金属Al背电极二维AZO光栅的制备和陷光特性

研究了背电极金属Al膜上二维ZnO:Al光栅的制备及其反射光谱特性.在厚度为300 nm的Al膜上溅射80 nm ZnO:Al薄膜,旋涂AZ5206光刻胶,用波长为325 nm的激光进行光刻制作光栅掩模.采用溶脱-剥离法在Al衬底上制备周期(624~1250 nm)和槽深(100~300 nm)可独立调控的ZnO:Al二维光栅.表面形貌采用原子力显微镜和扫描电镜观察,反射光谱用带积分球的分光光度计测试,双向反射分布函数用散射仪测量.结果表明,300 nm Al膜上织构二维ZnO:Al光栅背电极结构,当光栅槽深为228 nm,周期从624 nm增加到986 nm时,背电极总反射率、漫反射率以及雾度均随光栅周期增大而显著增加,而当周期从986 nm增加到1250 nm时,总反射率、漫反射率以及雾度略有增加.双向反射分布函数测试结果进一步证实了上述实验结果,即随着周期增大,漫反射峰值越大,衍射峰个数也增多.提示背反电极上槽深为228 nm、周期为986 nm的二维ZnO:Al光栅具有较好的散射效果,其中漫反射占总反射的百分比为45%.     

Fluorinated Porous Poly(spirobifluorene) Via Direct C‒H Arylation: Characterization,Porosity, and Gas Uptake

Considering intrinsic properties of conjugated polyfluorenes and special functions of porous polymers, synthesis of fluorinated porous poly(spirobifluorene) via direct C?H arylation polycondensation is explored. Owing to the contorted structure and cross-linking nature, the obtained polymer FPSBF shows permanent porosities with Brunauer–Emmett–Teller specific surface area up to 700 m² g^?1 and exhibits a narrow pore size distribution with the dominant pore size at about 0.63 nm, which is more suitable for adsorption of small gas molecules. Based on the measured gas physisorption isotherms with pressure up to 1.13 bar, the obtained polymer shows good uptaking capacities for hydrogen (1.30 wt% at 1.0 bar and 77 K) and methane (4.80 wt% 1.0 bar and 273 K). Moreover, FPSBF has significant adsorption selectivity for CH₄ against N₂ and the estimated ideal adsorption selectivity ratio is up to 30/1 at 1.0 bar and 273 K, which makes the material possess potential application in gas separation.     

基于理想点-矢量投影法的创新需求权重确定方法

现有的创新需求权重计算方法大多只考虑顾客、技术人员和决策者三者中的一方或者两方对创新需求权重的影响,鲜有方法将三方同时纳入需求权重计算过程,这很容易造成因信息考虑不全面,造成需求权重的精确度不高或失准等问题。鉴于此,本文提出一种基于理想点-矢量投影法的创新需求权重确定方法,它将顾客、技术人员和决策者三方的诉求在三维矢量空间中进行集成。分别计算创新需求的需求类别因子、需求技术成熟度和需求偏好度,采用理想点-矢量投影法得到理想需求矢量,并在此基础上计算每项创新需求权重值。文章最后通过汽车方向盘的研发的案例,验证了所提方法的有效性和可行性。     

通过开关单元调节赋予荧烷水致变色性质及喷水打印应用

喷水无墨打印概念的提出对于改善环境污染、资源消耗等问题做出了突出贡献,然而已有的水致变色染料种类较少且开发困难。 本文通过对荧烷化合物(9-(2-羧基苯基)-3,6-双(二乙氨基)占吨翁氯化物,罗丹明B)开关单元进行调控,从而调节分子开关环的动态平衡,实现了酸致变色染料到水致变色染料的调节,并展现了其在喷水无墨打印方面的应用。 该荧烷衍生物水致变色染料的合成可以直接以市售的荧烷化合物为原料,通过两步反应简单修饰,得到的染料摩尔吸光系数达到1×10⁵,所制备的打印纸水写前后反射率变化50%,有望大规模应用到喷水无墨打印中。     

基于“超星泛雅平台+学习通”快速完善课程的技巧和实践

Due to COVID-19, all the universities in China has postponed their spring semester. The Ministry of Education issued a call "suspending classes without stopping learning" to require universities to carry out online teaching actively. Up to now, Online teaching has been implemented for nearly eight weeks, and teachers are familiar with online teaching methods. Then, how to hold online courses efficiently and refine course resources have become the main tasks for teachers. This paper elaborates on the practice and skills of rapid improvement of online course and interactive teaching based on "Chaoxing fanya platform and Xuexitong". Using these skills can not only reduce the workload of teachers, but also build high-quality online courses to ensure teaching quality and objectives. This paper could provide a reference for college teachers to implement online teaching efficiently.     

广义路代数与点Hopf代数

Most of pointed Hopf algebras of dimension p^m with large coradtical are shown to be generalized path algebras. By the theory of generalized path algebras, the representations, homological dimensions and radicals of these Hopf algebras are obtained. The relations between the radicals of path algebras and connectivity of directed graphs are given.     

稻壳基活性炭对锰酸锂电池倍率性能的影响

稻壳基活性炭(RH-AC)具有天然的多级孔道结构,是由稻壳碳化和活化两步得到的。 用RH-AC和锰酸锂(LMO)混合制备复合电极,以锂片为对电极,组装半电池进行恒流充放电测试。 实验发现:含有质量分数为5%的RH-AC与90.5%的LMO的复合电极(RH-AC5)在5C电流密度循环100圈后比容量为89.3 mA·h/g,容量保持率高于89%,远优于纯锰酸锂电极。 采用循环伏安法计算出的锂离子扩散系数,及利用交流阻抗测试拟合后得到的结果进一步验证了该结论。     

Cytotoxic and DNA-binding properties of two ruthenium(II) porphyrin complexes

Two ruthenium(II) porphyrin complexes [Ru(L)₂Cl(PTP)]⁺ (L = bpy, 1, phen; 2; PTP = 5-(3′-pyridyl)-10,15,20-trimethylphenylporphyrin) have been synthesized and their antitumor activities have been evaluated by MTT(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) methods. Both complexes exhibit high inhibitory activity against the growth of human cervical carcinoma cell line HeLa, both with and without light treatment. However, when treated with light, the inhibitory activity for both complexes increases at low drug concentration. Spectroscopic studies show that both complexes can bind to HeLa DNA tightly with apparent binding constants of 1.54(±0.07) × 10⁵ and 1.01(±0.02) × 10⁵ M⁻¹ for 1 and 2, respectively.     

无墨喷水可重复打印纸工业化制备

“无墨喷水打印”技术因其绿色环保的特点引起了广泛关注,推进无墨喷水可重复打印纸的产业化具有重要的意义。 本文以具有水致变色性质的吲哚并[2,1-b]噁唑啉染料分子(TM)为例,选定聚对苯二甲酸乙二醇酯(PET)代替滤纸基材,通过筛选合适的表面活性剂、调整染料用量以及涂层厚度,探究并得到了一种无墨喷水可重复打印纸的工业化制备工艺。 结果表明,利用优化后的制备工艺得到的无墨喷水可重复打印纸具有良好的可重复书写性能,并通过小量生产测试验证该制备工艺可以应用于实际工业生产。