analysis of time series data can involve the inversion of large covariance matrices. for theclass of arma (p, q) processes there are no exact explicit expressions for these inverses, except for thema (1) process. in practice, the sample covariance matrix can be very large and inversion can becomputationally time consuming and so approximate explicit expressions for the inverse are desirable.thi...

in this research, active capacitance circuit and the feature of negative resistance are analysed in details. also, a new active filter is presented based on active capacitance circuit. for simulations, we used matlab and advanced design system(ads). proposed active filter (rf) is a narrow band filter. the results of simulation shows some aspects of sustainability and low noise feature. the circ...

We theoretically analyze the nonlinear phase shifts induced by cascaded χ:χ processes in1-D photonic band gap (PBG) structures. We find that the enhancement of the density of modes near the band edge, coupled with a suitable choice of relative phase mismatch, leads to a new remarkable effect: the relative phase shift of the fundamental field upon transmission can be of order π over a distance o...

background: the critical role of interleukin-7 (il-7) in homeostatic proliferation and t cell survival has made it a promising cytokine for the treatment of various clinical conditions, especially those associated with lymphopenia. methods: in the present study we expressed recombinant human interleukin-7 (rhil-7) in chinese hamster ovary (cho)-k1 cells. cho-k1 cells were stably transfected wit...

5. Abstract Using results of the band structure calculations in the local-spin-density approximation we demonstrate how the crystal distortions affect the magnetic structure of orthorhombically distorted perovskites leading to a non-collinear spin arrangement. Our results suggest that the non-collinearity of the spin magnetic moments, being generally small in LaMO 3 series with M=Cr-Fe, is larg...

The Mars Global Surveyor (MGS) spacecraft, launched on November 7, 1996, carries an experimental space-to-ground telecommunications link at 32 GHz (Ka-band) along with the primary 8.4-GHz (X-band) downlink used for operational MGS project activities. The signals are simultaneously transmitted from a 1.5-m-diameter parabolic antenna on MGS and received by 34-meter beamwaveguide (BWG) antennas lo...

A compact ultra-wide-band (UWB) band-pass filter (BPF) with dual notch bands is presented using novel defected ground structures (DGS). A couple of triangle-ring resonators with four open-stubs fed by a couple of inter-digital coupled structures is developed to meet the UWB requirement of a uniform 3.1GHz to 10.6GHz full-band transmission response. Dual notch bands are generated for filtering o...

INTRODUCTION Laparoscopic adjustable gastric banding is an effective and safe surgical modality for the treatment of morbid obesity. Erosion of the band into the stomach has been reported. No reports are available on erosion of the Lap-Band following diverticulitis of the colon. CASE REPORT A 31-year-old female with a body mass index (BMI) of 52 underwent an uneventful laparoscopic Lap-Band p...