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Volume 6 Issue 9 (September 2019)

S.No. Title & Authors Page No View
1

Title : Relation between peak value and acoustic damping of sound pressure level of one dimensional sound field partitioned with perforated plates

Authors : Kunihiko ISHIHARA, Akari GOTO, Makoto KASHINO

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Abstract :

In an industry field, the acoustic characteristics such as a resonance frequency and an acoustic damping ratio are often required. The response test due to a random noise wave and the sweep test due to a sinusoidal wave can be performed in those cases. In vibration theory, it is well known that the peak value at resonance is inversely proportional to the damping ratio. Is it true even in the acoustic theory? If it can be true the acoustic damping ratio can be obtained simply by the peak sound pressure level after the relation between the peak value and the damping ratio is examined only once. In this study, the sound pressure level of the one dimensional duct with the perforated plate will be calculated by the transfer matrix method in various parameters such as the aperture ratio, the hole’s length and the set position of the plate. These calculations are conducted for the first mode, the second mode and third mode. And the relation between the peak value and the damping ratio are examined.

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2

Title : Design of gas extraction systems for modyfing comfort in closed spaces

Authors : Aranda-Jimenez, Y.G. Suarez-Dominguez, E.J. Zuñiga-Leal, C. Marín-Gamundi B.M.

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Abstract :

The quality of the habitat applies various terms among which are comfort with contibutive factors such as temperature, humidity, air purity, among others. In the present work, a design of a forced extraction system was carried out for an area that requires air renewal for academic use and rapid calculation. The model was corroborated with an experimental system finding that there is a similarity of 95.5%.

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3

Title : Approximation Method of Tool Path Oriented to Five-axis CNC Machining with NURBS Curve

Authors : Chen Liangji, Li Huiying

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Abstract :

For the case of the advancement of Non-Uniform Rational B-Spline (NURBS) curve to represent a complex freeform shape, the NURBS method has been applied in Computer Numerical Control (CNC) machine tools to express the tool path curve. In order to achieve higher approximation accuracy in five-axis CNC machining, the approximation principle was firstly proposed based on the time division and the tool path curve was approximated by a group of chord lines. To avoid the federate fluctuation, the federate correction method is also proposed. The relation methods for realizing the approximation of tool path curve was also presented in this paper. The given example and the cutting result show that the proposed methods are feasibility of being applied to CNC trajectory approximation to achieve high-speed and high-accuracy multi-axis machining.

8-13
4

Title : Research on structural response when it is impacted

Authors : Ling Wang, Xiang Jiang, Lei Huang

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Abstract :

In this chapter, the collision process of two submersible vehicles is numerically simulated by finite element analysis method. Taking the crashed submersible as the research object, the collision response of the crashed submersible under the influence of collision parameters is considered.

14-18
5

Title : Optimal Cropping Pattern For Dhanshiri Basin For Food Sustainability

Authors : Jahanur Rahman, Bibhash Sarma

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Abstract :

The Dhanshiri basin is a south bank sub-basin of Brahmaputra basin. Major crop seasons are Kharif and Rabi having cropping intensity 90% and 25% respectively. The large difference of cropping intensities between the crop seasons results a vast area lying unused during Rabi season. The basin requires yearly production of food crops 508,383 MT against current production of 38,553 MT. This is due to disproportionate crop area distribution and as a result the basin has been suffering from food crisis for a long time. The basin can be food sustainable only by changing cropping pattern with limited land and water resources. Linear Programming (LP) model for maximization of economic benefit is used to suggest an optimal cropping pattern supported by ground water irrigation system, which satisfies the rice, protein and calorie requirements up to the year 2050; protects farmers’ affinity towards certain crops and market limitations of certain crops. The ground water availability for irrigation purpose is assessed and fed to the model as input.  Different cases are considered for the model to arrive at a logical decision.

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6

Title : Design of a high and low pair fusion lower limb exoskeleton robot

Authors : Shufeng Tang, Jianguo Cao, Zirui Guo

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Abstract :

In this paper, a new structure of a lower extremity exoskeleton robot is proposed, the knee joint of which adopts a five-link gear mechanism to complete the transmission, thus realizing a multi-center rotational motion at the knee. By establishing the kinematic model and dynamic model of this robot, this paper provides a theoretical analysis of the proposed structure and uses MATLAB to solve the motion trajectory of the ankle joint in the spatial sagittal plane to verify the correctness of the kinematic model. Based on the simulation analysis of the human–machine system model performed in ADAMS, the torque characteristics and rotational speed characteristics of each joint motor deceleration module are solved. Furthermore, the simulation results are compared with the theoretical results to verify the correctness of the dynamic model, and the theoretical basis is provided for the implementation of the concrete prototype experiment of the lower extremity exoskeleton robot. text alignment should be justified. References and Author’s Profile must be in Font Size 8, Hanging 0.25 with single line spacing.

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7

Title : Two Regularization Methods Simultaneous Determination of Initial Value and the Source Term of the Heat Conduction Problem

Authors : Xue-Juan Ren, Cheng-Bo Jin

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Abstract :

In this paper, we investigate the inverse problem of determining a heat source and initial temperature simultaneously in a parabolic equation. Since, it is an ill-posed problem, we use the mollification method to solve  source and  use the modified method to solve initial value. And we obtain an optimal error estimate from an a priori parameter choice rule. Finally, two examples show that the proposed method is effective and efficient.

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8

Title : Teachers Perceptions on Teaching English in Government Upper Primary Schools of Dohad District

Authors : Dr. Anil R Patel

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Abstract :

English teaching in Upper Primary Schools in tribe areas of India is always a challenging task and has much more debated amongst educationalist, researchers and teachers. The present article aims to suggest solutions of English teaching problems in Dohad District of Gujarat state at Government Upper Primary Schools by surveying teachers` perceptions on factors such as: government policy on English teaching, psychological problems, mother tongue influence, English teaching skills and competences, environmental and cultural issues. The structured questionnaires are administered to English teachers (N= 261, n= 132, v=48) in context to Dohad District as source of primary data collection. The collected data are analyzed and tested using IBMSPSS.22 as a statistical tool to identify correlations amongst Government policy, psychological problems, mother tongue influence, English teaching skills and competences, environmental and cultural issues. The results reveal on positive correlations amongst all the factors considered for the survey.

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9

Title : Effect of the combination of Mode of training and Business location on product quality: The Case Study of Arc Welding in Small Scale Metalworking Enterprises in Kenya

Authors : Charles M.M. Ondieki

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Abstract :

The quality of products from the micro and small enterprise sector is affected by both the entrepreneur’s and enterprise’s attributes. This paper presents and discusses findings of a study that was designed to investigate experimentally the relationship between the quality of arc welding in the Small Scale Metalwork sub-sector and the combined effect of the artisan’s mode of training and business location. A total of 36 artisans with secondary education and 36 artisans with primary education consisting of formally (35) and informally (37) trained artisans from urban (29 artisans) and rural (43 artisans) areas participated in the evaluation. A mild steel product was fabricated by each participating artisan, assessed and scores awarded based on the quality of arc welding. The analysis of variance (ANOVA) was used to show any variation in the quality of arc welding; comparisons of means using the Least Significant Difference (LSD) at the alpha level of 5% were done to determine which pairs of artisans affected quality significantly. The study found out that informally trained artisans working in urban areas exhibited the highest quality of arc welding. The informally trained artisans working in rural areas exhibited the lowest quality of arc welding. The study found out that artisans from urban areas performed better than those from rural areas. Generally, formal training does not have a significant effect on urban artisans, but it does improve product quality of arc welding from rural artisans. The findings of the study provide evidence that formal training can improve product quality from artisans working in rural areas, and therefore more resources should be channeled to training of rural artisans.

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10

Title : Production of Fiber From Mesquite Plant (prosopis juliflora. L)

Authors : Howayda M. Mohammed, Taiseer Hassan M., Ahmed A. A. Youssif

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Abstract :

The aim of this study is to investigate the chemical content of mesquite (prosopis juliflora) stalk, and the potential use in manufacture of sustainable fiber reinforced polymer composite, papermaking, plastics and textile industry. The raw mesquite stalk has 69% cellulose, 8% hemicelluloses, 0.53% lignin and 11.19% moisture content. The proportion of minerals in the samples were estimated by  Inductively Coupled Plasma  Emission (ICPE) spectrometer, the minerals in  μg/L were,  24 Cu , 1.6  B , 70  Ca, ,42 Fe, 83 I, 1.5 K, 70 Mg, 1.1 Mn, 12 Na, 250 P, 15 Pb, 50 S,  26 Si and Ba  concentration is less than μg/L. The production of vegetable fibers from the prosopis juliflora stalk was done through chemical extraction and water treatment. The produced fibers have 67% Cellulose, 5.47% lignin, 7.20% hemicelluloses and 0.09% ash. The fibers characterized by Fourier Transform infrared spectroscopy (FTIR), Density, porosity and Tensile strength. The density of the fiber was 0.50 g/cm3 and porosity 0.671. The FTIR spectrum show peaks at 3423.76, 2920.32, 781.20 and 1425.44 cm-1, attributed to O–H stretching, C–H stretching, C-O stretching and deformation vibrations of CH2 and CH groups respectively. The Tensile strength for three samples and elongation for each sample, were 1.09 kg, 3.76 kg , 1 kg, and elongation 1.09% , 1.03% , 0.56%   respectively. The Morphological investigation was carried out using   scanning electron microscope (SEM) and identifying elements zoom in 20 μm. By analyzing cross section of the sample, it was found to contain 80.6% oxygen and 19.4% calcium. 

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11

Title : A Unitary Quantum Walk Constructed Directly from Quantum Bernoulli Noises

Authors : Yin Zhang, Caishi Wang, Jia Shi, Lixia Zhang

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In this paper, we present a new model of quantum walk, which is constructed directly from quantum Bernoulli noises. We examine its basic properties, and two representation results are obtained of the walk.

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12

Title : Impact of High Pressure Rotorvane on CTC Black Tea Quality

Authors : Cosmas K. Langat, Abel N. Mayaka, Charles M. M. Ondieki

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Abstract :

Conventional black tea is produced using variety of tea leaves called Camellia sinensis (species of evergreen shrub or small tree whose leaves and leaf buds are used to produce black tea). Black tea processing production involve plucking, withering, maceration/rolling, cutting, oxidation/fermentation and drying. In the conventional black tea process, CTC (Cutting, Tearing and Curling) is where tea leaves are cut to rapture plant cells so as to release catechins for oxidation / fermentation for 2 hours before being stopped in the dryer at a temperature of 130O C. The CTC tea manufacturing process produces high quality teas. High pressure Rotorvane has been designed for processing of Orthodox teas [1] by converting standard Rotorvane from Low to high Pressure [2] and tested to produce Orthodox Large Particle Tea that is able to infuse like normal conventional black CTC teas [3]. To check impact of high pressure Rotorvane on CTC black tea, factory trials were done using 15'' Rotorvane at different pressures and were then tracked through the innovation manufacturing process. Made tea samples for each trial were drawn and assessed by tea tasters for quality using the Unilever International Tea Categorisation System (ITCS) and quality comparisons made. It was found out that the higher the Rotorvane pressure the higher the quality of CTC made tea to an optimum level of 25MN/m2 on quality parameters of Taste, Colour and Mouthfeel giving a taste score of 5.4 which is 0.4 above conventional CTC made tea quality of 5.0. Leaf appearance score remained the same at 5. From the conclusion obtained, high pressure Rotorvane should be used as a standard equipment in the processing of high-quality CTC teas in the Tea industry.

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13

Title : Effect of Non-Uniformity of Subgrade Soil on Asphalt Pavement Performance (A Case Study of Qena-Luxor West Desert Road)

Authors : Dr. Hassan Darwish Hassanin

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Abstract :

The subgrade soil bearing capacity represented by its Modulus of Resilient (Mr) or California Bearing Ratio (CBR) is considered the most dependent factor in all methods of pavement design. The structural failure and the performance of the pavement are greatly related to the subgrade soil conditions. All researchers accepted that the subgrade soils under the pavements are not perfectly homogeneous because of different conditions are existing in the field including environmental, geological, water table and construction conditions. A major factor that affects the pavement performance is the non-uniformity of subgrade soil type along the road section due to the existence of various soil types in some special areas. This study was conducted based on the collected geotechnical, traffic and pavement condition data of the project of dualization of Qena – Luxor west desert road 50 km length. The road project consists of two road sections; Qena – Al Mahrosa 14 km & Al Mahrosa – Al Taref 36 km. The objective of this study is to investigate the effect of non-uniformity of subgrade soil type on the pavement performance of the constructed pavement. The investigation program included pavement surface condition and geotechnical & Laboratory investigations for the existing road bed soils. Results indicated that the performance of the pavement is greatly affected by the change of the subgrade bearing capacity due to changes in soil types. By checking the correlation between the pavement performance represented by PCI values and the subgrade bearing capacity represented by its CBR, it is found that the R2 value for the predicted linear relationship is 0.6281 which does not justified due to the existence of many other factors affects the pavement performance in addition to the subgrade bearing capacity.

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14

Title : Estimation the parameters of Odd Generalized Exponential-Gompertez distribution

Authors : Abeer S.Mohamed, Amira A. Elghany

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In this paper, an odd generalized exponential-Gompertz (OGE-G) distribution which is capable of life tables to calculate death rates (failure) are considered. Based on simulated data from the OGE-G distribution, the problem of estimation of parameters under classical and Bayesian approaches are calculated. In this regard, the maximum likelihood estimates, and Bayes estimates under squared error loss function are obtained.  Also 95% asymptotic confidence interval and highest posterior density interval estimates are calculated. The Monte Carlo simulation will be conduct to study and compare the performance of the various proposed estimators.

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