Research on the polarization in porous oxygen electrodes Quarterly report, 1 Jan. - 31 Mar. 1968

Polarization in porous oxygen electrodes and mass transport in gas phase

Conceptual design of a Manned-Unmanned Lunar Explorer /MULE/

Manned-unmanned lunar explorer systems desig

Potential of a New Technique for Remote Sensing of Hydrocarbon Accumulations and Blind Uranium Deposits: Buried Lif Thermoluminescence Dosimeters

Buried thermoluminescence dosimeters may be useful in remote sensing of petroleum and natural gas accumulations and blind uranium deposits. They act as integrating detectors that smooth out the effects of environmental variations that affect other measuring systems and result in irregularities and poor repeatability in measurements made during gas and radiometric surveys

Studies of interface damping Summary technical report, 25 Aug. 1967 - 25 Mar. 1968

Air flow and vacuum effects on damping between solid-solid sliding interfaces in aluminum space structures in relation to surface oxide layer

Critical Aspects to Third Culture Kid terminology and research

Abstract. With globalization and growing numbers of migration, an increasing number of children have transnational lifestyles and are spending parts of their developmental years in multiple cities and countries. Research about the benefits and downsides of a cross-cultural lifestyle has been around since the 1960s and developed under the name of Third Culture Kids (TCK). The research and term, however, are not acknowledged in wider academia. This literature review follows a critical approach with autoethnographic qualities and answers the following research questions: what are the challenges in TCK terminology and what are the challenges in TCK research? The literature review determines that the challenges in TCK terminology are the lack of coherence and unity in the terminology, and the literature and research not defining its main concept of culture nor explaining the theorists the viewpoint is informed by. The challenges in TCK research are determined to be the omission of differentiating factors between the participants in the research and the contradiction between results of TCK studies with the results of studies of similar topics in other fields of research. Based on the literature review, the suggestion is made for TCK research to use theories and models from other fields of research to further develop and clarify the term and literature. The suggestion is made for TCK research to expand on its quantitative research with a focus on the components of reliability, validity, and generalizability while maintaining and growing upon its strong foundation of qualitative research.Tiivistelmä. Globalisaation ja maahanmuuttajien kasvavien määrien myötä yhä useammat lapset elävät monikansalaisittain viettäen heidän kehitysvuosiaan eri kaupungeissa ja eri maissa. Tutkimusta monikulttuurisen elämäntyylin positiivisista ja negatiivisista vaikutuksista on tehty 1960-luvulta lähtien “Kolmannen Kulttuurin Lapset” nimellä. Suomen kontekstissa Kolmannen Kulttuurin Lapsia nimitetään usein matkalaukkulapsiksi. Tutkimusta Kolmannen Kulttuurin Lapsista ei kuitenkaan tunnisteta laajemmin akateemisessa maailmassa. Tämä autoetnografisia piirteitä sisältävä kirjallisuuskatsaus ottaa kriittisen näkökulman ja vastaa seuraaviin tutkimuskysymyksiin: mitkä ovat haasteet Kolmannen Kulttuurin Lapset terminologiassa ja mitkä ovat haasteet Kolmannen Kulttuurin Lapset tutkimuksissa? Kirjallisuuskatsauksessa selviää, että haasteet Kolmannen Kulttuurin Lapset terminologiassa ovat yhtenäisyyden ja johdonmukaisuuden puute, sekä kirjallisuuden tärkeimmän käsitteen- kulttuurin- määrittelemättä jättäminen. Haasteet tutkimuksessa ovat tutkimuksiin osallitujien eriyttävien osatekijöiden huomiotta jättäminen ja ristiriidat Kolmannen Kulttuurin Lapset- tutkimustulosten ja muiden aihealueiden samankaltaisten tutkimustulosten välillä. Kirjallisuuskatsauksen perusteella ehdotan, että Kolmannen Kulttuurin Lapset- tutkimus hyödyntäisi muiden tutkimusalueiden teorioita ja malleja syventääkseen ja selkeyttääkseen tutkimusta. Ehdotan myös, että Kolmannen Kulttuurin Lapset- tutkimus kasvaisi ja rakentuisi vahvan laadulliseen tutkimukseen perustuvan pohjansa päälle. Sen rinnalle olisi tärkeää saada määrällistä tutkimusta, joka keskittyisi validiteetin, reliabiliteetin ja yleistyksen komponentteihin

Constitutive modeling for isotropic materials

The third and fourth years of a 4-year research program, part of the NASA HOST Program, are described. The program goals were: (1) to develop and validate unified constitutive models for isotropic materials, and (2) to demonstrate their usefulness for structural analysis of hot section components of gas turbine engines. The unified models selected for development and evaluation were those of Bodner-Partom and of Walker. The unified approach for elastic-viscoplastic constitutive equations is a viable method for representing and predicting material response characteristics in the range where strain rate and temperature dependent inelastic deformations are experienced. This conclusion is reached by extensive comparison of model calculations against the experimental results of a test program of two high temperature Ni-base alloys, B1900+Hf and Mar-M247, over a wide temperature range for a variety of deformation and thermal histories including uniaxial, multiaxial, and thermomechanical loading paths. The applicability of the Bodner-Partom and the Walker models for structural applications has been demonstrated by implementing these models into the MARC finite element code and by performing a number of analyses including thermomechanical histories on components of hot sections of gas turbine engines and benchmark notch tensile specimens. The results of the 4-year program have been published in four annual reports. The results of the base program are summarized in this report. The tasks covered include: (1) development of material test procedures, (2) thermal history effects, and (3) verification of the constitutive model for an alternative material

A survey of unified constitutive theories

The state of the art of time temperature dependent elastic viscoplastic constitutive theories which are based on the unified approach werre assessed. This class of constitutive theories is characterized by the use of kinetic equations and internal variables with appropriate evolutionary equations for treating all aspects of inelastic deformation including plasticity, creep, and stress relaxation. More than 10 such unified theories which are shown to satisfy the uniqueness and stability criteria imposed by Drucker's postulate and Ponter's inequalities are identified. The theories are compared for the types of flow law, kinetic equation, evolutionary equation of the internal variables, and treatment of temperature dependence. The similarities and differences of these theories are outlined in terms of mathematical formulations and illustrated by comparisons of theoretical calculations with experimental results which include monotonic stress-strain curves, cyclic hysteresis loops, creep and stress relaxation rates, and thermomechanical loops. Numerical methods used for integrating these stiff time temperature dependent constitutive equations are reviewed