电力线数字灰度图像增强算法

无人机巡线大大提高了输电线路巡线的效率,若利用计算机处理采集的数字图像可以进一步提高效率,而图像增强处理是计算机处理图像的一个重要过程.结合电力线数字灰度图像的特点,讨论了利用随机数学模型和模糊数学模型两类不同灰度图像增强算法,比较了这些算法的应用效果.分析了现有图像增强算法在电力线灰度图像中应用的不足,据此给出了一种基于模糊数学模型的改进型图像增强算法,并利用实例验证其具有更好的适用性.     

大型油库消防救援寻路算法改进

大型油库区的地形不同于城市、山地等复杂的地形,虽然范围较大,但是油库区地形十分规整,油罐等建筑排列整齐,且在储油罐区的道路是笔直畅通的.根据这些特点,将标准的A^*寻路算法进行改进.一方面,根据油库地形结构简单,搜索节点相对少的特点,对A^*算法中搜索Open表中节点的数据结构进行改进,采用排序算法提高了搜索效率;另一方面,根据储油罐区道路笔直畅通的特点,将道路分为有障碍路段和无障碍路段,分而治之,提高整体的寻路效率.实验证明,将两种改进方法进行结合,寻路时间明显缩短,平均搜索效率提高6.86%.     

SPR生物传感器在乳品工业中的应用

介绍了SPR的概念和SPR生物传感器基本原理，并从监测乳牛发情，检测乳品抗生素残留，检测乳品脂肪含量，检测乳品微生物污染和检测乳品掺假成分这5个方面综述SPR生物传感器在乳品工业中的应用及发展前景。     

Conceivable security risks and authentication techniques for smart devices: A comparative evaluation of security practices

With the rapidly escalating use of smart devices and fraudulent transaction of users data from their devices, efficient and reliable techniques for authentication of the smart devices have become an obligatory issue. This paper reviews the security risks for mobile devices and studies several authentication techniques available for smart devices. The results from field studies enable a comparative evaluation of user-preferred authentication mechanisms and their opinions about reliability, biometric authentication and visual authentication techniques.     

Lom: Discovering logic flaws within MongoDB-based web applications

Logic flaws within web applications will allow malicious operations to be triggered towards back-end database. Existing approaches to identifying logic flaws of database accesses are strongly tied to structured query language (SQL) statement construction and cannot be applied to the new generation of web applications that use not only structured query language (NoSQL) databases as the storage tier. In this paper, we present Lom, a black-box approach for discovering many categories of logic flaws within MongoDBbased web applications. Our approach introduces a MongoDB operation model to support new features of MongoDB and models the application logic as a mealy finite state machine. During the testing phase, test inputs which emulate state violation attacks are constructed for identifying logic flaws at each application state. We apply Lom to several MongoDB-based web applications and demonstrate its effectiveness.     

High Cationic Dispersity Boosted Oxygen Reduction Reactivity in Multi-Element Doped Perovskites

Oxygen-ion conducting perovskite oxides are important functional materials for solid oxide fuel cells and oxygen-permeable membranes operating at high temperatures (>500 °C). Co-doped perovskites have recently shown their potential to boost oxygen-related kinetics, but challenges remain in understanding the underlying mechanisms. This study unveils the local cation arrangement as a new key factor controlling oxygen kinetics in perovskite oxides. By single- and co-doping Nb⁵⁺ and Ta⁵⁺ into SrCoO_3-δ, dominant factors affecting oxygen kinetics, such as lattice geometry, cobalt states, and oxygen vacancies, which are confirmed by neutron and synchrotron X-ray diffraction as well as high-temperature X-ray absorption spectroscopy, are controlled. The combined experimental and theoretical study unveils that co-doping likely leads to higher cation dispersion at the B-site compared to single-doping. Consequently, a high-entropy configuration enhances oxygen ion migration in the lattice, translating to improved oxygen reduction activity.     

粗糙集理论中求取最小决策规则的研究

本文探讨了粗糙集理论中最小决策规则的求取方法，提出决策依赖度的定义，尝试从最短的条件属性组合中提取尽可能多的决策规则。只有现有长度的决策规则无法完全覆盖所有样本时，才会考虑增加决策规则的长度。同时提出了3种减少计算复杂性的方案：1）引入跳跃系数λ；2）在计算中只对具有相同决策值的样本进行等价类划分，从而避免了对含有不同决策值的等价类的无用划分；3）设计Remain集合，只针对其中的样本进行等价类的划分，随着Remain中样本数的减少，计算量会大幅下降。此外，本文所提出的基于决策依赖度的跳跃式决策规则求取方法可以直接应用于不完备信息系统，因此具有良好的实用价值。     

Formation of planar waveguide in BiB3O6 crystal by MeV carbon implantation

Non-leaky planar waveguide structure has been fabricated in x-cut BiB₃O₆ crystal by 6 MeV C³⁺ ion implantation at a dose of 1 × 10¹⁴ ions/cm². The effective refractive indices of the waveguide are measured at a wavelength of 632.8 nm. We perform a computer code based on the finite difference method to reconstruct the refractive index profiles of n_x and n_y of this waveguide. The beam propagation method is used to calculate the electric and magnetic field profiles in the waveguide region from the reconstructed refractive index profiles. Our simulated data show that the refractive index increased waveguide layer can confine the mode completely.     

Applications and Mechanisms of Ionic Liquids in Whole-Cell Biotransformation

Ionic liquids (ILs), entirely composed of cations and anions, are liquid solvents at room temperature. They are interesting due to their low vapor pressure, high polarity and thermostability, and also for the possibility to fine-tune their physicochemical properties through modification of the chemical structures of their cations or anions. In recent years, ILs have been widely used in biotechnological fields involving whole-cell biotransformations of biodiesel or biomass, and organic compound synthesis with cells. Research studies in these fields have increased from the past decades and compared to the typical solvents, ILs are the most promising alternative solvents for cell biotransformations. However, there are increasing limitations and new challenges in whole-cell biotransformations with ILs. There is little understanding of the mechanisms of ILs’ interactions with cells, and much remains to be clarified. Further investigations are required to overcome the drawbacks of their applications and to broaden their application spectrum. This work mainly reviews the applications of ILs in whole-cell biotransformations, and the possible mechanisms of ILs in microbial cell biotransformation are proposed and discussed.     

铝合金基材用防腐防污涂层体系的选择和涂装工艺研究

论述了目前涂敷在铝合金基材上的重防腐涂料、防污涂层体系的筛选评价方法,研究了相关的表面处理工艺,提出了适合船舶使用的铝合金用涂层体系及相关施工工艺。