AgBiVMo oxide catalytic membrane for selective oxidation of propane to acrolein

A metal ions (Ag, Bi, V, Mo) modified sol–gel method was used to prepare a mesoporous Ag_0.01Bi_0.85V_0.54Mo_0.45O₄ catalytic membrane which was used in the selective oxidation of propane to acrolein. By optimizing the preparation parameters, a thin and perfect catalytically active membrane was successfully prepared. SEM results showed that the membrane thickness is 5 μm. XRD results revealed that Ag_0.01Bi_0.85V_0.54Mo_0.45O₄ with a Scheelite structure, which is catalytically active for the selective oxidation of propane to acrolein, was formed in the catalytic membrane only when AgBiVMoO concentrations were higher than 40%. Catalytic reaction results demonstrated that the selective oxidation of propane could be controlled to a certain degree, such as to acrolein, in the catalytic membrane reactor (CMR) compared to the fixed bed reactor (FBR). For example, a selectivity of 54.85% for acrolein in the liquid phase was obtained in the CMR, while only 8.31% was achieved in the FBR.     

杆塔垂直接地装置冲击特性的频域分析方法

杆塔接地装置对输电线路的的安全稳定运行起着至关重要的作用,其冲击特性是考量杆塔防雷效果的重要参数。笔者基于矩量法和电路理论,以接地体的漏电流为未知量,建立接地网数值计算模型对杆塔接地装置的冲击特性进行频域分析。通过CDEGS软件计算结果进行对比,验证算法的有效性;着重计算杆塔垂直接地装置的冲击阻抗,分析垂直接地极长度对接地装置冲击特性的影响。     

Logo detection with extendibility and discrimination

Logos are specially designed marks that identify goods, services, and organizations using distinguished characters, graphs, signals, and colors. Identifying logos can facilitate scene understanding, intelligent navigation, and object recognition. Although numerous logo recognition methods have been proposed for printed logos, a few methods have been specifically designed for logos in photos. Furthermore, most recognition methods use codebook-based approaches for the logos in photos. A codebook-based method is concerned with the generation of visual words for all the logo models. When new logos are added, the codebook reconstruction is required if effectiveness is a crucial factor. Moreover, logo detection in natural scenes is difficult because of perspective tilt and non-rigid deformation. Therefore, this study develops an extendable, but discriminating, model-based logo detection method. The proposed logo detection method is based on a support vector machine (SVM) using edge-based histograms of oriented gradient (HOGE) as features through multi-scale sliding window scanning. Thereafter, anti-distortion affine scale invariant feature transform (ASIFT) is used for logo verification with constraints on the ASIFT matching pairs and neighbors. The experimental results using the public Flickr-Logo database confirm that the proposed method has a higher retrieval and precision accuracy compared to existing model-based methods.

     

聚合物合成及成型加工中协同学的应用

综述了协同学在聚合物领域的最新研究进展，介绍了加工制备一些聚合物合成及复合材料所显示出的协同效应，以及用协同学方法定量求解一类合成反应体系的动力学模型。提出通过改变振动力场等作用方式，在聚合物动态塑化成型加工时，协同学方法具有广阔的应用前景。     

新型不锈钢化学抛光剂工艺研究

叙述了一般不锈钢化学抛光溶液的基本类型和在实际应用中存在的问题。着重论述MW－6不锈钢化学抛光剂的工艺研究过程、工艺条件、质量指标及检测方法，同时介绍了它与传统不锈钢化学抛光剂的比较，经验价值，表面质量控制，应用领域及应用前景。     

普通用途防撕裂钢丝绳芯输送带的研制

介绍了普通用途防撕裂钢丝绳芯输送带的研制。主要包括纵向骨架材料的选择、横向增强层（防撕裂层）的选择、覆盖胶和芯胶及贴胶配方的设计和实际生产工艺。经过试验测试，产品性能符合HG3646－1999标准。该产品已获国家专利。     

环保型聚氨酯涂料的研究进展

综述了环保型聚氨酯固化剂品种、性能与应用,阐述了水性聚氨酯涂料分类、制备方法和改性研究以及聚氨酯粉末涂料和有机硅聚氨酯功能涂料的改性研究进展。讨论了聚氨酯固化剂中游离单体脱除的工艺和方法,建议采用聚合与高效分离技术相结合的方法降低聚氨酯固化剂中残留游离异氰酸酯单体含量。指出聚氨酯涂料的发展趋势为进一步完善高固体含量羟基树脂的制备技术,发展无异氰酸酯基的潮固化聚氨酯涂料,充分利用可再生的植物油制备无溶剂聚氨酯涂料。     

有序介孔碳材料的模板化构筑及水处理应用研究

介孔碳材料是指孔径介于2 nm-50 nm的一类多孔碳材料。有序介孔碳材料，具有比表面积高、孔道结构规则有序、孔径分布狭窄、孔径大小可调控、表面易于修饰等结构特点和高机械强度、强吸附能力、化学惰性等性能特点，在诸多领域得到了广泛应用，特别是其作为新型吸附剂在水处理领域具有广阔的发展前景。有序介孔炭材料的制备方法主要有硬模板法和软模板法。模板和碳源的选择是控制有序介孔碳材料结构和性能的关键因素。本文从有序介孔硅、天然矿物、MOFs材料、嵌段共聚物等不同模板的角度对有序介孔碳、多级有序微/介孔碳、多级有序大/介孔碳的制备方法进行综述，并对有序介孔碳材料在水处理领域的应用进行简单介绍。     

微生物处理含铬(Ⅵ)废水的研究进展

文章综述了国内外微生物法处理含铬(Ⅵ)废水的研究进展，介绍了以非生物活性的微生物体为铬(Ⅵ)的吸附剂的失活微生物体吸附法及应用活体微生物的活体微生物法，活体微生物法在吸附剂的制备及处理效果等方面都具有更好的实际应用价值。文章同时指出了该法目前存在的一些问题，认为培养和应用高效工程菌是将来的发展方向。     

聚磷酸铵合成工艺条件研究

在常压条件下研究以湿法磷酸生产的磷酸二氢铵和尿素为原料生产聚磷酸铵的合成工艺条件，得到较温和的合成低聚合度聚磷酸铵的工艺参数。通过正交试验对聚磷酸铵的聚合条件进行了优化，得到了最佳工艺条件：反应温度160℃，反应时间1．5h，原料配比（磷酸二氢铵与尿素物质的量比）为1：1．1。在最佳工艺条件下合成的聚磷酸铵的聚合度达到了34，氨氮含量和有效磷含量分别为16．65％和70．20％（均为质量分数）。