An experimental investigation of an advanced turboprop installation on a swept wing at subsonic and transonic speeds

An investigation was conducted in the Langley 16-Foot Transonic Tunnel to determine the effects of a turboprop-nacelle installation on the pressure distributions over a swept, supercritical wing. The tests were conducted at Mach numbers from 0.20 to 0.80, at angles of attack from 0 to 5 degrees, nacelle nozzle pressure ratios from 1.0 to 1.6, and at propeller tip speeds from 700 to 800 ft/sec. The results of this study indicate that the turboprop nacelle interference, with and without power, on a swept wing is greater on the inboard wing panel than on the outboard wing panel. The over-the-wing nacelle installation with the propeller upwash on the inboard panel had flow separation problems at a Mach number of 0.80. No severe flow separation problems appear to exist for either propeller rotation direction for the under-the-wing nacelle installation. The local flow disturbances caused by the under-the-wing nacelle installation were in general less severe than for the over-the-wing nacelle installation

Comparison of experimental surface pressures with theoretical predictions on twin two-dimensional convergent-divergent nozzles

A three-dimensional subsonic aerodynamic panel code (VSAERO) was used to predict the effects of upper and lower external nozzle flap geometry on the external afterbody/nozzle pressure coefficient distributions and external nozzle drag of nonaxisymmetric convergent-divergent exhaust nozzles having parallel external sidewalls installed on a generic twin-engine high performance aircraft model. Nozzle static pressure coefficient distributions along the upper and lower surfaces near the model centerline and near the outer edges (corner) of the two surfaces were calculated, and nozzle drag was predicted using these surface pressure distributions. A comparison between the theoretical predictions and experimental wind tunnel data is made to evaluate the utility of the code in calculating the flow about these types of non-axisymmetric afterbody configurations. For free-stream Mach numbers of 0.60 and 0.90, the conditions where the flows were attached on the boattails yielded the best comparison between the theoretical predictions and the experimental data. For the Boattail terminal angles of greater than 15 deg., the experimental data for M = 0.60 and 0.90 indicated areas of separated flow, so the theoretical predictions failed to match the experimental data. Even though calculations of regions of separated flows are within the capabilities of the theoretical method, acceptable solutions were not obtained

Lithological maps of selected Apollo 14 Breccia samples

A booklet of mapped surfaces of some Apollo 14 samples was prepared as an intermediate step towards the preparation of a new Apollo 14 sample catalog. It contains recently obtained observations and pictures of some of the largest and less well documented Apollo breccia samples. Some of the samples (14303, 14305, 14306, and 14311) were chosen because they have large sawn surfaces. These were dusted and mapped using a binocular microscope through the window of the nitrogen cabinet

Reliable solid-state circuits Semiannual report no. 2, Jun. 1 - Nov. 30, 1965

Pulse width modulator and other microminiaturized electronic equipment for space age application

Supersonic aircraft Patent

Design of supersonic aircraft with novel fixed, swept wing planfor

Exploring Alternative Views of Time in Marketing Management: How Temporal Orientation Impacts a Firms’ Strategic Orientations

The field of marketing demonstrates an established and long-standing tradition of incorporating time into its theoretical frameworks. Nonetheless, although marketing has heavily utilized time in its conceptualizations, scholars have suggested that marketing has overly relied upon a single type of time, objective time as measured through a clock, and has underutilized subjective time which refers to time that is differentially perceived and experienced by individuals, organizations, and cultures. In light of this context and need to study alternative forms of time, we explore how a specific type of subjective time – organizational temporal orientation – impacts strategic orientations. This work posits that a specific type of subjective time, organizational temporal orientation, impacts several strategic orientations, including market orientation, production orientation, selling orientation, innovation orientation, and entrepreneurial orientation. Organizational temporal orientation refers to the significance a firm attaches to the past, present, or future (Bluedorn and Denhardt 1988). We follow researchers who have speculated that temporal orientation is an antecedent condition of strategic choice and strategic orientation (Das 1991; West and Meyer 1997). Based on the premise that temporal orientation is an antecedent condition of strategic orientation, this work develops several theoretical propositions, drawing from previous temporal orientation research and strategic orientation research, and discusses the implications of integrating subjective time into theoretical works related to strategic orientations. For instance, we posit that temporal orientation is associated with an innovation orientation (i.e., a willingness to invest in projects with uncertain outcomes), such that: the more future-oriented the firm, the more likely the firm is to pursue an innovation orientation; and the more present-oriented the firm, the less likely the firm is to pursue an innovation orientation. This study makes several key contributions. To our knowledge, this is the first study that specifically connects temporal orientation to a wide-range of strategic orientations (e.g., market orientation, selling orientation), thereby demonstrating the importance of temporal orientation. In addition, this research identifies temporal orientation as a new antecedent of strategic orientations, which complements the extensive work on consequences to strategic orientations (Johnson et al. 2011)

Methanol: Heat Capacity, Enthalpies of Transition and Melting, and Thermodynamic Properties from 5–300°K

Thermal properties of methanol were studied by adiabatic calorimetry. The first‐order nature of the phase transition at 157.4°K with an entropy increment of 0.97 cal mole−1⋅°K−1 was confirmed. The heat capacity of the crystalline phase stable just below the triple point was defined and shown to be extremely sensitive to impurity. No evidence for a second previously‐reported phase transition could be detected. The standard entropy (S°)(S°) and Gibbs energy function (− [G° − H°0] / T)(−[G°−H°0]∕T) for the liquid at 298.15°K are 30.40 and 15.18 cal mole−1⋅°K−1, respectively. The proposed classification of methanol as a plastic crystal on the basis of its small entropy of melting (4.38 cal mole−1⋅°K−1) is considered with respect to hydrogen bonding in the liquid phase.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70007/2/JCPSA6-54-4-1464-1.pd

Use of thermal inertia determined by HCMM to predict nocturnal cold prone areas in Florida

Registered data sets were used to develop qualititative temperature and delta T maps of a band across north Florida and across south Florida for use with Carlson's boundary layer energy model balance model. Thermal inertia and moisture availability computations for north Florida are being used to investigate model sensitivity and to evaluate input parameters. Temperature differences of day-night HCMM overpasses clearly differentiate wetlands and uplands areas