Theoretical and experimental study on seismic response control on top of Three-Gorges ship lift towers using magnetorheological intelligent isolation system and its key technique

A vertical ship lift under earthquake excitation may suffer from a whipping effect due to the sudden change of building lateral stiffness at the top of the ship lift towers. This paper proposes a roof magnetorheological (MR) intelligent isolation system to prevent the seismic whipping effect on machinery structures. Theoretically, the dynamic models of MR damper and the mechanical model of ship lift was established, the inverse neural network controlling algorithm was proposed and the fundamental semi-active control equation for the Three-Gorges ship lift where the MR intelligent isolation system was installed was deduced. Experimentally, the experimental model of the ship lift was given, the vibrating table experiment of the MR intelligent isolation system controlling the whipping effect was carried out and the results of the inverse neural network control strategy and passive isolation strategy were compared. In practical aspect, the large-scale MR damper (500 kN) and a sliding support with limited stiffness were designed and fabricated. It was proven that the MR intelligent isolation system with proper control strategy can greatly reduce the seismic whipping effect on the top workshop of the ship lift and be simple and effective enough to be applied to real engineering structures.     

意大利设计师Marco Maran及其作品

通过对意大利著名家具设计师Marco Maran生平、设计理念以及最新设计作品的分析,指出设计师只有热爱生活,并将技术、艺术和生活完美结合,才能成就优秀的设计,并希望中国年轻年设计师能从中得到启示。     

Simultaneous Detection and Differentiation of Campylobacter jejuni, C. coli, and C. lari in Chickens Using a Multiplex Real-Time PCR Assay

A multiplex real-time PCR (qPCR) assay was developed for simultaneous detection and differentiation of the three most important Campylobacter species in chickens. Three novel sets of PCR primers and TaqMan probes were designed to amplify the unique DNA sequences within the hipO, cdtA, and pepT genes which are specific to Campylobacter jejuni, Campylobacter coli, and Campylobacter lari, respectively. To avoid competition in the multiple target amplifications, the concentrations of primers and probes were optimized. By using the optimized qPCR conditions together with a minor-groove binding probe of pepT, amplification efficiency greater than 92% and detection sensitivity of 38 genome copies/reaction have been achieved for all three targets. The assay was highly specific for C. jejuni, C. coli, and C. lari with testing of 33 Campylobacter strains and 20 non-Campylobacter strains. In chicken samples spiked with known quantities of Campylobacter cells, the assay was able to detect 1 CFU/g after a 24-h enrichment. Application of the assay in food was further evaluated using 21 fresh chicken samples obtained from local supermarkets. The results revealed that, after a 24-h or 48-h enrichment, 14 samples (66.7%) were positive for C. jejuni, five samples (23.8%) were positive for C. coli, and none of the samples was contaminated by C. lari. Taken together, the multiplex qPCR assay combined with an enrichment step is a sensitive, species-specific, and non-labor-intensive method suitable for rapid detection of C. jejuni, C. coli, and C. lari in chicken samples.     

葛根软糖的研制

以葛根粉为主要原料,通过对比试验对凝胶剂进行最佳选择,结果表明选择琼脂作为凝胶剂口感最佳。通过正交试验确定产品的最佳配方为:葛根粉8g,淀粉糖浆120g,白砂糖40g,琼脂2%,柠檬酸0.3g,柠檬酸钠0.1g;在40℃下干燥(24～30)h后,所得软糖具有良好的咀嚼性及口感,综合品质良好。     

60Co-γ辐照对卵清蛋白糖基化体系结构和糖基化产物的影响

为探究60Co-γ辐照对糖基化体系结构和糖基化产物的影响,以卵清蛋白(OVA)-葡萄糖体系为研究对象,经0,25,50,75,100 kGy的60Co-γ辐照后,采用SDS-PAGE、荧光光谱、圆二色谱测定其分子质量、三级结构及二级结构的变化。借助高效液相色谱法、紫外光谱法测定其体系内产生的有害糖基化产物(果糖胺、丙烯酰胺、荧光性AGEs、戊糖素、类黑精)的含量。OVA分子质量和表面疏水性的增加、内源荧光强度和α-螺旋含量的降低、β-结构(β-折叠和β-转角)含量的增加表明,60Co-γ辐照呈剂量依赖性,促进了OVA与葡萄糖的糖基化反应。此外,60Co-γ辐照后体系内产生的果糖胺、丙烯酰胺的含量呈现先上升后下降的趋势,在辐照剂量为50 kGy时达到最大值。荧光性AGEs、戊糖素、类黑精的含量以剂量依赖性方式增加。综合来看,为了减少辐照加工过程中蛋制品内有害糖基化产物的含量,提高其安全性,需将60Co-γ辐照的剂量控制在25 kGy以内。本研究结果为未来扩展食品辐照技术在蛋制品方面的应用提供一定的科学依据。     

紫外光固化低黏度环氧丙烯酸酯的合成

引入新的催化剂和新的阻聚剂构成催化-阻聚复合助剂体系,合成了可紫外光固化的低黏度环氧丙烯酸酯树脂,利用傅里叶变换红外光谱、核磁共振氢谱、碳谱对树脂结构进行了表征;研究了复合助剂及常用的催化剂、阻聚剂对反应过程及树脂性能的影响,发现复合助剂体系具有更好的催化和阻聚效果,反应活化能仅为37.69 kJ·mol-1·K-1,所得树脂黏度仅为3 000～4 000 mPa·s(60℃),为市售产品的1/3;最后利用综合热分析仪对树脂固化膜的耐热性能进行了分析.     

地下非开挖工程中的高齿扩孔牵引管施工技术

针对传统导的向钻进铺管技术中存在的扩孔成型判断及泥浆处理两大难题,提出采用叶片状高齿扩孔钻头、根据不同管径循序逐级改换扩孔钻头进行扩孔清孔的高齿扩孔牵引管施工技术。并介绍了其主要施工工艺及技术要点。工程实例表明,高齿扩孔牵引管施工技术适用于非流砂地层和淤泥质土层的各类地下管线牵引施工,具有较好的社会及经济效益。     

碗型混凝土箱梁施工组合模板及支撑体系应用研究

武汉卓刀泉立交桥为现浇连续碗型箱梁结构,弧形清水混凝土对模板的要求较高,针对市中现场施工条件,介绍了采用较柔性易弯的竹塑模板＋碗型钢托架＋碗扣式钢管满堂脚手组成的模板支撑体系,取得了节省造价、缩短工期、保证清水混凝土质量的良好经济和社会效益。     

数据中心极早期火灾探测及火灾探测器的选择

在对数据中心的火灾形成和蔓延特性进行分析的基础上．以及对点型火灾探测器的特点进行剖析的前提下．提出数据中心的极早期火灾探测应采用空气采样烟雾探测报警系统和线型光纤火灾自动报警系统．并阐述了这两种极早期探测系统的应用方法和应用范围．     

水热合成NaNbO3粉体的研究

采用Nb2O5,NaOH为反应原料,在180℃～200℃下通过水热法合成出结晶度高、晶粒发育完整的NaNbO3粉体。利用X射线衍射分析（XRD）对产物的物相结构进行了表征,并用扫描电子显微镜（SEM）观察了晶粒的结晶形貌、尺寸以及分布情况。研究结果表明：合成的NaNbO3粉体为正交相结构,晶胞参数a=5.569,b=15.523,c=5.505;水热合成温度影响体系的反应速度,温度越高反应速度越快;晶粒的尺寸随着反应时间的增加而增大。