路桥过渡段软土地基加固沉降对比分析

为比较抗滑桩与CFG桩的加固效果,以某高速公路软土地基路桥过渡段为例,基于FLAC3D模拟计算抗滑桩和CFG桩加固路基填筑后Z方向的地表沉降。台背后20 m范围内的计算结果为：(1)抗滑桩只对其周围土体有加固挤密作用,对距桩体1 m以外的加固作用较弱,分别发生0.62～13.28 cm的沉降;(2)CFG桩加固方案中,桩心距为1.8 m区域的沉降量在2.5 cm以内,桩心距为3.6 m区域沉降量在4 cm以内,在加固区域地基中没有出现土体破坏和生滑动现象,因此采用CFG桩为该桥台的加固方案。对完工的CFG桩进行单桩竖向抗压静载试验与沉降监测,测得台后20 m处桩顶总沉降值为3.89 cm,与数值模拟结果吻合,说明CFG桩可有效减少地基塑性区域、提高地基承载力和降低沉降量。     

聚吡路导电织物的制备及其性能研究

采用聚吡咯化学气相沉积法和聚吡咯化学液相沉积法制备聚吡咯导电织物,通过实验观察两种方法制备导电织物性能上的区别.研究氧化剂、掺杂剂对导电织物电学性能的影响.结果表明:氧化剂浓度越大,制备的导电织物导电性越好,当浓度增加到一定程度,织物表面比电阻值不随浓度的增加而变小.掺杂剂浓度的变化,对织物表面比电阻值大小影响不是很大.相比之下,采用化学气相法制备的导电织物,织物导电性好,而且纤维表面光滑、均匀,其受刺激的响应灵敏度较好.     

大型煤化工项目输煤程控系统的优化

在介绍输煤系统的工艺流程、主要设备和控制要求的基础上,分析了以往的输煤程控系统设计方案,发现此方案存在电缆需求大造成成本高、桥架增多导致设计麻烦,存在电磁干扰影响可靠性的缺点.针对存在的问题,提出了采用西门子远程I/O站的解决方案,并介绍了新方案的特点和优点.通过对两种方案在昊源煤化工项目的对比,可以看出新方案可节约电...     

Parametric study of a new HOS-CFD coupling method

This paper presents a developed new coupled method which combined our in-house CFD solver naoe-FOAM-SJTU and naoe-FOAM-os with a potential theory High Order Spectral method(HOS).A parametric study of nonlinear wave propagation in computational fluid dynamics(CFD)zone is considered.Mesh convergence,time step convergence,time discretization scheme and length of relaxation zone are all carried out.Those parametric studies verify the steady of this new combined method and give better choice for wave propagation.The dissipation in propagation of nonlinear regular wave can be lower than 3%in static mesh,and less than 2%in overset grid mesh.Meanwhile,a LNG FPSO is put into the viscous wave tank to study the suitable size of CFD zone.To achieve a better solution with least calculating resources and best numerical results,the length of CFD zone is discussed.These parametric studies can give reference upon employment of the potential-viscous coupled method and validation of the coupled method.     

淮钢25MW机组电液控制改造可行性分析

淮钢25MW汽轮机为东方汽轮机厂生产的NC25-3.43型抽汽凝汽式汽轮机,一级抽汽供公司焦炉用。该机组液压控制系统为机械液压控制方式,若将其液压控制系统进行部分改进,实现数字式电液控制(Digital Electro-Hydraulic Control,简称DEH),对控制策略灵活编程,可全面提高机组自动控制水平和机组运行质量,降低能耗,提高效率。笔者根据工作经验,就机组改造方案及改造后优化功能进行分析,以期与同行探讨。     

Improving the precision of optical metrology by detecting fewer photons with biased weak measurement

In optical metrological protocols to measure physical quantities, it is, in principle, always beneficial to increase photon number n to improve measurement prec...     

固相萃取-高效液相色谱法测定某水库型水源地微囊藻毒素

采用优化的固相萃取一高效液相色谱法对某水库型水源地微囊藻毒素污染进行了为期1年的监测,同时测定了相关的水质指标和藻类种群结构。结果表明：该水库在春末和夏、秋季检出了3种微囊藻毒索（MC—YR、MC—RR、MC—LR）,以MC—YR为主,夏季是藻毒素污染的高峰时段,其浓度与水库环境条件、藻类生物量有密切的关系。     

某开裂现浇板碳纤维布加固后正常使用性能的评定分析

针对某开裂现浇楼板用碳纤维布进行加固补强后的正常使用性能进行了现场荷载试验,对加载过程中加固板的变形进行了测量,并将实测结果与加固后楼板挠度的理论计算结果进行了对比分析。结果表明,在开裂楼板板底粘贴碳纤维布不仅可以起到加固补强的作用,而且,还可以明显提高其正常使用性能,大大减小其变形。     

Characterization,Expression Profiling,and Biochemical Analyses of the Cinnamoyl-CoA Reductase Gene Family for Lignin Synthesis in Alfalfa Plants

Cinnamoyl-CoA reductase (CCR) is a pivotal enzyme in plant lignin synthesis, which has a role in plant secondary cell wall development and environmental stress defense. Alfalfa is a predominant legume forage with excellent quality, but the lignin content negatively affects fodder digestibility. Currently, there is limited information on CCR characteristics, gene expression, and its role in lignin metabolism in alfalfa. In this study, we identified 30 members in the CCR gene family of Medicago sativa. In addition, gene structure, conserved motif, and evolution analysis suggested MsCCR1–7 presumably functioned as CCR, while the 23 MsCCR-likes fell into three categories. The expression patterns of MsCCRs/MsCCR-likes suggested their role in plant development, response to environmental stresses, and phytohormone treatment. These results were consistent with the cis-elements in their promoters. Histochemical staining showed that lignin accumulation gradually deepened with the development, which was consistent with gene expression results. Furthermore, recombinant MsCCR1 and MsCCR-like1 were purified and the kinetic parameters were tested under four substrates. In addition, three-dimensional structure models of MsCCR1 and MsCCR-like1 proteins showed the difference in the substrate-binding motif H212(X)2K215R263. These results will be useful for further application for legume forage quality modification and biofuels industry engineering in the future.     

泡辣椒发酵过程中质构劣化规律及其影响因素研究

该研究考察了泡辣椒在发酵过程中质构、微生物数量、理化特性的变化规律,并在此基础上,进一步采用皮尔逊相关性分析法探讨微生物数量、理化特性与产品质构之间的相关性。结果表明,泡辣椒发酵过程中硬度和咀嚼性下降,脆度上升。在发酵前2天,乳酸菌及真菌迅速增殖,pH值迅速下降,总果胶酶活力升高;发酵2 d后,乳酸菌数量、pH值趋于稳定,真菌逐渐消失,总果胶酶活力迅速下降后趋于稳定。在酸和盐的共同作用下,泡辣椒释放自由水,水分含量降低,同时部分自由水逐渐转化为不易移动水,导致产品水分活度（Aw）下降。相关性分析结果表明,泡辣椒硬度、脆度和咀嚼性质构指标的变化主要与总果胶酶活力、水分含量及水分存在状态显著相关。