摘要：A type of millimeter-wave antenna array with flexible design is proposed for a variety of applications at 60 *** antenna array can be adjusted to be linearly or circularly polarized by simply changing the radiation part of the antenna *** gain,wideband,and high radiation efficiency characteristics can be achieved by adopting a low insertion loss feeding network and broadband antenna *** the linearly polarized antenna array,simulation results show that the impedance bandwidth of the 2×2 antenna subarray reaches 21.6%,while the maximum gain achieves 15.1 dBi and has a fluctuation of less than 0.4 dBi within the working *** results of the 8×8 linearly polarized antenna array show a bandwidth of 21.6%and a gain of(26.1±1)dBi with an antenna efficiency of more than 80%.For the 8×8 circularly polarized antenna array,simulation results show that an impedance bandwidth of 18.2%and an axial ratio(AR)bandwidth of 13.3%are *** and efficiency of up to 27.6 dBi and 80%are achieved,respectively.A prototype of antenna array is fabricated,and results are compared and analyzed.

摘要：基于CMC的E-mail交际具有反馈及时、传送多重信息和创设真实语言文化学习情境的功能。实验人员设计并实施了中国和加拿大两国小学生基于CMC的E-mail交际,教学实验进行了4周。实验表明实验组学生与对照组学生存在差异,基于CMC的E-mail交际增强了小学生跨文化交际的意识,一定程度上增长了跨文化交际知识,提高了英语文化学习的兴趣和信心,为信息技术环境下跨文化交际素养的培养提供了一种可行的模式和途径。

摘要：　　石家庄化纤公司己内酰胺装置是以甲苯为原料,经氧化、加氢、酰胺化、中和、萃取及精制等工序的装置.其基本工艺技术从意大利引进.由于工艺本身的特点,副产物硫铵达3.8吨/吨己内酰胺.该装置设计年产硫氨19万吨,产量较大.……

摘要：为了分析禽致病性大肠杆菌(Avian pathogenic Escherichia coli,APEC)Ⅲ型分泌系统2(*** TypeⅢsecretion system2,ETT2)Eiv C ATPase关键活性位点,本研究通过比对分析病原菌ATPase序列,筛选APEC ETT2 Eiv C的关键位点。然后设计点突变引物,通过PCR方法构建Eiv C点突变片段,构建Eiv C点突变重组表达质粒。经IPTG诱导表达后纯化相应蛋白,并检测其ATPase活性。结果显示,Eiv C蛋白包含F0F1 ATPase的保守序列,且具有ATPase活性。测序结果显示Eiv C第175、199、201、233位氨基酸突变成功,融合蛋白获得成功表达与纯化。然而,点突变与野生型Eiv C的ATPase活性差异不具有显著统计学意义。本研究结果表明第175、199、201、233位氨基酸不影响Eiv C的ATPase活性。

摘要：Objective To develop RT-nPCR assays for amplifying partial and complete VP1 genes of human enteroviruses(HEVs)from clinical samples and to contribute to etiological surveillance of HEV-related *** A panel of RT-nPCR assays,consisting of published combined primer pairs for VP1 genes of HEV A–C and in-house designed primers for HEV-D,was established in this *** sensitivity of each RT-nPCR assay was evaluated with serially diluted virus stocks of five serotypes expressed as CCID50 perμL and copies perμL,and the newly established methods were tested in clinical specimens collected in recent *** The sensitivity of RT-nPCR assays for amplifying partial VP1 gene of HEVs was 0.1 CCID50 perμL and 10 virus copies perμL,and for the complete VP1 gene was 1 CCID50 perμL and 100 virus copies perμL,using serially-diluted virus stocks of five *** a proof-of-concept,25 serotypes were identified and complete VP1 sequences of 23 serotypes were obtained by this system among 858 clinical specimens positive for HEVs during the past eight surveillance *** This RT-nPCR system is capable of amplifying the partial and complete VP1 gene of HEV A–D,providing rapid,sensitive,and reliable options for molecular typing and molecular epidemiology of HEVs in clinical specimens.

摘要：分析了当前配电房立面改造的现状,发现传统设计在环境融合和美观性方面存在不足,为此,提出了一种基于零碳理念的立面改造方法,通过融合自然元素、应用环保材料和集成太阳能光伏板及垂直绿化技术,实现配电房与周围环境的和谐共生。

摘要：目的优化降香挥发油β-环糊精(β-CD)包合的制备工艺。方法考察挥发油利用率,用正交设计法对降香挥发油β-CD包合工艺进行优选。结果降香挥发油与β-CD包合物最佳制备工艺是挥发油(ml)∶β-环糊精(g)为1∶5,在40℃下包合60 min。结论所选取的提取降香挥发油较好,说明本制备工艺适合降香挥发油包合物的制备。

摘要：为判断黑河金盆水库工程大坝右岸斜坡的性质(是变形体或滑坡),并有利于指导工程施工,在进行了详实的野外地质调查之后,作者分析认为该斜坡实际上为一古滑坡。在地表及平硐调查中所见滑坡周界清晰,变形破坏现象明显,为查明滑坡性质提供了客观证据。近两个月的位移监测资料亦进一步证实了上述结论的正确性。在此基础上,考虑到工程的重要性及施工时间的紧迫性,作者建议对底滑面以上的滑坡堆积体予以全部开挖清除。

摘要：A modular approach of the estimation-based design in adaptive linear control systems has been extended to the adaptive robust control of strict-feedback stochastic nonlinear systems with additive standard Wiener noises and constant unknown *** using Itô’s differentiation rule,nonlinear damping and adaptive Backstepping procedure,the input-to-state stable controller of global stabilization in probability is developed,which guarantees that system states are bounded and the system has a robust *** to Swapping technique,we develop two filters and convert dynamic parametric models into static ones to which the gradient update law is *** performance of the system is estimated by the norm of *** of simulation show the effectiveness of the control *** modular design,which has a concise hierarchy,is more flexible and versatile than a Lyapunov-based algorithm.

摘要：Data collection with microcrystals at synchrotron radiation facilities is challenging because it is difficult to harvest and locate microcrystals. Moreover,microcrystals are sensitive to radiation damage; thus, typically, a complete data set cannot be obtained with a single microcrystal. Herein, we report a new method for data collection with multiple microcrystals having a crystal size ranging from 1 to 30 lm. This method is suitable for not only low-temperature(100 K) data collection but also room-temperature data collection. Thin Kapton membranes were used to capture multiple crystals simultaneously. The microcrystals were visible under an optical microscope and easily located because the membrane was transparent and sufficiently thin. The film was fixed to a bracket that was prepared using a three-dimensional printer. The bracket was fixed on a magnetic base via screwing and employed by the goniometer system for data collection. Multiple data sets of fatty acid-binding protein 4(FABP4) and lysozyme microcrystals were collected using this novel designed device. Finally, the structures of protein FABP4 and lysozyme were obtained from these data via the molecule replacement method. The data statistics reveal that this method provides a comparable result to traditional methods such as a nylon loop.