Synthesis of Dendronized Aromatic Polyamides with Chloromethyl Groups in the Periphery by Macromonomer Approach

The preliminary results for one-pot synthesis of dendronized aromatic polyamides with chloromethyl groups in the periphery by macromonomer approach were reported first time. The GPC analysis of the resulting dendronized polymers has shown typical weight average molecular weight (Mw) of 41554 and a polydispersity of 2.74.     

广义Lienard方程边值问题

By coincidence degree,the existence of solution to the boundary value problem of a generalized Liénard equation a(t)x＂+F(x,x′)x′+g(x)=e(t),x(0)=x(2π),x′(0)=x′(2π)is proved,where a∈C1[0,2π],a(t)>0(0≤t≤2π),a(0)=a(2π),F(x,y)=f(x)+α| y|β,α>0,β>0 are all constants,f∈C(R,R),e∈C[0,2π]. An example is given as an application.     

相对论磁控管的实验研究

简要分析了相３对论磁控管的主要特点与问题，编制了谐振系统数值计算程序，通过数值计算与冷测，对不同阴极尺寸与输出结构的磁控管进行了研究，清晰地描述了磁控管的振荡模式与简并现象。制作了Ａ６型相对论磁控管并进行了热测实验，研究了输出功率与工作磁场的关系，经过大量优化工作，在Ｓ波段获得了３８０ＭＷ的微波辐射。     

Aerosol Charge Neutralization by a Radioactive Alpha Source

The performance of a Po-210 radioactive ionizer for aerosol charge neutralization and bipolar charging has been evaluated. Monodisperse neutral and singly charged aerosols have been passed through the ionizer and their approach to the steady-state Boltzmann charge measured by measuring the fraction of particles that are electrically charged. The result shows that an Nt of approximately 2.5 × 10⁵ cm^?3 s is needed for the development of a steady-state charge fraction equal to that given by the Boltzmann' s law where N is the ion concentration and t is the residence time of the aerosol in the neutralizer. In addition, the performance of the ionizer for particle charge neutralization in a vibrating-orifice aerosol generator has been evaluated and the result shows that the source is less effective for this application and the residual charge on the particles is considerably higher than that given by the Boltzmann's law.     

空间光强自动测试装置的研究

通过对灯具空间光强测试方法的研究，提出了一种空间光强测试新方法。建立了灯具空间光强自动对中的数据模型，介绍了空间光强自动测试装置的组成和测试原理。借助二维扫描系统和专用测试软件绘制出空间光强的三维图形，从而可快速求出灯具x和y轴的光强分布曲线以及发散角，故而可获得所需的测试信息，并可通过全过程测试得到更加丰富的测试信息及测试报告。最后给出将一投影灯置于离探测器5m处的测试结果，按文中所述测试原理测得的峰值光强为2634.4cd，发散角为15.25°。     

一维p-拉普拉斯三个正解的存在性

考虑边值问题:(p(x'(t)))'+q(t)f(t,x(t),x'(t))=0,P>1,t∈[0,1],边值条件为x(0)=x(1)=0或x(0)=x'(1)=0．借助于一个新的不动点定理我们获得了存在至少三个正解的充分条件．问题的关键是非线性项f依赖于未知函数的一阶导数．最后,给出一个具体的例子．     

D(β)-vertex-distinguishing total coloring of graphs

A new concept of the D(β)-vertex-distinguishing total coloring of graphs, i.e., the proper total coloring such that any two vertices whose distance is not larger than β have different color sets, where the color set of a vertex is the set composed of all colors of the vertex and the edges incident to it, is proposed in this paper. The D(2)-vertex-distinguishing total colorings of some special graphs are discussed, meanwhile, a conjecture and an open problem are presented.     

Synthesis of enantiomerically pure functionalised trianglamine macrocycles by N-acylation and N-alkylation reactions

The N-alkylation and N-acylation reactions of trianglamine macrocycles are described leading to an efficient synthesis of enantiomerically pure functionalised hexa-amide and hexa-amine trianglamine macrocycles.     

Finite-time disturbance observer-based trajectory tracking control for quadrotor unmanned aerial vehicle with obstacle avoidance

This paper investigates the problem of trajectory tracking control for quadrotor unmanned aerial vehicle (UAV) in the presence of dynamic obstacles and external disturbance forces/torques. More specifically, two new sliding mode disturbance observers are firstly designed to estimate the external disturbances, in which the observation errors can converge to zero in finite time. Furthermore, utilizing the observation information, a new sliding mode surface-like variable-based position tracking control scheme and a novel nonsingular terminal sliding mode-based attitude synchronization control scheme are developed to drive the UAV tracking the reference trajectory with obstacle avoiding. Moreover, the tracking errors of the close-loop control system can converge to zero within finite time by the analyses of Lyapunov methodology. Finally, the numerical simulation results are presented to illustrate the effectiveness of the proposed control schemes.     

基于连续光谱法联合测定NH3-N、COD方法研究

针对地表水中Ⅰ—Ⅴ类水域、地下水、工业废水对氨氮及化学需氧量准确快速联合测定的需求,融合光谱分析法中的连续光谱法与顺序注射技术（SIA）,基于地表水国家检测标准,以氨态氮（NH₃-N）、化学需氧量（COD）原位水质参数为检测对象,设计了一种小型微量原位水质NH₃-N、COD高效快速检测仪。该系统主要依据自主设计的基于紫外灯照射消解与加热密闭消解方法同时进行的消解池结构以及基于光谱扫描设计的的检测池结构,达到快速消解稳定检测的目的。同时系统基于分光光度法优化了检测流程,测定开始COD消解的同时,待检测池中的NH₃-N指数显色后的配位化合物进行光谱扫描测定,消解后,进行COD的测定,整个检测过程相比国标检测法缩短至少60 min,可以实现25min内自动完成NH₃-N及COD的测定,大大节约时间成本。绘制经光谱扫描显色反应后配位化合物的吸光度与连续波长曲线可得：NH₃-N、COD分别于690和445 nm处具有明显吸收峰,经读取峰的吸光度值,采用最小二乘法分别建立NH₃-N、COD回归建模,拟合回归方程并计算相关系数,绘制相应参数的吸光度-浓度工作曲线。实验结果表明：在0~2 mg·L-1浓度范围内,NH₃-N标准工作曲线相关系数r≥0.998 7,且浓度与吸光度成正相关。重复性相对标准偏差为1.36%~1.68%,加标回收率为97%~102%;在0~50 mg·L-1浓度范围内,COD标准工作曲线相关系数r≥0.997 8,浓度与吸光度呈负相关。重复性相对标准偏差为2.14%~2.48%,加标回收率为97.6%~102.95%。系统的测定结果准确、直线性与稳定性良好,具有较高的可行性与可靠性。基于SIA与连续光谱法联合测定NH₃-N、COD的方法研究,为拓宽光谱法在水质快速检测领域的应用、提高检测效率等方面的研究具有重大价值。