We have studied the three quark system in a relativized version of the quark potential model with chromodynamics. With parameters consistent with those of an analogous study of meson spectroscopy we obtain a successful description of the spectrum of baryons. The model naturally explains the apparent absence of spin‐orbit interactions in baryons.

Baryons in a relativized quark model with chromodynamics

Preface 1 Carbon, the Earth and life: 11 Carbon and the basic requirements of life12 Chemical elements, simple compounds and their origins13 The origin of life14 Evolution of life and the atmosphere15 Major contributors to sedimentary organic matter 2 Chemical composition of biogenic matter: 21 Structure of natural products22 Carbohydrates23 Amino acids and proteins24 Lipids25 Lignins, tannins and related compounds26 Nucleotides and nucleic acids27 Geochemical implicatiions of compositional variation 3 Production, preservation and degradation of organic matter: 31 How and why organic-rich deposits form32 Controls on primary production33 Preservation and degradation of organic matter34 Depositional environments associated with accumulation of organic matter 4 Long-term fate of organic matter in the geosphere: 41 Diagenesis42 Humic material43 Coal44 Kerogen45 Catagenesis and metagenesis46 Temporal and geographical distribution of fossil organic carbon 5 Chemical stratigraphy 51 Biologically mediated transformations52 Examples of source indicators in recent sediments53 Diagenesis at the molecular level54 Source and environment indicators in ancient sediments and oil55 Thermal maturity and molecular transformations56 Palaeotemperature and age measurement57 Maturity of ancient sedimentary organic matter58 Isotopic palaeontology 6 The carbon cycle and climate 61 Global carbon cycle62 Changes in carbon reservoirs over geological time63 Palaeoclimatic variations64 Isotopic excursions at period boundaries65 Human influence on the carbon cycle 7 Anthropogenic carbon and the environment 71 Introduction72 Halocarbons73 Hydrocarbon pollution in aquatic environments74 Endocrine disrupting chemicals75 Environmental behaviour of selected xenobiotic compounds76 Factors affecting the rate of anthropogenic components Appendix 1: SI units usedAppendix 2: SI unit prefixesAppendix 3: Geological timescaleReferencesIndex

An introduction to organic geochemistry

http://www.zetaware.com/public/Pepper_and_corvi_1995_I.pdf

Simple kinetic models of petroleum formation. Part I : oil and gas generation from kerogen

Thermal cracking of kerogen in open and closed systems: determination of kinetic parameters and stoichiometric coefficients for oil and gas generation

Mudstone is the most abundant sedimentary rock and variously acts as sources, seals, and shale gas reservoirs in petroleum systems. Many important physicochemical properties of mudstones are strongly influenced by the mineralogy and size of deposited grains, and by diagenetic changes (precompaction and postcompaction); these are commonly predictable. The diverse composition of mudstones reflects input and hydrodynamic segregation of detrital materials to basins, primary production within basins, and diagenetic processes (both precipitation and dissolution) in the sediment. High-magnification observations both in modern and ancient sediments demonstrate that mudstones are texturally and mineralogically heterogeneous; this variability is not always readily apparent. Although some mud is indeed deposited by suspension settling out of low-energy buoyant plumes, textural analyses reveal that it is commonly dispersed by a combination of waves, gravity-driven processes, and unidirectional currents driven variously by storms and tides. Such dispersal mechanisms mean that muddy successions are typically organized into packages that can be interpreted using sequence stratigraphy. Early bioturbation homogenizes mud, whereas early chemical diagenesis can result in highly cemented zones developing, especially at stratal surfaces. The nature of deeper burial diagenesis, which involves compaction, mineral dissolution, recrystallization, mineral reorientation and lithification, and petroleum generation, is preconditioned by depositional and early diagenetic characteristics of the mud. Although the petrophysical properties of homogeneous mudstones are reasonably well known, the quantitative implications of heterogeneity for petroleum expulsion, retention, petroleum migration, seal capacity, acoustic anisotropy, and identification of shale gas reservoir sweet spots are essentially unexplored. Future work should seek to redress this position.

Mudstone diversity: Origin and implications for source, seal, and reservoir properties in petroleum systems

Simple kinetic models of petroleum formation. Part III : Modelling an open system

We consider the spectrum-generating algebra Sp(12,R) of the harmonic-oscillator quark model and show how it may be used to label the oscillator eigenstates. We give a new and direct method of constructing wave functions of definite symmetry type. We show that Sp(12,R) provides the most appropriate means of classifying the symmetry breaking produced by an anharmonic perturbation and we derive an algebraic mass formula for the N = 2 multiplets of the model, and indicate how the method may be generalized to arbitrary N. Finally we extend the present successful phenomenological analysis of the baryon spectrum performed by Isgur and Karl, and discuss the possibility that the ..delta..D35(1925) resonance is evidence for a (56,1/sup -/) multiplet corresponding to excitation of new gluonic degrees of freedom within baryons.

Role of Sp(12,R) in the harmonic-oscillator quark model

The possibility that the D35(1925) resonance is evidence for a [56, 1-] multiplet corresponding to excitation of new gluonic degrees of freedom within baryons is examined in detail. A new group-theoretical analysis of a successful mass formula for the N=2 multiplets of the nonrelativistic harmonic-oscillator quark model is also presented. Some results for the N=3 level are also given together with an outline of the method for generalization to any degree of excitation of the system.

P. J. Corvi

Papers

Simple kinetic models of petroleum formation. Part I : oil and gas generation from kerogen

Simple kinetic models of petroleum formation. Part III : Modelling an open system

Role of Sp(12,R) in the harmonic-oscillator quark model

Is the $\Delta$ D35 (1925) Resonance Evidence for New Baryonic Degrees of Freedom?

Hyperfine interactions in negative parity baryons and the ΔD35(1925) resonance