苯乙酮-d_8镍-铝合金液相还原合成苯乙醇-d_(10)

以氘代苯 ｄ６Ｃ６Ｄ６及氘代醋酸 ｄ４ＣＤ３ＣＯＯＤ等为原料制得氘代苯乙酮 ｄ８Ｃ６Ｄ５—ＣＯＣＤ３，在２０～５０℃下，于１０％～２０％（ｗ）ＮａＯＤ重水溶液中用镍－铝（Ｎｉ－Ａｌ）合金还原，制得了产率８５．２％、氘代率９９．２％的氘代α 苯乙醇 ｄ１０Ｃ６Ｄ５—ＣＤＯＤＣＤ３。本文介绍了氘代苯乙酮 ｄ８的Ｎｉ－Ａｌ合金液相还原反应工艺，并对温度、助溶剂氘代甲醇 ｄ４ＣＤ３ＯＤ的用量、ＮａＯＤ的质量分数等影响产物产率的主要因素进行了较为详尽的探讨     

粉体的液力输送

对粉体液力输送中输送压降与输送速度的设计计算方法进行了综述 ,包括可沉降的悬浮液输送和非沉降的浆液输送两方面。可沉降的悬浮液输送包括了均化悬浮、非均化悬浮、滑动沉积层和固定沉积层等 4类 ;非沉降的浆液输送包括了纯粘性浆液、粘弹性浆液及依时性浆液等 3类。     

浅析设计、材料和制造技术对提高金属针布质量的影响

从针布齿条的设计、材料和制造技术三方面入手，通过与国际先进技术水平产品对比找出差距，结合丰富的生产实践经验，分析了提高国产金属针布质量的途径。     

Symmetrical design in piezoresistive sensing for micromechanical resonator

A central symmetrical design in double ended tuning fork (DETF) resonator is demonstrated to remove the high feedthrough signal. The equivalent electrical simulation model for piezoresistive sensing is first built to illustrate that the location arrangement of connection pads plays a decisive role in the response of the high frequency resonators. Both of the symmetrical design and asymmetrical design of the DETF that resonating at 3.1 MHz are fabricated and tested to verifiy that with the same dimension of the resonator structrue, the symmetrical design can help to cancel the feedthrough signal from the output of the wheastone bridge.     

A CFAR detector for MIMO array radar based on adaptive pulse compression-Capon filter

Under the condition of strong clutter and finite training samples,a novel CFAR detector based on the proposed adaptive pulse compression-Capon filter (APC-Capon filter) is presented for MIMO array radar which transmits intrapulse coded waveforms.Both theoretical analysis and numerical simulations show that the proposed APC-Capon filter can utilize the non-reiterative adaptive pulse compression technique to alleviate both range sidelobes and mutual interference;at the same time it also can borrows ideas from the coherent signals cancellation of adaptive beamforming to perform clutter suppression.The detection performance simulations show that,with the same size parameters (including code length and the numbers of transmitter elements,receiver elements as well as pulses),the proposed CFAR detector is inferior to the adaptive matched filter (AMF) detector.But as the size parameters increase,the proposed CFAR detector will gradually outperform the AMF detector with smaller size parameters,and more importantly,unlike the AMF detector which has a lot of difficulties in performing due to the inordinate demands for the computational complexity and training sample size,this demands of the proposed CFAR detector will not significantly increase.The simulations also show that,the correlation properties of these intrapulse coded waveforms have certain effect on the APC-Capon filter and its corresponding CFAR detector.But fortunately,the effect will decrease as the number of intrapulse coded waveforms increases.     

贵阳高校冬季供暖必要性与热源形式

对贵阳高校冬季供暖的必要性和可行性进行探讨,分析了可采用的热源形式.     

发动机启动不连续问题分析及解决措施

某车型搭载的1.8L自然吸气式发动机在市场上出现启动不连续的问题.为解决此问题,本文详细分析了与发动机启动相关的因素,在理论分析的基础上,通过试验对比的手段进行了逐一验证.结果表明,造成发动机启动不连续的原因为发动机驱动盘尺寸错误,导致转速传感器信号错误,引起ECU点火时刻错误,最终导致发动机启动不连续.针对该故障原因,提出了优化驱动盘尺寸的方案.经试验验证,该方案能有效解决发动机启动不连续的问题.     

汽油罐不锈钢浮盘盖板和浮筒的腐蚀

对某石化公司642号废汽油储罐0Cr18Ni9不锈钢浮盘盖板和浮筒腐蚀情况进行了物理测试,分析了腐蚀的原因。结果表明,不锈钢浮盘盖板和浮筒是由于废汽油中有硫化物而导致局部腐蚀穿孔。腐蚀穿孔是由浮盘盖板下表面萌生,并向接触其相部位的上表面发展。同时,由于海水冲洗和稀释引起氯化物对不锈钢浮盘盖板和浮筒的局部腐蚀。在分析的基础上提出了切实可行的防护措施。     

成型压力对合成CaZrO3材料性能的影响

以电熔ZrO2粉和活性石灰粉为原料,研究了不同成型压力对合成CaZrO3的影响,并利用XRD和SEM对材料的矿物相和微观结构进行了分析。实验结果表明:随着成型压力的增加,试样的致密程度加大;当成型压力达到200MPa后,成型压力对合成锆酸钙材料的致密度影响减弱。成型压力对合成锆酸钙材料的矿物相无影响,对材料的显微结构影响甚微。综合分析,适宜的成型压力为200MPa。