scholarly journals Environment Effect Treatments in PWR Whole-Core Pin-by-Pin Calculation

2021 ◽  
Vol 9 ◽  
Author(s):  
Bin Zhang ◽  
Yunzhao Li ◽  
Hongchun Wu
Keyword(s):  
Diffusion Coefficient ◽  
Cross Section ◽  
Least Squares Method ◽  
Surface Flux ◽  
Relative Importance ◽  
Multivariate Polynomial ◽  
Environment Effect ◽  
The Core ◽  
Removal Cross Section ◽  
Relative Errors

The environment effect arises when pin-cell homogenized parameters are generated with reflective boundary conditions. To treat it in whore-core pin-by-pin calculation, two works are summarized in this article. Firstly, by analyzing the relative errors of pin-cell homogenized group constants and the relative importance of pin-cell discontinuity factors (PDF) in each group, the importance of correcting the PDF of the thermal group is recognized. Secondly, the least-squares method for a multivariate polynomial is utilized to functionalize the relation of the thermal group PDF and the core parameters, including diffusion coefficient, removal cross-section, neutron source, and normalized surface flux. The C5G7 and KAIST benchmarks are employed to evaluate the performance of the PDF predication. Numerical results indicate its effectiveness in reducing the errors of eigenvalue and pin power, especially for the cases with the fuel pins located near the interface between different assemblies.

Weak-Tie Confidants

2017 ◽  
Author(s):  
Mario Luis Small
Keyword(s):  
Social Interaction ◽  
Graduate Students ◽  
Network Structure ◽  
Relative Importance ◽  
The Core ◽  
Structure Versus

This chapter examines the “core discussion networks” of graduate students in three departments and shows that, contrary to traditional expectations, many of the ties appear to be weak rather than strong. It considers how the students relate to those they have considered their confidants after six months, and more specifically whether they would as a whole report the same confidants. Three perspectives on the relative importance of network structure versus social interaction are discussed based on the students’ different experiences: the students will keep most confidants, they will drop many of their confidants, or they will drop many confidants but quickly replace them. In general, the students replaced their confidants often.

scholarly journals Methanesulphonic acid movement in solid ice cores

2004 ◽  
Vol 39 ◽  
pp. 540-544 ◽  
Author(s):  
Barbara T. Smith ◽  
Tas D. Van Ommen ◽  
Mark A. J. Curran
Keyword(s):  
Diffusion Coefficient ◽  
Biological Activity ◽  
Sea Ice ◽  
Diffusion Mechanism ◽  
Ice Core ◽  
Ice Cores ◽  
East Antarctica ◽  
The Core ◽  
Central Value

AbstractMethanesulphonic acid (MSA) is an important trace-ion constituent in ice cores, with connections to biological activity and sea-ice distribution. Post-depositional movement of MSA has been documented in firn, and this study investigates movement in solid ice by measuring variations in MSA distribution across several horizontal sections from an ice core after 14.5 years storage. The core used is from below the bubble close-off depth at Dome Summit South, Law Dome, East Antarctica. MSA concentration was studied at 3 and 0.5 cm resolution across the core widths. Its distribution was uniform through the core centres, but the outer 3 cm showed gradients in concentrations down to less than half of the central value at the core edge. This effect is consistent with diffusion to the surrounding air during its 14.5 year storage. The diffusion coefficient is calculated to be 2 ×10–13 m2 s–1, and the implications for the diffusion mechanism are discussed.

Analysis of Twisting Stiffness for a Multifiber Composite Layer

1974 ◽  
Vol 41 (3) ◽  
pp. 658-662 ◽  
Author(s):  
C. W. Bert ◽  
S. Chang
Keyword(s):  
Cross Section ◽  
Least Squares Method ◽  
Rectangular Cross Section ◽  
Torsional Rigidity ◽  
Composite Layer ◽  
Circular Cross Section ◽  
Relaxation Method ◽  
Fiber Composites ◽  
Numerical Results ◽  
Torsion Problem

The twisting stiffness of a rectangular cross section consisting of a single row of solid circular cross-section fibers embedded in a matrix is analyzed. The problem is formulated as a Dirichlet torsion problem of a multielement region and solved by the boundary-point least-squares method. Numerical results for a single-fiber square cross section compare favorably with previous relaxation-method results. New numerical results for three and five-fiber composites suggest that the torsional rigidity of a multifiber composite can be approximated from the torsional rigidities of single and three-fiber models.

scholarly journals Growth And Elasticity Of Output Of MSME In India

2020 ◽  
Author(s):  
SETAK PALAK ◽  
Sandhyarani Das
Keyword(s):  
Cross Section ◽  
Important Determinant ◽  
Productivity Analysis ◽  
Cross Section Data ◽  
Output Data ◽  
Section Data ◽  
The Core ◽  
Employment Elasticity ◽  
Douglas Production Function

Abstract This paper analyses the phenomenon of growth in India through the lens of employment elasticity. Investigative results are imitative for decompositions of both the level and change of combined employment elasticity in terms of sectoral elasticities, relative development and employment shares. Estimates of these decompositions are presented with employment and output data from related sources for both economies. In India, MSME sector was the key determinant of both the level and change of aggregate elasticity. In India, service is the most important determinant of the level, but manufacturing remains an important driver of changes in aggregate employment elasticity. The core objective of the present paper remains to analyse the growth and elasticity output relationship in this sector, so the study contains the productivity analysis of the MSME sector in India. This will unleash the role of the various inputs and output in production here. Extended Cobb Douglas Production Function has been utilised on the secondary, cross section data of MSMEs of India. Different variables like employment, Number of working enterprises, input, output and capital are selected to analyze their effects of MSMEs.

scholarly journals Neutron removal cross section as a measure of neutron skin

2010 ◽  
Vol 81 (4) ◽  
Author(s):  
D. Q. Fang ◽  
Y. G. Ma ◽  
X. Z. Cai ◽  
W. D. Tian ◽  
H. W. Wang
Keyword(s):  
Cross Section ◽  
Neutron Skin ◽  
Removal Cross Section

New Countries, Old Problems

2021 ◽  
pp. 52-73
Author(s):  
Benjamin Hoy
Keyword(s):  
Indigenous People ◽  
Private Property ◽  
Cultural Beliefs ◽  
Border Control ◽  
Sexual Morality ◽  
Relative Importance ◽  
Immigration Laws ◽  
The Core ◽  
Racial Background ◽  
The Family

Chapter 3 focuses on the Great Lakes in the 1860s and 1870s to argue that the border’s importance shifted in response to Reconstruction and Confederation. National consolidation encouraged each nation to rethink how African Americans, Indigenous people, immigrants, and settlers fit into each country. By dividing those who constituted the nation from those who threatened it, battles over belonging helped to usher in new immigration laws and extradition provisions. Debates over suffrage required each country to outline the core tenants of the socieities they intended to create. This forced them to weigh the relative importance of cultural beliefs, gendered norms, contract freedom, racial background, and private property against one another. In this uncertain environment, sexual morality, suffrage rights, citizenship, and ideas about the family created the terrace that border control grew from.

Determination of Xanthates, Dithiocarbamates, and Some Fungicides by Titration with Electrogenerated Iodine in Anhydrous Acetonitrile

1983 ◽  
Vol 66 (3) ◽  
pp. 646-650
Author(s):  
Dale D Clyde
Keyword(s):  
Dimethyl Sulfoxide ◽  
Cross Section ◽  
Relative Error ◽  
Potassium Iodide ◽  
Anhydrous Acetonitrile ◽  
Platinum Electrodes ◽  
Cell Compartment ◽  
End Point ◽  
Relative Errors

Abstract Xanthates, dithiocarbamates, and the fungicides maneb and zineb were determined by titration with electrogenerated iodine in anhydrous acetonitrile. The electrolyte was potassium iodide. The generating electrode was a platinum spiral (2.5 cm diameter, 2 mm cross section). The enclosed cell compartment was continuously flushed with dry nitrogen, and sample solutions (0.20-0.40 mL) were introduced by syringe. With the aid of 2 platinum electrodes, the end point was indicated amperometrically. Ten minutes was required for each determination. The compounds were determined at ≥5 μequiv. with relative errors of 0.21-9%. Precision is 0.60-5.7%. Thiourea, sulfur, and urea did not interfere, but thioacetamide did. Solutions of maneb and zineb in dimethyl sulfoxide are stable enough that μequiv. amounts of each compound can be determined with a relative error of 7% or less.

Structural-Acoustic Optimization of Sandwich Panels

2005 ◽  
Author(s):  
Francesco Franco ◽  
Kenneth A. Cunefare ◽  
Massimo Ruzzene
Keyword(s):  
Numerical Optimization ◽  
Composite Structures ◽  
Gradient Methods ◽  
Sandwich Panels ◽  
Relative Importance ◽  
Structural Elements ◽  
Acoustic Response ◽  
The Core ◽  
Design Flexibility ◽  
The Face

Sandwich panels, comprising face sheets enclosing a core, are increasingly common structural elements in a variety of applications, including aircraft fuselages and flight surfaces, vehicle panels, lightweight enclosures, and bulkheads. The design flexibility associated with such composite structures provides significant opportunities for tailoring the structure to the load and dynamic response requirements for the particular application. Design flexibility encompasses the details of the face sheets and the core. This paper deals with the numerical optimization of different sandwich configurations for the purposes of achieving reduced structural acoustic response. Laminated face sheets and core geometries, comprising honeycomb and truss-like structures, are considered. The relative importance of the mass and stiffening properties of the core and face sheets are discussed. The optimization work is carried out using commercial codes. Benefits and limits of using an optimization algorithm based on gradient methods are highlighted.

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