High-Power Quantum Cascade Lasers Emitting at 8 μm: Technology and Analysis.

In this work, we demonstrate the features of a two-stage epitaxial growth technique and show the results of power and efficiency measurements for three different designs of quantum cascade lasers with a record-high peak power in the 8 μm spectral region. The time-resolved QCL spectral study proves that InP-based upper cladding paired with an InP contact layer provides better heat dissipation and allows one to reach better power characteristics in comparison with InGaAs-based contact, even with short pulse pumping.

Conical refraction with low-coherence light sources.

We report on conical refraction (CR) with low-coherence light sources, such as light-emitting diodes and decoherentized HeNe laser radiation, and demonstrate different CR patterns. In our experiments, a variation of the pinhole sizes from 25 to 100 µm and the distances to pinhole from 50 to 5 cm reduced spatial coherence of radiation that resulted in the disappearance of the dark Poggendorff's ring in the Lloyd's plane. This is attributed to the interference nature of the Lloyd's distribution and found to be in excellent agreement with the paraxial dual-cone model of conical refraction.

3D laser nano-printing on fibre paves the way for super-focusing of multimode laser radiation.

Multimode high-power laser diodes suffer from inefficient beam focusing, leading to a focal spot 10-100 times greater than the diffraction limit. This inevitably restricts their wider use in 'direct-diode' applications in materials processing and biomedical photonics. We report here a 'super-focusing' characteristic for laser diodes, where the exploitation of self-interference of modes enables a significant reduction of the focal spot size.

[Method of customized analysis of tension deformities in fixed dental restorations].

The paper presents the technique for transporting CT and CAD 3D-modelling data in software for tension deformities analysis with the possibility for customizing physical properties of certain anatomical structures and constructive materials. The obtained data allowed performing analyzing of tension deformities of dental restorations in ANSYS software.

Influence of neuropeptides on the processes of higher nervous activity in primates. The action of cyclic analogs of enkephalins on the behavior of the lower monkeys.

The effect of two cyclic enkephalin analogs (IVS-43 and IVS-46) on the group and individual behavior of rhesus macaques and hamadryas baboons has been studied. A pronounced influence of IVS-46 on competitive and operant goal-directed behavior of the monkeys was identified.

[The effect of neuropeptides on the processes of higher nervous activity in primates. The action of cyclic analogs of enkephalins on the behavior of lower monkeys].

The influence of 2 cyclic enkephaline analogues (IVS-43 and IVS-46) on group and individual behaviour of rhesus and baboon monkeys was studied. The effect of IVS-46 on competitive and operant goal-directed behaviour of the monkeys was expressed. Possible mechanisms of functional reorganization of the higher nervous activity of primates under the influence of neuropeptides are discussed.

[The comparative action of relanium and oxytocin on higher nervous activity in lower monkeys].

Effects of relanium and oxytocin on higher nervous activity was studied in four rhesus monkeys (Macaca mulatta) and two baboons (Papio hamadryas). During observation of the animals in enclosure tranquilizing effect was seen only after relanium administration. Under the same conditions oxytocin practically did not change the general behaviour pattern of monkeys.

[Behavioral effects of thyroliberin on animals of various species].

It has been shown that there are some significant differences in behavioural effects of exogenous thyroliberin for different mammals (mice, rats, dogs, monkeys). The necessity of a careful preclinical trial of peptide drugs is discussed.

[Endocrine system reaction in relation to the clinical manifestations of lung cancer].

Using radiobiochemical methods "in vitro" by means of determining hormone production in blood serum, the authors studied the functional state of the hypophysis, adrenal glands, the pancreas and thyroid in 51 patients with lung cancer: stage I--in 8 patients, II--in 7, III--in 23 and IV--in 13. Histological structure: adenocarcinoma--in 9, epidermoid cancer--in 29, undifferentiated cancer--in 5. The analysis indicated that the hormonal disbalance in the organism of lung cancer patients is not evidenced by secondary clinical manifestations of the disease (atelectasis, suppuration, etc), there being a number of general regularities in the response of the hypophysis, adrenal glands, the pancreas and thyroid depending on the stage.