解析函数在本性奇点的一些研究

用正规族理论,研究解析函数在本性奇点附近性质,得到解析函数及其导数在孤立本性奇点附近的一些结果.     

1310nm波段石英晶体旋光性的温度效应测试研究

为了测试温度对1310nm波段石英晶体旋光性的影响,采用高低温试验箱作为温控器,设计了双光路检测系统对石英晶体在1310nm波段旋光性的温度效应进行测试研究。实验结果表明,在-10～20℃温度范围内,对于确定波长的光,随温度的升高,石英晶体的旋光率增大;在25～50℃温度范围内,随温度的升高旋光率减小;对于同一温度,波长越长旋光率越小。根据测试结果求解Sellmeier方程得出了Sellmeier方程的常数与温度的关系式,从而可以得出任意温度下不同波长对应的石英晶体的旋光率。     

泡腾辅助微萃取技术的开发与应用研究进展

泡腾辅助微萃取(EAM)技术是一种利用CO₂供体和H⁺供体反应产生CO₂气泡促进萃取剂快速分散、增大与目标物的接触面积，以实现高效萃取的新型样品预处理手段。该技术具有分散速率快、萃取效率高、使用成本低、应用范围广等优点。得益于萃取剂的快速发展，泡腾辅助微萃取方法的构建和应用范围研究日趋完善和多样，已广泛用于环境、食品、生物等样品的前处理领域。该前处理技术结合各类检测仪器构建新型快速的检测方法，成功实现了重金属离子、农药、内分泌干扰物、抗生素等污染物的检测。在EAM技术的构建中，常考查泡腾片剂的组成、溶液pH、萃取温度、萃取剂种类、萃取剂添加量、洗脱剂种类、洗脱剂体积、洗脱时间、循环使用次数等因素对方法的影响，重点依据线性范围、相关系数、富集因子、检出限、定量限等参数对方法进行评判，最后结合各类仪器检测方法，实现在实际样品检测中的应用。该文从EAM技术常用的萃取剂方面入手，综述了基于纳米材料、离子液体等新兴萃取剂的EAM方法的构建，以及与液相色谱、气相色谱、原子吸收光谱或质谱等大型仪器联用，用于复杂基质中有害物质检测的研究...     

原子层沉积制备铱薄膜的特性研究

以乙酰丙酮铱[Ir(acac)3]和高纯氧为前驱体,采用原子层沉积(ALD)方法在基板温度为340℃的石英玻璃和硅基板上制备了金属铱薄膜。采用反射光谱测试仪、X射线电子能谱(XPS)、X射线衍射(XRD)、扫描电子显微镜(SEM)和原子力显微镜(AFM)等手段对不同厚度薄膜的微结构、表面形貌和光学性能进行了研究。结果表明,原子层沉积制备的Ir薄膜中元素纯度较高(大于95%),表面粗糙度低,并呈现多晶纳米颗粒。同时,Ir薄膜在紫外波段表现出较好的光学特性,可以用于制作Ir金属紫外光栅等光学器件。     

基于多重自我假设的人质困境问题

囚徒困境及其变形模型,揭示了个体理性与群体理性选择之间的矛盾,从个体利益出发的行为往往不能实现团体的最大利益.本文以多重自我替代传统经济学中理性人的假设,将双曲贴现应用到人质困境中,解决短期利益与长期利益的不一致性给决策带来的困扰,从而实现个人利益与社会利益的统筹协调.     

Estimation of vector static magnetic field by a nitrogen-vacancy center with a single first-shell ~(13)C nuclear(NV–~(13)C)spin in diamond

We suggest an experimental scheme that a single nitrogen-vacancy(NV) center coupled to a nearest neighbor~(13) C nucleus as a sensor in diamond can be used to detect a static vector magnetic field. By means of optical detection magnetic resonance(ODMR) technique, both the strength and the direction of the vector field could be determined by relevant resonance frequencies of continuous wave(CW) and Ramsey spectrums. In addition, we give a method that determines the unique one of eight possible hyperfine tensors for an(NV–~(13) C) system. Finally, we propose an unambiguous method to exclude the symmetrical solution from eight possible vector fields, which correspond to nearly identical resonance frequencies due to their mirror symmetry about~(14)N–Vacancy–~(13) C(~(14)N–V–~(13) C) plane.     

Loss of cold atoms due to collisions with residual gases in free flight in a magneto-optical trap

The loss rate of cold atoms in a trap due to residual gas collisions differs from that in a free state after the cold atoms are released from the trap. In this paper, the loss rate in a cold rubidium-87 atom cloud was measured in a magneto-optical trap(MOT) and during its free flight. The residual gas pressure was analyzed by a residual gas analyzer, and the pressure distribution in a vacuum chamber was numerically calculated by the angular coefficient method. The decay factor, which describes the decay behavior of cold atoms due to residual gas collisions during a free flight, was calculated. It was found that the decay factor agrees well with theoretical predictions under various vacuum conditions.     

限制零点个数的亚纯函数的正规定则

设k,n(≥k+1)是两个正整数,a(≠0),b是两个有穷复数,F为区域D内的一族亚纯函数.如果对于任意的f∈F,f的零点重级大于等于k+1,并且在D内满足f+a[L(f)]~n-b至多有n-k-1个判别的零点,那么F在D内正规·这里L(f)=f~((k))(z)+a_1f~((k-1))(z)+…+a_(k-1)f'(z)+a_kf(z),其中a_1(z),a_2(z),…,a_k(z)是区域D上的全纯函数.