Early search for supersymmetric dark matter models at the LHC without missing energy

We investigate early discovery signals for supersymmetry at the Large Hadron Collider without using information about missing transverse energy. Instead we use cuts on the number of jets and isolated leptons (electrons and/or muons). We work with minimal supersymmetric extensions of the standard model, and focus on phenomenological models that give a relic density of dark matter compatible with the WMAP measurements. An important model property for early discovery is the presence of light sleptons, and we find that for an integrated luminosity of only 200--300 pb$^{-1}$ at a center-of-mass energy of 10 TeV models with gluino masses up to $\sim 700$ GeV can be tested.Comment: 28 pages, 12 figures; published versio

ESTIMATING THE BENEFITS OF GROUNDWATER CONTAMINATION CONTROL

In this paper, a conceptual model for estimating option price for groundwater quality protection is developed, and the effets of subjective demand and supply uncertainty and other variables on option price are estimated. A contingent valuation study to measure option price for groundwater quality protection was conducted in southwestern Georgia. Valuation results suggest that the monetary benefits to citizens of protecting groundwater supplies from agricultural chemical contamination are quite large.Environmental Economics and Policy,

ESTIMATING REVENUE-CAPTURE POTENTIAL ASSOCIATED WITH PUBLIC AREA RECREATION

A traditional contingent valuation approach and the “"trip response method"” were examined as potential techniques for measuring public area recreation revenue-capture potential. Empirical results suggest that both methods are useful for assessing revenue-capture potential. Additional research on alternative methods for assessing recreation revenue-capture potential is encouraged.Resource /Energy Economics and Policy,

A PROPOSED METHODOLOGY FOR ESTIMATING ECOREGIONAL VALUES FOR OUTDOOR RECREATION IN THE UNITED STATES

This paper provides a methodology for the estimation of recreational demand functions and values using an ecoregional approach. Ten ecoregions in the continental US were defined based on similarly functioning ecosystem characters. The individual travel cost method was employed to estimate the recreational demand functions for activities such as motorboating and waterskiing, developed and primative camping, coldwater fishing, sightseeing and pleasure driving, and big game hunting for each ecoregions. Estimates of per trip net income value range from $12.93 to$218.38 while per day estimates range from $4.31 to$109.19. While our ecoregional approach differs conceptually from previous work, our results appear consistent with the previous travel cost method valuation studies. (Missing tables 1,2,3,4,5 and 6)Recreation, ecoregion, travel cost method, truncated poisson model, Resource /Energy Economics and Policy,

Silica Froth: An Indicator of Thatch Artchitecture

Archaeological reports of silica froth are noted from Kansas to Texas, and are usually interpreted as evidence of burned grass- or cane-thatched buildings. However, many archaeological excavations in the Caddoan region fail to mention this material. Does this reflect idiosyncratic factors in the formation of silica froth, lack of expertise on the part of excavators/analysts, or differential recovery techniques? Archaeological and experimental data indicate that Caddoan houses frequently left silica froth as a residue when they burned. The implications are that archaeologists may be missing this key architectural item and that silica froth may be used to infer the presence of a house in the absence of traditional features such as post molds

Kinetic decoupling of neutralino dark matter

After neutralinos cease annihilating in the early Universe, they may still scatter elastically from other particles in the primordial plasma. At some point in time, however, they will eventually stop scattering. We calculate the cross sections for neutralino elastic scattering from standard-model particles to determine the time at which this kinetic decoupling occurs. We show that kinetic decoupling occurs above a temperature $T\sim$ MeV. Thereafter, neutralinos act as collisionless cold dark matter.Comment: Replaced with revised version, new references adde

Childhood predictors of successful self-reported delinquents

The main aim of this research is to investigate the childhood predictors of successful self-reported delinquents, defined as those who were not convicted. In the Cambridge Study in Delinquent Development (CSDD), 411 London males have been followed up from age 8 to age 61. Self-reported offending was measured for the whole sample for ages 10–14, 15–18, 27–32, and 42–47, for five crimes: burglary, theft of a vehicle, theft from a vehicle, shoplifting, and vandalism. The prevalence of self-reported offending was 64% at ages 10–18 and 11% at ages 27–47, compared with the prevalence of convictions of 23% and 8% respectively. Successful self-reported delinquents were defined as those who offended between ages 10 and 18 but were not convicted up to age 26; 126 successful delinquents were compared with 120 convicted delinquents. Sixteen childhood factors, including attainment, self-control, socioeconomic, parental, family and behavioural factors, predicted successful self-reported delinquents. The most important independent predictors were committing less serious and fewer offences as well as high school attainment, unconvicted parents, low risk-taking, and unseparated families

Light-in-flight recording. 5: Theory of slowing down the faster-than-light motion of the light shutter

Light-in-flight recording by holography uses a picosecond pulse for the reference beam, which like a sheet of light intersects the hologram plate and produces a sensitivity area that with a speed faster than light moves over the plate like a light shutter. If, however, the front of the reference pulse by diffraction in a grating is tilted relative to its direction of motion, the velocity of the light shutter can be slowed down resulting in increased recording time. The practical result using a reflection grating was a true recording that corresponded to a time compression of two to one. To minimize distortions of the recorded pulse shape we studied intersections that are identical for apparent (ellipsoidal) and true (spheroidal) wavefronts

THE USE OF PRIVATE LANDS IN THE U.S. FOR OUTDOOR RECREATION: RESULTS OF A NATIONWIDE SURVEY

Land Economics/Use, Resource /Energy Economics and Policy,

The Frequency of Fire in East Texas Forests

The debate over the use of fire by Native Americans has been a lively one for many years. Did they or did they not set fires? If they did, how frequently and for what purpose? If not, did they take advantage of naturally occurring fires for the same purposes? If so, how frequently and to what intensity did those natural fires occur? These seem like relatively simple questions that should elicit focused, directed research that would, in tum, produce straightforward answers. In some parts of North America, this has indeed been the case. Ethnographic documentation, corroborated by archaeological research, has produced unequivocal evidence that the first Americans used fire extensively to manipulate the environment in which they lived. This article examines early historic accounts of Native American use of fire in Texas, and the frequency of natural fires. These data are important not only to our understanding of the extent to which humans altered the landscape, but also how plant communities adapted to fires. Often, we interpret paleoenvironmental data to reflect climatic changes. However, we must also understand the factors that may have contributed to these changes in pollen sequences and soil formation processes