1,722,934 research outputs found
A.e. convergence of anisotropic partial Fourier integrals on Euclidean spaces and Heisenberg groups
No full textLand use dynamics in the central highlands of Vietnam: a spatial model combining village survey data with satellite imagery interpretation
No full textThe paper investigates geo-physical, agro-ecological, and socio-economic determinants of past land use change in two districts of Dak Lak province in the Central Highlands of Vietnam and assesses the influence of rural development policies on land cover change. Landsat satellite images from the years 1975, 1992 and 2000 are interpreted to detect land cover in two time periods. A survey in randomly selected villages provides primary recall data on socio-economic and policy variables hypothesised to influence land use change. Secondary data on rainfall, soil suitability, and topography was obtained from meteorological stations and from a digital soil map and digital elevation model. All data were spatially referenced using geographic information systems (GIS) software. A reduced-form, multinomial logit model is used to estimate the influence of hypothesised determinants on land use and the probabilities that a certain pixel has one of five land classes during either of the two periods. Results suggest that the first period from 1975 to 1992 was characterised by land-intensive agricultural expansion and the conversion of forest into grass and agricultural land. During the second period, since 1992, the rapid, more labour- and capital-intensive growth in the agricultural sector was enabled by the introduction of fertiliser, improved access to rural roads and markets, and expansion of the irrigated area. These policies, combined with the introduction of protected forest areas and policies discouraging shifting cultivation during the second period reduced the pressure on forests while at the same time increasing agricultural productivity and incomes for a growing population. Forest cover during the second period mainly increased due to the regeneration of areas formerly used for shifting cultivation. (C) 2002 Elsevier Science B.V. All rights reserved
Traditional and new drugs of abuse - management of acute emergency cases
No full textEmergency incidences caused by drugs of abuse are frequent events. The majority of cases treated by medical services in Germany are ethanol poisonings, whereas severe methanol poisoning is rare. Many analgesics can cause an opioid toxidrome characterised by sedation and high risk for respiratory depression, while overdosing of gamma-hydroxybutyrate or benzodiazepines cause sedation, but rarely lead to respiratory failure. Cocaine, amphetamines, and the withdrawal of alcohol or opioids stimulate the central and the peripheral nervous system. Treatment of acute drug poisonings is symptomatic in most cases. Excitation states and generalised seizures are even treated with high doses of a benzodiazepine. Specifically acting antidotes are available for methanol poisoning (fomepizole), opioid poisoning (naloxone) and benzodiazepine overdose (flumazenil). However, treatment with naloxone or flumazenil may induce severe withdrawal symptoms in patients adapted to the drug
Solvability of second-order left-invariant differential operators on the Heisenberg group satisfying a cone condition
No full textUse of carbon monoxide detectors by emergency medical services. Comments and recommendations for operation and definition of threshold values
No full textDue to the increasing occurrence of carbon monoxide (CO) poisoning and increasing public awareness, many emergency services have acquired devices to warn emergency staff. The use of CO warning devices requires threshold values that protect emergency staff and also permit life-saving measures of short duration as well as an early initiation of therapy. Quantitative assessment of CO-associated hazards on the basis of an empiric exposure model and comparison with toxicological data, occupational health limit-values and emergency plans according to recommendations of international associations. Recommendations for the protection of patients as well as emergency medical staff and for setting of warning threshold values are presented. Warning devices with multiple warning limits provide the maximum possible room to maneuver in emergency situations with sufficient protection of emergency staff. The use of CO detectors in accordance with the described recommendations allows the detection of unrecognized CO poisoning and risk-adjusted warning against acute danger at the emergency location
Traditional and new drugs of abuse - management of acute emergency cases
No full textEmergency incidences caused by drugs of abuse are frequent events. The majority of cases treated by medical services in Germany are ethanol poisonings, whereas severe methanol poisoning is rare. Many analgesics can cause an opioid toxidrome characterised by sedation and high risk for respiratory depression, while overdosing of gamma-hydroxybutyrate or benzodiazepines cause sedation, but rarely lead to respiratory failure. Cocaine, amphetamines, and the withdrawal of alcohol or opioids stimulate the central and the peripheral nervous system. Treatment of acute drug poisonings is symptomatic in most cases. Excitation states and generalised seizures are even treated with high doses of a benzodiazepine. Specifically acting antidotes are available for methanol poisoning (fomepizole), opioid poisoning (naloxone) and benzodiazepine overdose (flumazenil). However, treatment with naloxone or flumazenil may induce severe withdrawal symptoms in patients adapted to the drug
Severe Lung Injury after Intravenous Injection of Firelighter Liquid in an Attempted Suicide
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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