Search Results

You are looking at 61 - 70 of 1,261 items for :

Clear All
Open access

H.P. Harke and C.J. Drews

Abstract

The present paper describes a simple device designed for the analytical smoking of single cigarettes and capable of collecting the gaseous constituents of tobacco smoke. The trap has been used to determine the carbon monoxide content of the smoke of cigarettes made from reconstituted tobacco by gas chromatography

Open access

Romi Shamoyan and Seraphim Maksakov

Abstract

The survey collects many recent advances on area Nevanlinna type classes and related spaces of analytic functions in the unit disk concern- ing zero sets and factorization representations of these classes and discusses approaches, used in proofs of these results.

Open access

János Folláth

Abstract

Modern lattice-based cryptosystems require sampling from discrete Gaussian distributions. We review lattice based schemes and collect their requirements for sampling from discrete Gaussians. Then we survey the algorithms implementing such sampling and assess their practical performance. Finally we draw some conclusions regarding the best candidates for implementation on different platforms in the typical parameter range

Open access

Jiří Hájek and Josef Jelínek

Abstract

The cryptic slime-mold beetle Sphindus cf. rendilianus Lesne, 1922, described originally from Kenya, and so far known only from the holotype, is recorded from Socotra Island based on five specimens from recent collecting efforts. This is the first report of the family Sphindidae from the archipelago.

Open access

Rastislav Telgarsky

Abstract

Observation of nature and design of experiments inspires new mathematical investigations often resulting in new computer algorithms and constructions of new devices. This paper attempts to collect many cases where mathematics is inspired by the nature, and leads to direct applications in engineering.

Open access

The ›Head of Household‹

A Long Normative History of a Statistical Category in the U.K

Kerstin Brückweh

The household forms an important category in social science research. It is used to collect data, to classify it and to represent the results. In 2009, for example, 3.48 % of U.K. households were classified as the most influential and wealthiest individuals in the U.K.; at the other end 5.16 % of U.K. households formed the most disadvantaged people. While the households in the first group represented positions of power in the private and public sector and could afford luxury items, the latter had a budget to only cope with the daily necessities. Experian

Open access

Alexandra Ostmann, Sarah Schnurr and Pedro Martínez Arbizu

Abstract

Sediment samples and hydrographic conditions were studied at 28 stations around Iceland. At these sites, Conductivity-Temperature-Depth (CTD) casts were coducted to collect hydrographic data and multicorer casts were conducted to collect data on sediment characteristics including grain size distribution, carbon and nitrogen concentration, and chloroplastic pigment concentration. A total of 14 environmental predictors were used to model sediment characteristics around Iceland on regional scale. Two approaches were used: Multivariate Adaptation Regression Splines (MARS) and randomForest regression models. RandomForest outperformed MARS in predicting grain size distribution. MARS models had a greater tendency to over-and underpredict sediment values in areas outside the environmental envelope defined by the training dataset. We provide first GIS layers on sediment characteristics around Iceland, that can be used as predictors in future models. Although models performed well, more samples, especially from the shelf areas, will be needed to improve the models in future.

Open access

Krzysztof Treder, Włodzimierz Przewodowski and Agnieszka Barnyk

Factors influencing detection of Potato Leafroll Virus and Potato Virus Y in potato tuber extracts

Detection of Potato leafroll virus (PLRV) and Potato virus Y (PVY) directly in potato tubers has been influenced by several factors. The most important were: the place of tuber sampling, preincubation of tuber sap before loading into wells of microplate and duration of tubers storage after collecting from field. The concentration of both viruses was highest in the heel part of tubers, whenever tested. Preincubation of tuber sap for several hours improved true/false signal ratio for dormant tubers and enabled reliable detection of both viruses. However after natural dormancy breaking it was necessary to change Cocktail-ELISA procedure to obtain reliable results, consistent with DAS-ELISA on leaves. The sap was not preincubated but loaded into wells directly after sample collecting and immuno-enzymatic reaction was developed overnight in refrigerator.

Open access

Jerzy Puchalski, Maciej Niemczyk, Piotr Walerowski, Wiesław Podyma and Adam Kapler

Abstract

Among the 2750 species of the Polish vascular flora, about 500 species are threatened with extinction and 430 of them are strictly protected by national law. The FlorNatur project for the ex situ conservation of the most endangered species was started in 2009. The aim of the project is to collect seeds of 61 species from 161 sites in eastern Poland and store them in the Seed Bank of the Polish Academy of Sciences Botanical Garden - Center for Biological Diversity Conservation in Warsaw- Powsin. A complementary program is being carried out by the Forestry Gene Bank at Kostrzyca in western Poland. Their task is to collect 58 species from 129 natural sites in the western part of Poland. To date, seeds of 31 species from 56 populations have been collected, tested and stored in liquid nitrogen.

Open access

Steven Pedlow

Abstract

This article describes a case study on the potential of using smaller geographical units in an area probability design, and reports the challenges of collecting a nationally representative sample for this hard-to-reach population. The Census Integrated Communications Program Evaluation (CICPE) was designed to evaluate the promotional campaign’s effect on Decennial Census participation for six race/ethnicity groups of interest. A nationally representative Core sample was designed to collect interviews for Hispanics, non-Hispanic African-Americans, and non- Hispanic Whites. However, it was impractical to include the rarer Asian, American Indian and Alaska Native (AIAN), and Native Hawaiian and Other Pacific Islander (NHOPI) populations in the Core design. For the Asian sample, we designed a separate area probability sample.

Traditional area probability sampling designs use counties or metropolitan areas as first-stage units, but smaller geographical units can better target hard-to-reach populations. The CICPE Asian sample used cities as the first-stage units.