高功率微波对弹载GPS天线的耦合特性分析

建立了高功率微波对弹载GPS天线的耦合模型,仿真分析了高功率微波的脉宽、极化形式及波束与目标的交汇角等因素对耦合特性的影响。研究表明：在采用高功率微波武器攻击GPS制导武器时,为了增大对目标的毁伤概率,可以采用脉宽窄与目标天线极化相匹配的微波源,同时尽量减小攻击波束与弹轴正向的夹角。该研究为高功率微波武器对抗GPS制导武器提供了一定的技术支撑。     

高功率微波导弹武器发展情况分析

介绍了高功率微波、高功率微波武器的概念,以及高功率微波武器的毁伤机理和技术特点,分析了高功率微波技术的发展脉络,对高功率微波武器项目和型号的发展情况进行了梳理。重点介绍了美国CHAMP高功率微波导弹的项目情况,分析了其技术特点,对其可能的适用攻击目标和战争阶段情况进行了探讨。     

W波段VLASOV准光模式变换器的优化仿真

针对传统天线受到高功率微波的输出功率和脉宽限制的问题,对W波段准光模式变换器进行优化仿真。基于准光近似理论,建立了输入模式为TE03模、频率为94 GHz的阶梯型VLASOV准光模式变换器模型,并进行了仿真优化设计,得到了优化后的VLASOV准光模式变换器数模型参数。仿真结果表明：辐射波束具有明显的方向性,波束明显变窄锐化,主瓣增益很高,达到29.46 dBi,能量主要集中在主瓣上,旁瓣增益较低,辐射效率达到87.36%。     

微波消解ICP-AES法测定高碳铬铁中铬锰磷

用微波消解法,配合电感耦合等离子体原子发射光谱技术,选择适宜的工作条件,建立定量测定高碳铬铁中铬、锰、磷的方法。结果表明,此法快速、准确,回收率在90.9%~101.2%之间,相对标准偏差不大于2.84%。     

Fe73.5Cu1Nb3Si13.5B9纳米晶软磁粉体的制备工艺与微波电磁性能

研究热处理工艺、材料粒度对Fe73.5Cu1Nb3Si13.5B9材料微波电磁性能的影响,对该类材料的微波电磁性能和吸波性能进行测试。结果表明:热处理工艺对材料的微波电磁性能产生较大的影响,达到晶化条件的热处理工艺有利于提高材料的电磁性能;随着材料粒度的减小,微波电磁性能提高,电磁参数之间的匹配性提高;Ⅴ级粒度材料的最低反射率达到-12 dB,低于-5 dB的频宽达12.5 GHz。     

Microwave irradiated and thermally heated olive stone activated carbon for nickel adsorption from synthetic wastewater: A comparative study

In attempt to compare the removal efficiency and yield of the activated carbon prepared using the conventional and microwave‐assisted heating is the focus of this work. Toward this olive stone (a biomass precursor) is activated using the popular activating agent potassium hydroxide. The process optimization exercise is carried out by using the standard full factorial statistical design of experiments (response surface methodology). The activated carbons prepared under the optimized conditions are compared based on the adsorption capacity and yield. The adsorption capacity was found higher using microwave heating as compared with conventional heating. The microwave heating requires significantly lesser holding time as compared to conventional heating method to produce activated carbon of comparable quality, with higher yield. The BET surface area of carbon using microwave heating is significantly higher than the conventional heating. Although the mesopore surface area of carbon is not vary significantly, the activation time, power, and nitrogen gas consumption are significantly lower than the conventional heating rendering that the activation process via microwave is more economical than that via conventional heating. The adsorption isotherm data fitted the Langmuir isotherm well and the monolayer adsorption capacity was found to be 12.0 and 8.42 mg/g for microwave and thermally heated activated carbon, respectively. Regeneration studies showed that microwave‐irradiated and thermally heated olive stone could be used several times by desorption with an HCl reagent. Both carbons can be used for the efficient removal of Ni²⁺ (>99%) from contaminated wastewater. © 2013 American Institute of Chemical Engineers AIChE J, 60: 237–250, 2014     

微波-过氧化氢协同降黏辅助酶法制备壳寡糖

利用微波-过氧化氢协同处理壳聚糖,通过降低壳聚糖的黏度辅助促进其酶解制备壳寡糖。通过单因素实验与正交实验,确定了影响壳聚糖微波-过氧化氢降黏效果的因素主次顺序是微波时间、H2O2的用量、微波功率。优化后的降黏条件是:H2O2添加量为0.1 mL,微波功率为120 W,微波时间为0.5 min,所得壳聚糖黏度比原料黏度降低了96.9%,且并未发生结构的改变。对其酶解的结果表明,经微波-过氧化氢协同降黏再酶解的壳寡糖得率为80.1%,比未经降黏处理的提高了11.8%,产物壳寡糖数均相对分子质量为2 027,平均聚合度为10,明显低于未经降黏处理而直接酶解所得的壳寡糖。     

益母草多糖微波提取及在卷烟中的应用

采用微波辅助法对益母草多糖的提取工艺进行考察,并对益母草多糖进行了卷烟加香试验。以干燥益母草原料粒度（目数）、料液比、微波功率、提取时间为考察因素,益母草多糖得率为指标,采用单因素和正交试验法对益母草多糖提取工艺进行优化。确定了微波辅助提取的最佳工艺参数为：粒度（目数）80目（粒径约0.178 mm）,料液比1∶50（g/mL）,微波功率700 W,提取时间16min。按此优化条件,益母草多糖得率可达到3.20%。加香应用结果表明,益母草多糖能赋予卷烟特殊香韵调,保润并柔和细腻烟气,提高烟气舒适性。     

微波处理对纤维素产糖能力的影响

采用纤维素为原料,以离子液体为溶剂,在微波辐射下进行纤维素的预处理。预处理完成后进行再生纤维素的酶解产糖,并采用DNS分光光度计法进行还原糖产率的测定,进而分析微波功率与时间对再生纤维素还原糖产率的影响。还原糖转化率最佳值(96.21%)出现在微波功率为230W处理5min时;稻杆产糖量随着微波时间的延长而呈现先上升后下降的趋势;在较强的功率539W条件下,延长作用时间则会引起还原糖转化率的上升,但继续延长时间,溶剂完全喷溅,难以继续进行处理。     

CdWO4 nanorods: Ultrafast synthesis via a PEG-1000 polymer-assisted enhanced microwave synthesis route and their photoluminescence property

Cadmium tungstate (CdWO₄) nanorods have been successfully ultrafast synthesized in several minutes under enhanced microwave irradiation conditions and characterized by XRD, SEM, TEM, and photoluminescence. The products show a very strong photoluminescence peak at 475 nm with the excitation wavelength of 350 nm and a short decay time.