摘要：This study proposed a prediction formula for the torsional strength enabling to reflect the tensile strength of ultra high performance concrete (UHPC) beams based upon the thin-walled tube theory. The remarkable ductile behavior of UHPC can also be attributed to the steel fiber reinforcement. This feature must be considered to provide rational explanation of the torsional behavior of UHPC structures. In this study, the proposed torsional design adopts a modified thin-walled tube theory so as to consider the tensile behavior of UHPC. And torsion test was conducted on thin-walled UHPC box beams to validate the proposed formula through comparison of the predicted torsional strength with the experimental results. The comparison of the predicted values of the cracking torque and torsional moment resistance with those observed in the torsional test of UHPC verified the validity of the design method. The contribution of the steel fibers to the torsional strength and cracking load was larger than that of the stirrups, but the stirrups appeared to contribute additionally to the torsional ductility. Accordingly, it is recommended that design should exploit effectively the contribution of the steel fiber rather than arrange a larger number of stirrups in UHPC structures subjected to torsion.

摘要：According to federal communication commission (FCC) rules, the 3.1 - 10.6 GHz band is allocated to the amateur ultra wideband (UWB) applications. On the other hand, the 5.15 - 5.825 GHz band is associated with the wireless LAN (WLAN) applications according to IEEE 802.11 and HIPERLAN/2 standards. Therefore, an unwanted intrusion will be expected between these two frequency requests. In This paper a comprehensive review will be done over a wide range of UWB microstrip antennas which all have the band notching property over the WLAN band to effectively avoid this interference. All the band notching techniques in the recent papers will be categorized in 4 distinct methods including the tuning stub, the shaped slot, the parasitic element, and the fractal geometry. A few typical papers will be introduced and evaluated in each category for declaration purposes. At last, a comparison will be done between these methods and the relative papers.

摘要：This paper presents the design of a small printed ultra wideband antenna with Band Notched characteristics. Both the free space and on-body performances of this antenna were investigated through simulation. The newly designed UWB antenna is more revised small form factor sized, with the ability to avoid interference caused by WLAN (5.15 - 5.825 GHz) and WiMAX (5.25 - 5.85 GHz) systems with a band notch. The return loss response, gain, radiation pattern on free space of the antenna were investigated. After that, the on-body performances were tested on 3-layer human body model with radiation pattern, gain, return loss, and efficiency at 3.5, 5.7, 8, 10 GHz and all the results were compared with free space results. As the on-body performance was very good, the proposed antenna will be suitable to be used for multi-purpose medical applications and sports performance monitoring.

摘要：自SD卡诞生的那天起．储存卡与读卡器就如同一对双胞胎形影不离．虽然也可以通过数码相机、掌上电脑等设备将其中的数据读出．但其不便也是显而易见的。SanDisk(最新推出的这款特殊设计的SD卡．上面同时设计有SD卡与USB 2.0两种连接方式，平时可当作普通的SD卡使用．当需要以USB方式连接时．只要将记忆卡后段往前折．让位于记忆卡中间部分的USB插口露出．即可插入USB插槽中．充当USB随身碟使用．在易用性上可谓迈出了革命性的一步。

摘要：5200魔幻版显卡在公板的基础上进行了加强设计，为了能够在高频率下稳定地工作，讯景的工程师们重新设计了电路布局．采用宝蓝色PCB大板。为了提升显卡的超频能力．板上使用了大量高品质三洋贴片铝电容，电路走线设计也很合理。电源供电部分，由两个供电模块分别为显存和显示核心单独供电，为显卡超频提供更为稳定的电流。

摘要：CoolerMaster ultra Vortex的型号为KCC-V91，外观设计风格独特．整体采用星型放射状散热片设计．散热片部分采用全铜材质．散热鳍片在冲压成末端微弯的特定形状之后．通过末端弯折锁合．最后将散热鳍片通过回流焊接技术焊接在中心负责吸热的铜柱上．形成放射状的太阳花构造。这种设计的好处就在于对气流的干扰和限制很少，空气从各个角度沿散热鳍片的伸展方向流出，产生的风噪很小，非常适合静音型散热器。

摘要：金钟ultra 6403Q套装堪称百变全能,三段式的开脚设计,脚架中轴部分还可单独拆卸做独脚架,可高可低,无论何时何地的拍摄都可以胜任。中轴可拆卸成独脚架金钟ultra 6403Q套装由ultra 6400脚架和QHD-S6Q云台两部分组成,脚架部分采用金钟独创的直接紧凑型脚管专利技术,只要数秒就可以完成将脚架全部展现出来。最有特色的是。