scholarly journals A comparative assessment and unification of bond models in DEM simulations

2021 ◽  
Vol 24 (1) ◽  
Author(s):  
Xizhong Chen ◽  
Di Peng ◽  
John P. Morrissey ◽  
Jin Y. Ooi
Keyword(s):  
Comparative Evaluation ◽  
Contact Point ◽  
Comparative Assessment ◽  
Point Location ◽  
Dem Simulations ◽  
Bond Model ◽  
Bonded Particles ◽  
Contact Models ◽  
Beam Bending ◽  
Similarities And Differences

AbstractBonded contact models have been increasingly used in the discrete element method (DEM) to study cemented and sintered particulate materials in recent years. Several popular DEM bond models have been proposed in the literature; thus it is beneficial to assess the similarities and differences between the different bond models before they are used in simulations. This paper identifies and discusses two fundamental types of bond models: the Spring Bond Model where two bonded particles are joined by a set of uniform elastic springs on the bond’s cross-section, and the Beam Bond Model in which a beam is used to connect the centres of two particles. A series of cantilever beam bending simulation cases were carried out to verify the findings and assess the strength and weakness of the bond models. Despite the numerous bond models described in the literature, they can all be considered as a variation of these two fundamental model types. The comparative evaluation in this paper also shows that all the bond models investigated can be unified to a general form given at a predefined contact point location.

COMPARATIVE EVALUATION OF GUT DECOMPRESSION METHODS IN OPERATIONS ON TOXIC WIDESPREAD PERITONITIS

2019 ◽  
pp. 34-37
Author(s):  
V.I. Midlenko ◽  
N.I. Belonogov ◽  
O.V. Midlenko ◽  
A.L. Charyshkin
Keyword(s):  
Small Intestine ◽  
Treatment Outcomes ◽  
Comparative Evaluation ◽  
Comparative Assessment ◽  
Abdominal Pressure ◽  
Treatment Results ◽  
Intestinal Decompression ◽  
Bowel Decompression

The aim of the paper is to conduct a comparative assessment of bowel decompression methods in operations on toxic widespread peritonitis. Materials and Methods. The authors examined 162 patients with widespread peritonitis of various etiologies. Using generally accepted methods, they compared treatment results using one of the three methods of intestinal decompression: cecostomy, nasointestinal intubation, and cecostomy with intubation of the small intestine. Results. It was detected that in case of small intestine intubation through the cecostomy (in comparison with other methods), intra-abdominal pressure returned to normal on the 2nd day, and in case of cecostomy or nasointestinal intubation – on the 5th and 7th day, respectively. Also, decrease in intoxication indicators was observed 2 days earlier than usual. Conclusion. Intubation of the small intestine through the cecostoma provides the most adequate intestinal decompression in patients with advanced toxic peritonitis. Early normalization of intra-abdominal pressure in patients with advanced toxic peritonitis improves treatment outcomes. Keywords: widespread peritonitis, intestinal decompression. Цель – сравнительная оценка способов декомпрессии кишечника при операциях по поводу распространённого перитонита в токсической стадии. Материалы и методы. Наблюдали 162 пациента с распространённым перитонитом различной этиологии. С использованием общепринятых методик сравнивались результаты лечения при применении одного из трёх способов декомпрессии кишечника: цекостомии, назоинтестинальной интубации и наложения цекостомы с интубацией тонкой кишки. Результаты. Установлено, что при использовании интубации тонкого кишечника через цекостому, в сравнении с другими применявшимися нами способами, внутрибрюшное давление нормализовалось на второй день, а при использовании цекостомии или назоинтестинальной интубации – на 5-й и 7-й дни соответственно. Также на 2 сут раньше происходило снижение показателей интоксикации. Выводы. Наиболее адекватную декомпрессию кишечника у пациентов с распространённым перитонитом в токсической стадии обеспечивает интубация тонкого кишечника через цекостому. Ранняя нормализация внутрибрюшного давления у пациентов с распространённым перитонитом в токсической стадии позволяет улучшить результаты лечения. Ключевые слова: распространённый перитонит, декомпрессия кишечника.

scholarly journals Traditional Brands vs. On-Line Brands: A Comparative Assessment

2011 ◽  
Vol 2 (10) ◽  
Author(s):  
Elizabeth Aderton ◽  
Shiva Nandan
Keyword(s):  
Comparative Assessment ◽  
Font Size ◽  
Technological Environment ◽  
Branding Strategies ◽  
The Future ◽  
On Line ◽  
Similarities And Differences ◽  
Compare And Contrast

<p class="MsoNormal" style="text-align: justify; margin: 0in 0.5in 0pt;"><span style="font-size: 10pt; mso-bidi-font-style: italic; mso-bidi-font-size: 12.0pt;"><span style="font-family: Times New Roman;">In this paper we compare and contrast the branding strategies of traditional and on-line companies. To illustrate the similarities and differences between the two, we examine four well-established traditional brands and four successful on-line brands.<span style="mso-spacerun: yes;">&nbsp; </span>We then offer recommendations for successful branding in the ever-evolving business and technological environment of the future.</span></span></p>

Comparative Evaluation Of Efficiency Of Proton Pomp Inhibitors Of The First And Second Generations In Treating Gastroesophageal Reflux Disease

2011 ◽  
Vol 2 ◽  
Author(s):  
Mirvasit Karimov ◽  
Abdujabar Akhmatkhodjaev
Keyword(s):  
Gastroesophageal Reflux Disease ◽  
Gastroesophageal Reflux ◽  
Reflux Disease ◽  
Clinical Remission ◽  
Comparative Evaluation ◽  
Comparative Assessment ◽  
Esophageal Mucosa ◽  
Clinical Efficiency ◽  
Clinical Investigations

Comparative assessment of clinical efficiency of omeprazole and rabeprazole in treating gastroesophageal reflux disease (GERD). 65 patients with a verified diagnosis GERD were examined. Comparative clinical investigations of using ofomeprazole and rabeprazole have revealed effectiveness of both drugs in the therapy of GERD. However, rabeprazoleshowed antisecretory action in the earlier periods, providing stable clinical remission of GERD and early scarring of erosivelesions of the esophageal mucosa, compared with omeprazole

scholarly journals Performance-Based Comparative Assessment of Open Source Web Vulnerability Scanners

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Mansour Alsaleh ◽  
Noura Alomar ◽  
Monirah Alshreef ◽  
Abdulrahman Alarifi ◽  
AbdulMalik Al-Salman
Keyword(s):  
Open Source ◽  
Comparative Evaluation ◽  
Dynamic Testing ◽  
Comparative Assessment ◽  
Multiple Perspectives ◽  
Vulnerability Detection ◽  
Significant Performance ◽  
High Level ◽  
Level Of Agreement

The widespread adoption of web vulnerability scanners and the differences in the functionality provided by these tool-based vulnerability detection approaches increase the demand for testing their detection effectiveness. Despite the advantages of dynamic testing approaches, the literature lacks studies that systematically evaluate the performance of open source web vulnerability scanners. The main objectives of this study are to assess the performance of open source scanners from multiple perspectives and to examine their detection capability. This paper presents the results of a comparative evaluation of the security features as well as the performance of four web vulnerability detection tools. We followed this comparative assessment with a case study in which we evaluate the level of agreement between the results reported by two open source web vulnerability scanners. Given that the results of our comparative evaluation did not show significant performance differences among the scanners while the results of the conducted case study revealed high level of disagreement between the reports generated by different scanners, we conclude that the inconsistencies between the reports generated by different scanners might not necessarily correlate with their performance properties. We also present some recommendations for helping developers of web vulnerabilities scanners to improve their tools’ capabilities.

scholarly journals INPRO Activities on Development of Advanced Tools to Support Judgment Aggregation for Comparative Evaluation of Nuclear Energy Systems

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
V. Kuznetsov ◽  
G. Fesenko ◽  
A. Andrianov ◽  
I. Kuptsov
Keyword(s):  
Decision Analysis ◽  
Comparative Evaluation ◽  
Nuclear Energy ◽  
Energy Systems ◽  
Judgment Aggregation ◽  
Comparative Assessment ◽  
Multicriteria Decision Analysis ◽  
Collaborative Project ◽  
Multicriteria Decision ◽  
Key Indicators

This paper presents first results of the INPRO Collaborative Project on Key Indicators for Innovative Nuclear Energy Systems, which has the objective to develop guidance and tools for comparative evaluation of the status, prospects, benefits, and risks associated with development of innovative nuclear technologies for a more distant future. Presented results illustrate expedience of application of the multicriteria decision analysis methods, which are able to provide the added value to comparative assessment of nuclear energy systems. First, the paper presents a short review of the multicriteria decision analysis methods appropriate to support judgment aggregation within comparative evaluations of nuclear energy systems based on key indicators and highlights the methodology to perform such assessments. Second, a set of key indicators elaborated in the INPRO Collaborative Project on Global Architecture of Innovative Nuclear Energy Systems Based on Thermal and Fast Reactors Including a Closed Fuel Cycle (GAINS) were evaluated for comparative evaluation of nuclear energy system evolution scenarios. Third, a numerical example is presented of application of the selected key indicators, methods, and tools for judgment aggregation in comparative assessment of the GAINS nuclear energy systems.

scholarly journals Morphological comparative assessment of in vivo 2-week oral exposure of silver nanoparticles and silver sulfate on the mice liver

2019 ◽  
Vol 95 (9) ◽  
pp. 899-902
Author(s):  
Natalia N. Belyaeva ◽  
L. P. Sycheva
Keyword(s):  
Silver Nanoparticles ◽  
Comparative Evaluation ◽  
Comparative Assessment ◽  
Oral Exposure ◽  
Silver Sulfate ◽  
Mice Liver ◽  
The Impact ◽  
Functional Indices ◽  
Different Doses

Currently the problem of the impact of nanoparticles and nanomaterials on human health remains to be poorly understood. As in our studies of the impact of silver nanoparticles on rats liver as well in works of other researchers there were investigated morphofunctional indices under peroral exposure. Although all researchers took different sizes, doses and concentrations of silver nanoparticles, various exposure time and different stabilizers, the same effects had been obtained, which, however, were occurred under both different doses and time of exposure. However, it was interesting to compare the impact of silver nanoparticles with reference substance - silver sulfate on the mice liver with the previously evaluated effect produced on the rats ’ liver. By ourselves there was executed the morphological comparative evaluation of in vivo oral 2-weeks exposure of 4 concentrations (0.1; 5; 50 and 500 mg/l) of silver nanoparticles with size of 14 nm, stable arabian gum 1:7 by weight, and of 4 similar concentrations of silver sulfate on the liver of male mice СВАхС57В1/6 weighing 25-35g. 2 groups were considered as control: intact mice and mice received gum in water. Results of the exposure were assessed according to 10 morphological and functional indices. The impact of nanosilver was shown to initiate from its concentration of 50 mg/l and to express in the gain of the index of alteration of the cytoplasm of hepatocytes with the increasing in both severity of steatosis and the number of micronecroses, persisting at the same level at concentrations of 500 mg/l and with the elevation of the index of alteration of nuclei of hepatocytes, while the similar effect develops under the influence of silver sulfate at a concentration of 500 mg/l only. The remaining investigated morphofunctional indices did not differ significantly in all groups of mice. Unlike previously executed studies on rats, mice appeared to be sensitive to the effects of nano-silver more than to silver sulfate.

scholarly journals A Comparison of Ansys Fluent and MFiX in Performing CFD-DEM Simulations of a Spouted Bed

Fluids ◽  
2021 ◽  
Vol 6 (11) ◽  
pp. 382
Author(s):  
Filippo Marchelli ◽  
Renzo Di Felice
Keyword(s):  
Lift Force ◽  
Particle Systems ◽  
Fluid Particle ◽  
The Other ◽  
Spouted Bed ◽  
Ansys Fluent ◽  
Drag Model ◽  
Dem Simulations ◽  
Similarities And Differences ◽  
Selection Of

The CFD-DEM methodology is a popular tool for the study of fluid–particle systems, and there are several programs that permit using it. In this study, we employed it to simulate a pseudo-2D spouted bed, comparing the performance of the programs Ansys Fluent and MFiX. The results are analysed and commented on in terms of both accuracy and computational efforts. Despite the similarity of the setup, MFiX seems to perform significantly better. The similarities and differences between the two programs are discussed in detail, offering useful insights to researchers regarding the selection of one over the other, depending on the application. The better suitability of the Di Felice drag model is confirmed for the device, while it is shown that the effect of the Magnus lift force may be more limited than was shown in a previous study.

Comparative assessment of the quadriceps and the diaphragm in patients with COPD

2009 ◽  
Vol 107 (3) ◽  
pp. 952-961 ◽  
Author(s):  
Marc-André Caron ◽  
Richard Debigaré ◽  
P. N. Richard Dekhuijzen ◽  
François Maltais
Keyword(s):  
Oxidative Stress ◽  
Skeletal Muscles ◽  
Phenotypic Expression ◽  
Respiratory Muscles ◽  
Comparative Assessment ◽  
Chronic Obstructive ◽  
Obstructive Pulmonary Disease ◽  
Systemic Factors ◽  
Similarities And Differences ◽  
Muscle Changes

Chronic obstructive pulmonary disease (COPD) and other chronic diseases such as heart failure are accompanied by skeletal muscle alterations that further enhance morbidity and mortality in affected individuals. Several studies have highlighted important structural and biochemical modifications in limb and respiratory muscles in COPD. Reviewing the similarities and differences between the two most studied muscles in COPD, the quadriceps and the diaphragm, may be helpful in providing important clues about the mechanisms underlying muscle changes associated with this disease. Although oxidative stress is present in both muscles, other muscle alterations are clearly distinct between the quadriceps and the diaphragm. For example, the oxidative metabolism varies in opposite directions, the diaphragm exhibiting increased resistance to fatigue while the quadriceps in COPD is characterized by premature fatigability. Differences in muscle phenotypic expression between the diaphragm and the quadriceps indicate that, in addition to systemic factors, the local microenvironment must participate in the reorganization seen in these two skeletal muscles in COPD.

COMPARATIVE EVALUATION OF THE NATIONAL ECONOMY SECURITY LEVEL UNDER CONDITIONS OF VIRAL INFECTION DISEASE: METHODOLOGY FOR EVALUATION

2020 ◽  
Vol 2 (7) ◽  
pp. 130-140
Author(s):  
D. V. GORDIENKO ◽  
Keyword(s):  
Viral Infection ◽  
National Economy ◽  
Comparative Evaluation ◽  
Political Leadership ◽  
Economic Security ◽  
Comparative Assessment ◽  
The Political ◽  
Security Level ◽  
Infection Disease ◽  
Coronavirus Infection

The paper considers indicators and criteria for assessing the level of protection of the national economy in the context of the spread of viral infection. An approach to determining the significance of standardized indicators of economic security of the state for various stages of the spread of viral infection is presented. An approach to the comparative assessment of the level of protection of the national economy in the context of the spread of viral infection for the States of the strategic triangle Russia – China – USA is proposed. This allows us to identify the priorities of Russia's economic policy and justify recommendations to the political leadership of our country to combat COVID-19 coronavirus infection.

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