bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of Starch Characteristics on the Pasting Properties of Potato Flours Prepared from Yellow-fleshed Potatoes
Authors: Chun Ik-Jo , Kim Hyun-Seok
Published: December 2014

The objective of this study was to determine the potato starch characteristics acting as major factors directly affecting the pasting viscosity characteristics of potato flours. Potato flours were prepared by freeze-drying, and in turn, pulverizing the whole-tissues from six varieties of yellow-fleshed potatoes, followed by the isolation of potato starches from potato flours. Potato flours were analyzed for proximate compositions, and pasting viscosities. Potato starches were investigated for chemical compositions (total starch, damaged starch, apparent amylose, phosphorus), average granule size, X-ray diffraction pattern, amylopectin branch-chain distribution, swelling factor, gelatinization, and pasting viscosity. The pasting viscosity characteristics of potato flours were correlated to potato starch characteristics using Pearson’s correlation. Amylose contents from colorimetric and IPSEC methods were negatively correlated to the peak viscosity of potato flours. Both phosphorus content and swelling factors were strongly correlated to the trough, breakdown, final, and setback viscosities of potato flours. Also, the amylopectin short branch-chain distributions and final viscosities of potato starches were strongly correlated to the pasting viscosity characteristics of potato flours. Overall, the phosphorus content, amylopectin short branch-chain proportion, and final viscosity of potato starches could be major factors to estimate the pasting viscosity characteristics of yellow-fleshed potato flours.
Indoor place categorization based on adaptive partitioning of texture histograms
Authors: Eberhardt Sven
Published: December 2014

How can we localize ourselves within a building solely using visual information, i.e., when no data about prior location or movement are available? Here, we define place categorization as a set of three distinct image classification tasks for view matching, location matching, and room matching. We present a novel image descriptor built on texture statistics and dynamic image partitioning that can be used to solve all tested place classification tasks. We benchmark the descriptor by assessing performance of regularization on our own dataset as well as the established Indoor Environment under Changing conditionS dataset, which varies lighting condition, location, and viewing angle on photos taken within an office building. We show improvement on both the datasets against a number of baseline algorithms.
Postpartum diagnosis of a spontaneous rupture of an unscarred uterus with expulsion of omentum vaginally
Authors: Atis Alev , Acar Deniz , Alpay Verda , Atalay Aysegul , Yüceer Aydan
Published: December 2014

Spontaneous rupture of an unscarred uterus is an obstetrical emergency. Its diagnosis is often concealed, leading to maternal and foetal mortality. Many risk factors and clinical presentations have been identified. In this case report, we describe postpartum diagnosed uterine rupture in a multigravid woman with a very rare presentation of vaginal omental expression and discuss appropriate management of this presentation.
Influence of silver nanoparticles on post-surgical wound healing following topical application
Authors: Chowdhury Sushovan , De Munmun , Guha Rajdeep , Batabyal Subhasis , Samanta Indranil , Hazra Samir Kumar , Ghosh Tamal Kanti , Konar Aditya , Hazra Sarbani
Published: December 2014

Prevention of surgical site infection and wound dehiscence are imperative and also challenging in clinical practice. This study examines the healing response of laparotomy wounds following application of silver nanoparticles.

Dermal fibroblasts were exposed to incremential doses of silver nanoparticles and its effect on collagen synthesis and cytotoxicity was assessed. Laparotomy surgery was performed on rabbits and the operation site was treated topically either with silver nanoparticle once, or once daily for 14 days or with vehicle. Healing response and local tissue reaction was evaluated clinically by histopathology and scanning electron microscopy (SEM); microbial load on the operation site was assessed. Clinical tests and histopathology were performed to assess systemic toxicity.

Silver nanoparticles increased collagen expression from dermal fibroblasts and longer time exposure increased caspase 3 expression and produced cyotoxic effect with an IC50 of 0.16 mg/mL. Daily treatment of operation sites resulted in increased collagen deposition and improved wound healing, microbial load was reduced. Although a sub dermal edema was evident in histopathology, SEM showed normal architecture of cells with infiltration of lymphocytes. There was no systemic toxicity.

Silver nanoparticles exhibit a positive influence on wound healing but its effect on local tissue remains a concern.
Study on Effective Radial Thermal Conductivity of Gas Flow through a Methanol Reactor
Authors: Lei Kun , Ma Hongfang , Zhang Haitao , Ying Weiyong , Fang Dingye
Published: December 2014

The heat conduction performance of the methanol synthesis reactor is significant for the development of large-scale methanol production. The present work has measured the temperature distribution in the fixed bed at air volumetric flow rate 2.4–7 m3 · h−1, inlet air temperature 160–200°C and heating tube temperature 210–270°C. The effective radial thermal conductivity and effective wall heat transfer coefficient were derived based on the steady-state measurements and the two-dimensional heat transfer model. A correlation was proposed based on the experimental data, which related well the Nusselt number and the effective radial thermal conductivity to the particle Reynolds number ranging from 59.2 to 175.8. The heat transfer model combined with the correlation was used to calculate the temperature profiles. A comparison with the predicated temperature and the measurements was illustrated and the results showed that the predication agreed very well with the experimental results. All the absolute values of the relative errors were less than 10%, and the model was veriﬁed by experiments. Comparing the correlations of both this work with previously published showed that there are considerable discrepancies among them due to different experimental conditions. The influence of the particle Reynolds number on the temperature distribution inside the bed was also discussed and it was shown that improving particle Reynolds number contributed to enhance heat transfer in the fixed bed.
Der Compliance Officer – Aufgaben und Anforderungen
Authors: Heuking Christian
Published: December 2014

Die Aufgaben des Compliance-Officers sind vielfältig. Der Artikel gibt einen Überblick zu den Aufgaben und zur Rolle des Compliance-Officers im Unternehmen. Zudem werden die Anforderungen an ihn dargestellt, ebenso die Kriterien für die Entscheidung zu einer internen oder externen Lösung.
Human Skin Color Detection Using Neural Networks
Authors: Hajiarbabi Mohammadreza , Agah Arvin
Published: December 2014

Human skin detection is an essential phase in face detection and face recognition when using color images. Skin detection is very challenging because of the differences in illumination, differences in photos taken using an assortment of cameras with their own characteristics, range of skin colors due to different ethnicities, and other variations. Numerous methods have been used for human skin color detection, including the Gaussian model, rule-based methods, and artificial neural networks. In this article, we introduce a novel technique of using the neural network to enhance the capabilities of skin detection. Several different entities were used as inputs of a neural network, and the pros and cons of different color spaces are discussed. Also, a vector was used as the input to the neural network that contains information from three different color spaces. The comparison of the proposed technique with existing methods in this domain illustrates the effectiveness and accuracy of the proposed approach. Tests were done on two databases, and the results show that the neural network has better precision and accuracy rate, as well as comparable recall and specificity, compared with other methods.
Law and Development Implications of Transnational Land Acquisitions: Introduction
Authors: Neef Andreas
Published: December 2014

This introductory article to the 2014 Special Issue of
Unexpected Links between Baby Markets and Intergenerational Justice
Authors: Ertman Martha M.
Published: December 2014

Intergenerational justice does not require increased government regulation of reproductive technologies in the United States. Arguments tarring reproductive technologies as unnatural or immoral fail to withstand close scrutiny, and moreover ignore competing moral concerns like the liberty and equality of people to form families in different ways, as well as the interests of children born via assisted reproduction in having their families recognized just as coitally conceived children’s families are recognized. Embryo markets, in contrast, might present different challenges, requiring a separate analysis of their potential impact on intergenerational justice.
Intergenerational Justice and the “Hereditary Principle”
Authors: Penner J.E.
Published: December 2014

Is it possible to justify the passing of property rights from one generation to the next, and the acquisition of citizenship rights, on the basis of inheritance? This paper raises two considerations which indicate that typical luck egalitarian arguments against the operation of any “hereditary principle” in the intergenerational succession of economic and political rights are not conclusive. Both considerations concern autonomy. The concept of inheritance can be seen to be justified when the social connectedness of individuals is appreciated – inheritance reflects the embeddedness of individuals in the lives and projects of others both in the past and in the future. So while there may be good liberal reasons to reject inheritance as a mode of property succession, for example that it might perpetuate or initiate unequal distributions, these do not begin to suggest that nothing can be said in its favor, morally speaking, if the autonomy of individuals is understood to be situated in particular social structures. A similar case can be made for the claim that rights to citizenship are best seen as reflecting a “duty to govern”; those most embedded in the life-ways of a community would appear to be best placed to shoulder this duty. Finally, the paper considers an argument from “familiarity,” which suggests that it is not wrong to favor to some extent individuals whose genetic and cultural characteristics reflect one’s own, and concludes that such a consideration can play a role in justifying to some extent the justification of a “hereditary principle.”
Ehre, Schwerter und das Recht. Zweikämpfe im alten Island
Authors: Wetzler Sixt
Published: December 2014

In medieval Europe, ritualized forms of duelling were not restricted to the continent’s central regions. The North Germanic areas had developed similar practices. The best source material for the phenomenon stems from Iceland. After a short introduction to the peculiarities of the early Icelandic political system, this article will briefly discuss the possibilities and problems of a scientific approach towards the history of Iceland’s first centuries. Then, after an outline of the dominant concepts of personal and family honour and fortune at this time, the paper’s main part will provide insight into specific Old Icelandic forms of duelling – especially the
Selectivity of lipases for estolides synthesis
Authors: Todea Anamaria , Otten Linda G. , Frissen August E. , Arends Isabel W.C.E. , Peter Francisc , Boeriu Carmen G.
Published: December 2014

Lipase-catalyzed synthesis of estolides starting from different saturated (C16 16OH, C18 12OH) and unsaturated (C18:1 9 cis 12-OH) hydroxy-fatty acids was investigated. For this reason, the catalytic efficiency of several native and immobilized lipases in different organic reaction media at temperatures up to 75 °C was studied. The formation of mono- and di-lactone as well as estolide’s chain elongation depends on the type and source of lipase. The lipase from Pseudomonas stutzeri immobilized by cross-linking as cross-linked enzymes aggregates (CLEAs) was the best biocatalyst in terms of chain elongation. Estolides with polymerization degree up to 10 were obtained at substrate conversions higher than 80 %.
The Late Neolithic Michelsberg culture – just ramparts and ditches? A supraregional comparison of agricultural and environmental data
Authors: Kreuz Angela , Märkle Tanja , Marinova Elena , Rösch Manfred , Schäfer Eva , Schamuhn Silke , Zerl Tanja
Published: December 2014

Der archäobotanische Forschungsstand zur Michelsberger und zur Bischheimer Kultur (5./4. Jahrtausend BC) wurde zusammengetragen und in Zusammenhang mit archäologischen, klimatologischen und biologischen Daten diskutiert. Verglichen mit Bischheim und dem Mittelneolithikum hat die Michelsberger Kultur ein reduziertes Kulturpflanzenspektrum genutzt, mit einem Schwerpunkt bei Getreideanbau. Die Herkunft des tetraploiden Nacktweizens konnte dabei noch nicht abschließend geklärt werden. Möglicherweise wurde der Anbau von Öl-/Faserpflanzen aufgegeben. Dieses reduzierte Michelsberger Spektrum findet sich interessanterweise etwas später analog im Verbreitungsgebiet der Trichterbecherkultur und bei den neolithischen Fundstellen auf den britischen Inseln. Klimatische Ursachen sind dafür wohl nicht als ursächlich anzusehen. Stattdessen könnte es sich nach den vegetationsgeschichtlichen und archäozoologischen Ergebnissen um eine kulturelle Entscheidung zu einem Landwirtschaftssystem mit Schwerpunkt bei der Viehzucht handeln.

Les données carpologiques issues des sites de la culture Michelsberg et du complexe culturel de Bischheim (5

The archaeobotanical state of research from sites of the Michelsberg and the Bischheim culture (5
Touchstones and mercury at Hedeby
Authors: Ježek Martin , Holub Milan
Published: December 2014

Im Beitrag werden wikingerzeitliche, als Grabbeigaben überlieferte Steinartefakte – Probiersteine – aus Haithabu behandelt. Chemische Mikroanalysen der Steinoberflächen wurden durchgeführt und Spuren von Metall entdeckt. Dabei handelt es sich um auch andernorts auf Probiersteinen identifizierte Metalle, es fanden sich jedoch auch Hinweise, die auf Amalgamierung des Messings deuten, was als Fingerzeig für die Verwendung von Quecksilber gewertet wird.

Dans cet article nous considérons une sélection d’objets de pierre provenant de sépultures du site de Hedeby, datant de l’époque viking. Nous présentons les résultats d’analyses microchimiques effectuées sur les traces de métal retrouvées à la surface de ces objets. Mis à part les métaux qui ont régulièrement été identifiés sur les pierres de touche, un objet a également révélé des indices d’un amalgame de laiton. Ainsi nous nous penchons aussi sur la question de la présence du mercure à Hedeby.

This article considers selected stone artefacts from graves at the Viking Age site of Hedeby. It aims to present the results of chemical microanalyses of metal traces preserved on their surface. Besides the metals that were regularly identified on touchstones, one artefact showed signs of a brass amalgam. For this reason the authors also examine the question of the occurrence of mercury at Hedeby.
Meteorology I.3 340b6–10: An ambiguous passage
Authors: Baksa István
Published: December 2014

Aristotle’s cosmology divides his finite, spherical universe into two main parts: the sublunary and the supralunary world. The former reaches from the middle of the Earth to the sphere of the Moon and is a domain of constant change, as the four sublunary elements, earth, water, air and fire endlessly change into one another. The latter starts with the sphere of the Moon and ends at the edge of the cosmos, that is, with the sphere of the fixed stars. There is only one element in this realm, the one that Aristotle calls the “first element” – an unchangeable, imperishable principle that guarantees the everlasting motion of heavenly bodies.

There is, however, a short passage in the
A nonparametric model for spot price dynamics and pricing of futures contracts in electricity markets
Authors: Ignatieva Katja
Published: December 2014

This paper deals with the estimation of continuous time diffusion processes describing the dynamics of electricity spot prices. Different parametric models have been proposed in the literature, each attempting to capture empirical characteristics and stylized facts of the electricity market like the spiky behavior of the spot prices. Although jump-diffusion and regime-switching models perform reasonably well, there is always a trade-off between model parsimony and adequacy. The results in the literature indicate that none of the models seem to consistently outperform its counterparts. This paper avoids making parametric assumption about the drift and the diffusion coefficient functions of the underlying electricity spot prices, and estimates these functions together with the market price of risk in a nonparametric way. The latter allows us to price futures contracts written on electricity spots. Using electricity spot prices and futures data from the regional electricity markets in Australia, we show that besides offering a convenient way of estimating the continuous-time models for electricity spot prices, our nonparametric estimation procedure performs well in- and out-of-sample when dealing with pricing of future contracts.
Estimating dynamic copula dependence using intraday data
Authors: Grossmass Lidan , Poon Ser-Huang
Published: December 2014

We estimate the dynamic daily dependence between assets by applying the Semiparametric Copula-Based Multivariate Dynamic (SCOMDY) model on intraday data. Using tick data of three stock returns of the period before and during the credit crisis, we find that our dependence estimator better captures the steep increase in dependence during the onset of the crisis as compared to other commonly used time-varying copula methods. Like other high-frequency estimators, we find that the dependence estimator exhibits long memory and forecast it using a HAR model. We show that for out-of-sample forecasts, our dependence estimator performs better than the constant estimator and other commonly used time-varying copula dependence estimators.
Joseph, Jehoiachin, and Cyrus: On Book Endings, Exoduses and Exiles, and Yehudite/Judean Social Remembering
Authors: Wilson Ian Douglas
Published: December 2014

In a recent ZAW article, Michael Chan argues that II Reg 25,27–30 alludes to Gen 40–41, and that this allusion provides a hermeneutical key for understanding the purpose of II Reg 25,27–30 in an Enneateuchal context: it points to an imminent exodus, a return from exile and a gathering of diaspora in the promised land. This article picks up where Chan left off, in order to flesh out some of the implications of his contribution. It argues that remembering exodus at the end of II Reg included hope, as Chan says, but also struggles and failure, punishment and death. Exodus is multivocal. Likewise, the end of II Reg contributes to a multivocal discourse concerning Davidic kingship, which included the end of Chronicles and prophetic literature. The diminution of Davidic kingship in II Reg 25,27–30 is balanced by other perspectives. The article concludes with an observation on the import of this multivocality for Yehudite social memory.

Dans un article récent de la ZAW, Michael Chan tente d’établir que II Rois 25,27–30 fait allusion à Gen. 40–41, et que cette relation offre une clé herméneutique pour la compréhension de cette péricope dans le contexte de l’Ennéateuque: celle-ci renvoie à un exode imminent, un retour de l’exil et un rassemblement de la diaspora en terre promise. Cette étude prend le relais de celle de Chan, afin d’élucider certaines implications de sa contribution. L’A. soutient que l’évocation de l’Exode à la fin de II Rois inclut l’espérance (comme Chan le dit), mais aussi les combats et les échecs, la punition et la mort. L’exode est polysémique. De la même manière, la fin de II Rois contribue à un discours polyvalent sur la royauté de David, auquel participent aussi la fin des Chroniques et la littérature prophétique. L’amoindrissement de la royauté davidique en II Rois 25,27–30 est compensé par d’autres perspectives. On note enfin l’importance de cette polysémie pour la mémoire collective de Juda.

In einem aktuellen ZAW-Aufsatz argumentiert Michael Chan, dass II Reg 25,27–30 auf Gen 40–41 anspielt, und dass diese Anspielung einen hermeneutischen Schlüssel für das Verständnis von II Reg 25,27–30 im Kontext des Enneateuch bereitstellt: Diese verweist auf einen nahe bevorstehenden Exodus, eine Rückkehr aus dem Exil und eine Sammlung der Diaspora im verheißenen Land. Dieser Artikel beginnt dort, wo Chan aufgehört hat, um einige der Konsequenzen seines Beitrags zu verdeutlichen. Es wird argumentiert, dass die Erinnerung an den Exodus am Ende von II Reg Hoffnung einschließt, wie Chan sagt, aber auch Kämpfe und Scheitern, Strafe und Tod. Der Exodus ist mehrdeutig. In ähnlicher Weise trägt das Ende von II Reg zu einem vielstimmigen Diskurs über das davidische Königtum bei, zu dem auch das Ende der Chronik und die prophetische Literatur gehören. Die Verkleinerung des davidischen Königtums in II Reg 25,27–30 wird durch andere Perspektiven ausbalanciert. Der Artikel schließt mit einer Beobachtung über die Bedeutung dieser Vielstimmigkeit für das kollektive Gedächtnis Jehuds.
The meaning of todah in the title of Psalm 100
Authors: Amzallag Nissim
Published: December 2014

The mention of

La mention de

Die Erwähnung von

Dagegen wird hier, angesichts der Verwendung von
The Dual Role of Historiography in Psalm 106: Justifying the Present Distress and Demonstrating the Individual’s Potential Contribution
Authors: Kugler Gili
Published: December 2014

In its reference to the people’s sins in the wilderness, Psalm 106 connects the episode of the spies to the future exile. This idea, that the exile came as a result of the sins of the ancestors, is not found in the Pentateuch. We do find it in Ezekiel 20, in the prophet’s attempt to present the fate of Israel as foretold and deterministic. This paper asks why and in what way the psalmist adopts Ezekiel’s idea and terminology. The psalmist cites Ezekiel’s words almost entirely, acknowledging that the situation of the exile was predetermined. However, in its new context, this idea is altered as the psalmist highlights the people’s ability to influence and ease the severity of their situation.

Dans sa référence aux péchés du peuple dans le désert, le Psaume 6 relie l’épisode des espions à l’exil futur. Cette idée que l’exil résulte des péchés des ancêtres ne se trouve pas dans le Pentateuque; on la trouve en Ez. 20, tentative du prophète de présenter le destin d’Israël comme annoncé et prédéterminé. Cette étude vise à comprendre pourquoi et de quelle manière le Psalmiste adopte l’idée et la terminologie d’Ezéchiel; il cite les paroles du prophète presqu’entièrement et reconnaît ainsi que la situation de l’exil était prédéterminée. Cette idée est cependant modifiée dans son nouveau contexte, dans la mesure où le Psalmiste relève la capacité du peuple à changer et à alléger la dureté de sa situation.

Mit seinem Verweis auf die Sünden des Volkes in der Wüste verbindet Ps 106 die Kundschafterepisode mit dem zukünftigen Exil. Die Vorstellung, dass das Exil eine Folge der Sünden der Vorfahren war, findet sich so nicht im Pentateuch. Dagegen ist sie in Ez 20 belegt, wo der Prophet versucht, Israels Schicksal als vorhergesagt und vorherbestimmt zu präsentieren. In diesem Aufsatz wird gefragt, warum und in welcher Weise der Psalmist die Vorstellung und die Terminologie Ezechiels aufnimmt. Der Psalmist zitiert Ezechiels Worte fast vollständig und erkennt damit an, dass die Situation des Exils vorbestimmt war. Doch in ihrem neuen Kontext wird diese Vorstellung insofern verändert, als der Psalmist die Fähigkeit des Volkes, die Schwere seiner Situation zu beeinflussen und zu erleichtern, hervorhebt.
MANAGEMENT OF ENDOCRINE DISEASE: Pituitary tumour apoplexy
Authors: Capatina Cristina , Inder Warrick , Karavitaki Niki , Wass John A H
Published: December 2014

Pituitary tumour apoplexy (PA) is a rare clinical syndrome that occurs as a result of acute haemorrhage and/or infarction within a frequently undiagnosed pituitary tumour. The sudden enlargement of the pituitary mass undergoing PA is responsible for a wide range of acute symptoms/signs (severe headache, visual loss, diplopia, hypopituitarism, impaired consciousness) which, together with the radiological evidence of a pituitary lesion, establish the diagnosis. The optimal care of PA requires involvement of a multidisciplinary team including endocrinologist, neurosurgeon, neuroophthalmologist and the management strategy that depends on the clinical manifestations, as well as the presence of co-morbidities. Prompt surgical decompression is initially indicated in cases with severe or progressive impairment of the visual acuity or the visual fields or with altered mental state and leads to visual and neurological recovery in most of the patients. The patients with mild, stable clinical picture (including those with isolated ocular palsies) can be managed conservatively (support of fluid and electrolyte balance and stress doses of steroids in most cases) with favourable visual and neurological outcome. Frequent reassessment is mandatory because the clinical course can be unpredictable; if progression of symptoms occurs, later elective surgery is indicated and is beneficial, especially in terms of visual outcome. The endocrinological outcome is less favourable, irrespective of the treatment option, with many patients remaining on long-term replacement therapy. Despite the above guidelines, clear proof of optimal outcomes in the form of randomised controlled trials is lacking. Regrowth of the pituitary tumour years after a PA episode is possible and patients require long-term surveillance.
A Parametric Study of Heat Transfer for the Optimization of Fin Sinks
Authors: J.M. Blanco  , E. Armendáriz  , J. Esarte
Published: December 2014

Fin heat sinks are the most widely used type of heat sink for cooling purposes nowadays where space is a key factor, such as for the cooling of electronic equipment. Improved cooling capacity and the lowest possible thermal resistance in the design optimization process of these sink geometries means that we should consider a number of variable parameters, which can involve tedious design processes that are almost impossible to approximate to a sufficient degree of accuracy without computer simulation tools. The principal parameters are the heat dissipation base area, fin size, shape and material and the heat transfer coefficient. Computer numerical simulation tools greatly assist the design process, allowing in turn a greater range and more accurate analysis of the problem itself. In this study, we develop a design tool called "Opti-fin" for a Matlab ® environment that allows the user to configure a fin on the basis of the material and the thermal heat that will be released. Our study also includes a realistic estimation of fluid (air) flows that control the temperature dependency of the fin. This tool has been validated by computational fluid dynamic simulations using ANSYS-FLUENT®, in which the results of the simulation and the actual triangular shaped fin showed a remarkable similarity.
Cold Flow Simulation in Underground Coal Gasification (UCG) Cavities
Authors: Dipankar Chatterjee  , Satish Kumar Gupta  , Chebolu Aravind  , Rakesh Roshan
Published: December 2014

Underground coal gasification (UCG), in the recent years, have gathered a significant amount of interest from the researchers because of its advantages over conventional mining and utilization techniques. It is one of the most promising and innovative technology where coal is gasified in-situ by injection of a suitable oxidant for the production of synthetic gas. The simultaneous occurrence of several phenomena such as complex flow patterns, chemical reactions, water influx, thermo-mechanical failure of the coal seam etc. make the mathematical modeling of the entire UCG process very abstruse and computationally challenging. The reaction between the oxidant and the coal in the deep underground seams leads to the formation of combustible gas and subsequently results in a cavity. As the gasification proceeds the cavity grows three dimensionally in a non-linear fashion. The cavity size strongly depends on several parameters like position and orientation of the inlet nozzle, coal properties etc. A comprehensive three-dimensional numerical study is conducted to understand the hydrodynamics within a given cavity size which would give us a relatively quick but reliable insights into the process. Five different cavity sizes are considered inside which the complete turbulent transport is simulated. Apart from the usual vertical and horizontal injection, the effect of inclined injection on the hydrodynamics is also reported here for the first time.
Dang Dinh Ang: Nonlinear analysis and mechanics (on the occasion of his eightieth birthday)
Authors: Dao Nguyen Van , Dung Nguyen
Published: December 2014

Professor Dang Dinh Ang is having his eightieth birthday this year. In honor of the occasion, the Institute of Applied Mechanics and the Institute of Mechanics of The Vietnamese Academy of Science and Technology, and the Laboratoire de Mechanique des Solides, Ecole Polytechnique Paris, with the participation of Vietnam Society of Mathematics, Vietnam Association of Mechanics will jointly organize an International Conference on "Nonlinear Analysis and Engineering Mechanics Today" at the Institute of Applied Mechanics, Vietnamese Academy of Science and Technology, December 11-14, 2006 in Hochiminh City, Vietnam.
Using FEM for large deformation analysis of inflated air-spring cylindrical shell made of rubber-textile cord composite
Authors: Nam Tran Huu
Published: December 2014

An orthotropic hyperelastic constitutive model is presented for large deformation analysis of the nonlinear anisotropic hyperelastic material of the cylindrical air-spring shell used in vibroisolation of driver's seat. Nonlinear hyperelastic constitutive equations of orthotropic composite material are incorporated into the finite strain analysis by finite element method (FEM). The results of deformation analysis of the inflated air-spring shell made of composite with rubber matrix reinforced by textile cords are given. Obtained numerical results of deformation corresponding to the experimentally measured deformation of the inflated cylindrical air-spring.
Van der Pol systems with various restoring elements
Authors: Dinh Nguyen Van , Chi Tran Kim
Published: December 2014

Van der Pol oscillators with various linear and cubic restoring elements are examined. The evolution of stationary self-excited oscillations is described and the role of self-excitation as that of restoring elements is shown. Numerical method on computer is used.
Buckling of the initial imperfect rectangular thin plate with variable thickness
Authors: Luong Nguyen Thi Hien , Tuong Dang Thuy Minh
Published: December 2014

This paper analyzes the stability of the rectangular thin plate with sinusoidal changes in the plate thickness combined with initial curvature based on the large deflection theory. The buckling load for simply supported plates is defined using the energy method. The influence of the thickness variation parameter and the initial curvature parameter on the critical loads is investigated.
Damage detection of beam by natural frequencies: General theory and procedure
Authors: Khiem Nguyen Tien
Published: December 2014

The frequency equation of single damaged beam has been established for arbitrary boundary conditions that is the main tool for analysis as well as identification of damaged beam by using measured natural frequencies. A procedure for damage detection problem presented in this paper consists of three steps. First, the modelling error is reduced by a model updating procedure, in which the material, geometrical parameters and boundary conditions are updated. Then, measurement data are corrected based on the updated model. Finally, the damage parameters are identified using updated model and corrected measurement data. Theoretical investigation is illustrated by an example.
On the compression softening effect of prestressed beams
Authors: Khang Nguyen Van , Dien Nguyen Phong , Huong Nguyen Thi Van
Published: December 2014

The main objective of the present paper is to study the transverse vibration of the prestressed beams. The differential equation of the transverse vibration of the Euler-Bernoulli beam is developed, in which the initial axial strain in every cross section of the beam is taken into account, so that the initial normal stress is not equal to zero. We have proposed some formulae to determine the natural frequencies of the prestressed beam. The forced transverse vibration of the beam with a moving external force has been considered. From this it follows compression softening effect of prestressed beams. A detailed comparison between the calculating results for the prestressed and the non-prestressed beam is also presented.
The influence of nonlinear terms in mechanical systems having two degrees of freedom
Authors: Tinh Nguyen Duc
Published: December 2014

For many years the higher order stochastic averaging method has been widely used for investigating nonlinear systems subject to white and coloured noises to predict approximately the response of the systems. In the paper the method is further developed for two-degree-of-freedom systems subjected to white noise excitation. Application to Duffing oscillator is considered.
Non-linear analysis on stability of corrugated cross-ply laminated composite plates
Authors: Bich Dao Huy , Phu Khuc Van
Published: December 2014

In the present paper the governing equations for corrugated cross-ply laminated composite plates in the form of a sine wave are developed based on the Kirchoff-Love's theory and the extension of Seydel's technique. By using Bubnov-Galerkin method approximated analytical solutions to the non-linear stability problem of corrugated laminated composite plates subjected to biaxial loads are investigated. The post buckling load-deflection curve of corrugated plates and analytical expressions of the upper and lower buckling loads are presented. The effectiveness of corrugated plates in enhancing the stability compared with corresponding fiat plates is given.
Calculation of loading-induced tendon slip in beams prestressed with external tendons. Part II: Numerical analysis
Authors: Diep Bui Khac , Quang Lam Huu
Published: December 2014

In this paper, a computing method for the tendon slip based on the force equilibrium condition at deviators was proposed. The proposed method for the evaluation of tendon slip was presented in a general form by taking into account all possibilities of tendon slip at deviators, and several factors found to be important that affect the tendon slip, such as effects of the slippage at two adjacent deviators, friction, change of tendon angles during the applied load, etc. The validation of the proposed method was verified by comparing with the experimental results. The predicted results showed a close agreement with the experimental observation.
Application of the curvature smoothing technique for four-node quadrilateral Reissner-Mindlin plate element
Authors: Hung Nguyen Xuan , Phong Ngo Thanh
Published: December 2014

A quadrilateral element with smoothed curvatures for Reissner-Mindlin structure plates is proposed. A curvature matrix at an arbitrary point is normalized by a non-local approximation over a smoothing function. By choosing a constant smoothed function and applying the divergence theorem, the bending stiffness matrix calculated on boundaries of smoothing elements (smoothing cells) instead of on their interior. Several numerical results are analyzed to demonstrate high reliability and free locking of the proposed method.
Finite element analysis of laminated composite plates using high order shear deformation theory
Authors: Khoa Ngo Nhu , Thinh Tran Ich
Published: December 2014

A rectangular non-conforming element based on Reddy's higher-order shear deformation plate theory is developed. Although the plate theory is quite attractive but it could not be exploited as expected in finite-element analysis. This is due to the difficulties associated with satisfaction of inter-elemental continuity requirement and satisfy zero shear stress boundary conditions of the plate theory. In this paper, the proposed element is developed where Reddy's plate theory is successfully implemented. It has four nodes and each node contains 7 degrees of freedom. The performance of the element is tested with different numerical examples, which show its precision and range of applicability.
Using Betts-Miller-Janjic convective parameterization scheme in H14-31 model to forecast heavy rainfall in Vietnam
Authors: Hang Vu Thanh , Xin Kieu Thi
Published: December 2014

According to Krishnamurti, improvements of physical parameterizations will mainly affect simulations for the tropics [10]. The study of William A. Gallus Jr. showed that the higher the model resolution and more detailed convective parameterizations, the better the skill in quantitative precipitation forecast (QPF) in general [16]. The quality of precipitation forecast is so sensitive to convective parameterization scheme (CPS) used in the model as well as model resolution. The fact shows that for high resolution regional model like H14-31 CPS based on low-level moisture convergence as Tiedtke did not give good heavy rainfall forecast in Vietnam. In this paper we used the scheme of Betts-Miller-Janjic (BMJ) based on the convective adjustment toward tropical observationally structures in reality instead of Tiedtke in Hl4-31. Statistical verification results and verification using CRA method of Hl4-31 of two CPSs for seperated cases and for three rain seasons (2003-2005) shows that heavy rainfall forecast of Hl4-31/BMJ is better than one of H14-31/TK for Vietnam-South China Sea. CRA verification also shows that it is possible to say that heavy rainfall forecast skill of l-I14-31/BMJ in tropics is nearly similar to the skill of LAPS of Australia.
Formulation of the membership function and determination of the input of fuzzy loads in the structural fuzzy analyzing problem
Authors: Pho Nguyen Van
Published: December 2014

The fuzzy analyzing process consists of different steps. In this paper, the author considers only the method for formulation of the membership function of fuzzy loads acting on the structure. Based on the membership function of fuzzy loads, the combinations of deterministic of the regression analyzing process will be determined. The membership function of fuzzy loads is selected by the triangular membership function. It is in conformity with the concept on selection of loads in the design standards. The combination of inputs for the analyzing process will be determined, based on the number of present times of the value of input parameters (including the deterministic parameters, fuzzy parameters and the random ones) in the schema of analysis. The number of present times of input parameters is either proportional to value of the corresponding membership function or to the value of the probabilistic density function. A method for determining the appropriate combination of deterministic inputs so that each input parameter will present only one time in each combination is proposed. To illustrate the proposed method, an example on the determination of input combinations of tornado's velocity in Vietnam is presented.
Dao động không dừng của hệ động lực có bộ tắt chấn
Authors: Dao Nguyen Van
Published: December 2014

Special Issue Dedicated to the Memory of Prof. Nguyen Van Dao
Parametric vibration of mechanical system with several degrees of freedom under the action of electromagnetic force
Authors: Dao Nguyen Van
Published: December 2014

Special Issue Dedicated to the Memory of Prof. Nguyen Van Dao
A numerical approach of chaotic motions in a Duffing-Van der Pol oscillator
Authors: Dao Nguyen Van , Dinh Nguyen Van , Chi Tran Kim , Dung Nguyen
Published: December 2014

In the present paper the influence of the excitation frequency (\(\nu \)) and the forcing amplitude (\(e\)) on the chaotic behaviour of the system governed by equation ...
Van der Pol's oscillator under the parametric and forced excitations
Authors: Dao Nguyen Van , Dinh Nguyen Van , Chi Tran Kim
Published: December 2014

Van der Pol's oscillator under parametric and forced excitations is studied. The case where the system contains a small parameter being quasilinear and the general case (without assumption on the smallness of nonlinear terms and perturbations) are studied. In the first case, equations of the first approximation are obtained by means of the Krylov-Bogoliubov-Mitropolskii technique, their averaging is performed, frequency amplitude and resonance curves are studied, on the stability of the given system is considered. In the second case, the possibility of chaotic behavior in a deterministic system of oscillator type is shown.
Comparison of soot radiation in diesel flame given by mathematical model and by experimental data
Authors: Ga Bui Van , Nam Tran Van , Linh Nguyen Ngoc
Published: December 2014

An integral unidirectional model is established to calculate radiation heat transfer of Diesel flame in the open air and in combustion chamber of engine. Based on the temperature and soot fraction given by the flamlet theory and soot formation model of Tesner-Magnussen, radiation of soot particulate cloud at different positions of flame is determined and compared with experimental data obtained by the two-color method.The results show that the radiation given by the model is 203 lower than that produced by experiments on the stationary flame in open air. Soot radiation intensity in the Diesel engine increases in function of load and engine speed regimes and its maximum value (about 2000 kW/m2) is reached when the highest pressure is attained in combustion chamber.
Modeling and stability analysis for an ultrasonic motor
Authors: Gutshchmidt Stefanie , Seplsberg-Korspeter Gottfred , Hagedorn Peter
Published: December 2014

The development of motor models, adequate for motor design and optimization is still behind the technological state of the art. The reason for this lies in the fact that a couple of years ago the main emphasis regarding ultrasonic motors was on finding new principles or prototypes while today this has shifted towards optimization of known working concepts and motors. A systematic motor optimization demands, among at her things, a detailed dynamical understanding of the motor which not too often exists for ultrasonic motors in general.The present study deals with modeling a wobbling disk piezoelectric motor. For the model the analytic steady state solution is derived and stability of the solution is investigated. The model and the analytic steady state solution yield a detailed insight in essential dynamical phenomena by which the motor is driven. The model framework may be a guideline providing understanding in the working principle, dynamics, weighting of the parameters with respect to reliable, stable operation and optimization of such motors.
An approach to study vibration in stochastic systems based on the asymptotic method
Authors: Khiem Nguyen Tien
Published: December 2014

The well known Fokker-Plank-Kolmogorov Equation Method has been developed to study random vibration in systems with hysteresis that often described by the stochastic integro-differential equations or differential equations with delay.
On the reliability problems of structures subjected to dynamical loads
Authors: Pho Nguyen Van , Thach Le Ngoc , Binh Chu Thanh
Published: December 2014

Mechanically, the assessment of the structure's safety relates to three aspects: strength, stability and oscillation. In the oscillation problems of structures, the safety conditions are conditions of frequency, amplitude, resonance, maximum displacement,etc ...In case that the structure itself contains random parameters and subjects to external loads that are also the random parameters (or random processes), the assessment of the structure's safety according to the deterministic inequalities of structural mechanics will be insignificant. Therefore, this should be assessed according to the probabilistic point of view, namely, according to the reliability.The determination of reliability of the oscillation problems of structures encounters many difficulties because the outputs of the structural analysis problem are the random processes (or the random field). Meanwhile, up to now, the determination of a probability according to which a random process will belong to a given domain by mathematical method has not been sufficiently studied yet.In this paper, the authors, originating from a general definition on the reliability of a system by V. V. Bolotin, assess the reliability of oscillating structure, by determining the upper and the lower bounds of the reliability.The upper and the lower bounds of the reliability are recommended to be determined by determining the probability depending on only an inequality instead of determining the it depending on a system of inequalities. Thus, the determination is very favourable.
Influences of the compressibility on aerodynamic characteristics of profile under the transonic flow theory
Authors: Ngoc Hoang Thi Bich
Published: December 2014

Transonic flows are complex problems. At certain Mach numbers, in gas flows there are local transitions from the subsonic into the supersonic and reciprocally, especially the discontinuity throughout shock waves. Subsonic flows and supersonic flows have very different properties, thus calculation methods are also different-the subsonic equation is elliptic and the supersonic equation is hyperbolic. Using established programs (based on the incompressible theory, the compressible theory and the transonic theory), we studied sub-transonic flow characteristics with variations of the Mach number. Our studies are also carried out with variations of incidence, which impact on t he transonic effect. Numerical results show that the local compressibility depends on not only the speed but also the incidence. At a rather great angle of attack, local supersonic regions can appear with free Mach numbers in the order of 0.3 - the Mach number is normally considered as a speed of incompressible flows. According to these results, we can recognize for which regime the local compressibility of flow is considerable and then it is necessary to consider the problem under the transonic flow theory.
A new finite element for free vibration analysis of stiffened composite plates
Authors: Thinh Tran Ich , Khoa Ngo Nhu
Published: December 2014

A new 6-noded stiffened triangular plate element for the analysis of stiffened composite plates based on Mindlins deformation plate theory has been developed. The stiffened plate element is a combination of basic triangular element and bar component. The element can accommodate any number of arbitrarily oriented stiffeners and obviates the use of mesh lines along the stiffeners. Free vibration analyses of stiffened laminated plates have been carried out with this element and the results are compared with those published. The finite element results show very good matching with the experimental ones.