Minimizing the modal vibration induced by on-off thrusters is a challenging problem for designers of flexible spacecraft. This thesis presents the first study of PulseWidth, Pulse-Frequency (PWPF) modulated thruster control using the method of command input shaping. Input shaping for systems with linear actuators has been successfully developed to reduce modal vibrations. Recently, this method ...

Kinetic kill vehicle (KKV) is actuated by on-off thrusters to adjust its attitude, how to modulate continuous control commands to on-off or pulse signals to meet the requirements of the thrusters is a challenging task. Pulse-width pulse-frequency (PWPF) modulation is an effective method that provides pseudolinear operation for on-off thrusters. In this work, a new thruster configuration of the ...

We present an improved methodology for a thermal transient method enabling simultaneous measurement of thermal conductivity and specific heat of nanoscale structures with one-dimensional heat flow. The temporal response of a sample to finite duration heat pulse inputs for both short (1 ns) and long (5 ls) pulses is analyzed and exploited to deduce the thermal properties. Excellent agreement has...

Gastric electrical stimulation (GES) involves the delivery of electrical impulses to the stomach for therapeutic purposes. New GES protocols are needed that are optimized for improved motility outcomes and energy efficiency. In this study, a biophysically based smooth muscle cell (SMC) model was modified on the basis of experimental data and employed in conjunction with experimental studies to ...

Nickel-vanadium (NiV)-layered double hydroxide (LDH) was fabricated into a novel saturable absorber (SA) by the liquid phase exfoliation method and utilized as laser modulator for first time, to our best knowledge. We investigated passive Q -switched Tm:YAG ceramic at 2 µm with NiV-LDH SA. Un...

Abstract In this research, a diode‐pumped SnS 2 passively Q‐switched (PQS) V‐type Tm‐doped pulsed laser was demonstrated. The continuous‐wave (CW) condition without saturable absorber (SA) investigated first. A maximum output power of 1.26W with slope efficiency 24.28% derived at an absorbed pump 7.11W under coupling 5%. With the as‐prepared SA employed, series stable (QS) pulse trains were suc...

1. By recording eye movements with the search coil technique and subjecting them to an accurate infinite Fourier transform algorithm, we describe the Fourier spectra of human and monkey saccades. In both species we find heretofore undescribed features consisting of a regular pattern of local minima in the power plot, which cannot be attributed to noise. The frequency of these minima is well cor...