20,498 research outputs found
One flesh: in the Old and New Testaments
Genesis 1-11. Although much has been written on sexuality and marriage from the perspective of the Old and New Testaments, little attention has been given to what is perhaps the most engaging and elusive expression relating to the whole topic, namely, the \u27one flesh\u27 expression which occurs in the poetic climax of the Genesis 2 account of creation and recurs as a technical expression in the New Testament writing. The purpose of this paper is to explore the use of this expression in the Old and New Testaments in the interests of understanding more fully its content. [Excerpt]
High speed precision motion strategies for lightweight structures
Work during the recording period proceeded along the lines of the proposal, i.e., three aspects of high speed motion planning and control of flexible structures were explored: fine motion control, gross motion planning and control, and automation using light weight arms. In addition, modeling the large manipulator arm to be used in experiments and theory has lead to some contributions in that area. These aspects are reported below. Conference, workshop and journal submissions, and presentations related to this work were seven in number, and are listed. Copies of written papers and abstracts are included
A Stereotaxic Atlas of the Brain of the Chick (Gallus domesticus)
Nine brains taken from chicks two weeks of age were used for the development of this atlas. Each chick was first anesthetized with an intravenous (IV) injection of Chloropent2 (1.8 ml/kg). Chicks were then perfused via the heart with 90 ml physiological saline followed by 90 ml Heidenhain\u27s3 solution. Each head was then positioned in a stereotaxic instrument as described in the previous section and three stainless steel (SS) insect pins (#2) were implanted in each brain at known coordinates. In the case of the brains used to construct the cross- sectional atlas plates, two pins were implanted horizontal to the base of the stereotaxic instrument. Each was inserted into the forebrain and the pins exited either the brainstem or the cerebellum. The third pin was inserted vertical to the base of the stereotaxic instrument. The brains used to construct the sagittal atlas plates had two pins inserted horizontally and one pin inserted vertically to the stereotaxic instrument. The horizontal pins entered the right side of the brain and exited the left side. The brains used for the horizontal plates had two pins inserted vertically and one pin horizontally. The latter entered the forebrain and exited the brainstem
High speed, precision motion strategies for lightweight structures
Research on space telerobotics is summarized. Adaptive control experiments on the Robotic Arm, Large and Flexible (RALF) were preformed and are documented, along with a joint controller design for the Small Articulated Manipulator (SAM), which is mounted on the RALF. A control algorithm is described as a robust decentralized adaptive control based on a bounded uncertainty approach. Dynamic interactions between SAM and RALF are examined. Unstability of the manipulator is studied from the perspective that the inertial forces generated could actually be used to more rapidly damp out the flexible manipulator's vibration. Currently being studied is the modeling of the constrained dynamics of flexible arms
Evidence for horizon-scale power from CMB polarization
The CMB temperature power spectrum offers ambiguous evidence for the
existence of horizon-scale power in the primordial power spectrum due to
uncertainties in spatial curvature and the physics of cosmic acceleration as
well as the observed low quadrupole. Current polarization data from WMAP
provide evidence for horizon-scale power that is robust to these uncertainties.
Polarization on the largest scales arises mainly from scattering at z<6 when
the universe is fully ionized, making the evidence robust to ionization history
variations at higher redshifts as well. A cutoff in the power spectrum is
limited to C=k_C/10^{-4} Mpc^{-1}<5.2 (95% CL) by polarization, only slightly
weaker than joint temperature and polarization constraints in flat LCDM
(C<4.2). Planck should improve the polarization limit to C<3.6 for any model of
the acceleration epoch and ionization history as well as provide tests for
foreground and systematic contamination.Comment: 4 pages, 2 figures; submitted to Phys. Rev. D (Rapid Communications).
Code for modified reionization in CAMB and CosmoMC available at
http://background.uchicago.edu/camb_rpc
Non-Linear Stability Analysis of Higher Order Dissipative Partial Differential Equations
We extend the invariant manifold method for analyzing the asymptotics of
dissipative partial differential equations on unbounded spatial domains to
treat equations in which the linear part has order greater than two. One
important example of this type of equation which we analyze in some detail is
the Cahn-Hilliard equation. We analyze the marginally stable solutions of this
equation in some detail. A second context in which such equations arise is in
the Ginzburg-Landau equation, or other pattern forming equations, near a
codimension-two bifurcation
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