高强、超高强混凝土的脆性研究

通过研究高强、超高强混凝土的脆性特点、机理影响因素及其改善措施,结果表明混凝土作为一种准脆性材料,极易发生脆性破坏,特别是在高强混凝土中出现了明显的脆性破坏的性状,至今还没有适当的参数来定量地表示脆性。通过掺入矿物掺合料、纤维增强材料和高聚物可从不同方面对高强、超高强混凝土的脆性进行改善,复合和综合是改善高强、超高强混凝土的脆性的方向和途径。     

文化再生之发展规划路程--以陕西礼泉县袁家村为例

袁家村从一个物质文化双重匮乏的村子,后以发展文化为基点,为乡村的发展提供了强有力的支撑,使之最终成为现代化文化产业示范基地,打造了全国知名的乡村旅游品牌。在这期间,袁家村经历了寻找文化、复制文化、创造文化、衍生文化四个过程。     

新型堵漏材料在西港电厂项目的运用实践

燃煤电厂的地下煤斗及煤廊为承受荷载的地下结构,常规的注浆方法无法用于其防渗堵漏.为此,采用强堵-堵排结合-刚柔相济的原则,并以新型堵漏材料,成功地堵住了地下廊道的压力水,为电厂的顺利投产提供了保障.     

平面有限元网格自动生成在地下洞室中的应用

本文利用等参数有限元坐标分片映射的原理系统地讨论了多连通域的平面有限元网格、结点自动生成方法,并给出多夹层,多裂缝、多种单元组合情况下各种生成方法和裂缝扩展情况下网格重新生成问题。附例表明,方法有效。     

Exposure to Diflubenzuron Results in an Up-Regulation of a Chitin Synthase 1 Gene in Citrus Red Mite,Panonychus citri (Acari: Tetranychidae)

Chitin synthase synthesizes chitin, which is critical for the arthropod exoskeleton. In this study, we cloned the cDNA sequences of a chitin synthase 1 gene, PcCHS1, in the citrus red mite, Panonychus citri (McGregor), which is one of the most economically important pests of citrus worldwide. The full-length cDNA of PcCHS1 contains an open reading frame of 4605 bp of nucleotides, which encodes a protein of 1535 amino acid residues with a predicted molecular mass of 175.0 kDa. A phylogenetic analysis showed that PcCHS1 was most closely related to CHS1 from Tetranychus urticae. During P. citri development, PcCHS1 was constantly expressed in all stages but highly expressed in the egg stage (114.8-fold higher than in the adult). When larvae were exposed to diflubenzuron (DFB) for 6 h, the mite had a significantly high mortality rate, and the mRNA expression levels of PcCHS1 were significantly enhanced. These results indicate a promising use of DFB to control P. citri, by possibly acting as an inhibitor in chitin synthesis as indicated by the up-regulation of PcCHS1 after exposure to DFB.     

文化再生之发展规划路程--以陕西礼泉县袁家村为例

袁家村从一个物质文化双重匮乏的村子,后以发展文化为基点,为乡村的发展提供了强有力的支撑,使之最终成为现代化文化产业示范基地,打造了全国知名的乡村旅游品牌。在这期间,袁家村经历了寻找文化、复制文化、创造文化、衍生文化四个过程。     

新型一袋化堵漏技术在塔河油田中的应用

针对塔河油田奥陶系缝洞型储层易井漏、堵漏浆难以滞留、堵漏配方和工艺复杂的难题,提出了理想填充-紧密堆积理论结合的思路。通过优选可酸溶堵漏材料及其颗粒级配,研究形成封堵1～5 mm不同尺寸裂缝的5套堵漏配方,室内承压能力在10 MPa以上,酸溶率超过75%。上述堵漏配方分别生产为一袋化产品,在塔河油田X13H井和X193井奥陶系储层堵漏均一次成功。新型一袋化堵漏技术的配方颗粒级配和施工工艺合理有效,且实现了可酸溶解堵。     

Genome-Wide Identification and Expression Patterns of the SWEET Gene Family in Bletilla striata and its Responses to Low Temperature and Oxidative Stress

SWEETs (sugars will eventually be exported transporters), a well-known class of sugar transporters, are involved in plant growth and development, sugar transport, biotic and abiotic stresses, etc. However, to date, there have been few investigations of SWEETs in Orchidaceae. In this study, 23 SWEET genes were identified in Bletilla striata for the first time, with an MtN3/saliva conserved domain, and were divided into four subgroups by phylogenetic tree. The same subfamily members had similar gene structures and motifs. Multiple cis-elements related to sugar and environmental stresses were found in the promoter region. Further, 21 genes were localized on 11 chromosomes and 2 paralogous pairs were found via intraspecific collinearity analysis. Expression profiling results showed that BsSWEETs were tissue-specific. It also revealed that BsSWEET10 and BsSWEET18 were responsive to low temperature and oxidative stresses. In addition, subcellular localization study indicated that BsSWEET15 and BsSWEET16 were localized in the cell membrane. This study provided important clues for the in-depth elucidation of the sugar transport mechanism of BsSWEET genes and their functional roles in response to abiotic stresses.     

一种高效过滤-提纯音频大数据检索方法

针对互联网音频大数据的高速检索问题,结合音频指纹技术与过滤-提纯思想,提出一种面向音频大数据的鲁棒高效检索方法.在经典的Philips音频指纹基础上,提出了一种基于bag-of-features(BoF)的音频中间过滤指纹用于快速缩小检索范围,与Fibonacci Hashing检索相比提高检索速度约130倍;并设计了一种基于阈值的固定间隔抽样匹配方法,大幅减少匹配计算量,进一步提高检索速度可达140倍.实验结果显示：使用该方法在约10万首音频中对不同时长的音频片段进行批量检索,平均检索时间均小于1s;对音频进行MP3转换、重采样、随机剪切后再检索,召回率均在99.47%以上,理论准确率接近100%.