bluuebunny/crossref_metadata_2025_split huggingface dataset:
Forced nonlinear vibration of shallow shell and application to technical diagnosis
Authors: Thach Le Ngoc , Lien Tran Van 
Published: December 2014

This paper presents direct and inverse problems of forced nonlinear vibration of shallow shell. From that the method of establishment and solution of technical diagnosis for shallow shell under the vibrated load is proposed. The diagnosis criterion is the minimum of the difference between the square of experimental and theoretical data. The diagnosed parameters are the external loads and the reactions arose at the boundaries.
Two approximation methods of spatial derivatives on unstructured triangular meshes and their application in computing two dimensional flows
Authors: Lang Nguyen Duc , Lich Tran Gia , Duc Le 
Published: December 2014

Two approximation methods (the Green's theorem technique and the directional derivative technique) of spatial derivatives have been proposed for finite differences on unstructured triangular meshes. Both methods have the first order accuracy. A semi-implicit time matching methods beside the third order Adams-Bashforth method are used in integrating the water shallow equations written in both non-conservative and conservative forms. To remove spurious waves, a smooth procedure has been used. The model is tested on rectangular grids triangulari2jed after the 8-neighbours strategy. In the context of the semi-implicit time matching methods, the directional Derivative technique is more accurate than Green's theorem technique. The results from the third order Adams-Bashforth scheme are the most accurate, especially for discontinuous problems. In this case, there is a minor difference between two approximation techniques of spatial derivatives.
Free vibration of prestress Timoshenko beams resting on elastic foundation
Authors: Kien Nguyen Dinh 
Published: December 2014

This paper presents a finite element formulation for investigating the free vibration of uniform Timoshenko beams resting on a Winkler-type elastic foundation and prestressing by axial force. Taking the effect of prestress, foundation support and shear deformation into account, a stiffness matrix for Timoshenko-type beam element is formulated using the energy method. The element consistent mass matrix is obtained from the kinetic energy using simple linear shape functions. Employing the formulated element, the natural frequencies of the beams having various boundary conditions are determined for different values of the axial force and foundation stiffness. The vibration Characteristics of the beams partially supported on the foundation are also studied and highlighted. Specially, the effects of shear deformation on the vibration frequencies of prestress beams fully and partially supported on the elastic foundation are investigated in detail.
Spectral proper transformation and application to gust response prediction of structures
Authors: Hoa Le Thai , Anh Nguyen Dong 
Published: December 2014

Random turbulent loading on engineering structures which immersed in the atmospheric turbulent flow is often represented as the multi-dimensional and/ or multivariate Gaussian random loading processes. Gust response prediction, however, usually burdens a lot of computational difficulties due to turbulent loading projection on the generalized structural coordinates. In these cases, the decomposition techniques must be required to decouple the multi-variate turbulent loading into the independently generalized turbulent forces, then is associated with the generalized structural modes. This paper will present the proper orthogonal decomposition using the spectral proper transformation in the frequency domain to decouple the multi-variate turbulent loading processes. New approach in the gust response prediction of structures will be formulated with numerical example of cable-stayed bridge.
Orthogonal-based wavelet analysis of wind turbulence and correlation between turbulence and forces
Authors: Hoa Le Thai , Anh Nguyen Dong 
Published: December 2014

Recent models of wind turbulence and turbulence-force relation as well still contain uncertainties. Further studies on them are needed to gain the better knowledge to refine the existing problems from analytical computations to wind tunnel's physical simulations in the wind engineering. The continuous and discrete wavelet transforms have been applied as powerful transformation tools to represent time series into the time-frequency localization. This paper will apply the orthogonal-based wavelet decomposition to investigate the intermittency of the turbulence and to detect the turbulence-force correlation in the both temporal-spectral information using proposed cross energy of wavelet decompositions. Analyzing data have been obtained by physical measurements on model from the wind tunnel tests.
Experimental study of radiation heat transfer coefficient of diffusion flames
Authors: Ga Bui Van , Tuy Le Van , Vang Huynh Ba , Lu Le Van , Linh Nguyen Ngoc 
Published: December 2014

Basing on analysis of flame pictures given by visioscope by two-color method, the paper presents evolution of radiation heat transfer coefficient \(\varepsilon_s\) of soot in diffusion flames in air, in furnace and in combustion chamber of Diesel engine. \(\varepsilon_s\) reaches respectively its maximal value of 0.15; 0.30 and 0.45 in regions of maximal soot fraction of the three above flames.
Potential evapotranspiration estimation and its effect on hydrological model response
Authors: Nghi Vu Van , Dung Do Duc , Lam Dang Thanh 
Published: December 2014

Potential evapotranspiration can be directly calculated by the Penman-Monteith equation, known as the one-step method. The approach requires data on the land cover and related-vegetation parameters based on AVHRR and LDAS information, which are available in recent years. The Nong Son basin, a sub-catchment of the Vu Gia-Thu Bon basin in the Central Vietnam, is selected for this study. To this end, NAM model was used; the results obtained show that the NAM model has the potential to reproduce the effects of potential evapotranspiration on hydrological response. This is seemingly manifested in the good agreement between model simulation of discharge and the observed at the stream gauge.
Static and dynamic analysis of laminated composite plates with integrated piezoelectrics
Authors: Thinh Tran Ich , Ngoc Le Kim 
Published: December 2014

A Finite Element model based on First-order Shear Deformation Theory is developed for the static shape control and vibration control of la minated composite plates integrated with piezoelectric sensors and actuators. A nine-node isoparametric rectangular element with 45 degrees of freedom for the generalized displacements and 2 electrical degrees of freedom is implemented for the static and dynamic analyses. The model is validated by comparing with existing results documented in the literature. Some numerical results are presented. It is concluded that the shape of the piezoelectric laminated composite plates can reach the desired shape through passive control or active control. The influence of stacking sequence of composite plates and position of piezoelectric layers and sensors/actuators patches on the response of the piezoelectric composite plates is evaluated.
Research on manufacturing dry mixed cement mortar with high compressive strength, high flexural strength, low shrinkage and high watertightness for restoration of damaged hydraulic structures in Vietnam
Authors: Phu Nguyen Quang , Uyen Hoang Pho , Hua Jiang Lin , Jiaping Liu 
Published: December 2014

Using normal materials to manufacture the mixed mortar is necessary for restoration of hydraulic structures in Vietnam. It will salvage the materials and decreases the cost price of the mortar. In this research, we used cement made in Vietnam (Chinfon - Haiphong cement), natural sand (Lo River sand), polymer acrylic and high range water reducing (of SIKA company)' with proportion 1 : 3 : 0.03 : 0.003 by weight. The water to cement ratio is 0.5, which always ensure the compressive strength of mortar more than 40 MPa and small shrinkage, good watertightness, and high adhesion. That is suitable for the restoration of concrete structures in general and hydraulic structures in particular of Vietnam. The dry mixed mortar is manufactured and in bag of 15±0.5 kg weight.
The error estimate and the convergence rate for h, p - refinement in the finite element analysis
Authors: Son Nguyen Hoai 
Published: December 2014

The goal of this study is to further investigate and to develop a more efficient way in the error estimate and the rate of the convergence for the mesh h, p-refinement procedure in the finite element analysis for two-dimensional and three-dimensional elastostatic mechanics problems. The oscillation of the stress field around singularity points is also considered in the refinement process. In this paper, a-refinement procedure with a h-uniform and p-uniform analysis capability is called a h, p-refinement procedure. We also establish the refinement criterion for the adaptive strategy with h-refinement based on the ratio of error indicator or the enrichment indicator.
Non-destructive testing of tennis strings
Authors: Phuong Luong Minh 
Published: December 2014

The paper aims to illustrate three advantages of infrared thermography as a non-destructive, non-contact and in real time technique (a) to detect the occurrence of intrinsic dissipation localisation, (b) to observe the progressive damage processes and mechanisms of gut failure, and to determine the optimal tensions for each type of tennis strings. Experimental results evidence a limit of acceptable damage beyond which string will fail due to coalescence of defects and/or weakness zones.
Sytuacja demograficzno-społeczna wybranych miast województwa śląskiego w latach 2002 i 2009
Authors: Mielecka-Kubień Zofia , Warzecha Katarzyna 
Published: December 2014

The purpose of the research was to determine the similarities that exist among cities in the province of Śląskie with more than 100,000 inhabitants in the interval of a few years. The cities considered were Bielsko-Biała, Bytom, Chorzów, Częstochowa, Dąbrowa Górnicza, Gliwice, Katowice, Ruda Śląska, Rybnik, Sosnowiec, Tychy and Zabrze, all of which are located within close geographical proximity to one another. The similarity of the cities was analysed according to chosen socio-economic indicators and demographic coefficients in the years 2002 and 2009. J. Czekanowski method was applied; to determine which groups of cities were better or worse off with regard to the given profile of the investigation, the average values of the indicators for the entire set of the cities, and for its established groups were compared. The research was conducted in the following profiles: I - socio-demographic situation, II - population health and its determinants, III - affluence, IV - educational and cultural level. The cities that were the most similar to each other, and in the best socio-economic and demographic situation were, for both years, and in spite of the relatively big geographic distance, Bielsko-Biała and Częstochowa. Bielsko-Biała stood alone among the cities for its affluence. Sosnowiec, Zabrze and Gliwice - all cities in the former Upper-Silesian Industrial District - were similar to each other insofar as they were in the worst situation.
Propozycja modyfikacji wskaźnika ujawnionej przewagi komparatywnej z wykorzystaniem funkcji wymiernych
Authors: Salamaga Marcin 
Published: December 2014

The Revealed Comparative Advantage Index (RCA) is used to estimate the export attractiveness and comparative advantage in the country by industry sectors or commodity groups. This measure has many disadvantages because it ranges from 0 to ∞. Its empirical distribution is strongly asymmetric and is not stable in time. The Revealed Comparative Advantage Index distribution is strongly dependent on the number of reference countries, industries and commodity groups taken under consideration. In consequence, some RCA distribution parameters are not stable. These problematic properties make its outcomes impossible to compare across time and space. The paper proposes transforming the RCA measure into a new index, ranging from -1 to 1, by using a special class of rational unctions. The new measure has a symmetric distribution with a stable mean and is independent of the industry sectors or commodity groups. Empirical distributions of the adjusted RCA index are built on the basis of data on Polish export and import commodities by Standard International Trade Classification (SITC).
A new modeling approach estimates the relative importance of different community assembly processes
Authors: van der Plas Fons , Janzen Thijs , Ordonez Alejandro , Fokkema Wimke , Reinders Josephine , Etienne Rampal S. , Olff Han 
Published: December 2014

The relative importance of niche‐based (e.g., competitive or stress‐based) and stochastic (e.g., random dispersal) processes in structuring ecological communities is frequently analyzed by studying trait distributions of co‐occurring species. While filtering processes, such as the exclusion of stress‐intolerant species from particular habitats, increase the trait similarity between co‐occurring species, other processes, such as resource competition, can limit the similarity of co‐occurring species. Comparing the observed trait distribution patterns in communities to null expectations from randomized communities (e.g., a draw of the same observed richness from the regional pool) therefore gives a first indication of the dominant process driving community assembly.However, such comparisons do not inform us about the relative contribution of these different processes in shaping community compositions in case of their joint operation (a likely scenario). Using an Approximate Bayesian Computation approach, we develop a new method that allows inference of the relative importance of dispersal, filtering, and limiting similarity processes for the assembly of observed communities with known species and trait composition. We applied this approach to a tree community data set, collected across 20 plots along strong rainfall and fire gradients in a South African savanna.Based on comparisons with simulations, we find that our new approach is powerful in identifying which community assembly scenario has the highest probability to generate the observed trait distribution patterns, while traditional null model comparisons perform poorly in detecting signs of limiting similarity. For the studied savanna tree communities, our analysis yields that dispersal processes are most important in shaping the functional trait distribution patterns. Furthermore, our models indicate that filtering processes were relatively most important in areas with high fire frequencies, while limiting similarity processes were relatively most important in areas with low fire frequency and high rainfall. We conclude that our new method is a promising improvement on current approaches to estimate the relative importance of community assembly processes across different species groups, ecosystems, and biomes. Future model modifications (e.g., the inclusion of individual‐based processes) could provide further steps in uncovering the underlying assembly processes behind observed community patterns.
Comparison of carprofen and tramadol for postoperative analgesia in dogs undergoing enucleation
Authors: Delgado Cherlene , Bentley Ellison , Hetzel Scott , Smith Lesley J. 
Published: December 2014

Abstract
Objective—To compare analgesia provided by carprofen and tramadol in dogs after enucleation.
Design—Randomized, masked clinical trial.
Animals—43 dogs.
Procedures—Client-owned dogs admitted for routine enucleation were randomly assigned to receive either carprofen or tramadol orally 2 hours prior to surgery and 12 hours after the first dose. Dogs were scored for signs of pain at baseline (ie, before carprofen or tramadol administration) and at 0.25, 0.5, 1, 2, 4, 6, 8, 24, and 30 hours after extubation. Dogs received identical premedication and inhalation anesthesia regimens, including premedication with hydromorphone. If the total pain score was ≥ 9 (maximum possible score of 20), there was a score ≥ 3 in any of 5 behavioral categories (highest score possible per category was 3 or 4), or the visual analog scale (VAS) score was ≥ 35 (maximum possible score of 100) combined with a palpation score > 0, rescue analgesia (hydromorphone) was administered and treatment failure was recorded.
Results—No differences were found in age, sex, or baseline pain scores between groups. Significantly more dogs receiving tramadol required rescue analgesia (6/21), compared with dogs receiving carprofen (1/22). Pain and VAS scores decreased linearly over time. No significant differences were found in pain or VAS scores between groups at any time point (dogs were excluded from analysis after rescue).
Conclusions and Clinical Relevance—Results of this study suggested that carprofen, with opioid premedication, may provide more effective postoperative analgesia than tramadol in dogs undergoing enucleation.
Construction du discours alarmiste sur l’invasionlatinaaux États-Unis. L’instrumentalisation de la situation québécoise
Authors: Vézina Catherine 
Published: December 2014

Abstract:Since the end of the 1960s, discourse concerning Mexican immigration to the United States has become more alarmist. In the past few decades, references to the “latino invasion” and the fear of a reconquest of US territory by the “Mexican hordes” have entered the American collective imaginary. At the same time, north of the Canadian/US border, Quebec nationalism, which is perceived as a threat to Canadian unity, became a major issue. This article focuses on how the “Quebec metaphor” is used in the United States to strengthen an anti-Mexican discourse.
Deux exemples de fortifications romaines dans les Alpes occidentales : le Néron (Isère) et le Pic-de-Luc (Drôme)
Authors: Planchon Jacques , Teyssonneyre Yannick 
Published: December 2014

Two examples of Roman fortification in the Western Alps: The Néron in Isère and the Pic-de-Luc in Drôme.
Two elevated sites dating back from the late third and early fourth century can be compared along alpine passageways : one is the Néron overlooking Grenoble and the Isère valley, the other is the Pic-de-Luc overlooking the former capital of Luc-en-Diois and the Drôme valley. Both actually share similar features : big water-tanks, different buildings and fortification with one tower at least. Both sites are also provided with access tracks on difficult ground. Their common features lead one to consider that these settlements were meant to control the main alpine roads for a military purpose. As some of these remains are common to other sites in the Isère valley and surmised in other areas of the higher Drôme valley, the configuration of such connecting valleys urges one to raise the assumption that defence facilities had been built along the roads to the western alpine passes. This assumption is only a research-clue to be bolstered by fieldwork, yet it can be found relevant in the alpine historical context of the third and fourth century. Indeed, several previous events contribute to viewing the Alps as a new strategic target as of the late second century : when Clodius Albinus seceded, then at the time the Alamans raided the area in the mid third century. But, above all the "Gallic Empire" in the late third century and the appointment of a Prefect of the Guards in the Grenoble area may have made such a defence system useful in the Alps between Gaul and Italy, according to the imperial strategy.
Evergetismo y relaciones clientelares en la sociedad ateniense del siglo IV a.C.
Authors: Placido Domingo , Fornis César 
Published: December 2014

Evergetism and clientelistic relations in the fourth century B. C. Athenian society.
Contrary to the prevailing view that the structures and values of democratic Athens left no room, at least not to any significant extent, for the practices of patronage and evergetism, sources from the 4th century B. C., and in particular those that are oratory-based, appear to show that the links established between benefactors and beneficiaries corresponded to the widely accepted notion of clientelistic relations. Our understanding is that, during this same century, evergetism and clientelism constituted key mechanisms within the internal " surveillance" established by the Athenian oligarchs over the democratic politeia.
Du « nouveau » chez Plaute ? Des jeux de réécriture dans la palliata
Authors: Letessier Pierre 
Published: December 2014

Something "new" at Plaute ?
In each of his comedies, Plautus asserts he is bringing something "new", i-e something unheard of. Showing first that this difference is not that of the comedy from its Greek model but that of the comedy from the other Roman ones, this article is focused on this particular mode of rewriting which is the update of a theatrical codification, and questions the part of "new" that a ritual theatre, which is defined a contrario by its permanence, can contain. Noticing that in every play, this assertion of novelty comes along systematically, in the same movement, with a statement of conformity to tradition, the article tries finally to understand how the novelty, far from marking a break from the comical codification the public is waiting for, allows on the contrary its traditional functioning.
Promotion coloniale, frénésie évergétique et aménagement urbanistique à Thuburbo Maius
Authors: Ben Akacha Walid 
Published: December 2014

Colonial promotion, evergetic frenzy and urban planning in Thuburbo Maius.
This article intends to assess the impacts of juridical changes on the composition and the functioning of monumental units in a medium-sized city in Africa Proconsularis, Thuburbo Maius, and particularly to show the building spree triggered by the colonial promotion. It is in the context of this promotion, within which the municipal plan bursts, that we witness the migration of the urban convergence towards the western sector of the city.
Coating with luminal gut-constituents alters adherence of nanoparticles to intestinal epithelial cells
Authors: Sinnecker Heike , Ramaker Katrin , Frey Andreas 
Published: December 2014

Background: Anthropogenic nanoparticles (NPs) have found their way into many goods of everyday life. Inhalation, ingestion and skin contact are potential routes for NPs to enter the body. In particular the digestive tract with its huge absorptive surface area provides a prime gateway for NP uptake. Considering that NPs are covered by luminal gut-constituents en route through the gastrointestinal tract, we wanted to know if such modifications have an influence on the interaction between NPs and enterocytes.Results: We investigated the consequences of a treatment with various luminal gut-constituents on the adherence of nanoparticles to intestinal epithelial cells. Carboxylated polystyrene particles 20, 100 and 200 nm in size represented our anthropogenic NPs, and differentiated Caco-2 cells served as model for mature enterocytes of the small intestine. Pretreatment with the proteins BSA and casein consistently reduced the adherence of all NPs to the cultured enterocytes, while incubation of NPs with meat extract had no obvious effect on particle adherence. In contrast, contact with intestinal fluid appeared to increase the particle-cell interaction of 20 and 100 nm NPs.Conclusion: Luminal gut-constituents may both attenuate and augment the adherence of NPs to cell surfaces. These effects appear to be dependent on the particle size as well as on the type of interacting protein. While some proteins will rather passivate particles towards cell attachment, possibly by increasing colloid stability or camouflaging attachment sites, certain components of intestinal fluid are capable to modify particle surfaces in such a way that interactions with cellular surface structures result in an increased binding.