采用高级语言对硬盘加密的方法

本文提出了一种基于DOS本身特点的硬盘加密方法，它具有不破坏DOS文件和磁盘结构、支持磁盘优化软件、加密点隐蔽、兼容性好等特点．     

新生代农民工转户意愿及影响因素分析--基于江西省的调查数据

通过对江西省新生代农民工进行随机抽样问卷调查,本文运用多元有序Logistic模型对新生代农民工转户意愿及影响因素进行回归分析。结果显示,年龄、文化程度、是否具有职业资格等级证书、家中耕地亩数、家庭生活水平、家距离工作地点远近程度、家庭居住区域类型、务工居住住所类型对新生代农民工转户意愿有显著影响。基于分析得出的新生代农民工转户意愿影响因素,提出相应的政策建议。     

求解一类变形变分不等式的一个算法

针对文献（１）中提出了一类变形变分不等式给出一个简化的算法，并在一定条件下到了该算法的收敛性。     

泥沙与鄱阳湖水环境

分析并讨论了鄱阳湖泥沙的来源及其对鄱阳湖水环境质量的影响。     

矩形截面气升式环流反应器中非牛顿流体的气含率与传质系数的研究

研究了一种矩形截面气升式环流反应器,用幂律τ=η_ογ~n(n<1)来表示流体流变学特性的变化.在这类反应器中,假塑性非牛顿流体的气含率ε_g与传质系数K_La的变化规律可用半经验关联式表示ε_g=0.2535(η_ο5000~(n-1))~(-0.161)(1+A_d/A_r)~(-0.434)u_(gr)~(0.856-0.161n)K_La=0.0192(η_ο5000~(n-1))~(-0.902)(1+A_d/A_r)~(-1.228)u_(gr)~(1.955-0.902n)并讨论了该类反应器结构及运行状况,流体性质变化时,反应器传质动力学特性、流动特性和操作弹性变化的规律.     

织构型钙钛矿铁电材料的研究进展

简要介绍了压电铁电材料的种类及发展历程,重点比较了压电陶瓷和压电单晶在性能和制备中的差异,提出了制备织构型压电陶瓷的必要性.以钙钛矿型PMN-PT压电陶瓷为例,提出了产生织构结构的简便有效的方法-模板晶粒生长法(TGG法);同时具体分析了制备PMN-PT粉体、模板粒子的常用方法以及使模板产生定排列的方法.论述了目前已经取得的一些成果,提出了该体系织构材料今后的发展方向和应用前景.     

吲哚甲基海因的制备 I.加氢过程研究及催化剂的磁分离

采用30%T-1型Raney-Ni催化剂,以NaOH(1mol/L)为溶剂,在45℃,初始压力为3.0MPa的条件下,吲哚亚甲基海因加氢可以得到吲哚甲基海因,收率为85.6%。实验结果表明,吲哚亚甲基海因加氢速度对催化剂浓度为一级关系;在一定范围内,与初始氢压成正比关系。由不同反应温度下的反应初速度计算吲哚亚甲基海因加氢反应的表观活化能Ea为15.92kJ/mol。采用磁性材料固定方法可实现催化剂的回收利用。经20批次吲哚亚甲基海因加氢反应结果可知,催化剂的使用量降低为4.5%,吲哚甲基海因的收率可稳定在80%左右。     

Fabrication of submicron Li-rich Li2(Ti,Zr)O3 solid solution ceramics with sluggish grain growth rate

Doping and forming solid solution is an effective approach to tailor densification and grain growth. In this study, submicron Li₂(Ti,Zr)O₃ solid solution ceramics was successfully fabricated by a modified solid-state route for the first time. The use of appropriate starting powders can greatly reduce the synthesis temperature, and the preparation of Li₂(Ti,Zr)O₃ with submicron grain size is possible. The substitution of Ti by Zr will inhibit the phase transition from cubic to monoclinic structure, as well as the grain growth and pore removal. By doping 10-at.% Zr, the grain size was significantly decreased from several μm to 400 nm at 900°C, which contributes to a high conductivity eight times that of pure Li₂TiO₃. Moreover, after being heated at 900°C for 10 days, the grain size of Li₂(Ti,Zr)O₃ only increases to 5 μm; however, the grains of Li₂TiO₃ grows up to 16 μm with abnormal grain growth. The compositions of Li₂(Ti,Zr)O₃ are high uniform with no element segregation, indicating the sluggish grain growth rate is caused by the slow diffusion of Zr rather than segregation-induced solute drag. By adding excess Li and two-step sintering, the Li-rich Li₂(Ti,Zr)O₃ ceramic pebbles with high crush load of 50–60 N and small grain size of 300–500 nm were successfully fabricated. This work demonstrates a simple method for the synthesis of Li₂(Ti,Zr)O₃, which makes this material more widely accessible for exploration and also help accelerate its engineering application to be an advanced solid breeder.     

Homogeneous drag models in gas–solid fluidization: Big data analytics and conventional correlation

The drag force model is vital for capturing gas–solid flow dynamics in many simulation approaches. Most of the homogeneous drag models in the literature are expressed as a function of phase fraction (ε) and particle Reynolds number (Re_s). In this work, we use a “big data” approach to analyze ~10⁸ data points for drag coefficient (F_d) for Geldart Group A particles at atmospheric pressure and find that the contribution of Re_s on F_d is much less than ε based on the Maximal information coefficient analysis. Thus, these drag models are separately reduced to machine learning and conventional expressions only related to ε. The reduced models achieve almost the same predictive performance as the originals in bubbling, turbulent, and jet fluidizations. Moreover, the reduced models provide better numerical stability for coarse grid simulations. These findings provide new insights into the drag coefficient for Geldart Group A particles under full fluidization conditions.     

An elevated temperature infrared emissivity ceramic coating formed on 2024 aluminium alloy by microarc oxidation

An infrared emissivity coating material containing γ-Al₂O₃ was prepared on 2024 aluminium alloy surface by the microarc oxidation (MAO) method. The microstructure of the coatings was analysed by SEM, XRD and EDS techniques. The infrared emissivity properties tested at 500 °C were investigated by an infrared radiometer based on a Fourier transform infrared spectrometer. The results show that the infrared emissivity values of coated Al samples depend on the phase composition and surface roughness of the coatings. Corresponding to increasing coatings thickness, the gradually increasing γ-Al₂O₃ content and some oxide compounds containing Si and P contribute to the higher infrared emissivity value (about 0.85) in the wavelength range of 8–20 μm. The increasing surface roughness leads to an obvious increase in emissivity from 0.2 to 0.4 at wavelength 3–5 μm.