摘要：With the continuous development of full tensor gradiometer （FTG） measurement techniques, three-dimensional （3D） inversion of FTG data is becoming increasingly used in oil and gas exploration. In the fast processing and interpretation of large-scale high-precision data, the use of the graphics processing unit process unit （GPU） and preconditioning methods are very important in the data inversion. In this paper, an improved preconditioned conjugate gradient algorithm is proposed by combining the symmetric successive over-relaxation （SSOR） technique and the incomplete Choleksy decomposition conjugate gradient algorithm （ICCG）. Since preparing the preconditioner requires extra time, a parallel implement based on GPU is proposed. The improved method is then applied in the inversion of noise- contaminated synthetic data to prove its adaptability in the inversion of 3D FTG data. Results show that the parallel SSOR-ICCG algorithm based on NVIDIA Tesla C2050 GPU achieves a speedup of approximately 25 times that of a serial program using a 2.0 GHz Central Processing Unit （CPU）. Real airbome gravity-gradiometry data from Vinton salt dome （south- west Louisiana, USA） are also considered. Good results are obtained, which verifies the efficiency and feasibility of the proposed parallel method in fast inversion of 3D FTG data.

摘要：采用将准三维设计和多级局部优化联合的多级涡轮多工况气动优化设计流程对某三级航空发动机涡轮进行多级气动优化设计.优化联合采用人工神经网络和遗传算法对各列叶栅进行三维局部优化,流场计算采用全三维粘性流N-S方程求解.通过优化设计,改善了各列的性能,并对各列间参数进行了优化匹配,两种工况的总效率均提高1%,总流量基本不变,总体性能提高,达到设计要求.

摘要：为改善水利蜗壳离心泵叶轮和导叶的多参数匹配特性,解决性能和几何参数间无精准数学模型的设计难题,提出基于改进粒子群算法的水利蜗壳离心泵水力部件匹配优化方法。首先,采用BladeGen软件对叶轮和导叶进行参数化建模,以三阶贝塞尔曲线分别拟合叶轮和导叶叶片安放角曲线,选取8个控制点(叶轮、导叶各4个)的y坐标值为决策变量,采用CFX软件对不同方案进行定常数值计算得到设计工况效率,并将其作为优化目标;其次,基于叶片泵性能自动优化平台,设定改进粒子群算法种群数和迭代数均为20,自动调动水利蜗壳泵数值计算程序,智能在全局范围内寻优。研究结果表明:在粒子群算法迭代到第13次时,泵效率达到最优,在设计工况下效率提高了3.09%,获得最优参数组合,优化后叶轮和导叶的包角均增大;优化模型内部熵产损失降低,叶轮叶片工作面、叶轮与导叶交界处能量损失明显减小,内部流动更符合叶片型线趋势,流动分离状况得到改善,验证了蜗壳泵智能优化设计方法的合理性。

摘要：为实现钢筋混凝土(RC)双层桥梁排架墩的地震损伤控制设计,提出将上层桥墩设计为装配式摇摆-自复位(RSC)结构,下层桥墩设计为装配式承插连接,但不发生摇摆反应的双层桥梁排架墩。给出新型排架墩中无黏结预应力筋、耗能角钢等的设计方法。以甘肃省洛塘河大桥非规则双层排架墩为原型,建立普通RC与新型RSC两种双层排架墩抗震数值分析模型,并结合太平洋地震工程研究中心(PEER)完成的RSC排架墩振动台试验结果验证建模方法的准确性。在此基础上,完成RC与RSC排架墩模型在40条近断层地震动下的动力时程分析,对比分析2种排架墩的抗震性能。研究结果表明:RSC排架墩上层桥墩最大层间位移角略大于普通RC排架墩的上层桥墩最大层间位移角,但RSC排架墩下层桥墩最大层间位移角仅为普通RC排架墩下层桥墩最大层间位移角的47%;RSC排架墩上、下层桥墩层间残余位移角仅为普通RC排架墩上、下层桥墩层间残余位移角的2%左右;RSC排架墩可显著降低下层桥墩的地震剪力需求,无黏结预应力筋应力保持弹性,耗能角钢易屈服耗能但未拉断,验证了所建议的双层桥梁排架墩地震损伤控制设计方法的合理性。

摘要：Layered inorganic materials provide an essential platform for constructing new structural configurations of materials with exceptional ***,precise control over the interlayer molecular arrangement remains a significant challenge,impeding in-depth exploration in physics and chemistry ***,we demonstrated a new layered organic-inorganic superlattice composed of a S-Ta-S inorganic lattice and bilayer linear molecules,providing superhigh heat insulation.A series of interlayer-confined intercalations of alkylamines with increasing chain length in the layered inorganic materials were achieved through precisely ordered molecule design(TaS_(2)-Cn,n=3,6,8,12).Systematic spectral analysis reveals that as the length of the intercalated alkyl chain increases,the alkyl chain between layers becomes more ordered and linear,and the gauche conformation ***,the more linear and ordered alkyl chain conformation results in lower thermal *** thermal conductivity of TaS_(2)-C12 is 0.426 W m^(−1) K^(−1),which is only one-third that of the pristine TaS_(2) *** anticipate that this layered organic-inorganic superlattice design will pave a new avenue for developing new organic-inorganic functional materials and probing the limits of ultralow thermal conductivity materials.

摘要：充分了解和掌握Super混合料与AC混合料在材料选择及其设计理念上的差异,以期正确地认识和使用Super混合料。通过室内试验,结合沥青路面工程实践,比较和分析了Super混合料与AC混合料在材料组成、配合比设计方法等方面的主要差异。结果表明:在材料选择方面的主要不同为沥青选择方法、混合料级配组成要求的不同,Super混合料选择沥青时考虑了环境温度和道路荷载情况,S形的Super混合料级配曲线实际上与我国现行规范中的粗级配的AC-C型混合料接近;在配合比设计上的差异主要表现为试件的成型方法不同、试件的体积参数指标要求的不同,这些差异使得这两种混合料具有完全不同的路用性能和施工特性。若采用马歇尔方法设计Super混合料(或粗级配混合料)时,沥青路面可能存在着出现车辙和水损害的隐患。

摘要：为了简化机械式玉米排种器结构,提高作业质量,设计了一种夹持式玉米精密排种器,通过压种环在各工作区域的不同结构配合夹种块控制种子的位置及运动状态,实现排种作业。结合玉米种子几何尺寸,对充种过程进行理论分析,获得种子填充力的变化规律,阐述了清种、投种工作原理,设计了夹种块、压种环等关键部件。为检验排种器的排种性能,选用天农九(大粒)、红旗688(中粒)、黄金糯(小粒)3种不同几何尺寸的玉米种子为试验对象,以播种机工作速度为试验因素,以合格指数、重播指数、漏播指数为试验指标,进行单因素试验。试验表明,天农九排种效果较佳,在工作速度为11km/h时,其合格指数为90.1%,重播指数为9.1%,漏播指数为0.8%,满足排种作业要求。

摘要：提出了一种实时模糊控制算法,并对一类运动控制系统的实现方式进行了分析,设计了基于CAN总线的模糊运动控制系统,给出了系统的整体结构和现场控制单元的设计方案。实验结果表明,该控制系统具有实时性强、响应速度快、精确度高的特点。

摘要：为实现摇摆-自复位(Rocking Self-Centering,RSC)双层桥梁排架墩的地震损伤控制设计和震后功能快速恢复,结合外置角钢、耗能钢筋、无黏结预应力筋设计了仅上层摇摆(模型1)、仅下层摇摆(模型2)以及双层均摇摆(模型3)的3种RSC双层排架墩。同时设计了一个普通钢筋混凝土(Reinforced Concrete,RC)双层排架墩(模型4)作为参考。建立了不同排架墩的抗震数值分析模型,并结合1个RSC单层排架墩的拟静力试验结果验证了建模方法的准确性。定义了RSC双层排架墩在强震下的失效准则,分析了近断层地震动下各双层排架墩的地震反应。结果表明:与普通RC双层排架墩相比,各RSC双层排架墩基本自振周期显著增大。PGA为0.1g时,RSC双层排架墩的角钢屈服并耗能。PGA为0.4g时,普通RC双层排架墩的层间残余位移角为0.82%,RSC双层排架墩的层间残余位移角接近0,且各RSC双层排架墩中预应力筋均未屈服;除模型1中的外置角钢未被拉断破坏外,其余模型中的角钢均被拉断。模型4下层桥墩截面的曲率延性系数远大于模型1下层(非摇摆层)桥墩以及模型2上层(非摇摆层)桥墩截面的曲率延性系数值。

摘要：We describe the footprint and input catalog for bright nights in the LAMOST Pilot Survey, which began in October 2011. Targets are selected from two stripes in the north and south Galactic Cap regions, centered at δ = 29°, with 10° width in declination, covering right ascensions of 135° to 290° and -30° to 30° re- spectively. We selected spectroscopic targets from a combination of the SDSS and 2MASS point source catalogs. The catalog of stars defining the field centers （as re- quired by the Shack-Hartmann wavefront sensor at the center of the LAMOST field） consists of all V 〈 8m stars from the Hipparcos catalog. We employ a statistical selection algorithm that assigns priorities to targets based on their positions in mul- tidimensional color/magnitude space. This scheme overemphasizes rare objects and de-emphasizes more populated regions of magnitude and color phase space, while en- suring a smooth, well-understood selection function. A demonstration of plate design is presented based on the Shack-Hartmann star catalog and an input catalog that was generated by our target selection routines.