Two computer codes that are available at IPEN for analyses of static neutron diffusion problems are studied and applied. The CITATION code is animed at analyses of criticality, fuel burnup, flux and power distributions etc, in one, two, and three spatial ...
National Technical Information Service (NTIS)
Two computer codes available at IPEN are studied and applied to analyze time-dependent problems of nuclear reactors. The GAPOTKIN code can be used to analyze short-term transient behaviours and the CITATION code is applicable to long-term burnup analysis....
A model for the evaluation temperature distributions in graphite during annealing operation in graphite. Moderated an-cooled reactors, is presented. One single channel and one dimension for air and graphite were considered. A numerical method based on fin...
Thermoelectric Electromagnetic (TEEM) Pumps can be used for controlling the fluid flow in the primary and secondary circuits of liquid metal cooled space nuclear reactor. In order to simulate and to evaluate the pumps performance, in steady-state, the com...
This work uses the neutron two-groups model to establish the basic equations of spatial Xe oscillations control in power reactors. It is considered that slow neutrons and temperature alignment are in equilibrium with the neutron flux. (A.C.A.S.). (Atomind...
The main methods for calculations of fuel depletion are studied and some approaches to do it are mentioned; the LEOPARD Code is described and full details are given for each subroutine, flow charts are included; the method given by the code for calculatio...
The main methods for calculation of fuel depletion are studied and some approaches to do it are mentioned; the LEOPARD Code is described and full details are given for each subroutine, flow charts are included; the method given by the code for calculation...
A digital computer code KIBE was developed to simulate the transient behavior of a Steam Generator used in Pressurized Water Reactor Power PLants. The equations of Conservation of mass, energy and momentum were numerically integrated by an implicit method...
Sensitivity calculations are very important in design and safety of nuclear reactor cores. Large codes with a great number of physical considerations have been used to perform sensitivity studies. However, these codes need long computation time involving ...
A model to analyse a postulated accident scenario involving loss of forced flow in the reactor vessel of a LMFBR is used. Five phases of the accident are analysed: Natural Circulation, Subcooled Boiling, Nucleate Boiling, Core Dryout and Cladding melt. Th...
, Baltimore, MD 21287. � American Society of Neuroradiology AJNR Am J Neuroradiol 23:416�421, March 2002 416 for endovascular em- bolization prior to possible radiation therapy. AJNR: 23, March 2002 TAILORED COGNITIVE is expected. 418 MOO AJNR: 23, March 2002 #12;undertaken, and the patient was referred for subse- quent radiation
E-print Network
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. ...
An integrated 3-D model of a research PWR reactor core support internals structures was developed for its dynamic analyses. The static tests for the validation of the model are presented. There are about 90 super-elements with, approximately, 85000 degree...
Using the theorectical basis established in part one, an estimate was made of the fast effect in beryllium on the infinite multiplication factor of heterogeneous thermal reactors moderated by beryllium. Using available data relative to the different collision cross sections involved, the result obtained was a 7 % increase in the multiplication factor. This value is in agreement with ...
Energy Citations Database
A method for foreseeing departure from nucleate boiling phenomenon in Westinghouse reator cores (OT delta T- signal for reator shut down) is described. The results from investigations done with the OT delta T system and in the efficiency of different meth...
... investigate the feasibility of thermographic inspection for facilities of the Japan Materials Testing Reator in Japan Atomic Energy Research Institute. ...
DTIC Science & Technology
... rocket chamber, and several possible methods for dynamic measurement ... "quent failures have occurred ... and ground on a modified model spark plug ...
For each positive integer n, let Fn be a free group of rank n with basis (in other words, free generating set) {x1, �, xEM>n>} . If [theta] is an automorphism of <EM>Fn> then {<EM>x>1[theta], �, ...
NASA Astrophysics Data System (ADS)
... mi of zerodur (a glass ceramic with zero ... $1.4 million and aw-iru Technologies British companies ... neutron spectnm zooled reator technology, and the ...
... illuminate the entire volume of space under aurveillance ... uý .....quent to the interim Fence operation have ... The ten filters were spaced 100 cps apart ...
... Britain's weakness, ap- peasement, and conse- quent failure to deter Hitler in the 1930s has been well rehearsed elsewhere. ...
... the major crisis in the 1980s, when political leadership under Zia-ul-Haq and subse- quent civilian leaders, like Benazir Bhutto and Nawaz Sharif ...
... Methods cestode parasites, and intestinal helminths were more fre- quent among non-caucasian, non-black Navy personnel. ...
it, such as those found for Anas platyrhynchos (40) are more fre- quent. In developing a calculating procedure based on the chord ...
NASA Website
... tool for management and control of hard- wood competition in loblolly ... quent fire needed for diverse southern pine grassland woodlands (Mitchell et ...
1) an increase in the proportion of PAS-positive cells which stimulate mitotic activity .... quent staining and microscopic examination. ...
... After receiving and validating the initial heartbeat for a hash chain, subse- quent MAC ... number of keys which is roughly proportional to the log of the ...
quent runs of the same configuration, XR is available from the data output. ..... XR and its value. The Laplace potential field convergence information and ...
An appropriate method for the calculation and transient performance of the pressurizer of a pressurized water reactor is presented. The study shows a digital program of simulation of pressurizer dynamics based on the First Law of Thermodynamic and Laws of...
A catalog of the radioisotopes prepared by the IEA R-1 Reactor, their characteristics, method of formation, cross section, and specific activity is presented. (J.S.R.)
A medida que uma estrela evolui, sua trajet�ria no diagrama-HR passa pelas chamadas "faixas de instabilidade" podendo tornar-se uma vari�vel. Ao longo da seq��ncia das an�s brancas existem tr�s faixas de instabilidade, contando com a faixa das pr�-an�s brancas (DOs). Estrelas nestas faixas podem apresentar pulsa��es n�o-radiais com per�odos bastante est�veis, ente 100 e ...
Existe um gradiente radial de abund�ncias no disco gal�ctico, cujo comportamento � razoavelmente bem conhecido para dist�ncias galactoc�ntricas entre 3 e 10 kpc. Foi obtido a partir de resultados derivados de nebulosas planet�rias, regi�es HII e estrelas, como as estrelas quentes de tipo O, B e aglomerados abertos. Com o objetivo de investigar o comportamento ...
It is a classical result of Postnikov [15] that homotopy types X with at most two non-trivial homotopy groups [pi]mX = A and [pi]n<EM>X> = <EM>B>, 2 [less-than-or-eq, slant] <EM>m> < <EM>n>, are classified by the ...
The theory of reductive monoids has been well developed by Renner and the author, cf. [8, 13]. This paper concerns the finite reductive monoids MF where M is a reductive monoid and F[ratio]MEM>[rightward arrow]<EM>M> is a Frobenius map. We show that the Deligne-Lusztig characters ...
We compute the (uni)versal deformation ring of an odd Galois representation [rho]: Gal (M/Q) [rightward arrow] Gl2(Fp) with an upper triangular image, where MEM> is the maximal abelian pro-<EM>p>-extension of <EM>F>[infty infinity] unramified outside a finite set of places ...
. Based on the assumption that the light-induced movement of the chromophore induces all subse- quent- ence of the residue rearrangements on the energy landscape of light-induced switching in Dronpa, Japan). Proteins were expressed Fig. 3. Model for a cascade of residue rearrangements upon light-induced
Camada muito quente e externa da atmosfera de uma estrela. ... Camada no meio de um planeta, localizada entre a crosta, ou superf?cie, e o centro. ...
consists of a scope of variables to which it is applied, and a relation of allowed values for those of assignments to variables such that no variable is assigned more than one value by . The scope of an assignment. If in a subse- quent call Inc(Ci, D ), D is identical to D when restricted to the variables in scope
Patricia Adair Gowaty Distinguished professor, Department of Ecology & Evolutionary Biology by increasingly fre- quent arguments, being made by people out- side the field of evolutionary biology, molecular or developmen- tal biology that has caused a ripple in our basic understanding of evolutionary
increased risk of hypertension with the use of other targeted drugs and antiangiogenesis agents, including sunitinib (Sutent). To see if sorafenib also increases this risk, and subse-quent risk of heart attacks and other serious cardiac events, the
Cancer.gov
... was hold 3 - 20 March at 12th Aviation Group ... SUBJECT MLL for Period *ding 3O April 1070, RCS CFOR ... Throughout the night he cv?0-'KR fli quent ...
of assessing an organization's process maturity, are its maturity levels, key process areas, and their goals include the maturity level of the organization, the identified process strengths and weaknesses between assessments in those cases where organizations moved up in level on a subse- quent assessment
missions in 1975, and subse- quent Mars missions launched in the 1990s and 2001. The earlier missions were .... the future. I'm humbled by their accomplishments and treasure their memories. .... left wing, the one facing the camera. ...
... disques semis de B. anthracis en faible concentration citajent de culture negative et qu'on pouvait par cons6quent les manipuler dans des ...
the conse- quent) to the initial context set of presuppositions,'' and that we analyze the subjunctive mood to the presupposition set of the actual context of utterance by the use of the conditional and subjunctive. Stern of conditionals and the subjunctive. The crucial question, though, is whether these points serve to establish
EMS Review A review of the Wallops EMS, following EMS audit principles and .... accordance with WFF-EM-002, Wallops EMS Training Manual, located at: ...
Management Systems (EMS) EMS Basic Information EMS Training EMS Success Stories Waste Management Related Initiatives Waste Environmental Management Systems (EMS) Environmental...
Science.gov Websites
The low-Reynolds-number collision and rebound of two rigid spheres moving in an ideal isothermal gas is studied in the lubrication limit. The spheres are non-Brownian in nature with radii much larger than the mean-free path of the molecules. The nature of the flow in the gap between the particles depends on the relative magnitudes of the minimum gap thickness, h[prime prime or minute]o, the ...
Este trabalho consiste no estudo de uma amostra de estrelas simbi�ticas amarelas cujas componentes frias apresentam tipos espectrais G ou K. Uma amostra de 20 estrelas foi usada, o que corresponde ao conjunto completo de estrelas simbi�ticas amarelas vis�veis no hemisf�rio sul presentes no cat�logo de Belczynski et al (2000 A&A Suppl. 146, 407). Os espectros estelares foram obtidos ...
Stably stratified flows past three-dimensional orography have been investigated using a stratified towing tank. Flows past idealized axisymmetric orography in which the Froude number, Fh=U/Nh (where U is the towing speed, N is the buoyancy frequency and hEM> is the height of the obstacle) is less than unity have been studied. The orography considered consists of two ...
We show that the sequence 2n+n is a universal Hilbert sequence. That is, for each polynomial P(T, Y) irreducible in [open face Q](T) [YEM>], the polynomial <EM>P>(2<EM>n+n>, <EM>Y>) is irreducible in [open face ...
For E a subset of [open face R]n and s [set membership] [0, n] we define upper and lower box dimension profiles, B-dims<EM>E> and B-dim<EM>sE> respectively, that are closely related to the box dimensions of the orthogonal projections of <EM>E> onto ...
Let M be a compact, orientable 3-manifold with [partial partial differential]M a torus. If r is a slope on [partial partial differential]M (the isotopy class of an unoriented essential simple loop), then we can form the closed 3-manifold M(r) by gluing a solid torus V<EM>r> to <EM>M> along their boundaries in such a way that ...
