摘要：In this paper,we present the design of a new photonic crystal fiber(PCF)gas sensor for evanescent-field sensing in terahertz(THz)wave *** sensor can be used to identify the gas,and its size is very large,so that it is beneficial to fill it with the test *** on simulation,we demonstrate that the gas sensor using PCFs with four noncircular large holes in the cladding has high sensitivity and low loss,the confinement loss is less than 0.007 dB/m,and the bending loss is very *** new PCF gas sensor can detect kinds of gases,for example,if test gas is water vapor,it has obvious absorption peaks in THz band,and the sensitivities of gas sensor are 64%and 73%at 1.097 THz and 0.752 THz,*** to the ultra-low loss and high sensitivity of the model,the novel steering-wheel structured fiber is very suitable for evanescent-field sensing and the detection of chemical and biological products.

摘要：Network coding is proved to have advantages in both wireline and wireless networks. Especially, appropriate network coding schemes are programmed for underlined networks. Considering the feature of strong node mobility in aviation communication networks, a hop-by-hop network coding algorithm based on ad hoc networks was proposed. Compared with COPE-like network coding algorithms, the proposed algorithm does not require overhearing from other nodes, which meets confidentiality requirements of aviation communication networks. Meanwhile, it does save resource consumption and promise less processing delay. To analyze the performance of the network coding algorithm in scalable networks with different traffic models, a typical network was built in a network simulator, through which receiving accuracy rate and receiving delay were both *** simulation results indicate that, by virtue of network coding, the proposed algorithm works well and improves performance significantly. More specifically, it has better performance in enhancing receiving accuracy rate and reducing receiving delay, as compared with any of the traditional networks without coding. It was applied to both symmetric and asymmetric traffic flows and, in particular, it achieves much better performance when the network scale becomes larger. Therefore, this algorithm has great potentials in large-scale multi-hop aviation communication networks.

摘要：Curvatures are important geometric attributes of surfaces. There are many applications that require as a first step the accurate estimation of curvatures at arbitrary vertices on a triangulated surface. Chen and Schmitt (1992) and Taubin (1995) presented two simple methods to estimate principal curvatures. They used circular arcs to approximate the normal curvature. We find this may cause large error in some cases. In this paper, we describe a more accurate method to estimate the normal curvature, and present a novel algorithm to estimate principal curvatures by simplifying the Chen and Schmitt’s method. Some comparison results are also shown in this paper.

摘要：The current paper presents experimental and computational results to assess the effectiveness of non-axisymmetric endwall contouring in a compressor linear cascade. The endwall was designed by an endwall design optimization platform at 0° incidence(design condition). The optimization method is based on a genetic algorithm. The design objective was to minimize the total pressure losses. The experiments were carried out in a compressor cascade at a low-speed test facility with a Mach number of 0.15. Four nominal inlet flow angles were chosen to test the performance of non-axisymmetric Contoured Endwall(CEW). A five-hole pressure probe with a head diameter of 2 mm was used to traverse the downstream flow fields of the flat-endwall(FEW) and CEW *** the measured and predicted results indicated that the implementation of CEW results in smaller corner stall,and reduction of total pressure losses. The CEW gets 15.6% total pressure loss coefficient reduction at design condition, and 22.6% at off-design condition(+7° incidence). And the mechanism of the improvement of CEW based on both measured and calculated results is that the adverse pressure gradient(APG) has been reduced through the groove configuration near the leading edge(LE) of the suction surface(SS).

摘要：提高的工作温度还原剂敏化染料的太阳能电池(DSC ) 的效率，和有效温度规定保护他们免受不受欢迎的效率损失的伤害。在这个工作，与一个冷却系统装备的一个半透明的 DSC 模块被设计并且构造因为大楼，温度和模块与或没有使处理凉下来的输出性能里的申请被调查。测试结果证明冷却系统能显著地改进发电并且减少模块温度。而且，我们建立了一个数学模型分析模块热表演，并且介绍了使效率凉下来评估冷却效果的概念。模型精确性被验证了在模块温度上利用隧道深度和集体流动率的测量数据，和效果，冷却效率进一步理论上被学习。联合 DSC 模块被发现了在造里有好申请前景综合光电(BIPV ) ，并且数字结果在系统设计是重要的。

摘要：最近的努力集中了于制造和应用程序三维(3-D ) nanoarchitecture 电极，它能展出优秀电气化学的性能。此处，向设计和合成的新奇策略尺寸悦耳、厚度悦耳二维( 2-D ) MnO 2 nanosheets 在上高度传导性一个维( 1-D )脊梁数组被开发了经由一灵巧，一步舞提高了化学洗澡免职( ECBD )在低温度的方法( 50 湡睯物吗？？

摘要：自然界的光合作用有一个显著的特点,即能量传递效率近乎100%.近年来,由于光合作用实验技术的飞速发展,譬如二维光谱实验和单分子泵浦探测实验,其能量传输过程中的量子相干效应已经在实验上得到了证实.传统的非相干理论能够有效计算能量转移效率,如广义的F?rster理论和修正的Redfield理论.然而,为了描述光合作用中的量子相干效应,人们必须利用量子相干理论.例如,除了传统的Redfield理论之外,还有级联运动方程、量子路径积分、相干修正的Redfield理论、小极化子量子主方程、广义Bloch-Redfield理论等.本文综述了上述方法的主要内容,不仅有助于对自然界光合作用中激子能量转移的量子动力学进行有效的量子模拟,并对人工太阳能收集装置的设计提供了一定的指导作用.

摘要：This paper presents the design of 0.5 V multi-gigahertz cascode CMOS LNA for low power wireless communication. By splitting the direct current through conventional cascode topology, the constraint of stacking- MOS structure for supply voltage has been removed and based on forward-body-bias technology, the circuit can operate at 0.5 V supply voltage. Design details and RF characteristics have been investigated in this paper. To verify the investigation, a 0.5 V 5.4 GHz LNA has been fabricated through 0.18 μm CMOS technology and measured. Measured results show that it obtains 9.1 dB gain, 3 dB NF with 0.5 V voltage and 2.5 mW power dissipation. The measured IIP3 is -3.5 dBm. Compared with previously published cascode LNA, it achieves the lowest supply voltage and lowest power dissipation with competitive RF performances.

摘要：The problem of computing a piecewise linear approximation to a surface from its sample has been a focus of research in geometry modeling and graphics due to its widespread applications in computer aided design. In this paper, we give a new algorithm, to be called offset surface filtering (OSF) algorithm, which computes a piecewise-linear approximation of a smooth surface from a finite set of cloud points. The algorithm has two main stages. First, the surface normal on every point is estimated by the least squares best fitting plane method. Second, we construct a restricted Delaunay triangulation, which is a tubular neighborhood of the surface defined by two offset surfaces. The algorithm is simple and robust. We describe an implementation of it and show example outputs.

摘要：β-葡萄糖醛酸苷酶(GUS)在肿瘤的发生、转移和进展中具有关键作用,因而成为一种很有应用前景的癌症生物标志物.在本研究中,我们设计出一种酶激活的近红外荧光探针(DCM-βGlcA),可在体内和体外快速、准确地检测GUS的活性.该探针是由葡萄糖醛酸残基与荧光基团吡喃腈(DCM)衍生物构成.在GUS作用下,该探针在680 nm处具有明显的近红外荧光增强,而且它的斯托克位移达到了150 nm.此外,该探针对于GUS有很高的灵敏度,检测限低至0.19 U L^(-1).我们利用该探针分析了人血清样本中的GUS含量,其结果与ELISA检测结果一致.该探针还可用于示踪活细胞中的GUS,而且能够对荷瘤小鼠体内和肝癌组织中的GUS进行检测成像.因此,该探针可作为检测GUS的理想工具.