Automatic 3D Indoor Scene Updating with RGBD Cameras

Since indoor scenes are frequently changed in daily life, such as re‐layout of furniture, the 3D reconstructions for them should be flexible and easy to update. We present an automatic 3D scene update algorithm to indoor scenes by capturing scene variation with RGBD cameras. We assume an initial scene has been reconstructed in advance in manual or other semi‐automatic way before the change, and automatically update the reconstruction according to the newly captured RGBD images of the real scene update. It starts with an automatic segmentation process without manual interaction, which benefits from accurate labeling training from the initial 3D scene. After the segmentation, objects captured by RGBD camera are extracted to form a local updated scene. We formulate an optimization problem to compare to the initial scene to locate moved objects. The moved objects are then integrated with static objects in the initial scene to generate a new 3D scene. We demonstrate the efficiency and robustness of our approach by updating the 3D scene of several real‐world scenes.     

钢渣的基本性质和道路工程中的利用前景

通过对钢渣及钢渣混合料的物理力学及化学性能分析，对钢渣在公路工程各个方面的应用可能性作了分析与探讨，并针对目前应用中存在的技术经济问题提出了解决的思路与办法。     

对我省农药工业发展的浅见

在研究与分析我省农药工业现状的基础上，提出了我省农药发展目标的粗浅意见。     

低孔隙率胶凝材料的孔结构测定方法

本文用压汞法和氦比重仪法测定了低孔隙率胶凝材料的孔结构,结果表明氦孔隙率显著大于汞孔隙串。用两种方法测得的孔隙率与力学性能相关,得到完全不同的拟合参数。在低孔隙率胶凝材料中,大量闭合孔的存在使压汞法出现大的“损失孔隙”。因此,氦孔隙率可以作为低孔隙率胶凝材料的结构参数,而用压汞法可能会导致错误的结论。     

Analysis of the polyethylene glycol glucosides and FA esters thereof by atmospheric-pressure ionization MS

Polyethylene glycol (PEG) glucosides (PEGG) and the PEGG esters of lauric acid were analyzed by atmospheric-pressure ionization MS (API-MS) with electrospray ionization. Straightforward mass characterization of the complex mixtures could be achieved without prior chromatographic separation. The constituents were identified on the basis of quasi-molecular ions. Individual components could be observed as protonated molecular ions [M+H]⁺ and/or as their NH₄ ⁺, Na⁺, or K⁺ adducts in positive ion mode. The mass spectrometric investigation showed that mixtures of PEGG consisted of monoglucoside, diglucoside, polyglucoside, and free PEG. The esterification product is a mixture of two types of nonionic surfactants: PEG-laurates and PEGG-laurates. The reasons for distortion of the quasi-molecular ion intensities and the stabilization of adduct ions were discussed. The rapid and highly sensitive API-MS analysis technique proposed here is well suited for direct characterization of complex mixtures and suitable for development as a routine analytical method.     

改性环氧基减摩材料

介绍了一种塑料基减摩材料,它是以改性环氧树脂为主体,加入固体润滑剂及增强材料等组成,具有较为理想的摩擦学特性。还讨论了固体润滑剂、增强材料对制件摩擦学特性的影响,并展望了它们的应用前景。     

中国钛白工业发展中几个问题的思索

论述了中国钛白工业发展中出现的几个问题，如：钛矿资源不足和采矿能力不足；高钛渣生产装置正在建设中，高钛渣尚未应用于钛白生产；钛白生产厂家过多，生产规模偏小；钛白行业对钛铁矿没有统一的标准等。提出在钛资源方面中国应在加大开采力度的同时，组织从国外进口；应建设高钛渣生产基地；应制定出钛白行业的钛铁矿标准；应建设热、电、化工、钛白联合企业等。     

Aboveground nitrogen in relation to estimated total plant uptake in maize and bean

The main objective of this field study was to estimate the total plant uptake of soil mineral N in maize (Zea mays L.) and common bean (Phaseolus vulgaris L.) grown in crop rotations under different N content in Nicaragua. Secondary objectives were to estimate the fraction of the measured soil mineral N content taken up in this way, and to determine how the measured N in plant aboveground parts was related to the total mineral N uptake. A large variation in N content was obtained by using data from fertilisation experiments. Plant total N uptake was estimated as the residual N in a mass balance calculation of soil mineral N. Mineral N content in the top 0–0.3 m soil layer in the field cultivations and in tubes isolated from root uptake, and N content in aboveground plant parts were measured every 30 days. Estimated plant total uptake of soil mineral N varied considerably (2.5–14 g N m⁻² 30 day⁻¹) over periods and N treatments. The range of variation was similar for maize and bean. The fraction of the soil mineral N that was taken up by the plant daily varied more in maize (about 0.03–0.12 day⁻¹) than in bean (about 0.05–0.08 day⁻¹). Our results suggest that monthly changes in N in aboveground plant parts were linearly related to plant total N uptake during the same period. Aboveground plant N constituted between about 55% and 80% of total uptake of soil mineral N in maize depending on period within season, whereas for bean it was more constant and smaller (about 40%).     

S—94触变性不饱和聚酯树脂的制备和开发

在基体树脂中添加触变剂白炭黑，制成了Ｓ－９４触变性不饱和聚酯树脂。该树脂的触变指数比基体树脂高３倍多，改善了不饱和聚酯树脂的流变性。     

Electrochemical micromachining of nitinol by confined-etchant-layer technique

The confined etchant layer technique has been applied to fabricate complex three-dimensional microstructures on nitinol for the first time. HF and HNO₃ were locally and simultaneously electrogenerated at the mold surface to etch a nitinol workpiece. NaOH was used as an efficient scavenger to confine the etchant close to the mold. Cyclic voltammetry was employed to study the electrochemical behavior of a Pt electrode in the etching solution in order to choose an appropriate potential for etchant generation on the mold. The thickness of the confined etchant layer was estimated to be several micrometers by inspecting the deviation of the sizes of the etched spots from the sizes of those on the microelectrode. Thus, the composition of the electrolyte could be optimized for better etching precision. By optimizing the composition of the electrolyte, complex microstructures on a Pt-Ir mold bearing the logo “XMU” of Xiamen University were successfully fabricated on nitinol. The etched patterns were approximately negative copies of the mold, and the precision of duplication could easily reach the micrometer scale.