agricultural contaminants (e.g. NO{3/-}) in the Saddle Mountains Basalt ...
Riparian groundwater evapotranspiration (ETg) constitutes a major component of the water balance especially in many arid and semi-arid environments. Although spatial and temporal variability of riparian ETg are controlled by climate, vegetation and subsurface characteristics, depth to water table (DTWT) is often considered the major controlling factor. Relationships between ETg rates and DTWT, ...
Nowadays is widely well know that the potato is an important vegetable crop at Braz�l. It is grown on about 173.000 ha, with total yield of 2.6 million tons year-1. The average yield is 15 t ha-1. This level is very low because degeneration of crop is rapid under high temperature and high viruses pressure. Therefore seed potato propagation and production is principal on consumption potato ...
Geologically complex crystalline aquifers underlie large parts of the semi-arid Limpopo Province where some of the greatest groundwater needs in South Africa occur. It is important to identify potentially high-yielding zones that can be targeted for water supply. The study covered four distinct geologic and morpho-structural domains within Limpopo Province, together covering about 23,500 km2. ...
