多支点锚桩支护结构计算方法及锚点位置优化的探讨

多支点锚桩支护结构设计方法较多,论文探讨采用等值梁法对支护结构进行内力、弯距、插入深度的计算,用弹性地基法对变形与位移进行计算;探讨多锚点位置的优化,提出一种综合考虑内力、弯距和嵌入深度三种指标对锚点位置优化的新思路。     

糖化酶的研究概况

糖化酶是世界上生产量最大应用范围最广的酶类，介绍了糖化酶的结构组成、特性、生产、提取、活力检测以及提高酶活力的研究。     

非酸催化合成增塑剂邻苯二甲酸双十六烷基酯

以苯酐与十六醇为原料,选用非酸催化剂,在实验室合成了增塑剂邻苯二甲酸双十六烷基酯。考察了反应温度、反应时间和催化剂及物料配比对产率的影响。试验结果表明:反应温度控制在220℃、十六醇和苯酐的摩尔比为3.0、总物料中催化剂的质量分数w=0.2%、反应时间为4.5h时、催化剂的加入温度在180℃以上,产率达到98%以上。合成工艺过程中无三废产生,反应产物提纯后,经过红外光谱分析,确定产物为邻苯二甲酸双十六烷基酯。     

Tissue distribution and elimination of sesaminol triglucoside and its metabolites in rat

Sesame exhibits many beneficial physiological effects, which are mostly related to its lignan compounds, such as sesaminol glucosides. This investigation studies the distribution and elimination of sesaminol triglucoside from sesame in Sprague Dawley (SD) rats. In order to investigate the distribution of sesaminol triglucoside (p.o. 500 mg/kg) in SD rats, the changes in concentration of sesaminol triglucoside and its metabolites were determined in tissues and plasma within 24 h period after tube‐feeding to SD rats. Results showed that sesaminol triglucoside may be deglycosylated to form sesaminol first by intestinal microflora and then incorporated via lymphatic absorption into the cardiovascular system, transported to other tissues. The concentrations of sesaminol triglucoside and its metabolites in rectum, caecum, colon, and small intestines are higher than those in liver, lung, kidney, and heart. Its concentration in brain is low but detectable. Glucuronidation and sulfation was the main metabolic pathway for sesaminol in urine, and fecal elimination was a major route of elimination. From LC/MS/MS analysis of rat organs, sesaminol triglucoside can be converted to mammalian lignans, enterodiol (END), and enterolactone (ENL), by rat intestinal microflora. In the plasma, concentrations of END and ENL were 5.9 ± 0.2 and 5.5 ± 0.2 μmol/mL, respectively.     

Breaking the spores of the fungus Ganoderma lucidum by supercritical CO2

The hard sporoderm of Ganoderma lucidum spores prevents the release of bioactive components such as polysaccharides which have significant anti-tumour activity. In the present study, supercritical carbon dioxide (SC–CO₂) was used for the sporoderm breaking of G. lucidum spores, and polysaccharides were subsequently extracted and determined for evaluating the performances of SC–CO₂. The operating parameters were optimized by orthogonal array design (OAD), and the morphological status of sporoderm was observed by scanning electron microscope (SEM). The optimum operating conditions for SC–CO₂ breaking of sporoderm were as follows: pressure 35 MPa, temperature 25 °C, time 4 h, and CO₂ flow rate 10 kg/h. After SC–CO₂ processing, the extraction yield of polysaccharides reached 2.98%, which was 3-fold to that of the intact ones (0.94%). This method is fast, efficient and advanced enough to break the hard sporoderm of G. lucidum, which may provide a scientific reference for the large-scale processing of spores in the pharmaceutical and food industries.     

优良己酸菌分离培养及冷干保藏条件研究

以大曲酒窖窖泥为材料,对己酸菌进行了分离纯化,并对己酸菌菌种的真空冷冻干燥保藏方法进行了研究,初步确定了菌种冻干保藏的预冻温度及保护剂浓度。比较了己酸菌不同保存方式的保藏效果,实验表明采用冷冻干燥保藏法长期保藏菌种效果良好。     

用高压拉曼光谱方法研究β-胡萝卜素相变

为了探究β-胡萝卜素在高压下是否会发生相变,进行了0～30 Gpa压强范围内β-胡萝卜素的高压拉曼光谱实验。通过评估不同压强范围内拉曼光谱频移-压强的线性函数变化来判断β-胡萝卜素是否发生相变。研究表明,当压强升至约为7 Gpa以及14 Gpa时,β-胡萝卜素分子的频移-压强线性函数方程发生了变化,即发生了相变。通过分析频移-压强函数线性关系是否发生变化来判断相变,是简捷、方便的技术方法。关于纯β-胡萝卜素压力相变的研究,暂未检索到相关报道。     

光伏电站复合储能电压波动抑制双层优化控制方法

大规模光伏电站的不断接入为电力系统的安全稳定运行带来了巨大挑战。为解决光伏电站出力不确定性所造成的功率波动问题,提高光伏电站在并网点处电压的稳定性,文章采用由蓄电池与超级电容组成的复合储能一体化控制方法,提高光伏并网点电压稳定水平。首先研究由光伏电源、复合储能构成的典型复合储能系统拓扑结构下储能双层优化控制策略;其次,在不同储能介质的荷电状态与充放电特性模型基础上,研究基于不同光伏并网点电压波动场景的多储能介质组合电压波动抑制优化控制模型及其求解算法;最后,以并网光伏电站数据为基础,建立光伏复合储能电压波动优化控制仿真模型。仿真结果及其分析表明,文章所提出的基于复合储能的并网点电压波动抑制模型能够有效提升并网点电压稳定性能。     

邻近高耸建筑对小区风环境的影响试验研究

风环境是评价人居生活质量好坏的重要指标,随着国民经济的快速发展,越来越多的高耸楼宇应运而生,这些楼宇会较大程度地改变已有小区的风环境,给小区居民正常生活带来困扰,而当前对该问题的针对性研究还十分匮乏。以长沙通用时代国际社区为研究背景,利用大尺度风洞（10 m×3 m×21 m）对新增高耸建筑后的小区风环境进行了全方位、多工况试验研究,并基于超越概率法对有无新增高耸建筑小区风环境舒适度与危险度进行定量评估。结果表明：城市小区平均风剖面与湍流度剖面指数值要远高于规范值,表明城市小区具有较大的地表粗糙度。新增高耸建筑会显著改变其邻近区域风环境,如高耸建筑对通用时代小区100、200、300 m范围内平均风速分别造成了25%、6%和2%的加速作用,在增加高耸建筑后小区风环境舒适度与危险度超越概率最大值分别增加了2倍和6倍。     

基于数据仓库的销售数据可视化分析系统

为了辅助销售管理者充分利用已有的历史销售数据,快速直观地捕获敏感数据,及时准确地把握市场行情,研究了以数据仓库为分析平台,根据销售数据具有的地理特征,结合Google提供的Google Maps API（Application Program Interface）,将OLAP（Online Analytical Processing）的分析操作映射到地图具有的交互操作上的可视化分析系统。并基于实际案例着重设计并优化了数据仓库架构,为系统应用开发奠定了良好的基础。实践证明,系统有效提高了销售管理部门的统筹决策的效率及能力,为企业创造了更大的经济效益。