基于生成对抗网络的无载体信息隐藏

提出了一种基于生成对抗网络的无载体信息隐藏方法.发送方用伪装图像和Improved Wasserstein GAN生成一张与秘密图像相同的图像,发送方发送伪装图像,接收方收到伪装图像后用生成器生成和秘密图像视觉上相同的图像.与现有的信息隐藏方法相比,该方法不需要修改载体,能够有效地抵抗隐写分析工具的检测,能够达到秘密信息安全传输的目的.     

多胺基针刺布的制备及其在H2S去除中的应用

为了解决含硫化氢(H_2S)废气的高效净化问题,直接以腈纶针刺布为原材料,通过一步反应制备了多胺基针刺布,测得其交换容量为5.9 mmol/g,并用红外光谱和热分析技术对其进行了表征;研究了碱液存在下多胺基针刺布对H_2S的去除性能及气体流量、碱液浓度、增重率、氧含量和H_2S浓度等因素的影响,结果表明碱液和多胺基针刺布的协同作用对气体中的H_2S具有优异的去除性能.吸附饱和的多胺基针刺布可用碱液再生,且再生后性能无明显变化,在所设定实验条件下,针刺布处理容量和碱吸收容量分别稳定在30.6 mg/g和697.2 mg/g左右.     

多铁和磁电材料的第一性原理研究（英文）

多铁材料是一类由自旋、电荷、晶格和轨道等多种自由度的相互作用引起的具有2种或者2种以上铁序的功能材料.近年来关于多铁性的报道屡见报端杂志,表明越来越多的研究人员关注着这一领域的研究进展.在这些研究成果中,第一性原理研究在解释实验观测,发现新物理机制和预测新型多铁、磁电材料方面都扮演着先锋角色.本文回顾了第一性原理在材料领域,尤其是多铁性、磁电效应和隧道结研究中的广泛应用和主要成果.结合最近发展的理论研究方法,例如选择性轨道加场法,评述了这些手段在解释多铁和磁电材料中奇异物理现象方面的有效性.由于电控磁性是多铁领域和自旋电子学领域追求的共同目标,因此总结了第一性原理研究在电控磁性方面所取得的成果.最后,本文概述了多铁和磁电材料在实际应用中亟待解决的问题,并且着重展望了若干种利于解决多铁和磁电材料领域实际问题的研究方法.本文通过深入探讨过渡金属氧化物中的铁电起源以及多铁体中铁电性和磁序的共存现象,期望能有益于新型多铁和磁电材料的探索.     

Study on the Centralization Strategy of the Blood Allocation Among Different Departments within a Hospital

By far, the researches on how to distribute blood products among different departments in hospital have not been further studied, though the problem of blood shortage and wastage that caused by improper blood allocation is severe, which may endanger patient’s lives and impose considerable costs on hospitals. In order to solve this problem, this paper mainly studies on how to distribute the blood items among different departments within a hospital and investigates the allocation approach with the novel management method by centralizing the inventory of several different departments. By integrating the blood inventory requirements of some departments, the hospital could reduce the rate of blood shortage and wastage effectively, release the pressure of the occupancy of resources and reduce the bullwhip effect of blood products. This paper illustrates the centralization principle in hospital and formulates the mixed integer programming model to work out the optimal allocation network scheme and the optimal inventory setting for every department. And the results of the numerical example demonstrate that this centralization method could considerably reduce blood shortage and wastage in hospital by about 72% and 90% respectively. Furthermore, it could decrease the total cost by about 108,540 RMB a month on blood supply chain management in the hospital and improve the effect of some certain surgeries by transfusing the fresh blood to patients.     

不同萱草对SO_2的抗性差异研究

SO2是一种广泛存在的大气污染物.为了探明不同萱草在SO2污染地区的应用价值,采用急性静态熏气方法,研究了美国引种萱草和山西野生萱草对二氧化硫(SO2)的敏感性差异.结果表明:15种不同来源萱草受SO2处理后,对二氧化硫的敏感性均属于中抗及以上,均在极高于常规植物的临界浓度下才显轻微症状,伤害症状均表现为叶尖或者叶缘退绿发黄,叶片轻微萎蔫,随着浓度升高和处理时间延长,向内延伸,只是原有症状的加重,而不出现新症状.当浓度小于0.3 g·m-3时,所有萱草均可以在污染区使用,当浓度高于0.4 g·m-3时,美国萱草M29和M50不适合在极高浓度地区使用.山西野生萱草以平定1号综合抗性最强,美国萱草以M3,M26和M32综合抗性最强.     

从原型范畴理论看医学英语术语中的新词

医学英语术语是国内语言学研究者关注的重要对象.从认知语言学的原型范畴理论的视角对医学英语术语中的新词进行研究,可以发现医学英语术语的新词与原型转换和原型分裂之同有着密切的联系,新词的产生也体现了医学英语术语范畴边界的模糊性.     

基于阴影变换的动态灰值形态算子的研究

基于阴影变换和表面算子的理论,系统地研究了在空间变化(SV)即动态的二值形态学理论的基础上建立动态灰值形态算子的方法,证明了阴影集的相关结论,运用阴影变换和表面算子表示了SV灰值形态开、闭算子,并推导出腐蚀、膨胀以及开算子这3种算子所具有的代数表示形式,研究了腐蚀、膨胀、开、闭这4种算子的性质.     

时域光学拓扑成像方法的模拟和实验研究

针对现有的以修正的朗伯-比尔定律(modified Lambert-Beer law,MLBL)为理论模型的光学拓扑方法存在量化度不准确的问题,提出了一种基于最小二乘拟合算法的时域光学拓扑成像方法.该方法利用时域扩散方程在半无限空间条件下的解析解和测量曲线实现最佳匹配以计算相邻的源点与探测点之间的待测组织吸收系数变化值.对该时域光学拓扑成像方法进行了一系列的模拟验证,并以基于时间相关单光子计数(time-correlated single photon counting,TCSPC)技术的多通道时间分辨测量系统为平台进行了实验验证.结果表明:所提出的最小二乘拟合算法总体上优于传统的基于经验值光程的MLBL方法.     

Controlled synthesis of SnO2 with hierarchical Micro/Nano structure

Preparing SnO2 with hierarchical micro/nano structures by hydrothermal, coordination, templating and electrochemical deposition methods and their mechanisms are investigated. The result shows that the echinus-like SnO2 prepared by Method 1 is a typical Ostwald mechanism that develops from internally to externally. The cabbage-like SnO2 by Method 2 is produced with oxalic acid as complexing agent to set-up precursor of SnO2, and then precursors are bocked around the body that is around the body being bocked. The nest-like SnO2 by Method 3 is controlled by citric acid as coordinator for the nucleation as well as the grow rate and setup process. Spongy-like SnO2 by Method 4 is produced using PST as template, PST is be infiltered into SnO2 precursor by gravity and capillary and treated thermally to form a multiporous structure. The petal-like SnO2 by Method 5 is formed with crystal deposition emergence due to oxidation-reduction reactions of two electrodes in an electric field. XRD analyses shows that the five results are all pure phase SnO2. It provides basic data for SnOE industrial application.     

Cu衬底上ZnO纳米结构及其光催化性能分析

采用两步电化学沉积法在Cu衬底上沉积得到ZnO纳米结构薄膜。用X-射线衍射（XRD）和扫描电子显微镜（SEM）对其结构及形貌进行表征,发现先在Cu衬底上沉积一层Zn致密膜,更有利于在其表面上得到附着力强、形貌较好的ZnO纳米结构膜。系统考察了沉积温度和沉积时间等工艺参数对ZnO纳米结构的影响。结果表明,沉积温度和沉积时间对晶体结构和形貌有显著影响,通过对工艺进行适宜控制可以得到结晶性良好的六方纤锌矿型ZnO纳米结构膜。以罗丹明B为目标有机污染物,分析了ZnO膜的光催化性能,表明所制备的ZnO膜可以作为光催化剂,其光催化效率可达到72.4%。