激光末制导炮弹武器系统新型激光编码方案

基于对激光制导武器系统激光编码及波门设置特点的分析，提出了激光末制导炮弹武器系统的新型激光编码方案。分析表明，该方案兼有脉冲间隔编码和有限位随机周期脉冲序列的优点，首脉冲易确定，无固定重频和周期性，我方容易解码而敌方难以识别，具有较强的抗有源欺骗干扰能力。     

双向鉴别计数器的设计

本文设计了一种能对物流进行进、出双向鉴别计数的新颖计数器。详细地介绍了能反映物件进、出的信号检测电路，物件进、出鉴别计数电路及显示电路。为现代物流业、生产流水线等场合提供了一种简便可行的双向计数方法。     

煤矿用对旋式局部通风机的若干问题

提出对旋式局部通风机具有高效率、低噪声、高风压、大风量性能特性的说法是不符合实际的宣传.分析了开发设计者的包装方法,并对轴流式通风机与对旋式局部通风机作了比较和试验研究.     

A PRNU-based counter-forensic method to manipulate smartphone image source identification techniques

The increased diffusion of digital images generated by mobile devices through social networks, personal and professional communications, etc. is self-evident. This creates potential problems because some of these images may be used as supporting evidence for different criminal cases. In this paper, algorithms are proposed based on sensor noise and wavelet transforms which can alter the information which is usually employed to find the source of an image, and forge it so that it could point to a different, unrelated device. In the state of art we will show that there are already some algorithms capable of carrying out these manipulations, but they generally need much more and more complex data than our proposal. They also generally need physical access to the camera whose generated images you want to tamper. Our proposal algorithm to destruct the image identifiable data, only needs the picture which will be anonymized. Also, our proposal to forge the image identifiable data only needs a set of photos from the attacker camera, and the picture to be tampered. In particular, it does not need access to the camera that will be falsely linked to the picture. These scenarios are the most common and realistic. The algorithms proposed will help to strengthen existing techniques and develop new forensic approaches for mobile image source identification that will be more robust against attacks.     

Elucidation of a preparation method for copper ion-exchanged ZSM-5 samples exhibiting extremely efficient N2-adsorption at room temperature: effect of counter ions in the exchange solution

The adsorption of N₂ on a copper ion-exchanged ZSM-5 sample (CuZSM-5) prepared by ion exchange using an aqueous solution of copper propionate, Cu(C₂H₅COO)₂, was examined at room temperature by measuring the FT-IR spectra, adsorption isotherms and heat of adsorption. This sample was found to be extremely efficient in terms of N₂ adsorption with regard to both the amount and the energy (i.e., heat) of adsorption, compared with samples prepared by a conventional ion-exchange method using an aqueous solution involving Cu²⁺ and simple counter ions, Cl⁻ or NO₃⁻. To clarify the specificity of the newly-prepared sample, the ion-exchange of ZSM-5 with Cu²⁺ was carried out by employing aqueous solutions involving Cu²⁺ and various types of counter ions [propionate (C₂H₅COO⁻), acetate (CH₃COO⁻), formate (HCOO⁻), chloride (Cl⁻) and nitrate (NO₃⁻) ions]. When the ion exchange was performed by using a Cu(C₂H₅COO)₂ or Cu(CH₃COO)₂ solution, the Cu²⁺ species with propionate or acetate ligand (in the monomer state) were ion-exchanged in ZSM-5, as confirmed by the DR, EPR and FT-IR spectra for CuZSM-5. In contrast, Cu²⁺ species were present in the form of aquo-complexes in samples prepared with other solutions. This distinct difference can be ascribed to the difference in the pK_a values of the counter ions; carboxylate ions, with a high pK_a value, are inclined to form a complex with Cu²⁺. Using this newly applied Cu(C₂H₅COO)₂ solution, the present ion-exchange method has the potential to develop new effective materials that possess the specific adsorption and catalytic properties of CuZSM-5.     

无位置传感器车载冷凝风扇无刷直流电机控制系统研究

无刷直流电机因其具有结构简单、调速灵活的优点而被用于多种行业,尤其在汽车电子领域得到了广泛的应用。本文对该电机的工作原理和数学模型进行分析与研究,重点讨论了起动及负载突变时电机的控制策略。通过Madab／Simulink进行验证分析,仿真结果表明,所建立的模型具有非常良好的可用性和稳定性。     

基于CUDA的SKINNY加密算法并行实现与分析

针对SKINNY加密算法在中央处理器（CPU）下实现效率偏低的问题,提出一种基于图形处理器（GPU）的快速实现方法。首先,结合SKINNY算法的结构特征提出优化方案,将5个分步操作优化整合为1个整体运算;然后,分析该算法的电子密码本（ECB）模式和计数器（CTR）模式的特性,并给出并行粒度、内存分配等并行设计方案。实验结果表明,与传统的CPU实现方法下的SKINNY算法相比,基于计算统一设备架构（CUDA）实现的SKINNY算法的效率和吞吐量得到很大提升。具体来说,当处理的数据达到16 MB及以上时,在所提实现方法下,SKINNY算法的ECB模式的加速效率提升峰值为99.85%,加速比峰值为671,CTR模式的加速效率提升峰值为99.87%,加速比峰值为765;而与已有AES-256（ECB）和SKINNY_ECB并行算法比较,新提出的SKINNY-256（ECB）并行算法的吞吐量分别是它们的吞吐量的1.29倍和2.55倍。     

一种频率可调的数字移相器设计

介绍基于单片机实现两路同频信号间数字移相,并利用锁相环和定时/计数器8253改变两路信号频率的方法。     

A facile one-step synthesis and fabrication of hexagonal palladium-carbon nanocubes (H-Pd/C NCs) and their application as an efficient counter electrode for dye-sensitized solar cell (DSSC)

Hexagonal palladium-carbon nanocubes (H-Pd/C NCs) were prepared using a simple one-step chemical synthesis protocol and subsequently the prepared materials were used as the counter electrode (CE) in dye sensitized solar cell (DSSC) to replace the platinum (Pt) electrode. The H-Pd/C NCs were characterized by a variety of suitable analytical techniques including powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) analysis to evaluate the crystalline, structural, morphological, compositional, chemical state and surface area. The BET nitrogen adsorption /desorption analysis shows that the as-prepared H-Pd/C NCs sample had a large surface area (568.8 m² g⁻¹) with average pore size of ∼3 nm. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analyses indicate that the H-Pd/C NCs have low charge-transfer resistance on the electrolyte/electrode interface and high electrocatalytic activity for the reduction of triiodide to iodide redox electrolyte and hence it is used as a CE in DSSC. The H-Pd/C NCs showed an overall power conversion efficiency (PCE) of 4.1% which performance is comparable with the conventional Pt CE (4.0%) under the identical condition.     

双螺杆三维实体造型的研究

本文根据双螺杆横截面几何造型方程，运用ＭＤＴ软件包，实现了同向和异向旋转双螺杆的三维实体造型。它可用来检验两螺杆的啮合状态，为双螺杆几何特性参数的合理选择和科学设计提供理论依据。