Open Access Short Research Article

Bioethanol Production from Residual Tobacco Stalks

Rosana de Cassia de Souza Schneider, Leonardo Amonte Anacker, Mateus da Silva Szarblewski, Lilian de Fátima Ferreira da Silva, Maria Silvana Aranda Moraes, Valeriano Antônio Corbellini

Current Journal of Applied Science and Technology, Page 1-9
DOI: 10.9734/CJAST/2017/37948

Aims: In this work, bioethanol production from residual tobacco stalks was investigated.

Place and Duration of Study: Stalks sampling was in South Brazil crops and experiments in chemistry laboratories at Unisc, after tobacco leaf harvest.

Methodology: Pretreatments were conducted with sulfuric acid solution (1 to 3%) in an autoclave (121°C) for 30 to 90 min. Enzymatic hydrolysis was performed with two enzymes, CTec2 and HTec2 (Novozymes). Fermentation (Saccharomyces cerevisiae) was conducted with hydrolysate obtained in selected conditions of acid pretreatment and enzymatic hydrolysis.

Results: In enzymatic hydrolysis, 38.1% glucose was obtained from the pretreated solid. The ethanol yield was 0.06 to 0.19 g of ethanol per g of dried and milled tobacco stalk. The results showed that it is possible to use this biomass for the ethanol production; however, some saccharification variables can still be modified to increase the conversion.

Conclusion: Thus, tobacco stalk, which has no economic value, appears to be a source of monosaccharides for the fermentation and production of bioethanol. Furthermore, the exploitation of tobacco stalks may be of great importance to agriculture and industry as currently over 300,000 ha of land in Southern Brazil is used for tobacco production, and after harvesting, the stalks simply remain unused in the soil.

Open Access Short Research Article

Research of SLA-Based Multitask-User-Requests Admission Control and Related Algorithm for the Cloud Service Provider

Zhi-Hong Liang, Dong Wang, Fei Dai, Yu-Xiang Huang

Current Journal of Applied Science and Technology, Page 1-11
DOI: 10.9734/CJAST/2017/37852

With the population of Cloud service users showing an explosive growth, how to reduce costs and improve resource utilization while ensuring service quality has become a very important bargaining chip for the cloud service provider can survive in the fierce competition in the industry or not. Based on the service level agreement (SLA) constraints of Cloud service, this paper studies the request admission control strategy of multitask-user-requests. By discussing and analyzing the possible problems in the different stages of request admission, resource scheduling and subtasks execution for multitask-user-requests, tow priority dynamic configuration strategies and a delay compensation strategy are proposed to improve the ratio of requests acceptance, cut down SLA default rates during subtasks are executed, and improve users’ experience while the SLA violate occurs. What’s more, two resource scheduling strategies aimed at improving the resource utilization rate to reduce the cost of Cloud services as much as possible are proposed. And at the end of the article put forward the Dynamic configuring Priority Resources Scheduling (DPS) algorithm which based on the strategies above, and designed the relevant comparative experiments to verify the algorithm of DPS. The results showed that the DPS algorithm can reduce the usage of resources by improving resource utilization rate and helps the service providers to create much more profits than the other two algorithms to a certain extent.

Open Access Original Research Article

Impact Assessment of Manure and Nitrogen Level on Phenology, Yield Attributes, Yield and Energy Use Efficiency in Pearlmillet

Manjeet ., Parveen Kumar, Anil Kumar, Harender .

Current Journal of Applied Science and Technology, Page 1-7
DOI: 10.9734/CJAST/2017/37473

A field experiment was conducted at Agronomy Research Area, Chaudhary Charan Singh Haryana Agricultural University, Hisar during Kharif season 2016 to assess the impact of manure and nitrogen on phenology, yield and energy use efficiency of pearl millet hybrid (HHB-223). The treatment consisted of manurial treatment viz. control, biomix, and vermicompost at the rate of 2.5 t ha-1 and vermicompost at the rate of 2.5 t ha-1 + biomix and nitrogen levels viz. 70, 80, 90 and 100 percent recommended dose of nitrogen (RDN). Different nutrient management practices did not differ significantly in respect of various phenological events viz. emergence, five leaf stage and initiation of the milking while boot stage, 50 percent flowering and physiological maturity were affected significantly. Yield attributing characters viz. effective tiller per plant, earhead length, earhead girth, test weight and grain, stover yield affected significantly by the application of manure and nitrogen levels. Among manurial and nitrogen level treatment these character were higher with biomix + vermicompost at the rate of 2.5t ha-1 and 100 percent recommended  dose of nitrogen (RDN). The radiation used efficiency among different treatment there was not  found the significant variation in the incepted photosynthetic radiation use efficiency and lowest radiation use efficiency (RUE) was in grain yield and highest in biological yield of respective treatments.

Open Access Original Research Article

Hybrid Panels of Wood Plies and Particles Pinus sp

Laurenn Borges de Macedo, Giovana Gobatto Balanco, Lucas José Marini, Tulio Hallak Panzera, André Luiz Christoforo, Francisco Antonio Rocco Lahr

Current Journal of Applied Science and Technology, Page 1-9
DOI: 10.9734/CJAST/2017/36951

The aim of this study was to develop a hybrid panel produced with wood plies and wood particles of Pinus sp. as an alternative to plywood. Tests were performed to determine mechanical properties in static bending: elasticity modulus and rupture modulus, in addition to physical testing to determine thickness swelling after 24 hours water submersion. These properties were compared with normative documents of plywood (DIN 68792) and OSB (EN 300: 2006). It was possible to conclude that panels produced in this study are in accordance with the minimum requirements of two Normative codes related to evaluated properties, which proves technical feasibility of its production.

Open Access Original Research Article

Selection and Identification of a Newly Isolated Thermotolerant and Amylolytic Saccharomyces cerevisiae Strain for Ethanol Production

B. H. Joshi, R. M. Dhingani, R. V. Prasad

Current Journal of Applied Science and Technology, Page 1-10
DOI: 10.9734/CJAST/2017/38104

Thermotolerant and ethanogenic Saccharomyces cerevisiae ETGS1 was isolated from the grape samples by an enrichment technique using yeast extract peptone dextrose (YEPD) broth. This was obtained after the extensive screening of 67 samples from diverge ecosystem. The strain was found to tolerate ethanol concentration up to 12%. Enzyme profiling of this selected strain also revealed its amylolytic potentials. This isolate of S. cerevisiae was found to ferment YPS medium at elevated temperature in a single step with fermentation efficiency of 70.47%. It was found to produce 31 g/l of ethanol with yield of 0.4 (p/s, g/g). Looking to the prospects of this newly isolate for the conversion of starch based waste into ethanol in a single step without any complex pretreatments, it was selected for further thorough characterization. Based on the morphological, cultural and biochemical characterization followed by molecular analysis of 18S rDNA, it was identified as the strain of S. cerevisiae.

Open Access Original Research Article

Numerical Evaluation of the Axial Resistance Force in Steel Column Design

Alexandre Rossi, Felipe Piana Vendramell Ferreira, Carlos Humberto Martins

Current Journal of Applied Science and Technology, Page 1-11
DOI: 10.9734/CJAST/2017/38210

The finite element method (FEM) is a form of computational analysis that provides approximated results with acceptable accuracy. By using the FEM, developing theoretical models capable of properly analyzing the effects of the structural behavior under the influence of proposed imperfections becomes easier and more economical. Metal columns are elements that, when subjected to axial compressive forces, undergo a phenomenon called buckling. This phenomenon consists of the loss of stability in the element, causing a displacement in the buckling axis of the structure. However, some construction imperfections in the materials cause the buckling phenomenon to not have the classic behavior predicted in the studies by Euler. Therefore, this study will present a numerical analysis of metal columns in rolled profiles with parallel flanges. During the simulations, the variations in physical and geometrical  imperfections were evaluated with different distribution models. The purpose was to evaluate the influence of such imperfections on flexural buckling, comparing the results obtained with numerical simulations to those obtained analytically. As indicated by the results of this evaluation, the physical and geometrical imperfections influence buckling in the case of columns with low slenderness ratios, significantly decreasing their strength. For higher slenderness ratios, i.e., greater lengths, this effect is decreased.

Open Access Original Research Article

Performance Augmentation of a Gas Turbine Plant Using an Absorption Refrigeration System

Robert Poku, Promise O. Ohochuku, Tokoni W. Oyinki

Current Journal of Applied Science and Technology, Page 1-10
DOI: 10.9734/CJAST/2017/37937

Performance of a gas turbine is mainly depended on the inlet air temperature. The power output of a gas turbine depends on the flow of mass through it. Inlet air cooling increases the power output by taking advantage of the gas turbine’s feature of higher mass flow rate when the compressor inlet temperature decreases. In this paper the performance enhancement of gas turbine power plants by cooling the compressor intake air with an absorption refrigeration system was studied. This work investigated the effect of inlet air cooling system on the performance of an existing gas turbine power plant in Nigeria and it was made possible with MATLAB R2013a. The results showed that when the intake air temperature decreases by 10-15°K, the Efficiency and Net-work output increases by 7% and 8.4% respectively. Therefore, it becomes clear that there is increment in performance as the turbine inlet temperature approaches the ISO rating 15°C.