摘要：为研究大功率汽轮机在小负荷状态下末级长叶片区域的鼓风热现象,首先汇总分析了各类相关文献关于旋转叶片类结构搅拌鼓风热现象相关的定量计算公式,然后以国内某大功率600MW超临界发电汽轮机为研究对象,建立了末三级动、静叶片的流场数值模型,依据热力设计数据对其末三级多工况流场进行了数值模拟,获得了其流场分布数据。在数值分析数据的基础上探讨了负荷水平、工质密度和动力黏度等因素与鼓风热损失之间的相关性,分析表明负荷水平与鼓风热损失之间相关性更为明显,其原因主要在于长叶片级组内小负荷状态下流场存在复杂的三维特性;对文献经验公式,在汽轮机末级长叶片鼓风热损失的试算表明,其并不适用于长叶片级组内小负荷状态;最后用线性回归方法建立了鼓风热损失与负荷水平及级最高温度与负荷水平之间的经验性估算公式。本文研究方法及数据可为评估类似结构和功率等级汽轮机鼓风热损失提供参考,为机组安全运行指导提供支持。

摘要：以小米、糯米和桂花为主要原料制备桂花风味复合甜酒酿。以感官评分为指标,固定发酵温度为35℃,以小米和糯米总质量为基准,通过单因素试验探究小米与糯米的质量比、桂花添加量、酒曲添加量、发酵时间对桂花风味小米复合甜酒酿感官评分的影响,并结合响应面法优化发酵工艺。结果表明,最佳发酵工艺条件为小米与糯米的质量比1∶4.7、桂花添加量1.6%、酒曲添加量0.5%、发酵时间50 h。在此条件下制备的甜酒酿滋味柔和、甜糯爽口,具有桂花清香,产品的酒精度为2.3%,还原糖含量为21.86 g/100 g,总酸含量为0.34 g/100 g,蛋白质含量为6.2 g/100 g,感官评分为91.5分。

摘要：The Aurora proteins are critical regulators of major mitotic events and attractive targets for anticancer therapy. 3D-QSAR studies based on molecular docking were performed on a dataset of 40 4-aminoquinazolines compounds. The CoMSIA model produced significantly better results than CoMFA model, with q2=0.652 and r2=0.991. The contours analysis provides useful information about the structural requirements for 4-aminoquinazolines for inhib- iting Aurora B. Scaffold hopping method was used to generate new structures based on the maximum common sub- structure of the training and test set compounds. The ADMET property, binding affinity and inhibitory activity of the new designed compounds were predicted, respectively. Finally 16 compounds were identified as the novel in- hibitors for Aurora B kinase.

摘要：超高层建筑大悬挑平台钢结构的施工作业技术难度高、安全风险大。基于腾讯广州总部大楼项目,通过地面拼装、分段起吊的方式,在大楼38层屋面依次安装屋面桁架和悬挑区域钢梁,并基于动臂塔式起重机的吊运能力设计了钢结构分段安装的顺序,提高了施工的效率,保证了施工过程的安全。

摘要：中南剧场是为"全国第八届艺术节"服务的重点项目,内设一个以自然声演出为主的专业话剧院.为确保中南剧场具有良好的音质,特别是在自然声演出的情况下,能够确保最后排观众具有足够的声压级,笔者做了大量分析、计算,包括用计算机软件(EASE 4.0)进行模拟分析.文中主要介绍了为达到自然声演出的要求,对中南剧场所做的音质参量设计、体型设计、声学处理以及计算机软件模拟分析.

摘要：The influence of brazing temperature and brazing time on the microstructure and shear strength ofγ-TiAl/GH536 joints brazed with Ti-Zr-Cu-Ni-Fe-Co-Mo filler was investigated using SEM,EDS,XRD and universal testing *** show that all the brazed joints mainly consist of four reaction layers regardless of the brazing temperature and brazing *** thickness of the brazed seam and the average shear strength of the joint increase firstly and then decrease with brazing temperature in the range of 1090-1170℃and brazing time varying from 0 to 20 *** maximum shear strength of 262 MPa is obtained at 1150℃for 10 *** brittle Al3NiTi2 and TiNi3 intermetallics are the main controlling factors for the crack generation and deterioration of joint *** fracture surface is characterized as typical cleavage fracture and it mainly consists of massive brittle Al3NiTi2 intermetallics.

摘要：随着在线广告在产业界取得巨大成功,其在学术界特别是数据挖掘和机器学习领域的研究也吸引了大量学者的关注.本论文围绕实时竞价机制在展示广告投放中的关键问题展开研究.首先介绍了实时竞价的基本流程、主要参与者的功能、定价模型和交易机制;然后分别从需求方、供应方和交易中心的角度,介绍了实时竞价中存在的关键问题,以及目前的研究方法、理论和模型,具体包括:用户响应预测、出价策略、预算与步进管理、保留价优化、库存分配、拍卖机制等,特别针对用户响应预测和出价策略两个研究热点展开了广泛讨论,并对其中的代表性方法进行了量化对比;此基础上对主要的广告欺诈方式和检测手段进行了整理;最后对该方向未来的研究趋势进行展望.

摘要：为探究硅锌配施对寒地水稻产量、品质及抗倒性的影响,明确高产优质的硅锌优化管理措施,采用二因素完全随机设计,进行3个硅肥水平下3个锌水平的试验研究。结果表明:A2处理水稻秧苗株高、根长差分别较对照显著提高8.0%、16.0%;A2处理地上部分与地下部分鲜重干重较对照分别提高4.8%、23.4%、0.3%、5.7%,差异达到显著或极显著水平;施硅能够提高各节间茎秆抗折力,A2处理抗倒伏指数与A1处理相比提高了15.5%。A2处理穗数、穗粒数、结实率、产量较A1处理分别提高5.3%、5.0%、6.4%、18.5%,随施锌增加穗数、产量呈增加趋势,但硅锌互作对产量及其构成因素不显著。B2、B3各节间抗折力随锌肥的施用增加而呈增加的趋势,抗倒伏指数随锌肥的施用呈增加趋势,但各处理间差异不显著。硅肥和锌肥最优指标施用量的组合为最优配比。

摘要：为了澄清海德格尔(Heidegger)的本体论美学和传统的认识论美学之间的根本区别,采用了文献解析和价值观比较的方法,通过对艺术作品本源的追问,使其艺术思想的美学价值得以展现。研究认为:其本体论美学是和真理相关联的,艺术作品的存在方式揭示了艺术的本性,即艺术就是真理的生成。这成就了海德格尔在西方美学史上的转折意义。

摘要：High-static-low-dynamic stiffness (HSLDS) vibration isolators have been demonstrated to be an effective means of attenuating low-frequency vibrations, and may be utilized for ship shafting applications to mitigate torsional vibration. This paper presents the construction of a highly compact HSLDS torsional vibration isolator by connecting positive and negative stiffness components in paral lel. Based on mechanical model analysis, the restoring torque of negative stiffness components is de rived from their springs and connecting rods, while that of positive stiffness components is obtained through their circular section flexible rods. The quasizero stiffness characteristics of the HSLDS iso lator are achieved through a combination of static structural simulation and experimental test. The tor sional vibration isolation performance is assessed by means of numerical simulation and theory analy sis. Finally, the frequency-sweep vibration test is conducted. The test results indicate that the HSLDS torsional vibration isolator exhibits superior low-frequency isolation performance compared to its linear counterpart, rendering it a promising solution for mitigating low-frequency torsional vi bration in ship shafting.