检索结果-南通市图书馆

Particle size and packing characterization by diffuse light transmission

在线全文

学校读者我要写书评

暂无评论

Particuology 2012年第5期10卷 619-627页

作者： henrik Ehlers Jyrki Heinmki Jouko Yliruusi Division of Pharmaceutical Technology Faculty of Pharmacy P.O. Box 56 (Viikinkaari 5 E) FI-00014 University of Helsinki Finland Pharmaceutical Sciences Laboratory Department of Biosciences bo Akademi University BioCity Artillerigatan 6 20520 Turku Finland Department of Pharmacy Faculty of Medicine University of Tartu Nooruse 1 50411 Tartu Estonia

Particle size, packing density and blend composition of glass ballotini, microcrystalline cellulose pellets and theophylline granules were studied by diffuse light transmission. Diffuse visible light was directed to the sample and the intensity of the light transmitted to the opposite side of the sample was measured through a diffusing lens using a phototransistor, Light transmission was found to decrease with decreasing particle size and with increasing packing density, There was a correlation, though somewhat irregular, between light transmission and particle size for glass ballotini and microcrystalline cellulose pellets, and a strong near-linear correlation between light transmission and particle size for theophylline granules, The effect of packing density on light transmission was significant, Differentiating the composition of binary blends of microcrystalline cellulose pellets and glass ballotini and blends of theophylline granules was found possible on the basis of light transmission, The method proposed showed potential as a rapid, simple and inexpensive analytical tool for basic process diagnostics,

关键词： Light transmissionParticle sizePacking densityConvectionSegregation

Infrared spectroscopic probing of dimethylamine clusters in an Ar matrix

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2016年第2期28卷 51-59页

作者： Siyang Li henrik G.Kjaergaard Lin Du Environment Research Institute Shandong University Shanda South Road 27 Shandong 250100 China Department of Chemistry University of Copenhagen Universitetsparken 5 DK-2100 Copenhagen φ Denmark

Amines have many atmospheric sources and their clusters play an important role in aerosol nucleation processes. Clusters of a typical amine, dimethylamine（DMA）, of different sizes were measured with matrix isolation IR（infrared） and NIR（near infrared）spectroscopy. The NIR vibrations are more separated and therefore it is easier to distinguish different sizes of clusters in this region. The DMA clusters, up to DMA tetramer, have been optimized using density functional methods, and the geometries, binding energies and thermodynamic properties of DMA clusters were obtained. The computed frequencies and intensities of NH-stretching vibrations in the DMA clusters were used to interpret the experimental spectra. We have identified the fundamental transitions of the bonded NH-stretching vibration and the first overtone transitions of the bonded and free NH-stretching vibration in the DMA clusters. Based on the changes in vibrational intensities during the annealing processes, the growth of clusters was clearly observed. The results of annealing processes indicate that DMA molecules tend to form larger clusters with lower energies under matrix temperatures, which is also supported by the calculated reaction energies of cluster formation.

关键词： Matrix isolation Infrared(IR) spectroscopy Dimethylamine clusters Aerosol nucleation

Nuclear Phytochrome B Regulates Leaf Flattening through Phytochrome Interacting Factors

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2014年第11期7卷 1693-1696页

作者： henrik Johansson Jon Hughes Department of Plant Physiology Justus Liebig University D35390 Giessen Germany

Dear Editor, Plants are equipped with an array of photorecep- tors to measure UV-B, blue, red, and far-red light in order to monitor their light environment. However, although both synergistic and antagonistic interactions have been described between blue and red light signals （Casal, 2000）, little is known about how different light signals are inte- grated into modulate plant growth and development.

关键词： ARABIDOPSIS PHOTOTROPIN AUXIN PIF4 LIGHT

The challenge of combining variable retention and prescribed burning in Finland

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecological Processes 2020年第1期9卷 46-57页

作者： henrik Lindberg Pekka Punttila Ilkka Vanha-Majamaa Häme University of Applied Sciences Visamäentie 35 A Box 230FI-13101 HämeenlinnaFinland Finnish Environment Institute Latokartanonkaari 11FI-00790 HelsinkiFinland Natural Resources Institute Finland(Luke) Latokartanonkaari 9FI-00790 HelsinkiFinland

Historically,wildfires have played an important role in forest dynamics in *** Finland,the annually burned area has diminished in recent *** has led to a decline of fire-adapted habitat types and species,many of which have become *** Fennoscandia,there is a long tradition of silvicultural burnings to enhance tree ***,prescribed burnings have been modified for biodiversity goals following the recommendations that have emerged from ecological *** biodiversity gains can be obtained by combining sufficient retention levels with ***,burning and retention have been recommended by recent national red-list assessments,strategies,and forest-management guidelines,and they have been adopted in forest-certification standards in *** to these recommendations,the opposite development has taken place:(1)the ecological efficiency of the criterion concerning prescribed burning in the PEFC forestcertification standard has been impaired,(2)state funding to encourage private forest owners to apply prescribed burning was reduced significantly,and(3)prescribed burnings have been abandoned altogether in commercial state-owned *** burnings with variable retention have also been partially replaced with burning of small retention-tree *** new method is less risky and cheaper,but its ecological benefits are questionable because small-sized fires produce much smaller areas of burned forest soil with less fire-affected wood than traditional silvicultural ***,the widely accepted goal to increase burnings with retention appears difficult to achieve and would require stronger political will and economic support from the *** identified several actions that could improve the weakened situation of fire-dependent biodiversity and recommend the following:(1)setting a clear goal and ensuring sufficient funding for the burnings—including restoration burnings in co

关键词： Biodiversity Conservation areas Fire-dependent species Forest certification Red-listed species Restoration burnings

How Can We Make Disaster Management Evaluations More Useful?An Empirical Study of Dutch Exercise Evaluations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2020年第5期11卷 578-591页

作者： Ralf Josef Johanna Beerens henrik Tehler Ben Pelzer Institute for Safety(IFV) 6801 HA ArnhemThe Netherlands Division of Risk Management and Societal Safety Lund University22100 LundSweden Lund University Centre for Risk Assessment and Management(LUCRAM) Lund University22100 LundSweden Department of Sociology Radboud University Nijmegen6500 HE Nijmegen.The Netherlands

The evaluation of simulated disasters(for example,exercises)and real responses are important ***,little attention has been paid to how reports documenting such events should be written.A key issue is how to make them as useful as possible to professionals working in disaster risk ***,we focus on three aspects of a written evaluation:how the object of the evaluation is described,how the analysis is described,and how the conclusions are *** empirical experiment,based on real evaluation documents,asked 84 Dutch mayors and crisis management professionals to evaluate the perceived usefulness of the three aspects noted *** results showed that how evalua・tions are written does ***,the usefulness of an evaluation intended for learning purposes is improved when its analysis and conclusions are *** contrast,evaluations used for accountability purposes are only improved by the clarity of the con *** findings have implications for the way disaster management evaluations should be documented.

关键词： Disaster management evaluation Evaluation design Evaluation report Exercise evaluation The Netherlands Usefulness

Advancing the Field of Disaster Response Management:Toward a Design Science Approach

在线全文

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2021年第2期12卷 220-231页

作者： Tove Frykmer henrik Tehler Christian Uhr Misse Wester Division of Risk Management and Societal Safety Lund University22100LundSweden Lund University Centre for Risk Assessment and Management(LUCRAM) 22100LundSweden

Multiorganizational response to emergencies and disasters requires *** to improve the collective response is therefore an essential question,but not easy to *** disaster research,normative research with a focus on providing evidence for how to improve professional practice has traditionally received less attention than explanatory *** aim of this article,using insights from design science where normative research is more common,is to suggest a complementary approach to response management *** approach,which combines experimental and explanatory research,is applied to a study of goal *** alignment among response actors is often recommended despite literature’s contradictory evidence regarding its *** conducted an experiment with 111 participants,who,in groups of three,played a computer game under one of two conditions(goal alignment or not).Our results show that aligning goals did not improve the outcome in the *** this may serve as a counterargument to implementing goal alignment interventions,there are concerns with such *** reservations include,but are not limited to,the lack of validated models to use in ***,our suggested research approach and the goal alignment experiment highlight the importance of testing interventions and their effectiveness before implementation.

关键词： Design science Disaster response management Experimental research Goal alignment

An LSTM‐based approach to precise landing of a UAV on a moving platform

在线全文

学校读者我要写书评

暂无评论

International Journal of Mechanical System Dynamics 2022年第1期2卷 99-107页

作者： Wei Luo henrik Ebel Peter Eberhard Institute of Engineering and Computational Mechanics University of StuttgartStuttgartGermany

A machine learning‐based method for the precise landing of an unmanned aerial vehicle on a moving mobile platform is *** proposed approach attempts to predict the mobile platform's future trajectory based on the past states of the mobile *** that end,it combines a long short‐term memory‐based neural network with a Kalman ***,it aims at combining the advantages of a machine learning method with those of a state estimation method from established control *** on the predicted trajectory,the unmanned aerial vehicle attempts to land precisely on the moving mobile *** experiment is conducted in the Gazebo simulation platform with a quadrotor and an omni-directional mobile robot,and the proposed method is compared with the single‐method approaches of using only either the Kalman filter or the machine learning method alone.

关键词： Kalman filter long short‐term memory(LSTM) trajectory prediction unmanned aerial vehicle(UAV)

Whole-brain three-dimensional imaging for quantification of drug targets and treatment effects in mouse models of neurodegenerative diseases

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2020年第12期15卷 2255-2257页

作者： henrik HHansen Urmas Roostalu Jacob Hecksher-Sorensen Gubra HprsholmDenmark

Quantitative histopathology in preclinical neuroscience:Altered brain functionality in neurodegenerative diseases,including Parkinson’s disease(PD)and Alzheimer’s disease(AD),involve complex pathological changes and molecular mechanisms which poses a major challenge for development of effective drug *** loss of specific neuron types and projections are hallmarks of PD and AD and proper histological evaluation of relevant disease models therefore requires highly reliable cell detection.

关键词： drug treatment Alzheimer

Incorporating Optimal Operation Strategies into Investment Planning for Wind/Electrolyser System

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2022年第2期8卷 347-359页

作者： Yi Zheng Shi You henrik W.Bindner Marie Munster the Department of Electrical Engineering Technical University of Denmark2800 Kgs.LyngbyDenmark the Department of Technology Management and EconomicsTechnical University of Denmark2800 Kgs.LyngbyDenmark

As a conducive and prevalent technique for producing green hydrogen,hybrid wind-based electrolyzer system requires both effective planning and operation to realize its techno-economic *** of the existing studies are focused on either of these two,but none of them sufficiently emphasize on their *** this paper,we propose a two-stage multi-objective optimization framework to reveal optimal investment plans considering various operational strategies,such as economic revenue maximization and green hydrogen production *** results reveal that:1)A trade-off exists between system investment and the capacity to accomplish optimal operational *** example,the system demands flexibility to boost operational profits,but this results in high investment costs.2)Differentiated operation objectives generate different component capacities during the planning phase.3)Regarding a wind-hydrogen system with gas storage,the Pareto optimal design manifesting the trade-off between system investment and prime operational performance can be actualized along the margins of a feasible solution.

关键词： Hybrid wind-hydrogen system multi-objective optimization optimal operation planning sizing