超声辅助醇沉法制备淀粉纳米颗粒同步包埋叶黄素

为制备叶黄素淀粉纳米颗粒(SNPs-叶黄素)，以木薯淀粉为原料，叶黄素醇溶液为非溶剂相，通过超声辅助醇沉法制备淀粉纳米颗粒，同步实现对叶黄素的包埋负载。合理平衡叶黄素包埋量及包埋率两个目标参数，在质量分数为3%淀粉乳、叶黄素溶液质量浓度1 mg/mL、淀粉乳与叶黄素醇溶液体积比3∶10条件下，对叶黄素的包埋量达(57.62±0.36)mg/g，包埋率(40.33±0.56)%。场地发射扫描电镜显示同步包埋叶黄素未对淀粉纳米颗粒形貌产生显著影响，均为表面光滑的球状或椭圆状颗粒。激光纳米粒度仪显示SNPs-叶黄素尺寸分布在200～600 nm范围。傅里叶红外光谱显示SNPs-叶黄素在2 856 cm-1处出现叶黄素的C-H特征峰，在1 645 cm-1处H-O-H的振动发生蓝移。X射线衍射显示，与SNPs的大包峰相比，SNPs-叶黄素在7.8，13.1和20.9出现V型淀粉特征衍射峰。贮藏稳定性试验表明，在30 d内，室温(25 ℃)和升温条件下(50 ℃)，SNPs-叶黄素中叶黄素的保留率高于叶黄素原料药。     

贮氢负极的电化学交流阻抗特性研究

通过试验测得金属氢化物电极的电化学交流阻抗谱（ＥＩＳ），经过分析得到该电极的等效电路图。为了分析电极在不同状态下的阻抗及不同种类电极的阻抗，ＥＩＳ被用于其分析：（１）不同带电态的电极；（２）不同集流体电极；（３）不同化成态的电极。试验结果表明：（１）随放电深度的增加，电荷传递阻抗Ｒ７有先减小后增大的趋势，温伯格阻抗对应电导逐渐减小；对此进行了理论分析；（２）泡沫镍在电极中起到的集流作用不一定明显优于冲孔镍带，但可能由于镍的电催化作用，能减小电极反应的电子转移步骤阻抗；（３）以充放电方式的电化学化成主要是减小电荷转移阻抗，而对温伯格阻抗无明显影响。     

An edge preserved image compression technique

An image compression technique that can preserve edges of objects is proposed here. This technique is developed by looking at small local regions of the image and classifying these regions as uniform, point, line or edge patterns from statistical likelihood ratio tests. The compression ratio depends on the size of the local region considered and the quality of the image will degrade as the size of the local region increases. Experimental results show good quality preservation when the sizes of the local region are 3 × 3, 4 × 4, 5 × 5 with the corresponding compression ratios less than or equal to 7/24, 1/5, 13/100 respectively. A comparison with discrete cosine transform is given here and shows that the new technique produces better quality in most cases.     

多功能复合肥及其施用效果

介绍了一种多功能复合肥的生产工艺、性能及其施用效果 。     

关于贺州市平桂管理区城投服务大厦施工质量与安全控制的几点体会

通过介绍广西壮族自治区贺州市平桂管理区城投服务大厦工程施工质量与安全控制,特别是基础工程、挡土墙工程、模板及脚手架工程、装饰装修工程等,指出一些工程施工质量与安全控制问题,并提出相应的控制措施,以供借鉴.     

Non-equilibrium extrapolation method in the lattice Boltzmann simulations of flows with curved boundaries (non-equilibrium extrapolation of LBM)

The fraction of the intersected link in fluid region is an important parameter in non-equilibrium extrapolation method (NEM) in the lattice Boltzmann study since the NEM adopts different extrapolation schemes when the fraction reaches a critical value. In the present study, effect of the critical value of the fraction on the lattice Boltzmann simulations of flows with curved boundaries is investigated. The flows around a single cylinder and two parallel-placed cylinders under uniform incoming streaming are chosen as typical cases. For these given flows, small critical value of the fraction causes the lattice Boltzmann simulation to suffer severe numerical instability. Moreover, the numerical results also show that large critical value of the fraction can result in more accurate numerical results for flows under large Reynolds numbers, while the numerical accuracy is almost independent of the critical value for flows under small Reynolds numbers.     

Anodization of nanoporous alumina on impurity-induced hemisphere curved surface of aluminum at room temperature

Nanoporous alumina which was produced by a conventional direct current anodization [DCA] process at low temperatures has received much attention in various applications such as nanomaterial synthesis, sensors, and photonics. In this article, we employed a newly developed hybrid pulse anodization [HPA] method to fabricate the nanoporous alumina on a flat and curved surface of an aluminum [Al] foil at room temperature [RT]. We fabricate the nanopores to grow on a hemisphere curved surface and characterize their behavior along the normal vectors of the hemisphere curve. In a conventional DCA approach, the structures of branched nanopores were grown on a photolithography-and-etched low-curvature curved surface with large interpore distances. However, a high-curvature hemisphere curved surface can be obtained by the HPA technique. Such a curved surface by HPA is intrinsically induced by the high-resistivity impurities in the aluminum foil and leads to branching and bending of nanopore growth via the electric field mechanism rather than the interpore distance in conventional approaches. It is noted that by the HPA technique, the Joule heat during the RT process has been significantly suppressed globally on the material, and nanopores have been grown along the normal vectors of a hemisphere curve. The curvature is much larger than that in other literatures due to different fabrication methods. In theory, the number of nanopores on the hemisphere surface is two times of the conventional flat plane, which is potentially useful for photocatalyst or other applications.PACS: 81.05.Rm; 81.07.-b; 82.45.Cc.     

Mechanism of photoconductivity gain and persistent photoconductivity for diamond photodetector

Photoconductivity gain (PG) and persistent photoconductivity (PPC) properties observed in diamond photodetector are theoretically explained by solving rate equations which describe capture and emission processes of photo-generated hole and electron through a boron acceptor and a hole trap in a diamond epilayer and a nitrogen donor in a diamond substrate. Formation of one-sided pn-junction between the epilayer and substrate and slow hole capture rate of acceptor and hole trap levels provide accumulation of photo-generated hole in the epilayer, which produces the PG larger than the ideal responsivity. The PPC current after turning off the deep ultraviolet light is interpreted as due to the slow hole capture rate of the acceptor and trap levels.