Flight investigation of installation effects on a plug nozzle with a series of boattailed primary shrouds installed on an underwing nacelle

Several variations of a boattailed shroud for a 10 deg conical plug nozzle were tested using an F-106B aircraft for Mach 0.6 to 1.3. The data were obtained so that the tradeoff between boattail and plug size could be studied for an underwing nacelle location. The nozzles were tested with J85-GE-13 turbojet engine, and the data were compared to previous flight results of installed plug nozzles. Boattail area varied from 31 to 66 percent of the nacelle area. The effect of increasing projected boattail area was to increase the gross thrust coefficient in the same way as from isolated data for flight Mach numbers below 0.85. The highest gross thrust coefficient (0.958) was obtained at Mach 0.95 with a long circular arc shroud configuration with a very small amount of secondary air flow

Computer program determines thermal environment and temperature history of lunar orbiting space vehicles

Program computes the thermal environment of a spacecraft in a lunar orbit. The quantities determined include the incident flux /solar and lunar emitted radiation/, total radiation absorbed by a surface, and the resulting surface temperature as a function of time and orbital position

Hot-flow tests of a series of 10-percent-scale turbofan forced mixing nozzles

An approximately 1/10-scale model of a mixed-flow exhaust system was tested in a static facility with fully simulated hot-flow cruise and takeoff conditions. Nine mixer geometries with 12 to 24 lobes were tested. The areas of the core and fan stream were held constant to maintain a bypass ratio of approximately 5. The research results presented in this report were obtained as part of a program directed toward developing an improved mixer design methodology by using a combined analytical and experimental approach. The effects of lobe spacing, lobe penetration, lobe-to-centerbody gap, lobe contour, and scalloping of the radial side walls were investigated. Test measurements included total pressure and temperature surveys, flow angularity surveys, and wall and centerbody surface static pressure measurements. Contour plots at various stations in the mixing region are presented to show the mixing effectiveness for the various lobe geometries

A morphologic study of Venus Ridge belts

Ridge belts, first identified in the Venera 15/16 images are distinguished as linear regions of concentrated, parallel to anastomosing, ridges. They are tens to several hundreds of km wide, hundreds to over one thousand km long, and composed of individual ridges 5 to 20 km wide and up to 200 km long. The ridges appear symmetrical in the radar images and are either directly adjacent to each other or separated by mottled plains. Cross-strike lineaments, visible as dark or bright lines, are common within the ridge belts, and some truncate individual ridges. In places the ridge belt may be offset by these lineaments, but such offset is rarely consistent across the ridge belt. Once the mode of formation of these ridge belts is understood, their distribution and orientation will help to constrain the homogeneity and orientation of the stresses over the period of ridge belt formation. The look direction for the Venera system was to the west, so ridges appear as pairs of bright and dark lineaments, with the bright line to the east of the dark. The term ridge was used in a general sense to refer to a linear rise. The use of this term is restricted to rises which have a sharp transition from bright to dark at the crest, and are 5 to 15 km wide. These ridges are either continuous or discontinuous. The continuous ridges are over 30 km long and form coherent ridge belts, while the discontinuous ridges are less than 30 km long and do not form a coherent ridge belt. The continuous ridges were divided into 3 components: (1) Anastomosing ridges, in which the individual ridges are sinuous and often meet and cross at small angles, are the most common component; (2) The parallel ridge component also consists of well defined ridges, often with plains separating the individual ridges, but the ridges are more linear and rarely intersect one another; and (3) Parallel ridged plains are composed of indistinct ridges, some of which do not have a distinctive bright-dark pattern. The nature of deformation within the ridge belts is complex and not fully understood at present. Some belts show distinct signs of compression, while others have symmetrical patterns expected in extensional environments. Thus the ridge belts may have formed by more than one style of deformation; some may be extensional, while others are compressional. All the ridge belts are being systematically mapped, especially for symmetrical relationships

Tessera terrain: Characteristics and models of origin

Tessera terrain consists of complexly deformed regions characterized by sets of ridges and valleys that intersect at angles ranging from orthogonal to oblique, and were first viewed in Venera 15/16 SAR data. Tesserae cover more area (approx. 15 percent of the area north of 30 deg N) than any of the other tectonic units mapped from the Venera data and are strongly concentrated in the region between longitudes 0 deg E and 150 deg E. Tessera terrain is concentrated between a proposed center of crustal extension and divergence in Aphrodite and a region of intense deformation, crustal convergence, and orogenesis in western Ishtar Terra. Thus, the tectonic processes responsible for tesserae are an important part of Venus tectonics. As part of an effort to understand the formation and evolution of this unusual terrain type, the basic characteristics of the tesserae were compared to the predictions made by a number of tectonic models. The basic characteristics of tessera terrain are described and the models and some of their basic predictions are briefly discussed

Flight velocity effects on jet noise of several variations of a 48-tube suppressor installed on a plug nozzle

Because of the relatively high takeoff speeds of supersonic transport aircraft, it is important to know if the flight velocity affects the noise level of suppressor nozzles. To investigate this, a modified F-106B aircraft was used to conduct a series of flyover and static tests on a 48-tube suppressor installed on an uncooled plug nozzle. Comparison of flyover and static spectra indicated that flight velocity had little effect on the noise suppression of the 48-tube suppressor configuration. However, flight velocity adversely affected noise suppression of the 48-tube suppressor with an acoustic shroud and plug installed

Evidence for inbreeding depression in a species with limited opportunity for maternal effects

It is often assumed that mating with close relatives reduces offspring fitness. In such cases, reduced offspring fitness may arise from inbreeding depression (i.e., genetic effects of elevated homozygosity) or from post-mating maternal investment. This can be due to a reduction in female investment after mating with genetically incompatible males ("differential allocation") or compensation for incompatibility ("reproductive compensation"). Here, we looked at the effects of mating with relatives on offspring fitness in mosquitofish, Gambusia holbrooki. In this species, females are assumed to be nonplacental and to allocate resources to eggs before fertilization, limiting differential allocation. We looked at the effects of mating with a brother or with an unrelated male on brood size, offspring size, gestation period, and early offspring growth. Mating with a relative reduced the number of offspring at birth, but there was no difference in the likelihood of breeding, gestation time, nor in the size or growth of these offspring. We suggest that due to limited potential for maternal effects to influence these traits that any reduction in offspring fitness, or lack thereof, can be explained by inbreeding depression rather than by maternal effects. We highlight the importance of considering the potential role of maternal effects when studying inbreeding depression and encourage further studies in other Poeciliid species with different degrees of placentation to test whether maternal effects mask or amplify any genetic effects of mating with relatives.This work was supported bythe Australian Research Council (DP120100339). R.V.-T. is supported by fellowships from Consejo Nacion-al de Ciencia y Tecnologıa-Mexico and the ResearchSchool of Biology

The Alien\u27s Access to Local Remedies: The African Commonwealth Countries\u27 Experience

Of the 27 members of the Commonwealth of Nations, 11 are located on the continent of Africa. They range in size from Nigeria, with an area of 356,000 square miles and a population of 60 million, to The Gambia, with an area of 4,000 square miles and a population of 350,000 persons. Prior to 1957 all of the 11 States were colonies of the British crown. In little more than a decade they have all gained political independence-one hundred and six million people residing in autonomous communities which are, in the words of the 1926 Balfour Declaration, equal in status, and in no way subordinate one to another in any aspect of their domestic or external affairs, though united by a common allegiance to the Crown, and freely associated as members of the British Commonwealth of Nations. \u2

Shortcuts in arithmetic

Thesis (Ed.M.)--Boston Universit

Normal mysticism : an interdisciplinary study of Max Kudushin\u27s rabbinic hermeneutic

Max Kadushin (1895-1980) was a rabbi, professor, and preeminent figure in the history of American Conservative Jewish rabbinic thought. His hermeneutic system, which centers on the idea of organic religious value-concepts, has had a significant influence on the emerging Textual Reasoning movement. In chapter one, I describe the intellectual climate in which Kadushin\u27s system took shape—providing a short history of the 19th-century reform and haskalah movements, discussing the general outline of Alfred North Whitehead\u27s process philosophy tradition, and placing new focus on the tension between Conservative Judaism and Mordecai Kaplan\u27s emerging philosophy of Reconstructionism as a critical factor in the origin of Kadushin\u27s system. In chapter two, I summarize and explain Kadushin\u27s philosophy itself—the anatomy and physiology of the organismic complex, the content of his six volumes of published work, the rabbinic texts that attracted his most focused attention—and place it within the context of what Peter Ochs describes as the aftermodernist movement. In chapter three, I address the relationship between Kadushin and secular Western philosophy. Of particular interest, I argue, is the relevance of his work to philosophical hermeneutics. After outlining how Continental hermeneutics emerged from the largely religious hermeneutics of 19th-century thinkers such as Dilthey and Schleiermacher, I contrast Kadushin\u27s approach with that of Hans-Georg Gadamer and detail the ways in which each of them attempted to describe what Augustine described as the verbum interius—an endeavor that, Gadamer argued, ultimately defines the hermeneutic enterprise. In chapter four, I reassess Kadushin\u27s work from the disciplinary perspective of religious studies. After interpreting the degree to which Kadushin felt his own work relevant to other faith traditions, I examine previous attempts by Christian theologians to adapt the rough outline of his hermeneutic within their system, and contrast his rabbinic hermeneutic with those religious hermeneutic traditions with which his work is most often compared. I also examine the degree to which Kadushin\u27s populist approach to mysticism and value-concepts reflects that of other contemporaneous Western religious thinkers. In chapter five, I examine the moral and social implications of Kadushin\u27s priorities. Taking into account how Kadushin evaluated contemporaneous ethical controversies, I argue that while his endeavor is itself descriptivist, the system he asserts bears a strong resemblance to contemporary virtue ethics. In doing this, I show that Kadushin\u27s system of religious morality cannot be accurately classified as a traditional form of consequentialism, rule-based ethics, prescriptivism, or divine command theory. I also examine the implications of Kadushin\u27s system as they pertain to authority, power, and tradition. In conclusion, I argue that his moral system is, in keeping with its rabbinic roots, highly flexible—a trait that can be both an asset and a liability. This interdisciplinary thesis presents Kadushin\u27s organic hermeneutic in a systematic way, assessing its relevance to the disciplines of philosophy and religious studies. In this thesis, I show that his system of thought rewards serious interdisciplinary study and raises far more general questions than those he specifically intended to address