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Electronic Properties of NdOs4Sb12 NdOs4Sb12的电子性质
4区 材料科学
Advances in Materials Science and Engineering Pub Date : 2007-12-06 DOI: 10.1155/2007/29717
D. Galván
{"title":"Electronic Properties of NdOs4Sb12","authors":"D. Galván","doi":"10.1155/2007/29717","DOIUrl":"https://doi.org/10.1155/2007/29717","url":null,"abstract":"Theoretical calculations on NdOs4Sb12-filled skutterudite are reported. The calculated energy bands yield indication of a semimetallic behavior, while the projected density of states provides support for the existence of hybridization formed by Nd f-, Os d-, and Sb p-states.","PeriodicalId":7345,"journal":{"name":"Advances in Materials Science and Engineering","volume":"2007 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2007-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2007/29717","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64146566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Flow Characteristics of Gas and Liquid through a Cell Porous Disk 气体和液体通过多孔板的流动特性
4区 材料科学
Advances in Materials Science and Engineering Pub Date : 2007-12-05 DOI: 10.1155/2007/52576
Y. Hirano, K. Takeda, Testuya Yano, S. Kumagai, S. Sudo
{"title":"Flow Characteristics of Gas and Liquid through a Cell Porous Disk","authors":"Y. Hirano, K. Takeda, Testuya Yano, S. Kumagai, S. Sudo","doi":"10.1155/2007/52576","DOIUrl":"https://doi.org/10.1155/2007/52576","url":null,"abstract":"This paper describes applications of cell porous materials. The authors investigated the flow characteristics of a gas-liquid mixture in a rotating porous disk. For theoretical analyses, the gas is assumed to permeate the entire disk surface. A simple one-dimensional model illustrates that the residence time of the liquid is much greater than that of the gas. Violent interaction in small cells is likely to enhance the chemical reaction between gas and liquid. Cell porous materials might also be exploited for chemical reaction purposes.","PeriodicalId":7345,"journal":{"name":"Advances in Materials Science and Engineering","volume":"2007 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2007-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2007/52576","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64151005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Strain-Hardening and Fracture Behavior of Die Cast Magnesium Alloy AM50 压铸镁合金AM50的应变硬化及断裂行为
4区 材料科学
Advances in Materials Science and Engineering Pub Date : 2007-11-29 DOI: 10.1155/2007/64195
Zhizhong Sun, Ming Zhou, Henry Hu, Naiyi Li
{"title":"Strain-Hardening and Fracture Behavior of Die Cast Magnesium Alloy AM50","authors":"Zhizhong Sun, Ming Zhou, Henry Hu, Naiyi Li","doi":"10.1155/2007/64195","DOIUrl":"https://doi.org/10.1155/2007/64195","url":null,"abstract":"Understanding tensile and fracture behaviors of die cast magnesium alloys is of importance for proper design of various emerging automotive applications. In the present study, magnesium alloy AM50 was high pressure die cast into rectangular coupons with section thicknesses of 2, 6, and 10 mm. Effect of section thicknesses on strain-hardening and fracture behaviors of the die cast AM50 was investigated. The results of tensile testing indicate that the tensile properties including yield strength (YS), ultimate tensile strength (UTS), and elongation (Ef) decrease with increasing section thicknesses of die cast AM50. The analysis of true stress versus strain curves shows that the straining hardening rates during the plastic deformation of the alloy increase with decreasing section thicknesses. The observation via SEM fractography illustrates that the fracture behavior of die cast AM50 is influenced by section thicknesses. As the section thickness increases, the fracture of AM50 tends to transit from ductile to brittle mode due to increasing porosity content and coarsening microstructure.","PeriodicalId":7345,"journal":{"name":"Advances in Materials Science and Engineering","volume":"2007 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2007-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2007/64195","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64153472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Unsteady Growth of BaB2O4 Single Crystal from High-Temperature Solution 高温溶液中BaB2O4单晶的不稳定生长
4区 材料科学
Advances in Materials Science and Engineering Pub Date : 2007-11-25 DOI: 10.1155/2007/61395
X. Pan, W. Jin, Y. Jiang, Y. Liu, F. Ai
{"title":"Unsteady Growth of BaB2O4 Single Crystal from High-Temperature Solution","authors":"X. Pan, W. Jin, Y. Jiang, Y. Liu, F. Ai","doi":"10.1155/2007/61395","DOIUrl":"https://doi.org/10.1155/2007/61395","url":null,"abstract":"Two-dimensional growth of BaB2O4 single crystal from high-temperature solution was performed, and the motion \u0000of solid-liquid interface was observed in real time by differential interference microscopy. Results show that the solid-liquid \u0000interface exhibits the morphology of a vicinal face where steps with height of several microns are observed. The \u0000measurements of growth rate V and step propagating velocity υ show that both V and υ fluctuate by up to 40∼50% of \u0000their average values, respectively, under constant external conditions. Such intrinsic fluctuations with time interval of the \u0000order of one second is mainly the result of step bunching, which has been confirmed by the gradual decrease of step \u0000spacing when approaching the edge of the growing interface. Besides above fluctuations, a longer-period oscillation of \u0000V (period interval of 4∼5 seconds) is obtained for relatively rapid growth, which is triggered by the periodical alteration of step \u0000propagating directions.","PeriodicalId":7345,"journal":{"name":"Advances in Materials Science and Engineering","volume":"2007 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2007-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2007/61395","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64153009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Some Material Characteristics of Cold-Sprayed Structures 冷喷涂结构的一些材料特性
4区 材料科学
Advances in Materials Science and Engineering Pub Date : 2007-11-22 DOI: 10.1155/2007/27347
V. Champagne, D. Helfritch, M. Trexler
{"title":"Some Material Characteristics of Cold-Sprayed Structures","authors":"V. Champagne, D. Helfritch, M. Trexler","doi":"10.1155/2007/27347","DOIUrl":"https://doi.org/10.1155/2007/27347","url":null,"abstract":"The deposition and consolidation of metal powders by means of cold spray are methods whereby powder particles are accelerated to high velocity through entrainment in a gas undergoing expansion in a rocket nozzle and are subsequently impacted upon a surface. The impacted powder particles form a consolidated structure which can be several centimeters thick. The characteristics of this structure depend on the initial characteristics of the metal powder and upon impact velocity. The influence of impact velocity on strain hardening and porosity are examined. A materials model is proposed for these phenomena, and model calculation is compared with experiment for the cold spraying of aluminum.","PeriodicalId":7345,"journal":{"name":"Advances in Materials Science and Engineering","volume":"2007 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2007-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2007/27347","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64146401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
RF Power and Thermal Annealing Effect on the Properties of Zinc Oxide Films Prepared by Radio Frequency Magnetron Sputtering 射频功率和热退火对射频磁控溅射制备氧化锌薄膜性能的影响
4区 材料科学
Advances in Materials Science and Engineering Pub Date : 2007-11-20 DOI: 10.1155/2007/26459
Chaoyang Li, M. Furuta, T. Matsuda, T. Hiramatsu, H. Furuta, T. Hirao
{"title":"RF Power and Thermal Annealing Effect on the Properties of Zinc Oxide Films Prepared by Radio Frequency Magnetron Sputtering","authors":"Chaoyang Li, M. Furuta, T. Matsuda, T. Hiramatsu, H. Furuta, T. Hirao","doi":"10.1155/2007/26459","DOIUrl":"https://doi.org/10.1155/2007/26459","url":null,"abstract":"Polycrystalline zinc oxide (ZnO) films were prepared by radio frequency (RF) magnetron \u0000sputtering under different powers. The XRD results showed that ZnO crystallite size along \u0000c-axis decreased by 43% with deposition power increased from 60 W \u0000to 300 W, increased 36% with annealing temperature rising to 400 ∘ C . TDS \u0000measurement revealed that the desorption peaks of both atomic Zn (60 W-deposited) \u0000and oxygen molecule (180 W and 300 W-deposited) obtained from ZnO films were \u0000originated from 300 ∘ C . When annealing temperature was higher than 300 ∘ C , the sheet \u0000resistance dramatically decreased, and compressive stress in the (002) plane changed to \u0000tensile stress as well. The comparison measurements of ZnO films crystallinity strongly \u0000suggested that both lower deposition power and certain thermal annealing temperature \u0000over 300 ∘ C would contribute to the formation of high quality ZnO films.","PeriodicalId":7345,"journal":{"name":"Advances in Materials Science and Engineering","volume":"2007 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2007-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2007/26459","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64146168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Low Dark Current Mesa-Type AlGaN Flame Detectors 低暗电流台面型海藻火焰探测器
4区 材料科学
Advances in Materials Science and Engineering Pub Date : 2007-11-18 DOI: 10.1155/2007/62825
Lung-Chien Chen
{"title":"Low Dark Current Mesa-Type AlGaN Flame Detectors","authors":"Lung-Chien Chen","doi":"10.1155/2007/62825","DOIUrl":"https://doi.org/10.1155/2007/62825","url":null,"abstract":"This study characterizes and reports on the fabrication process of AlGaN flame photodetectors with an Al0.1Ga0.9N/GaN superlattice structure. The AlGaN flame photodetectors exhibited a low dark current (∼1.17×10−10 A at bias of −5 V) and large rejection ratio of photocurrent (∼2.14×10−5 A at bias of -5 V) to dark current, which is greater than five orders of magnitude. Responsivity at 350 nm at a bias of -5 V was 0.194 A/W. Quantum efficiency, η, was 0.687 at a reverse bias of 5 V.","PeriodicalId":7345,"journal":{"name":"Advances in Materials Science and Engineering","volume":"2007 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2007-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2007/62825","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64153790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characterizations of Polystyrene-Based Hybrid Particles Containing Hydrophobic Mg(OH)2 Powder and Composites Fabricated by Employing Resultant Hybrid Particles 含疏水性Mg(OH)2粉末的聚苯乙烯基杂化颗粒及其复合材料的表征
4区 材料科学
Advances in Materials Science and Engineering Pub Date : 2007-10-30 DOI: 10.1155/2007/19232
S. Kimura, T. Hyodo, Y. Shimizu, M. Egashira
{"title":"Characterizations of Polystyrene-Based Hybrid Particles Containing Hydrophobic Mg(OH)2 Powder and Composites Fabricated by Employing Resultant Hybrid Particles","authors":"S. Kimura, T. Hyodo, Y. Shimizu, M. Egashira","doi":"10.1155/2007/19232","DOIUrl":"https://doi.org/10.1155/2007/19232","url":null,"abstract":"Polystyrene (PS)-based hybrid particles containing a large amount of Mg(OH)2 powder treated with methylhydrogen polysiloxane (MHS) were fabricated by a bulk and subsequent suspension two-step polymerization method. All the particles fabricated showed spherical shape and their particle sizes were about 500 μm, irrespective of the additive amount of the Mg(OH)2 powder modified with MHS (ST-1). The actual content of ST-1 powder incorporated inside each kind of hybrid particle was almost the same as that in the raw mixture, and agglomeration of ST-1 powder was hardly observed inside the hybrid particles. The compressive strength of the hybrid particles remained almost unchanged, even when the ST-1 powder content increased from 10 to 50 phr. Furthermore, a composite fabricated by employing the hybrid particles achieved homogenous distribution of ST-1 powder and showed a higher oxygen index than that of a composite fabricated by directly mixing of PS pellets and ST-1 powder.","PeriodicalId":7345,"journal":{"name":"Advances in Materials Science and Engineering","volume":"2007 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2007-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2007/19232","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64140335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ultralight-Weight Cellulose Aerogels from NBnMO-Stabilized Lyocell Dopes 由nbnmo稳定Lyocell Dopes制备的超轻质纤维素气凝胶
4区 材料科学
Advances in Materials Science and Engineering Pub Date : 2007-10-29 DOI: 10.1155/2007/73724
F. Liebner, A. Potthast, T. Rosenau, E. Haimer, M. Wendland
{"title":"Ultralight-Weight Cellulose Aerogels from NBnMO-Stabilized Lyocell Dopes","authors":"F. Liebner, A. Potthast, T. Rosenau, E. Haimer, M. Wendland","doi":"10.1155/2007/73724","DOIUrl":"https://doi.org/10.1155/2007/73724","url":null,"abstract":"Cellulose aerogels are intriguing new materials produced by supercritical drying of regenerated cellulose obtained by solvent exchange of solid Lyocell moldings. From N-methylmorpholine-N-oxide solutions with cellulose contents between 1 and 12%, dimensionally stable cellulose bodies are produced, in which the solution structure of the cellulose is largely preserved and transferred into the solid state. The specific density and surface of the obtained aerogels range from 0.05 to 0.26 g/cm3 and from 172 to 284 m2/g, respectively, depending on the cellulose content of the Lyocell dopes and regeneration procedure. A reliable extraction and drying procedure using supercritical carbon dioxide, the advantageous use of NBnMO as stabilizer for the Lyocell dopes, and selected physical properties of the materials is communicated.","PeriodicalId":7345,"journal":{"name":"Advances in Materials Science and Engineering","volume":"2007 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2007-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2007/73724","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64155917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
Processability of Pultrusion Using Natural Fiber and Thermoplastic Matrix 天然纤维和热塑性塑料基体拉挤的可加工性
4区 材料科学
Advances in Materials Science and Engineering Pub Date : 2007-10-25 DOI: 10.1155/2007/37123
T. Nguyen-Chung, K. Friedrich, G. Mennig
{"title":"Processability of Pultrusion Using Natural Fiber and Thermoplastic Matrix","authors":"T. Nguyen-Chung, K. Friedrich, G. Mennig","doi":"10.1155/2007/37123","DOIUrl":"https://doi.org/10.1155/2007/37123","url":null,"abstract":"Fundamental mechanisms of the pultrusion process using commingled yarns of polypropylene matrix and discontinuous \u0000 flax fiber to produce thermoplastic profiles were investigated in numerical and experimental manners. Essential issue is the \u0000 fact that all natural fibers are discontinuous by nature, which may negatively influence the processability. The pultrusion \u0000 process will be only successful if the pulling force exerted on the solidified pultrudates can be transmitted to the regions of \u0000 unmelted commingled yarns by “bridging over” those melted regions within the die. This can be realized by applying \u0000 a sufficient number of small yarn bundles of high compactness rather than a thicker single bundle of lower compactness \u0000 as the raw material. Furthermore, the possibility of adding extra melt into the yarn bundles by side-fed extrusion has been \u0000 investigated showing that the impregnation can be improved only for the outer layers of yarns, which is owed to the high \u0000 viscosity of the thermoplastic melt and the limited length of the die.","PeriodicalId":7345,"journal":{"name":"Advances in Materials Science and Engineering","volume":"2007 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2007-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2007/37123","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64148224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
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