Search Results - (Author, Cooperation:J. D. Evans)
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1Latest Papers from Table of Contents or Articles in PressK. M. Kapheim ; H. Pan ; C. Li ; S. L. Salzberg ; D. Puiu ; T. Magoc ; H. M. Robertson ; M. E. Hudson ; A. Venkat ; B. J. Fischman ; A. Hernandez ; M. Yandell ; D. Ence ; C. Holt ; G. D. Yocum ; W. P. Kemp ; J. Bosch ; R. M. Waterhouse ; E. M. Zdobnov ; E. Stolle ; F. B. Kraus ; S. Helbing ; R. F. Moritz ; K. M. Glastad ; B. G. Hunt ; M. A. Goodisman ; F. Hauser ; C. J. Grimmelikhuijzen ; D. G. Pinheiro ; F. M. Nunes ; M. P. Soares ; E. D. Tanaka ; Z. L. Simoes ; K. Hartfelder ; J. D. Evans ; S. M. Barribeau ; R. M. Johnson ; J. H. Massey ; B. R. Southey ; M. Hasselmann ; D. Hamacher ; M. Biewer ; C. F. Kent ; A. Zayed ; C. Blatti, 3rd ; S. Sinha ; J. S. Johnston ; S. J. Hanrahan ; S. D. Kocher ; J. Wang ; G. E. Robinson ; G. Zhang
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-05-16Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Amino-Acid N-Acetyltransferase ; Animals ; Bees/classification/*genetics ; DNA Transposable Elements ; *Evolution, Molecular ; Gene Expression Regulation ; Gene Regulatory Networks ; *Genetic Drift ; Genome, Insect/genetics ; Phylogeny ; Selection, Genetic ; *Social Behavior ; Transcription Factors/chemistry/genetics ; *TranscriptomePublished by: -
2Latest Papers from Table of Contents or Articles in PressG. E. Robinson ; K. J. Hackett ; M. Purcell-Miramontes ; S. J. Brown ; J. D. Evans ; M. R. Goldsmith ; D. Lawson ; J. Okamuro ; H. M. Robertson ; D. J. Schneider
American Association for the Advancement of Science (AAAS)
Published 2011Staff ViewPublication Date: 2011-03-19Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Arthropods/genetics ; Genome ; *Genome, Insect ; Insects/*genetics ; *Sequence Analysis, DNAPublished by: -
3Articles: DFG German National LicensesMakino, T. ; Evans, J. D. ; Mak, G.
Woodbury, NY : American Institute of Physics (AIP)
Published 1997Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: An efficient phenomenological model describing the temperature dependence of the output power of multiquantum well (MQW) lasers is presented. The model can predict all the general features of the experimental results. The effect of series resistance, thermal resistance, cavity length, leakage current, and facet reflectivity on the maximum achievable power are analyzed in a systematic manner. The calculated maximum operating temperature (Tm), defined as the heat sink temperature at which the saturated output power vanishes due to heating, is in reasonable agreement with reported experimental results. © 1997 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesTakasaki, B. W. ; Preston, J. S. ; Evans, J. D. ; Simmons, J. G. ; Puetz, N.
Woodbury, NY : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: We report on the first time-resolved photoconductivity measurements in strained InGaAsP multiple quantum well 1.3 μm laser structures. The photoconductive response is characterized by two exponential time constants, a fast time constant of less than 500 ps and a long time constant between 10 and 20 ns. We attribute these to the escape of electrons and holes from the wells, respectively.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesElenkrig, B. B. ; Thompson, D. A. ; Simmons, J. G. ; Bruce, D. M. ; Si, Yu. ; Zhao, Jie ; Evans, J. D. ; Templeton, I. M.
Woodbury, NY : American Institute of Physics (AIP)
Published 1994Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: The effect of strain on F+ and Si+ implantation-induced compositional disordering in InGaAsP strained layer multiple-quantum-well (MQW) heterostructures has been studied by investigating the temperature dependence of the photoluminescence (PL) spectra and spatial distribution of degree of polarization of PL for both compressive and tensile strained, and unstrained MQW heterostructures. It was found that under similar implantation and anneal conditions a spectral blueshift occurs which is largest in the compressively strained structure and the smallest in the tensile one. This behavior is explained in terms of implantation-enhanced interdiffusion, by taking into account the composition differences of elements between the wells and barriers. The development of strain related to the process of interdiffusion has been experimentally observed.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesMakino, T. ; Lu, H. ; Evans, J. D.
Woodbury, NY : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: A phenomenological model describing the temperature dependence of the threshold current of 1.3 μm gain-coupled distributed feedback (DFB) lasers with periodically etched strained-layer quantum wells is presented and compared to experimental results. The model can predict the minimum threshold current as a function of temperature (infinite T0), which has been observed experimentally. The mechanism for the appearance of this minimum is explained by the decrease of the detuning of the DFB-mode wavelength from the material gain-peak wavelength as the temperature increases. The condition for single-mode operation is also discussed with use of the effective gain of DFB laser structures. © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesDarrow, D. S. ; Ono, M. ; Forest, C. B. ; Greene, G. J. ; Hwang, Y. S. ; Park, H. K. ; Taylor, R. J. ; Pribyl, P. A. ; Evans, J. D. ; Lai, K. F. ; Liberati, J. R.
New York, NY : American Institute of Physics (AIP)
Published 1990Staff ViewISSN: 1089-7666Source: AIP Digital ArchiveTopics: PhysicsNotes: Several dc helicity injection experiments using an electron beam technique have been conducted on the Current Drive Experiment (CDX) [Phys. Rev. Lett. 59, 2165 (1987)] and the Continuous Current Tokamak (CCT) [Phys. Rev. Lett. 63, 2365 (1989)]. The data strongly suggest that tokamak plasmas are being formed and maintained by this method. The largest currents driven to date are 1 kA in CDX (qa =5) and 6 kA in CCT (qa =3.5). An initial comparison of discharge properties with helicity theory indicates rough agreement. Current drive energy efficiencies are 9% and 23% of Ohmic efficiency in two cases analyzed. Strong radial electric fields are observed in these plasmas that cause poloidal rotation and, possibly, improved confinement.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesEvans, J. D. ; Kuske, R. ; Keller, Joseph B.
Oxford, UK : Blackwell Publishers, Inc.,
Published 2002Staff ViewISSN: 1467-9965Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MathematicsEconomicsNotes: Explicit expressions valid near expiry are derived for the values and the optimal exercise boundaries of American put and call options on assets with dividends. The results depend sensitively on the ratio of the dividend yield rate D to the interest rate r. For D〉r the put boundary near expiry tends parabolically to the value rK/D where K is the strike price, while for D≤r the boundary tends to K in the parabolic-logarithmic form found for the case D=0 by Barles et al. (1995) and by Kuske and Keller (1998). For the call, these two behaviors are interchanged: parabolic and tending to rK/D for D〈r, as was shown by Wilmott, Dewynne, and Howison (1993), and parabolic-logarithmic and tending to K for D≥r. The results are derived twice: once by solving an integral equation, and again by constructing matched asymptotic expansions.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1420-9098Keywords: Myrmica tahoensis ; sex ratio ; relatedness ; microsatellite DNA ; sex allocationSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Summary Sex allocation was measured across six seasons in colonies of the facultatively polygynous antMyrmica tahoensis. The overall proportion of colonies that produced sexuals was constant throughout the study, but population-level sex ratios varied considerably. In 1991, 1993, and 1995, a significantly greater proportion of colonies produced females than in 1990, 1992, and 1994. Sex ratios were similar across six sites within individual years, suggesting a population-wide cause of sex-ratio variation. Individual colonies tended, on average, to produce similar sex ratios in consecutive years. Within-colony genetic relatedness, while strongly correlated with sex ratios within years, did not explain the year-to-year variation. It is suggested that extrinsic factors can limit the production of female sexuals, even when genetic relatedness is high enough to favor female production.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1432-0770Source: Springer Online Journal Archives 1860-2000Topics: BiologyComputer SciencePhysicsNotes: Abstract. The multicylinder somatic shunt cable model for passive neurones with differing time constants in each cylinder is considered in this paper. The solution to the model with general inputs is developed, and the parametric dependence of the voltage response is investigated. The method of analysis is straightforward and follows that laid out in Evans et al. (1992, 1994): (i) The dimensional problem is stated with general boundary and initial conditions. (ii) The model is fully non-dimensionalised, and a dimensionless parameter family which uniquely governs the behaviour of the dimensionless voltage response is obtained. (iii) The fundamental unit impulse problem is solved, and the solutions to problems involving general inputs are written in terms of the unit impulse solution. (iv) The large and small time behaviour of the unit impulse solution is examined. (v) The parametric dependence of the unit impulse upon the dimensionless parameter family is explored for two limits of practical interest. A simple expression for the principle relationship between the dimensionless parameter family is derived and provides insight into the interaction between soma and cylinders. A well-posed method for the solution of the dimensional inverse problem is presented.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 1432-0770Source: Springer Online Journal Archives 1860-2000Topics: BiologyComputer SciencePhysicsNotes: Abstract The multicylinder somatic shunt cable model for passive neurones with differing time constants in each cylinder is considered in this paper. The solution to the model with general inputs is developed, and the parametric dependence of the voltage response is investigated. The method of analysis is straightforward and follows that laid out in Evans et al. (1992, 1994): (i) The dimensional problem is stated with general boundary and initial conditions, (ii) The model is fully non-dimensionalised, and a dimensionless parameter family which uniquely governs the behaviour of the dimensionless voltage response is obtained, (iii) The fundamental unit impulse problem is solved, and the solutions to problems involving general inputs are written in terms of the unit impulse solution, (iv) The large and small time behaviour of the unit impulse solution is examined, (v) The parametric dependence of the unit impulse upon the dimensionless parameter family is explored for two limits of practical interest. A simple expression for the principle relationship between the dimensionless parameter family is derived and provides insight into the interaction between soma and cylinders. A well-posed method for the solution of the dimensional inverse problem is presented.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1432-8798Source: Springer Online Journal Archives 1860-2000Topics: MedicineNotes: Summary. We present the phylogenetic relationships of several picorna-like RNA viruses found in honey bees, with respect to 13 additional plant and animal positive-strand RNA viruses. Most of the honey bee viruses fall into an unnamed family of insect RNA viruses typified by the Drosophila C virus. Different bee viruses are broadly distributed within this group, suggesting either that the ability to infect honey bees has evolved multiple times, or that these viruses are generalistic in their abilities to infect insect hosts. At least one major change in gene order has occurred among the bee viruses, based on their phylogenetic affiliations. At the amino-acid level, the bee viruses differed by 15–28% at three conserved loci. Most differed by greater than 50% at the RNA level, indicating that sequence-based methods for bee virus identification must be tailored to at least three different virus clades independently.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1432-1394Keywords: Key words: Geoid determination – Integration kernels – Truncation errorSource: Springer Online Journal Archives 1860-2000Topics: Architecture, Civil Engineering, SurveyingNotes: Abstract. When Stokes's integral is used over a spherical cap to compute a gravimetric estimate of the geoid, a truncation error results due to the neglect of gravity data over the remainder of the Earth. Associated with the truncation error is an error kernel defined over these two complementary regions. An important observation is that the rate of decay of the coefficients of the series expansion for the truncation error in terms of Legendre polynomials is determined by the smoothness properties of the error kernel. Previously published deterministic modifications of Stokes's integration kernel involve either a discontinuity in the error kernel or its first derivative at the spherical cap radius. These kernels are generalised and extended by constructing error kernels whose derivatives at the spherical cap radius are continuous up to an arbitrary order. This construction is achieved by smoothly continuing the error kernel function into the spherical cap using a suitable degree polynomial. Accordingly, an improved rate of convergence of the spectral series representation of the truncation error is obtained.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 1432-1394Keywords: Key words. Gravimetric geoid determination ; Modified kernels ; Truncation error reductionSource: Springer Online Journal Archives 1860-2000Topics: Architecture, Civil Engineering, SurveyingNotes: Abstract. A deterministic modification of Stokes's integration kernel is presented which reduces the truncation error when regional gravity data are used in conjunction with a global geopotential model to compute a gravimetric geoid. The modification makes use of a combination of two existing modifications from Vaníček and Kleusberg and Meissl. The former modification applies a root mean square minimisation to the upper bound of the truncation error, whilst the latter causes the Fourier series expansion of the truncation error to coverage to zero more rapidly by setting the kernel to zero at the truncation radius. Green's second identity is used to demonstrate that the truncation error converges to zero faster when a Meissl-type modification is made to the Vaníček and Kleusberg kernel. A special case of this modification is proposed by choosing the degree of modification and integration cap-size such that the Vaníček and Kleusberg kernel passes through zero at the truncation radius.Type of Medium: Electronic ResourceURL: