We report on a 50 ksec XMM-Newton observation of the double pulsar system J0737–3039 performed on April 2004. We present results of the spectral analysis of these data combined with the much shorter Chandra pointing performed on January 2004. Black body emission with effective temperature of 0.20 −0.02 keV (90% confidence level) and emission radius 75 +30 −9 m for a distance of 0.5 kpc (implyin...

Block and stream ciphers are widely used to protect the privacy of digital informa-tion. A variety of attacks against block and stream ciphers exist; the most recentbeing the algebraic attacks. These attacks reduce the cipher to a simple algebraicsystem which can be solved by known algebraic techniques. These attacks havebeen very successful against a variety of stream ciphers a...

The recovery of high-quality, valuable end products from cheese whey is a very important industrial process. The aim of this study is to improve the recovered protein content of concentrate stream in cheese whey. The experiments were conducted by using ceramic ultrafiltration (UF) membrane followed by diafiltration (DF) process with a 15kDa molecular weight cut-off (MWCO). The volume concentrat...

well-designed lighting decreases accidents and diseases of eyes and can increase productivity and concentration. increase of energy price and a high proportion of electric lighting energy consumption in buildings due to defects in designing and maintenance led to desirable lighting to be reduced. one of our challenges in providing health and quality of lighting is lack of economic justification...

| In the cryptanalysis of stream ciphers and pseudorandom sequences, the notions of linear, jump, and 2{adic complexity arise naturally to measure the (non)randomness of a given string. We de ne an isometry K on Fq that is the precise equivalent to Euclid’s algorithm over the reals to calculate the continued fraction expansion of a formal power series. The continued fraction expansion allows to...

We consider the minimization of transmit power subject to rate-demand and resource constraints of a cognitive radio (CR) multi-input multi-output (MIMO) network under the framework of a noncooperative game. With spatial multiplexing over each frequency band, a multi-antenna node controls its antenna radiation directions and allocates power for each data stream by appropriately adjusting its pre...

Electricity generation in thermal power plants as the largest producer of electricity in Iran is associated with greenhouse gas emissions. In this paper, using the Malmquist-Luenberger method, green productivity, and efficiency changes are measured for 31 thermal power plants (including 12 steam power plants, 13 gas power plants, and six combined cycle power plants) during 2009-2016. The result...

the investigation at water quality of kelaroud river by hfbi (hilsenhoff’s family–level biotic index) method. in this research task to the water quality of kelaroud river using biotic index hfbi and identifying the society of macroinvertebrates upon level of the family. result of this index with other index compared: ept/ chironomidae, .this task was achieved with in the year 1389-90 with takin...

Given the substitution process of generators using renewable energy sources instead of conventional generators in modern power systems, this paper proposes a Monte Carlo based method to determine an optimal level of this change. At first, LOLE index of the system was calculated without wind power to obtain the reference index. Then, the wind turbine units are replaced with the conventional gene...