The Open Materials Science Journal最新文献_第3页

Advanced Microelectronic and Nanoscale Semiconductor Materials & Applications 先进微电子和纳米半导体材料及应用

The Open Materials Science Journal Pub Date : 2016-07-15 DOI: 10.2174/1874088X01610010018

Shen-Li Chen

引用次数: 0

Failure Analysis of Cracking on Side Tooth Gingivae of a Percussive Drill Bit 冲击钻头侧齿龈开裂失效分析

The Open Materials Science Journal Pub Date : 2016-06-30 DOI: 10.2174/1874088X01610010008

Zhao Tianliang, L. Zhiyong, Du Cuiwei, Dong Chaofang, L. Xiaogang

{"title":"Failure Analysis of Cracking on Side Tooth Gingivae of a Percussive Drill Bit","authors":"Zhao Tianliang, L. Zhiyong, Du Cuiwei, Dong Chaofang, L. Xiaogang","doi":"10.2174/1874088X01610010008","DOIUrl":"https://doi.org/10.2174/1874088X01610010008","url":null,"abstract":"Failures of percussive drill bits have been attributed to the external mechanical force and structural design by engineers and researchers for a long time. Few attentions have been focused on the material itself. Generally, it is the unqualified material, induced by the improper metallurgy and heat treatment process, which makes the drill bits fail soon after they are put into service. Reasons of the crackings on side tooth gingivae of a drill bit, which failed prematurely at the beginning of the service, were analyzed comparatively. Scanning electron microscope, metallographic observation, mechanical performance test and chemical composition analysis were adoptedfor the failure analysis. Results show that microstructure, chemical composition and mechanic properties of the substrate were excluded from the reasons of the cracking. It is mainly the excessive inclusions and defects in the carburized layer which induced the inhomogeneity of material organization and performance. Those inclusions and defects act as stress concentrators and leading to the crack initiation. In addition, toughness of the carburized layer is also decreased due to its over-carburization. It makescracks more easily initiate from the carburized layer and then propagate into the substrate under the stress of interference fit.","PeriodicalId":22791,"journal":{"name":"The Open Materials Science Journal","volume":"26 1","pages":"8-17"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82526577","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

Characteristics of GaAs Power MESFETs with Double Silicon Ion Implantations for Wireless Communication Applications 无线通信用双硅离子注入GaAs功率mesfet的特性

The Open Materials Science Journal Pub Date : 2016-06-15 DOI: 10.2174/1874088X01610010029

C. Zheng, W. Chiang, Y. Lai, E. Chang, Shen-Li Chen, K. B. Wang

{"title":"Characteristics of GaAs Power MESFETs with Double Silicon Ion Implantations for Wireless Communication Applications","authors":"C. Zheng, W. Chiang, Y. Lai, E. Chang, Shen-Li Chen, K. B. Wang","doi":"10.2174/1874088X01610010029","DOIUrl":"https://doi.org/10.2174/1874088X01610010029","url":null,"abstract":"GaAs power metal-semiconductor field-effect transistors (MESFETs) were fabricated using direct double silicon (Si) ion implantation technology for wireless communication applications. A 150-μm MESFET had a saturation drain current of 238 mA/mm after Si3N4 passivation. A 15-mm MESFET, when measured under a class-AB condition with a biased drain voltage of 3.4 V and a quiescent drain current of 600 mA, delivered a maximum output power (Pout) of 31.1 dBm and a maximum power-added efficiency (PAE) of 58.0% at a frequency of 1.88 GHz. The MESFET exhibited a Pout of 29.2 dBm with a PAE of 45.0% at the 1-dB gain compression point. The MESFET, when measured under a deep class-B condition with a biased drain voltage of 4.7 V and a quiescent drain current of 50 mA, achieved a maximum Pout of 33.1 dBm and a maximum PAE of 55.9% at 1.88 GHz. The MESFET operating at 4.7 V and 1.88 GHz exhibited a P1dB of 31.8 dBm and an associated PAE of 47.1% at the 1-dB gain compression point. When tested by IS-95 code-division multiple access (CDMA) standard signals and biased at 4.7 V under the deep class-B condition, the MESFET with a Pout of 28 dBm demonstrated an adjacent channel power rejection (ACPR) of –31.2 dBc at +1.25 MHz apart from the 1.88 GHz center frequency and –45.7 dBc at +2.25 MHz.","PeriodicalId":22791,"journal":{"name":"The Open Materials Science Journal","volume":"16 1","pages":"29-36"},"PeriodicalIF":0.0,"publicationDate":"2016-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82926196","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

Study on Thermal Performance of Composites Prepared Using Poly(L-Lactic Acid) and Melamine 聚l -乳酸与三聚氰胺复合材料的热性能研究

The Open Materials Science Journal Pub Date : 2016-04-30 DOI: 10.2174/1874088X01610010002

Yan-Hua Cai, Lisha Zhao

引用次数: 0

Retraction Notice: Principle Analysis and Parameter Optimization for Uuderactuated End- Effector Manipulator for Apple Picking 摘苹果欠驱动末端机械手的原理分析及参数优化

The Open Materials Science Journal Pub Date : 2016-04-15 DOI: 10.2174/1874088X01610010001

Yu Ya-xin, Wu Fei, Zhu Rong, Zhang Fei

引用次数: 0

Demonstration of Evaporation Inhibition with Floating Polystyrene Board and its Motion Response 浮动聚苯板的蒸发抑制性能及其运动响应

The Open Materials Science Journal Pub Date : 2015-11-10 DOI: 10.2174/1874088X01509010220

Haibo Jiang, Yan Tian

{"title":"Demonstration of Evaporation Inhibition with Floating Polystyrene Board and its Motion Response","authors":"Haibo Jiang, Yan Tian","doi":"10.2174/1874088X01509010220","DOIUrl":"https://doi.org/10.2174/1874088X01509010220","url":null,"abstract":"Plain reservoirs in arid areas usually have a shallow water depth, a large surface area, and severe evaporative water-loss. To lessen the water loss, a polystyrene board coverage technique was used. This paper represents a demonstrative application study of the polystyrene board coverage technique in the Daquangou Plain Reservoir in the city of Shihezi, Xinjiang. Six different polystyrene board structures were created and tested to measure the wind wave resistance level, damage type, and reason for the damage. To study the motion of the floating polystyrene board in waves, this paper applied the kinematic theory for rigid bodies and utilized the Newton's Second Law to develop the coupling kinematic equation for the polystyrene board. We also use a modified sectioning method to calculate the added mass of the floating polystyrene board, fluid damping, and static water restoring force. The heave and pitch motion response of the floating polystyrene board was analyzed and determined to be periodic. The connection and fix strategy for the polystyrene board structures could resist the effect of level-6 wind waves, which served the purpose of inhibiting the evaporation in the plain reservoir. Keyword: Floating polystyrene board, plain reservoir, polystyrene board coverage technique, motion response, wave load.","PeriodicalId":22791,"journal":{"name":"The Open Materials Science Journal","volume":"90 1","pages":"220-224"},"PeriodicalIF":0.0,"publicationDate":"2015-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81519943","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

Acoustic Emission Wavelet Analysis of Filament Wound Composite Tube Fatigue Damage Process 缠绕复合材料管疲劳损伤过程的声发射小波分析

The Open Materials Science Journal Pub Date : 2015-11-10 DOI: 10.2174/1874088X01509010214

Su-Juan Hua, Changhao Cheng

引用次数: 2

Synthesis, Structural Characterization and Electrochemical Property of aDinuclear Cu (II) Complex Material 核Cu (II)配合物的合成、结构表征及电化学性能

The Open Materials Science Journal Pub Date : 2015-11-06 DOI: 10.2174/1874088X01509010210

X. Tai, Xin Wang, L. Liu

引用次数: 0

Design of Special Plastic Bearings and Their Application in Renewable Energy Conversion System 特种塑料轴承的设计及其在可再生能源转换系统中的应用

The Open Materials Science Journal Pub Date : 2015-11-04 DOI: 10.2174/1874088X01509010203

Yongjun Dong, Wanqiang Zhu, Xueming Zhang, Jingfu Guo

{"title":"Design of Special Plastic Bearings and Their Application in Renewable Energy Conversion System","authors":"Yongjun Dong, Wanqiang Zhu, Xueming Zhang, Jingfu Guo","doi":"10.2174/1874088X01509010203","DOIUrl":"https://doi.org/10.2174/1874088X01509010203","url":null,"abstract":"To improve the operational reliability of renewable energy conversion system, high-performance polymers and engineering plastics are used to make some parts and components of the energy conversion device, especially in the marine renewable energy generation field. In this article, special plastic bearings based on the material of polyoxymethylene (POM) were designed and applied in the power generation device of both tidal current energy and island wind energy. The properties of POM were analyzed, and the load of a POM ball was tested. Special structures of the plastic bearings were designed to meet the requirements of pressure resistance and to reduce the friction. These plastic bearings had been used in the prototypes of 20 kW tidal current turbine generation device and 15 kW island wind turbine generation device. According to the prototypes' operation, the results indicate that these plastic bearings work well and are very suitable for the application in renewable energy conversion system. By optimizing the structure, such plastic bearings would be generalized and applied in the renewable energy generation device with a higher power level.","PeriodicalId":22791,"journal":{"name":"The Open Materials Science Journal","volume":"49 1","pages":"203-209"},"PeriodicalIF":0.0,"publicationDate":"2015-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90542599","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

The Nonlinear Dynamic Behavior Analysis and Research for Sheet Steel Stamping Forming Problems Based on Finite Element Method 基于有限元法的薄板冲压成形问题非线性动力行为分析与研究

The Open Materials Science Journal Pub Date : 2015-11-04 DOI: 10.2174/1874088X01509010198

Li Zhang, Zhang Tao, Kai-Teng Wu

引用次数: 0