低喷淋密度超亲水表面水平管降液膜温度分布

水平管降液膜蒸发广泛应用在石油、化工、海水淡化等领域,对低喷淋密度温度演化规律的研究有助于拓宽其应用范围,理解其微观机理。本文在超亲水表面上结合红外热追踪技术,对水平管降液膜表面的温度演化规律进行了研究,分析了温度分区现象和温升规律。实验中首次发现了马鞍形液膜内部的高温环状结构,并结合三维数值模拟揭示了掺混作用导致的局部高温环状结构形成的内部机理。     

基于B3PyMPM∶Cs高效叠层OLED器件的制备

以B 3 PyMPM∶Cs/Al/HAT-CN作为电荷生成单元制备高效叠层绿色磷光有机电致发光器件,叠层器件的最大电流效率和最大流明效率分别为172.2 cd/A和111.0 lm/W,在5 mA/cm^2电流密度下,叠层器件的电压和亮度分别为传统器件的2.04倍和2.84倍.为了探究叠层器件性能优于传统器件的原因,研究了电荷生成单元内的电荷产生和注入过程,以及薄层铝对电子注入特性和电荷生成单元稳定性的影响.实验结果表明,电荷能够有效地在电荷生成单元内产生并顺利注入电子传输层中,B3PyMPM∶Cs和HAT-CN间Al薄层的插入能够进一步提高电子注入效率及器件结构的稳定性.     

Investigation of active-region doping on InAs/GaSb long wave infrared detectors

The eight-band κ·p model is used to establish the energy band structure model of the type-II InAs/GaSb superlattice detectors with a cut-off wavelength of 10.5μm,and the best composition of M-structure in this type of device is calculated theoretically.In addition,we have also experimented on the devices designed with the best performance to investigate the effect of the active region p-type doping temperature on the quantum efficiency of the device.The results show that the modest active region doping temperature(Be:760℃)can improve the quantum efficiency of the device with the best performance,while excessive doping(Be:>760℃)is not conducive to improving the photo response.With the best designed structure and an appropriate doping concentration,a maximum quantum efficiency of 45% is achieved with a resistance-area product of 688?·cm^2,corresponding to a maximum detectivity of 7.35×10^11cm·Hz^1/2/W.     

Catalytic properties of mesoporous materials supported heteropoly acids for Baeyer-Villiger oxidation of cyclic ketones

Three mesoporous molecular sieves loaded silicotungstic acids, named HSiW/SBA-15, HSiW/MCM-41, HSiW/MCM-48, were prepared and characterised by XRD, FT-IR, TEM and SEM. The catalytic performance of the prepared materials for the Baeyer-Villiger oxidation of cyclic ketones was carried out in the presence of 30%H₂O₂ under mild conditions. These loading materials were proved to be efficient and reusable catalysts, they all exhibited excellent catalytic performance for the Baeyer-Villiger oxidation of cyclic ketones with 30% H₂O₂ as oxidant. Many cyclic ketones were efficiently converted to the corresponding lactones with up to 90% conversions and high selectivities under the optimum reaction conditions.

Cyclic ketones were efficiently oxidised by mesoporous materials sopported silicotungstic acid to the corresponding lactones with 30%H₂O₂ as oxidant. All of the catalysts showed promising recyclability in the reactions.     

无绝缘高温超导双饼线圈的瞬态电热特性分析

无绝缘高温超导线圈具有良好的电热稳定性和机械紧凑性,但其充电过程中却有明显的磁场延迟现象。为详细了解无绝缘高温超导线圈励磁过程的瞬态特性,建立了无绝缘高温超导线圈的同轴圆环等效电路模型。通过绕制一个670匝的无绝缘高温超导双饼线圈,在液氮温度下进行不同充电速率的励磁实验,初步验证了等效电路模型的正确性。基于该模型,针对线圈励磁过程的充电和恒流阶段,仿真得到了线圈各匝的径向电流分布规律和电热损耗特性。     

非晶态Fe40Ni38Mo4B18（2826MB）合金粉末的高压压结与磁性研究

 本文研究了非晶态软磁材料Fe₄₀Ni₃₈Mo₄B₁₈（2826MB）合金粉末在高压下加温压结成三维大尺寸产品的可行性，并通过压结样品的复数导磁率在弱交变磁场中的行为，探讨了压结条件对压结样品的软磁性能的影响。结果表明，在本实验所采用的压力范围内，压结温度对压结样品的性能的影响大于压结压力的影响。     

Formulae of force at a point in the interior of a half space with shear modulus linearly varied with depth

According to a lemma and an assumption, this paper prexenis formulae of force at a point in the interior of a half space with Poisson’s ratio v = constant and shear modulus G linearly varied with depth. These formulae can be used as an approximate basic solution when the integral equation method is employed for the analysis of piles and other geotechnical engineering problems.     

面向三维视频系统的深度图压缩方法研究

理论分析了基于Mesh、JPEG、模式函数等静态深度图压缩算法,然后比较了基于H．264深度视频独立压缩算法、彩色和深度视频运动矢量共享的深度视频压缩算法,给出2种深度视频压缩算法的实验对比,并对深度图压缩算法发展做了相关的预测和展望．     

On the structure of split Leibniz triple systems

We study the structure of arbitrary split Leibniz triple systems with a coherent 0-root space. By developing techniques of connections of roots for this kind of triple systems, under certain conditions, in the case of T being of maximal length, the simplicity of the Leibniz triple systems is characterized.     

自控液晶光阀组式光刻快门研究

通过理论推导,构建了抗蚀剂的感光特性、光源的光效与曝光量之间的数学模型,为液晶光阀代替穿孔带提供了理论依据.结合液晶光阀的工作原理和光刻快门的控制原理,对液晶光阀组的控制进行了研究并给出了其控制电路图.通过实际光刻试验,自控液晶光阀组光刻快门机构可以完成编码图案的控制,通光控制达到了预计要求,刻出的图案清晰,线条陡直.证明液晶光阀组替代穿孔带用作光刻快门是完全可行的.