Batman University

About: Batman University is a education organization based out in Batman, Turkey. It is known for research contribution in the topics: Diesel fuel & Diesel engine. The organization has 300 authors who have published 810 publications receiving 10346 citations. The organization is also known as: Batman Üniversitesi.

Tuning the optical and morphological features of CuxO thin films via La doping

Abstract: In the present investigation, the undoped and La doped CuxO thin films are deposited on glass substrates by sol-gel spin coating method. The effect of various La doping concentrations on the chemical composition, morphological and optical properties of CuxO thin films have been extensively studied using X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM), Scanning electron microscopy (SEM), and UV–Vis diffuse spectrophotometer. The valence states of Cu, La and O have been identified by X-ray photoelectron spectroscopy (XPS) method. The AFM have demonstrated that the surface roughness of CuxO thin films decreases with increasing La concentration. Optical analyses have revealed that the optical band gap energy of CuxO thin films widens from 2.063 eV to 2.090 eV as the La concentration increases from 0% to 10%. Moreover, the Urbach energies, Eu, of the undoped and La substituted CuxO thin films have been determined.

Examination of a New Defense Mechanism: Honeywords.

Abstract: It has become much easier to crack a password hash with the advancements in the graphicalprocessing unit (GPU) technology. An adversary can recover a user’s password using brute-force attack on password hash. Once the password has been recovered no server can detect any illegitimate user authentication (if there is no extra mechanism used). In this context, recently, Juels and Rivest published a paper for improving the security of hashed passwords. Roughly speaking, they propose an approach for user authentication, in which some false passwords, i.e., “honeywords” are added into a password file, in order to detect impersonation. Their solution includes an auxiliary secure server called “honeychecker” which can distinguish a user’s real password among her honeywords and immediately sets off an alarm whenever a honeyword is used. In this paper, we analyze the security of the proposal, provide some possible improvements which are easy to implement and introduce an enhanced model as a solution to an open problem. Keywords-Security, Authentication, Password, Honeywords

Active Fault Tolerant Control of Grid-Connected DER: Diagnosis and Reconfiguration

Abstract: In this paper, we propose an active fault tolerant control (FTC) to regulate the active and reactive output powers of a voltage source converter (VSC) in the case of actuator failure. The active fault tolerant controller of the VSC which connects a distributed energy resource to the distribution power grid is achieved through the fault diagnostic and controller reconfiguration units. The diagnostic unit reveals the actuator failure by comparing the known inputs and measured outputs of VSC with those of the faultless model of the system and testing their consistency. In the case of actuator failure, the reconfiguration unit adapts the controller to the faulty system which enables the VSC to track the desired active and reactive output powers. The reconfiguration unit is designed using the virtual actuator which does not interfere with the regular controller of the VSC. The effectiveness of the proposed active FTC is evaluated by the numerical simulation of a VSC connected to the AC distribution grid.

Ecological ideals, sustainable tourism and the heritage concept of an eco-village: The case of Arcosanti, USA

Abstract: Arcosanti in Arizona, USA, is a yet-to-be completed ecological settlement which reflects the major ideas of Paolo Soleri, an Italian architect and philosopher, on an alternative type of city. Based...