摘要：In this work,a series of biodegradable pure iron,Fe–30Mn and Fe–30Mn–Ag alloys were developed by using a rapid solidification technology.A fine a-Fe dendrite was formed in pure iron,resulting in a high compressive yield strength of above 300 *** Fe–30Mn alloy doped with only 1%Ag exhibited a significant increase in the degradation rate in simulated body fluid due to the precipitation of Ag-rich particles in alloy matrix and the induction of the microgalvanic *** addition,the novel Fe–30Mn–Ag alloy also exhibited a good magnetic compatibility and offered a closely approaching requirement for biodegradable medical applications.

摘要：介绍了现行标准时间码IRIG-B码的编码方式,为满足岸船对时应用系统设计要求,提高岸船时间比对精度,对现行标准时间码IRIG-B码信息格式约定进行了重新设计,使新的IRIG-B码不仅携带时间信息,同时携带测量误差信息、位置信息、控制信息,并在信息位中加入检验位。考虑卫星信道的误码特性,利用空余码位进行纠错编码。仿真结果表明,在不增加卫星传输带宽的前提下,BCH编码可提高传输可靠性。

摘要：目的:探讨单眼视准分子激光原位角膜磨镶术(单眼视LASIK)治疗伴有老视的屈光不正对患者视觉质量、生活质量的影响。方法:屈光不正伴老视的患者172例中124例施行单眼视LASIK(主视眼按最佳矫正远视力完全矫正,非主视眼近视者低矫-0.75^-2.00D,远视者过矫0.75~2.00D),35例放弃手术,13例患者双眼全部矫正。观察术后1d;1wk;3mo时的检查结果。结果:术后3mo单眼视LASIK组124例患者双眼远视力0.7~1.2,双眼近视力J1~J3。无因为难以耐受的不适而需要戴镜补充矫正或再次手术者。双眼完全矫正组术后双眼远视力0.7~1.2,双眼近视力J3~J6,8例(62%)视近困难,需配近用眼镜。结论:单眼视LASIK治疗伴有老视的屈光不正安全有效。单眼视治疗在设计手术方案时需根据患者年龄及调节能力、近附加度数、阅读距离、工作性质等综合考虑。

摘要：全谱段多光谱星上信息处理系统应用于某型号多光谱遥感器,由可见光信息处理电路及红外信息处理电路构成。该系统基于推扫成像的遥感器设计方案,通过外同步控制方式,完成了可见光、短中波红外、长波红外探测器的时序控制与驱动、模拟信号采集与处理、数字信号整合与格式编排等功能,具有多焦面同步工作、采集模拟通道多、信噪比高的特点。最终系统共采集32路模拟图像信号,输出量化位数为14 bit,五路串行LVDS输出,单路数据率为30 Mbps。在给定的测试条件下,实验室环境实测可见光通道、短波红外通道信噪比分别达到307和422,中波红外通道、长波红外通道NETD分别达到0.14 K和0.16 K。并使用可见光通道进行了外景成像,得到了良好的图像数据。通过实验室测试及外景成像验证了本系统能够满足遥感器使用需求。

摘要：为解决LTE无线网络信号接收算法难以消除莱斯噪声干扰,致使信号接收过程中信道抖动严重,以及信号追踪精度不高等难题,提出基于二元星座接收映射机制的LTE无线网络信号接收算法。以中央基站为中心,根据LTE网络节点与中央基站之间的拓扑距离关系,设计小区基站接收结构,消除法线方向上的接收错位现象;根据时延的高低,以信号发射节点为中心,按层级将中央基站接收天线进行层次排列,组建节点接收结构,消除切线方向上的接收错位现象,定义相应的映射规则,将节点-小区基站接收结构进行映射,构建二元星座接收映射机制,减缓信道抖动;根据单个信号传输质量高低,构建节点信号质量分组传输机制,提高信号接收质量。仿真结果表明,与IQRA算法、MNPF-HMA算法相比,所提算法的信道抖动时间更短,信道传输质量与信号发射源定位精度更高。

摘要：Mg-Al alloys have excellent strength and ductility but relatively low thermal conductivity due to Al *** accurate prediction of thermal conductivity is a prerequisite for designing Mg-Al alloys with high thermal ***,databases for predicting temperature-and composition-dependent thermal conductivities must be *** this study,Mg-Al-La alloys with different contents of Al2La,Al3La,and Al11La3phases and solid solubility of Al in the α-Mg phase were *** influence of the second phase(s) and Al solid solubility on thermal conductivity was *** results revealed a second phase transformation from Al_(2)La to Al_(3)La and further to Al_(11)La_(3)with the increasing Al content at a constant La *** degree of the negative effect of the second phase(s) on thermal diffusivity followed the sequence of Al2La>Al3La>Al_(11)La_(3).Compared with the second phase,an increase in the solid solubility of Al in α-Mg remarkably reduced the thermal *** the basis of the experimental data,a database of the reciprocal thermal diffusivity of the Mg-Al-La system was established by calculation of the phase diagram (CALPHAD)*** a standard error of±1.2 W/(m·K),the predicted results were in good agreement with the experimental *** established database can be used to design Mg-Al alloys with high thermal conductivity and provide valuable guidance for expanding their application prospects.

摘要：采用红外扫描系统对回转窑燃烧胴体温度进行实时监测的周期较长,所得温度场数据量很大,直接进行传输,效率较低且易出错。为此设计红外回转窑燃烧胴体温度监测系统,介绍系统的构成和原理;采用基于LZ77数据压缩算法的程序对回转窑温度场数据进行传输,并使解压后的数据与原始温度场数据保持一致;同时,设计并实现了工业窑炉燃烧过程的监测界面,包括燃烧过程中各种气体浓度、温度场数据等信息。实践证明:该系统达到了设计要求。

摘要：传统网络主机管理中一般采用SNMP方式来获得设备信息,但SNMP方式并不能提供主机管理中所需的所有设备信息。针对SNMP方式的这一不足,文中提出并设计实现了一种Cli解决方案,该方案采用RMI与XML相结合的技术,通过RMI方式获取设备信息,并通过配置XML文件提取所需的设备信息,从而达到获取SNMP方式所不能获得的设备信息的目的,有效地弥补了SNMP方式的不足。该方案管理方式灵活,配置简单,具有一定的安全性,并在实际运用中被证明是一种行之有效的网络主机管理方案。

摘要：To deal with the stress interference caused by simultaneous propagation of multiple fractures and the wettability reversal and physical property changes of the reservoir caused by fracturing fluid getting in during large-volume fracturing of tight oil reservoirs through a horizontal well, a non-planar 3D fracture growth model was built, wettability reversal characterizing parameters and change of relative permeability curve were introduced to correct the production prediction model of fractured horizontal well, a fracturing design optimization software(Fr Smart) by integrating geological and engineering data was developed, and a fracturing design optimization approach for tight oil reservoirs based on fracture control was worked out. The adaptability of the method was analyzed and the fracture parameters of horizontal wells in tight oil reservoirs were optimized. The simulation results show that fracturing technology based on fracture control is suitable for tight oil reservoirs, and by optimizing fracture parameters, this technology makes it possible to produce the maximum amount of reserves in the well-controlled unit of unconventional reservoirs. The key points of fracturing design optimization based on fracture control include increasing lateral length of and reducing the row spacing between horizontal wells, increasing perforation clusters in one stage to decrease the spacing of neighboring fractures, and also avoiding interference of old and new fracturing wells. Field tests show that this technology can increase single well production and ultimate recovery. Using this technology in developing unconventional resources such as tight oil reservoirs in China will enhance the economics significantly.

摘要：The aim of this study was to establish a quality-control method for calcineurin subunit B(CNB) biological activity determinations. CNB enhances the p-nitrophenylphosphate(p NPP) dephosphorylating activity of calcineurin subunit A Δ316 mutant(CNAΔ316). A series of CNB concentrations were fitted to a four-parameter equation to calculate the corresponding p NPP maximum dephosphorylation rates. Values were calculated based on biological activity references using a parallel line method. The method was then validated for accuracy, precision, linearity, linear range, sensitivity, specificity, and robustness. The recovery results were greater than 98%. Intra-plate precision was 6.7%, with inter-plate precision of 10.8%. The coefficient of determination was greater than 0.98. The linear range was 0.05–50 μg m L?1, with sensitivity of 50 μg m L?1. Tested cytokines did not induce CNAΔ316 dephosphorylation of p NPP. The chosen CNAΔ316 concentration range did not affect activity determinations.