豫西传统民居的地域性文化价健诠释——以巩义市为例

现令我国的广大农村地区,分布着大量的传统民居,其文化价值属性和内容十分丰富,是地域性文化的物质载体之一。在目前城市化的快速发展阶段,展开对地域性建筑文化的挖掘和研究是当前面临的重要任务。该文基于地域性文化的视角,明确地域性文化的认知基础是当地的景观风貌特征。在对豫西地区地貌、气候等自然环境特征进行分析的基础上,尝试从村落布局、院落形式、入口设计、建筑技术、建筑材料等方面,以巩义市传统民居为例,对豫西地区传统民居的地域性特征进行诠释。     

复杂条件下钢拱桥整体吊装技术

结合北京银帆·西雅图工程商业楼中央天井18m跨度钢拱桥安装,介绍了因施工环境限制,在安装时无法使用任何起重设备的情况下,利用周边已有条件和简单的起重工具(钢丝绳、卷扬机、滑轮等),安全进行钢拱桥整体运输和安装的方法.实践证明,该方法机动灵活,安全高效,非常适合本工程的特点.     

Modeling of gas diffusion layers with curved fibers using a genetic algorithm

This paper presents a methodology for modeling microstructures of fibrous porous media with curved fibers. The developed methodology utilizes implicit periodic surface model coupled with the genetic algorithm (GA) optimization to construct the porous microstructures. The fibers profile is represented by the periodic implicit surfaces and their orientation and curvature are determined by GA optimization. To reconstruct the microstructures with higher resemblance to the actual porous media GA is utilized to minimize the fibers stored strain energy and their intersection volumes. Coupling the image processing techniques to the geometry construction procedure the morphological and transport properties of the constructed microstructures are also determined. To verify the feasibility and the accuracy of the proposed methodology the microstructure of Freudenberg H2315 GDL is constructed and characterized. The presented methodology enables a parametric design approach. Thus, the effects of the microstructure's properties e.g., fibers diameter, fibers orientation and porosity of the porous structure on the transport properties of the fibrous media are investigated.     

Controlled enzymatic hydrolysis on characteristic and antioxidant properties of soybean protein isolate-maltodextrin conjugates

This study aimed to investigate the effect of limited hydrolysis on conformational and antioxidant properties of soy protein isolate-maltodextrin (SPI-Md) conjugates. Extrinsic fluorescence analysis showed unfolding of the protein molecule and exposure of hydrophobic groups in SPI-Md conjugate hydrolysates. Free amino acid analysis showed that, the contents of hydrophobic amino acids in SPI-Md conjugates increased after hydrolysis. The contents of leucine, isoleucine, phenylalanine increased from 0.32, 0.30 and 0.54 to 1.36, 1.86 and 2.60, respectively, when the hydrolysis degree (DH) gradually increased from 0% to 5.7%. The FT-IR spectrum showed that C = O absorption of the amide group formed by glycosylation continued unabated after limited hydrolysis (DH 2.9%). The glycated SPI products showed good reducing power and superior resistance to lipid oxidation (34%, 12 mg mL^?1), whereas the limit hydrolysates (DH 2.9%) of SPI-Md conjugates showed more ef?cient radical-scavenging capacity (89.5%, at 12 mg mL^?1) and iron-chelation activity (91.3%, at 12 mg mL^?1). Results of this study indicated that, slight enzymatic hydrolysis (DH 0–2.9%) could help partially unfolding the globular structure of SPI-Md conjugates without deteriorating amide bonds and had a positive effect on their antioxidant properties.     

New pseudo-dynamic analysis of two-layered cohesive-friction soil slope and its numerical validation

Natural slopes consist of non-homogeneous soil profiles with distinct characteristics from slopes made of homogeneous soil. In this study, the limit equilibrium modified pseudo-dynamic method is used to analyze the stability of two-layered c-φ soil slopes in which the failure surface is assumed to be a logarithmic spiral. The zero-stress boundary condition at the ground surface under the seismic loading condition is satisfied. New formulations derived from an analytical method are proposed for the predicting the seismic response in two-layered soil. A detailed parametric study was performed in which various parameters (seismic accelerations, damping, cohesion, and angle of internal friction) were varied. The results of the present method were compared with those in the available literature. The present analytical analysis was also verified against the finite element analysis results.     

基于主成分分析和判别分析的大米产地溯源

以提高矿物元素对大米产地溯源的稳定性和准确性,找寻表征小范围相似地域特性的溯源指标为目的。采用原子吸收光谱法(AAS)分析吉林省松原市三大主产区10个产地100个大米样品中的矿物元素含量,对所得矿物元素含量数据进行差异分析、判别分析、主成分分析和聚类分析。试验结果实现了松原市三大主产区大米产地溯源,正确判别率为100%。松原市矿物元素溯源指标的筛选主成分分析结果:第一主成分主要由Zn、K、Mg、Na、Ca和Mn等6种元素构成,贡献率最大,占47.176%。判别分析验证主成分分析和聚类分析的准确性,其正确判别率为100%。利用矿物元素实现小范围产地溯源,并获得吉林省松原市溯源指标:Zn、K、Mg、Na、Ca和Mn 6种元素。     

超细纤维合成革的染色与功能整理研究进展

为了解决超细纤维合成革在制备、染色以及功能整理等方面出现的问题,系统阐述了超细纤维合成革的发展历程以及未来超细纤维合成革的发展方向;分析了染色工艺、染色助剂、染色基布的改性对聚酰胺超细纤维合成革染色性能的影响,评述了聚酯超细纤维合成革的染色现状;总结了国内超细纤维合成革经功能整理后的附加性能,包括阻燃、防污、抗静电、抗菌、耐寒、调温等。最后指出了未来超细纤维合成革在制备方式、高性能染色以及功能化整理方面应大力发展的方向,以对企业的产品优化升级、提高产品的市场竞争力提供指导。     

线圈形状及几何参数对电涡流传感器性能的影响

针对电涡流传感器探头线圈形状及其参数对传感器灵敏度和线性范围的影响问题，本文以Biol-Savart定律为基础，推导了具有梯形截面的矩形柱线圈和圆形柱线圈对称轴上任一点的磁场分布，确定了在以位移为检测量的电涡流传感器中采用圆柱线圈更合理，并通过有限元法研究和分析了在线圈匝数密度不变和变化2种情况下圆柱线圈内径、外径、厚度、截面形状（矩形、梯形和倒梯形）对传感器灵敏度和线性范围的影响，为合理选择线圈参数和优化传感器性能提供参考。     

合川地区低孔低渗砂岩储层含水饱和度的评价方法

合川地区上三叠统须家河组二段气藏属低孔低渗气藏,其储层孔喉结构复杂,造成了含水饱和度计算不准的问题。为此,研究了储层岩性、物性、孔喉结构和地层水特征对含水饱和度的影响,认为储层特征致使含水饱和度复杂多变,增加了储层含水饱和度的定量评价难度;以测井地质应用技术为指导,用核磁共振测井资料检验所求取的含水饱和度精度,探讨了Archie公式、Simandoux公式和印度尼西亚公式所建立的3种含水饱和度模型在合川地区复杂地质条件下的应用效果和影响因素。实践表明:Simandoux公式的解释结果与核磁测井含水饱和度值误差在-6.1%～2.6%,更加适合于研究区复杂地质条件下泥质砂岩含水饱和度的求取,为该区低孔低渗砂岩气藏勘探开发提供了技术支持;在没有适合于所有储层的含水饱和度模型情况下,油气田勘探开发时尽可能结合油气藏的储层特征多选用几种含水饱和度模型进行试算与分析,然后选取其中最适合的来应用。     

采前水杨酸处理对杏果实抗病性及苯丙烷代谢的诱导

以新疆赛买提杏为试材,在果实坐果期、膨大期、转色期及采收前48 h的4 个时期,采用1.0 mmol/L水杨酸对杏果实进行喷施处理,以喷清水处理作为对照。采收后的杏果实置于4 ℃、90%～95%相对湿度条件下贮藏,定期统计杏果实接种链格孢（Alternaria alternata）的病斑直径和接种发病率,测定苯丙氨酸解氨酶（PAL）、肉桂酸羟化酶（C4H）、4-香豆酰-辅酶A连接酶（4-CL）的活性及木质素、总酚和类黄酮的含量,研究采前水杨酸处理对杏果实抗病性和苯丙烷代谢关键酶活性及代谢产物积累的影响。结果显示：采前水杨酸处理能有效降低杏果实损伤接种的病斑直径和接种发病率,显著提高杏果实PAL、C4H、4-CL的活性和木质素、总酚、类黄酮的含量。