一种基于FPGA的实时视频采集与远程传输系统

以FPGA器件XC5VLX110T作为核心,选用芯片AD9980进实时视频采集,扩充大容量DDR2 SDRAM作为系统运算缓存,内置TEMAC控制器建立以太网通信链路,配置软核处理器MicroBlaze管理各模块,并设计配套软件,构成一种功能强大的视频采集板卡,并支持组网集中管理.     

Geochemical characteristics and diagenetic fluids of dolomite reservoirs in the Huanglong Formation, Eastern Sichuan Basin, China

Based on a comprehensive study of texture,diagenetic behavior and evolution of dolomite in the Huanglong Formation,trace （e.g.,Fe,Mn and Sr） and rare earth element （REE） geochemistry,andisotopic characteristics （e.g.,C,O and Sr）,four types of diagenetic fluids are identified in the Huanglong Formation dolomite reservoirs of the Eastern Sichuan Basin,China：1）：marine-derived pore waters in the marine diagenetic environment,2） sabkha compaction brine conserved in the early shallowburied diagenetic environment,3） strongly-oxidizing low-temperature meteoric water in the seepagesubsurface flow diagenetic environment,and 4） strongly reducing deeply seated mixed hot brine in the middle and deep burial diagenetic environment.The fluids developed hereditarily from one environment to another,which resulted in its respective characteristics.Fluid characteristics play an important role in the development of dolomite reservoirs：1） dolomitization by marine-derived pore water in the quasisyngenetic stage did not form an effective reservoir; 2） early diagenetic burial dolomitization by the sabkha compaction brine formed the basis for reservoir development; 3） meteoric water karstification in the paleo-epidiagenetic stage expanded both the distribution and the size of the reservoirs,and improved the reservoir quality; 4） deep-burial dissolution and tectonic fracturing in the reburial diagenetic stage further improved reservoir porosity and permeability.     

传统风格的节能办公建筑

本文以扬州老年文化里一栋实验性的节能办公建筑为例,针对历史文化街区中的传统风格建筑的节能问题展开研究,探索了将节能概念和措施与传统形式结合的可能性.     

矿井提升机传动系统远程维护平台研究

针对矿井提升机传动系统结构复杂、工作环境恶劣、运行状态频繁变化导致提升机故障类型多且维修困难,在分析提升机传动系统结构和故障原因的基础上设计了一种基于互联网传输矿井提升机传动系统远程维护平台。通过设置传感器获取提升机传动系统电气、温度、振动加速度等信号,通过数据分析仪分析信号来判断提升机传动系统的运行状态,实现了对提升机传动系统的远程维护。经测试,该平台可以实时、远程记录提升机传动系统的运行状态,并能及时根据异常信号做出预警,为矿业生产安全提供了保障。     

Genotypic variation of iron partitioning in rice grain

The present study investigates the variation of Fe concentration and partitioning in different grain tissues, particularly in the endosperm (white rice) among different rice cultivars from diverse genetic backgrounds. Iron concentration ranged from 10 to 20 mg kg^?1 in brown rice and 3–11 mg kg^?1 in white rice. Iron concentration in white rice was not correlated with that in brown rice. Polishing removed 25–84% of Fe from the brown rice, resulting in a low Fe concentration in the white rice and changed the ranking order for Fe concentration among the cultivars tested. Total Fe content in the whole grain including husk (r = 0.28, NS) and total Fe content in brown rice (r = 0.09, NS) was not significantly correlated with Fe concentration in white rice. Iron content in white rice was found to vary between 0.05 and 0.2 µg grain^?1 among cultivars tested, with the highest Fe content in cv. Sakha. Iron concentration in white rice was negatively correlated with total Fe content in the bran fraction, which is lost during the polishing process to produce white rice from brown rice (r = ? 0.82**). The partitioning of Fe between the endosperm and bran seemed to play a key role in achieving high Fe concentration in the white rice. The surface cell layers of the caryopsis appeared to be the main resistance of Fe partitioning into the endosperm (white rice) as there was a significantly negative correlation between Fe concentration in the white rice and Fe content in the bran, which is lost during the polishing process. Copyright © 2007 Society of Chemical Industry     

初探工程测量实践教学模式的改革

简要介绍了土木工程本科专业中有关《工程测量》课程实践教学传统模式的不足及国内学者提出的主要改革方法。从厦门大学嘉庚学院的人才培养目标和工程测量课程的特点出发,结合多年的教学改革经验,提出了一些实践教学改革的观点,并付诸于实践教学中,取得良好的效果。     

《土木工程概论》省级精品课程建设的体会及其对教学改革的启示

本文结合"土木工程概论"省级精品课程的建设过程,探讨了该课程在建设中如何体现土木工程专业应用型人才培养的几点经验,及下一步教学改革的努力方向。为该专业其它后续课程的建设以及如何突出应用型人才培养的目标提供了有益的借鉴。     

浅谈八里湖洪水调度分析

八里湖水面资源丰富,库容较大.现状的八里湖洪水调度方案因湖区边界条件的变化存在与现有排涝工程设计运行工况不相适应、难以操作等问题.本文根据现有的排涝闸(站)的设计运行工况,通过对历年降雨资料、外江水位、现状湖区调蓄能力及闸排、电排能力进行综合分析计算,并采用多工程联合调度,合理地确定了八里湖的现状汛期控制水位及起排水位等特征水位参数,有效的解决了调度方案与工程运行工况不适应和难以操作等问题,在确保八里湖防洪安全的同时,又能兼顾到城区景观用水.     

加权能耗最小化的无人机辅助移动边缘计算资源分配策略

针对无人机(UAV)辅助的移动边缘计算(MEC)系统,考虑到无人机能耗与地面设备能耗不在一个数量级,该文提出通过给地面设备能耗增加一个权重因子以平衡无人机能耗与地面设备能耗。同时在满足地面设备的任务需求下,通过联合优化无人机轨迹、系统资源分配以最小化无人机和地面设备的加权能耗。该问题高度非凸,为此提出一个基于交替优化算法的两阶段资源分配策略解决该非凸问题。第1阶段在给定地面设备的卸载功率下,利用连续凸逼近(SCA)方法求解无人机轨迹规划、CPU频率资源分配及卸载时间分配;第2阶段求解地面设备的卸载功率分配。通过两阶段的交替和迭代优化找到原问题的次优解。仿真结果验证了所提算法在降低系统能耗方面的有效性。     

Steering Local Electronic Configuration of Fe–N–C-Based Coupling Catalysts via Ligand Engineering for Efficient Oxygen Electroreduction

Fe–N–C materials are prospective candidates to displace platinum-group-based oxygen reduction reaction (ORR) catalysts, but their application is still impeded by the conundrums of unsatisfactory activity and stability. Herein, a feasible strategy of ligand engineering of the metal-organic framework is proposed to steer the local electronic configuration of Fe–N–C-based coupling catalysts by incorporating engineered sulfur functionalities. The obtained catalysts with rich Fe-N₄ sites and FeS nanoparticles are embedded on N/S-doped carbon (denoted as FeS/FeNSC). In this unique structure, the engineered FeS nanoparticles and oxidized sulfur synergistically induce electron redistribution and modulate electronic configuration of Fe-N₄ sites, contributing to substantially accelerated kinetics and improved activity. Consequently, the optimized FeS/FeNSC catalyst displays outstanding ORR performance with a half-wave potential of 0.91 V, better four electron pathway selectivity, lower H₂O₂ yield, and superior long-term stability. As a proof-of-concept, zinc-air batteries based on FeS/FeNSC deliver high capacity of 807.54 mA h g⁻¹, a remarkable peak power density of 256.06 mW cm⁻², and outstanding cycling stability over 600 h at 20 mA cm⁻². This study delivers an efficacious approach to manipulate the electronic configuration of Fe–N–C catalysts toward elevated catalytic activity and stability for various energy conversion/storage devices.