基于Fluent的水击泄压阀阻力系数研究

针对长输油管道广泛应用的水击泄压阀,应用CFD方法对其内部流场进行了分析计算。按照实际泄压阀的结构,建立了简化后的二维流场几何模型,根据模拟的流场压力分布计算不同开度、不同开启压力和不同管径下泄压阀的阻力系数,指出泄压阀的阻力系数与开度、管径有关,开启压力对泄压阀的阻力系数几乎没有影响。     

积极准备小型燃气热电联产系统应用

小型燃气热电联产具有发电效率高、能源能充分利用、良好的环保、投资成本低、建设时间短及运行简单等优点,可作为今后发展热电联产的首选。根据用户对热力产品的需求不同,联产系统可以有不同的组合形式。但在推广燃气热电联产时必须要有必要的技术准备以及相应的政策。     

塔河油田跃参1号区块油气富集规律

利用地质、物探、钻井、录井、测井、测试、地化分析及生产数据等资料,对塔河油田跃参1号区块油气富集规律进行了综合研究。研究表明:跃参1号区块奥陶系油气富集程度受T74不整合面、断裂、储层、构造等因素综合影响;T74不整合面是古岩溶发育的前提,也是油气横向调整和侧向运移的主要通道,是油气富集的主控因素;断裂控储、控藏特征明显,主干断带是油气纵向运移的主要通道,控制原油密度分布,油气富集程度高;远离主干断裂带的次级断裂油气富集较差,连通主干断裂带的次级断裂油气富集较好;T74古构造高部位的断裂带是油气运移的主要指向,油气富集程度高,是勘探有利区。     

Old-age Care Modes and Facility Planning Based on the Concept of “Continuum of Care”

Through the comparative analysis on the theories and practical experience of the development of old-age care (OAC) in both China and other countries,and based on the interview and questionnaire survey in Zhejiang Province and Hangzhou City,this paper proposes the research and analysis framework for the old-age service system,i.e.,"OAC mode-OAC service system-OAC facility system." The paper argues that,oriented by OAC mode of "taking community-and home-based care as the main body and institution-based care as supplement," China should build an OAC facility system and planning thoughts that take "continuum of care" as concept and long-term care system as core.Taking Zhejiang Province and Hangzhou City as examples,the paper conducts the optimization research on current OAC facilities planning in terms of hierarchical system,scale,and differentiation,so as to formulate more systematic and operable planning standards for OAC facilities.     

Effect of surface passivation on optical and electronic properties of ultrathin silicon nanosheets

The binding energy,electronic structure and optical properties of H-,H 3 C-,and HS-cluster-passivated ultrathin silicon (single-layer and double-layer) nanosheets were calculated using density functional theory based on the plane-wave ultra-soft pseudopotential.Firstly,the most stable configuration was selected from passivated configurations according to the principle of lowest energy after calculating their total energies.Then the density of state and the band structure of the different passivated systems were calculated.It was found that different passivation clusters could affect the forbidden band,theremore the passivated cluster with sulfur could greatly decrease the width of the forbidden band through electron transfer.Lastly,the light absorption and reflection properties were also investigated.All results were conducive to the development of silicon-based optoelectronic devices.     

中厚板边部横裂纹产生机理研究

边部横裂是中厚板裂纹缺陷之一,其形成机理较为复杂。通过大量生产数据采集,把理论研究与当前热轧工艺特点、设备状况、操作模式等相结合,分析产生板材边部横裂纹的具体原因,并最终形成综合性的解决方案,取得了较好的效果。     

拉曼-纳斯衍射声光Q开关的实验研究

实验研究了拉曼-纳斯(R-N)衍射的声光相瓦作用长度与声波光波参数之间的关系,确定了最佳声光相互作用长度.在此基础上,分别设计以水和TeO2晶体为声光介质的R-N衍射Q开关器件,测量了器件的衍射效率、衍射角和插入损耗等参数.应用TeO2晶体开关器件调制长脉冲Nd:YAG/KTP激光器,当重复频率为10 kHz时得到了脉...     

指数掺杂透射式GaAs光电阴极表面光电压谱研究

通过求解一维稳态少数载流子扩散方程,推导了指数掺杂和均匀掺杂的透射式GaAs光电阴极表面光电压谱理论方程。利用金属有机化学气相沉积(MOCVD)外延生长了发射层厚度相同、掺杂结构不同的两款透射式阴极材料。通过表面光电压谱实验测试和理论拟合发现指数掺杂结构在发射层厚度和后界面复合速率相同的情况下能够有效提高阴极电子扩散长度,这主要由于内建电场能够促使光生电子通过扩散和电场漂移两种方式向表面运动,从而最终提升阴极的发射效率和表面光电压谱。利用能带计算公式和电子散射理论对这两种不同结构材料的表面光电压谱进行了详细分析。     

波长间隔可调谐多波长光纤光学参量振荡器

提出并实现了一种以高非线性色散位移光纤为增益介质,以光栅对形成谐振腔,简单线形结构的连续光抽运的波长间隔可调谐多波长光纤光学参量振荡器(MW-FOPO)。采用波长可调谐的窄线宽激光器作为抽运种子光源,以伪随机相位调制抽运光来抑制高非线性光纤中的受激布里渊(SBS)散射效应,结合高功率掺铒光纤放大器构成光纤光学参量振荡器的大功率抽运,通过四波混频(FWM)效应获得了室温下稳定的多波长激光输出。MW-FOPO的波长间隔可以通过调节抽运波长进行调谐。在1505~1615 nm光谱范围内,获得了17条消光比大于10 dB的多波长谱线。实验证明了MW-FOPO实现多波长激光光源的优异特性。     

复杂小断层精细解释方法在洋心次凹的应用

洋心次凹是苏北盆地白驹凹陷内一个小型次级箕状凹陷,具有断裂系统复杂、断层密度高、圈闭面积小等特征。前期勘探成果表明洋心次凹具有良好的油气勘探前景,但其构造落实程度较低。为此本文从该区断裂系统入手,利用多种属性提取、多种剖面显示、多个方向剖面解释和加大剖面解释密度的"三多一密"解释方法进行小断层的识别与描述,提高了构造落实精度,取得了较好的应用效果。