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International Journal of Materials Science and Engineering最新文献

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A comparative study of Ni(II) with N-H, N-ō, S-ō, ō-ō donar atoms as secondary ligand Ni(II)与N- h, N- γ， S- γ， γ - γ donar原子作为二级配体的比较研究
International Journal of Materials Science and Engineering Pub Date : 2020-01-01 DOI: 10.22271/27078221.2020.v1.i1a.9
A. Kumari
{"title":"A comparative study of Ni(II) with N-H, N-ō, S-ō, ō-ō donar atoms as secondary ligand","authors":"A. Kumari","doi":"10.22271/27078221.2020.v1.i1a.9","DOIUrl":"https://doi.org/10.22271/27078221.2020.v1.i1a.9","url":null,"abstract":"In this paper a comparative study is carried out on binary, NiL 2 , and ternary NiAL complexes. Where A=2, 2 4 bipyridyl amine or 2.2 bipyridyl and L=N-N or N-Ō or S-Ō or Ō-Ō donating ligand. The order of stabilities of binary & ternary complexes is explained on the basicities of the ligand & ring size of the chelate. The sequence in order is explained in terms of M  L π interaction, size of chelate ring & steric factor. The same order is followed both by ternary complexes and binary","PeriodicalId":14103,"journal":{"name":"International Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74273037","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: 0
Formation, Dissociation and Equilibrium of Argon Clathrate Hydrate at Temperatures below Water Freezing Point 在低于冰点的温度下，氩气包合物水合物的形成、解离和平衡
International Journal of Materials Science and Engineering Pub Date : 2019-12-01 DOI: 10.17706/ijmse.2019.7.4.125-131
Kotaro Nemoto, H. Nagashima, R. Ohmura
{"title":"Formation, Dissociation and Equilibrium of Argon Clathrate Hydrate at Temperatures below Water Freezing Point","authors":"Kotaro Nemoto, H. Nagashima, R. Ohmura","doi":"10.17706/ijmse.2019.7.4.125-131","DOIUrl":"https://doi.org/10.17706/ijmse.2019.7.4.125-131","url":null,"abstract":"This paper reports three-phase (ice + hydrate + vapor) equilibrium temperature-pressure conditions in the argon clathrate hydrate forming system at temperatures below the freezing point of water. The thermodynamic model of air clathrate hydrate at temperatures below freezing point of water is required for the analysis of the past climate change using the ice core from the ice sheets at Antarctica and Greenland because the formation of air clathrate hydrate affect the gas composition of air bubbles. The precise phase equilibrium conditions in argon clathrate hydrate forming system should be took into account for the thermodynamic model of air hydrate. The equilibrium conditions were measured by the batch, isochoric procedure. The measured temperature range is from 197.6 K to 241.7 K and the corresponding equilibrium pressure range is from 0.825 MPa to 3.723 MPa. The internal consistency of the measured equilibrium data are investigated by applying the Clausius-Clapeyron equation.","PeriodicalId":14103,"journal":{"name":"International Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83628205","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: 0
Defect Detection of Carbon Fiber Composite by Eddy Current Sensor 基于涡流传感器的碳纤维复合材料缺陷检测
International Journal of Materials Science and Engineering Pub Date : 2019-12-01 DOI: 10.17706/ijmse.2019.7.4.96-101
X. Z. Zhang, Y. P. Huang
{"title":"Defect Detection of Carbon Fiber Composite by Eddy Current Sensor","authors":"X. Z. Zhang, Y. P. Huang","doi":"10.17706/ijmse.2019.7.4.96-101","DOIUrl":"https://doi.org/10.17706/ijmse.2019.7.4.96-101","url":null,"abstract":"Carbon fiber composite are used in various fields for its good properties, such as high strengthto-weight ratio and rigidity. In order to obtain high reliability of the composite, non-destructive detections are undertaken during fabrication and in application. An eddy current sensor was used to inspect defects in carbon fiber composite plates. The defects were drilled holes in various diameters through or not through the plates. Measurement data were analyzed to identify the positions and basic properties of the defects. Results has shown that less than 1 mm holes in diameter can be identified using a commercial 8 mm sensor for displacement measurement. Suggestions of further work were given.","PeriodicalId":14103,"journal":{"name":"International Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75177060","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: 0
Optimization of Metal Refinement Process by Selecting the Optimal Threshold Value 选择最佳阈值的金属细化工艺优化
International Journal of Materials Science and Engineering Pub Date : 2019-12-01 DOI: 10.17706/ijmse.2018.6.4.133-138
Thomas C. Chuang, Ful-Chiang Wu, Yachi Lee, F. Chou
{"title":"Optimization of Metal Refinement Process by Selecting the Optimal Threshold Value","authors":"Thomas C. Chuang, Ful-Chiang Wu, Yachi Lee, F. Chou","doi":"10.17706/ijmse.2018.6.4.133-138","DOIUrl":"https://doi.org/10.17706/ijmse.2018.6.4.133-138","url":null,"abstract":"The purpose of study is to find the optimal threshold value for metal refinement processes based on Taguchi loss function. Taguchi method is a widely employed methodology in many different industries for improving the performance of product/process. In Taguchi’s dynamic systems, if both input and output have only two digital values (0 and 1) with the possibility of committing two types of errors (judging 0 as 1 and 1 as 0), such a problem is called the digital system. Metal refinement processes can be viewed as a digital dynamic problem when the goal is to separate the metal molecules from the impurities. Molten metal stays at the bottom and the impurities float as slag on the top of molten metal. For this purpose, a threshold value R is required to discriminate molten metal from slag. A material is assessed as valuable metal or slag depending on the corresponding the output, which is affected by control factors and noise factors. If output is less than this threshold value R then may be considered slag and if value comes greater than or equal to threshold value R then considered valuable metal. Two types of error rate are occurred, p percent of metal molecules go into slag and q percent of a particular impurity go into the molten metal. This paper views the error rates as random variables with normal distributions and find the setting value of threshold R for the cases of loss coefficients are unequal.","PeriodicalId":14103,"journal":{"name":"International Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81861720","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: 0
Calorimetric Measurements on Ionic Semiclathrate Hydrate Formed with Tetrabutylammonium Sulfate (TBASO4) 四丁基硫酸铵(TBASO4)形成的半盐离子水合物的量热测定
International Journal of Materials Science and Engineering Pub Date : 2019-12-01 DOI: 10.17706/ijmse.2019.7.4.102-108
Ryo Koyama, R. Ohmura
{"title":"Calorimetric Measurements on Ionic Semiclathrate Hydrate Formed with Tetrabutylammonium Sulfate (TBASO4)","authors":"Ryo Koyama, R. Ohmura","doi":"10.17706/ijmse.2019.7.4.102-108","DOIUrl":"https://doi.org/10.17706/ijmse.2019.7.4.102-108","url":null,"abstract":"This paper reports the dissociation heats of ionic semiclathrate hydrate formed with tetrabutylammonium sulfate (TBASO4) holding the bivalent anion. The heat flow rates and the dissociation heats of TBASO4 hydrate were measured by the differential scanning calorimetry (DSC) at the mass fractions 0.30, 0.34 and 0.38. On the DSC curves of the heat flow rate, the two peaks were observed at the mass fractions 0.30 and 0.34, and the single peak was observed at the mass fraction 0.38. The largest dissociation heat of TBASO4 hydrate was 190 kJ·kg-1 at the mass fraction 0.34.","PeriodicalId":14103,"journal":{"name":"International Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87881622","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: 1
Crystal Growth Observation of Tetrabutylphosphonium Acetate (TBPAce) Hydrate Suitable as Thermal Energy Storage Medium 适合作热能储存介质的四丁基醋酸磷(TBPAce)水合物晶体生长观察
International Journal of Materials Science and Engineering Pub Date : 2019-12-01 DOI: 10.17706/ijmse.2018.6.4.126-132
Y. Arai, R. Ohmura
{"title":"Crystal Growth Observation of Tetrabutylphosphonium Acetate (TBPAce) Hydrate Suitable as Thermal Energy Storage Medium","authors":"Y. Arai, R. Ohmura","doi":"10.17706/ijmse.2018.6.4.126-132","DOIUrl":"https://doi.org/10.17706/ijmse.2018.6.4.126-132","url":null,"abstract":"Formation and growth of tetrabutylphosphonium acetate (TBPAce) hydrate was observed. This study was performed at the mass fraction 0.35 and 0.42. The crystal growth was observed respectively at the subcooling temperature 3 K and 7 K. When the subcooling temperature was 3 K, the skeletal crystals were observed at both mass fractions. When the subcooling temperature was 7 K, the dendrite crystals were observed at both mass fractions.","PeriodicalId":14103,"journal":{"name":"International Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85212854","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: 0
Zero Bias Electron Transport Properties of Molecular Junctions Formed from Smallest Fullerenes C20 and C24 最小富勒烯C20和C24形成的分子结的零偏置电子输运性质
International Journal of Materials Science and Engineering Pub Date : 2019-12-01 DOI: 10.17706/ijmse.2019.7.4.89-95
R. Kaur, C. Stampfl
{"title":"Zero Bias Electron Transport Properties of Molecular Junctions Formed from Smallest Fullerenes C20 and C24","authors":"R. Kaur, C. Stampfl","doi":"10.17706/ijmse.2019.7.4.89-95","DOIUrl":"https://doi.org/10.17706/ijmse.2019.7.4.89-95","url":null,"abstract":"Using density functional theory and the non-equilibrium Greens function formalism, we compare the zero bias electronic properties of two molecular junctions formed from the smallest fullerenes: C20 and C24. The results show that both junctions exhibit superconducting properties of the order of 2.5G0 and 3.12G0, respectively. The C24 junction exhibits a smaller HOMO-LUMO gap and higher zero bias conductance. The electronic wave functions are examined to understand the origin of the transmission peaks and resulting conductance. We find that for the C24 junction, the electrodes donate charge to the molecule giving rise to an occupied and unoccupied state very close to the Fermi level, resulting in a high and broad transmission peak that is responsible for the high conductance. For the C20 junction, the molecule loses some electron density and transmission is via unoccupied orbitals close to the Fermi level.","PeriodicalId":14103,"journal":{"name":"International Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79378479","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: 0
Effect of T6 Heat Treatment on Mechanical Properties and Microstructures of Cast Al-Si-Sn-Fe-Cu T6热处理对Al-Si-Sn-Fe-Cu铸件力学性能和组织的影响
International Journal of Materials Science and Engineering Pub Date : 2019-12-01 DOI: 10.17706/ijmse.2019.7.4.109-124
F. Adnan, H. Rudianto, Hery Sulistyo, Deny Haryadi
{"title":"Effect of T6 Heat Treatment on Mechanical Properties and Microstructures of Cast Al-Si-Sn-Fe-Cu","authors":"F. Adnan, H. Rudianto, Hery Sulistyo, Deny Haryadi","doi":"10.17706/ijmse.2019.7.4.109-124","DOIUrl":"https://doi.org/10.17706/ijmse.2019.7.4.109-124","url":null,"abstract":"Al-Si alloy is a famous casting material which has excellent characteristics to apply, such as good casting ability, excellent welding ability, and corrosion resistance. This study discusses the percentage of the chemical composition of Al-Si with the addition of Sn. the solubility of Sn is a study to study these effects that affect the mechanical properties of Al-Si players. The results show that with a higher Sn concentration, the mechanical properties of the mixture of Al-Si and Sn will increase and can increase precipitation. the evaluation aims to identify the distribution of chemical composition in materials using SEM-EDS and XRD. in this study a mixture of Al-Si and Sn after casting and the T6 heat treatment process formed precipitation of Mg2Si and Fe3Si, which could enable increased mechanical properties.","PeriodicalId":14103,"journal":{"name":"International Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88577957","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: 0
Assessment of EPP Material Form Helmet Liner EPP材料形式头盔衬垫的评估
International Journal of Materials Science and Engineering Pub Date : 2019-09-01 DOI: 10.17706/ijmse.2019.7.3.59-66
T. Teng, C. Liang, Jun-Xiang Lee
{"title":"Assessment of EPP Material Form Helmet Liner","authors":"T. Teng, C. Liang, Jun-Xiang Lee","doi":"10.17706/ijmse.2019.7.3.59-66","DOIUrl":"https://doi.org/10.17706/ijmse.2019.7.3.59-66","url":null,"abstract":": Studies have shown that bicyclers wearing helmets exhibit a significantly lower rate of sustaining head trauma than those not wearing helmets do, confirming the protection effectiveness of helmets. The shapes and material characteristics of liner play a crucial role in buffer performance. Many foam materials exist for liner. Selecting liner materials that are high in impact absorption capacity, light in weight, and environmentally friendly is essential to designing bicycle helmets. Studies have shown that bicyclers wearing helmets exhibit a significantly lower rate of sustaining head trauma than those not wearing helmets do, confirming the protection effectiveness of helmets. This study established and analyzed impact test models in LS-DYNA according to the helmet standards of EN 1078: 2006, CPSC: 16 CFR Part 1203, and SNELL B95. Currently, most bicycle helmets in the market feature expanded polystyrene (EPS) liner. To enhance the impact absorption performance of helmets, this study adopted a new liner materials-expanded polypropylene (EPP). The impact absorption performance of the helmet models employed in this study was analyzed and compared to evaluate the applicability of the new liner materials in bicycle helmets.","PeriodicalId":14103,"journal":{"name":"International Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84720879","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: 0
A Study on the Shape Control of Multiple Layers for PES Nanofiber Using Electrospinning Method of Top-down Spinning 静电纺丝法对PES纳米纤维多层形状控制的研究
International Journal of Materials Science and Engineering Pub Date : 2019-09-01 DOI: 10.17706/ijmse.2019.7.3.81-88
Nam-su Kwak, C. Choi, Jeong-Gi Lee
{"title":"A Study on the Shape Control of Multiple Layers for PES Nanofiber Using Electrospinning Method of Top-down Spinning","authors":"Nam-su Kwak, C. Choi, Jeong-Gi Lee","doi":"10.17706/ijmse.2019.7.3.81-88","DOIUrl":"https://doi.org/10.17706/ijmse.2019.7.3.81-88","url":null,"abstract":"In this study, we investigated the diameter and pore control of PES nanofibers by focusing on the process parameters such as concentration of polymer solution, applied voltage of spin column, and injection rate of polymer solution among various electrospinning parameters. The device for electrospinning was designed by modularizing to be able to cope with changes in test conditions and large area. The detailed device consists of a fabric feeding part, a spinning part, a soaking part, a drying part, and a fabric transfer part, the spinning device is based on top-down spinning and the spinning column is composed of 12 columns with 10 nozzles per column. The results obtained from this study are as follows. The maximum pore diameter is less than 22 kV at an applied voltage of 20 kV, the standard deviation of nanofiber diameter at each applied voltage means that the fibers radiated at 20 kV from 18 kV to 245.84 nm, 20 kV at 183.52, and 22 kV at 232 kV were more uniformly emitted, it has been proved that the nanofibers are radiated unevenly due to the effect of the strong applied voltage at 22 kV.","PeriodicalId":14103,"journal":{"name":"International Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75179317","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: 0
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