不同海拔高度对玉米自交系生育的影响研究

通过对豫西山区不同海拔高度的气候条件与玉米自交系的生育进程、植株形态和产量性状的观察 ,找出了适合于玉米制种的地带和适宜的玉米自交系。     

专利制度激励技术创新的宏观机制

随着世界经济技术一体化的加快、我国加入WTO后融入国际经济的加深与技术贸易的飞速发展 ,对专利制度的经济学理解是非常迫切和必要的。本文在前人的基础上 ,指出专利制度(核心为专利法 )宏观上是从地域、知识、结构三个维度对技术创新进行激励的。     

50kW静音型电源车车厢降噪设计与试验分析

针对50 kW电源车噪声较高的问题,测量并分析了车厢内柴油发电机组的噪声频谱特性,将电源车车厢结构设计成了由操作舱、机组舱和消声舱组成的封闭式三舱结构。通过设计进排气消声器对进排气噪声进行控制。车厢各舱内壁设计了吸声隔声结构来控制各舱内噪声。消声舱内设计了三角形吸声立柱对机组舱传出的风扇噪声、振动噪声和其他各类噪声消声。通过试验测试发现,柴油发电机组安装于静音型电源车车厢后,噪声下降了25~30 dB,使得整车噪声75 dB。所设计噪声控制方案可以满足电源车噪声控制的要求。     

溶胶-凝胶法合成Y（BO3，PO4）：Ce，Tb荧光粉及其荧光性能的研究

采用溶胶-凝胶法合成Y（BO3,PO4）：Ce,Tb绿色荧光粉,利用热分析（TG—DTA）、X射线衍射仪（XRD）、扫描电子显微镜（SEM）、荧光分光光度计等手段探讨了（BO3,PO4）：Ce,Tb荧光粉的烧结条件、结构及荧光性能的关系．实验结果表明,烧结温度对产物的结构和荧光性能具有一定影响,在1050℃下、高温烧结2h的样品的荧光强度最好．与高温固相法相比,此法合成的（BO3,PO4）：Ce,Tb荧光粉具有较完善的晶体结构,较高的纯度,较小的颗粒尺寸,粒度分布均匀,且相对荧光强度更高．     

在偏序集上单调函数的一些性质

给出单调函数在偏序集上的一些性质,并给予证明.同时,将全序集上的单调函数与偏序关系中的单调函数进行了比较.     

级联双稳随机共振降噪下的经验模式分解

针对强噪声背景下混合信号的经验模式分解（EMD）问题,提出了一种基于级联双稳随机共振系统（CBSRS）降噪的EMD方法。该方法利用CBSRS对时域波形降噪的优良特性,首先对有噪信号进行随机共振输出,信号得到降噪后,再进行EMD。在仿真实验中,分别对原始信号以及各级级联随机共振输出后的信号进行EMD,对比结果表明,级联双稳系统能有效去除高频噪声,减少EMD的层数,使EMD具有更明确的物理意义最后通过一个轴承外圈故障的诊断实例表明,该方法在逐步滤除高频干扰的同时,不断加强低频特征能量,可以有效检测出故障的特征频率。     

Fossil Orangutan-like hominoid teeth from Late Pleistocene human site of Mulanshan cave in Chongzuo of Guangxi and implications on taxonomy and evolution of orangutan

Fossil records indicate orangutan-like hominoids have been widely distributed in south China during Pleistocene, although currently only surviving in the tropical forests of Kalimantan and Sumatra in Indonesia. This paper describes the recently discovered hominoid fossil teeth from human site of Mulanshan cave in Chongzuo of Guangxi, whose geological age is the Late Pleistocene, about 11000 yeas age based on associated mammal fauna and U-series dating. Compared with those of modern and subfossil orangutans from Indonesia, other fossil great apes from China, the hominoid teeth from Mulanshan cave are orangutan-like, but show somehow different from Indonesia＇s orangutans, the average sizes of cheek teeth larger and occlusal enamel wrinkles less and simpler. They are classified temporarily as the subspecies of Pongo pygmaeus weidenreichi. Concerning the variations of morphological features and dental sizes of orangutan-like teeth from southern China and neighboring northern Vietnam, different subspecies or species or genus possibly, but the key evidence is necessary to be identified.     

Study on the photosynthetic performances of Enteromorpha prolifera collected from the surface and bottom of the sea of Qingdao sea area

In this work, the photosynthetic performances of Enteromorpha prolifera thalli collected from the surface and bottom of the sea of Qingdao sea area were studied with chlorophyll fluorescence and oxygraph technology. The samples with the highest photosynthetic activity among their kinds, the floating thalli from the sea surface of the south of the Qingdao Olympic Sailing Center and the sedimentary thalli from the mud surface of the bottom Tuandao bay, were chosen as representatives of surface thalli and bottom thalli, respectively. The results showed that the maximal PSII quantum yield of the floating thalli was significantly lower than the normal level although their photosynthetic activities were relatively high; the photosynthetic potential of the thalli form the mud surface was extremely low. Thus, it is indicated that the floating thalli are seriously stressed by their environment and the thalli from the mud surface are already dead or are dying. On the other hand, the results of the laboratory cultivation showed that the sedimentary thalli cannot regain normal photosynthetic activity even under normal illumination conditions. Thus, the thalli from the mud surface cannot become reproductive source of the alga even if they can reach sea surface again. Therefore, a preliminary conclusion can be reached that, up to mid-July 2008, the environmental conditions of the Qingdao sea area are not suitable for the growth of the alga E. prolifera and for this reason the biomass of E. prolifera, in the area, could be declining. Supported by National Natural Science Foundation of China (Grant No. 30830015), Key Projects in the National Science & Technology Pillar Program in the Eleventh Five-year Plan Period (Grant No. 2006BAD09A04) and National High Technology Research and Development Program of China (Grant Nos. 2006AA10A402, 2007AA09Z406, 2006AA05Z112, 2006AA10A413)     

一种改进MIMO-MC-CDMA系统资源分配算法

提出一种应用于多输入多输出MC-CDMA系统的功率、子带、码道自适应分配算法。发送端在总发射功率受限的条件下通过多用户间功率、子带和码道的分配最大化系统吞吐量。通过限制用户的最大码道数来实现用户之间的带宽公平性。和传统MC－CDMA系统资源分配算法比较,本算法的最大特点是综合考虑功率、子带、码道的三维优化。算法最终归结为一个约束优化问题并利用拉格朗日乘子法进行求解。计算机仿真验证了算法的有效性。     

丝状真菌米曲霉外源基因表达系统的构建

以米曲霉Aspergillus oryzae RIB40的基因组DNA为模板,PCR扩增得到启动子、终止子、筛选标记基因等表达元件,依次连接到载体pUC119上,构建了米曲霉的重组表达载体pNMA. 将米赫根毛霉脂肪酶基因(RML)连接于pNMA的启动子下,得到表达载体pNMA-RML,通过ApaI酶切线性化转化米曲霉宿主菌A.oryzae niaD300,得到整合型的阳性转化子A.oryzae ONL1. 其培养7天的培养液上清在以三丁酸甘油酯为底物的平板上形成清晰的水解透明圈,碱滴定法酶活测定表明培养液酶活可达2.5 U/mL,培养液上清的SDS-PAGE图谱在32.5 kDa处有RML的特征条带. 以上结果表明RML已经在米曲霉中成功表达,同时证明所构建的米曲霉外源基因表达系统是有效的.