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Den boreala skogen, mer känd som taigan, breder ut sig på de nordliga delarna av norra halvklotet innan den trädlösa tundran tar över. I detta enorma skogsområde som sträcker sig genom Skandinavien, Ryssland och Nordamerika är störningar i form av bränder, insektsangrepp och stormar vanliga och en naturlig del av ekosystemet. Dessa störningar påverkar skogens kolbalans genom deras inverkan på bådeNatural disturbances such as fires, insect outbreaks and windthrows are able to influence the balance between the ecosystem gain and loss of carbon in the boreal forest. This effect of natural disturbances on the ecosystem carbon balance has been proposed as one of the reasons why the CO2 concentration in the atmosphere varies between years. At present the boreal forest as a whole act to mitigate

In liquid-liquid chromatography (LLC), components of a mixture are separated due to their different distribution between the phases of a biphasic liquid system composed of two or more solvents. In this work, for the first time, we combine a chromatography model with a liquid-liquid equilibria thermodynamic model to simulate the propagation of the solute and the solvents along the LLC column. The m

In this research, a straightforward and effective preconcentration technique was developed by integrating three-phase hollow fiber liquid-phase microextraction (HF-LPME) with high-performance liquid chromatography equipped with a photodiode array detector and mass spectrometry (HPLC-DAD/MS) for the simultaneous extraction and quantification of trace levels of tamoxifen (Tam) and clomiphene (Clom)

This study investigates the surface transformations of nickel foam (NF) electrodes induced by Fe and Co cation incorporation from the electrolyte following activation in the oxygen evolution reaction (OER), using both ex situ time-of-flight secondary ion mass spectrometry (TOF-SIMS) and in situ near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS). Electrochemical measurements demonstra

Coherent multidimensional spectroscopy (CMDS) is the most complete nonlinear optical technique based on the interaction of multiple short laser pulses with matter. It has grown to play a significant role in studies of optoelectronic materials and pigment protein complexes. In this work we apply CMDS to investigate electronic excitations and their dynamics in semiconductor nanocrystals, so called q

Convolutional neural networks (CNNs) have gained popularity in recent years due to their ability to solve complex problems in areas such as image recognition, natural language processing, and speech recognition. However, the computational cost and memory requirements of CNNs are significant challenges for their widespread deployment, particularly in edge devices where power and area budgets are li

Risk and safety in fieldwork and excursions 28 May 2020 Sida 1 av 5 Risk and safety assessment for fieldwork and excursions The employer/coordinator of the fieldwork has to make a risk assessment for every fieldwork in accordance with the law of Systematic Work Environment Management (In Swedish “SAM”), and it has to be documented. This document applies mainly to fieldworkers at CEC and to fieldwo

https://www.cec.lu.se/sites/cec.lu.se/files/risk_and_safety_during_fieldwork_and_excursions_cec.pdf - 2026-07-02

Background: A woman's dissatisfaction with the experience of labor and birth may affect her emotional well-being and willingness to have another baby. The aim of this study was to investigate the prevalence and risk factors of a negative birth experience in a national sample. Methods: A longitudinal cohort study of 2541 women recruited from all antenatal clinics in Sweden during 3 weeks spread ove

The development of good writing skills is fundamental not only to publish scientific results, but also to have a deeper understanding of complex subjects. However reports from the Swedish Higher Education Authority from 2012-2015 suggest that engineering students at Lund University have unsatisfactory academic writing skills. Our paper investigates how students of the Faculty of Engineering at Lun

Monte Carlo event generators are used by theoretical particle physicists to get a better understanding of the phenomena in particle physics. Given the improvements in precision and accuracy of event generators, using these tools can be very CPU intensive. A method of unweighting events using artificial neural networks is presented to improve the efficiency of event generation. An introduction to m

Correct time and frequency synchronization is important for the performance of orthogonal frequency division multiplex (OFDM) systems. We evaluate a system where a pseudonoise sequence (PN-sequence) is used for estimation of these synchronization parameters. The PN-sequence is superimposed on the OFDM signal. The system is evaluated by means of the variance of the frequency estimation error and th

Combustion and emissions formation in a Volvo TD 100 series diesel engine running in a homogeneous charge compression ignition (HCCI) mode and fuelled with natural gas is simulated and compared with measurements for both with and without external exhaust gas recirculation (EGR). A new stochastic approach is introduced to model the convective heat transfer, which accounts for fluctuations and fluid

The performance of six custom-built Hygrocopicity-Tandem Differential Mobility Analyser (H-TDMA) systems was investigated in the frame of an international calibration and intercomparison workshop held in Leipzig, February 2006. The goal of the workshop was to harmonise H-TDMA measurements and develop recommendations for atmospheric measurements and their data evaluation. The H-TDMA systems were co

An injury to the axillary nerve from a shoulder trauma can easily be overlooked. Spontaneous functional recovery may occur, but occasionally reconstructive surgery is required. The time frame for nerve reconstruction procedures is from a neurobiological view crucial for a good functional outcome. This study presents a group of operatively and non-operatively treated young adults with axillary nerv

Cluttering is a fundamental problem in 3D city model visualization. In this paper, a novel method for removing cluttering by typification of linear building groups is proposed. This method works. in static as well as dynamic visualization of 3D city models. The method starts by converting building models in higher Levels of Details (LoDs) into LoD1 with ground plan and height. Then the Minimum Spa

On January 1st, 2006, the Swedish legislation on obtaining DNA reference samples from Suspects and the recording of DNA profiles in databases was changed. As a result the number of samples analysed at the Swedish National Laboratory of Forensic Science (SKL) increased from about 4500 in 2005 to more than 25,000 in 2006. To meet this challenge, SKL launched a flew analysis system to create an unbro