Research of 1 770 MPa galvanized steel wire for stay cable of domestic bridges

This paper focuses on introducing the manufacture technology of 1 770 MPa galvanized steel wires for stay cables applied to domestic bridges. During the development practices of high strength galvanized wire for stay cables used in Sutong Bridge, Baosteel has established three key technologies based on research of manufacture technology and technical innovation. The three key technologies are： ＂Double Tensioning ＋ limiter die＂ process, ＂dominant process ＋ fine adjustment＂ in integrated optimization technology and ＂three-level control＂ in hot dip galvanization. With these key technologies, Baosteel has produced 1 770 MPa galvanized wires for stay cable, which has high tensile strength, low relaxation and good torsion performances.     

草街冲砂闸闸墩C25混凝土施工温度观测反分析

基于闸墩C25混凝土现场原型试验,采用混凝土非稳定温度场求解的有限元仿真计算技术,集成了混凝土内部冷却水管的离散模型和迭代算法,根据现场温度实测资料,结合优化遗传算法对闸墩试验段混凝土温度场进行了反演分析.研究表明,反演所获取混凝土特性参数能较好体现工程实际情况,为温控仿真计算和确定温控防裂措施提供了重要保证.     

Novel method of ordinal bearing estimation for more sources based on oblique projector

A novel direction of arrival (DOA) estimation method is proposed when uncorrelated, correlated, and coherent sources coexist under color noise field. The uncorrelated and correlated sources are firstly estimated using the conventional spatial spectrum estimation method, then the noise and uncorrelated sources in Toeplitz structure are eliminated using differencing, finally by exploiting the property of oblique projection, the contributions of correlated sources are then eliminated from the covariance matrix and only the coherent sources remain. So the coherent sources can be estimated by the technique of modified spatial smoothing. The number of sources resolved by this approach can exceed the number of array elements without repeatedly estimating correlated sources. Simulation results demonstrate the effectiveness and efficiency of our proposed method.     

大学生心理健康与主观幸福感相关研究

目的：研究大学生心理健康与主观幸福感指标的相关。方法：采用《精神症状自评量表》（SCL-90）和《综合幸福感问卷》（MHQ）测量了107名大学生。结果：（1）幸福指数及各维度与SCL-90总均分及各维度存在显著负相关;（2）逐步回归分析显示,抑郁、恐怖和强迫可解释幸福指数的20%变异,强迫因子解释生活满意的22%变异,抑郁分别解释正性情感12%变异,负性情感11%变异。结论：心理健康指标评估应包括正负两个指标系统,抑郁是影响大学生主观幸福感的核心因素。     

Ultra-high cycle fatigue behavior of high strength steel with carbide-free bainite/martensite complex microstructure

The ultra-high cycle fatigue behavior of a novel high strength steel with carbide-free bainite/martensite (CFB/M) complex microstructure was studied. The ultra-high cycle fatigue properties were measured by ultrasonic fatigue testing equipment at a frequency of 20 kHz. It is found that there is no horizontal part in the S-N curve and fatigue fracture occurs when the life of specimens exceeds 107 cycles. In addition, the origination of fatigue cracks tends to transfer from the surface to interior of specimens as the fatigue cycle exceeds 107, and the fatigue crack originations of many specimens are not induced by inclusions, but by some kind of "soft structure". It is shown that the studied high strength steel performs good ultra-high cycle fatigue properties. The ultra-high fatigue mechanism was discussed and it is suggested that specific CFB/M complex microstructure of the studied steel contributes to its superior properties.     

住宅建筑气候适应性通风调控方法

为得出住宅建筑室内可接受热环境的气候适应性通风调控方法,根据适应性模型理论,以aPMV模型为基础,结合重庆地区的调研结果分析得出住宅建筑室内可接受的温度范围;基于状态空间法对重庆地区住宅建筑常用的通风调控技术进行分析研究,包括不同换气次数和分时段设置通风对室内温度的作用分析,从房间温度整体分布角度提出了重庆地区通风技术的分月调控方法;结合室外温湿度等参数的温湿图,具体分析了通风调控对室外气候参数的调控有效区域,得到各月通风调控方法的气候适应性区域。提出的基于室内热舒适适应性模型的可接受热环境的通风调控策略有利于建筑的热工设计和寻求设备的经济运行方式。     

六品系猪SLA-2多肽结合区分子结构差异研究

为研究我国饲养的不同品系猪sLA_2抗原多肽结合区分子结构差异,设计引物,克隆了六品系猪SLA-2基因cDNA全长序列,用分子生物学软件分析其基因特征,比较各品系猪SLA-2分子结构差异,并通过同源模建显示变异住点的空间位置．结果表明,六品系猪SLA-2cDNA全长为1119bp,其中3-1097为编码区,共编码364个氨基酸,分别在第125,188,227,283位置出现半胱氨酸残基,含有2对链内二硫键．六品系猪SLA-2胞外区氨基酸差异主要集中在α1区的62-70及77-82和口2区的143-156．同源模建显示,这些变异位点均位于SLA-2多肽结合区的口螺旋结构上,推测可能与动物的抗病毒免疫特性有关．可为猪品系的改良及抗病毒免疫研究提供参考．     

Cohen-Grossberg神经网络的吸引域以及稳定性分析(英文)

分析了Cohen-Grossberg神经网络的指数稳定性(局部指数稳定和全局指数稳定).给出了基于矩阵测度的判定Cohen-Grossberg神经网络的指数稳定的充分条件.并且对于局部指数稳定的平衡点,给出了其吸引域的估计;对于全局指数稳定的平衡点,给出了其指数收敛的速率.该结果可以用于神经网络容错能力的估计以及其指数收敛速率的估计,因此在设计Cohen-Grossberg神经网络中具有很重要的现实意义.     

A new biselector chiral stationary phase derived from tartaric acid and its enantioseparation evaluation

Two chiral selectors were synthesized from tartaric acid. The selectors were simultaneously immobilized on 3-aminopropyl silica gel to obtain a new biselector chiral stationary phase (CSP) in order to determine the influence of selector structure of biselector CSPs on the chiral recognition capability. For comparison, the single-selector CSP was also prepared. The biselector CSP shows an improved overall chiral recognition capability in comparison with the single-selector CSP. During the enantioseparation, temporary diastereoisomers are likely formed by complexation between a chiral analyte and the two selectors on the biselector CSP. The functional groups in the two selectors are complementary in electronic effect and/or in steric hindrance for the chiral recognition.     

多因素影响的梯形明渠三维流动规律

为了研究梯形明渠三维流动规律,使用流体动力学软件Fluent的Realizable k-ε模型对梯形明渠进行了模拟.首先,数值模拟了边坡坡度比为1、流速为1m/s条件下的三维流动.数值结果表明:对称面上流速的沿程变化不显著,底区流速满足对数律分布,外区流速用乘幂公式拟合有一定的误差.其次,分析了同一高度横向各点的速度值、静压、总压的沿程变化,壁面上不同高度切应力、总压的沿程变化和出入口的总压差.最后,考察了8种不同坡度、8种不同流速情况下边壁、床面的切应力、总压的变化趋势,得到了切应力和总压随流速的计算公式,揭示了梯形明渠的流动规律.