Humerus varus congenitus (author's transl) Paneva-Holevitch, E; Yankov, E
Revue de chirurgie orthopédique et réparatrice de l'apparell moteur,
1979 Jan-Feb, Volume:
65, Issue:
1
Journal Article
Two cases of humerus varus congenitus have been treated by lengthening of the humerus using an external distraction device. The first was lengthened by about 6 centimetres and the second by about ...four centimetres. In one case, primary bone union was obtained and in the second, secondary grafting had to be done. The clinical results were satisfactory.
We experimentally demonstrate a rate-adaptive concatenated forward error correction (FEC) scheme to minimize the information rate loss due to varying channel conditions. The concatenated coding ...scheme is based on inner soft-decision polar code and outer hard-decision staircase code. An experiment in a wavelength-division multiplexed (WDM) system with different SNR per WDM channel is performed by employing concatenated codes with various coded modulation schemes over a target distance of 140km which is relevant for extending the reach of data center interconnects. Experimental results show that the achieved data rate of the WDM system can be improved up to 37.6% with the proposed coding scheme w.r.t. the fixed code rate ZR FEC.
Because small increments in levels of endogenous plasma estradiol are associated with higher postmenopausal bone mineral density, we investigated the safety and effectiveness in preventing bone loss ...of unopposed, very-low-dose transdermal estradiol for postmenopausal women.
This was a randomized, placebo-controlled, double-blind trial with 2-year follow-up at 9 United States clinical centers. The study population comprised 417 postmenopausal women, aged 60-80 years, with intact uterus and bone mineral density z scores of -2.0 or higher, who were randomly assigned to receive either unopposed transdermal estradiol at 0.014 mg/d (n = 208) or placebo (n = 209). All participants received calcium and vitamin D supplementation. Lumbar spine and total hip bone mineral density change was measured by dual-energy X-ray absorptiometry; endometrial hyperplasia incidence was assessed by endometrial biopsy.
Median plasma estradiol level in the estradiol group increased from 4.8 pg/mL at baseline to 8.5 pg/mL at 1 year (P <.001 versus baseline) and to 8.6 pg/mL at 2 years (P <.001 versus baseline) and was unchanged in the placebo group. Lumbar spine bone mineral density increased 2.6% in the estradiol group and 0.6% in the placebo group (between-group difference 2.0%, P <.001). Mean total hip bone mineral density increased 0.4% in the estradiol group and decreased 0.8% in the placebo group (between-group difference 1.2%, P <.001). Osteocalcin levels and bone-specific alkaline phosphatase were lower in the estradiol group than the placebo group (P <.001 each). Endometrial hyperplasia developed in 1 woman in the estradiol group but in none of the placebo group (difference in 2-year rates 0.5%, 95% confidence interval 0-7.3%).
Postmenopausal treatment with low-dose, unopposed estradiol increased bone mineral density and decreased markers of bone turnover without causing endometrial hyperplasia.
Our research was motivated by the specific properties of noble-metal nanoparticles and their wide applications. The resonance frequency for noble-metal nanostructures is in the near-UV and visible ...spectral ranges, where most of the commercially-available lasers oscillate. This makes these materials attractive candidates for studying their properties in view of efficient applications. We investigated filaments formation in Au-ion-doped glass materials, transparent in the visible range, during irradiation by femtosecond laser pulses. Second harmonic generation in the media was observed as well. This proved the formation of polycrystalline structures inside the media after femtosecond laser radiation. Further, self-phase modulation and continuum were observed. Thus, the nonlinearity of the media is higher than that of glass not doped with noble-metal particles. The nonlinear effects in the samples were investigated in terms of the laser beam parameters. The laser energy applied was between 10 - 40 μJ. The wavelengths used were in the range 240 - 2600 nm, as generated by an optical parametric amplifier system (TOPAS). The regenerative Ti:Sapphire amplified laser system emits at a central wavelength of 800 nm with a pulse duration of 35 fs and 1-kHz repetition rate.
Diffraction-free femtosecond optics Iordanova, E.; Yankov, G.; Karatodorov, S. ...
Optik (Stuttgart),
October 2022, 2022-10-00, Volume:
267
Journal Article
Peer reviewed
In the present experiment, a diffraction-free propagation regime of 35 fs pulse with powers significantly lower than the critical self-focusing is observed. This regime is characterized by preserving ...the initial Gaussian profile of the pulse at several diffraction lengths and without Fresnel diffraction. The theoretical investigation shows that such an effect can be obtained in the frame of nonparaxial evolution equation only and pulses with a light disk form. The numerical solving of the no paraxial equation confirms the theoretical and experimental results under investigation.
Compensation of Kerr nonlinearity-induced distortions has been shown to allow for increasing transmission rate and reach, with optical compensation techniques particularly attractive for broadband ...wavelength-division multiplexed (WDM) scenarios. However, they normally require additional devices within the link, which is particularly challenging for already deployed systems, and even more so for unrepeatered transmission. In this work, we focus on providing lumped optical nonlinearity suppression, either at the transmitter or at the receiver side, based on optical phase conjugation (OPC). The theory to design scaled-down OPC compensation modules is derived, and it allows to move beyond the standard mid-link OPC approach and to explore compensation modules with fibers types not directly linked to the dispersion properties of the transmission link. This design method is then validated both through numerical investigations and experimental demonstrations for a number of systems with a varying degree of complexity. Ultimately, significant performance improvement is shown by employing short OPC-based compensation structures which are carefully designed to match much longer transmission links.
The ultra-short optical pulses can be used for the confinement of neutral particles by an additional optical longitudinal force, connected with the Poynting vector and the influence of the magnetic ...field on their polarizability. The Poynting vector is connected also to the intensity of the electromagnetic field. On other hand, the intensity of a laser pulse can be manipulated by an optical lens, and thus, indirectly, the optical force can be increased or decreased or its direction to be changed. This in turn enables a unique possibility for the compression of neutral atoms, molecules, and particles into the focus of the lens. Here, we reported on an experimental study of neutral particle confinement in the focus of femtosecond laser pulses and further confirmed by a theoretical investigation. The findings demonstrate an innovative approach to the compression and confinement of neutral particles within the focal plane of a lens and their further manipulation. Feasible applications could be in the field of cold nuclear fusion and cooling of light-neutral atoms and molecules.
We present a case of a male patient who underwent right-sided pneumonectomy due to central low-grade squamous cell carcinoma of the right lung, chemo-, radio-, and immunotherapy. However, the disease ...progressed. In addition the patient got SARSCoV-2 pneumonia in the left lung, followed by postpneumonectomy empyema. Right-sided uniportal video-assisted thoracoscopy, debridement, and definitive drainage of the pleural cavity were performed.
Abstract
The present research aims to investigate the modification and activation effects on medical-grade polydimethylsiloxane (PDMS) polymer irradiated by ultrashort laser pulses. The motivation of ...the current study is based on the wide use of the PDMS material in medicine and, more specifically, in implantable neural interface applications. Systematic measurements are carried out to characterize the effect of the laser beam parameters on the optical absorption and the surface morphology with respect to the laser-treated zones. The PDMS polymer is modified by surface tracks after the femtosecond laser processing. The optical properties of the PDMS are investigated to prove the effective laser activation of the surface, which ensures further successful metallization of the modified tracks. It is seen that defective transformations occur in the entire laser-treated area when the number of pulses is increased. The preliminary observation indicates promising results regarding the implementation of such a laser-based method for micro-or nano-processing of optically transparent biopolymers for interface devices in bioengineering technologies, such as neural implants and interface applications.
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