环形支撑在不规则形状深基坑支护中的应用

结合工程实例,论述了环形支撵在不规则形状深基坑中的应用,并且采用环形支撑很好地控制了基坑变形,方便了土方开挖和基础施工.这对类似工程具有参考意义.     

脱硫型水煤浆燃烧脱硫的机理研究

脱硫型水煤浆燃烧具有较高的脱硫率，为深入研究其机理，采用Ｘ射线衍射仪等手段，结合水煤浆燃烧特点，分析了整个脱硫过程．特别对于水煤浆燃烧脱硫优越于煤粉的原因作了解释，提出脱硫型水煤浆具有较高脱硫率的机理在于：耐高温脱硫产物３ＣａＯ３Ａｌ２Ｏ３Ｃａ－ＳＯ４的形成、增湿活化作用以及较低的燃烧温度     

人工神经网络方法在优化动力配煤中的应用研究

对神经网络ＢＰ算法的一些改进作了大量的数值试验研究，并组合了部分改进方法用于动力配煤问题中状态预测过程的建模，最后把神经网络方法纳入到非线性混合离散变量优化设计方法（ＭＤＯＤ法）中，对杭州配煤场 动力配煤过程作了应用介绍。     

几种国产聚丙烯透明成核剂性能的研究

研究了采用国产三代山梨醇透明成核DMDBS制备的透明聚丙烯的光学性能、结晶性能、机械性能与热性能。研究表明,在0~2500ppm内随着添加量的增加,国产三代山梨醇透明成核剂与美利肯3988i具有相似的浊度变化曲线。在同样的添加量下,国产三代山梨醇透明成核剂具有与3988i相近的光学性能、结晶性能、机械性能与热变形温度,且无气味,可作为替代进口透明剂、降低生产成本的有效途径。     

一种基于P2P点组技术的流媒体协作计算

分析了流媒体技术的现状和问题,讨论了在P2P环境下的流媒体多点分布式调度技术和调度性能分析,以及多点调度下的带宽分配算法,最后给出了一个基于P2P点组的流媒体协作调度模型。     

Viscoelastic behaviors and drying kinetics of different aqueous gelcasting systems for large Nd: YAG laser ceramics rods

Large and nondeforming Nd: YAG ceramic prepared by wet forming is of great importance as gain medium to obtain high-power solid-state lasers. However, it is difficult to achieve high-quality laser ceramics due to insufficiency of the in-depth understanding of transformation mechanism of gels viscoelasticity and effective control means during drying process. In this work, the rheological behaviors, viscoelastic characteristics, and mechanical strengths in classical acrylamide (AM) and novel Isobam (PIBM) gelcastings were systematically compared to explore the suitable route for the large-sized 2% Nd: YAG transparent ceramics with high aspect ratio (>10). AM system exhibited a higher complex viscosity (1.82 × 10⁵ Pa s), a shorter gel time (92.9 seconds), and a higher flexural strength (about 24.46 MPa) than PIBM system, and especially its ability to quickly gel was beneficial to the homogeneity of green body. In addition, the order of drying rates of wet gels in four drying media was observed as follows: 55℃ hot air> ethanol> solid desiccant> PEG-11000 and the moisture diffusion coefficients were calculated and simulated to offer the deep consideration of drying kinetics. The “ethanol + 55℃ hot air” was regarded as an effective composite drying method to eliminate defect and to achieve φ8 mm × 160 mm Nd: YAG ceramic with the in-line transmittance of 83% @1064 nm. Therefore, not only the cognition of gel process, but also the defects control strategy is proposed. More importantly, this work greatly promotes the application of wet forming and laser ceramics in high-power lasers.     

A novel coumarin‐based fluorescent probe for selective detection of cysteine over homocysteine

A coumarin‐based fluorescent probe containing both acrylate moiety and an allyl substituent was developed for distinguishing cysteine from homocysteine. The maximum absorption wavelength of the probe showed a bathochromic shift upon addition of cysteine and the colour changed from colourless to yellow. The maximum fluorescence emission at 462 nm of the probe was dramatically enhanced upon addition of cysteine in aqueous solution. In HEPES buffer (pH = 7.4, EtOH/H₂O = 9:1, v/v), both of the fluorescence emission bands of the probe at ca. 390 and 462 nm were intensely enhanced upon the addition of cysteine, while other amino acids, namely, homocysteine, asparaginic acid, methionine, glycine, phenylalaninase, valine, tryptophan, serine, glutamic acid and glutathione, did not cause a remarkable change. The probe can be used for selectively colorimetric and ratiometric fluorescent detection of cysteine over homocysteine and other common amino acids in both organic media and aqueous solution. The concentration of cysteine can be estimated by titration of the probe in aqueous solution, and the detection limit of the probe towards cysteine was 2 μmol/L.     

加工助剂对炭黑填充丁腈橡胶性能的影响

在填充50份(质量,下同)高耐磨炭黑(HAF)且用过氧化物硫化的丁腈橡胶(NBR)中使用一种新型加工助剂M(一种具有特定相对分子质量的含醚键和羟基等多种官能团的氟硅化合物),测定了炭黑填充NBR胶料的门尼黏度、硫化特性和硫化胶的物理机械性能,用橡胶加工分析仪和扫描电子显微镜对其进行了分析,并与加入硅烷偶联剂Si69及常用的以脂肪酸酯和不饱和脂肪酸锌皂为主要成分的2种分散剂进行了比较。结果表明,使用上述加工助剂均有利于炭黑在NBR胶料中的分散,胶料的加工性能和硫化胶的物理机械性能均得到不同程度的改善;以脂肪酸酯和不饱和脂肪酸锌皂为主要成分的分散剂能延缓炭黑填充NBR胶料的过氧化物硫化和降低硫化胶的交联密度;随着Si69的用量在2.0～6.0份范围内增加,胶料的正硫化时间减小,硫化胶的交联密度和定伸应力增加,而硫化胶的撕裂强度、耐热空气老化性、耐热油性、耐压缩永久变形性能和溶胀指数有下降的趋势;在Si69用量2.0～6.0份内及用量相同时,与无加工助剂和使用其他加工助剂相比,加工助剂M对胶料的硫化无明显影响,能够改善其加工性能,硫化胶的综合性能较好,其中耐热和压缩永久变形性能的改善最为明显。     

模拟输液器的热解特性

建立非化学计量平衡模型,根据Gibbs最小自由能原理对医疗垃圾中的典型组分输液器进行平衡分析,根据分析结果拟合出产物分布的计算公式。通过危险废物热解焚烧多功能试验台进行试验,试验结果验证了计算公式的可靠性,从而通过公式可直接预测医疗垃圾中典型组分输液器热解后的各产物百分含量。     

刺梨白粉病拮抗菌的筛选及其抑菌机制初探

为筛选出对刺梨白粉病具有良好抑制作用的拮抗菌,从健康刺梨及其根系土壤进行微生物分离,以刺梨白粉病病原菌(Sphaerotheca pannosa)为靶标菌株,采用叶盘法对拮抗菌进行筛选,通过形态学、生理生化特征以及16S rRNA对筛选的拮抗菌进行鉴定,测定其OD值绘制生长曲线,并探究拮抗菌对病原菌孢子萌发和菌丝的影响及其产酶情况。结果表明:共分离得到48株细菌,其中JK-6和JK-32具有显著抑制作用,经鉴定为解淀粉芽孢杆菌(Bacillus amyloliquefaciens)和空气芽孢杆菌(Bacillus aerius),对刺梨白粉病的防治效果达到了60%和57%;拮抗菌作用下致使病原菌的孢子在萌发过程中发生异常膨大现象,菌丝表面变得粗糙、膨大、缠绕和融断;产酶情况表明两株拮抗菌均可产生蛋白酶、纤维素酶以及果胶酶。为刺梨白粉病的生物防治提供了理论基础,具有进一步研究价值。