Hybrid Algorithm to Detect DDoS Attacks in VANETs

Wireless Personal Communications - Security and safety are fundamental issues in any wireless network. The problem becomes serious when the specified network is Vehicular Adhoc Network (VANET)....     

Evaluating the Performance of Various SVM Kernel Functions Based on Basic Features Extracted from KDDCUP'99 Dataset by Random Forest Method for Detecting DDoS Attacks

Wireless Personal Communications - Currently the rapid development of technology is taking place in the field of cloud computing. Cloud computing environment is the very demanding. It is easily...     

FLEAC: Fuzzy Logic-based Energy Adequate Clustering Protocol for Wireless Sensor Networks using Improved Grasshopper Optimization Algorithm

Wireless Personal Communications - Sensor nodes (SNs) in wireless sensor networks (WSNs) sense surrounding environmental data and transfers it to the end user via multi-hop transmission which...     

Superiority of thin-layer chromatography over high-performance liquid chromatography in enantioseparation

JPC – Journal of Planar Chromatography – Modern TLC - The scientific development in the area of enantioseparation during the last few decades has centered on the production of new...     

Photoconductive properties of some chemically deposited (Cd-Pb)S films

Films of (Cd-Pb)S have been prepared using chemical deposition in aqueous alkaline bath and their subsequent condensation on substrates. Important achievements in terms of electrical response, optical absorption and photoconductivity (PC) excitation spectra, SEM, XRD and photoluminescence (PL) studies are presented and discussed. From the photocurrent curves, the ratio I _PC (saturated photocurrent)/I _DC (dark current) was observed to be of the order of 10⁶ for the systems prepared with CdCl₂, and to be 10⁷ when doped with samarium nitrate. Values of trap depth E, lifetime and mobility are evaluated from the PC decay. Band gaps are determined from the two spectra. Diffraction lines in XRD studies are associated with CdS and PbS, and according to SEM studies, layered growth of the films takes place. PL of samarium-doped (Cd-Pb)S films shows an emission peak in the green-yellow region under 365-nm excitation. The PL brightness decreases with temperature.     

Nanolubrication of sliding components in adaptive optics used in microprojectors

Integrated microprojectors are being developed to project a large image on any surface chosen by the users. For a laser-based microprojector, a piezo-electric based adaptive optics unit is adopted in the green laser architecture. The operation of this unit depends on stick-slip motion between the sliding components. Nanolubrication of adaptive optics sliding components is needed to reduce wear and for smooth operation. In this study, a methodology to measure lubricant thickness distribution with a nanoscale resolution is developed. Friction, adhesion, and wear mechanisms of lubricant on the sliding components are studied. Effect of actual composite components, scan direction, scale effect, temperature, and humidity to correlate AFM data with the microscale device performance is studied.     

Liquid chromatographic separation and UV determination of certain antihypertensive agents

Three antihypertensive agents were extracted and isolated from commercial formulations. These were purified and characterized by melting point, lambdamax and IR. The percentage recovery by extraction process was in the range 81-91%. Active ingredients from binary formulations were separated by RP-HPLC using methanol-water (50:50 v/v) and by TLC using CHCl3-CH3OH (6:1) as mobile phase. Detection was by UV at 210 nm in HPLC, and by iodine vapors in TLC. The solvent conditions from TLC were transferred to open column chromatographic separation. Quantitative determination was carried out using TLC and column chromatography supplemented with UV spectrophotometry. Recovery was in the range 82-93%. Two combination of drugs, viz. amlodipine+ramipril and amlodipine+enalapril, were separated by the three modes of liquid chromatography. The percentage recovery was in the range 80-92% by open column.     

Light-directed maskless synthesis of peptide arrays using photolabile amino acid monomers

Novel photolabile amino acid monomers for photolithographic solid-phase peptide synthesis has been developed and a method for the maskless synthesis of individually addressable peptide microarrays using new building blocks has been described; these peptide microarrays are suitable for repetitive epitope-binding assays.     

Synthesis and Antimicrobial Activities of Novel 2‐[substituted‐1H‐pyrazol‐4‐yl] Benzothiazoles,Benzoxazoles, and Benzimidazoles

In an endeavor to find a new class of antimicrobial agents, a series of novel substituted benzimidazole, benzoxazole, and benzothiazole derivatives 6 containing pyrazole moiety have been synthesized by reaction of 3‐aryl‐4‐formyl pyrazole 4 with substituted phenylenediamine or o‐aminophenol or o‐aminothiophenol 5 . Reaction of phenyl hydrazine or 2‐hydrazinopyridine 1 with substituted acetophenones 2 gave the corresponding hydrazones 3 , which on Vilsmeier–Haack reaction with POCl₃–DMF gave substituted 3‐aryl‐4‐formyl pyrazoles 4 . All final compounds 6a , 6b , 6c , 6d , 6e , 6f , 6g , 6h , 6i , 6j , 6k were evaluated for in vitro antibacterial activities against Escherichia coli and Staphylococcus aureus strains and in vitro antifungal activity against Candida albicans and Aspergillus niger strains by using serial dilution method. The antimicrobial activities were expressed as the minimum inhibitory concentration in µg/mL. The compound containing benzimidazole and benzoxazole moiety gave better antibacterial and antifungal activities than benzothiazole compounds.     

Synthesis of novel fungicidal organomercurials using microwaves

Summary Mercury derivatives of substituted 1,3,4-thiadiazoles and 1,2,4-triazine have been synthesized under microwave irradiation in open vessels using a domestic microwave oven as well as in a conventional way. The reaction time could be cut down from hours to minutes employing microwaves, accompanied by marginally improved yields. The compounds show promising fungicidal activity.

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Mikrowellenunterstützte Synthese neuer fungizider Organoquecksilberverbindungen

Zusammenfassung Quecksilberderivate substituierter 1,3,4-Thiadiazole und 1,2,4-Triazine werden sowohl unter der Einwirkung von Mikrowellen (offene Gefäße, Haushaltsmikrowellenherd) als auch auf konventionelle Weise hergestellt. Die Anwendung von Mikrowellen verkürzt die Reaktionszeit von Stunden auf Minuten, die Ausbeuten steigen geringfügig. Die Verbindungen zeigen vielversprechende fungizide Aktivität.