Design of 60GHz RF Transceiver in CMOS： Challenges tnd Recent Advances

With more scaling, the speed of than 40 years Moore CMOS transistors is around 100 GHz. Such fact makes it possible to realize mm-wave circuits in CMOS. However, with the target of achieving broadband and power-efficient operation, 60 GHz CMOS RF transceiver faces severe challenges. After reviewing the technology issues, regarding the 60 GHz applications, this paper discusses design challenges both from the system and the building block levels, and also presents some simulated or measured circuits results.     

Preparation and characterization of polymethyltrifluoropropylsilicone modified acrylonitrile–butadiene rubber/fluorosilicon rubber blend

The blending of polymethyltrifluoropropylsilicone‐modified acrylonitrile–butadiene rubber (MNBR) and fluorosilicon rubber (FSR) at 70 : 30 ratio was investigated. The grafting of mercapto‐functionalized polymethyltrifluoropropylsilicone onto acrylonitrile‐butadiene rubber (NBR) by thiol‐ene reaction was carried out with 2,2′‐azobisisobutyronitrile as initiator in a Haake torque rheometer. The rheological properties of NBR grafting obtained at varying dosages of polymethyltrifluoropropylsilicone in a Haake torque rheometer were studied using torque curves. Grafting reaction was confirmed by ¹H nuclear magnetic resonance and energy‐dispersive X‐ray spectroscopy. Results of scanning electron microscopy and dynamic mechanical analysis showed better compatibility of MNBR/FSR blend than NBR/FSR reference blend. Meanwhile, the macro‐mechanical properties of the blend significantly improved. The tensile strength and tear strength of MNBR/FSR blend were improved to 14.34 MPa and 44.94 KN/m, respectively, which were 2.92 MPa and 13.03 KN/m higher than those of NBR/FSR reference blend. The low‐temperature brittleness of the blend was improved to ?57°C, an increase of ?6°C compared with that of NBR. These results indicated that MNBR/FSR blend at 70 : 30 ratio had improved compatibility because of the grafting chains that acted as interfacial agents. The low‐temperature resistance of the blend was also enhanced. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42328.     

含磷高强IF钢的析出物与深冲性能

通过实验室冶炼含磷高强IF钢,并经锻造、热轧、卷取、冷轧和连续退火,利用扫描电镜和XRD等设备观察其内部的二相粒子和织构特征,研究了轧制工艺参数和退火工艺对含磷高强IF钢最终深冲性能的影响。结果表明,奥氏体区终轧条件下,降低终轧温度和和提高卷曲温度能够提高r值。在本次试验条件下,终轧温度930℃、卷取温度740℃,试验钢能够获得较好的成形性能,经冷轧并连续退火后,能够达到含磷高强IF钢的目标要求。     

放射性伽玛测井在柴达木东北缘查查香卡地区稀有金属和稀土元素研究中的应用

随着中国经济的快速发展,对矿产资源的需求量日益增加,特别是稀土元素中的稀有金属是具有战略意义的金属元素。稀有金属广泛地应用于航天、航空、电子、核电等高科技领域。本次勘查主要是对查查香卡地区324铀矿点落实控制,并提交资源量。勘查中发现铀矿床岩石中放射性元素铀(U),钍(Th),钾(K)和密切相关,实验室样品分析结果也显示查查香卡铀矿床中的稀土矿与铀矿的关系密切。根据铀矿勘查结果,铀矿含量达到硬岩铀矿工业品位,同时预测查查香卡地区铀矿伴生稀土原生矿石达到边界品位,并通过FORECAST函数推算出稀土元素(∑REE)的含量。     

2,4-二氯苯氧基乙酸从腐植酸、金属氧化物、腐植酸金属络合物上解吸附作用的动力学研究

农药残留已经成为环境污染的一大重要来源。通过2,4-D从金属氧化物,腐植酸金属络合物以及腐植酸表面上解吸附的动力学分析与对比,考察腐植酸在农药中的作用。     

提高路由器性能的排队方法

文简单介绍了路由器的体系结构,以及数据交换的路径和方法。并且以ＣＩＳＣＯ公司路由器为例,介绍端口采用的排队模型。针对于阻塞状态,提出了一种可以提高性能的排队模型。     

提高HDPE阻隔性能的方法

提高高密度聚乙烯(HDPE)对气体、水蒸气及一些化学溶剂阻隔性能的主要方法是将其与高阻隔材料或无机纳米粒子共混,通过控制加工工艺改变HDPE分子取向或加入成核剂改善结晶形态与分布,对HDPE制品表面化学处理等.其中,与高阻隔材料共混比较常见,可将对油渗透率降低98％之多,在汽车油箱上有很重要的应用.其他方法可以提高对氧...