Scattering by a uniformly translating sphere of pulse that modulates the amplitude linearly polarized plane wave was formulated using frame-hopping method involving laboratory inertial reference frame and sphere's comoving frame. The incident signal defined in transformed to with Lorentz transformation, thereby altering signal's spectrum, direction propagation carrier wave, electric field, depending on velocity. In frame, Fourier-transformed frequency domain, scattered field phasors were...

Electrical discharge (plasma)-based analytical instruments are commercially available. These include the inductively coupled plasma atomic emission spectrometer (ICP-AES), ICP-mass (MS), gas chromatograph/microwave-induced (MIP) AES, glow-discharge MS, direct-current and ICP fluorescence (ICP-AFS). High-temperature inert-gas plasmas believed to be excellent sources for excitation spectrometry—namely, emission, ionization mass spectrometry. The success of ICP-AFS, however, indicates that...

The energy absorption and extinction cross sections of an object in uniform translational motion free space are Lorentz invariant, but the total scattering section is not. Indeed, forward-scattering theorem holds true for comoving observers not other inertial observers. If a pulsed plane wave with finite density incident upon object, energies scattered, absorbed, removed from signal by finite. difference between sum non-comoving observer can be either negative or positive, depending on...

Abstract It is commonly known that human errors whilst undertaking safety critical tasks (SCTs) has been a significant contributory factor in number of major incidents the O&G industry (e.g. Deepwater Horizon, Texas City, Piper Alpha, etc). This paper will discuss Safety Critical Task Analysis (SCTA) methodology as way to proactively identify and review factors affecting safe effective completion SCTs. The involves determining which are critical, developing priority listing SCTs for...

<title>ABSTRACT</title> <p>This paper will discuss a hybrid approach for antenna placement optimization on tactical vehicles. Tactical vehicles tend to have collocated antennas that operate in adjacent frequency bands. It may be required two simultaneously satisfy wide range of voice and data capabilities. The current process optimize the location platforms involves longer test times, complicated logistics, high costs, is usually performed an uncontrolled environment. In...

Humans will launch spacecraft that travel at an appreciable fraction of the speed light. Spacecraft traffic be tracked by radar. Scattering pulsed electromagnetic fields object in uniform translational motion relativistic may computed using frame-hopping technique. Pulse scattering depends strongly on velocity, shape, orientation, and composition object. The peak magnitude backscattered signal varies many orders magnitude, depending whether is advancing toward or receding from source...

This paper addresses the problem of fast learning radar detectors with a limited amount training data. In current data-driven approaches for detection, re-training is generally required when operating environment changes, incurring large overhead in terms data collection and time. contrast, this proposes two novel deep learning-based that enable adaptation based on few samples from new environment. The proposed methods integrate prior knowledge regarding previously encountered environments...

Negative refraction through a triangular prism may be explained without assigning negative refractive index to the by using array theory. For case of beam incident upon wedge, theory accurately predicts transmission angle and provides an estimate frequency interval at which occurs. effects not only occur in prisms made traditional metamaterial unit cells, such as magneto-dielectric spheres, but also solid completely filled, homogenous cells. In both prisms, hypotenuse has staircase shape...

In this new era of space exploration, a host launch vehicles are being examined for possible use in transporting cargo and crew to low Earth orbit beyond. Launch derived from the Space Shuttle Program (SSP), known as Derived Vehicles (SDVs), prime candidates heavy-lift duty because their potential minimize non-recurring costs can leverage off proven high-performance flight systems with established ground support. To determine merits SDVs, detailed evaluation was performed. This included...

Frequency-agile wideband radios may be susceptible to non-linear effects from strong electromagnetic signals coupled co-site or nearby emitters. Also, such can impact spectrum sensing capability of Dynamic Spectrum Access (DSA) systems. Therefore, it is important understand the characteristics coupling channel between systems due Line-of-Sight (LOS) propagation and reflections objects, as buildings in urban environment hills rural environment. The presence objects cause significant...

This paper considers slotted ALOHA networks in Weibull fading channels. A simplified signal capture model is used to analyze both probability and throughput of the protocol.

The mission success and safety of aerospace vehicles present unique weather support challenges. While requirements to ensure the safe processing, launc h, landing these have been continuously reviewed improved since first successful missile launch at Cape Canaveral in July 1950, this paper only addresses Space Shuttle. describes Shuttle from time its approval by President Nixon 1972 through Columbia's accident 2003 Return -to -Flight 2005 , a period more than 30 years. focuses on three...

Radars often use correlation of received signals with transmitted to identify targets. However, when a target translates at high uniform speed, the and depends strongly on target's velocity, even after two-way Doppler shift has been removed. This is true whether made highly dispersive material or not.

This paper addresses the problem of continual learning radar detectors from sequentially provided training data. Given a limited number labeled samples for each tasks in certain class, model-agnostic meta-learning (MAML) approach is developed to enable few-shot new task class. In detection problem, associated with set specific environmental conditions such as target, clutter or interference properties. The proposed detector design separated into two stages: meta-training stage and an...

This paper addresses the problem of fast learning radar detectors with a limited amount training data. In current data-driven approaches for detection, re-training is generally required when operating environment changes, incurring large overhead in terms data collection and time. contrast, this proposes two novel deep learning-based that enable adaptation based on few samples from new environment. The proposed methods integrate prior knowledge regarding previously encountered environments...

Despite pharmaceutical systems being fundamental to successful antimicrobial stewardship (AMS) programmes they are currently neglected and undervalued. Research investment into system optimisation integration AMS presents an opportunity for countries, both high-income countries (HICs) low- middle-income (LMICs), develop responsible, comparable global innovations interventions.