Neutrinos from Fallback onto Newly Formed Neutron Stars

In the standard supernova picture, type Ib/c and type II supernovae are powered by the potential energy released in the collapse of the core of a massive star. In studying supernovae, we primarily focus on the ejecta that makes it beyond the potential well of the collapsed core. But, as we shall show in this paper, in most supernova explosions, a tenth of a solar mass or more of the ejecta is decelerated enough that it does not escape the potential well of that compact object. This material falls back onto the proto-neutron star within the first 10-15 seconds after the launch of the explosion, releasing more than 1e52erg of additional potential energy. Most of this energy is emitted in the form of neutrinos and we must understand this fallback neutrino emission if we are to use neutrino observations to study the behavior of matter at high densities. Here we present both a 1-dimensional study of fallback using energy-injected, supernova explosions and a first study of neutrino emission from fallback using a suite of 2-dimensional simulations.Comment: 30 pages (including 10 figures), submitted to ApJ, comments welcom

\u3ci\u3eThe Center of the World\u3c/i\u3e

A body of water is often seen as a serene place of relaxation, but just under the surface, aquatic life bustle around. This creative narrative will spark your imagination into having you believe that you are placed in the shoes of a wandering student as you encounter this great entity, known as the Bryant Pond. This journey will allow you to free your mind, and let it wander as you get lost in your own imagination. Have you ever wondered how certain things came to be, such as out-of-place objects in an environment that could have naturalistically been put there, but has a very small probability of actually being real nature? The Bryant Pond is located at the center of the university campus, and is an eye-catcher as you meander around. The pond acts as a waypoint for students, allowing them to navigate the campus with ease. Surrounding the pond are various forms of the environment, ranging from trees, to grass, to weeds and reeds around the perimeter of the pond. Since the pond is a secluded area inside of the campus, how did aquatic marine life come to be in this sort of environment with no connecting bodies of water? This would allow nothing to get in or out, unless an outside factor was to come into play. Fish swim around in the pond, and that draws the question on how they got there since there are no bodies of water connecting. Birds could have been the primary individuals that caused the influx of these marine creatures through transporting eggs in their feathers, or us humans could have planted them there to reconstruct a replica pond. Knowing and “Understanding the way that fish are dispersed in remote bodies of water is important for the maintenance of biodiversity”[1], and it can expand the wildlife that lives on Bryant’s campus. Maybe the bigger question is, what relationship do we have with the environment, and what do we do to appreciate what it has provided for us? [1] “Dispersal of Fish Eggs by Water Birds – Just a Myth?” ScienceDaily. ScienceDaily, February 19, 2018. https://www.sciencedaily.com/releases/2018/02/180219103258.htm

Model based study of autothermal thermophilic aerobic digestion (ATAD) processes : a thesis presented in partial fulfilment of the requirements for the degree of Master of Technology in Engineering and Automation of Massey University

An Autothermal Thermophilic Aerobic Digestion process, or ATAD process, is a relatively new sewage sludge treatment process. The ATAD process has been developed for the disinfection and stabilisation of sewage sludge, which is a by-product of wastewater treatment. The end product can be applied to the land as a soil additive or fertiliser with no restrictions, as the process dramatically reduces public health and environmental risks. The process is comparable to the composting process used for municipal solid waste and garden wastes. The process requires oxygen, usually in the form of air, to be applied to the sludge by an aeration system. The oxygen stimulates an exothermic biochemical reaction, which in turn heats the sludge up to thermophilic temperatures (between 50 and 65°C). At these temperatures the pathogenic bacteria, viruses and parasites in the sludge that are harmful to human health are effectively destroyed. The biochemical reaction also degrades a large portion of the organic sludge, which means that unstable, volatile odour generating substances are removed; this reduces the likelihood of smells and the attraction of flies and rodents (vector attraction) to the sludge.[FROM INTRODUCTION

Induction powered biological radiosonde

An induction powered implanted monitor for epidurally measuring intracranial pressure and telemetering the pressure information to a remote readout is disclosed. The monitor utilizes an inductance-capacitance (L-C) oscillator in which the C comprises a variable capacitance transducer, one electrode of which is a small stiff pressure responsive diaphragm. The oscillator is isolated from a transmitting tank circuit by a buffer circuit and all electric components in the implanted unit except an input and an output coil are shielded by a metal housing

Low power electromagnetic flowmeter providing accurate zero set

A low power, small size electromagnetic flowmeter system is described which produces a zero output signal for zero flow. The system comprises an air core type electromagnetic flow transducer, a field current supply circuit for the transducer coils and a pre-amplifier and demodulation circuit connected to the output of the transducer. To prevent spurious signals at zero flow, separate, isolated power supplies are provided for the two circuits. The demodulator includes a pair of synchronous rectifiers which are controlled by signals from the field current supply circuit. Pulse transformer connected in front of the synchronous rectifiers provide isolation between the two circuits

Miniature telemetry system accurately measures pressure

Miniature, low power, telemetry system that can be used with commercially available strain gage pressure transducers accurately measures pressure with a small implantable pressure cell and transmitter. The system has been used to date only with pressure transducers, but the circuit is equally applicable to any measurement using a strain gage sensor

Miniature bioelectric device accurately measures and telemeters temperature

Miniature micropower solid-state circuit measures and telemeters the body temperature of laboratory animals over periods up to two years. The circuit employs a thermistor as a temperature sensing element and an fm transmitter. It is constructed from conventional discrete components or integrated circuits