A submllimeter observation and study of star-forming regions

Using the 3-m radio telescope of KOSMA, we mapped 12CO (J = 3-2) lines for three molecular clouds, B35, S146 and TMC-2A. High-velocity molecular outflows are found in all these regions. The physical and dynamical parameters of the outflows are derived, and their shapes and driving sources are analyzed. Contour maps of center velocities show that the large scale systematic gradients exist in the three clouds. These observed motions are best explained by rotation after excluding the cause of outflows. Furthermore, in the core region of TMC-2A there is a velocity gradient in opposite direction from that of the large scale. It may be caused by magnetic braking. Finally, angular velocities of the clouds are calculated, and the effects of rotation against gravity and lowering the star-formation rate are also analyzed.     

Orientation of the peptide formation of N-phosphoryl amino acids in solution

The peptide formation of N-phosphoryl amino acids with amino acids proceeds in aqueous solution without any coupling reagents. After being separated in sephadex gel column, the phosphoryl dipeptides were analyzed by the electrospray ionization tandem mass spectrometry (ESIMS/ MS). The result demonstrates that phosphoryl dipeptides were detected in all the reaction systems. It is found that the formation of N-phosphoryl dipeptides is oriented: the N-terminal amino acid residues of the N-phosphoryl dipeptides are from N-phosphoryl amino acids, and the peptide elongation happened at the C-terminal. Only a-dipeptide, no b-dipeptide, is formed in the N-phosphoryl dipeptides, showing that a-carboxylic group is activated selectively by N-phosphorylation. Theoretical calculation shows that the peptide formation of N-phosphoryl amino acids might happen through a penta-coordinate carboxylic-phosphoric intermediate in solution. These results might give some clues to the study on the origin of proteins and protein biosynthesis.     

论党的民主集中制的形成和发展

党的民主集中制从形成到发展经历了80年的历程。这80年间,党的民主集中制经历了四个时期。本文探讨了这四个时期党的民主集中制发展变化的情况,并简要分析了民主集中制与党的发展壮大之间的关系,以及它在发展中的规律和特点。     

Optimal Taxation in an Endogenous Growth Model with Multiple Levels of Governments

This paper presents a framework with federal income tax, federal transfer, and local taxes in an dynamic growth model with multiple levels of governments and public capital formation. It derives the rate of endogenous growth and, with both simulations and special examples, examines how the rate of endogenous growth changes with respect to federal income tax, local taxes, and federal transfers.     

科技档案形成规律初探——科技档案本体论研究之一

科技档案的形成规律是科技档案现象、运动诸规律当中最基本的规律 ,一直以来对科技档案的形成规律有着不同的理解和论述。它涉及现行科技文件的积累、整理、归档直到完成向科技档案转化等活动过程 ,包括对象律、程序律、成套律、转化律和动态律等五个方面内容。     

石油射孔弹聚能效应的三维数值分析

建立某型号石油射孔弹的三维有限元模型,运用LS-DYNA对射孔弹装药起爆后,炸药爆轰及射流的形成、延续和断裂过程做了详细的模拟分析,得到了全过程射流压力、速度等参数的变化情况. 结果显示,本型号射孔弹射流完全形成历时33.997 μs,此时间段内,每时刻药型罩材料上的最大压力处是射流形成的源头;在射流最大压力值开始衰减后,射流的最大速度也不再增加;射流断裂的主要原因是射流速度梯度的存在导致射流微元之间产生了相对位移.     

纳米La3+/TiO2光性能的研究

采用溶胶-凝胶法制备出了不同La3+掺杂量、不同煅烧温度的La3+/TiO2的光催化剂,并对所制得的光催化剂进行了SEM、XRD、FT-IR表征;以亚甲基蓝为目标降解物进行光催化活性研究.结果表明,所得粉体为锐钛矿相纳米TiO2,且La3+掺杂后,纳米TiO2特征衍射峰宽化,强度降低,说明稀土La3+的掺杂能细化晶粒,稀土离子掺杂也有利于抑制高温时的TiO2晶型由锐钛矿向金红石型的转变;以亚甲基蓝为目标降解物的光催化实验表明,在500℃煅烧,含量0.5%La3+/TiO2的催化剂,加入2mL助催化剂,提供了光催化基元反应的中间介质羟基自由基,使基元反应中的活化能降低,反应更易进行,在三基色节能灯照射3.0h,降解率可77.56%,时间短见效快.     

基于简化差分插值滤波的编队卫星相对导航

将一种基于Stirling内插公式的非线性差分插值滤波(Divided Difference Filter-DDF)算法的简化形式(Simplified Divided Difference Filter-SDDF)应用到编队卫星相对导航中.该算法通过对非线性系统方程进行多项式展开并取有限差分插值项进行近似.数值仿真结果表明:该算法相对于EKF(Extended Kalman Filter)算法有明显的优势,有较高的滤波精度、更快的收敛速度和较好的稳定性,其中相对位置估计相比EKF提高79%、相对速度提高52%,对编队卫星相对导航具有一定应用价值.     

松辽盆地两井孤店地区泉头组四段沉积微相研究

从区域地质背景出发,通过岩芯观察、粒度分析、重矿物以及测井曲线形态等资料的综合分析表明,两井孤店地区泉头组四段主要为三角洲前缘-滨浅湖沉积体系,来自东南和西南的两大水系同时对该区供应沉积物源.三角洲水下平原主要发育水下分流河道、水下分流间湾、水下分流河道侧翼等沉积微相;前缘部位发育河口坝、坝间、远砂坝、席状砂等,水下分流河道是本区占主导地位的骨架砂体.首次指出了该区泉四段不同时期各相带的空间组合及分布特征,为本区泉四段今后的油气勘探和开发提供了依据.     

营养缓释型生物填料的制备及在废水处理中的应用

 针对有毒抗（难）降解芳香族污染物生物处理时挂膜启动慢、降解速率低的缺陷,在新研制的营养缓释型填料中,添加该类污染物降解时微生物共代谢所需的一级基质,并加入活性炭、蔗渣作为控释剂形成营养缓释型改性填料,研究了所得改性填料的表面结构、营养缓释性能、挂膜及降解性能。结果表明,改性聚乙烯填料表面粗糙多孔,具有良好的营养缓释性能;同时,其微生物挂膜速率明显加快,挂膜所需时间缩短了3 d;在初始浓度为127mg/L的苯酚降解实验中,苯酚降解速率明显快于传统聚乙烯填料,在降解后的第8小时,改性填料苯酚去除率高达91.7%,比传统聚乙烯填料提高37.7%,脱氢酶活性更是普通填料的2倍以上。