Effects of Annealing Below Glass Transition Temperature on the Wettability and Corrosion Performance of Fe-based Amorphous Coatings

This study investigated the effect of annealing below glass transition temperature (T_g) on the microstructural characteristics, mechanical property, wettability, and electrochemical performance of activated combustion-high velocity air fuel (AC-HVAF)-sprayed Fe-Cr-Mo-W-C-B-Y amorphous coatings (ACs). Results showed that Fe-based ACs with a thickness of ~ 300 μm exhibited a fully amorphous structure with low oxidization. Originating from the reduced free volume, sub-T_g annealing increased the thermal stability, hardness, and surface hydrophobicity of Fe-based ACs. The enhanced corrosion resistance of sub-T_g annealed ACs in 3.5 wt% NaCl solution was attributed to the increased surface hydrophobicity and passivation capability. This finding elucidates the correlation between sub-T_g annealing and the properties of Fe-based ACs, which promotes ameliorating ACs with superior performance.     

7H-Dibenzo(c,g)carbazole-DNA Adducts in Target and Non-target Organs of Mice Exposed by Acute and Chronic Administration

Carcinogen-DNA adducts appear to be biomarkers of effective dose and/or early effect. The relationship between these biomarker levels in target and non-target organs under acute and chronic exposures is important. 7H-Dibenzo(c,g)carbazole(DBC) has been shown to induce tumors in experimental animals. The time courses of DBC-DNA adduct formation in skin, liver and lung following both single (i.p.) and repeated (topical) administration of DBC were investigated. In the acute study, DNA binding levels increased rapidly in the lung over 3–7 days at all doses and then decreased slowly over 21 days; levels in the liver were 10 times that in the lung with similar increases in levels over time. In the chronic study, levels increased with time over 15 weeks with the liver binding levels 8–10 times that seen in skin and lung. In both studies the major adduct in liver was adduct 6, and in the lung adduct 3, while in skin adducts 2 and 3 were the major adducts. These data indicate that the adduct pattern is target organ specific, irrespective of the route, dose of administration or exposure regimen.     

Influence of Grounding Resistance Connecting to Surge Arrester on Effectiveness of Lightning Protection Caused by Direct Hit for Power Distribution Lines

In Japan, the grounding resistance of surge arresters (Arrs) for the lightning protection of power distribution lines is generally maintained below 30 Ω. Therefore, electric power companies have been spending large amounts of money on the construction and maintenance of low grounding resistances. In this paper, the influence of grounding resistance on lightning protection measures for power distribution lines with both a ground wire (GW) and Arrs is investigated by EMTP analysis and experiments. These results showed that even if the grounding resistance of Arrs becomes high, the effectiveness of lightning protection is hardly decreased. The results also indicated that it is more important for constructing a rational lightning protection system to install a large number of lightning protection devices on power distribution lines than to lower the grounding resistance of Arrs. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 179(3): 10–22, 2012; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21280     

A 0.13μm CMOS △∑ fractional-N frequency synthesizer for WLAN transceivers

A fractional-N frequency synthesizer fabricated in a 0.13 μm CMOS technology is presented for the application of IEEE 802.11 b/g wireless local area network (WLAN) transceivers.A monolithic LC voltage controlled oscillator (VCO) is implemented with an on-chip symmetric inductor.The fractional-N frequency divider consists of a pulse swallow frequency divider and a 3rd-order multistage noise shaping (MASH) △ ∑ modulator with noise-shaped dithering techniques.Measurement results show that in all channels,phase noise of the synthesizer achieves -93 dBc/Hz and -118 dBc/Hz in band and out of band respectively with a phase-frequency detector (PFD) frequency of 20 MHz and a loop bandwidth of 100 kHz.The integrated RMS phase error is no more than 0.8°.The proposed synthesizer consumes 8.4 mW from a 1.2 V supply and occupies an area of 0.86 mm2.     

A low flicker noise direct conversion receiver for IEEE 802.11g wireless LAN using differential active inductor

In this paper, a low flicker-noise, 2.4 GHz direct onversion receiver (DCR) has been designed. A dynamic current injection (DCI) technique has been utilized in addition with a tuning inductor in the mixing stage. The tuning inductor has been replaced by a differential active inductor circuit, which gives the same inductance, with less chip size and high quality factor. The DCR has been designed in a TSMC 0.18 μm 1P6M CMOS process for wireless LAN 802.11g applications. The proposed DCR achieves 6.7 dB SSB-NF, 34 dB conversion gain, −13.5 dBm IIP3, and flicker noise (1/f) corner frequency of 30 kHz with 137.5 mW power consumption from 1.8 V supply voltage.     

Study of activation cross-sections of deuteron induced reactions on rhodium up to 40 MeV

In the frame of a systematic study of the activation cross-sections of deuteron induced nuclear reactions, excitation functions of the ¹⁰³Rh(d,x) ^100,101,103Pd, ^{100g,101m,101g,102m,102g}Rh and ^103gRu reactions were determined up to 40 MeV. Cross-sections were measured with the activation method using a stacked foil irradiation technique. Excitation functions of the contributing reactions were calculated using the ALICE-IPPE, EMPIRE-II and TALYS codes. From the measured cross-section data integral production yields were calculated and compared with experimental integral yield data reported in the literature. From the measured cross-sections and previous data, activation curves were deduced to support thin layer activation (TLA) on rhodium and Rh containing alloys.     

WLAN802.11n组网规划相关问题研究

802.11n标准的众多可选特性增加了其组网规划的复杂性.本文从802.11n关键技术人手,分析了影响802.11n组网规划中网络覆盖、容量、双流工作模式、信道捆绑等关键问题,并结合实际测试,给出了802.11n实际组网规划中应注意的问题和规划设计建议.     

多小区OFDMA系统基于改进PSA的资源分配算法

针对载波、功率资源分配问题,考虑本小区对其它小区的干扰情况,提出了一种应用于多小区正交频分多址复用(OFDMA)系统中的改进罚函数模拟退火(PSA)算法.该问题模型是在传输速率和性能一定的条件下,最小化传输功率.该算法是一种随机寻优算法,是一种能将局部搜索扩展为全局搜索的启发式算法.仿真结果表明,改进算法简化了问题模型...     

500g/L甲基硫菌灵SC防治水稻纹枯病田间药效试验

对500g/L甲基硫菌灵SC防治水稻纹枯病田间药效进行试验,结果表明500g/L甲基硫菌灵SC对水稻纹枯病有较好的防治效果。当500g/L甲基硫菌灵SC使用剂量100mL/667m2、125mL/667m2、150mL/667m2时,其对水稻纹枯病10d的防效分别为64.25%、74.45%、80.21%。