强筋小麦磨制面包粉工艺研究

为了研究中国育成并大面积推广强筋小麦品种的面包粉制粉工艺,以中国第一批确定的强筋面包小麦品种陕优225为主要原料,以国产4皮3芯中型加工设备进行工艺研究,同时也进行了以陕优225小麦为主原料的配麦试验。结果表明,面粉蛋白质品质,即蛋白质含量、湿面筋含量均以皮磨高于芯磨,皮磨由1B到4B逐渐升高,芯磨则由1M到3M逐渐降低;面团流变学品质除吸水率外,形成时间、稳定时间、拉伸性均与蛋白质品质规律基本一致,所不同的是面团流变学品质以3B为最高;面包烘焙品质面包体积和面包总评分其规律性与面团流变学品质相一致,皮磨以3B皮最好,以1B最差,芯磨以1M最好,3M最差。配麦试验结果显示,以陕优225与另一形成时间长的强力面包小麦以85:15配麦,取2B、3B、4B、1M、2M、3M前路粉,依次配置筛目目数为100、120、130、100、120目和130目,面粉品质明显改善,面包烘焙评分提高5.0～8.8分。     

Seizure activity and lesions of neuronal cells by intrahippocampal injection of guanidinosuccinic acid in rats]

Intrahippocampal injection(ihci) of guanidinosuccinic acid (GSA) to rats, induced typical generarized clonic seizures and epileptiform discharges in electrohippocampogram (EHG) and electrocorticogram (ECoG), degenerative changes of neuronal cells in the injected side hippocampus. The pyramidal cells in CA1 area were found to be more vulnerable to GSA than the granular cells. Phenobarbital and phenytoin are typical antiepiletics, but in no case did they successfully protect against GSA induced convulsions, epileptiform discharges in the EHG and ECoG and neurolysis. Ketamine, a selective noncompetitive NMDA receptor antagonist, was shown to protect against not only seizures, but also neuronal cell damage induced by GSA. All these results indicate that GSA very like the endogenous excitatory amino acid, glutamic acid, it also has such effects mentioned above. Therefore, the NMDA receptor may mediate both effects of GSA.     

Deformation behavior of styrene-block-butadiene-block-styrene triblock copolymers having different morphologies

Deformation behavior of styrene-block-butadiene-block-styrene (SBS) triblock copolymers having different morphologies was investigated. Due to the combination of different methods which provide information on different deformation levels (macroscopic, microscopic and molecular) complex deformation mechanisms for each type of SBS block copolymer (including glassy-rubber alternating lamellae, rubber cylinders in glassy matrix and hard domains in soft matrix morphology) could be revealed. In combination with tensile tests, Fourier transform infrared (FTIR) spectroscopy was successfully applied to study the change of orientation in individual phases using the absorption bands at 1493 and 966 cm⁻¹ for polystyrene (PS) and polybutadiene (PB) phases, respectively. For all the block copolymers investigated the PB phase always oriented stronger than the PS phase because of its lower Young's modulus. However, differences in orientation in both phases were influenced by an appropriate stress distribution within the specimens during deformation, which, in fact, depends on the morphology of the polymers. Additionally, atomic force microscopy revealed local morphological changes during uniaxial stretching, which, in fact, depend on the arrangement of the structural units.     

MC劲性复合桩与钻孔灌注桩在某工程项目中应用对比分析

MC劲性复合桩具有高承载力、低压缩性等优点.相较于常规钻孔灌注桩,MC劲性复合桩在一些淤泥、淤泥质土、含砂土或粉土较多土层较厚的土质,有很强的适应性和经济优势.本文主要介绍一实际工程项目上MC劲性复合桩与灌注桩应用对比研究结果,通过试桩及静载检测结果对比分析了两种桩型在该项目上的优劣和适用性.MC劲性复合桩环境污染小,造价较低,施工质量可靠、施工简便、施工速度快,单桩承载力较高,同时大幅度改善了桩间土的软弱状态和承载力参预度等优点,具有较高的经济效益与社会效益.本文提出了施工中应采取的措施及注意事项,并展望了 MC劲性复合桩在未来地基基础中的应用前景.     

CAVE系统中不规则多屏投影变换矩阵

常见的CAVE系统是由4个正方形投影面构成一个立体空间,将复杂的数据以可视化的方式展现,营造一个逼真的虚拟环境,带给用户一种非凡的沉浸式体验。本文在分析投影变换矩阵的基础上,通过构建CAVE投影坐标系,提出构建不规则投影变换矩阵的快速计算方法。该方法使CAVE系统不再局限于标准的立方体空间,并通过获取用户在CAVE投影坐标系下的坐标位置,实时计算投影变换矩阵,满足用户在任意空间位置下的最佳观测视角。     

传统风水文化对现代城市景观设计的影响

运用中国传统风水中的相地选址、景观特征、风水物等环境观念来分析与研究现代城市景观问题,一方面是为了揭开“风水”文化的神秘面纱,分清精华与糟粕,从而更好地传承与发扬中国的传统文化;另一方面是为了扫清现代城市发展进程中的思想障碍,探寻适合现代景观环境规划与设计的新理念,使之得以健康的可持续发展。     

国内大型火电机组汽轮机的节能技术方向

基于安徽省内很多大型汽轮机的节能工作经验和对国内大机组节能工作现状的分析，提出目前的大型汽轮机节能的主要问题和技术要点，和节能工作分几步走的思想，以便在今后的节能工作中，立项更合理，并达到投入少，见效快，收益大的效果。     

基于环境选择和配对选择的多目标粒子群算法

为了使多目标粒子群算法中种群粒子能够快速地收敛于怕累托最优边界,针对标准多目标粒子群算法中缺乏粒子评价标准以及种群个体历史最优值位置和全局最优值位置选择问题,提出了一种基于环境选择和配对选择策略的多目标粒子群算法.该算法在每次迭代时,采用SPEA2中的环境选择和配对选择策略及适应度值计算方法,以此来提高种群粒子之间的信息交换力度,减少标准多目标粒子群算法中大量的随机性,使种群粒子能够更快速地收敛于怕累托最优边界.经典测试函数的仿真实验结果表明,在标准多目标粒子群算法中运用SPEA2的环境选择、配对选择策略和适应度值计算方法,能够使种群粒子更快速地收敛于帕累托最优边界,验证了算法改进的可行性和有效性.     

Comments on "An efficient PML implementation for the ADI-FDTD method"

For original paper see Wang and Teixeira (IEEE Microwave Wireless Comp. Lett., vol.13, p.72-4, 2003 February). In this paper, a more precise way to evaluate the actual performance of the perfectly matched layer (PML) used for the alternating direction implicit finite-difference time-domain (ADI-FDTD) method is presented. It is shown that the intrinsic numerical dispersion error of the ADI-FDTD method must be taken into account when the actual performance of the ADI-PML (as well as the ADI-FDTD method) is evaluated. Most importantly, it is demonstrated that the ADI-PMLs implemented with either the traditional manner or the way proposed in have almost the same level of accuracy when the performance of the ADI-PML is correctly evaluated.