A Parameter Identification Method to Determine Salinity of Sea Ice Using Temperature and Thickness Observations

This study is intended to provide a parameter identification method to determine the salinity of sea ice using temperature and thickness measurements. This method is particularly effective when field data are sparse and unsatisfactory due to the difficulties associated with fieldwork, especially during the polar winter. The main idea of the method is described. The salinity profile is calculated by the temperature and thickness observations, which were measured at Nella Fjord around Zhongshan Station, Antarctica during the polar night time by the 22nd Chinese Antarctic Research Expedition. Another simulation for temperature profiles during a different measurement period is performed. Results show that better simulations of the salinity and temperature distributions are possible with the estimated parameters than with Eicken’s and THESCI’s methods. This method will help people to understand the salinity evolution of sea ice more thoroughly.     

基于扫描区间表示的不规则多边形快速定位算法及应用

不规则多边形定位算法是排料算法的重要组成部分,其效率对排料算法的性能有重要影响。基于扫描区间表示的不规则多边形定位算法因能适应任意复杂多边形而被广泛采用,但它存在计算量大的不足。通过深入研究基于扫描区间表示的多边形定位算法,该文从两个方面对其方法进行改进：首先提出候选平移位置矩阵的概念,进而实现定位扫描算法;然后通过最大跨度比较法快速排除一些不可能的行,从而通过减少定位扫描算法的调用次数进一步加速。该算法已应用于自主开发服装排料软件,多个实际衣片数据的测试结果证明了该文算法的有效性和高效性。     

关于RTS24袖珍式温度模拟仪的校准方法探讨

本文通过采用FLUKE1529四通道测温仪以及KEITHLEY2001数字多用表两台测量设备分别对RTS24袖珍式温度模拟仪进行了校准、比对和探讨并对其测量结果分别进行了不确定度评定,从而验证了方法的可行性,以期起到同行人员工作之间的交流和参考作用。     

电能表电快速瞬变脉冲群检测装置研究

针对电能表电快速瞬变脉冲群抗扰度试验,给出一种用于电能表电快速瞬变脉冲群检测装置,设计了一种用于本装置的反馈干扰滤波网络,该网络对电能表电快速瞬变脉冲群抗扰度检验装置产生的反馈残压减少到电能表标准检定装置所能允许的范围之内,使得电能表电快速瞬变脉冲群抗扰度试验顺利进行。     

Effect of solution concentration on surface morphology and photocatalytic activity of ZnO thin films synthesized by hydrothermal methods

ZnO thin films were synthesized via hydrothermal method on silicon substrate at various solution concentrations. The thin films were characterized by X-ray diffraction, field-emission scanning electron microscope and UV–Vis spectrophotometer. The results show that the thin films are polycrystalline with wurtzite hexagonal structure. The T _c values of (101) surface of the thin film increase from 0.929 to 1.840 at first, and then decrease to 0.779 with increasing solution concentration. The preferential orientation along the (101) crystal surface can be controlled by changing the solution concentration. Solution concentration has a significant effect on surface morphology of the thin films. The optical band gap of the thin films decreases, when the solution concentration of zinc nitrate hexahydrate increases from 0.01 to 0.06 mol/L and then increases when the solution concentration of zinc nitrate hexahydrate further increases to 0.08 mol/L. Photocatalytic activity of the thin films on degradation of methyl orange under UV light irradiation was studied in detail. The ZnO thin film with many cracks prepared from 0.01 mol/L shows the higher photocatalytic activity but the tower-like ZnO thin film prepared from 0.08 mol/L reveals the lower photocatalytic activity. Therefore, the photocatalytic activity of the thin films are mainly relate to surface morphology and crystallographic orientation.     

The enhanced ammonia gas-sensing activity of gamma ray irradiated indium vanadate nanoribbons

Indium vanadate (InVO₄) nanoribbons were irradiated with various doses of gamma ray irradiation. The results revealed that the crystal structure remained unchanged after irradiation while the UV–Vis spectra underwent a red-shift with increasing irradiation dose. In addition, gamma ray irradiation enhanced the sensibility of InVO₄-based sensors for ammonia testing. The improved properties of InVO₄-nanobased sensors exposed to irradiation might be ascribed to the defects introduced by gamma ray, making gamma ray irradiation a good approach for material modification.     

Phase structure,piezoelectric properties,and stability of new K0.48Na0.52NbO3–Bi0.5Ag0.5ZrO3 lead-free ceramics

In this work, (1 ? x)(K_0.48Na_0.52)NbO₃–x(Bi_0.5Ag_0.5)ZrO₃ [(1 ? x)KNN–xBAZ] lead-free piezoceramics was prepared by the conventional solid-state method, and a new phase boundary consisting of three phases [e.g., rhombohedral, orthorhombic, and tetragonal (R–O–T) phases] has been constructed by adding both (Bi_0.5Ag_0.5)²⁺ and Zr⁴⁺. The ceramic with x = 0.05 possesses an R–O–T phase coexistence. A large d ₃₃ of ~347 pC/N and a high T _C of ~318 °C have been shown in the ceramic with x = 0.05. In addition, such a ceramic also possesses enhanced thermal and temperature stability of piezoelectricity and ferroelectricity. Both the phase boundary and the grain size play a critical role in large piezoelectricity and good stability. We think that this material belongs to be one of the promising candidates for the high-temperature piezoelectric devices.     

多壁碳纳米管/聚醚砜环氧树脂复合材料的制备及力学性能

环氧树脂具有优异的热性能及力学性能,但本身脆性较大。为制备低成本、高性能的环氧树脂体系,使用聚醚砜（PES）和多壁碳纳米管（MWCNT）对环氧树脂进行增韧,制备了不同PES含量的PES-环氧树脂共混物,讨论了PES含量对环氧树脂力学性能的影响;采用熔融法,并配合使用机械搅拌、高剪切分散和超声分散制备了MWCNT/PES-环氧树脂复合材料,测试了其拉伸性能及断裂韧性,用SEM观察了MWCNT在树脂中的分散状态以及拉伸试样的断口形貌。结果表明：MWCNT的加入能够提高PES-环氧树脂体系的综合力学性能,且当MWCNT含量为0.7wt%时,树脂体系的综合力学性能最好;低PES含量下,小于1.0wt%的MWCNT的加入使材料力学性能超过用20.0wt%PES改性的环氧树脂;PES与MWCNT对环氧树脂具有协同增韧作用。