New multitarget constant modulus array for CDMA systems

1 .INTRODUCTIONThe constant modulus algorithm(CMA) is a veryeffective blind approach to remove multiple accessinterference ( MAI) . Recently ,the CMA has beenapplied to the direct-sequence code division multi-ple access (DS-CDMA) systems with array anten-nas , which has tremendous potential to increasethe cellular system capacity . But the CMA algo-rithm lacks signal-selectivity and may capture aninterference instead of the desired user .Pre-sprea-dingis an effective method to alle…     

Jurassic-Cretaceous boundary in northeastern China: placement based on buchiid bivalves and dinoflagellate cysts

Global environments changed greatly during the Late Jurassic and Early Cretaceous, particularly during the Jurassic-Cretaceous boundary interval. Separation of the world into Tethyan, Boreal and other biogeographic realms complicates international correlation, and even the pelagic ammonites cannot play their characteristic role of principle correlation criteria. In the Boreal and North Pacific realms, the Late Jurassic and Cretaceous buchiid bivalve zones have very good calibration to Boreal ammonite zones, which, in turn, have approximate correlations to Tethyan ammonite zones. Therefore, buchiid bivalves provide a means to identify Upper Jurassic-Lower Cretaceous stages and the Jurassic-Cretaceous boundary interval. The base of the Buchia unschensis Zone is roughly coincident with the Boreal ammonite Craspedites exoticus subzone, Upper Volgian Craspedites okensis Zone, which in turn closely corresponds to the base of the Tethyan ammonite basal Berriasian Berriasella jacobi Zone. The top of the underlying Buchia russiensis Zone approximately coincides with that of the uppermost Middle Volgian, Boreal ammonite Epivirgatites variabilis Zone, which approximately corresponds to the Tethyan ammonite Durangites Zone of uppermost Tithonian. Buchia and dinoflagellate cyst assemblages from two regions in eastern Heilongjiang of northeastern China indicate the presence of the Jurassic-Cretaceous boundary interval. The Dong’anzhen Formation of Dong’an, Raohe County contains Middle Volgian-Lower Valanginian Buchia assemblages and the Jurassic-Cretaceous boundary is tentatively assigned to either the base of the Buchia fischeriana-Buchia unschensis assemblage or between the Buchia fischeriana-Buchia unschensis and Buchia russiensis-Buchia fischeriana assemblages. The Dongrong Formation from boreholes at Suibin, Suibin County, yields uppermost Oxfordian to basal Berriasian Buchia assemblages and Oxfordian-Barremian dinoflagellate cyst assemblages. Here, the Jurassic-Cretaceous boundary interval is probably between the Buchia cf. mosquensis-Buchia cf. rugosa assemblage (including Buchia ex gr. russiensis and Buchia ex gr. taimyrensis) and the overlying non-Buchia-bearing deposits.     

蟋蟀下行脑神经元形态与功能的研究进展

蟋蟀下行脑神经元通过围咽神经索将编译、整合的信息传递到腹、胸等神经节的运动中枢,约占脑神经元总量的0.3‰~1.5‰,并能高效的聚集信息.传递触角感觉信息的下行脑神经元分支多聚集在中脑;外界刺激信息通过下行脑神经元传递到运动中枢支配行走,同时不断接收听觉、视觉信息调整行走的速度和方向.研究下行脑神经元的形态结构与功能将为研究昆虫微小脑的控制原理提供重要的理论依据.     

30MnSiV钢变形阻力的实验研究

以Gleeble-1500热模拟实验机得到的实验数据为基础，研究了30MnSiV在900－1500℃热变形过程中，变形阻力与变形温度，变形程度和应变速率之间的关系，通过非线性回归法得到30MnSiV钢变形阻力的数学模型，并与现场实测值进行了分析比较。     

《光电传感与检测》课程教学的改革与实践

对<光电传感与检测>课程的教学内容和教学方法中存在的问题进行了分析,通过制定新教学大纲、编著新教材、设计基于项目设计的实验内容、引入讨论原理性方案式教学和基于项目设计的实验教学方法,使课程教学贴近产业发展并反映当代光电高新技术的实际应用.实践证明:该方法既可激发技术应用型专业学生的学习兴趣,又可增强他们分析和解决工程实际问题的能力.     

"中国式"电炉炼钢流程碳排放特点及其源解析

电炉炼钢流程，因其注入过多铁水在中国并未发挥减碳作用，本文称其为“中国式”电炉炼钢流程.对此，本文在建立研究边界的基础上，结合排放因子法，构建了“中国式”电炉炼钢流程的碳排放桑基图，探寻碳排放的路径.结果显示:采用“中国式”电炉炼钢，吨钢CO₂排放量为3.070t.其中，电炉炼钢工序CO₂排放量最大，为1.400t.特别地，代替废钢加入铁水导致CO₂排放1.419t.分析发现:中国钢铁企业处于成长期，废钢指数小，废钢资源不足;废钢回收利用系统不完善;工业用电价格高.这些因素造成电炉炼钢流程采用了过多的铁水进行冶炼.     

昆虫尾须感受器种类特征及其生理功能

尾须是昆虫重要的感觉器官,它与昆虫触角类似,表面分布着许多不同类型的感觉毛,这些感觉毛特化成各种类型的感受器,具有感觉外界环境变化的功能,在昆虫的繁殖、身体平衡等生命活动中起到非常重要的作用.根据尾须感受器形态大小及特征的分类研究,其感受器主要可分为丝毛形感受器、钟形感受器、矛形感受器、毛形感受器、刺形感受器、棒状感受...     

秋水仙素诱导秋花独蒜兰多倍化的研究

以秋花独蒜兰(Pleione maculata Lindl.)拟原球茎为材料,研究不同浓度及时间条件下,对秋水仙素诱导秋花独蒜兰多倍化的诱变效果.实验结果表明:秋水仙素浓度为0.2%、处理时间为60 h时,诱导结果最佳,变异率为25.64%;细胞学鉴定表明,该方法诱导培育的植株具有多倍体表型特征,其体细胞染色体数多为2n=76～80条,而对照2n=38～40条.     

移动、固定两用灭火系统在电缆隧道和电缆夹层中的应用

随着工业、企业用电量的增加以及工业自动化水平的提高,电缆隧道和电缆夹层中电缆用量也在随之不断增加.电缆隧道和电缆夹层是工业、企业布设光缆、动力电缆、控制电缆的专用通道,若电缆隧道和电缆夹层一旦发生火灾,将会导致大量电缆迅速蔓延燃烧,造成企业设备停运、停产、财产严重损失等严重后果.     

重组谷氨酰胺转胺酶基因的原核表达研究

采用基因重组手段构建了含重组谷氨酰胺转胺酶基因的菌株E.coli BL21/pET30α-MTG(DE3).研究了诱导剂浓度、诱导时间、温度和转数等对重组体表达的影响,确定了融合蛋白pET30α-MTG的最佳表达条件. 结果表明:当摇菌转速250 r/min,IPTG终浓度1.0 mmol/L,温度37 ℃时,诱导培养4 h可得最大表达量.