LEWIS CHURCH: Combinatoric Models of Information Retrieval Ranking Methods and Performance Measures for Weakly-Ordered Document Collections (Under the direction of Robert M. Losee) This dissertation answers three research questions: (1) What are the characteristics of a combinatoric measure, based on the Average Search Length (ASL), that performs the same as a probabilistic version of the ASL?;...

Mountain ranges cover around one-half of Iran, and Zagros ecosystem is considered as one of an important biological site in Iran. Physiographic factors such as altitude and aspect have an important role in plant species distribution. This study was conducted in the Nawa mountain ecosystem in the western side of Zagros ranges, located in the western zone of Iran in 2016. The experiment aim was t...

Dendroclimatology offers the unique opportunity to reconstruct past climate at annual resolution and wood from historical buildings can be used extend such information back in time up several millennia. However, varying often unclear origin of timbers affects sensitivity individual tree-ring samples. Here, we compare width density 143 living larch (Larix decidua Mill.) trees seven sites along a...

in this paper, a new formula is applied for the calculation of gravity anomalies from a cylinder model representing a geological body. compared to conventional methods, this new development allows the cylinder to be freely oriented in space. 38 gravity forward models are produced each of which anomaly attributes are calculated. then a linear relationship is established between attributes and so...

Earthquake has always endangered cities. This article mainly focuses on the question “whether seismic damages could be diminished through the presentation a preventive operational pattern dealing with physical and nonphysical features of civil defense”. Tehran, the most populous metropolis among Iranian cities is to the south of Alborz mountain range, located on potentially dangerous fault- lin...

A scheme for introducing mountain wave-induced temperature pertubations in a microphysical PSC model has been developed. A data set of temperature fluctuations attributable to mountain waves as computed by the Mountain Wave Forecast Model (MWFM-2) has been used for the study. The PSC model has variable microphysics, enabling different nucleation mechanisms for nitric acid trihydrate, NAT, to be...

We present in this paper a polynomial fitting method applicable to segments of footprints measured by the Geoscience Laser Altimeter System (GLAS) to estimate glacier thickness change. Our modification makes the method applicable to complex topography, such as a large mountain glacier. After a full analysis of the planar fitting method to characterize errors of estimates due to complex topograp...

Chlamydia is an obligate intercellular and Gram negative coccobacilli and one of the most important factors of abortion in ruminants especially in ewes. Purpose of this investigation Phylogenetic Analysis of Chlamydia abortus Isolated from fetus Aborted ewes of Alborz Province. In this study, of 100 aborted fetuses abomasum of 32 sheeps flocks were Alborz Province, DNA was then extracted IGS-Sr...