Under starvation conditions, a swarm of Myxococcus xanthus cells will undergo development, a multicellular process culminating in the formation of many aggregates called fruiting bodies, each of which contains up to 100,000 spores. The mechanics of symmetry breaking and the self-organization of cells into fruiting bodies is an active area of research. Here we use microcinematography and automat...

In this paper, reduced power consumption, low-noise CMOS amplifier using chopper technique is designed, chopper-equalized amplifier had been used as a front end of a voltage-to-frequency converter instrument which performs pretty well, and they were meeting just about every specification, but they had a problem with undesired and unpleasant little offset shifts and jumps. Trying to solve this p...

This paper proposes a resonant dc link in PWM ac chopper. This can solve the spike problems and also reduce the switching loss. The configuration and PWM pattern of the proposed technique are presented. The simulation results are used to confirm the theory. Keywords—PWM ac chopper and Resonant dc link.

This paper presents a chopper instrumentation amplifier for interfacing precision thermistor bridges. For high CMRR and DC gain, the amplifier employs a three-stage current-feedback topology with nested-Miller compensation. By chopping both the input and intermediate stages of the amplifier, a 1 mHz noise corner was achieved at an input-referred noise power spectral density (PSD) of 15 nV/ Hz. ...

The aim of the present study was to test the effect of the interval of serial sections in the tissue chopper on the number of isolated ovine preantral follicles. Best results were obtained when the ovarian fragments were cut in the tissue chopper at interval of 87.5µm (1592 preantral follicles per treatment). Histochemical analysis showed that the follicular morphology was preserved after mecha...

A technique for selecting the element values of the PWM AC chopper circuits to improve the input power factor is presented. This technique analyzes the phase angles of input current, output current and voltage for selecting the optimal value of the filter capacitance. This produces the phase angle of input current in phase with that of input voltage. Therefore, the PWM AC chopper can operate at...

To successfully follow a velocity profile, a motor and drive combination must generate enough torque to: accelerate the load inertia at the desired rates, and drive the load torque at the desired speeds. While the size of a bipolar stepper motor generally dictates the low speed torque, the ability of the drive electronics to force current through the windings of the motor dictates the high spee...

In chopper amplifiers, the interaction between input signal and clock can give rise to intermodulation distortion (IMD). This chopper-induced IMD is mainly due amplifier delay, which causes large pulses at output of amplifier’s chopper. article proposes use a so-called fill-in technique eliminate these pulses, thus resulting IMD, by multiplexing outputs two identical amplifiers that are chopped...

This study focuses on the loss of inductors in a multiphase bidirectional chopper, which is DC-DC conversion system. The current at chopper consists DC equivalent to load and an AC called ripple current. discussion regarding effect increased number phases should include due current, caused by semiconductor switching. Therefore, this clarifies from experiment with increase temperature. From extr...

In order to reduce the chopping power consumption of a flat hob chopper (referred herein as chopper) on premise ensuring effect chopper, mathematical model optimal design is established in this paper with minimum objective. With help MATLAB software, solved. The curves each point blade edge line before and after optimization structural parameters are generated. results indicate that when coordi...