The Thirteen Towers of Chankillo run north to south along a low ridge within a fourth-century B.C.E. ceremonial complex in north coastal Peru. From evident observing points within the adjacent buildings to the west and east, they formed an artificial toothed horizon that spanned-almost exactly-the annual rising and setting arcs of the Sun. The Chankillo towers thus provide evidence of early sol...

In April 2003, UCLA researchers conducted test run T466 at the Stanford Linear Accelerator Center with their newly designed electromagnetic calorimeter towers composed of tungsten powder and scintillating fibers. The prototype’s energy resolution, uniformity of response, and linearity were measured using an electron beam with a momentum of up to 10 GeV. The measured energy resolution was 17%/ √...

In [BGLM] and [GLNP] it was conjectured that if H is a simple Lie group of real rank at least 2, then the number of conjugacy classes of (arithmetic) lattices in H of covolume at most x is x log x/ log log x where γ(H) is an explicit constant computable from the (absolute) root system of H . In this paper we prove that this conjecture is false. In fact, we show that the growth is at rate x log ...

Upgrading the voltage level of a transmission line is named as one solution to increase the transmitted power. This paper introduces the results of a research project in which the upgrade of Saravan-Sooran double circuit transmission system from 63 kV to 230 kV is studied. In this context, the towers remain in their current locations, where the new structure of towers and insulators as well as ...

Ziggurat is a meta-language system that permits programmers to develop Scheme-like macros for languages with nontrivial static semantics, such as C or Java (suitably encoded in an S-expression concrete syntax). Ziggurat permits language designers to construct “towers” of language levels with macros; each level in the tower may have its own static semantics, such as type systems or flow analyses...

A simulation approach to the stochastic growth of bacterial towers is presented, in which a non-uniform and finite nutrient supply essentially determines the emerging structure through elementary chemotaxis. The method is based on cellular automata and we use simple, microscopic, local rules for bacterial division in nutrient-rich surroundings. Stochastic nutrient diffusion, while not crucial t...