Nimbus power systems /1960 - 1969/

Power supply subsystems for use on Nimbus satellite progra

Better Late than Never: Publication of the Decisions from the 1845 Term of the Republic of Texas Supreme Court

Two years ago, this column featured the rediscovery of a full year\u27s worth of decisions issued by the Supreme Court of the Republic of Texas that had never been printed. Paulsen & Hambleton, Whatever Happened to 7845? The Missing Decisions of the Texas Supreme Court, 48 Tex. B.J. 830 (1985). Those decisions now have been collected and will appear in the December 1986 issue of the Texas Law Review (The Missing Cases of the Republic, 65 Texas L. Rev. 377 (1986)). Although none of the missing cases are likely to have any direct bearing on the outcome of the Texaco-Pennzoil appeal or any other great legal issue of our day, the opinions nevertheless should be of considerable interest to attorneys, law librarians, and historians

Better Late than Never: Publication of the Decisions from the 1845 Term of the Republic of Texas Supreme Court

Two years ago, this column featured the rediscovery of a full year\u27s worth of decisions issued by the Supreme Court of the Republic of Texas that had never been printed. Paulsen & Hambleton, Whatever Happened to 7845? The Missing Decisions of the Texas Supreme Court, 48 Tex. B.J. 830 (1985). Those decisions now have been collected and will appear in the December 1986 issue of the Texas Law Review (The Missing Cases of the Republic, 65 Texas L. Rev. 377 (1986)). Although none of the missing cases are likely to have any direct bearing on the outcome of the Texaco-Pennzoil appeal or any other great legal issue of our day, the opinions nevertheless should be of considerable interest to attorneys, law librarians, and historians

Electrifying urban ridesourcing fleets at no added cost through efficient use of charging infrastructure

Ridesourcing fleets present an opportunity for rapid uptake of battery electric vehicles (BEVs) but adoption has largely been limited to small pilot projects. Lack of charging infrastructure presents a major barrier to scaling up, but little public information exists on the infrastructure needed to support ridesourcing electrification. With data on ridesourcing trips for New York City and San Francisco, and using agent-based simulations of BEV fleets, we show that given a sparse network of three to four 50 kW chargers per square mile, BEVs can provide the same level of service as internal combustion engine vehicles (ICEVs) at lower cost. This suggests that the cost of charging infrastructure is not a significant barrier to ridesourcing electrification. With coordinated use of charging infrastructure across vehicles, we also find that fleet performance becomes robust to variation in battery range and placement of chargers. Our analysis suggests that mandates on ridesourcing such as the California Clean Miles Standard could achieve electrification without significantly increasing the cost of ridesourcing services

Spiral ground state against ferroelectricity in the frustrated magnet BiMnFe2O6

The spiral magnetic structure and underlying spin lattice of BiMnFe2O6 are investigated by low-temperature neutron powder diffraction and density functional theory band structure calculations. In spite of the random distribution of the Mn3+ and Fe3+ cations, this compound undergoes a transition into an incommensurate antiferromagnetically ordered state below TN ~ 220 K. The magnetic structure is characterized by the propagation vector k=[0,beta,0] with beta ~ 0.14 and the P22_12_11'(0 \beta 0)0s0s magnetic superspace symmetry. It comprises antiferromagnetic helixes propagating along the b-axis. The magnetic moments lie in the ac plane and rotate about pi*(1+beta) ~ 204.8 deg angle between the adjacent magnetic atoms along b. The spiral magnetic structure arises from the peculiar frustrated arrangement of exchange couplings in the ab plane. The antiferromagnetic coupling along the c-axis leads to the cancellation of electric polarization, and results in the lack of ferroelectricity in BiMnFe2O6.Comment: 11 pages, 8 figures, 8 table

Magnetic and electric properties of double-perovskites and estimation of their Curie temperatures by ab initio calculations

First principles electronic structure calculations have been carried out on ordered double perovskites Sr_2B'B"O_6 (for B' = Cr or Fe and B" 4d and 5d transition metal elements) with increasing number of valence electrons at the B-sites, and on Ba_2MnReO_6 as well as Ba_2FeMoO_6. The Curie temperatures are estimated ab initio from the electronic structures obtained with the local spin-density functional approximation, full-potential generalized gradient approximation and/or the LDA+U method (U - Hubbard parameter). Frozen spin-spirals are used to model the excited states needed to evaluate the spherical approximation for the Curie temperatures. In cases, where the induced moments on the oxygen was found to be large, the determination of the Curie temperature is improved by additional exchange functions between the oxygen atoms and between oxygen and B' and B" atoms. A pronounced systematics can be found among the experimental and/or calculated Curie temperatures and the total valence electrons of the transition metal elements.Comment: 8 pages, 11 figures. Submitted to the Physical Review

Recent Developments in the Law of the Sea IV: A Synopsis

This Article presents an annual synopsis of important events pertaining to the law of the sea which occurred between February 1, 1972, and January 31, 1973. Our major sources of information included the New York Times, the Environmental Reporter, the United States Code Congressional and Administrative News, the Congressional Record, the United Nations Chronicle, and International Legal Materials. It is our hope that the search through a seemingly endless array of indices, newspapers, microfilms, and dusty shelves will prove to be of value. We regret that the synopsis must once again report more problems than solutions, but it is with great optimism that we look to the forthcoming United Nations Conference on the Law of the Sea. Perhaps the next synopsis will report some far-reaching accomplishments of that Conference. Finally, we express our sincerest appreciation to Professor H. Gary Knight. His faith in the value of the synopsis has been a great encouragement

Influence of Finite Span and Sweep on Active Flow Control Efficacy

Active flow control efficacy was investigated by means of leading-edge and flap-shoulder zero mass-flux blowing slots on a semispan wing model that was tested in unswept (standard) and swept configurations. On the standard configuration, stall commenced inboard, but with sweep the wing stalled initially near the tip. On both configurations, leading-edge perturbations increased CL,max and post stall lift, both with and without deflected flaps. Without sweep, the effect of control was approximately uniform across the wing span but remained effective to high angles of attack near the tip; when sweep was introduced a significant effect was noted inboard, but this effect degraded along the span and produced virtually no meaningful lift enhancement near the tip, irrespective of the tip configuration. In the former case, control strengthened the wingtip vortex; in the latter case, a simple semi-empirical model, based on the trajectory or "streamline" of the evolving perturbation, served to explain the observations. In the absence of sweep, control on finite-span flaps did not differ significantly from their nominally twodimensional counterpart. Control from the flap produced expected lift enhancement and CL,max improvements in the absence of sweep, but these improvements degraded with the introduction of sweep