A note on photographing otoliths

No Abstrac

Contributions to the biology of the Cape gurnard, Trigla capensis (Pisces : Triglidae): age, growth and reproduction

Study of otoliths of the Cape gurnard,Trigla capensis, has established that the rings are annular. An opaque zone is formed from February to Jury and a hyaline zone during the spawning season from August to March. Females grow faster than males. The Von Bertalanffy growth equation of the females was found to be Lt = 71,4(1-e0 ,100(t + 0,41)) and for the males Lt = 58,6(1-e-0, 100(t + 0,28)). Male fishes are sexually mature at a total length of37cm at the end of the fifth year. The female fishes are all sexually mature at a total length of 35 cm at the age of four years

HITES 2012: 'Horizons of Innovative Theories, Experiments, and Supercomputing in Nuclear Physics'

This volume contains the contributions of the speakers of an international conference in honor of Jerry Draayer's 70th birthday, entitled 'Horizons of Innovative Theories, Experiments and Supercomputing in Nuclear Physics'. The list of contributors includes not only international experts in these fields, but also many former collaborators, former graduate students, and former postdoctoral fellows of Jerry Draayer, stressing innovative theories such as special symmetries and supercomputing, both of particular interest to Jerry. The organizers of the conference intended to honor Jerry Draayer not only for his seminal contributions in these fields, but also for his administrative skills at departmental, university, national and international level. Signed: Ted Hecht University of Michigan ##IMG## [http://ej.iop.org/images/1742-6596/403/1/011001/confphoto.jpg] {Conference photograph ----- -- Scientific Advisory Committee ----- -- Ani Aprahamian -- University of Notre Dame ----- -- Baha Balantekin -- University of Wisconsin ----- -- Bruce Barrett -- University of Arizona ----- -- Umit Catalyurek -- Ohio State Unversity ----- -- David Dean -- Oak Ridge National Laboratory ----- -- Jutta Escher (Chair) -- Lawrence Livermore National Laboratory ----- -- Jorge Hirsch -- UNAM, Mexico ----- -- David Rowe -- University of Toronto ----- -- Brad Sherill & Michigan State University ----- -- Joel Tohline -- Louisiana State University ----- -- Edward Zganjar -- Lousiana State University ----- -- Organizing Committee ----- -- Jeff Blackmon -- Louisiana State University ----- -- Mark Caprio -- University of Notre Dame ----- -- Tomas Dytrych -- Louisiana State University ----- -- Ana Georgieva -- INRNE, Bulgaria ----- -- Kristina Launey (Co-chair) -- Louisiana State University ----- -- Gabriella Popa -- Ohio University Zanesville ----- -- James Vary (Co-chair) -- Iowa State University ----- -- Local Organizing Committee ----- -- Laura Linhardt -- Louisiana State University ----- -- Charlie Rasco -- Louisiana State University ----- -- Karen Richard (Coordinator) -- Louisiana State University -----Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/98638/1/1742-6596_403_1_011001.pd

Representation Theory Approach to the Polynomial Solutions of q - Difference Equations : U_q(sl(3)) and Beyond,

A new approach to the theory of polynomial solutions of q - difference equations is proposed. The approach is based on the representation theory of simple Lie algebras and their q - deformations and is presented here for U_q(sl(n)). First a q - difference realization of U_q(sl(n)) in terms of n(n-1)/2 commuting variables and depending on n-1 complex representation parameters r_i, is constructed. From this realization lowest weight modules (LWM) are obtained which are studied in detail for the case n=3 (the well known n=2 case is also recovered). All reducible LWM are found and the polynomial bases of their invariant irreducible subrepresentations are explicitly given. This also gives a classification of the quasi-exactly solvable operators in the present setting. The invariant subspaces are obtained as solutions of certain invariant q - difference equations, i.e., these are kernels of invariant q - difference operators, which are also explicitly given. Such operators were not used until now in the theory of polynomial solutions. Finally the states in all subrepresentations are depicted graphically via the so called Newton diagrams.Comment: uuencoded Z-compressed .tar file containing two ps files

Generalizations of the vector coherent state method

The introduction of a set of intrinsic coordinates to give an explicit construction of the intrinsic states of vector coherent state theory has greatly simplified earlier attempts to generalize this theory to include the construction of vector coherent state realizations of operators other than the group generators. The group U(3)⊇ U(2)×U(1) is used as a prototype. The construction of irreducible tensor operators with specific shift properties is illustrated with a number of examples. These show how the Wigner calculus for a higher symmetry group can be expressed solely in terms of the recoupling coefficients of the core subgroup and the simple K‐matrix elements of vector coherent state theory.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87293/2/27_1.pd

Summation relation for U(N) Racah coefficients

A summation relation is given for U(N) Racah coefficients which has the form of an orthogonality relation, or a composition of recoupling transformations, except that the summation over column indices (for fixed row indices) is over multiplicity labels only. In the recoupling matrix for [f1] × [f2] × [f3] → [f], U(N) irreducible representations [f2] and [f3] are limited to be elementary, [11…10…0]≡[1k], or totally symmetric [k], or of the form [kN−1]. Results are tabulated as functions of the axial distances in [f] for [f2]=[1N−1], [1N−2], or [2N−1]; [f3]=[1], [12], or [2]; all cases which arise in the evaluation of squares of matrix elements of one‐ and two‐body operators averaged over irreducible representations of U(N).Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70621/2/JMAPAQ-15-12-2148-1.pd

Development of sputtered techniques for thrust chambers

Techniques and materials were developed and evaluated for the fabrication and coating of advanced, long life, regeneratively cooled thrust chambers. Materials were analyzed as fillers for sputter application of OFHC copper as a closeout layer to channeled inner structures; of the materials evaluated, aluminum was found to provide the highest bond strength and to be the most desirable for chamber fabrication. The structures and properties were investigated of thick sputtered OFHC copper, 0.15 Zr-Cu, Al2O3,-Cu, and SiC-Cu. Layered structures of OFHC copper and 0.15 Zr-Cu were investigated as means of improving chamber inner wall fatigue life. The evaluation of sputtered Ti-5Al-2.5Sn, NASA IIb-11, aluminum and Al2O3-Al alloys as high strength chamber outer jackets was performed. Techniques for refurbishing degraded thrust chambers with OFHC copper and coating thrust chambers with protective ZrO2 and graded ZrO2-copper thermal barrier coatings were developed

Development of sputtered techniques for thrust chambers, task 1

Filler materials proposed for use in the sputter fabrication regeneratively cooled thrust chambers were evaluated. Low melting castable alloys, CERROBEND. CERROCAST, and CERROTRU, slurry applied SERMETEL 481 and flame-sprayed aluminum were investigated as filler materials. Sputter deposition from a cylindrical cathode inverted magnestron was used to apply an OFHC copper closeout layer to filled OFHC copper ribbed-wall cylindrical substrates. The sputtered closeout layer structure was evaluated with respect to filler material contamination, predeposition machining and finishing operations, and deposition parameters. The application of aluminum by flame-spraying resulted in excessiver filler porosity. Though the outgassing from this porosity was found to be detrimental to the closeout layer structure, bond strengths in excess of 10,500 psi were achieved. Removal of the aluminum from the grooves was readily accomplished by leaching in a 7.0 molar solution of sodium hydroxide at 353 K. Of the other filler materials evaluated, CERROTRU was found to be the most suitable material with respect to completely filling the ribbed-wall cylinders and vacuum system compatibility. However, bond contamination resulted in low closeout layer bond strength with the CERROTRU filler. CERROBEND, CERROCAST, and SERMETEL 481 were found to be unacceptable as filler materials

The feeding and reproductive biology of a South African Anabandid fish Sandelia bainsii

#Sandelia bainsii est un prédateur euryphage opportuniste. Il atteint sa maturité sexuelle à deux ans et se reproduit plusieurs fois entre octobre et février. La saison de reproduction est étroitement liée aux augmentations de température et des précipitations et s'accompagne d'une augmentation de l'alimentation. Certains grands traits de la biologie de cette espèce sont comparables à celles d'autres #Anabandidae. (Résumé d'auteur