摘要：本文以海参蒸煮液为主要原料,大米汁为次要原料,并辅以柠檬、玫瑰和红枣,利用感官评价和响应面实验设计相结合的方法,研制出色泽均匀、风味独特的海参蒸煮液营养饮料,并通过GC-MS对该饮料的风味成分进行了鉴定。结果表明,该营养饮料中海参蒸煮液与大米汁的最佳体积比为2∶1,各辅料的最适添加量为柠檬汁0.20%,玫瑰汁15.86%,红枣汁12.40%。饮料中共检出32种挥发性成分,主要为烃类、酸类、吡嗪类及酯类,在所有挥发性成分中姥鲛烷、角鲨烯、十三酸和D-柠檬烯相对含量最高,赋予饮料一种偏向新鲜柠檬样香气的清甜香气。该海参蒸煮液营养饮料的研制能够为海参的综合加工利用提供一定的技术指导,对丰富海参制品的种类具有重要意义。

摘要：目前,用于地下电缆射频识别(radio frequency identification,RFID)探测定位的传统紧密型线圈天线的性能不足严重制约了其探测定位距离的提高。提出了一种新型高场强分散型RFID线圈天线结构,在推导天线相关电气参数的基础上,以天线的磁场强度为目标函数,以其品质因数固定为约束条件,采用粒子群算法对天线的匝数和相邻两匝之间的匝间距进行了优化。最后,搭建了实验测试平台,测试结果表明,与传统紧密型RFID线圈天线相比,所设计的分散型RFID线圈天线将读取距离提高了33.3%,同时明显增强了相同距离下的标签返回信号强度(received signal strength indication,RSSI),有助于提高基于RSSI的地下RFID定位方法的精度,这为地下电缆RFID探测定位的应用提供重要参考。

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：火力发电机运行状态直接影响火力发电站的生产和安全运行,为实现发电机早期故障的及时诊断,设计基于GPRS的火力发电机状态远程监测系统。采集火力发电机运行状态信号数据,利用GPRS无线通信网络将数据安全传送至监控模块;监控模块接收该数据后,采用流形半监督K均值聚类算法,计算并分析该数据,实现发电机故障诊断,并进行故障预警,并将预警结果可视化呈现在界面中。测试结果显示:该系统可采集发电机在不同时刻下的运行状态数据;可靠监测不同运行工况下发电机的运行状态;当发电机的故障残差绝对值为0.0552时,逼近设定预警值,则系统发送预警,满足火力发电机状态远程监测需求。

摘要：四川省某城镇污水处理厂出水水质原来执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级B标准，随着城镇污水排放要求的提高，提标改造势在必行。该污水处理厂原采用“格栅井+调节池+水解酸化池+接触氧化池+二沉池+紫外线消毒”工艺，结合实际出水水质数据中总氮超标的特点，在原二沉池后、紫外线消毒渠之前增加“高效沉淀池+反硝化滤池”组合。项目出水满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准，可为同类型城镇污水处理厂提标改造提供设计参考。

摘要：BACKGROUND： The potential application of decellularized liver scaffold for liver regeneration is limited by severe shortage of donor organs. Attempt of using heterograft scaffold is accompanied with high risks of zoonosis and immunological rejection. We proposed that the spleen, which procured more extensively than the liver, could be an ideal source of decellularized scaffold for liver regeneration. METHODS： After harvested from donor rat, the spleen was processed by 12-hour freezing/thawing ×2 cycles, then circulation perfusion of 0.02% trypsin and 3% Triton X-100 sequentially through the splenic artery for 32 hours in total to prepare decellularized scaffold. The structure and component characteristics of the scaffold were determined by hematoxylin and eosin and immumohistochemical staining, scanning electron microscope, DNA detection, porosity measurement, biocompatibility and cytocompatibility test. Recellularization of scaffold by 5×106 bone marrow mesenchymal stem cells（BMSCs） was carried out to preliminarily evaluate the feasibility of liver regeneration by BMSCs reseeding and differentiation in decellularized splenic ***： After decellularization, a translucent scaffold, which retained the gross shape of the spleen, was generated. Histological evaluation and residual DNA quantitation revealed the remaining of extracellular matrix without nucleus and cytoplasm residue. Immunohistochemical study proved the existence of collagens I, IV, fibronectin, laminin and elastin in decellularized splenic scaffold, which showed a similarity with decellularized liver. A scanning electron microscope presented the remaining three-dimensional porous structure of extracellular matrix and small blood vessels. The poros-ity of scaffold, aperture of 45.36±4.87 μm and pore rate of 80.14%±2.99% was suitable for cell engraftment. Subcutaneous implantation of decellularized scaffold presented good histocompatibility, and recellularization of the splenic scaffold demonstr

摘要：轻小型多旋翼无人机云台是一种复杂机电伺服系统,要求兼具轻质量与快响应等机电特性。本文针对传统方法在机电伺服系统中设计的不足,以轻小型多旋翼无人机云台为研究对象,提出一种针对系统带宽的机电多目标优化设计方法。方法中,系统结构部分通过灵敏度分析得到7个尺寸设计参数,并以一阶模态和质量为目标进行优化;系统控制部分以速率环和位置环控制器参数为设计变量,并以上升时间、调节时间和绝对积分误差(Integral Absolute Error,IAE)为目标进行优化。在优化设计中,将近似模型与多目标遗传算法相结合,以降低优化复杂度、并提高优化效率及全局寻优能力。对方法进行仿真分析,结果表明:相比初始结构系统和控制系统模型,采用机电多目标优化设计方法后,结构部分质量降低了8.8%,控制部分IAE型积分误差、调节时间及上升时间等主要性能参数分别降低了54.8%、81.9%和53.4%。最后采用锤击法对云台结构进行模态实验,实验得到的一阶模态频率与优化结果的误差为13.4%。说明提出方法可有效实现云台系统机电总体多目标优化。

摘要：针对超表面在透镜方面的应用,基于各向异性超表面单元设计了一款高极化纯度的聚焦超表面透镜,并探讨了其在高增益高极化纯度天线方面的应用.设计了一款具有极化滤波特性的各向异性超表面单元,单元对x极化波保持高透性的同时,对y极化波保持近乎为零的透射率.利用该型单元设计了焦距为30 mm、阵列大小为105 mm×105 mm、单元数为21×21的聚焦超表面透镜.根据光路可逆原理,焦点处发出的球面波被超表面透镜有效转化为平面波,从而达到提高天线增益的目标.实验中分别用不同极化形式的球面波照射聚焦超表面来研究超表面对不同极化波的控制特性.结果表明,x极化波照射时,超表面工作于透镜模式,球面波转化为平面波,天线增益大大提高;y极化波照射时,超表面类似于金属板,将入射波全部反射;x/y极化混合波照射时,天线增益大大提高,且极化隔离度高于25 dB,充分说明设计的聚焦超表面在提高x极化波增益的同时可高效滤除y极化波,达到了高增益高极化纯度的目标.

摘要：研究了分布式捷联姿态基准中与各捷联姿态基准的IMU相对应的各数据采集系统(DAS)的设计方法。设计时,对挠性陀螺仪的输出采用以∑-△型ADC为基础的A/D转换的量化方案,对石英挠性加速度计的输出采用I/F转换的量化方案并设计了相应的基于CPLD的高性能多路脉冲信号采集器。由于每个DAS是分布式系统中的一个节点,因此为DAS设计了CAN接口。为便于DAS的开发、软件升级和现场调试等,所设计的DAS具有ISP功能。文中着重讨论了提高∑-△型ADC应用精度的方法及基于CPLD的高性能多路脉冲信号采集器的设计方法。测试表明DAS的模拟输入通道在采样率为100Hz时的转换精度接近18位,DAS的计数输入通道的计数精度与理论值一致,DAS的CAN接口工作正常、可靠。

摘要：提出了利用紧凑型静电加速管对强流相对论电子束进行加速的概念。通过理论分析及粒子模拟,对1kA、500kV的初始入射电子束,在约0.8m的加速段加速使其达到10MeV,在没有聚束磁场的前提下电子束可以得到传输和加速。通过优化设计可使加速腔的最大场强降为20MV?m?1。