氧化锌纳米带的低温无催化热蒸发制备及其表征

通过纯锌粉蒸发，在600 ℃无催化条件下成功制备了高质量的不同形貌的ZnO纳米带.该制备方法中控制产物形貌和尺寸的关键是氧、氩及锌蒸气的流速及分压.扫描电镜及高分辩透射电镜观察显示，氧化锌纳米带具有规整光滑及齿状等不同形貌，且皆为单晶，其生长由固-气机理控制.室温光致发光谱表明，齿状氧化锌纳米带在390 nm附近形成紫外发射峰；在455～495 nm时，形成绿光发射峰，该处由4个次级发射峰组成.     

三元混配配合物[Ni(PMBP-sal)(py)]的合成、表征与晶体结构

合成了混配配合物[Ni(PMBP-sal)(py)]，(PMBP：1-苯基-3-甲基-4-苯亚甲基吡唑啉酮-5，sal：水杨酰肼，py：吡啶)，并用元素分析，IR光谱，紫外可见吸收光谱，循环伏安和单晶X-射线衍射进行表征。结构分析表明N-(1-苯基-3-甲基-4-苯亚甲基吡唑啉酮-5)-水杨酰肼和吡啶与Ni(Ⅱ)配位形成略微畸变的平面正方形化合物。     

Synthesis of conjugated dendrons with nonlinear optical activity

New dipolar conjugated dendrons with electron-withdrawing groups on the periphery and electron-donating groups distributed at the core and throughout the dendritic skeleton have been conveniently synthesized. The pi-conjugated dendritic skeleton provides extended conjugation between each electron donor-acceptor pair, resulting in numerous traditional nonlinear optically active chromophores in one single dendron.     

钛阳极氧化膜的光诱导钴离子注入

发现光诱导下钴离子可以注入钛阳极氧化膜, 利用光电流谱技术和X-射线光电子能谱技术研究这一过程。结果表明: 在浓度≥0.10 mol·cm~(-3)的Co·(NO_3)_2溶液中, 光照使界面上的钴离子部份受激而具有较高的能量, 这些钴离子能够克服膜/溶液界面势垒和TiO_2晶格激活能进入氧化膜的四面体或八面体空位, 并可能与氧配位形成呈蓝色的钴四配位化合物或粉红色的钴六配位化合物。     

Solubility equilibria in the uric acid-sodium urate-water system

In a constant ionic medium, corresponding to a physiological environment (I_c = 0.15 mol dm⁻³ NaCl), the solubilities of anhydrous uric acid, uric acid dihydrate and monosodium urate monohydrate have been measured as a function of p[H] = −log[H⁺](2-8) and temperature (25°, 32°, 37° and 42°C). The solubility equilibria in the uric acid-sodium urate-water system are discussed on the basis of the solubility constants (K_s) and the first dissociation constant (K₁) of uric acid and the solubility product (K_s0) of monosodium urate. The quantities measured in this work are in good agreement with literature values, however, the present solubility data have a much higher precision.     

Low-cost multi-core inertial microfluidic centrifuge for high-throughput cell concentration

We developed a low-cost multi-core inertial microfluidic centrifuge (IM-centrifuge) to achieve a continuous-flow cell/particle concentration at a throughput of up to 20 mL/min. To lower the cost of our IM-centrifuge, we clamped a disposable multilayer film-based inertial microfluidic (MFIM) chip with two reusable plastic housings. The key MFIM chip was fabricated in low-cost materials by stacking different polymer-film channel layers and double-sided tape. To increase processing throughput, multiplexing spiral inertial microfluidic channels were integrated within an all-in-one MFIM chip, and a novel sample distribution strategy was employed to equally distribute the sample into each channel layer. Then, we characterized the focusing performance in the MFIM chip over a wide flow-rate range. The experimental results showed that our IM-centrifuge was able to focus various-sized particles/cells to achieve volume reduction. The sample distribution strategy also effectively ensured identical focusing and concentration performances in different cores. Finally, our IM-centrifuge was successfully applied to concentrate microalgae cells with irregular shapes and highly polydisperse sizes. Thus, our IM-centrifuge holds the potential to be employed as a low-cost, high-throughput centrifuge for disposable use in low-resource settings.     

单一手性层状钴有机膦酸配合物的结构和性质

基于手性有机膦酸配体(3-phenyl-2-[(phosphonomethyl)amino]propanoic,2-ppapH3)和辅助含氮配体(1,3-di(4-pyridyl)propan,1,3'-dpp)合成得到一对对映体纯的钴有机膦酸配合物R(S)-Co3(2-ppap)2(1,3'-dpp)2(H2O)2·2H2O(R-1 or S-1).该配合物晶体显示了层状结构,其中{Co1O4N2}八面体,{Co2O3N2}和{Co3O3N2}三角双锥分别与{PO3C}四面体的三个角连接,形成了含有八元环的无机金属链.这些无机金属链通过1,3'-dpp交联,在ac平面上形成分子层.同时研究了配合物R-1和S-1的热稳定性和手性光学活性.     

多商品分批次取送货的模糊需求车辆路径问题

为解决连锁企业库存不平衡问题,本文研究了考虑多商品多批次取送货的模糊需求车辆路径问题。该问题综合考虑了多货混装、多次访问、供需未匹配、客户需求不唯一以及需求不确定等因素。本文以运营成本最小为目标,构建MCVRPSPDFD数学模型,模型利用可信测度理论应对决策环境中的不确定因素,通过改进的禁忌搜索算法进行求解。为适应模型需求和提升运算效率,算法设计了合理的初始种群形成过程及编码解码方式,并通过参数测试选取合适的参数。算例结果显示,本文成果能有效解决连锁企业库存不平衡问题,决策者偏好值的变动会对运营成本产生影响。     

一种新的带扰动项的算法的全局收敛性

在本文中,我们提出了一种新的带扰动项的三项记忆梯度混合投影算法.在这种方法中应用了广义Armijo线搜索,并且仅在梯度函数在包含迭代序列的开凸集上一致连续的条件下证明了该算法的全局收敛性.最后给出了几个数值算例.     

Running Coupling Constants in N-N Interaction

The scalar and vector running coupling constants are derived using the renormalization group method in the σ-ω model. The numerical values of the two running coupling constants are obtained and the physical meaning of the result is discussed.