Elements of mathematics : containing geometry, conic sections, trigonometry ... : to which is prefixed the first principles of algebra, by way of introduction for the use of the Royal Academy of Artillery at Woolwich : vol. I and II /

Mode of access: Internet.

An elementary treatise on conic sections and algebraic geometry : with numerous examples and hints for their solution, especially designed for the use of beginners /

Mode of access: Internet.

Elements of conic sections. /

Mode of access: Internet.

Elements of analytical geometry: embracing the equations of the point, the straight line, the conic sections, and surfaces of the first and second order.

Mode of access: Internet.

Elements of analytical geometry; embracing the equations of the point, the straight line, the conic sections, and surfaces of the first and second order,

Mode of access: Internet.

A treatise on plane co-ordinate geometry : as applied to the straight line and the conic sections : with numerous examples /

Mode of access: Internet.

Solutions of examples in conic sections : triated geometrically /

Mode of access: Internet.

Successive approximation methods for solving optimality problems. USSR.

Translation of 2 articles from the Russian journal.

Reservoir area-capacity table by conic method : Hydrologic Engineering Center computer program 23-J2-L233.

At head of cover title: Generalized computer program.

Un algorithme pour l'approximation simultanee de deux grandeure...

Thesis (doctoral)--

The principles of projective geometry applied to the straight line and conic,

Mode of access: Internet.

An empirical study of three stochastic approximation techniques applicable to sensitivity testing (U)

Photocopy.

Patched 1 conditional null allele in mice

The patched gene (Ptc) is a member of the hedgehog signaling pathway which plays a central role in the development of many invertebrate and vertebrate tissues. In addition, Ptc and a number of other pathway members are mutated in some common human cancers. Patched is the receptor for the hedgehog ligand and in the mouse ablation of the Ptc gene leads to developmental defects and an embryonic lethal phenotype. Here we describe a conditional Ptc allele in mice which will have utility for the temporospatial ablation of Ptc function. genesis 36:158-161, 2003. (C) 2003 Wiley-Liss, Inc.

New approximation for free surface flow of groundwater: capillarity correction

An existing capillarity correction for free surface groundwater flow as modelled by the Boussinesq equation is re-investigated. Existing solutions, based on the shallow flow expansion, have considered only the zeroth-order approximation. Here, a second-order capillarity correction to tide-induced watertable fluctuations in a coastal aquifer adjacent to a sloping beach is derived. A new definition of the capillarity correction is proposed for small capillary fringes, and a simplified solution is derived. Comparisons of the two models show that the simplified model can be used in most cases. The significant effects of higher-order capillarity corrections on tidal fluctuations in a sloping beach are also demonstrated. (c) 2004 Elsevier Ltd. All rights reserved.

Two-dimensional approximation for tide-induced watertable fluctuations in a sloping sandy beach

The prediction of watertable fluctuations in a coastal aquifer is important for coastal management. However, most previous approaches have based on the one-dimensional Boussinesq equation, neglecting variations in the coastline and beach slope. In this paper, a closed-form analytical solution for a two-dimensional unconfined coastal aquifer bounded by a rhythmic coastline is derived. In the new model, the effect of beach slope is also included, a feature that has not been considered in previous two-dimensional approximations. Three small parameters, the shallow water parameter (epsilon), the amplitude parameter (a) and coastline parameter (beta) are used in the perturbation approximation. The numerical results demonstrate the significant influence of both the coastline shape and beach slopes on tide-driven coastal groundwater fluctuations. (c) 2004 Elsevier Ltd. All rights reserved.