Casting propellant in rocket engine

A method is described for casting a solid propellant in the casing of a rocket engine having a continuous wall with a single opening which is formed by leaves of a material which melt at a temperature of the propellant and with curved edges concentric to the curvature of the spherical casing. The leaves are inserted into the spherical casing through the opening forming a core having a greater width than the width of the single opening and with curved peripheral edges. The cast propellant forms a solid mass and then heated to melt the leaves and provide a central opening with radial projecting flutes

Police Perceptions and Parenting Styles Among Black Parents of Miami-Dade County

A person’s perception of something or someone does not develop without external factors affecting the individual. Experiences and lessons people have learned from a young age have molded their perception of the world. One of those lessons is what is considered correct and what is not. In the Black American community, this is accompanied by the “talk”. This “talk” is shaped by past experiences with the police towards minority groups, specifically, Black Americans. This paper discusses how parenting styles, race, and authority intersect. The purpose of this paper is to examine the beginnings of one’s life, the lessons they are taught, and how parenting has affected one’s view on authority

Les recours propres à l’hypothèque immobilière en common law

L’auteur a voulu faire une étude des recours propres à l’hypothèque immobilière afin de créer une charpente pour faciliter l’étude en français de la jurisprudence se rapportant aux autres aspects des règles de fond du droit hypothécaire tels que la nature des secondes hypothèques ou la vente du droit de rachat ou le classement des hypothèques. A cette fin, l’auteur a eu un souci tout particulier de s’assurer que les mots ou expressions proprement juridiques, façonnés pour exposer ce secteur du droit, rendent d ’une manière juste les concepts du droit anglais. L ’article consiste en une étude, d ’une part du droit de rachat qui constitue le recours fondamental du débiteur hypothécaire, et d’autre part, de l’action en forclusion, la vente judiciaire, la vente extrajudiciaire, l’action personnelle sur l’engagement et la prise de possession, qui représentent l’ensemble des recours ouverts au créancier hypothécaire

A study of ASRS reports involving general aviation and weather encounters

Consideration is given to the nature and characteristics of problems involving dissemination of weather information, use of this information by pilots, its adequacy for the purpose intended, the ability of the air traffic control system to cope with weather related incidents, and the various aspects of pilot behavior, aircraft equipment, and NAVAIDS affecting flights in which weather figures. It is concluded from the study that skill and training deficiencies of general aviation pilots are not major factors in weather related occurrences, nor is lack of aircraft equipment. Major problem causes are identified with timely and easily interpreted weather information, judgement and attitude factors of pilots, and the functioning of the air traffic control system

The absolute photometry of the zodiacal light

Absolute photometry of zodiacal ligh

Ultrasound increases the aqueous extraction of phenolic compounds with high antioxidant activity from olive pomace

Olive pomace is a waste produced by the olive oil industry in massive quantities each year. Disposal of olive pomace is difficult due to high concentrations of phenolic compounds, which is an environmental concern. However, phenolic compounds have applications in the health industry. Therefore, extraction of phenolic compounds from olive pomace has the potential to remove an environmentally hazardous portion of pomace while creating an additional source of income for farmers and producers. Using advanced technologies including Ultrasound Assisted Extraction (UAE), combined with water as an extraction solvent, has recently gained popularity. The present study outlines the optimal UAE conditions for the extraction of phenolic compounds with high antioxidant activity from olive pomace. Optimal conditions were developed using RSM for parameters power, time and sample-to-solvent ratio. Total phenolic compounds determined by Folin Ciocalteu method and total major bioactive compounds determined by HPLC as well as antioxidant capacity (DPPH and CUPRAC) were investigated. The optimal conditions for the extraction of phenolic compounds with high antioxidant activity were 2 g of dried pomace/100 mL of water at 250 W power for 75 min. UAE improved the extraction efficiency of water and yielded extracts with high levels of phenolic compounds and strong antioxidant activity

Relaxation Design of Separable Tube Connectors

Design procedure to predict relaxation or time to leakage for separable tube connector

A Terminal Area Analysis of Continuous Ascent Departure Fuel Use at Dallas/Fort Worth International Airport

Aircraft departing from the Dallas/Fort Worth International Airport (DFW) encounter vertical restrictions that prevent continuous ascent operations. The result of these restrictions are temporary level-offs at 10,000 feet. A combination of flow direction, specific Area Navigation (RNAV) route geometry, and arrival streams have been found to be the biggest factors in the duration and frequency of a temporary level-offs. In total, 20% of DFW departures are affected by these level-offs, which have an average duration of just over 100 seconds. The use of continuous descent approaches at DFW are shown to lessen the impact arrivals have on the departures and allow more continuous ascents. The fuel used in a continuous ascent and an ascent with a temporary level-off have been calculated using a fuel burn rate model created from a combination of actual aircraft track data, aircraft manufacturer flight operations manuals, and Eurocontrol's Base of Aircraft Data (BADA) simulation tool. This model represents the average aggregate burn rates for the current fleet mix at DFW. Continuous ascents would save approximately seven gallons of fuel out of 450 gallons used to climb to a cruise altitude of 31,000ft per departure