729 research outputs found
Correction: A low cost azomethine-based hole transporting material for perovskite photovoltaics
No abstract available
Solar cell
A solar cell comprising a semiconductor layer (1), a collecting layer (6) for collecting free charge carriers from the semiconductor layer (1) and a buffer layer (3) which is arranged between the semiconductor layer (1) and the collecting layer (6), which buffer layer (3) is designed as a tunnel contact (31) between the semiconductor layer (1) and the collecting layer (6) is characterised in that the buffer layer (3) essentially comprises a material with a surface charge density of at least 1012 cm-2, preferably of at least 5x1012 cm- 2
The determination of two emerging perfluoroalkyl substances and related halogenated sulfonic acids and their significance for the drinking water supply chain
The determination of two emerging perfluoroalkyl substances and related halogenated sulfonic acids and their significance for the drinking water supply chain
Multiple Labeling in Electron Microscopy: Its Application in Cardiovascular Research
The heart is a muscular pump kept together by a network of extracellular matrix components. An increase in collagens, as in chronic congestive heart failure (CHF), is thought to have a negative effect on cardiac compliance and, thus, on the clinical condition. Conventional electron microscopy allows for the study of cellular and extracellular components and scanning electron microscopy (SEM) can put these structures in three-dimensional perspective. However, in order to study extracellular matrix components in relation to cells, immunoelectron microscopy is superior. We have used this technique in our studies on heart failure. Heart specimens were fixed in 4% paraformaldehyde and 0.1% glutaraldehyde in sodium cacodylate buffer, dehydrated by the method of progressive lowering of temperature and embedded in LR Gold plastic. Immunolabeling could be achieved with different sized gold-conjugated secondary antibodies or protein-A gold conjugates. Depending on the objective, ultra small gold (USG) conjugates or a regular probe size can be used. Labeling efficiency could be increased by bridging antibodies. The double and triple staining procedures were based on single staining methods using one-and two-face labeling. The choice of antibodies and gold conjugates depended on the objectives. Immunoelectron microscopy, using multiple labeling, allowed a detailed study of the organization of the extracellular matrix and its relationship with cardiac myocytes. This may prove to be a useful tool for the study of chronic heart failure
Trichodorideaaltjes en bodemschimmels lijken veroorzakers onbekend wortelrot
Onderzoek van PPO en BAB naar de mogelijke oorzaken en maatregelen om problemen met onbekend wortelrot in leli
Frozen water waves over rough topographical bottoms
The propagation of surface water waves over rough topographical bottoms is
investigated by the multiple scattering theory. It is shown that the waves can
be localized spatially through the process of multiple scattering and wave
interference, a peculiar wave phenomenon which has been previously discussed
for frozen light in optical systems (S. John, Nature {\bf 390}, 661, (1997)).
We demonstrate that when frozen, the transmission of the waves falls off
exponentially, and a cooperative behavior appears, fully supporting previous
predictions. A phase diagram method is used to illustrate this distinct phase
states in the wave propagation.Comment: 4 pages and 5 figure
Gravity waves over topographical bottoms: Comparison with the experiment
In this paper, the propagation of water surface waves over one-dimensional
periodic and random bottoms is investigated by the transfer matrix method. For
the periodic bottoms, the band structure is calculated, and the results are
compared to the transmission results. When the bottoms are randomized, the
Anderson localization phenomenon is observed. The theory has been applied to an
existing experiment (Belzons, et al., J. Fluid Mech. {\bf 186}, 530 (1988)). In
general, the results are compared favorably with the experimental observation.Comment: 15 pages, 7 figure
Naar een oplossing voor onbekend wortelrot in lelie : praktijkproef
In lelies komt er al jaren een vorm van wortelrot voor waarvan de veroorzaker onbekend is. Net als bij een aantasting door wortellesie-aaltjes leidt een aantasting door het onbekende wortelrot tot opbrengstderving en kwaliteitsverlies. De symptomen van onbekend wortelrot ontstaan op de bolwortels en zien eruit als insnoeringen en ingezonken bruine plekjes. Soms lijkt het alsof er hapjes uit de wortels zijn genomen. De wortels rotten op dergelijke plaatsen geheel door waarna bruine wortelpunten ontstaan en de wortels zich sterk gaan vertakken. In dit project werd onderzocht of grondstructuur (verdichting) en het gebruik van GFT al dan niet in combinatie met grondgebonden pathogene schimmels een rol spelen in het optreden van onbekend wortelrot in lelie. Ook werd onderzocht of het vochtig of juist droog houden van de grond na planten van invloed is op de mate van onbekend wortelrot. Ten slotte werd de werking van de middelen Amistar en Monam tegen onbekend wortelrot onderzocht. In dit onderzoek werd 15 l/ha Amistar gebruikt i.p.v. de 6 l/ha die is toegestaan, terwijl voor Monam de gebruikelijke concentratie van 500 l/ha werd toegepast. Het onderzoek werd uitgevoerd op een praktijkperceel waar in 2007 lelies werden geteeld waarin volop onbekend wortelrot was waargenomen. Onder praktijkomstandigheden werd onderzocht of combinaties van genoemde factoren mogelijk een rol spelen bij het ontstaan van onbekend wortelrot
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