1,399 research outputs found

    Religiousness and fertility among muslims in Europe : does Islam influence fertility?

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    There seems to exist a concern over and a belief that fertility among Muslims in Europe is much higher than among non-Muslims, and that this together with Muslim immigration will create a Muslim majority Europe. Furthermore, there is an assumption that Islam is essentially pronatalist and that this causes higher fertility among Muslims. The hypotheses that are investigated in this study are: (1) Muslim fertility rates in Europe are higher than non-Muslim fertility rates, (2) Muslims in Europe are more religious than non-Muslims, (3) Muslims’ higher levels of religiousness correlates with higher fertility rates, and that (4) Islam influences fertility rates. The thesis combines qualitative and quantitative methodological approaches. The aim of this study is to investigate the relationship between Islam and fertility, with an emphasis on the fertility behavior of Muslims in Europe. Core findings of this study are that (1) Fertility of Muslims is higher than that of non-Muslims, (2) Muslim women are much more religious and subscribe more to family values than do non- Muslim women, and (3) More religious women have more children than those less religious. The study finds (4) The odds of having at least two children are significantly greater for women who are religious and who hold strong family values, with the strongest associations among Muslim women. The study also finds that the textual ambiguity of the sacred scriptures, and the lack of a recognized central authority in Islam result in the possibility of simultaneously justifying opposite stands on issues regarding reproductive health. Using the Islamic Republic of Iran as an example, I demonstrate that (5) Islamic scholars can adjust their teachings to either a pronatalist or an antinatalist stance, and thereby can choose to influence fertility behavior of the faithful accordingly; given that they have access to communication institutions that enables them to enforce their teachings. This is a complex debate with need for accurate knowledge and scientific evidence for claims. This study is hopefully such a contribution.Master in International Social Welfare and Health Polic

    Recent flow visualization studies in the 0.3-m TCT

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    Light beams are altered by refractive index changes; flow induced refractive index changes provide the impetus for conventional visualization techniques such as schlieren and shadowgraph. Unfortunately effects related to the flow can be masked by refractive index inhomogeneities external to the test section. A simple shadowgraph scheme was used to assess the flow quality of the Langley 0.3 meter Transonic Cryogenic Tunnel. When the penetration tubes were evacuated the quality of the shadowgraph improved dramatically

    Combined single-pulse holography and time-resolved laser schlieren for flow visualization

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    A pulsed ruby laser and continuous-wave argon ion laser were used in a combined setup at the Langley Expansion Tube for single pulse holography and time resolved laser schlieren with a common optical axis. The systems can be operated simultaneously for a single run. For a single frame, the pulsed holographic setup offers the options of shadowgraph, Schlieren, and interferometry from the reconstructed hologram as well as the advantage of post-run sensitivity adjustments. For flow establishment studies the time resolved laser Schlieren provides visualization of the flow field every 12.5 microns for up to 80 frames with an exposure time per frame of 5.4 microns

    Photogrammetric technique for in-flight ranging of trailing vortices using entrained balloons

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    A method for experimentally determining the radial distance of a probe aircraft from a trailing vortex is described. The method relies on photogrammetric triangulation of targets entrained in the vortex core. The theory and preliminary testing were described using laboratory mock-ups. Solid state video cameras were to provide data at 300 Hz rates. Practical methods for seeding the vortex are under separate investigation and are not addressed

    Video camera system for locating bullet holes in targets at a ballistics tunnel

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    A system consisting of a single charge coupled device (CCD) video camera, computer controlled video digitizer, and software to automate the measurement was developed to measure the location of bullet holes in targets at the International Shooters Development Fund (ISDF)/NASA Ballistics Tunnel. The camera/digitizer system is a crucial component of a highly instrumented indoor 50 meter rifle range which is being constructed to support development of wind resistant, ultra match ammunition. The system was designed to take data rapidly (10 sec between shoots) and automatically with little operator intervention. The system description, measurement concept, and procedure are presented along with laboratory tests of repeatability and bias error. The long term (1 hour) repeatability of the system was found to be 4 microns (one standard deviation) at the target and the bias error was found to be less than 50 microns. An analysis of potential errors and a technique for calibration of the system are presented

    Dynamic Moire Methods for Detection of Loosened Space Shuttle Tiles

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    Moire fringe methods for detecting loose space shuttle tiles were investigated with a test panel consisting of a loose tile surrounded by four securely bonded tiles. The test panel was excited from 20 to 150 Hz with in-plane sinusoidal acceleration of 2 g (peak). If the shuttle orbiter can be subjected to periodic excitation of 1 to 2 g (peak) and rigid-body periodic displacements do not mask the change in the Moire pattern due to tile looseness, then the use of projected Moire fringes to detect out-of-plane rockin appears to be the most viable indicator of tile looseness since no modifications to the tiles are required

    Method for Correcting Control Surface Angle Measurements in Single Viewpoint Photogrammetry

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    A method of determining a corrected control surface angle for use in single viewpoint photogrammetry to correct control surface angle measurements affected by wing bending. First and second visual targets are spaced apart &om one another on a control surface of an aircraft wing. The targets are positioned at a semispan distance along the aircraft wing. A reference target separation distance is determined using single viewpoint photogrammetry for a "wind off condition. An apparent target separation distance is then computed for "wind on." The difference between the reference and apparent target separation distances is minimized by recomputing the single viewpoint photogrammetric solution for incrementally changed values of target semispan distances. A final single viewpoint photogrammetric solution is then generated that uses the corrected semispan distance that produced the minimized difference between the reference and apparent target separation distances. The final single viewpoint photogrammetric solution set is used to determine the corrected control surface angle

    Aeroelastic Deformation: Adaptation of Wind Tunnel Measurement Concepts to Full-Scale Vehicle Flight Testing

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    The adaptation of a proven wind tunnel test technique, known as Videogrammetry, to flight testing of full-scale vehicles is presented. A description is presented of the technique used at NASA's Dryden Flight Research Center for the measurement of the change in wing twist and deflection of an F/A-18 research aircraft as a function of both time and aerodynamic load. Requirements for in-flight measurements are compared and contrasted with those for wind tunnel testing. The methodology for the flight-testing technique and differences compared to wind tunnel testing are given. Measurement and operational comparisons to an older in-flight system known as the Flight Deflection Measurement System (FDMS) are presented

    Blade Displacement Measurements of the Full-Scale UH-60A Airloads Rotor

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    Blade displacement measurements were acquired during a wind tunnel test of the full-scale UH-60A Airloads rotor. The test was conducted in the 40- by 80-Foot Wind Tunnel of the National Full-Scale Aerodynamics Complex at NASA Ames Research Center. Multi-camera photogrammetry was used to measure the blade displacements of the four-bladed rotor. These measurements encompass a range of test conditions that include advance ratios from 0.15 to unique slowed-rotor simulations as high as 1.0, thrust coefficient to rotor solidity ratios from 0.01 to 0.13, and rotor shaft angles from -10.0 to 8.0 degrees. The objective of these measurements is to provide a benchmark blade displacement database to be utilized in the development and validation of rotorcraft computational tools. The methodology, system development, measurement techniques, and preliminary sample blade displacement measurements are presented
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