665 research outputs found
Regional micronutrient supply in Hungary on the example of Fejer county
No full textThe author gives information about regional micronutrient supply in Hungary on the example of Fejer county. The general information of the couny, the physical and chemical characteristics of the soils are shown. The Cu-, Zn-, and Mn-supply of the soils, the plant analysis results and the micronutrients balance-sheets are also discussed
Does postural sway change in association with manual therapeutic interventions? A review of the literature
No full textStudy design
Literature Review
Objectives
The objective of this literature review was to determine if postural sway changes in association with manual therapeutic interventions and to investigate whether any changes occur in healthy individuals or in association with pain intensity.
Summary of Background data
Improving postural stability has been proposed as a goal of manual therapeutic interventions. So far, no literature review has addressed whether there is supportive evidence for this and if so, what factors may be associated or causative for observed sway alterations.
Search methods
Seven online databases (PubMed, MEDLINE, EMBASE, CINAHL, Web of Science, ScienceDirect and the Cochrane library) were systematically searched followed by a manual search of the retrieved papers.
Selection criteria
Studies comparing postural sway derived from bipedal force plate measurements in association with a manual therapeutic intervention, ideally compared to a control group.
Data collection and analysis
Two reviewers independently screened titles and abstracts for relevance, conducted the data extraction and the risk of bias assessment which was conducted using the RTI item bank. A descriptive analysis was conducted as the heterogeneous study designs prevented pooling of data.
Results
Nine studies of varying methodological quality met the inclusion criteria. No direct comparison of data across the studies was possible. There was no evidence that manual interventions lead to a change in postural sway in healthy individuals regardless of the body regions addressed by the intervention. There was some indication that postural sway may change at follow-up measurements in pain sufferers; however, this may be due to variations in pain intensity rather than resulting from the intervention itself.
Conclusions
There is no conclusive scientific evidence that manual therapeutic interventions may exhibit any immediate or long-term effect on COP excursions. Any changes in sway may be attributable to decreases in pain intensity
Compensation of nonlinear effects in optical communication systems through phase-conjugation
No full textExperimental demonstration of nonlinearity and dispersion compensation in an embedded link by optical phase conjugation
No full textWe report in this letter, the experimental demonstration of simultaneous dispersion and nonlinearity compensation in an embedded link characterized by strongly asymmetrical power profiles. This result is obtained by using a highly efficient optical phase conjugator based on a periodically poled lithium-niobate waveguide, combined with two small dispersion-compensating elements properly inserted in the link
Nonlinear diffusion model for annealed proton-exchanged waveguides in zirconium-doped lithium niobate
No full textPhotorefractive-damage- (PRD) resistant zirconium-oxide-doped lithium niobate is investigated as a substrate for the realization of annealed proton-exchanged (APE) waveguides. Its advantages are a favorable distribution coefficient, PRD resistance comparable to magnesium-oxide-doped lithium niobate, and a proton-diffusion behavior resembling congruent lithium niobate. A 1D model for APE waveguides was developed based on a previous model for congruently melting lithium niobate. Evidence for a nonlinear index dependence on concentration was found
Fiber laser pumped continuous-wave single-resonant optical parametric oscillator
No full textWe report on what is to our knowledge the first continuous-wave (cw) optical parametric oscillator (OPO) that is pumped by a tunable fiber laser. The OPO is singly resonant for the signal wave and consists of a 40-mm-long periodically poled LiNbO3 crystal in a four-mirror ring cavity. At a pump power of 8.3 W provided by the wavelength-tunable Yb-doped fiber laser, the singly resonant OPO generates 1.9 W of 3200-nm cw idler radiation. The singly resonant OPO was tuned from 1515 to 1633 nm (signal) and from 3057 to 3574 nm (idler) by means of the crystal temperature and poling period. We obtained a wide idler tuning range, from 2980 to 3700 mn, by tuning the wavelength of the fiber laser from 1032 to 1095 nm
Lithium niobate photonics: Unlocking the electromagnetic spectrum
No full textLithium niobate (LN), first synthesized 70 years ago, has been widely used in diverse applications ranging from communications to quantum optics. These high-volume commercial applications have provided the economic means to establish a mature manufacturing and processing industry for high-quality LN crystals and wafers. Breakthrough science demonstrations to commercial products have been achieved owing to the ability of LN to generate and manipulate electromagnetic waves across a broad spectrum, from microwave to ultraviolet frequencies. Here, we provide a high-level Review of the history of LN as an optical material, its different photonic platforms, engineering concepts, spectral coverage, and essential applications before providing an outlook for the future of LN.Andreas Boes, Lin Chang, Carsten Langrock, Mengjie Yu, Mian Zhang, Qiang Lin, Marko Lončar, Martin Fejer, John Bowers, Arnan Mitchel
Design constraints of optical parametric chirped pulse amplification based on chirped quasi-phase-matching gratings
No full textPal Interpolation of Integral Types
No full textIn this paper, the author(s) discuss existence and uniqueness results of three so-called integral types of Pal interpolation schemes which are interesting extensions/ generalizations of classical Hermite-Fejer Interpolation problem. The results are of interest to approximation theory
New refinements of the inequalities of Hermite-Hadamard-Fejér type via fractional integral operators
No full textDuzce University1st International Conference on Mathematical and Related Sciences, ICMRS 2018 -- 30 April 2018 through 4 May 2018 -- 138225In this study, by using convex functions, we first establish new refinements of Hermite-Hadamard-Fejer type inequalities via Riemann-Liouville fractional integral operators. The results given in this paper provide generalization of several inequalities obtained in earlier studies. © 2018 Author(s)
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