A Rigorous Procedure to Predict Coupled Carbonate and Sulfide Scales in Different Field Scenarios

2020 ◽  
Author(s):  
Giulia Ness ◽  
Kenneth S. Sorbie
Keyword(s):  
Rigorous Procedure

scholarly journals Assessing Housing Accessibility for Older Adults in Japan: A Content Validity Study

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 108-108
Author(s):  
Rumiko Tsuchiya-Ito ◽  
Björn Slaug ◽  
Tomonori Sano ◽  
Miki Tajima ◽  
Sakiko Itoh ◽  
...  
Keyword(s):  
Older Adults ◽  
Content Validity ◽  
Assessment Tool ◽  
Occupational Therapists ◽  
Building Design ◽  
Validity Study ◽  
Housing Enabler ◽  
Item List ◽  
Existing Housing ◽  
Rigorous Procedure

Abstract Scientifically validated tools to assess housing accessibility for older adults in Japan have been lacking. To address this, a rigorous procedure of adapting an existing housing assessment tool—the Housing Enabler, developed in Sweden—for valid use in Japan was conducted. The original tool was translated into the Japanese language, using established translation procedures. In the process, researchers checked the appropriateness of technical terms and adjusted specifications to be in accordance with Japanese standards. An expert panel approach was used to validate the content of the Japanese Housing Enabler. Thirteen certified occupational therapists, architects and care-managers (average experience=14.5 years) participated as experts in the content validity study. They rated each item with regard to relevance for assessing housing accessibility in Japan, on a scale from 1(=Not relevant) to 4(= Highly relevant). They suggested adjustments and additions that they found to be relevant to capture particularities of Japanese housing and building design. After individual ratings, the experts gathered for consensus discussions on suggested revisions of the item list. As a result, the number of items was substantially increased (from 161 to 283). A content validity index (CVI) was calculated for each item (i.e., the proportion of experts rating the relevance as at least 3). Using a recommended threshold of CVI ≥0.78, more than 90% of the items were considered relevant, thus supporting the content validity. However, the large amount of items might jeopardize the feasibility of the instrument. Further studies are needed to evaluate feasibility, criterion-related validity and aspects of reliability.

scholarly journals Determination of bearing capacity of shallow foundations without using superposition approximation

2003 ◽  
Vol 40 (2) ◽  
pp. 450-459 ◽  
Author(s):  
D Y Zhu ◽  
C F Lee ◽  
K T Law
Keyword(s):  
Bearing Capacity ◽  
Field Method ◽  
Ultimate Bearing Capacity ◽  
Shallow Foundation ◽  
Closed Form Expression ◽  
Safe Side ◽  
Superposition Approximation ◽  
Bearing Capacity Factor ◽  
Rigorous Procedure

The Terzaghi superposition assumption has been widely used to determine the bearing capacity of shallow footings. Although this assumption always errs on the safe side, a rigorous procedure to calculate the bearing capacity is still of engineering value. This paper presents such a procedure that is free from errors as a result of the superposition assumption. It demonstrates that the ultimate bearing capacity can be precisely expressed by the Terzaghi equation, except that the bearing capacity factor Nγ is dependent upon the surcharge ratio. A recently developed numerical method, i.e., the critical slip field method, is used to calculate the modification coefficient for modifying Nγ. It is found that this modification coefficient increases with the surcharge ratio at small values of surcharge ratio and then remains constant for large values of surcharge ratio. However, the errors invoked by the superposition assumption do not exceed 10%. On the basis of numerical calculations, a simple closed-form expression of the modification coefficient is proposed that yields the theoretically rigorous ultimate bearing capacity. In the later part of the paper, errors in bearing capacity calculations owing to the use of conventional procedures are analyzed. It is concluded that the continued use of conventional procedures is justified, but the inherent errors should not be neglected in assessing the performance of shallow foundations.Key words: shallow foundation, strip footing, ultimate bearing capacity, critical slip field.

scholarly journals FLUCTUATIONS, CORRELATIONS AND FINITE VOLUME EFFECTS IN HEAVY ION COLLISION

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2229-2234
Author(s):  
LUDWIK TURKO
Keyword(s):  
Finite Volume ◽  
Thermodynamic Limit ◽  
Heavy Ion ◽  
Higher Moments ◽  
Heavy Ion Collision ◽  
Canonical Distribution ◽  
Statistical Ensembles ◽  
Ion Collision ◽  
Rigorous Procedure ◽  
Grand Canonical

Finite volume corrections to higher moments are important observable quantities. They make possible to differentiate between different statistical ensembles even in the thermodynamic limit. It is shown that this property is a universal one. The classical grand canonical distribution is compared to the canonical distribution in the rigorous procedure of approaching the thermodynamic limit.

A blind chemist's approach to automated scientific information

1985 ◽  
Vol 63 (7) ◽  
pp. 1372-1373
Author(s):  
Jean-Pierre Cartier ◽  
Francine Paquin
Keyword(s):  
Scientific Information ◽  
Functional Method ◽  
Chemical Information ◽  
Computer Access ◽  
Dialog System ◽  
Rigorous Procedure

Computer access to chemical information by a blind chemist is made possible with a VersaBraille system (Braille Information Processor). The CAS database of the DIALOG system is used in this updating assay. Preliminary trials showed the need to establish a rigorous procedure to avoid loss of data. In this study, a functional method is suggested as a substratum to circumvent costly problems.

A rigorous procedure for combining molecular dynamics and Monte Carlo simulation algorithms

2000 ◽  
Vol 260 (1-2) ◽  
pp. 183-191 ◽  
Author(s):  
Laura J. LaBerge ◽  
John C. Tully
Keyword(s):  
Molecular Dynamics ◽  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Simulation Algorithms ◽  
Rigorous Procedure

Forecasting Exports and Imports: Introduction

1967 ◽  
Vol 42 ◽  
pp. 32-34 ◽  
Author(s):  
R. L. Major
Keyword(s):  
Recent Work ◽  
New Method ◽  
Short Term ◽  
Economic Forecasting ◽  
Industrial Countries ◽  
Rigorous Procedure

The National Institute is currently studying ways of improving its methods of short-term economic forecasting. The two articles which follow report on some of the recent work undertaken in two parts of the field, namely exports and imports.In the case of exports, our methods hitherto have been rather subjective. The first article is the account of a more rigorous procedure proposed for one part, though a very important one, of total exports of goods, namely exports of manufactures to industrial countries. Attempts to find procedures of analogous rigour for exports to primary producing countries have, so far, failed to throw up anything very useful. For imports, our procedure has for some time been rigorous, in the sense of making use of postulated econometric relationships. Thus the second article does not so much propose a new method as elaborate and modify existing methods in a way which may prove to be more satisfactory.

ENERGY-DEPENDENT MANY-BODY PERTURBATION THEORY: A ROAD TOWARDS A MANY-BODY-QED PROCEDURE

2007 ◽  
Vol 16 (04) ◽  
pp. 1221-1231 ◽  
Author(s):  
INGVAR LINDGREN ◽  
STEN SALOMONSON ◽  
DANIEL HEDENDAHL
Keyword(s):  
Perturbation Theory ◽  
Electron Correlation ◽  
Numerical Evaluation ◽  
Arbitrary Order ◽  
Coulomb Interactions ◽  
Many Body ◽  
Many Body Perturbation Theory ◽  
Qed Effects ◽  
Energy Dependent ◽  
Rigorous Procedure

A rigorous procedure for energy-dependent many-body perturbation theory (MBPT) is presented. This can be applied for numerical evaluation of many-body-QED effects by combining QED with electron correlation to arbitrary order. So far, it has been used only for the exchange of a single retarded photon together with an arbitrary number of instantaneous Coulomb interactions. For heliumlike neon this represents more than 99% of the nonradiative effect on the energy beyond standard MBPT.

Is That Interference? A Work Flow for Identifying and Analyzing Communication Through Hydraulic Fractures in a Multiwell Pad

SPE Journal ◽  
2016 ◽  
Vol 21 (05) ◽  
pp. 1554-1566 ◽  
Author(s):  
A.. Awada ◽  
M.. Santo ◽  
D.. Lougheed ◽  
D.. Xu ◽  
C.. Virues
Keyword(s):  
Numerical Models ◽  
Work Flow ◽  
Hydraulic Fractures ◽  
Use Of Data ◽  
Well Spacing ◽  
Production Scheme ◽  
Fracture Fluid ◽  
Fluid Production ◽  
Horn River Basin ◽  
Rigorous Procedure

Summary The topic of interwell communication in unconventional reservoirs has received significant attention because it has direct implications for well-spacing considerations. However, it has been the observation of the authors that interference is often inferred without direct evidence of its occurrence, or without an understanding of the various mechanisms of interference. Some common discussions on interference among engineers refer to fracture “hits” and fracture-fluid production that suddenly appears at offset producing wells. These are indications of communication, but do not necessarily imply that a strong connection will be maintained throughout the life of the wells. This paper presents a rigorous procedure for correctly identifying interference by use of data acquired during a typical multiwell-pad-production scheme. First, the various mechanisms of interference are defined. Next, analytical simulations are run to reveal the expected behavior for interference through fractures and reservoir matrix. Data provided from an eight-well pad in the Horn River basin are then scoured, revealing evidence of interference between at least two wells. Through this exercise, a procedure is developed for identifying interference by searching for changes in buildup trends while wells are staggered on/off production. Finally, the data are history matched with numerical models to confirm the interference mechanism. The procedure in this paper is designed to help production analysts diagnose interference and avoid common pitfalls. The work flow is generalized and can be applied to other multiwell-pad completions.

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