We present the most relevant works on jet engine design that utilize thermodynamic cycle of detonative combustion. The efficiency advantages of thermodynamic detonative combustion cycle over Humphrey combustion cycle at constant volume and Brayton combustion cycle at constant pressure were demonstrated. An ideal Ficket-Jacobs detonation cycle, and…

In this article we reviewed the shock wave oscillation that occurs when supersonic flows interact with conic, blunt or flat nose of aircraft, taking into account the aerospike attached to it. The main attention was paid to the problem of numerical modeling of such oscillation, flow regime classification, and cases where aerospike attachment can…

With the opening of additional trade partnerships, the reduction of global transportation and communication costs, and the increase in demand for U.S. agricultural products and services, international trade is an area of great importance to more and more Extension clients and stakeholders. This article provides information about the primary…

Although there is great interest in attracting talented and underrepresented individuals into public-sector careers, there is also concern that graduates of colleges and universities may not be considering the public sector and that government agencies are not doing all they could to attract the next generation of workers. This report seeks to…

This set of tables introduces new data for national and state-level public elementary and secondary revenues and expenditures for fiscal year (FY) 2019. Specifically, this report includes the following school finance data: (1) revenue and expenditure totals; (2) revenues by source; (3) expenditures by function and object; (4) current expenditures;…

This report is the latest in a series of studies by the Center for an Urban Future focused on building a more inclusive economy in New York. It is informed by interviews with over 50 experts in college persistence and basic needs access--including staff at community-based organizations (CBOs), faculty and administrators at the City University of…

The need to invest in our nation's crumbling infrastructure goes back decades. But today, with millions of people unemployed, there is unprecedented momentum to act. Women, immigrants, and people of color are disproportionately represented in these numbers as are young adults. President Joe Biden and Congress are counting on infrastructure…

Community colleges have started to support students' basic needs in multiple ways. Campus-based hubs offering services like public benefits access, emergency aid, food pantries and case management have become increasingly popular. However, limited evidence exists on whether connecting with these hubs improves academic success. The Advocacy and…

Rates of human papillomavirus (HPV) vaccine series completion among adolescent Hispanic females in Texas in 2014 (~39%) lag behind the Healthy People 2020 goal (80%). This qualitative study identifies Hispanic mothers' salient behavioral, normative and control beliefs regarding having their adolescent daughters complete the vaccine series.…

Researchers, policymakers, and practitioners have recently aligned efforts to reduce school absenteeism, particularly during kindergarten when excessive absences are highest out of all elementary grades. Little is known, however, about whether the way in which students get to school might influence if they go to school. To address this gap, this…

Drones, unmanned aerial vehicles (UAVs), usually helicopters or airplanes, are commonly used for warfare, aerial surveillance, and recreation. In recent years, drones have become more accessible to the public as a platform for photography. In this report, we explore the use of drones as a new technological filming tool to enhance student learning…

The information which this article wishes to clarify is the teachers' perception of truancy. The objective of this study, using an exploratory field research, with quantitative treatment, is to analyze the levels of perception of primary school teachers in rural areas in Cabinda regarding school absenteeism, causes and measures of overcoming this…

The use of narrative bits--narbs--has been discussed as an alternative means of looking at opinions of those who are producing narbs, for instance, in the form of tweets. The American carrier, United Airlines, came under media attention in April 2016 when a passenger was forcibly removed from a flight. This resulted in a spike in tweets around the…

In 2007, the U.S. Department of Education commissioned WestEd to develop a guide on using quality authorizing to promote high-quality charter schools. At the time, notions about how authorizers could contribute to the existence of such schools were in their infancy, and the publication, which profiles the oversight practices of eight selected…

The current study explores possible incentives and disincentives among Greek secondary school and university students for using public transport. A 24-items questionnaire was used to elicit the beliefs of 913 students. Collected data was subjected to significance testing through t-test and Mann-Whitney U-test, depending on the significance of the…