血液细胞光相位分布特征的虚拟仿真研究

为能够充分利用细胞光散射的全息信息,以更好地对生物细胞类别进行解构,根据血液细胞的光穿透特性,建立了血液细胞中红细胞(RBC)、白细胞(WBC)中粒细胞和非粒细胞的典型细胞光散射模型.借助于数字相位显微(DPM)技术的基本方法和实验条件参数,应用VirtualLabTM光学虚拟仿真实验系统.获得了血液细胞在光散射下的虚拟仿真相位分布和光强分布.针对所获得的相位和光强分布图谱进行了分布特征分析,发现了相位分布直接与细胞形态结构密切相关.该点可作为细胞类别分检的一个新的重要依据,该方法相对于3D重建方法来说计算量少、无需很多的边界条件.这种由细胞相位分布解构细胞形态的检测方法可为提升细胞检测技术和发展检测方法的研究提供一种新突破方向.     

船载卫通天线圆极化方式切换改进方案

对船载卫通天线圆极化状态下A、B极化切换方案进行了分析,阐述了现行切换方案会改变和差通道传输特性,致使跟踪接收机校相值全部作废的缺点。由此提出了在原和差网络的基础上,增加组成B极化和差网络的改进方案,以及将圆极化器单向转动的基础上,增加反方向转动45°的改进方案。这2套改进方案均易于实现,且均克服了现行方案的不足,可在不改变和差通道传输特性的条件下快速完成极化切换。     

一种新的海战场雷达辐射源识别方法

现代海战场电磁环境日趋复杂,使得常规的辐射源识别的方法很难适应实际需要。文章从有源探测的角度出发,提出了一种新的辐射源信息数据库,并采用模糊综合评判方法进行辐射源识别。实验表明,该识别方法具有很强的针对性,识别准确率高;算法简单,实时性强,对现代海战场雷达辐射源识别具有较强的指导作用。     

Simultaneous Optimization of Luminance and Color Chromaticity of Phosphors Using a Nondominated Sorting Genetic Algorithm

Acquiring materials that simultaneously meet two or more conflicting requirements is very difficult. For instance, a situation wherein the color chromaticity and photoluminescence (PL) intensity of phosphors conflict with one another is a frequent problem. Therefore, identification of a good phosphor that simultaneously exhibits both desirable PL intensity and color chromaticity is a challenge. A high‐throughput synthesis and characterization strategy that was reinforced by a nondominated sorting genetic algorithm (NSGA)‐based optimization process was employed to simultaneously optimize both the PL intensity and color chromaticity of a MgO–ZnO–SrO–CaO–BaO–Al₂O₃–Ga₂O₃–MnO system. NSGA operations, such as Pareto sorting and niche sharing, and the ensuing high‐throughput synthesis and characterization resulted in identification of promising green phosphors, i.e., Mn²⁺‐doped AB₂O₄ (A = alkali earth, B = Al and Ga) spinel solid solutions, for use in either plasma display panels or cold cathode fluorescent lamps.     

薄栅氧化层0.25μm RF PDSOI NMOSFETs电离总剂量辐照效应研究

本文研制了一种与0.1μm SOI CMOS工艺兼容的射频PD SOI NMOSFET,并分析了电离总剂量辐照对四种不同结构射频器件的静态特性和频率特性的影响,分别包括前/背栅阈值、泄漏电流、跨导,输出特性以及交流小信号电流增益和最大有效/稳定增益。实验表明,在室温环境下经过总剂量为1Mrad(Si)的g射线辐照,所有的射频PDSOI NMOSFET的静态和射频特性均表现出明显退化,其中以浮体NMOSFET变化最大。虽然损失了部分驱动电流、开关速度和高频特性,LBBC型体接触结构的射频器件仍表现出优于GBBC和BTS型体接触结构的射频器件的抗电离总剂量辐照的能力。     

SF6/O2气氛中SiC ICP刻蚀的微沟槽效应

本文采用SF6 + O2作为刻蚀气体,对单晶6H-SiC 材料的感应耦合等离子体( ICP) 刻蚀工艺进行了研究。着重分析了ICP 功率、偏置电压、气体混合比等工艺参数对微沟槽效应的影响。结果表明,O2的加入对于微沟槽的形成起到了极其重要的作用,微沟槽是加入氧气后形成的SiFxOy中间层的充电造成的。ICP功率与偏置电压的增大会增强微沟槽效应,进一步促进微沟槽的形成,另外入射离子的角度分布也会影响微沟槽的形成.     

A GSPN-Based Approach to Stacked Chips Scheduling Problem

This paper discusses scheduling characteristics unique in stacked chips [including multichip package (MCP) and multidie package (MDP)] production process such as reentrant work flow and synchronization constraint. It also proposes a modeling and analytical framework for stacked chips assembly operations, which is based on the formal framework of generalized stochastic Petri net. This approach allows the seamless integration of the logical and timed dynamics of stacked chip assembly operations in a single representation. Furthermore, the proposed framework supports the analytical representation of the stacked chips scheduling problem as a mathematical programming formulation, which can be effectively solved to optimality through enumerative techniques. The framework presentation and its capabilities are elucidated by detailed application on a small system configuration for MCP.      

一种基于特征点权重的机载InSAR系统区域网干涉参数定标方法

干涉参数外定标可以获取干涉相位偏置,并对干涉系统基线参数进行修正,提高干涉系统3维定位的精度。该文提出了一种新的区域网干涉参数定标算法,该方法采用特征点提取、最优相关匹配技术实现对交互连接的数据块同名点提取;利用加权联合定标技术实现少量控制点条件下干涉数据的参数定标,并对定标结果进行了理论分析。通过对具有不同地貌特征的实测机载数据的处理,验证了处理算法的有效性。     

Rational and Facile Construction of 3D Annular Nanostructures with Tunable Layers by Exploiting the Diffraction and Interference of Light

This paper reports a rational and facile approach to fabricating arrays of 3D annular nanostructures with tunable layers by utilizing the diffraction and interference of UV light. Based on discretized Fresnel bright spots and standing waves formed within a photoresist film, the structures with nanoscale features are realized using simple, conventional photolithography. The 3D annular nanostructures are produced in arrays of single‐, double‐, and triple‐layered ring structures with the height of single layer on a 100 nm scale. The structural formation process and features of the nanostructures are analyzed and explained through 3D modeling that integrates the effects of both UV exposure dose and chemical kinetics. The approach to generating 3D annular nanostructures with tunable layers and discrete heights can be adapted for various applications that require the 3D structures fabricated over a large area with high throughput.     

Metallic Cobalt Nanoparticles Encapsulated in Nitrogen‐Enriched Graphene Shells: Its Bifunctional Electrocatalysis and Application in Zinc–Air Batteries

There has been a continuous call for active, durable, and low‐cost electrocatalysts for a range of energy applications. Among many different nonprecious metal based candidates, transition metal nanoparticles encapsulated in graphene layers have gained increasing attention over recent years. In this study, it is demonstrated that metallic cobalt nanoparticles sheathed by multilayered nitrogen‐enriched graphene shells can be facilely prepared using cobalt‐containing Prussian blue colloids as the single precursor. These metallic cobalt cores can be readily leached out by HCl treatment, resulting in hollow graphene spheres. Products with or without acid leaching exhibit great bifunctional activities for electrocatalytic oxygen reduction and hydrogen evolution in both alkaline and acidic electrolytes. Most importantly, it is found that the removal of the metallic cores does not deteriorate but rather enhances the electrocatalytic performance. Based on this and other experimental observations, Co‐N‐C moieties are proposed as the catalytically active sites. At last, it is shown that these catalysts can be employed as the air catalyst of primary zinc–air batteries with excellent current density, power density, and operation durability.