Journal: Materials最新文献_第8页

Synthesis and Characterization of LPCVD Polysilicon and Silicon Nitride Thin Films for MEMS Applications 用于MEMS的LPCVD多晶硅和氮化硅薄膜的合成和表征

Journal: Materials Pub Date : 2014-04-14 DOI: 10.1155/2014/954618

N. Sharma, M. Hooda, S. Sharma

引用次数: 37

A Reconciliation of Packed Column Permeability Data: Column Permeability as a Function of Particle Porosity 填充柱渗透率数据的调和:柱渗透率作为颗粒孔隙度的函数

Journal: Materials Pub Date : 2014-04-01 DOI: 10.1155/2014/636507

H. Quinn

{"title":"A Reconciliation of Packed Column Permeability Data: Column Permeability as a Function of Particle Porosity","authors":"H. Quinn","doi":"10.1155/2014/636507","DOIUrl":"https://doi.org/10.1155/2014/636507","url":null,"abstract":"In his textbook teaching of packed bed permeability, Georges Guiochon uses mobile phase velocity as the fluid velocity term in his elaboration of the Darcy permeability equation. Although this velocity frame makes a lot of sense from a thermodynamic point of view, it is valid only with respect to permeability at a single theoretical boundary condition. In his more recent writings, however, Guiochon has departed from his long-standing mode of discussing permeability in terms of the Darcy equation and has embraced the well-known Kozeny-Blake equation. In this paper, his teaching pertaining to the constant in the Kozeny-Blake equation is examined and, as a result, a new correlation coefficient is identified and defined herein based on the velocity frame used in his teaching. This coefficient correlates pressure drop and fluid velocity as a function of particle porosity. We show that in their experimental protocols, Guiochon et al. have not adhered to a strict material balance of permeability which creates a mismatch of particle porosity and leads to erroneous conclusions regarding the value of the permeability coefficient in the Kozeny-Blake equation. By correcting the experimental data to properly reflect particle porosity we reconcile the experimental results of Guiochon and Giddings, resulting in a permeability reference chart which is presented here for the first time. This reference chart demonstrates that Guiochon’s experimental data, when properly normalized for particle porosity and other related discrepancies, corroborates the value of 267 for the constant in the Kozeny-Blake equation which was derived by Giddings in 1965.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"48 1","pages":"1-22"},"PeriodicalIF":0.0,"publicationDate":"2014-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82169794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

The Construction of the Dupin Cyclides in a Smectic A Polygonal Texture 单晶a多边形纹理中Dupin圈的构造

Journal: Materials Pub Date : 2014-03-30 DOI: 10.1155/2014/145375

Claire Meyer, Brice Jonckheere, Coline Penaud

引用次数: 2

Effect of Sn Addition on Thermal and Optical Properties of Glass 添加锡对玻璃热光学性能的影响

Journal: Materials Pub Date : 2014-03-27 DOI: 10.1155/2014/318262

V. Modgil, V. S. Rangra

引用次数: 19

Synthesis and Characterization of Aluminum Doped Zinc Oxide Nanostructures via Hydrothermal Route 水热法制备掺铝氧化锌纳米结构及表征

Journal: Materials Pub Date : 2014-03-25 DOI: 10.1155/2014/235638

A. Al-Kahlout, N. Dahoudi, I. Grobelsek, M. Jilavi, P. Oliveira

引用次数: 41

Structural Lightweight Concrete Production by Using Oil Palm Shell 利用油棕壳生产结构轻量化混凝土

Journal: Materials Pub Date : 2014-03-20 DOI: 10.1155/2014/870247

Habibur Rahman Sobuz, Noor Md. Sadiqul Hasan, N. Tamanna, M. S. Islam

{"title":"Structural Lightweight Concrete Production by Using Oil Palm Shell","authors":"Habibur Rahman Sobuz, Noor Md. Sadiqul Hasan, N. Tamanna, M. S. Islam","doi":"10.1155/2014/870247","DOIUrl":"https://doi.org/10.1155/2014/870247","url":null,"abstract":"Conventional building materials are widely used in a developing country like Malaysia. This type of material is costly. Oil palm shell (OPS) is a type of farming solid waste in the tropical region. This paper aims to investigate strength characteristics and cost analysis of concrete produced using the gradation of OPS 0–50% on conventional coarse aggregate with the mix proportions 1 : 1.65 : 2.45, 1 : 2.5 : 3.3, and 1 : 3.3 : 4.2 by the weight of ordinary Portland cement, river sand, crushed stone, and OPS as a substitution for coarse aggregate. The corresponding w/c ratios were used: 0.45, 0.6, and 0.75, respectively, for the defined mix proportions. Test results indicate that compressive strength of concrete decreased as the percentage of the OPS increased in each mix ratio. Other properties of OPS concrete, namely, modulus of rupture, modulus of elasticity, splitting tensile strength, and density, were also determined and compared to the corresponding properties of conventional concrete. Economic analysis also indicates possible cost reduction of up to 15% due to the use of OPS as coarse aggregate. Finally, it is concluded that the use of OPS has great potential in the production of structural lightweight concrete.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"144 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2014-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77520739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 27

Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion 乙基羟乙基纤维素对低碳钢腐蚀的酸缓蚀及吸附行为

Journal: Materials Pub Date : 2014-03-13 DOI: 10.1155/2014/101709

I. Arukalam, I. O. Madu, N. T. Ijomah, C. Ewulonu, G. N. Onyeagoro

{"title":"Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion","authors":"I. Arukalam, I. O. Madu, N. T. Ijomah, C. Ewulonu, G. N. Onyeagoro","doi":"10.1155/2014/101709","DOIUrl":"https://doi.org/10.1155/2014/101709","url":null,"abstract":"The corrosion inhibition of mild steel in 1.0 M H2SO4 solution by ethyl hydroxyethyl cellulose has been studied in relation to the concentration of the additive using weight loss measurement, EIS, polarization, and quantum chemical calculation techniques. The results indicate that EHEC inhibited corrosion reaction in the acid medium and inhibition efficiency increased with EHEC concentration. Further increase in inhibition efficiency is observed in the presence of iodide ions, due to synergistic effect. Impedance results reveal that EHEC is adsorbed on the corroding metal surface. Adsorption followed a modified Langmuir isotherm, with very high negative values of the free energy of adsorption . The polarization data indicate that the inhibitor was of mixed type, with predominant effect on the cathodic partial reaction. The frontier molecular orbitals, HOMO (the highest occupied molecular orbital) and LUMO (the lowest unoccupied molecular orbital) as well as local reactivity of the EHEC molecule, were analyzed theoretically using the density functional theory to explain the adsorption characteristics at a molecular level. The theoretical predictions showed good agreement with experimental results.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"37 1","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84924672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 32

Synthesis and Characterization of Optically Active Fractal Seed Mediated Silver Nickel Bimetallic Nanoparticles 光活性分形种子介导的银镍双金属纳米粒子的合成与表征

Journal: Materials Pub Date : 2014-03-11 DOI: 10.1155/2014/184216

J. A. Adekoya, E. O. Dare, M. Mesubi, N. Revaprasadu

引用次数: 11

Fabrication of Thermoelectric Sensor and Cooling Devices Based on Elaborated Bismuth-Telluride Alloy Thin Films 基于精细碲化铋合金薄膜的热电传感器及冷却装置的制备

Journal: Materials Pub Date : 2014-03-10 DOI: 10.1155/2014/430410

A. Boulouz, A. Giani, B. Sorli, L. Koutti, A. Massaq, F. Pascal-Delannoy

引用次数: 6

Investigating the Physical Properties of Sintered Alumina in the Presence of MgO Nanopowder 纳米氧化镁粉末存在下烧结氧化铝的物理性质研究

Journal: Materials Pub Date : 2014-03-05 DOI: 10.1155/2014/496146

M. Dadkhah, A. Saboori, M. Jafari

引用次数: 13