Advanced solar cell power systems for space

Advanced solar cell power systems to reduce weight and withstand thermal stress conditions of Interplanetary Monitoring Platform /IMP-D

Letter from R. G. Slifer to John Muir, 1899 Sep 10.

Kodiak, Alaska, September 10, 1899. Prof. John Muir,Martinez, Cal,My Dear Sir:- The mail boat yesterday brought me the two volumes that you sent me. Will you accept my hearty thanks for your great kindness? You may be sure that it has been appreciated very much indeed. I have had time to merely glance over The Mountains of California but I know that I shall enjoy it, I will prize it especially because it is the gift of the author as I think I told you that I would never have come to Alaska had it not been for your writings. It will always bring to mind the few days spent at Kodiak by the Harriman Expedition .I have written to a party in Cook\u27s Inlet concerning some baskets of spruce bark and by this same mail I received word that some would be shipped me in the next schooner coming this way. I shall try to see that you get a specimen of the work this winter. I will also see that you get the leaves and blossoms in the spring as requested. We have had a magnificent summer here - the finest weather I ever experienced anywhere and it is still nice. I am hoping that this winter will be as enjoyable as was the one I have spent here. If such will be the case I will leave here convinced that it is impossible to02620 Prof. John Muir. Page 2. find a healthier spot anywhere. I was very sorry that you came back through Kodiak v/hen I was away for I should have been glad to see you all again and hear of your experiences to the Westward. I hope that they proved as enjoyable as the former parts of your trip. I was down in one of the numerous bays near here with a crowd of haymakers. I have spent almost all the vacation out in the open and have enjoyed it wonderfully.I shall be very glad to be remembered to any of your party whom you think might care to remember an Alaskan school teacher. I expect to write to Mr. Keeler soon. Again thanking you for your great kindness, I amVery sincerely yours, R. G. Slifer. 0262

Small spacecraft power and thermal subsystems

This white paper provides a general guide to the conceptual design of satellite power and thermal control subsystems with special emphasis on the unique design aspects associated with small satellites. The operating principles of these technologies are explained and performance characteristics of current and projected components are provided. A tutorial is presented on the design process for both power and thermal subsystems, with emphasis on unique issues relevant to small satellites. The ability of existing technology to meet future performance requirements is discussed. Conclusions and observations are presented that stress cost-effective, high-performance design solutions

Electron microscopic studies on the palpi of Cybister fimbriolatus fimbriolatus (Say)

The maxillary palpi of the predaceous diving beetle Cybister fimbriolatus fimbriolatus Say were observed by transmission and scanning electron microscopy. Scanning electron microscopy shows at least two types of sensilla at the tip of palp, which are referred to as “circumvallate and naked sensilla”. The former are innervated with outer segments of distal processes of sensory cells, but the latter are provided only with chitin and cuticular substances.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/47659/1/441_2004_Article_BF00330709.pd

Spin Sum Rules and the Strong Coupling Constant at large distance

We present recent results on the Bjorken and the generalized forward spin polarizability sum rules from Jefferson Lab Hall A and CLAS experiments, focusing on the low $Q^2$ part of the measurements. We then discuss the comparison of these results with Chiral Perturbation theory calculations. In the second part of this paper, we show how the Bjorken sum rule with its connection to the Gerasimov-Drell-Hearn sum, allows us to conveniently define an effective coupling for the strong force at all distances.Comment: Contribution to proceedings for the Workshop on Spin Structure at Long Distance (Newport News, March 2009

Experimental determination of the evolution of the Bjorken integral at low Q^2

We extract the Bjorken integral Gamma^{p-n}_1 in the range 0.17 < Q^2 < 1.10 GeV^2 from inclusive scattering of polarized electrons by polarized protons, deuterons and 3He, for the region in which the integral is dominated by nucleon resonances. These data bridge the domains of the hadronic and partonic descriptions of the nucleon. In combination with earlier measurements at higher Q^2, we extract the non-singlet twist-4 matrix element f_2.Comment: Quoted world data updated. Minor change in some results, Minor rephrasin

Quark-Hadron Duality in Neutron (3He) Spin Structure

We present experimental results of the first high-precision test of quark-hadron duality in the spin-structure function g_1 of the neutron and $^3$He using a polarized 3He target in the four-momentum-transfer-squared range from 0.7 to 4.0 (GeV/c)^2. Global duality is observed for the spin-structure function g_1 down to at least Q^2 = 1.8 (GeV/c)^2 in both targets. We have also formed the photon-nucleon asymmetry A_1 in the resonance region for 3He and found no strong Q^2-dependence above 2.2 (GeV/c)^2.Comment: 13 pages, 3 figure

Moments of the neutron g2g_2 structure function at intermediate Q2Q^2

We present new experimental results of the $^3$He spin structure function $g_2$ in the resonance region at $Q^2$ values between 1.2 and 3.0 (GeV/c)$^2$. Spin dependent moments of the neutron were then extracted. Our main result, the resonance contribution to the neutron $d_2$ matrix element, was found to be small at $$=2.4 (GeV/c)$^2$ and in agreement with the Lattice QCD calculation. The Burkhardt-Cottingham sum rule for $^3$He and the neutron was tested with the measured data and using the Wandzura-Wilczek relation for the low $x$ unmeasured region. A small deviation was observed at $Q^2$ values between 0.5 and 1.2 (GeV/c)$^2$ for the neutron

Probing Quark-Gluon Interactions with Transverse Polarized Scattering

We have extracted QCD matrix elements from our data on double polarized inelastic scattering of electrons on nuclei. We find the higher twist matrix element \tilde{d_2}, which arises strictly from quark- gluon interactions, to be unambiguously non zero. The data also reveal an isospin dependence of higher twist effects if we assume that the Burkhardt-Cottingham Sum rule is valid. The fundamental Bjorken sum rule obtained from the a0 matrix element is satisfied at our low momentum transfer.Comment: formerly "Nachtmann Moments of the Proton and Deuteron Spin Structure Functions