Sökresultat

Biometric signatures based on either the physiological or behavioural features of a person have been widely used for identification and authentication. However, few strategies have been developed that combine the two types of features in one signature. Here, we report a type of biometric signature based on the triboelectricity of the human body (TEHB) that combines these two types of features. Thi

In most cases, direct X-ray fluorescence (XRF) analysis of solutions entails technical difficulties due to a high X-ray scattering background resulting in a spectrum with a poor signal-to-noise ratio (SNR). Key factors that determine the sensitivity of the method are the energy resolution of the detector and the amount of scattered radiation in the energy range of interest. Limiting the width of t

In this study, we discuss Swedish travelers from different backgrounds during their visits to Greece and Asia Minor in the 18th century. Besides their scientific interests, they write about their impressions of the Greeks and other people in the area, as well as education, language, religion, local economy, culture, and social life. They have good knowledge of ancient Greek history and the Greek l

Due to the availability of X-ray imaging detectors, full-field X-ray fluorescence (FF-XRF) imaging technique has become achievable, which provides an alternative to scanning X-ray fluorescence imaging with a micro-focus X-ray beamline. In this paper, we present a setup based on straight capillary optics and an energy-dispersive hybrid pixel detector, which can perform simultaneous mapping of sever

Den alltjämt pågående övergången från analoga, mekaniska format och apparater till en nära nog allomfattande digital teknologi utmärks av långtgående och omfattande förändringar. Föga förvånande benämns omvandlingsprocessen återkommande som den tredje industriella revolutionen. Sedan det sena 1990-talet har digital teknik även kommit att alltmer prägla film- och tv-inspelningar, men de nya möjligh

Ingegerd Christiansson har gått i pension och med denna skrift vill vi visa vår uppskattning för hennes fina insatser vid Historiska institutionen. Ingegerd har verkat som administratör under flera decennier. Som lokalt skyddsombud vid institutionen och centralt huvudskyddsombud vid Humanistiska och teologiska fakulteterna har hon dessutom gjort mycket viktiga insatser för arbetsmiljöarbetet. I de

Om bygdespels historia och Ingegerd Christiansson som lokalhistorisk pjäsförfattare.

A large amount of contaminated cellulose and wood fibers were emitted directly onto the seabed by the pulp and paper industry before the year of 1970. This fiber-rich sediment contains concentrations of hazardous substances that cause environmental problems. Mercury (Hg) in the fiber sediment is a worldwide threat because it can bioaccumulate in the aquatic ecosystem and eventually affect human he

With the rapid expansion of the waste incineration business both in Europe and globally, there is a growing need for the elemental analysis for fly ash from municipal solid waste incineration. In this work, samples of washed and unwashed ash from municipal solid waste incineration in Sundsvall are evaluated. Qualitative analysis and semi-quantitative analysis are used to compare two elemental anal

Elemental mapping images can be achieved through step scanning imaging using pinhole optics or micro pore optics (MPO), or alternatively by full-field X-ray fluorescence imaging (FF-XRF). X-ray optics for FF-XRF can be manufactured with different micro-channel geometries such as square, hexagonal or circular channels. Each optic geometry creates different imaging artefacts. Square-channel MPOs gen

In the pulp and paper industry, about 5 Mt/y chemithermomechanical pulp (CTMP) are produced globally from softwood chips for production of carton board grades. For tailor making CTMP for this purpose, wood chips are impregnated with aqueous sodium sulphite for sulphonation of the wood lignin. When lignin is sulphonated, the defibration of wood into pulp becomes more selective, resulting in enhance

Paperpresentation. Textbegreppets problematik, DuRietz textbegrepp.