[en] The Canadian Association of Petroleum Producers (CAPP) represents about 170 crude oil and natural gas exploration, development and production companies in regulatory hearings and legal proceedings. Its principal role is to enhance the economic well-being and sustainability of the Canadian upstream petroleum industry. This presentation explores the role that information technology (IT) plays in knowledge and information management and how this role relates to meeting Canada's target for greenhouse gas emissions reductions set by the Kyoto Protocol. Actions such as the Voluntary Challenge Registry (VCR) and emissions reductions trading are re-visited and the information requirements associated with these actions are highlighted. It is shown that among others, emissions databases between jurisdictions (provincial, national, international) have to be integrated, reduction claims must be tracked, verified and cross-referenced to eliminate double counting, comprehensive databases to monitor all sources of GHG have to be created, and financial links have to be created and maintained. All of these tasks would be nearly impossible without information technology. Indeed, it was predicted that the importance of information technology will grow with the advance of globalization as a result of more complex interlocking of financial and trade matters, and increasing global environmental regulations. 1 fig

[en] A review of the state of the Canadian oil and gas industry for 1997 was presented. In 1997, capital investment levels were at $19 billion with oil, gas and gas by-products production valued at $31 billion. Exports were strong and set to grow further. As far as the Yukon is concerned, the availability of increased incentives and the announcement of a common royalty regime for the Territory have helped to increase interest by outside capital. Ongoing efforts are being made to include First Nations communities in the public consultation processes, and to ensure significant benefits to First Nation people from any development. The industry's initiatives and approaches to exploration, development and production were outlined. Environmental initiatives to protect the wilderness, and the existing ecosystem were described with examples from Alberta (Special Places 2000) and from British Columbia (BC Northern Rockies (Muskwa-Kechika; marine protected areas). 1 fig

[en] The design and construction of a wide-range, automated film balance and a set of experiments on a well-documented material to test the instrument during its development are described. The balance can be operated in the temperature range 5-50⁰C. It can measure surface tension differences up to 50 mN m^-1 with an imprecision of +/- 0.01 mN m^-1. The measurements of the liquid-expanded (LE)-liquid-compressed (LC) and the liquid-vapor transitions in pentadecanoic acid monolayers on water to confirm recent suggestions that long-standing ideas about these two transitions might be in error and that a thorough reexamination of many classic measurements will be necessary

No abstract available

[en] Determining the precise etiology of an intraventricular mass can be a difficult diagnostic problem. CT and angiographic findings were reviewed in a series of 73 patients who had intraventricular masses. The histologic diagnosis can be suggested preoperatively by an analysis of the frequency of lesions occurring at a given ventricular location, lesion density before and after administration of contrast material, age, and sex of the patient, morphologic appearance of the mass, and presence or absence of hydrocephalus. Angiography is useful when meningioma, choroid plexus papilloma and carcinoma, or arteriovenous malformation are considered

[en] We present a new approach for solving phase equilibria problems in multicomponent systems together with several applications. A mathematical framework is developed that provides a method for generalizing the thermodynamics of a finite-component system to that of a system with an infinite number of components: a polydisperse system. Two new functions, the mole fraction distribution function and the mole fraction density function, play a key role in our method. The phase equilibria conditions are written in terms of these functions and are formally solved. We illustrate the utility of our approach by solving, for a polydisperse generalization of the van der Waals model, three phase-equilibria problems: (1) the fractionation of a polydisperse impurity dissolved in a solvent; (2) the shift of the critical temperature and density due to the presence of a polydisperse impurity; (3) the calculation of the cloud-point surface and critical point of a completely polydisperse system

[en] We report on the current state of surface slope metrology on deformable mirrors for soft x-rays at the Advanced Light Source (ALS). While we are developing techniques for in situ at-wavelength tuning, we are refining methods of ex situvisible-light optical metrology to achieve sub-100-nrad accuracy. This paper reports on laboratory studies, measurements and tuning of a deformable test-KB mirror prior to its use. The test mirror was bent to a much different optical configuration than its original design, achieving a 0.38 micro-radian residual slope error. Modeling shows that in some cases, by including the image conjugate distance as an additional free parameter in the alignment, along with the two force couples, fourth-order tangential shape errors (the so-called bird shape) can be reduced or eliminated.

[en] The critical-point conditions for a polydisperse mixture are shown to be equivalent to those for the existence of nontrivial solutions to two homogeneous integral equations of the Fredholm type. This mathematically rigorous treatment is not dependent on the form of any particular model free energy and hence shows that there is no formal distinction between the critical-point conditions of a polydisperse fluid and those conditions derived by Gibbs for the critical point of a mixture with a finite number of components. Using the method of Fredholm, we express the critical-point conditions in terms of the zeros of two absolutely convergent expansions, and demonstrate how the expansions may be used to determine the shifts in critical density and temperature caused by changes in the composition of the fluid

[en] Experiments designed to determine the removal rates and mechanisms of various radioactive trace metals from the water of Narragansett Bay were performed in the spring and early summer in 150-liter microcosms simulating the bay. Overall removal rates were first order for all elements studied in the spring (⁵⁴Mn, ⁵⁸Co, ⁵⁹Fe, ⁶⁵Zn, /sup 115m/Cd) and most elements studied in the summer (⁵⁸Co, ⁶⁵Zn, ⁵⁹Fe, ¹³⁴Cs, ²¹⁰Po, ²²⁸Th). For those elements studied in both seasons, removal was slower in the summer than in the spring. During the summer experiment ⁵⁴Mn, ⁵¹Cr, and ⁷⁵Se showed rapid first order removal in the initial 1 to 2 weeks followed by much slower removal. The seasonal differences appear to be the result of the association of the metals with low molecular weight organic compounds present only during the summer. Mass balance shows that the major removal reservoirs during the spring were the tank walls, suspended sediment, and the upper layers of the sediment. The seasonal behavior of the metals in the tanks was qualitatively similar to that of some radionuclides and stable metals studied in the bay

[en] We describe a general perturbation method that can be used to solve the equilibrium and critical-point conditions for model systems described by an analytic Helmholtz free energy. The general technique is developed within the framework of continuous or polydisperse systems; it may be applied to systems with discrete components, as well as to systems described by a continuous distribution of components. The expansion is based on the assumption that the microscopic parameters characterizing the system may be expressed as those of a reference system plus a series of ''small'' corrections. Explicit formulas for the first- and second-order solutions to the equilibrium and critical-point conditions are given. The low-order perturbation solutions will be useful when the phase boundaries of the system are close to those of the reference system