On-line integrated production and outbound distribution scheduling to minimize the maximum delivery completion time

In this paper, we consider the on-line integrated production and outbound distribution scheduling problem to minimize the maximum delivery completion time. All jobs arrive over time, and each job and its processing time become known at its arrival time. The jobs are first processed on a single machine and then delivered by a vehicle to a single customer. The vehicle can deliver at most c jobs to the customer at a time. When preemption is allowed and c≥2, we can provide an on-line algorithm with the best competitive ratio \(\frac{\sqrt{5}+1}{2}\approx1.618\). When preemption is not allowed, we provide an on-line algorithm which has the best competitive ratio \(\frac{\sqrt{5}+1}{2}\approx1.618\) for the case c=1 and has an asymptotic competitive ratio \(\frac{\sqrt{5}+1}{2}\approx1.618\) for the case c≥2.     

荷叶碱自组装纳米粒的制备与评价

以大豆卵磷脂和壳聚糖为原料，制备磷脂-壳聚糖自组装纳米粒来包埋荷叶碱以提高荷叶碱的稳定性，以包封率为指标探究最佳制备工艺，并对纳米粒的贮藏稳定性、消化稳定性和体外释放特性进行评价。结果表明：原始的溶剂注入法制备的荷叶碱自组装纳米粒包封率只有20.08%；在修改后的溶剂注入法下，在壳聚糖水相中添加质量分数为2%的水溶性维生素E时具有最大包封率（51.13%），此时纳米粒的平均粒径为142.23nm，电位为+24.57mV，外形类似球形。自组装纳米粒可显著提升荷叶碱的贮藏稳定性和消化稳定性（P＜0.05）：在室温下（25℃）经包埋的荷叶碱的半衰期由未被包埋时的36.2d提升至53.1d，在低温下（4℃）经包埋的荷叶碱的半衰期由未被包埋时的56.2d提升至86.2d；被纳米粒包埋的荷叶碱经肠胃消化后的保留率由未被包埋时的20.29%提升至82.98%。体外模拟释放实验表明自组装纳米粒具有一定的缓释性。     

1,4-丁炔二醇中痕量硅的测定

探讨了在非离子表面活性剂OP的存在下,硅锑钼蓝与罗丹明6G四元缔合体系的显色条件,表观摩尔吸光系数达到2.01×10~5L/mol·cm。提出了快速准确地测定痕量硅的分光光度分析方法。     

Coupled and forced patterns in reaction-diffusion systems

Several reaction-diffusion systems that exhibit temporal periodicity when well mixed also display spatio-temporal pattern formation in a spatially distributed, unstirred configuration. These patterns can be travelling (e.g. spirals, concentric circles, plane waves) or stationary in space (Turing structures, standing waves). The behaviour of coupled and forced temporal oscillators has been well studied, but much less is known about the phenomenology of forced and coupled patterns. We present experimental results focusing primarily on coupled patterns in two chemical systems, the chlorine dioxide-iodine-malonic acid reaction and the Belousov-Zhabotinsky reaction. The observed behaviour can be simulated with simple chemically plausible models.     

Optical properties and residual stress in aluminum nitride films prepared by alternating-current dual reactive magnetron sputtering

Aluminum nitride films were deposited by alternating-current dual reactive magnetron sputtering. The influence of different nitrogen flow and working pressures at a sputtering power of 5 kW on the refractive index, extinction coefficient, crystalline structure, residual stress, and surface roughness of aluminum nitride films was discussed. The aluminum nitride film would have high refractive index, low extinction coefficient and small residual stress at suitable nitrogen flow rate and low working pressure.     

An experimental investigation on the combustion characteristics of a direct injection diesel engine fuelled with an algal biodiesel and its diesel blends

Clean Technologies and Environmental Policy - Conscientious efforts by researchers established that microalgae have huge potential for future energy production. Microalgae strain Euglena sanguinea...     

基于双曲线临界状态的改进剑桥模型及数值实现

针对传统剑桥模型不能很好反映重塑黏土力学及临界强度特性的缺陷，在试验研究的基础上，对其临界状态进行改进。不排水三轴试验发现，重塑黏土的临界状态线表现为双曲线的形态，因此，将双曲线临界状态与剑桥模型相结合，建立改进的剑桥模型，并在FLAC3D程序中进行二次开发。同时针对FLAC3D中对塑性因子算法较为繁琐的问题，引入牛顿–辛普森迭代法进行改进。最后，运用改进的剑桥模型对不同压实度土样进行三轴数值模拟试验。结果表明：改进的剑桥模型能较好地反映重塑土体的力学特性，改进后的算法计算精度较高，执行效率较好。     

浅谈肌理对陶瓷雕塑的作用

肌理是陶瓷雕塑非常重要的表现手法,也是非常关键的表现形式。它作为一种视觉效果,很显然的表现了创作者的艺术理念,在陶瓷雕塑中不适当的运用肌理装饰,它不仅仅起反作用,还会直接破坏了整个雕塑的效果;而运用好肌理产生的效果,会让创作者的作品在原有的基础上更上一层楼。     

Residual stress in obliquely deposited MgF2 thin films

MgF(2) films with a columnar microstructure are obliquely deposited on glass substrates by resistive heating evaporation. The columnar angles of the films increases with the deposition angle. Anisotropic stress does not develop in the films with tilted columns. The residual stresses in the films depend on the deposition and columnar angles in a columnar microstructure.