A structural model of multiple welfare program participation and labor supply

One of the long-standing issues in the literature on transfer programs for the U.S. low-income population concerns the high cumulative marginal tax rate on earnings induced by participation in the multiplicity of programs offered by the government. Empirical work on the issue has reached an impasse partly because the analytic solution to the choice problem is intractable and partly because the model requires the estimation of multiple sets of equations with limited dependent variables, an estimation problem which until recently has been computationally infeasible. In this paper we estimate a model of labor supply and multiple program participation using methods of simulation estimation that enable us to solve both problems. The results show asymmetric wage and tax rate effects, with fairly large wage elasticities of labor supply but very inelastic responses to moderate changes in cumulative marginal tax rates, implying that high welfare tax rates do not necessarily induce major reductions in work effort.

Jesus as interceding high priest and sacrifice in Hebrews : a response to Nicholas Moore

Is Jesus’ perpetual intercession for his people in Hebrews (Heb. 7.25) understood as a constitutive part of his atoning, high-priestly ministry? Nicholas Moore argues that Jesus’ act of sitting at God’s right hand is the decisive end of Jesus’ atoning sacrifice and so also of Hebrews’ Yom Kippur analogy. Among other points, I argue in response that Jesus’ ongoing absence from his people, status as high priest and current location in the heavenly holy of holies imply that Hebrews’ Yom Kippur analogy extends beyond Jesus’ act of sitting to include his present ministry of intercession. Not only were prayer and atoning sacrifice closely correlated for Second Temple Jews, Hebrews presents Jesus as the high priest who, in his resurrected humanity, is always also the sacrifice in the Father’s presence. Jesus presented himself to the Father once, but he is perpetually the high priest and sacrifice who ministers in God’s presence. For Hebrews, the Yom Kippur analogy (and so also Jesus’ atoning ministry) ends when, like the earthly high priests, Jesus leaves the heavenly holy of holies to return to and again be present with his people (Heb. 9.28). Only then will his followers receive the salvation for which they are waiting. Until that approaching day arrives, Jesus’ ongoing intercession with his Father ensures that his people will be saved completely.Publisher PDFNon peer reviewe

Day of Atonement

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Exodus in Hebrews

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Atonement

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Two-dimensional cold-air cascade study of a film-cooled turbine stator blade. 1: Experimental results of pressure-surface film cooling tests

The effect of film coolant ejection from the pressure side of a stator blade was determined in a two-dimensional cascade. Stator exit surveys were made for each of six rows of coolant holes. Successive multirow tests were made with two, three, four, five, and six rows of coolant holes open. The results of the multirow tests are compared with the predicted multirow performance obtained by adding the single-row data. Results are presented in terms of stator primary-air efficiency as a function of coolant fraction

Cold-air experimental investigation of a turbine with blade trailing edge coolant ejection. 1: Single-stage turbine

Tests were made on a 0.762-meter-tip-diameter research turbine to determine the effect of blade coolant flow on its aerodynamic performance. Both stator and rotor blades had trailing-edge slots for coolant ejection. The turbine was tested over a range of speed and pressure ratio. High primary efficiencies, calculated on the basis of primary air only, were obtained. The efficiency attained was identical to that reported for the turbine from a previous investigation were only slotted stator blades where incorporated in the turbine and tested. And it also compares with results for the turbine with solid blading. Independently varying the rotor coolant flow showed that rotor cooling imposed a severe penalty on turbine efficiency. The thermodynamic efficiency, which accounts for the ideal energies of both blade coolant flows, decreased linearly with rotor coolant at a rate of about 0.7 percent per percent rotor coolant fraction

Design and cold-air test of single-stage uncooled turbine with high work output

A solid version of a 50.8 cm single stage core turbine designed for high temperature was tested in cold air over a range of speed and pressure ratio. Design equivalent specific work was 76.84 J/g at an engine turbine tip speed of 579.1 m/sec. At design speed and pressure ratio, the total efficiency of the turbine was 88.6 percent, which is 0.6 point lower than the design value of 89.2 percent. The corresponding mass flow was 4.0 percent greater than design