339 research outputs found
Generalized measures for physical properties of nonperiodic chains
No full textPT: J; CR: AVISHAI Y, 1990, PHYS REV B, V41, P5492 BORN M, 1965, PRINCIPLES OPTICS BURROWS BL, 1991, J PHYS A-MATH GEN, V24, P3979 DAVISON SG, 1992, BASIC THEORY SURFACE GUMBS G, 1989, J PHYS A-MATH GEN, V22, P951 KIANG D, 1990, AM J PHYS, V58, P1200 KOHMOTO M, 1987, PHYS REV LETT, V58, P2436 KOLAR M, 1991, PHYS REV B, V43, P1034 PATTNAIK RK, 1992, J PHYS A-MATH GEN, V25, P577 THAKUR PK, 1992, J PHYS-CONDENS MAT, V4, P6095; NR: 10; TC: 5; J9: PHYS REV B; PG: 7; GA: QL717Source type: Electronic(1
Pseudo-state theory of surface ion neutralization
No full textThe theory of resonant charge transfer is refined to deal with the overlap between the ion orbital and substrate orbitals, to introduce new numerical methods for estimating the interaction and most significantly to construct pseudo-states to model realistic densities of states for substrates.PT: J; CR: ADURU S, 1988, SURF SCI, V205, P269 AMOS AT, 1989, ADV CHEM PHYS, V76, P335 AMOS AT, 1989, SOLID STATE COMMUN, V71, P449 BLOSS W, 1978, SURF SCI, V72, P277 BRAKO R, 1981, SURF SCI, V108, P253 BURROWS BL, 1984, Q APPL MATH, V42, P73 BURROWS BL, 1990, J PHYS A-MATH GEN, V23, P1101 CHADI DJ, 1975, PHYS STATUS SOLIDI B, V68, P405 HERMAN F, 1963, ATOMIC STRUCTURE CAL HOFFMAN AJ, 1953, DUKE MATH J, V20, P37 IHM J, 1980, PHYS REV B, V21, P4592 MUDA Y, 1980, SURF SCI, V97, P283 MUDA Y, 1988, NUCL INSTRUM METH B, V33, P388 MUDA Y, 1988, PHYS REV B, V37, P7048 MURRELL JN, 1985, CHEM BOND SULSTON KW, 1988, CHEM PHYS, V124, P411 SULSTON KW, 1988, PHYS REV B, V37, P9121 SULSTON KW, 1988, SURF SCI, V197, P555 WEAKLIEM PC, 1990, SURF SCI, V232, L219 WEISENDANGER R, 1990, SURF SCI, V232, P1 WILKINSON JH, 1965, ALGEBRAIC EIGENVALUE; NR: 21; TC: 5; J9: SURFACE SCI; PG: 10; GA: GB311Source type: Electronic(1
Many-electron theory of resonant charge transfer: Role of surface states in He and He+ scattering off Si(100)
No full textA many-electron theory of resonant charge transfer, originally formulated for the scattering of an atom with an empty valence orbital from a surface, is extended to treat the case where the valence orbital is initially occupied by one or two electrons. The scattering of He and He+ from the Si(001) surface is investigated. The interaction is assumed to be with the narrow band of surface states, and not the much wider bulk band. As a result, considerable oscillations are found in the ionization and/or neutralization probabilities as a function of the incident energy.PT: J; CR: AMOS AT, 1989, ADV CHEM PHYS, V76, P335 AMOS AT, 1989, SOLID STATE COMMUN, V71, P449 BLOSS W, 1978, SURF SCI, V72, P277 BRAKO R, 1981, SURF SCI, V108, P253 BURROWS BL, 1984, Q APPL MATH, V42, P73 BURROWS BL, 1990, J PHYS A-MATH GEN, V23, P1101 BURROWS BL, 1991, SURF SCI, V253, P365 CHADI DJ, 1975, PHYS STATUS SOLIDI B, V68, P405 HAGSTRUM HD, 1954, PHYS REV, V96, P336 HAGSTRUM HD, 1961, PHYS REV, V122, P83 HERMAN F, 1963, ATOMIC STRUCTURE CAL IHM J, 1980, PHYS REV B, V21, P4592 MUDA Y, 1980, SURF SCI, V97, P283 MUDA Y, 1988, NUCL INSTRUM METH B, V33, P388 MUDA Y, 1988, PHYS REV B, V37, P7048 PAULING L, 1935, INTRO QUANTUM MECHAN ROBERTS N, 1990, SURF SCI, V236, P112 SOUDA R, 1985, SURF SCI, V150, L59 SOUDA R, 1986, NUCL INSTRUM METH B, V15, P114 SOUDA R, 1986, NUCL INSTRUM METH B, V15, P138 SOUDA R, 1986, SURF SCI, V176, P657 SULSTON KW, 1988, PHYS REV B, V37, P9121 SULSTON KW, 1988, SURF SCI, V197, P555 SULSTON KW, 1989, SURF SCI, V244, P543 WEAKLIEM PC, 1990, SURF SCI, V232, L219 WEISENDANGER R, 1990, SURF SCI, V232, P1; NR: 26; TC: 4; J9: PHYS REV B; PG: 11; GA: HZ245Source type: Electronic(1
Measurement of disorder in non-periodic sequences
No full textAn information theoretic measure is introduced to compare the disorder in non-periodic sequences. It is shown that the measure correctly distinguishes quasiperiodic and aperiodic sequences which have been deduced from earlier studies using diffraction patterns, although it is often necessary to use a set of measures, depending on the order of the source used. The particular sequences studied are the Thue-Morse sequence and the generalizations of the golden mean sequence commonly studied in connection with quasicrystals.PT: J; CR: ALI MK, 1988, PHYS REV B, V38, P7091 BOMBIERI E, 1986, J PHYS-PARIS, V47, P19 BOMBIERI E, 1987, CONT MATH, V64, P241 BURROWS BL, 1989, INT J MATH ED SCI TE, V20, P913 CHENG Z, 1988, PHYS REV B, V37, P4375 GUMBS G, 1988, J PHYS A, V21, L517 GUMBS G, 1988, PHYS REV LETT, V60, P1081 GUMBS G, 1989, J PHYS A-MATH GEN, V22, P951 HAMMING RW, 1980, CODING INFORMATION T HOLZER M, 1988, PHYS REV B, V38, P1709 HOLZER M, 1988, PHYS REV B, V38, P5756 KOLAR M, 1990, PHYS REV B, V41, P7108 KOLAR M, 1991, PHYS REV B, V43, P1034 MA HR, 1988, J PHYS C SOLID STATE, V21, P4311 MERLIN R, 1985, PHYS REV LETT, V55, P1768 MORSE M, 1921, AM J MATH, V43, P35 MORSE M, 1921, T AM MATH SOC, V22, P84 NIU Q, 1986, PHYS REV LETT, V57, P2057 PENROSE R, 1974, B I MATH APPL, V10, P266 QIN MG, 1990, J PHYS-CONDENS MAT, V2, P1059 RIKLUND R, 1987, INT J MOD PHYS B, V1, P121 SHANNON CE, 1949, MATH THEORY COMMUNIC SHECHTMAN D, 1984, PHYS REV LETT, V53, P1951 THUE A, 1906, NORSKE VID SELSK IMN, V7, P1 THUE A, 1912, NORSKE VID SELSK IMN, V1, P1; NR: 25; TC: 13; J9: J PHYS-A-MATH GEN; PG: 9; GA: GC466Source type: Electronic(1
Recursive procedures for measuring disorder in non-periodic sequences
No full textRecursive procedures are found for calculating the kth-order entropy of non-periodic sequences. These entropies are used as measures of disorder of the sequences and we treat: the Fibonacci sequence and generalizations; the Thue-Morse sequence together with generalizations and the period-doubling sequence. A discussion of the relative ordering of the Thue-Morse and the Fibonacci sequences is given and it is found too simplistic to use any one measure for comparison.PT: J; CR: BURROWS BL, 1991, J PHYS A-MATH GEN, V24, P3979 CHENG Z, 1988, PHYS REV B, V37, P4375 DALLESSANDRO G, 1990, PHYS REV LETT, V64, P1609 GUMBS G, 1989, J PHYS A-MATH GEN, V22, P951 GYORGYI G, 1985, PHYS REV A, V31, P3477 HARTLEY RVL, 1928, BELL SYST TECH J, V7, P535 KHINCHIN AI, 1957, MATH F INFORMATION T KLUIVING R, 1992, PHYSICA A, V183, P405 KLUIVING R, 1992, PHYSICA A, V183, P67 KLUIVING R, 1992, PHYSICA A, V183, P96 QIN MG, 1990, J PHYS-CONDENS MAT, V2, P1059 RIKLUND R, 1987, INT J MOD PHYS B, V1, P121 RYU CS, 1992, PHYS REV B, V46, P5162 RYU CS, 1993, PHYS REV B, V48, P132 SHANNON CE, 1948, BELL SYST TECH J, V27, P379 SHANNON CE, 1948, BELL SYST TECH J, V27, P623 SHANNON CE, 1949, MATH THEORY COMMUNIC WELSH D, 1988, CODES CRYPTOGRAPHY; NR: 18; TC: 6; J9: PHYSICA A; PG: 15; GA: RK763Source type: Electronic(1
Artificial burrows with basal chambers are preferred by pygmy bluetongue lizards, Tiliqua adelaidensis
No full textAuthor version made available in accordance with the Publisher's policyNatural refuges are sometimes supplemented with artificial refuges to enhance populations of endangered species, or to improve the success of translocation and relocation programs. The design and structure of these artificial structures should incorporate key features of natural refuges. We aimed to improve the design of artificial burrows currently used in the conservation of the pygmy bluetongue lizard, Tiliqua adelaidensis, by comparing burrows with or without a basal chamber. We found that lizards chose burrows with chambers significantly more often, but that neither the size of the chamber, nor the substrate lining the chamber influenced the choice. Incorporating a basal chamber into the design of artificial burrows should provide more favourable artificial refuges for these lizards and should be incorporated into future conservation management programs
Consequences of climate-driven biodiversity changes for ecosystem functioning of North European rocky shores
No full textWe review how intertidal biodiversity is responding to globally driven climate change,
focusing on long-term data from rocky shores in the British Isles. Physical evidence of warming
around the British Isles is presented and, whilst there has been considerable fluctuation, sea surface
temperatures are at the highest levels recorded, surpassing previous warm periods (i.e. late 1950s).
Examples are given of species that have been advancing or retreating polewards over the last 50 to
100 yr. On rocky shores, the extent of poleward movement is idiosyncratic and dependent upon life
history characteristics, dispersal capabilities and habitat requirements. More southern, warm water
species have been recorded advancing than northern, cold water species retreating. Models have
been developed to predict likely assemblage composition based on future environmental scenarios.
We present qualitative and quantitative forecasts to explore the functional consequences of changes
in the identity, abundance and species richness of gastropod grazers and foundation species such as
barnacles and canopy-forming algae. We forecast that the balance of primary producers and secondary
consumers is likely to change along wave exposure gradients matching changes occurring
with latitude, thereby shifting the balance between export and import of primary production.
Increases in grazer and sessile invertebrate diversity are likely to be accompanied by decreasing
primary production by large canopy-forming fucoids. The reasons for such changes are discussed in
the context of emerging theory on the relationship between biodiversity and ecosystem functioning.
KEY WORDS: Climate change · Intertidal · Range shifts · Biodiversity · Ecosystem functioning ·
Northeast Atlanti
Melanotaenia nigrans Richardson
No full textMelanotaenia nigrans Richardson Blackbanded Rainbowfish Extremely rare within the Kimberley region, Melanotaenia nigrans is only known from one small tributary in Dominic Creek near the mouth of the King Edward River (Fig. 21), and although WAM records suggest it is present in Yampi Sound, recent examination of these specimens by the senior author revealed them to be M. australis. The species is also found in coastal drainages of the Northern Territory, including Groote Eylandt and the northern tip of Cape York (Allen et al. 2002).Published as part of Morgan, David L., Allen, Gerald R., Pusey, Bradley J. & Burrows, Damien W., 2011, 2816, pp. 1-64 in Zootaxa 2816 on page 1
A visual demonstration of supramolecular chemistry: observable fluorescence enhancement upon host-guest inclusion
No full textPT: J; CR: BOZZELLI JW, 1982, J CHEM EDUC, V59, P787 BRESLOW R, 1998, J CHEM EDUC, V75, P705 BUCCIGROSS JM, 1996, J CHEM EDUC, V73, P275 BURROWS HD, 1983, J CHEM EDUC, V60, P228 CATENA GC, 1989, ANAL CHEM, V61, P905 CONN MM, 1997, CHEM REV, V97, P1647 CONRADI S, 1997, J CHEM EDUC, V74, P1122 CRAM DJ, 1992, NATURE, V356, P29 CRAMER F, 1967, J AM CHEM SOC, V89, P14 DIEDERICH F, 1990, J CHEM EDUC, V67, P813 EBBESEN TW, 1989, J PHYS CHEM-US, V93, P7139 FEMIA RA, 1985, ENVIRON SCI TECHNOL, V19, P155 FYFE MCT, 1997, ACCOUNTS CHEM RES, V30, P393 HAMILTON AD, 1990, J CHEM EDUC, V67, P821 KONDO J, 1976, J BIOCH, V79, P393 LACKOWICZ JR, 1983, PRINCIPLES FLUORESCE, CH7 LEHN JM, 1988, ANGEW CHEM INT EDIT, V27, P89 LERNER DA, 1989, ANAL CHIM ACTA, V227, P297 LI S, 1992, CHEM REV, V92, P1457 WAGNER BD, 1998, J PHOTOCH PHOTOBIO A, V114, P151 ZARZYCKI PK, 1996, J CHEM EDUC, V73, P459 ZIESSEL RF, 1997, J CHEM EDUC, V74, P673; NR: 22; TC: 6; J9: J CHEM EDUC; PG: 4; GA: 274KQSource type: Electronic(1
Multisite bond and overlap treatment of polymer-chain band structure
No full textThe usual tight-binding (TB) approximation, employed in electronic structure calculations, is extended to include the more-distant neighbor sites than the first. In doing so, a simple power law is adopted to describe the bond and overlap contributions, which enables the energy dispersion relation to be obtained in a closed analytic form. The resulting energy band structure has markedly different features from its TB Counterpart to which it reduces in the appropriate limits. In particular, local extrema always occur at the TB stationary values, although these may not both be band edges. Another intermediate critical point may arise, which is one of the band edges, the other being located at one of the TB extrema. (C) 2003 Wiley Periodicals, Inc.PT: J; CR: ALSTRUP I, 1968, PHYS STATUS SOLIDI, V28, P555 ANDRE JM, 1990, INT J QUANTUM CHEM S, V24, P65 DAVISON SG, 1967, J SURF SCI, V6, P323 DAVISON SG, 1969, CHEM PHYS LETT, V3, P424 DAVISON SG, 1970, SOLID STATE PHYS, V25, P1 DAVISON SG, 1972, INT J QUANTUM CHEM, V6, P387 DAVISON SG, 1976, INT J QUANTUM CHEM, V10, P867 DAVISON SG, 1986, J PHYS CHEM-US, V90, P652 DAVISON SG, 1996, BASIC THEORY SURFACE DAVISON SG, 2002, ACTA PHYS CHIM DEBRE, V189, P34 FAIRBAIRN WM, 1968, SURF SCI, V9, P439 FUJIMOTO H, 1987, CHEM PHYS LETT, V141, P485 GILBERT TL, 1962, J MATH PHYS, V3, P107 HOFFMANN R, 1991, MACROMOLECULES, V24, P3725 KARPFEN A, 1982, PHYS SCR T, V1, P79 KOSTER GF, 1954, PHYS REV, V95, P1167 LAVIS DA, 1986, J PHYS C SOLID STATE, V19, P3125 LOWDIN PO, 1950, J CHEM PHYS, V18, P365 LOWDIN PO, 1951, J CHEM PHYS, V19, P1579 MCKINNON BA, 1995, PHYS REV B, V52, P14531 MIRABELLA DA, 1994, AM J PHYS, V62, P162 MIRABELLA DA, 1994, PHYS REV B, V50, P12152 MIRABELLA DA, 1998, INT J QUANTUM CHEM, V68, P285 MISKOVIC ZL, 1996, CHEM PHYS LETT, V260, P647 RUEDENBERG K, 1961, J CHEM PHYS, V34, P1878 SLATER JC, 1930, PHYS REV, V35, P509 SPRINGBORG M, 1989, PHYS REV B, V40, P3333 SPRINGBORG M, 2000, INT J QUANTUM CHEM, V77, P843 TAFERNER WT, 1997, CHEM PHYS LETT, V269, P171 TOMASEK M, 1960, J CZECH J PHYS B, V10, P268; NR: 30; TC: 0; J9: INT J QUANTUM CHEM; PG: 6; GA: 717VPSource type: Electronic(1
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