社会转型时期我国群众文化建设和发展的困境及其对策

＂群众文化＂是一个外延十分模糊而内涵却又非常丰富的概念,对其缺乏足够的重视,直接导致其作用的充分发挥。随着十八大报告的精神深入人心,建设中国特色社会主义文化成为学界的共识,＂群众文化＂也成为目前理论界的重点和热点之一。通过对＂群众文化＂的历史性、民族性和实践性的三大特点来对其进行理论上的梳理,在一定程度上可以更好地促进我国文化软实力的快速提升和推动中国特色社会主义文化建设的顺利进行。     

锚具变形、钢筋回缩和接缝压缩引起的预应力损失数值模拟与试验研究

先张法和后张法预应力混凝土构件预应力损失均含有锚具变形、钢筋回缩和接缝压缩损失,该项预应力损失是张拉锚固阶段主要预应力损失.利用《公路钢筋混凝土及预应力混凝土桥涵设计规范》（JTGD62-2004）中计算锚具变形、钢筋回缩和接缝压缩损失方法和ANSYS有限元分析软件中单元特点,提出了一种在有限元中模拟该项预应力损失的方法,并推导了该项预应力损失的数值计算公式.通过有限元模型的分析现场试验表明：两者结果吻合较好;可以在有限元模型中模拟锚具变形、钢筋回缩和接缝压缩损失,误差均在3％以内.     

大跨径连续刚构挠度控制与影响因素研究

针对预应力混凝土连续刚构桥梁挠度问题,采用室内试验和模型分析混凝土收缩徐变和预应力损失对结构挠度变形的影响。结果表明：混凝土徐变增长会导致桥面纵坡坡度变化,结构应力重分布。混凝土前期徐变系数增长快,持荷40d的徐变系数为1．004,180d时增幅仅为2．988％。桥梁顶板预应力损失对结构挠度变形影响比底板更明显,顶板预应力损失为20％时,运营两年的挠度增幅达67．5％。因此,混凝土结构物受荷加载不宜过早,对结构的挠度进行控制有利于提高桥梁的安全性能。     

风电技术在远洋鱿钓渔船上的可行性研究

随着近海渔业资源日渐匮乏,远洋渔业正蓬勃发展,其中的远洋鱿钓产业更是远洋捕捞的重要项目之一。本文主要根据远洋鱿钓渔船作业时所处海上环境以及远洋鱿钓渔船的作业特点、作业情况等,综合分析风力发电系统在远洋鱿钓渔船上运用的可行性,以期改变渔船传统能源消耗结构,保护海洋环境。     

海上长球首尾双体风电维护船阻力和耐波性能研究

近年来,海上风电场迅猛发展,风电维护船成为迫切需求。借鉴小水线面双体船优良的阻力性能和穿浪双体船优秀的耐波性能,根据中国海上风电场维护船航行的环境和使用特点,选用阻力和耐波性能优良的长球首尾双体船型作为风电场维护船型。在此基础上采用CFD数值仿真计算阻力性能,运用NAPA软件计算耐波性能。从而得到不同条件下较优良的船型,为海上风电维护船的设计提供一定的参考和借鉴。     

On-line Cache Resizing for Low-Power Microprocessors

We propose a novel scheme, called on-line cache resizing (OCR), to dynamically resize the cache and meet the size requirement of each application. At each periodic interval, the scheme gathers the cache hit-miss statistics at runtime using an extra tag array. These executing statistics serve as inputs to an analytical model of cache energy. The scheme uses energy as a primary metric to dynamically increase/decrease the number of active cache ways for the next interval. The scheme minimizes the active cache size to save energy with minimal performance loss. The simulation with SPEC 2000 benchmarks shows that OCR results in an average of 38.4% energy saving compared with fixed-size caches, with only 2.0% performance loss.     

一种实用的配电网潮流算法

目前matlab潮流计算程序多是基于输电网开发,而对配电网中潮流计算程序较少开发。配电网由于其特有的辐射性、R／X较大、节点较多的特性,导致用于输电网的潮流计算方法由于收敛性问题并不适用于配电网系统中。针对辐射性配电网的特点,开发了用于配电网潮流计算的matlab程序,该程序采用新的支路选择方法,无需对网络进行复杂的编号,并通过算例验证了程序的正确性。     

Numerical simulation of rock fracturing under uniaxial compression using virtual internal bond model

A multi-scale virtual internal bond (VIB) model for the isotropic materials has been recently proposed to describe the material deformation and fracturing. During the simulation process of material fracturing using VIB, the fracture criterion is directly built into the constitutive formulation of the material using the cohesive force law. Enlightened by the similarity of the damage constitutive model of rock under uniaxial compression and the cohesive force law of VIB, a VIB density function of rock under uniaxial compression is suggested. The elastic modulus tensor is formulated on the basis of the density function. Thus the complete deformation process of rock under the uniaxial compression is simulated.     

Site Earthquake Characteristics and Dynamic Parameter Test of Phase Ⅲ Qinshan Nuclear Power Engineering

The earthquake characteristics and geological structure of the site to sitting the Qinshan Nuclear Power Station are closely related. According to site investigation drilling, sampling, seismic sound logging wave test in single-hole and cross-hole, laboratory wave velocity test of intact rock, together with analysis of the site geological conditions, the seismic wave test results of the site between strata lithology and the geologic structure were studied. The relationships of seismic waves with the site lithology and the geologic structure were set up.The dynamic parameters of different grades of weathering profile were deduced. The results assist the seismic design of Phase Ⅲ Qinshan Nuclear Power Plant, China.     

In-home power line communication media access control protocol based on collision resolution

Most existing media access control (MAC) protocols in power line communication (PLC) networks just discard the colliding data packets when collision occurs. The collision deteriorates throughput and delay performance of system under high traffic conditions. This article presents a novel media access scheme with fast collision resolution for in-home power line networks. It works by first recognizing the colliding stations through detecting the inserted unique ID sequence ahead of data packets, then the source nodes retransmitting their packets immediately after the collision slot. The proposed protocol maintains the benefits of ALOHA systems. It needs no scheduling overhead and is suitable for bursty sources, such as multimedia data packets. Computer simulations have demonstrated that this approach can achieve high throughput due to its ability of resolving collisions.