五元域上LCD码的构造

基于最优线性码与射影几何理论,针对不同码长最优码的距离特性,研究了低维五元最优LCD码的构造。首先利用删截等方法构造了较小码长的三维和四维最优线性码以及最优LCD码;其次,借助部分已知矩阵和删截等方法构造了较大码长的三维和四维最优线性码以及最优LCD码;最后,利用已知最优LCD码和特殊码长最优自正交码构造了任意大码长的最优LCD码,完全解决了三维和四维最优LCD码的构造问题。这些LCD码的构造方法对于五元高维最优LCD码以及一般域上最优LCD码的研究具有重要的理论指导意义。     

学龄前和学龄期儿童希氏束以上心动过速性心肌病高危因素分析

目的探讨学龄前和学龄期儿童希氏束以上的心动过速(室上性心动过速)与心动过速性心肌病的相关性及高危因素.方法选取室上性心动过速患儿179例,根据心动过速时心功能状态分为心肌病组23例,非心肌病组156例.分析患儿性别、年龄、发作类型、发作频率、持续时间、心室率与心功能损伤的关系和相关高危因素.结果 179例患儿中心动过速性心肌病23例,其中房室折返性、房室结折返性、无明确分类的心肌病分别为7例、10例、6例.房速所致心动过速性心肌病发生率为25.00%(8/32),明显高于阵发性室上性心动过速所致的心肌病发生率10.20%(15/147),差异具有统计学意义(P0.05).心肌病组患儿中房速所占比例、发作持续时间明显高于非心肌病组患儿,发作频率明显低于非心肌病组患儿,差异均具有统计学意义(P0.05).二元Logistic回归分析显示:发作持续时间是心动过速性心肌病的独立影响因素.结论学龄前和学龄期儿童室上性心动过速所致心动过速性心肌病的发生率为12.85%,其中房速所致的心肌病发生率明显高于阵发性室上性心动过速,发作持续时间是唯一高危因素.     

黑果腺肋花楸组培繁殖培养基筛选

以黑果腺肋花楸茎尖和嫩叶为外植体,在MS培养基中加入不同种类与用量的生长调节剂,筛选黑果腺肋花楸组织培养繁殖培养基.结果表明:黑果腺肋花楸愈伤组织诱导效果较好的培养基为MS+6-BA 3.0 mg/L+NAA 0.5 mg/L;不定芽诱导效果较好的培养基为MS+6-BA 1.0 mg/L+NAA 0.1 mg/L;不定根诱导效果较好的培养基为1/2 MS+IBA 0.05 mg/L;以泥炭土、松针、砂砾(2∶1∶1)为基质时,组培苗移栽成活率较高(成活率96%).     

4株水果采后链格孢属真菌的rDNA ITS区序列与碳源代谢指纹图谱差异性分析

从采后贮藏过程中发病的冬枣、樱桃、杏及蓝莓果实中分离到4株丝状病原真菌231#、320#、322#和333#。由形态学特征观察可确定4株病原菌均为链格孢属真菌(Alternaria Nees),rDNA ITS区序列进化树分析结果表明樱桃320#和杏322#与A. alternata (AY625056.1)处于同一分枝,置信度达100%;而蓝莓333#与A. tenuissima (KP324980.1)处于同一分枝,冬枣231#与蓝莓333#和A. tenuissima (KP324980.1)的亲缘性很近,在同一分支上的置信度达100%。对95种碳源的代谢指纹图谱分析的结果表明,4株链格孢属真菌对吐温80、N-乙酰-D-葡萄糖胺、N-乙酰-β-D-甘露糖胺等86种碳源的代谢特征相同,包括78种最适碳源和8种不可利用碳源,其中冬枣231#与A. alternata (Fr.) Keissl的代谢指纹图谱最为相近。4株链格孢属真菌的ITS区序列系统进化树分类与碳源代谢聚类分析结果存在一定差异。     

食品中常见甜味剂使用方面存在的主要问题及危害

甜味剂是现代食品生产加工业不可缺少的一类重要的食品添加剂,可应用于多种食品中。尽管我国食品添加剂的安全标准和监管体系不断发展,但由于甜味剂产业发展较快,一些企业生产者盲目逐利,在生产加工过程仍然存在着不同程度违规使用甜味剂的问题,主要包括超范围和超限量使用甜味剂、滥用复合甜味剂、重复使用甜味剂、标识不符合规定、甜味剂质量不合格和用甜味剂掩盖食品的质量缺陷或以掺杂、掺假、伪造而使用等。食品生产者应合理规范生产和使用甜味剂,以免对消费者身体健康造成危害。消费者也应理性认识甜味剂,从正规渠道购买食品,合理膳食,均衡营养。     

Shear-thickening behavior of Fe-ZSM5 zeolite slurry and its removal with alumina/boehmites

A cryogenic scanning electron microscopy (cryo-SEM) technique was used to explore the shear-thickening behavior of Fe-ZSM5 zeolite pastes and to discover its underlying mechanism. Bare Fe-ZSM5 zeolite samples were found to contain agglomerations, which may break the flow of the pastes and cause shear-thickening behaviors. However, the shear-thickening behaviors can be eliminated by the addition of halloysite and various boehmites because of improved particle packing. Furthermore, compared with pure Fe-ZSM5 zeolite samples and its composite samples with halloysite, the samples with boehmite (Pural SB or Disperal) additions exhibited network structures in their cryo-SEM images; these structures could facilitate the storage and release of flow water, smooth paste flow, and avoid shear-thickening. By contrast, another boehmite (Versal 250) formed agglomerations rather than network structures after being added to the Fe-ZSM5 zeolite paste and resulted in shear-thickening behavior. Consequently, the results suggest that these network structures play key roles in eliminating the shear-thickening behavior.     

Crystallographic texture and earing behavior analysis for different second cold reductions of double-reduction tinplate

Since the production of tinplate with non-earing properties is difficult, especially when it is produced via the double-reduction process, the optimal degree of second cold reduction is particularly important for achieving desirable drawing properties. The evolution of texture and the earing propensity of double-reduction tinplate with different extents of second reduction were investigated in this study. Optical microscopy and scanning electron microscopy were used to observe the changes in the microstructure at various extents of reduction. Two common testing methods, X-ray diffraction (XRD) and electron backscatter diffraction, were used to investigate the texture of the specimens, which revealed the effects of deformation percentage on the final texture development and the change in the grain boundary. The earing rate was determined via earing tests involving measurement of the height of any ear. The results obtained from both XRD analyses and earing tests revealed the same ideal value for the second cold reduction on the basis of the relationship between crystallographic texture and the degree of earing.     

分级多孔纳米炭纤维的结构及电容性能

以酚醛树脂为碳源、PVP为纺丝助剂、纳米MgO颗粒为模板剂,通过静电纺丝法制得酚醛树脂基纳米炭纤维,经过炭化、KOH活化、酸洗后得到分级多孔纳米炭纤维,利用SEM、XRD、XPS、拉曼光谱仪及氮气吸脱附实验,对所制多孔纳米炭纤维的结构和形貌进行表征,并将其作为模拟电容器的电极,利用循环伏安、恒电流充放电及交流阻抗方法测试了材料的电化学性能。结果表明,KOH活化引入了数量可观的微孔,所得纳米炭纤维表现出明显的"微孔-中孔-大孔"分级孔分布的特点,其比表面积达到1058.4m~2/g,总孔容为1.64cm~3/g。电化学测试结果表明,所制分级多孔纳米炭纤维在6mol/L KOH电解液中显示出优异的电容性能,在0.2A/g的电流密度下,其放电比容量达到198F/g,在20A/g电流密度下,电容保持率达到65%。     

Microstructure and corrosion behavior of Al<Subscript>3</Subscript>Ti/ADC12 composite modified with Sr

In this study, we investigated the effect of the addition of Sr (0wt%, 0.1wt%, 0.2wt%, and 0.3wt%) on the microstructure and corrosion behavior of Al₃Ti/ADC12 composite by optical microscopy, X-ray diffraction, scanning electron microscopy, and energy diffraction spectroscopy. The results reveal that the α-Al phases were nearly spherical and 40 μm in size and that the eutectic Si phases became round in the composite when the Sr content reached 0.2wt%. The Al₃Ti particles were distributed uniformly at the grain boundary. The results of the corrosion examination reveal that the Al₃Ti/ADC12 composite exhibited a minimum corrosion rate of 0.081 g·m–2·h–1 for an Sr content of 0.2wt%, which is two thirds of that of unmodified composite (0.134 g·m–2·h–1). This improved corrosion resistance was due to galvanic corrosion, which resulted from the low area ratio of the cathode to anode regions. This caused a low-density corrosion current in the composite, thereby yielding optimum corrosion resistance.     

空气动力学仿真在摩托车造型开发中的应用

摩托车空气动力学特性对摩托车的动力性、经济性和操作稳定性有直接影响。由于国内没有摩托车专用风洞,道路滑行试验无法适用于所有车型,所以在一款新型巡航车造型开发阶段,采用空气动力学仿真方法分析实车模型的空气动力学特性,在此基础上指导多个部件优化设计,并对优化后提供的两个挡风板安装方案分别进行了整车仿真分析。仿真结果显示,优化后的两方案整车阻力系数Cd值均降低,两挡风板安装方案的空气动力学性能对比为进一步选型提供了参考依据。