泸天化的“三大”发展战略

本文简述了泸天化实施“三大”即“大公司、大集团、大基地”发展战略的意义，目标和主要任务。     

构件相似性识别的搜索矩阵法

构件的相似性识别是方案创新设计中避免同构方案的关键问题之一。基于图论中广度优先搜索算法,针对运动链再生创新设计中构件的相似性判断,提出了一种新的相似性判断方法——搜索矩阵法。首先根据邻接矩阵对运动链中某构件为树根进行广度优先搜索,产生赋权广度优先生成树,并将每层搜索到的构件运动副序列形成对应的广度优先搜索矩阵,然后根据两构件搜索矩阵是否相同来识别两构件是否相似。该方法具有操作简单、可靠性好、识别率高又易于计算机实现等特点。通过实例验证了这种方法的有效性和完备性。     

Conceptual design of a Moon-based Earth radiation observatory

An Earth radiation observatory on the nearside of the Moon could provide long-term measurements complementary to the satellite-based Earth radiation observation data. This study is intended as a preliminary step towards the design of a Moon-based Earth Radiation Observatory (MERO) and its instrumentation. Based on the analysis of data from the JPL Horizons Ephemeris System for an 18.6-years precession cycle, we show that due to the irregularities of the lunar orbit, for a MERO to maintain an all-time whole Earth disk coverage, it needs to be located within the region of 80.5º W–80.5º E and 81.5º S–81.5º N on the nearside of the Moon and requires a minimum angular instantaneous field of view of 2.07º. Additionally, it should have a 360º horizontally and 15.5º vertically orientation adjustability. On one hand there is a risk for a MERO instrument to receive direct sunlight which might excess the radiation allowance of the sensor; on the other hand, a MERO would have a better polar coverage than does a low orbit spacecraft borne Earth observatory. Within the deployable region, a multi-station MERO network may increase the instantaneous spatial coverage by up to around 10% with abundant overlaps to facilitate inter calibration and validation.     

农药中间体R-（＋）-2-（4-羟基苯氧基）丙酸酯合成工艺条件的研究

近年来,杂环农药和光学活性农药成为世界各大公司研发的热点,高效氟吡甲禾灵是此类农药最具代表性的品种之一。本文介绍的是高效氟吡甲禾灵中间体OP[R-（＋）-2-（4-羟基苯氧基）丙酸酯]的合成工艺,分析了合成工艺条件对OP含量的影响,并对其工艺条件进行了研究,通过大量的实验对比得出了最佳的工艺条件———以物料中R-（＋）...     

不同掺和料对水泥水化热的影响

粉煤灰、磷矿渣和硅粉对水泥的水化热都有一定的影响.单掺粉煤灰可以降低水泥水化热;单掺硅粉提高水泥水化热;复掺粉煤灰和硅粉对水泥水化热影响不大;单掺磷矿渣对水泥水化热降低不大.结合不同工程的实际情况,综合考虑多种因素,选择合适的掺和料是提高混凝土性能,降低成本的有效途径之一.     

Enhanced Coercivity of CaLaCo‐Doped SrM Hexaferrites by Microwave‐Calcination Technique

The effects of microwave calcination (MC) and conventional muffle furnace calcination (CC) on the microstructure and magnetic properties of M‐type hexagonal ferrite Ca_0.15La_0.39Sr_0.46Fe_11.7Co_0.3O₁₉ were investigated. The phase composition, microstructure, and magnetic properties of calcined materials were examined using X‐ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometry. Experiments indicated that the MC method can achieve both pure phase, and fine and uniform grains for both calcined and sintered M‐type hexaferrites. MC treatments resulted in a magnetization at 15 kOe of 67 emu/g and an increase in coercivity by 12% over the CC technique. The improved magnetic properties resulting from microwave‐assisted calcination were attributed to the formation of a fine‐grained morphology, which yielded a narrow grain size distribution. The microwave calcinating technique was shown here to possess unique potential for fabrication of high‐performance ferrites and possibly other ceramics.     

工科化学专业毕业实习改革模式初探

在市场经济转型的环境中,高校办学面临扩招以及经费不足造成的压力,致使工科化学专业毕业实习难以正常进行,因此对毕业实习模式进行改革势在必行。我院探索了仿真实训、毕业实习与就业一体化以及毕业实习与毕业设计一体化三种新的模式。经过实践证明,这三种模式均有效地提高了人才培养质。     

Temperature-sensitive biodegradable mixed star-shaped block copolymers hydrogels for an injection application

3-arm star-shaped poly(d,l-lactic-co-glycolic acid)-b-methoxy poly(ethylene glycol)(3sPLGA-mPEG) and 4sPLGA-mPEG copolymers are synthesized via the arm-first method. A facile method to obtain a temperature-sensitive physical injectable hydrogel is found using simply mixing two 4sPLGA-mPEG block copolymers aqueous solutions individually with thermogelling property (sol-gel-sol transition) or using simply mixing an aqueous sol of a 3sPLGA-mPEG block copolymer with a precipitate of a similar 3sPLGA-mPEG copolymer but with a varying PLGA/mPEG block ratio. A dramatic tuning of the sol–gel transition temperature is conveniently achieved by merely changing mix ratios. The degradation of mixed 3sPLGA-mPEG hydrogel proceeds by hydrolysis of ester bonds followed by the erosion of gel in PBS solution at body temperature for nearly 50 days. The mass loss and reduction of molecular weight are detected with increasing degradation time, and the mix ratios are found to slightly influence the degradation profiles. MTT assay and histological observations are used to examine the mixed copolymer solution. Both in vitro and in vivo results illustrate acceptable biocompatibility of our mixed materials. Collectively, our results show that the mixed star-shaped PLGA-mPEG block copolymer is a promising candidate as a novel injectable gel.     

Platinum supported on reduced graphene oxide as a catalyst for hydrogenation of nitroarenes

Reduced graphene oxide (RGO)-supported platinum (Pt) catalyst was prepared by simple ethylene glycol (EG) reduction and used for hydrogenation of nitroarenes. Characterizations showed that EG as a reductant exhibited more advantages than the widely used hydrazine hydrate to fabricate monodispersed, small sized Pt nanoparticles on the surface of RGO. The yield of aniline over the Pt/RGO-_EG catalyst reached 70.2 mol-_AN/(mol-_Pt min) at 0 ^oC, which is 12.5 and 19.5 times higher than that of multi-walled carbon nanotube- and active carbon-supported Pt catalysts, respectively. When the reaction temperature was increased to 20 ^oC, the catalytic activity of Pt/RGO-_EG jumped to 1138.3 mol-_AN/(mol-_Pt min), and it was also extremely active for the hydrogenation of a series of nitroarenes. The unique catalytic activity of Pt/RGO-_EG is not only related to the well dispersed Pt clusters on the RGO sheets but also the well dispersion of Pt/RGO-_EG in the reaction mixture.     

多元醇还原法制备Co-Ni和Fe-Co-Ni磁粉

通过多元醇还原法可以制得尺寸范围从几微米到几十纳米的球形、单分散和Co-Ni系和Fe-Co-Ni系磁粉,并在2～18GHz频率范围内研究其微波磁特性。实验表明,此法制得的Co-Ni系和Fe-Co-Ni系磁粉的物理化学特性随着Co含量的不同而呈现出一定规律性变化。