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Volume 6 Issue 5 (May 2019)

S.No. Title & Authors Page No View
1

Title : Chestnut-Aluminium Combination tanning System for High Stability Leather

Authors : Mubark Yahia, A.E Musa, G.A. Gasmelseed, E.F. Faki, H.E Ibrahim, O.A Haythem, M.A Manal, S.B Haythem

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Abstract :

Extensive research has been undertaken by many scientists in the modern leather industry and some alternative options have been proposed, among which the combination tanning of vegetable tannin and aluminum may be a good choice. In the present study, a combination tanning system based on Chestnut-Aluminum tannage for the production of upper leathers as a cleaner alternative is presented. The Castanea sativa powder (Chestnut) has been used in a combination tanning system based on Chestnut and Aluminum sulphate. Both tanning methodologies Chestnut followed by Aluminum (Chestnut-Al) and Aluminum followed by Chestnut (Al-Chestnut) have been attempted. Chestnut-Al leathers tanned using 20% Chestnut; followed by 2% Al2O3 resulted in shrinkage temperature of 100oC. However, Al-Chestnut leathers tanned using 2% Al2O3; followed by 20% Chestnut resulted in shrinkage temperature of 94oC. Chestnut-Al combination system resulted in leathers with good organoleptic and strength properties. The work presented in this paper established the use of Chestnut-aluminium combination tanning system as an effective alternative eco-friendly tanning process.

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2

Title : Modelling the Effects of Farnesol and CO2 on the cAMP Pathway Regulating Morphogenesis in Candida albicans

Authors : Mareta W. Ardyani

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Candida albicans is reported to be the predominant cause of invasive fungal infections. Morphogenesis is named as one of the main factors making this organism an effective pathogen. Among several different signaling cascades governing morphogenesis in C. albicans, the cAMP pathway is reported to be the most crucial, with most signals being regulated through the adenylyl cyclase, Cyr1p. Here we present two mathematical models which investigate the roles of a quorum sensing molecule, farnesol, in inhibiting the cAMP pathway and CO2 in activating it: Model 1, where farnesol directly degrades cAMP and Model 2, where farnesol triggers the dissociation of the complex Cyr1p~CO2, a vital agent in cAMP production. Throughout our analysis, we demonstrate that Model 2 performs a more effective mechanism in inhibiting the cAMP pathway compared to that of Model 1. Finally, we suggest that if we could design a therapeutic molecule to treat fungal infections caused by C. albicans, the molecule should target Cyr1p~CO2 instead of cAMP.

7-23
3

Title : Study of seismic behavior on multi-storied buildings with square composite columns

Authors : Han Thi Thuy Hang

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The article studies seismic behavior of multi-storied buildings with two types of square composite columns. The main objective of this paper is to evaluate the comparison of square composite columns: concrete-filled steel (CFS) and concrete encased I section (CES). This paper is mainly emphasis on the structural behavior of multi-storied buildings for different plan configurations like rectangles, U shape, L shape, H-shape and irregular plan with two different columns property. It is also to compare and find which building with the composite column is more effective against lateral loads. The present work deals with the seismic behavior of 15 storey building assessed through dynamic analysis (response spectrum method) as per TCVN 9386:2012 for Vietnamese seismic area, using ETABS 2016 software. The results are tabulated, compared and final conclusions are framed. From the output of ETABS, various results are obtained. And these results are evaluated by preparing various graphs.

24-27
4

Title : Determining Weights By Entropy Measures In Case Of Heteroscedasticity

Authors : Hatice Ciodem Cin, Atif EVREN

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In simple  regression analysis, the dependent variable is assumed to have constant variance at different levels of independent variable. Whenever the assumption of constant variance fails, some remedies like the weighted least squares, or Box-Cox transformation may be helpful. While Box-Cox approach is based on a nonlinear transformation on the dependent variable, in the weighted least squares methodology, independent variable is rescaled by weights to maintain constant variance. Although there is already a large literature on this issue, determining the weights seems a major problem. In this study, the weights are alternatively calculated by entropy approach, since statistical entropy, and variance conveys similar information about a probability distribution. In this study, by exploiting the normality assumption of linear models, the weights are determined by the reciprocals of Shannon, Tsallis and Renyi entropies of normal distribution. The weighting procedure has been applied on some simulated data having nonconstant variance. In some applications we have shown that weighting by Tsallis and/or Rényi entropies produced better goodness of fit results in terms of coefficient of determination, and the mean square error.

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5

Title : Gorenstein FPn injective modules

Authors : Li Zhang

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In this paper, we introduce and study Gorenstein FPn injective modules and investigate the homological properties of them. 

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6

Title : Strength and Skin Temperature Assessment: Comparing Active and Geriatric Populations

Authors : Carolina Magalhaes, Pedro Contente, Ricardo Vardasca, Paulo Abreu, Joaquim Mendes, Maria Teresa Restivo

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The age-related consequence of loss of skeletal muscle strength can be evaluated by handgrip force (HGF) tests. The assessment of this parameter is performed with dynamometers and it is frequently used as a functional indicator of different pathologies. During gripping exercises, physiological alterations occur that can be quantified with infrared thermography (IRT), adding information to an individual’s health status assessment. This work focus on the use of HGF and IRT measurements to evaluate differences among populations of active and institutionalized individuals, and on the identification of correlations between thermal parameters and HGF measurements. The study’s population included 30 active adults and 32 institutionalized individuals. Each performed an established handgrip exercise, mechanically stimulating forearm muscles. IRT images of this body region were recorded during the entire experiment. Three regions of interest (ROIs) were established for thermal image analysis, encompassing the digital flexor muscle region and the wrist ulnar and radial artery zone. Differences between populations were verified for the collected data, showing higher HGF measurements (Maximum force, Average force and Accumulated handgrip work) and elevated skin average temperatures for active adults, when compared to institutionalized participants. Strong correlations between HGF measurements and thermal parameters were also encountered, suggesting its relevance for future research. Thus, the results demonstrate the importance of pairing different types of technologies to increase the range of information and confidence in the results for possible medical applications. Some usages may include the diagnosis, prediction and treatment monitoring of musculoskeletal pathologies, as rheumatoid arthritis, tendinitis and carpal tunnel syndrome.

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7

Title : Strongly Gorenstein injective complexes with respect to a cotorsion pair

Authors : Kaiying Yuan

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This paper introduces strongly Gorenstein injective complexes with respect to a cotorsion pair , that is, strongly Gorenstein injective complexes, and give some properties and equivalent characterizations. Firstly, we define Gorenstein injective complexes, that is the complexes of Gorenstein injective modules, and discuss some properties. Secondly, we define strongly Gorenstein injective complexes, and prove Gorenstein injective complex is a summand of some strongly Gorenstein injective complex.

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8

Title : Solution to increase the strength when the large wind, the storm for the type of rural houses in mountainous areas of Thai Nguyen province in Vietnam

Authors : Nguyen Tien Duc

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Strengthening resilience to strong winds and storms for rural houses in mountainous areas of Thai Nguyen province in Vietnam is an urgent requirement in the current global climate change conditions. The paper identifies the possibilities to enhance resilience to wind and storms of rural areas in Thai Nguyen province in Vietnam. Then select three reinforcement options suitable to economic and social conditions. and practical local techniques. Thereby modeling three structural options selected by Etabs software, comparing the internal forces of each plan to choose the best option for rural mountainous areas in Thai Nguyen province in Vietnam.

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9

Title : Evaluation of hardened properties of self-consolidating high performance concrete using supplementary cementing material

Authors : Kiran. B, Dr. Nagaraja. P.S

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This ipaper imainly ipresents ithe ihardened iproperties iof iself-consolidating ihigh iperformance iconcrete i(SCHPC). iA ivariety iof iSCHPCs iwere iproduced iwith idifferent iwater/binder i(W/B) iratios, irice ihusk iash i(RHA) icontents, iand ialso iair icontents. iThe irequired ifilling iability iand iair icontent iwere iachieved iin iall ifreshly imixed iSCHPCs. iThe ihardened iself iconsolidating ihigh iperformance iconcretes iwere itested ifor icompressive istrength iand iultrasonic ipulse ivelocity. iThe ieffects iof iWater/Binder iratio, iRice iHusk iAsh icontent, iand iair icontent ion ithese ihardened iproperties iwere iobserved. iTest iresults irevealed ithat ithe icompressive istrength iand iultrasonic ipulse ivelocity iincreased iwith ilower iW/B iratio iand ihigher iRHA icontent. iIt iwas iwitnessed ithat ithe iair icontent idecreased ithe icompressive istrength iand iultrasonic ipulse ivelocity.

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10

Title : Design State Feedback Controller in Multisim Software For DC - DC Buck Converter

Authors : Thi Ngoc Anh Dang, Viet Nguyen Hoang

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DC-DC convertion process is based on the principle of controlling electronic components working in linear mode (continuous converter) or switching mode (pulse converter). Later converters tend to develop due to their size and performance advantages. In this paper we will design controller for DC-DC Buck converter by state feedback control. Simulation results on the Multisim software will show the efficiency of this controller.

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11

Title : Investigations on mooring system design for a floating platform in shallow water

Authors : Hui Liu, Qianqian Jia, Xiaofeng Meng, Haoran Liu, Shuai Guo

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Based on the finite water depth Green function, Morison equation and coupled dynamic analysis method, dynamic response analysis was performed for a platform in shallow water with different types of mooring systems. The results show that traditional catenary or taut mooring systems, usually adopted for medium or deep water depth, will encounter a range of problems in very shallow water near islands and reefs, and the room for further optimization is very limited. However, the pile anchor chain hybrid mooring system proposed in this paper can overcome these problems, and at the same time, makes ship docking much more convenient. The analysis results in this paper have certain guiding significance for model tests and further design of mooring systems in very shallow water.

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12

Title : Study of Residual Stress Effect on Hydrogen Diffusion of X-groove Flat Butt Welded Joints

Authors : Qianqian Jia, Kaixiang Sun, Hui Liu, Xiaofeng Meng

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Ships are usually large-welded structures, and residual stress would inevitably occur in the welding process. At present, high-strength steel has been more and more widely used in ship structures, and it has high sensitivity to residual stress. At the same time, in the high temperature during the welding process, the hydrogen-containing compound in the arc welding is decomposed into monoatomic hydrogen, which is dissolved in the molten pool in a large amount. Uneven weld residual stresses in such structures can promote the diffusion and accumulation of hydrogen in the steel, resulting in excess hydrogen at the weld joint. This behavior can lead to hydrogen embrittlement, threatening the safety and reliability of the ship's structure. In this study, a three-dimensional finite element analysis thermodynamic model for the flat butt welding joints of high-strength steel was established, the welding process was simulated, and the distribution law for the welding residual stress field was obtained based on the thermal elastic-plastic theory. Then the sequential coupling calculation of hydrogen diffusion was performed by defining the welding residual stress field of flat butt welding joint of high strength steel as the pre-defined field, and the hydrogen diffusion behavior under the welding residual stress field was obtained based on the theory of residual stress-induced hydrogen diffusion. The results show that the welding residual stress level decreases rapidly with the increase of the weld distance. The welding residual stress affects the hydrogen diffusion behavior, hydrogen is enriched in the zone where the residual stress is high, and the heat affected zone is the region with high residual stress. These results could provide theoretical support for ensuring the safety and reliability of large ship structures.

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