Bulk-sensitive Photoemission of Mn5Si3

We have carried out a bulk-sensitive high-resolution photoemission experiment on Mn5Si3. The measurements are performed for both core level and valence band states. The Mn core level spectra are deconvoluted into two components corresponding to different crystallographic sites. The asymmetry of each component is of noticeable magnitude. In contrast, the Si 2p spectrum shows a simple Lorentzian shape with low asymmetry. The peaks of the valence band spectrum correspond well to the peak positions predicted by the former band calculation.Comment: To be published in: Solid State Communication

Electron spin resonance study on the 4f honeycomb quantum magnet YbCl3

The local magnetic properties of Yb$^{3+}$ in the layered honeycomb material YbCl$_{3}$ were investigated by electron spin resonance on single crystals. For in-plane and out-of-plane field orientations the $g$-factor shows a clear anisotropy ($g_\|=2.97(8)$ and $g_\bot =1.53(4)$), whereas the low temperature exchange coupling and the spin relaxation display a rather isotropic character. At elevated temperatures the contribution of the first excited crystal field level ($21\pm2$~meV) dominates the spin relaxation.Comment: 10 pages, 5 figure

Healthy life students and its reflection in professional activity

This article discusses the role of the university in the importance of physical education as part of the general culture of the individual and society, the formation by means of physical culture and sports the necessary competenciesВ статье рассматривается значимость физической культуры как части общей культуры личности и общества, формирование средствами физической культуры и спорта необходимых компетенци

Microstructural evolution of layered K-doped RuCl₃ during annealing traced by thermogravimetric analysis and 3D electron diffraction

Nanoscale phase separation was induced in the K-doped RuCl3 van der Waals material by annealing, and studied with the goal to find a natural design strategy for the formation of two-dimensional architectures as an alternative to the costly and time-consuming experimental artificial growth methods. Phase conversion was traced by means of thermogravimetric analysis combined with mass spectrometry. The local crystal structure of co-existing K3Ru2Cl9 domains with the sizes of about 100 nm was solved by 3D electron diffraction.</p

Ways to control asynchronous motor with phase rotor of mining machines

The article describes various methods of controlling asynchronous motors with a phase rotor. To solve the problems of controlling speeds and moments in a modern electric drive, two main methods of frequency control are used: scalar and vector. Advantages and disadvantages of scalar and vector control, voltage dependence are given

T35 Epigenetic changes in human cervical carcinomas associated with viral induced pathogenesis

Epigenetics investigates mechanisms that control inheritance of gene expression program during somatic cell divisions. These mechanisms include regulation by DNA methylation, histone post-translational modifications and nucleosome positioning, functioning of regulatory non-coding RNAs, control of alternative splicing of mRNA precursors and high-order chromatin organization. Genome-wide loss of epigenetic stability and increased epigenetic plasticity are common features of all tumor types. In normal tissues epigenetic plasticity allow cells to response on environment signals. Thus, in tumor cells its constitutive activation leads to epigenetic heterogeneity that are the additional hallmark of the most of the classical cancers. Cervical cancers are one of the most interesting models for the analysis of the role of epigenetic changes in tumor progression. These types of tumors are associated with infection of human papilloma viruses of so-called high-risk group (HR-HPV) and characterized by well-defined stages of malignant conversion from intraepithelial neoplasias to carcinomas. The viral DNA can persist in episomal form or integrates into the host-cell genome.Cellular genomes encode genetic information in their linear sequence, but appropriate gene expression requires chromosomes to fold into dynamic complex three-dimensional structures. Scaffold/matrix attachment regions (S/MARs) are specialized genomic DNA sequences that take part in organization of these structures. We demonstrated that methylation of S/MARs was required for their attachment to nuclear matrix and that methylation status of S/MARs was changed in cervical cancer cell compared to normal cells.DNA methylation plays an important role in the regulation of gene expression. We found that methylation of the regulatory sequences in the HPV16 genome specifically changes in transformed compared to the normal cervical epithelial cells. Next, we showed that methylation of the transcription factor binding sites modulates the viral oncogene expression. These data suggest that the HPV16 genome methylation may represent an important mechanism that initiates the development of HPV-associated tumors.Using next generation sequencing, we identified pattern of differentially expressed microRNAs in clinical samples of the cervical lesions. We confirmed expression of microRNAs that have been described previously as well as identified new microRNAs that can be potentially involved in the development and progression of cervical cancer. Spectrum of differentially expressed microRNAs includes microRNAs targeting tumor-suppressor genes as well as oncogenes.Telomerase is a key regulator of cell proliferation. This enzyme is silent in normal cells and activated in most of the tumors. Few forms of RNA (hTERT), encoded by telomerase gene were detected in different tumor cells and among them three forms (alfa, beta and gamma) are most well pronounced. We found that in cervical tumors expression of all three forms are significantly increased. In some cases, we also observe higher level of hTERT expression in neighboring “normal tissue”. The correlation between expression levels of these three forms varied on different stages of the disease (three stages on intraepithelial neoplasias and carcinomas). The function of these three hTERT forms is still not well understood

Spin Polarization and Magneto-Coulomb Oscillations in Ferromagnetic Single Electron Devices

The magneto-Coulomb oscillation, the single electron repopulation induced by external magnetic field, observed in a ferromagnetic single electron transistor is further examined in various ferromagnetic single electron devices. In case of double- and triple-junction devices made of Ni and Co electrodes, the single electron repopulation always occurs from Ni to Co electrodes with increasing a magnetic field, irrespective of the configurations of the electrodes. The period of the magneto-Coulomb oscillation is proportional to the single electron charging energy. All these features are consistently explained by the mechanism that the Zeeman effect induces changes of the Fermi energy of the ferromagnetic metal having a non-zero spin polarizations. Experimentally determined spin polarizations are negative for both Ni and Co and the magnitude is larger for Ni than Co as expected from band calculations.Comment: 4 pages, 3 figures, uses jpsj.sty, submitted to J. Phys. Soc. Jp

Magneto-Coulomb Oscillation in Ferromagnetic Single Electron Transistors

The mechanism of the magneto-Coulomb oscillation in ferromagnetic single electron transistors (SET's) is theoretically considered. Variations in the chemical potentials of the conduction electrons in the ferromagnetic island electrode and the ferromagnetic lead electrodes in magnetic fields cause changes in the free energy of the island electrode of the SET. Experimental results of the magneto-Coulomb oscillation in a Ni/Co/Ni ferromagnetic SET are presented and discussed. Possible applications of this phenomenon are also discussed.Comment: 24 pages Latex, 5 figures in GIF files, style files included. Revised version: some errors are corrected and further discussions are added. To be published in J. Phys. Soc. Jpn. Vol.67 (1998) No.

European experience of human resources development for micro business: relevance and implementation algorithm for the republic of Moldova

Значна частина мікропідприємств Євросоюзу являє собою самозайняті підприємства або підприємців. У країнах ЄС-28 самозайнятих підприємств, які мають 0% найманих робітників і становлять 56% від усього сектору малого та середнього бізнесу. Європейські експерти приділяють багато уваги зміцненню і розвитку даного сектора економіки. У всіх країнах ЄС організовані програми для підтримки діяльності самозайнятих підприємців, багато з яких були б корисні до впровадження в Республіці Молдова. У Молдові схожі характеристики мають мікропідприємства, які відносяться до сектору малого та середнього бізнесу і займають 85,1% від загальної кількості підприємств малого бізнесу. Відповідно, у статті було проаналізовано програми розвитку мікробізнесу у країнах Європейського Союзу, враховуючи найбільш важливі для підприємців. Новизна і практична значимість статті обумовлені рекомендаціями, які включають алгоритм впровадження європейського досвіду програм розвитку самозайнятих підприємців в секторі малого бізнесу Молдови.Many of the EU-28 SMEs are run by self-employed micro enterprises. In the EU-28 self-employed enterprises with 0% of employees consist 56% of the SME. European experts attach great importance to the strengthening and development of this sector of the economy. All EU countries have organized programs to support the activities of self-employed entrepreneurs, many of which would be useful for implementation in the Republic of Moldova. In Moldova, microenterprises have similar characteristics, which belong to the small and medium-sized business sector and occupy 85.1% of the total number of small businesses. Accordingly, the article analyzes the programs of microbusiness development in the European Union, including the most important ones, according to the entrepreneurs opinians. The novelty and practical significance of the article are due to the recommendations, including the algorithm of implementation of the European experience of development programs for self-employed entrepreneurs in the SME sector of Moldova.Значительная часть микропредприятий Евросоюза представляет собой самозанятые предприятия или предпринимателей. В странах ЕС-28 самозанятые предприятия, имеющие 0% наемных рабочих, составляют 56% от всего сектора малого и среднего бизнеса. Европейские эксперты придают большое значение укреплению и развитию данного сектора экономики. Во всех странах ЕС организованы программы для поддержки деятельности самозанятых предпринимателей, многие из которых были бы полезны к внедрению в Республике Молдова. В Молдове близкие характеристики имеют микропредприятия, которые относятся к сектору малого и среднего бизнеса и занимают 85,1% от общего числа предприятий малого бизнеса. Соответственно, в статье проанализированы программы развития микробизнеса в Европейском Союзе, включая наиболее важные, по мнению самих предпринимателей. Новизна и практическая значимость статьи обусловлены рекомендациями, включающими алгоритм внедрения европейского опыта программ развития самозанятых предпринимателей в секторе малого бизнеса Молдовы