平面不可压缩的NAVIER-STOKES方程新五模类LORENZ方程组的混沌行为

本文研究了平面正方形区域上不可压缩的Navier-Stokes方程五模类Lorenz方程组的混沌行为问题.利用傅立叶展开方法对Navier-Stokes方程进行模式截断,获得了新五模类Lorenz方程组,给出了该方程组定常解及其稳定性的讨论,证明了该方程组吸引子的存在性,并对其全局稳定性进行了分析和讨论.     

Design and fabrication of computer-generated holograms for testing optical freeform surfaces

Freeform optical surfaces (FOSs) will be the best elements in the design of compact optical systems in the future. However, it is extremely difficult to measure freeform surface with sufficient accuracy, which impedes the development of the freeform surface. The design and fabrication of computer-generated hologram (CGH) , which has been successfully applied to the tests for aspheric surfaces, cannot be directly adopted to test FOSs due to their non-rotational asymmetry. A novel ray tracing planning method combined with successively optimizing even and odd power coefficients of phase polynomials in turn is proposed, which can successfully design a non-rotational asymmetry CGH for the tests of FOSs with an F-θ lens. A new eight-step fabrication process is also presented aiming to solve the problem that the linewidth on the same circle of the CGH for testing freeform surface is not uniform. This problem cannot be solved in the original procedure of CGH fabrication. The test results of the step profiler show that the CGH fabricated in the new procedure meets the requirements.     

CO优先氧化反应MnCu/Ce催化剂的制备及性能

采用共浸渍法制备较低Cu含量的MnCu/Ce催化剂,通过XRD、BET、H₂-TPR、XPS和CO₂-TPD等表征手段对催化剂进行表征,考察催化剂焙烧温度对催化剂结构、性质及其在含有CO₂的富氢气氛下对CO优先氧化性能的影响。结果表明,MnCu/Ce催化剂均有Cu/Mn-O-Ce固溶体形成,其中,在焙烧温度600℃制备的催化剂中,Mn与Cu、Ce之间相互作用较强,形成较多三元氧化物固溶体,氧空位/Ce³⁺含量高,具备良好的CO-Prox活性。此外,对反应条件的考察发现,添加不同分压Ar对催化剂的CO-Prox活性影响较小,气体空速和氧过量系数对催化剂活性影响较大,且反应原料气中CO₂的存在对CO-Prox反应有负面影响。氧过量系数为1.2、空速范围为20266-30400 mL/(g·h)时,CO转化率最高,达到94.7%。     

L-Shell X-Ray Yields and Production Cross Sections of Zr and Mo Bombarded by Slow Highly Charged Ar16+ Ions

The L-shell x-ray yields of Zr and Mo bombarded by slow Ar16＋ ions are measured. The energy of the Ar^16＋ ions ranges from about 150 keV to 350 keV. The L-shell x-ray production cross sections of Zr and Mo are extracted from these yields data. The explanation of these experimental results is in the framework of the adiabatic direct- ionization and the binding energy modified BEA approximation. We consider, in the slow asymmetric collisions such as Ar and Mo/Zr, the transient united atoms （UA） are formed during the ion-surface interaction and the direct-ionization is the main mechanism for the inner-shell vacancy production. Generally, the theoretical results are in good agreement with the experimental data.     

用于液相中检测的压电免疫传感器研究

利用聚乙烯亚胺法,将Ｃ２型葡萄菌肠毒素（ＳＥ）抗体固化在未抛光的压电晶体的金电极上,利用双调式振荡电路制作的振荡器,构建压电免疫传感器,其稳定性,特异性都较好。     

固体分层取样方案的最优化设计

本文首次从理论上探讨了取得量对分层取样误差的影响,提出了总取样量一定时各层的最佳取样量和最小取样方差的计算公式,从而为分层取样的最佳取样方案设计提供了理论依据。     

粒状物质的微观均匀度及其对取样误差的影响分析

研究物质的取样属性与以取样误差之间的关系是分析化学取样学的重要内容。从微观角度探讨了物质的理论性质及其对取样误差的影响。以碳化硅为例,考察了粒度分布、组分随粒度的变化以及均匀度因子等,分析了取样误差的来源。首次通过粒度分级成功地对碳化硅进行了分层,并对分层取样和随机取样的误差进行了分析和讨论,为制定合理的取样方案提供了有利的依据。本文的研究方法可适用于所有粒状物质的取样,同时也为分析化学取样学的深     

Pt/HZSM-5催化剂上甲基环戊烷的临氢转化Ⅰ.反应条件对扩环反应的影响

在连续流固定床反应装置上,考察了反应温度、压力及氢烃摩尔比等条件对甲基环戊烷(MCP)临氢转化反应活性及扩环反应选择性的影响;结合反应评价结果和热力学分析,探讨了Pt/HZSM-5催化作用下MCP的扩环反应规律.MCP临氢转化发生三类反应:扩环(RE)、开环(RO)和裂解(CR),其中扩环反应生成环己烷(CH)和苯(Bz).结果表明,随温度的升高或氢烃比的降低,MCP的转化率增大,而提高反应压力不利于MCP的转化.扩环反应选择性呈现复杂的变化规律,随温度的升高,扩环反应选择性先增加而后逐渐降低,即存在极大值.氢烃比的影响与温度密切相关,在低温区时扩环反应的选择性随氢烃比的降低而降低,而在高温区时的影响很小.提高反应压力,对扩环反应不利.扩环产物Bz和CH的分布为MCP扩环反应的反应历程提供了信息,临氢反应的Bz/CH实验值大于理论平衡值的结果表明,与CH相同,Bz也是MCP临氢转化的一次产物.在此基础上提出了修正的MCP扩环反应历程,MCP在双功能催化剂作用下形成的中间体吸附物种,通过两条平行反应路径分别生成CH和Bz,即异构化反应和异构脱氢反应是平行反应.同时,在本催化反应体系下,Bz还可以由CH脱氢而来.     

Multiple ionization of argon accompanied by electron loss and capture of 0.22-6.35 MeV C^q＋ ions

In this paper a projectile ions recoil ions coincidence technique is employed to investigate the target ionization and projectile charge state changing processes in the collision of 0.22-6.35 MeV Cq^＋ （q = 1 - 4） ions with argon atoms. The partial cross section ratios of the double, triple, quadruplicate ionization to the single ionization （or the single capture） of argon associated with single electron loss （or single electron capture） by the projectile are measured and compared with the previous experimental results. In the present experiment, it is observed that the ratios of ionization cross sections R associated with single loss and single capture depend strongly on the projectile charge state and vary significantly with different reaction channels as impact energy increases. In addition, this paper gets empirical scaling laws for the ionization cross section ratios R corresponding to the projectile single loss and finds that the ratios of the double ionization to the single ionization associated with single electron capture remain constant in the present energy range.     

添加剂和溶剂退火协同优化制备高性能厚膜有机太阳能电池

通过溶剂添加剂1-氯萘(CN)和二硫化碳(CS₂)溶剂退火(SVA)协同优化了基于窄带隙小分子受体的厚膜活性层形貌,揭示了该策略对共混膜形貌的调控机理,研究了其对活性层中的载流子动力学以及器件光伏性能的影响.结果表明,CN添加剂可以有效促进受体材料结晶聚集,CS₂溶剂退火能够进一步提升活性层材料分子堆积的有序性,同时优化给受体材料相分离尺寸,降低共混膜表面的粗糙度,实现了良好的纳米尺寸相分离形貌.基于CN+SVA处理的PM6∶Y6厚膜(300 nm)器件的电荷传输和复合性质得到改善,取得了15.23%的光电转换效率(PCE),显著高于未经处理(PCE=11.75%)和仅用CN处理(PCE=13.48%)的光伏器件.该策略具有良好的适用性,将基于PTQ10∶m-BTP-PhC6器件的光伏性能从13.22%提升至16.92%.