采场安全监测与冒顶预报

本文总结了声发射现场监测预报的试验结果，提出了采场稳定性预测的综合方法，应用灰色理论预测和神经网络方法较好地解决了采场冒顶预报问题。     

高压喷射注浆技术在灰岩地区的应用

介绍了高压喷射注浆技术的应用历史、工作机理及其在灰岩地区的应用实例.     

无梁楼盖结构设计方法的探讨

结合工程实际，介绍了无梁楼盖的几种不同的计算方法，并对其计算结果进行了比较，从而得出最符合实际受力情况的计算方法。     

湿度应力场的数值模拟

基于新的湿度应力场理论,建立了湿度应力场的数值模拟方法,并用通用有限元分析软件ANSYS中的温度应力场模块,有效地模拟了圆形硐室遇水作用的湿度应力场问题.数值模拟的结果与解析解结果的一致性表明,所建立的数值模拟方法是有效的.     

鞍形索网玻璃采光屋面的应用与设计

结合一项实验工程对鞍形索网结构在玻璃采光屋面中的应用及其受力特性进行研究 ,同时对施工过程进行模拟分析。为鞍形索网体系在玻璃采光屋面中的应用和设计提供了建议。     

气流扰动下单液滴撞击单根干燥扁网丝特性数值研究

丝网分离器在工业中有着广泛地应用。本文针对液滴撞击网丝的动态过程,采用CLSVOF方法对单个液滴撞击干燥网丝的问题进行数值模拟,经过合理的简化,建立了气流扰动下单液滴撞击干燥扁网丝面的二维数学模型,分析了液滴撞击角和撞击位置对液滴撞击行为特性的影响。数值计算的结果表明:液滴撞击到干燥网丝上分为铺展和飞溅2个过程,撞击角越小,上铺展半径越大,下铺展半径越小,分离的二次液滴体积越大;液滴撞击网丝的位置离网丝边缘越近,越容易产生二次液滴,二次液滴的总体积越多。     

水力压裂过程的扩展有限元数值模拟方法

建立了基于扩展有限元法的水力压裂数值模拟方法,使水力裂缝独立于网格存在,无需预设裂缝扩展方位。在扩展有限元计算框架下,将裂缝面处理为求解域内边界,将缝内水压力转化为相关单元等效节点力;运用考虑缝内水压力作用的相互积分法来数值求解缝尖应力强度因子;采用最大能量释放率准则确定裂缝是否继续扩展及扩展方位;最终编制了计算机程序。利用该方法数值模拟了单条水力裂缝在恒定水压力作用下作非平面扩展,所得结果分别与室内试验和解析模型相对比。结果表明,数值结果与室内试验和解析解吻合较好,缝尖应力强度因子最大相对误差不高于0.45%,验证了该方法的可行性和准确性。     

Extraction,Characterization, and Platelet Inhibitory Effects of Two Polysaccharides from the Cs-4 Fungus

Cardiovascular diseases are associated with platelet hyperactivity, and downregulating platelet activation is one of the promising antithrombotic strategies. This study newly extracted two polysaccharides (purified exopolysaccharides, EPSp and purified intercellular exopolysaccharides, IPSp) from Cordyceps sinensis Cs-4 mycelial fermentation powder, and investigated the effects of the two polysaccharides and their gut bacterial metabolites on platelet functions and thrombus formation. EPSp and IPSp are majorly composed of galactose, mannose, glucose, and arabinose. Both EPSp and IPSp mainly contain 4-Galp and 4-Glcp glycosidic linkages. EPSp and IPSp significantly inhibited human platelet activation and aggregation with a dose-dependent manner, and attenuated thrombus formation in mice without increasing bleeding risk. Furthermore, the EPSp and IPSp after fecal fermentation showed enhanced platelet inhibitory effects. The results have demonstrated the potential value of Cs-4 polysaccharides as novel protective ingredients for cardiovascular diseases.     

The Relationships among “STAY-GREEN” Trait,Post-Anthesis Assimilate Remobilization,and Grain Yield in Rice (Oryza sativa L.)

The mobilization and translocation of carbohydrates and mineral nutrients from vegetative plant parts to grains are pivotal for grain filling, often involving a whole plant senescence process. Loss of greenness is a hallmark of leaf senescence. However, the relationship between crop yield and senescence has been controversial for many years. Here, in this study, the overexpression and RNA interference lines of gene of OsNYC3 (Non-Yellow Coloring 3), a chlorophyll catabolism gene, were investigated. Furthermore, exogenous phytohormones were applied, and a treatment of alternate wetting and moderate drying (AWMD) was introduced to regulate the processes of leaf senescence. The results indicated that the delayed senescence of the “STAY-GREEN” trait of rice is undesirable for the process of grain filling, and it would cause a lower ratio of grain filling and lower grain weight of inferior grains, because of unused assimilates in the stems and leaves. Through the overexpression of OsNYC3, application of exogenous chemicals of abscisic acid (ABA), and water management of AWMD, leaf photosynthesis was less influenced, a high ratio of carbohydrate assimilates was partitioned to grains other than leaves and stems as labeled by ¹³C, grain filling was improved, especially for inferior spikelets, and activities of starch-synthesizing enzymes were enhanced. However, application of ethephon not only accelerated leaf senescence, but also caused seed abortion and grain weight reduction. Thus, plant senescence needs to be finely adjusted in order to make a contribution to crop productivity.     

Effects of Alhagi Honey Polysaccharides as Feed Supplement on Intestine Function and Microbiome,Immune Function,and Growth Performance in Chicken

Hy-Line Brown chickens’ health is closely related to poultry productivity and it is mainly maintained by the immune system, healthy intestinal function, and microflora of chicken. Polysaccharides are biological macromolecules with a variety of activities that can be used as a potential prebiotic to improve poultry health. In this experiment, the function of Alhagi honey polysaccharides (AH) as an immunomodulator on the chicken was investigated. All chicken (120) were randomly distributed to four groups (five replicas/group, six hens/replica). A total of 0.5 mL water was taken orally by the chicken in control group. AH (0.5 mL) in different concentrations (three dosages, 0.3 g/kg, 0.6 g/k, and 1.2 g/kg) were used for the AH-0.3 g/kg, AH-0.6 g/k, and AH-1.2 g/kg group, respectively. The results showed that the growth performance of the chickens and the index of immune organs (the weight of immune organs/the body weight) were enhanced significantly after being AH-treated (p < 0.05). The content of sIgA and cytokines was upregulated remarkably in the intestine after being AH-treated (p < 0.05). The AH treatment significantly enhanced the intestinal epithelial barrier (p < 0.05). Moreover, the percentage of CD4⁺ and CD8⁺ T cells in the ileum, spleen, and serum were obviously upscaled (p < 0.05). In addition, the AH treatment significantly enhanced the production of short chain fatty acids (SCFAs) and improved the structure of gut microbiota (p < 0.05). In conclusion, we found that AH-1.2g/kg was the best dosage to improve the chicken’s health, and these data demonstrated that AH could be used as a potential tool to enhance growth performance through improving intestine function, immunity, and gut microbiome in chicken.