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Study on the Radial Vibration of a Thin Annular Vibrator with Multi-Radial Slots
Liu Shiqing,
Ma Leilei,
Liu Yifeng,
Li Dan,
Chen Zhaojiang
Issue:
Volume 5, Issue 1, March 2019
Pages:
1-5
Received:
31 December 2018
Accepted:
21 January 2019
Published:
28 March 2019
Abstract: The radial vibration of a thin annular vibrator with multiple radial slots is studied. Based on the electro-mechanical analogy, the equivalent circuit and the frequency equation of the slotting thin annular vibrator in radial vibration are derived. By numerical simulations, the influences of the radius ratio of the thin annular vibrator on its displacement amplitude amplification factor and the first- and the second-order resonance frequency have been investigated. The analysis results manifest that the first-order amplitude amplification factor and the resonance frequency of the ring increase with the increases of the radius ratio, and the situation is the opposite for the relation between the second-order amplitude amplification factor and the radius ratio. The Finite Element Method (FEM) is employed for the simulation of the radial vibration of the thin annular vibrator. The FEM results are in good agreement with the analytical solution.
Abstract: The radial vibration of a thin annular vibrator with multiple radial slots is studied. Based on the electro-mechanical analogy, the equivalent circuit and the frequency equation of the slotting thin annular vibrator in radial vibration are derived. By numerical simulations, the influences of the radius ratio of the thin annular vibrator on its disp...
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Innovation Method of Distributed Storage for Huge Data of Geological and Mineral Resources Based on Hadoop
Li Chaokui,
Zhao Yanan,
Xiao Keyan,
Chen Jianhui
Issue:
Volume 5, Issue 1, March 2019
Pages:
6-16
Received:
24 January 2019
Accepted:
4 March 2019
Published:
28 March 2019
Abstract: With the emergence of big data of TB and PB geological and mineral resources, the storage of large geological data has become a worldwide problem puzzling geologists. The traditional storage and service model of geological data is facing a great challenge. For example, when the scale of data increases dramatically, general relational database can not solve the problem of insufficient scalability, stability and efficiency of database system. In response to the above problems, this paper proposes a new method of geological and mineral data storage based on cloud computing environment combined with hadoop. Taking the mineral resources potential evaluation data of Chongqing as the research object, The proposed method in this paper is compared with the traditional Oracle database storage method in data storage experiments: (1) Small file optimization comparative experiment; (2) Hadoop and Oracle comparative experiment. The performance of writing operation, memory occupancy, data import and data export are tested in different way, and the comparison chart of performance is given. The experimental results show that the new storage method proposed in this paper is more efficient than the traditional method. At the same time, it effectively overcomes the problem of small file storage in Hadoop storage. The research results provide a new technical for the storage and management of geological and mineral data all over the country.
Abstract: With the emergence of big data of TB and PB geological and mineral resources, the storage of large geological data has become a worldwide problem puzzling geologists. The traditional storage and service model of geological data is facing a great challenge. For example, when the scale of data increases dramatically, general relational database can n...
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Effect of Temperature on the Synthesis of Methyl Ester via the Transesterification of Waste Black Seed Oil and Castor Seed Oil Admixture
Bello Yunusa Makama,
Wahidullah Azizi,
Suraya Azizi,
Musbahu Rabiu
Issue:
Volume 5, Issue 1, March 2019
Pages:
17-20
Received:
29 October 2018
Accepted:
11 December 2018
Published:
13 April 2019
Abstract: There is an increasing attempt in biodiesel production (fatty acid methyl ester) because of the depleting fossil fuel resources as well as the similarity in properties when compared to those of diesel fuels. Engines set off on biodiesel have lower emissions of carbon monoxide, unburned hydrocarbons, and air toxics than engines runned on petroleum-based diesel fuel. We reported the optimization of Coconut oil methyl esters production via methyl ester from black oil/castor seed oils admixture under various operating conditions. The optimum yield, temperature, catalyst concentration and reaction time were found to be 93%, 60°C, 1.0% (wt of crude oil admixture) and 60 minutes respectively. Many fuel properties (viscosity, specific gravity and flash point) as measured according to standard methods, also found to conform to international standard.
Abstract: There is an increasing attempt in biodiesel production (fatty acid methyl ester) because of the depleting fossil fuel resources as well as the similarity in properties when compared to those of diesel fuels. Engines set off on biodiesel have lower emissions of carbon monoxide, unburned hydrocarbons, and air toxics than engines runned on petroleum-b...
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Application of Stimstream Shaped Charge with Consistent Entrance Hole and Deep Penetration in Shale Gas Reservoir
Wang Changshuan,
Guo Hongzhi,
Jiao Guandong,
Niu Yuanyuan,
Xie Mingzhao
Issue:
Volume 5, Issue 1, March 2019
Pages:
21-27
Received:
1 February 2019
Accepted:
1 April 2019
Published:
22 April 2019
Abstract: To address the issues of inefficient hydraulic fracturing on perforation clusters in shale gas horizontal wells caused by the inconsistent size of entrance holes on the casing, Stimstream shaped charge providing consistent hole and deep-penetration was introduced and its special performance was analyzed. Surface concrete target test and field test were conducted respectively to compare the performance between this kind of charge and conventional deep penetration charges made in China. In surface concrete target test, the average hole diameter of Stimstream shaped charge in 0°, 90°, 180°, 270° phasing is 9.4mm, 9.3mm, 9.3mm, 8.9mm, the average hole diameter of conventional deep penetration charges in 0°, 90°, 180°, 270° phasing is 9.3mm, 8.6mm, 6.5mm, 7.0mm respectively. The results shown that Stimstream shaped charge can provide uniform and big holes on the casing regardless of different clearance between perforating gun and casing. In three field testings, comparing the field data of S3406D Stimstream charge and domestic SDP35HMX25 shaped charges, it proven that S3406D can reduce the average hydraulic breakdown pressure by 2044.5 psi, 1189psi and 1261.5psi respectively, and reduce the average treatment pressure to pump proppant by 696psi, 652.5psi and 928psi respectively. It has remarkable effectiveness on reducing the breakdown pressure and treatment pressure of shale gas formations during hydraulic fracturing operation.
Abstract: To address the issues of inefficient hydraulic fracturing on perforation clusters in shale gas horizontal wells caused by the inconsistent size of entrance holes on the casing, Stimstream shaped charge providing consistent hole and deep-penetration was introduced and its special performance was analyzed. Surface concrete target test and field test ...
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A Manual Kinetic Assay in a Fixed Yeast Model for Drug Discovery
Vahe Nahapetyan,
Shiela Delos Santos,
Kristel Joy Crocker,
Dayana Tobar,
Dante Nazarian,
Hovannes Chirishyan,
Gerard Beltran,
Rachel Dubin,
Leticia Reque,
Prabkiran Singh,
Brandie Cardona,
Graciel Royce Bachinela,
Lillyt Sarkisyan,
Gregory Zem,
Steven Oppenheimer
Issue:
Volume 5, Issue 1, March 2019
Pages:
28-34
Received:
12 May 2019
Accepted:
10 June 2019
Published:
24 June 2019
Abstract: Manual cell counting assays are often considered as a gold standard in some applications because of direct observation of results. Here a manual kinetic cell counting method is used to evaluate the efficacy of reagents to unclump cells in a fixed yeast (Saccharomyces cerevisae) model. Clumped cells are more dangerous than single cells in many human venues such as cancer spread, thrombocytic blockages and biofilm infectivity. In this study percentage of single cells are analyzed over time in the presence or absence of specific reagents and the number of cell clumps and cells per clump are also assessed. The results show that when the percentage of single cells increases, the number of clumps and cells per clump decrease, helping to validate the assay. These findings suggest that this assay can be a gold standard for evaluating the effects of specific reagents on cell unclumping in a model system that can be used in drug discovery investigations. This study is part of a program that won a U.S. Presidential Award for science mentoring presented by President Obama at the White House. The experiments are easily accomplished by undergraduate students and can be done by research classes without background in complex science methodology.
Abstract: Manual cell counting assays are often considered as a gold standard in some applications because of direct observation of results. Here a manual kinetic cell counting method is used to evaluate the efficacy of reagents to unclump cells in a fixed yeast (Saccharomyces cerevisae) model. Clumped cells are more dangerous than single cells in many human...
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