微生物降解原油发酵液中低分子量有机酸的测定

本文使用气-质联用仪对微生物降解原油发酵液中低分子量有机酸进行测定。采用水蒸汽蒸发法蒸出发酵液中低分子量有机酸，从而使其与样品中大量的无机盐和表面活性剂分离，浓缩后直接进样。该方法简单直接，可以减少有机酸的损失。     

Coupling-and-decoupling: A hierarchical model for occlusion-free object detection

Handling occlusion is a very challenging problem in object detection. This paper presents a method of learning a hierarchical model for X-to-X occlusion-free object detection (e.g., car-to-car and person-to-person occlusions in our experiments). The proposed method is motivated by an intuitive coupling-and-decoupling strategy. In the learning stage, the pair of occluding X?s (e.g., car pairs or person pairs) is represented directly and jointly by a hierarchical And–Or directed acyclic graph (AOG) which accounts for the statistically significant co-occurrence (i.e., coupling). The structure and the parameters of the AOG are learned using the latent structural SVM (LSSVM) framework. In detection, a dynamic programming (DP) algorithm is utilized to find the best parse trees for all sliding windows with detection scores being greater than the learned threshold. Then, the two single X?s are decoupled from the declared detections of X-to-X occluding pairs together with some non-maximum suppression (NMS) post-processing. In experiments, our method is tested on both a roadside-car dataset collected by ourselves (which will be released with this paper) and two public person datasets, the MPII-2Person dataset and the TUD-Crossing dataset. Our method is compared with state-of-the-art deformable part-based methods, and obtains comparable or better detection performance.     

Efficient object detection based on selective attention

In this paper, we make use of biologically inspired selective attention to improve the efficiency and performance of object detection under clutter. At first, we propose a novel bottom-up attention model. We argue that heuristic feature selection based on bottom-up attention can stably select out invariant and discriminative features. With these selected features, performance of object detection can be improved apparently and stably. Then we propose a novel concept of saccade map based on bottom-up attention to simulate the saccade (eye movements) in vision. Sliding within saccade map to detect object can significantly reduce computational complexity and apparently improve performance because of the effective filtering for distracting information. With these ideas, we present a general framework for object detection through integrating bottom-up attention. Through evaluating on UIUC cars and Weizmann–Shotton horses we show state-of-the-art performance of our object detection model.     

DTPA-双(3,5-二甲氧基-4''''-氨基二苯乙烯)的合成

以3,5-二甲氧基苄溴为起始原料,通过Witting-Hornor反应,再经Fe/HCl还原,合成了3,5-二甲氧基-4'-氨基二苯乙烯.再与DTPAA反应得到标题化合物,其结构经IR、MS、1HNMR、元素分析确证.     

上海地区不同商品粉煤灰水泥浆体的流变性能

采集了上海地区不同种类，等级和加工方式的7种商品粉煤灰，测定了种各种粉煤灰水泥浆体的流变性能，研究了商品粉煤灰品质与掺量对浆体流变参数的影响，并分析了影响浆体流变性能的粉煤灰主要品质因素。     

合成丁酸异戊酯的新方法

采用超强酸代替浓硫酸作催化剂，对丁酸异戊酯合成反应进行了研究，讨论了影响收率的多种因素，在最佳条件下，酯化反应时间短，催化剂可以重复使用，丁酸异戊酯收率达到９８％。     

Preparation and properties of heterocyclically conjugated poly(3‐hexylthiophene)–clay nanocomposite materials

A series of heterocyclically conjugated polymer–clay nanocomposite (PCN) materials that consisted of organic poly(3‐hexylthiophene) (P3HT) and inorganic montmorillonite (MMT) clay platelets were prepared by in situ oxidative polymerization with FeCl₃ as an oxidant. The as‐synthesized PCN materials were characterized by Fourier transform infrared (FTIR) spectroscopy, wide‐angle powder X‐ray diffraction (WAXRD), and transmission electron microscopy (TEM). The effects of the material composition on the anticorrosion, gas barrier, thermal stability, flammability, mechanical strength, and electrical conductivity properties of the P3HT and PCN materials were studied by electrochemical corrosion measurements, gas‐permeability analysis (GPA), thermogrametric analysis (TGA), limiting oxygen index (LOI) measurements, dynamic mechanical analysis (DMA), and a four‐point probe technique, respectively. The molecular weights of extracted and bulk P3HT were determined by gel permeation chromatography (GPC) with THF as an eluant. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3438–3446, 2004     

高性能商品砂浆的制备与研究

高性能商品砂浆是一种可持续发展的新型建材产品,可解决建筑砂浆施工的多种质量问题.介绍了NCS系列商品砂浆的工作性能、凝结时间、含气量、强度及其抗渗性能.这些性能研究表明NCS系列商品砂浆明显优于普通砂浆,符合建筑砂浆的施工和质量要求,具有广阔的应用前景.     

Effect of dynamic vulcanization on the microstructure and performance of polyethylene terephthalate/elastomer blends

Blends of polyethylene terephthalate (PET) and ethylene‐ethyl acrylate‐maleic anhydride terpolymer (E‐EA‐MAH) were dynamically crosslinked in a one‐step extrusion process. An amine‐terminated glycol reacting with MAH moieties was used as the crosslinking agent. The effect of blend composition and dynamic crosslinking on the microstructure and mechanical properties were investigated. Blend ratios ranging from 80:20 to 20:80 PET/E‐EA‐MAH were studied. The region of phase inversion was located for uncrosslinked and dynamically crosslinked blends. The rheological characterization was also carried out for these blends in comparison with the neat materials. After dynamic crosslinking, the phase inversion is shifted from the 30–40% range to the 70–80% range of elastomer content. This shift is induced by the increase of viscosity and elasticity of the network formed. Dynamically crosslinked blends show significant improvements in impact strength but also exhibit a decrease in elongation at break.     

写实人物瓷画

着重论述写实人物瓷画创作要获得形神兼备的艺术效果,必须掌握的问题和运用的有效方法。