The vulnerability of civil GPS receiver to interference may be intentional or unintentional. Among all types of interference, replay attack intended as the most dangerous intentional one. The signal structure of replay attack is almost the same with the satellite signal. The interference effects can be reduce with the design of an appropriate filter in the receiver. This paper presents two meth...

this paper presents a novel microstrip low-pass filter with good performance. a complete detailed theoretical analysis for the proposed filter is given using equivalent circuit models. the proposed filter applying multiple cascaded modified radial stubs resonators provides a sharp cut off frequency response that has a 185 db/ghz roll off rate. also, u-shaped attenuators provide a wide stop-band...

Four five-skin alkaloid extracts of the Madagascan poison frog Mantella baroni from three disturbed collection sites were compared with four five-skin extracts from three undisturbed sites. The number of alkaloids (diversity) was significantly different in M. baroni between undisturbed and disturbed collection sites, with more alkaloids generally being found in frogs from disturbed sites. Two u...

in order to compare sampling efficiencies of total and inhalable dust methods, three airborne dust sampling systems , 7-hole sampler , close and open face filter cassette were compared side-by-side , as stationary and for the personal samplers , in a wood working industry to evaluate their relative efficiency. a total of 162 samples were collected. the study of particle size distribution by cas...

Products 3D35 produced by PT. Team Metal Indonesia uses CNC machines, through two main processes, roughing process and finishing process. The problem faced is reject due to the remnants of piece (chips). Chips stick 1 mm chuck collect gap, causing product not be perfectly attached collect, which tilted or in middle position. To solve this problem, it necessary modify adding a gap with width 10 ...

Abstract This paper, on the basis of error modelling, proved optimal pocket machining sequences a simply end supported pocketed beam using mathematic induction method. The sequence with minimum floor height is from both ends to middle and not unique because symmetric supports about central plane; meanwhile, wall position fixed free unique. A Al7075 (744 mm in length, 172 width, 100 thickness ) ...

Abstract As compared to traditional milling, ultrasonic-assisted cutting of honeycomb core materials has the advantages small force and superior surface quality. Currently, ultrasonic straight blade V-shaped machining is one most efficient roughing processes. The requirement a processing path be post-processed based on characteristics cutter key issues faced while meeting technological requirem...

this paper presents an innovative active power filter design method to simultaneously compensate the current harmonics and reactive power of a nonlinear load. the power filter integrates a passive power filter which is a rl low-pass filter placed in series with the load, and an active power filter which comprises an rl in series with an igbt based voltage source converter. the filter is assumed...

The process of thermo-mechanically controlled rolling in the conditions Steckel mill Ferriera Valsider plant was developed for first time hot-rolled coils sizes 12 mm × 1510 from steel X65 grade further production electric welded pipes according to API-5L standard. provides carrying out roughing-rolling two stages facilitating forming a smaller austenite grain and therefore more dispersed homog...