Abstract In this research, an effect of low temperature on the mechanical properties and microstructure 6061-T6 aluminium alloy (AA6061-T6) subjected to static dynamic loading was investigated systematically. The specimens were compression at − 80°C in a range strain rates from 0.001 0.1 1/s under conditions, 1250 3400 conditions compare their responses. deformation mechanisms discussed based E...

Photophoretic trapping-Raman spectroscopy (PTRS) is a new technique for measuring Raman spectra of particles that are held in air using photophoretic forces. It was initially demonstrated with Raman spectra of strongly-absorbing carbon nanoparticles (Pan et al. [44] (Opt Express 2012)). In the present paper we report the first demonstration of the use of PTRS to measure Raman spectra of absorbi...

Electro-optical (EO) stabilized platforms have been widely used for surveillance and reconnaissance on various types of vehicles, from surface ships to unmanned air vehicles (UAVs). EO stabilized platforms usually consist of an assembly of structure, bearings, and motors called gimbals in which a gyroscope is installed. EO elements such as a CCD camera and IR camera, are mounted to a gimbal, wh...

We present statistical analysis of blocks in the binary expansions of Feigenbaum constants a and d for the logistic map. The analysis is carried out on both 1016 and 3400 bit expansions. A w test is applied for lumping data and a serial test is applied on gliding data. Contrary to a previous research by Karamanos and Kotsireas, our test results did not indicate any evidence to reject randomness...

From Penn Spine Research Group, University of Pennsylvania Health System, Department of Rehabilitation Medicine, Philadelphia, Pennsylvania. *Dr. Bhagia and Dr. Gilchrist are fellows at the Penn Spine Center. **Dr. Siegelman is an associate professor of radiology and chief of the MRI section of the University of Pennsylvania Health System. #Dr. Slipman is the director of the Penn Spine Center, ...

Astrophysics, Cosmology & Gravitation and Department of Mathematics & Applied Mathematics, University of Cape Town, Cape Town 7701, South Africa; 4 Department of Physics, University of Michigan, Ann Arbor, MI 48109-1040, USA; 5 Université de Genève, Département de Physique Théorique and CAP, CH-1211 Genève 4, Switzerland; 6 African Institute for Mathematical Sciences, Cape Town 7945, South Afri...

Using an optimized KOH activation procedure we prepared highly porous graphene scaffold materials with SSA values up to 3400 m(2) g(-1) and a pore volume up to 2.2 cm(3) g(-1), which are among the highest for carbon materials. Hydrogen uptake of activated graphene samples was evaluated in a broad temperature interval (77-296 K). After additional activation by hydrogen annealing the maximal exce...

The present study investigated a bandwidth extension method to enhance telephone speech understanding for cochlear implant (CI) users. The acoustic information above telephone speech transmission range (i.e., 3400 Hz) was estimated based on trained models describing the relation between narrow-band and wide-band speech. The effect of the bandwidth extension method was evaluated with IEEE senten...

Fig. 1 shows the FTIR spectra of GA, AGA-PEG and AGA-PEG-ST. In the spectra of GA, the absorption peaks at 3450 cm-1, 2947 cm-1 and 1650 cm-1 are associated with hydroxyl bonds and alkene bonds of GA, respectively. The broad peak appearing between 3400 and 2500 cm-1 and the peak at 1720 cm-1 are respectively contributed to O-H bonds and carbonyl bonds in carboxylic acid. In the spectra of AGA-P...

In this paper, we obtain some results on the nonoscillatory behaviour of the system (1), which contains as particular cases, some well known systems. By negation, oscillation criteria are derived for these systems. In the last section we present some examples and remarks, and various well known oscillation criteria are obtained. Universidad de la Cuenca del Plata Lavalle 50 (3400) Corrientes Ar...