This paper presents behavioral modeling of an envelope tracking (ET) power amplifier (PA) excited by an slewrate limited envelope. In order to relax the slew-rate requirements of current efficient envelope amplifiers (EA), we can drive the ET PA with a slower version of the signal’s envelope. However, the resulting amplified signal suffers from nonlinear distortion due to the time-variant gain ...

Abstract We conduct one-dimensional stellar evolution simulations of red supergiant (RSG) stars that mimic common envelope (CEE) and find the inner boundary convective zone moves into initial radiative zone. The convection practically disappears only when RSG radius decreases by about an order magnitude or more. implication is one cannot split CEE stage during which companion spirals-in inside ...

The goal of this paper is to introduce the approximated convex envelope of a function and to estimate how it differs from its convex envelope. Such a problem arises in various physical situations where the function considered is some energy that has to be minimized.This study is a first step toward understanding how to approximate the quasi-convex envelope of a function. The importance of this ...

We conducted one-dimensional stellar evolutionary numerical simulations to build blue supergiant models with a very low-envelope mass and super-Eddington luminosity of 10^7Lo that mimic the last phase common envelope evolution (CEE) where neutron star (NS) accretes from launches jets power system. Common supernovae (CEJSNe) are CEE transient events NS spirals-in inside then core red (RSG) event...

The goal of this paper is to introduce the approximated convex envelope of a function and to estimate how it differs from its convex envelope. Such a problem arises in various physical situations where the function considered is some energy that has to be minimized.This study is a first step toward understanding how to approximate the quasi-convex envelope of a function. The importance of this ...

in some climates, massive buildings made of stone, masonry, concrete, earth and … can be utilized as one of the simplest and most effective ways of reducing building heating and cooling loads. very often such savings could be achieved in the design stage of the building and with a relatively low-cost. such declines in building envelope heat losses combined with optimized material configuration ...

The nuclear envelope is not only important for the structural integrity of the nucleus, but also involved in a number of cellular functions. It has been shown to be important for maintaining and controlling chromatin organization, sequestering transcription factors, replication, transcription and signalling. The nuclear envelope is thus important for development and differentiation, and some of...

After explaining the well-known two-envelope ‘paradox’ by indicating the fallacy involved, we consider the two-envelope ‘problem’ of evaluating the ‘factual’ information provided to us in the form of the value contained by the envelope chosen first. We try to provide a synthesis of contributions from economy, psychology, logic, probability theory (in the form of Bayesian statistics), mathematic...

The human visual sensitivity to sinusoidal flickering light is generally band-pass tuned to temporal frequency, probably due to retinal physiological properties consist of low-pass and following high-pass filtering processes. It is also shown that the temporal sensitivity of visual cortex has a band-pass shape. Meanwhile, for the flickering lights with two or more frequency components, flicker ...