摘要：The construction of the Qinghai-Xizang Railway is facing some challenges posed by the presence of warm and ice-rich permafrost and predicted climate warming. To resolve these issues and ensure the railway a success, adjustments will have to be made in design strategies and principles. This paper presents several examples of permafrost-distribution anomaly caused by site-specific conditions. It analyzes the mechanism through which these local factors influence the occurrence and preservation of permafrost by modifying the heat convection and conduction patterns, and the amount of solar radiation received by the ground surface. A good understanding of these anomalies in permafrost occurrence is significant as it may provide some hints on the techniques and measures we can use to artificially simulate similar effects. A number of measures can be taken to lower ground temperature and to counter the effect of cli-mate warming. These measures include use of proper roadbed material and configuration, in order to adjust solar radiation, heat convection and conduction patterns. It is recommended that a new proactive approach be adopted in the railway design. This approach emphasizes the use of all the above-mentioned measures to cool down the roadbed. This is different from previous methods of preventing permafrost from thawing by utilizing more thermal resistant materials.

摘要：Taking the design of Yingmeng Plaza in Zitong County, Mianyang City for example, location feature and overall design objective were analyzed on the basis of design background. By analyzing the theme of Yingmeng Plaza, design principles were proposed as "based on overall functions, fully considering users' needs, showing characteristics of a tourist city and cultural city". Guided by the overall planar layout, the whole plaza was classified into 5 functional areas to highlight its landscape structure of "four centers, four axes, two districts and two belts". By following the concept of "Beginning of a dream- Expectations of the dream-Transition of the dream-Dream coming true", and considering theme and design principles of Yingmeng Plaza, design concepts of its major scenic spots were elaborated.

摘要：Engineered Cementitious Composite (ECC) is a cement based material with ultra-high ductility and strength in tension. This material is a kind of highperformance fiber-reinforced cementitious composite materials (HPFRCCs) reinforced with short fibers and characterized by tight multiple cracking. These characteristics of ECC make it applicable to increase the capacity and the ductility of structural elements so that structural design is economic and sustainable. This paper presents an extended evaluation of Improved Engineered Cementitious Composites (IECC) for the use in the strengthening of masonry in filled reinforced concrete frames. IECC is a mixture of cement, fly ash, water, sand, quartz powder and poly-vinyl alcohol fibers with a better quality of tensile strain rather than common ECC. Two types of fine sand and quartz powder used in this study as filler to improve ECC behavior. Also, to show the effect of fly ash on IECC properties, five different mixtures were considered with various fly ash ratios. Different mixtures of IECC using fine aggregates produced in Iran were selected to find out how the aggregates and fly ash would affect IECC performance. The results show that the optimized mixture has the best characteristics including tensile strength and strain. Also, three-dimensional diagrams were used to compare the properties of different mixtures of IECC more effectively and to represent the influence of the range of fly ash ratios so that it can be opted based on design objectives such as ECC properties, costs and structural parameters and demands. These diagrams show the behavior of IECC which its fly ash content ratio in the binder is 50% to 67%.

摘要：随着互联网产业和技术的不断发展,各型各色的基于互联网页面的Web应用也成为人们获取信息、娱乐、服务等的重要途径之一。这就对各个Web应用系统的性能提出了高要求。文中对Web性能优化技术中的local Storage的存储性能进行了研究与分析。针对技术本身存在的性能问题,设计了一系列实验来进行验证,探究解决性能问题的方案。实验发现,对local Storage存储空间频繁访问,会对系统性能造成较大影响。针对实验所暴露的local Storage所存在的性能问题,文中设计了对local Storage存储性能改进的方案,并根据该方案,对local Storage的存储结构进行了改进。以解决因对local Storage存储空间频繁访问所造成的系统效率降低。

摘要：为构成高性能的数据库,磁盘阵列的活用是很有必要的。其中尤为重要的是实现磁盘阵列之间负载的均衡。为此,设计了网络磁盘结构系统,该系统在磁盘阵列高负载的情况下也能够进行动态的负载均衡,并且具有优良的耐故障性。对于网络磁盘结构构成要素中的local Migration Manager(LMM)进行了设计。列举出了LMM连接的Main Bus上传送的信息,定义了信息形式,信息的传送与Bus的宽度相符呈分割进行;在LMM的设计方法中定义了LMM的内部数据结构;在此基础上,制作了LMM的算法。

摘要：随着嵌入式系统技术迅速发展,PowerPC处理器以其实时性好、运算能力强和接口丰富等特点被广泛应用于嵌入式设计中。PowerPC+FPGA架构为PowerPC嵌入式系统最常用架构,两者之间通过local Bus总线相连,实现对外功能扩展。local Bus为并行地址数据复用总线,地址锁存时机的选择对local Bus总线稳定工作尤为重要。文章基于PowerPC8640处理器通过设计和测试验证给出了其local Bus地址锁存同步设计和异步设计的方法。

摘要：群智创新社区是信息化条件下一种新的创新载体和媒介,可以为企业开展产品研发活动提供大量创新创意。为了更好地管理群智创新社区和用户,选取local Motors社区作为研究对象,通过对不同用户行为进行数据采集与分析,运用聚类分析,从用户创新能力的角度,对不同创新能力的用户进行识别和划分,得出4种不同创新能力的用户类型,并对每种类型的用户进行了社区影响作用分析。科研成果既可丰富相关理论研究,也可为社区管理者提供实践方略与运营建议,有效提升社区管理水平与创新效率。

摘要：This study points out existing problems in the present planning for the new countryside construction of Laoshan District, Qingdao City, Shandong Province. First, local features and industrial structures are ecologically analyzed as a whole; second, specific elaborations are given from 3 angles, guiding development by exploring characteristics, enhancing development by applying various modes, protecting features by taking steps from diverse perspectives, so as to play a referential role in the construction of new countryside in this district.

摘要：The construction of Peach Blossom Lake Waterfront Park on the Chan River in Xi'an City gives tourists and Xi'an citizens a waterfront *** participating the field investigation,feasibility study,demonstration of design scheme as well as extended preliminary design and construction drawing design of the project,the author studied the "maintenance" and "innovation" in constructing modern urban waterfront parks by combining landscape design knowledge and practices,that is to say,how to inherit Chinese traditional culture and gardening art while making innovations,and achieve the organic integration of traditional cultural elements and modern functional elements.

摘要：Structural analysis of steel frames is typically performed using beam elements. Since these elements are unable to explicitly capture the local buckling behavior of steel cross-sections, traditional steel design specifications use the concept of cross-section classification to determine the extent to which the strength and deformation capacity of a cross-section are affected by local buckling. The use of plastic design methods are restricted to Class 1 cross-sections, which possess sufficient rotation capacity for plastic hinges to develop and a collapse mechanism to form. local buckling prevents the development of plastic hinges with such rotation capacity for cross-sections of higher classes and, unless computationally demanding shell elements are used, elastic analysis is required. However, this article demonstrates that local buckling can be mimicked effectively in beam elements by incorporating the continuous strength method (CSM) strain limits into the analysis. Furthermore, by performing an advanced analysis that accounts for both geometric and material nonlinearities, no additional design checks are required. The positive influence of the strain hardening observed in stocky cross-sections can also be harnessed, provided a suitably accurate stress–strain relationship is adopted;a quad-linear material model for hot-rolled steels is described for this purpose. The CSM strain limits allow cross-sections of all slenderness to be analyzed in a consistent advanced analysis framework and to benefit from the appropriate level of load redistribution. The proposed approach is applied herein to individual members, continuous beams, and frames, and is shown to bring significant benefits in terms of accuracy and consistency over current steel design specifications.