基于MIDAS对三屯河水库溢洪道拱基础结构稳定性及配筋复核分析

拱结构主要以桥梁的形式出现在交通工程中,在水工结构作为底部基础较为少见.随着使用年限的增加不可避免的需要对水工结构进行除险加固,本文通过三维有限元分析软件Midas对三屯河水库溢洪道泄槽底部拱基础进行结构分析和配筋复核.计算结果表明:拱结构运行期在自重及新建泄槽水重作用下,拱顶最大竖向位移0.75mm,主拱最大拉应力为...     

城市路网联络线方案研究

结合东直门交通枢纽改造实例,介绍了联络线方案的制定研究过程,对相关问题进行了研究和探讨。     

辣椒制品中铁粉控制技术的研究

总结了近两年韩国对我国辣椒制品中的铁粉超标通报情况,根据通报情况,主要针对辣椒种子粉中的铁粉含量的分布规律进行了实验,并探讨了辣椒制品中的铁粉控制措施.按照文章所提出的控制措施,可将辣椒种子粉中的铁粉含量控制在10×10-6以下.     

固相萃取柱净化-超高效液相色谱-串联质谱法快速测定液态乳中14 种真菌毒素

建立使用固相萃取柱净化液态乳中14 种真菌毒素（黄曲霉毒素B1、黄曲霉毒素B2、黄曲霉毒素G1、黄曲霉毒素G2、黄曲霉毒素M1、赭曲霉毒素A、橘霉素、T-2毒素、杂色曲霉素、伏马毒素B1、伏马毒素B2、玉米赤霉烯酮、脱氧雪腐镰刀菌烯醇、青霉酸）多残留的超高效液相色谱-串联质谱检测方法。样品经含0.1%甲酸-乙腈沉淀蛋白和提取,固相萃取柱Oasis PRiME HLB净化后,以0.1%甲酸溶液与乙腈为流动相,经ACQUITY UPLC HSS T3色谱柱（2.1?mm×100?mm,1.8?μm）分离,梯度洗脱,采用电喷雾-正离子多反应监测模式,外标法定量。结果表明：14?种真菌毒素的定量限（RSN≥10）为0.5～5?μg/kg,高、中、低3?个添加水平时,平均回收率为67.7%～112.7%,相对标准偏差为0.43%～7.28%。该方法的检测速度快,净化效果较好,基质干扰较少,灵敏度高,结果准确、可靠,可用于液态乳中真菌毒素的检测分析。     

Word Spotting Based on a posterior Measur of Keyword Confidence

In this paper,an approach of keyword confidence estimation is developed that ewll combines acoustic layer scores and syllable-based statistical language model(LM)scores.An a posterioir(AP)confidence measure and its forward-backward calculating algorithm are deduced.A zero false alarm(ZFA) assumption is proposed for evaluating relative confidence measures by word spotting task.In a word spotting experiment with a vocabulary of 240 keywords,the keyword accuracy under the AP measure is above 94%,which well approaches its theoretical upper limit.In addition,a syllable lattice Hidden Markov Model(SLHMM) is formulated and a unified view of confidence estimation.word spotting,optimal path search,and N-best syllable re-scoring is presented ,The proposed AP measure can be easily applied to various speech recognition systems as well.     

零位光栅的计算机设计与性能评定

圆光栅传感器采用零位光栅提供绝对零位信号,以防止掉电时数据丢失.在零位光栅设计过程中,通过设置阈值,将计算机产生的随机序列转换成布尔值序列,并利用两条经验结论作为判断条件,计算、比较后得到满足要求的栅线序列.分析零位光栅刻线序列的特点,得出了一些对于零位光栅刻划具有指导意义的结论.     

安全组播仿真系统研究与实现

针对组密钥管理方案的性能评价问题，提出了一个安全组播管理系统仿真平台方案（GKMSP）并阐述了其仿真机制．平台的设计采用了模块化设计的方法，便于集成多种经典解决方案或经典算法，并使用了离散用户事件驱动的仿真机制，可仿真任意用户分布特征，以帮助分析或改进不同方案的性能．仿真试验中，成功地应用该平台对几种经典组密钥管理方案的性能做出评价，证明了该平台的有效性．     

邯郸市水资源税改革试点工作的探讨

阐述了邯郸市推进水资源税改革的重要意义,分析了当前试点工作面临的问题,提出了进一步规范取用水秩序、保障水资源管理经费开支、建立健全水价调整机制及加强节水能力建设4点建议,以深化全市税改工作。     

Biomineralization of the surface of PLGA-(ASP-PEG) modified with the K<Subscript>16</Subscript> and RGD-containing peptide

K₁₆ and RGD-containing peptide was used to modify the surface of three-dimensional PLGA-(ASP-PEG) matrix, then the modified PLGA-(ASP-PEG) was incubated in modified simulated body fluid (SBF). The biomineralization of the modified PLGA-(ASP-PEG) was explored, and the peptide was synthesized with solid phase synthesis technology and linked covalently to PLGA-(ASP-PEG) through cross-linker (Sulfo-LC-SPDP), which was characterized with XPS. The modified PLGA-(ASP-PEG) (Experiment group, EG) and PLGA-(ASP-PEG) (Control group, CG) were all incubated into SBF for 10 d, and the growth of hydroxyapatite (HA) nanocrystals was confirmed with XRD, EDS and SEM. HPLC shows that peptide purity is 94.13%, while MS analysis shows that molecular value of peptide is 2741.26. Binding energy of the sulphur in EG was 164 eV is detected by XPS, and the ratio of carbon and sulphur is 99.746:0.1014. SEM analysis demonstrates the better growth of bonelike HA nanocrystals in EG than that in CG. The component of mineral in EG consisted mainly of hydroxyapatite containing low crystalline nanocrystals, and the Ca/P ratio is about 1.60, which is similar to that of natural bone, while the Ca/P ratio in CG is 1.52. PLGA-(ASP-PEG) modified with peptide provided enough functional groups for biomineralization, and possessed the bonelike structure.     

基于分子跟驰特性的交通流局部稳定性分析

交通流稳定性分析是交通流特性分析的重要组成部分,对解析交通流运行规律具有重要的理论价值.运用分子动力学,系统解析交通流的分子跟驰特性,对处于稳定运行状态下的同步流车队进行局部稳定性分析,并建立车辆跟驰的局部稳定性模型和扰动波能量定量模型,利用Matlab软件对模型进行数值仿真分析,结果表明对于一个处于稳定状态下的同步流车队,跟随车在受到相邻前导车的扰动后能否保持原运行状态与车辆受到的扰动波能量δ大小有关.