Hypersonic propulsion research

The development of technology for the modular airframe integrated scramjet has been the focus of hypersonic propulsion research for several years. An part of this research, a variety of inlet concepts have been explored and characterized. The emphasis of the inlet program has been the development of the short (light weight), fixed geometry, side wall compression inlets that operate efficiently over a wide Mach number range. As hypersonic combustion tunnels were developed, programs to study the parameters controlling fuel mixing and combustion with single and multiple strut models were conducted using direct connect test techniques. These various tests supported the design of subscale engine test hardware that integrated inlet and combustor technology and allowed the study of the effect of heat release on thrust and combustor/inlet interaction. A number of subscale engine tests have shown predicted performance levels at Mach 4 and 7 simulated flight conditions. A few of the highlights from this research program are summarized

Hypersonic propulsion research

The NASA Langley Research Center has conducted hypersonic propulsion research since the 1960s. A variety of inlet concepts were explored and characterized. The emphasis of the inlet program was the development of the short (light weight), fixed geometry, side-wall-compression inlets that operate efficiently over a wide Mach number range. As hypersonic combustion tunnels were developed, programs to study the parameters controlling fuel mixing and combustion with single and multiple strut models were conducted using direct connect test techniques. These various tests supported the design of subscale engine test hardware that integrated inlet and combustor technology and allowed the study of the effect of heat release on thrust and combustor/inlet interaction. A number of subscale engine tests have demonstrated predicted performance levels at Mach 4 and 7 simulated flight conditions

Effects of propellant composition variables on acceleration-induced burning-rate augmentation of solid propellants

This work was conducted to define further the effects of propellant composition variables on the acceleration-induced burning rate augmentation of solid propellants. The rate augmentation at a given acceleration was found to be a nonlinear inverse function of the reference burning rate and not controlled by binder or catalyst type at a given reference rate. A nonaluminized propellant and a low rate double-base propellant exhibited strong transient rate augmentation due to surface pitting resulting from the retention of hot particles on the propellant surface

Comparison of Attitudes Between Premaritally Pregnant Couples and Non-Premaritally Pregnant Couples

Clinical practitioners have indicated a concern for couples who have married because of pregnancy. Some would suggest that whatever relationship problems brought them in for counseling can often be traced back to unresolved feelings about the reason for marriage. These feelings and the marriage option following pregnancy frequently become the focus in marriage counseling. Often, when these feelings and attitudes remain unresolved, divorce or discontinuance of the relationship follows

Improving Patient Access to Gastroenterology Through a Nurse-Practitioner-Led Clinic: A Quality Improvement Project

The United States has a critical healthcare access issue for gastroenterology patients. Delays in treatment can lead to expensive complications, including emergency room visits, hospitalization, and surgery. Creating a rapid-access clinic (RAC) for gastroenterology so that patients can obtain a quick and efficient evaluation of their symptoms in a shorter appointment time can help decrease the delay in care and generate more revenue for the hospital. Over 8 weeks in 2023, Dartmouth Hitchcock Medical Center Department of Gastroenterology used a telemedicine-only RAC to see patients for 20 minutes rather than the traditional 60-minute period. As a result, the RAC saw more new patients in 1 day than a provider usually sees per week. Patients benefited from being seen in a faster amount of time. Additionally, the clinic generated a significant revenue increase due to timely patient test ordering. Thus, an RAC could be an effective, life-saving measure for gastroenterology patients by helping to manage the healthcare shortage

Colorectal cancer : a neuropsychological approach to non-adherence to screening guidelines of individuals with Lynch syndrome in the Western Cape

Includes abstract.Includes bibliographical references (p. 116-140).Lynch syndrome (LS), the most common form of inherited colorectal cancer (CRC), carries with it a lifetime risk of approximately 80% of developing CRC. This study identified unexpected findings with regard to the relationships between neuropsychological functioning, knowledge and non-adherence within the context of LS, and highlights ways in which this might be investigated in the future

We’re Going Live When?! Implementing Digital Commons at Texas A&M University-Commerce

Texas A&M University-Commerce implemented Digital Commons as their institutional repository in Summer 2021. This is the first institutional repository launched at our university. The Implementation Committee divided into two groups, Scholarly Communications and Special Collections and University Archives, and each had unique needs and requirements. This included developing an organizational structure, workflows, creating policies, usage permissions, and identifying content. This was a complex project for our small staff, but we were able to launch successfully by our deadline. This session focuses on the most important decisions made in order to launch Digital Commons in under a month. We will discuss our implementation workflows, processes and challenges that were met. We will wrap up by discussing what worked and what did not work