98 research outputs found
General theory for spontaneous emission in active dielectric microstructures: Example of a fiber amplifier
Quantum electrodynamical theory and modeling of light emission in vertical cavity devices
Control of helminth diseases on daily cattle farms in flanders: Results of a questionnaire survey.
Comparative studies of ivermectin and moxidectin in the control of naturally acquired cyathostome infections in horses
The control of naturally acquired cyathostome infections in horses by treatments with ivermectin and moxidectin was evaluated in three field studies. In a first study the efficacy of both drugs was assessed in a faecal egg count reduction test. Both ivermectin and moxidectin demonstrated efficacies greater than 99 per cent for up to 60 days after treatment, In a second study, the period required for strongyle eggs to reappear was estimated in horses treated either with ivermectin or moxidectin. For the horses treated with ivermectin the period varied between 10 and approximately 13 weeks, and for moxidectin between 22 and approximately 24 weeks. With both drugs strongyle eggs started to reappear in the faeces significantly earlier in foals and young horses than in adults. In a third study, two prophylactic dosing schemes involving three ivermectin treatments at intervals of eight weeks, and two moxidectin treatments 12 weeks apart, were found to be highly effective in controlling strongyle infections of horses on pasture
A bioassay for estimation of inhibitory effects of bovine serum on nematode larval migration
Comperative studies of ivermectin and moxidectin in the control of naturally acquired cyathosome infections in horses
The use of bovine serum in a larval miration inhibition test to evaluate the development of immunity to Ostertagia ostertagi
Confinement factors and gain in optical amplifiers.
A new identity is derived which relates the gain and the field distribution (or confinement factor) in a dielectric waveguide with complex refractive indices. This identity is valid for any guided mode of waveguides with an arbitrary cross section. It provides a new check of the accuracy of mode solvers. Also, it can be used in a variational approach to predict the gain or loss of a guided mode based on knowledge of confinement factors. It is shown that a previous analysis that is often used, is not correct. In addition, approximate expressions for the gain in slab waveguides are presented
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