Journal articles on the topic 'Streuli, Beat'

Rad istražuje odnos između pretraumatskih, peritraumatskih i posttraumatskih faktora i posttraumatskih psihopatoloških posledica, u cilju nalaženja faktora vulnerabilnosti za razvoj posttraumatskog stresnog poremećaja kod žrtava partnerskog zlostavljanja. Na uzorku od 41 ispitanice, starosti od 18 do 63 godine, koje su zbog izloženosti partnerskom zlostavljanju tokom ispitivanja boravile u skloništu za žrtve nasilja, primenjeni su instrumenti: Upitnik opštih podataka, Upitnik za procenu trauma u detinjstvu, inventar ličnosti Velikih pet plus dva, Upitnik za procenu nasilja nad ženama, Upitnik za procenu strategija prevladavanja (The Ways of Coping Questionnaire – Revised, WC-R), Skala za procenu ruminativnih odgovora (Ruminative Response Scale, RRS), Inventar za procenu supresije „Beli medved” (The ‘White Bear’ Suppression Inventory, WBSI), Upitnik za procenu interpersonalne podrške (The Interpersonal Support Evaluation List, ISEL) i PTSP ček lista – verzija za civile (The PTSD Checklist – Civilian version, PCL-C). Serijom hijerarhijskih regresionih analiza ispitana je struktura predikcije simptoma posttraumatskog stresnog poremećaja na osnovu pretraumatskih, peritraumatskih i posttraumatskih faktora. Rezultati ukazuju da dimenzija ličnosti Neuroticizam i ruminativni stil, kao kognitivna strategija prevladavanja, predstavljaju faktore koji utiču na razvoj simptoma posttraumatskog stresnog poremećaja nakon izloženosti partnerskom zlostavljanju. Nalazi istraživanja pokreću pitanja o međusobnom uticaju izdvojenih faktora vulnerabilnosti.

Results of an experimental and theoretical analysis of the proprerties of a LD pumped laser using a plano-concave stable resonator and KTP frequency-doubling crystal material are presented. The influence of thermal lens effect on laser output mode and beam quality has been discussed briefly by using the transfer matrix theory. In this paper, further experiment on the output beam quality of a LD pumped acousto-optic Q-switched laser has been also performed by adopting Hartmann-Shack wavefront sensor and Zernike mode reconstruction theory. Using this method, the PV and RMS values of the aberration wavefront, the frontal 35-order Zernike aberrations can be acquired, and the Strehl ratio curve of the output beam and the distribution of circle energy can also be obtained by calculation, so the mode properities can be fully understood. The experimental results show that the beam wavefront aberration is mainly concentrated in the frontal 15 orders of Zernike aberration, mainly including the defocus A3, the low-order astigmatism A4 and A5, and the coma aberration A6 and A7 because of crystal thermal effect.

Results of an experimental and theoretical analysis of the proprerties of a LD pumped laser using a stable resonator and second harmonic conversion crystal are presented. The influence of thermal lens effect on laser output mode and beam quality has been discussed briefly by using the transfer matrix theory. In this paper, further experiment on the output beam quality of a LD pumped acousto-optic Q-switched laser has been also performed by adopting Shack-Hartmann wavefront sensor and Zernike mode reconstruction theory. Using this method, PV and RMS error of aberration wavefront, the first 35-order Zernike aberrations can be acquired. Furthermore, Strehl ratio curve of output beam and the distribution of circle energy can also be obtained by further calculation, so mode properities can be comprehensively understood. Experimental results show that the beam wavefront aberration is mainly concentrated in the first 15 orders of Zernike aberration, mainly including the defocus A3, the low-order astigmatism A4 and A5, the coma and spherical aberration because of the thermal-lens effect.

Since the year 2000, adaptive optics (AO) has seen the emergence of a variety of new concepts addressing particular science needs; multiconjugate adaptive optics (MCAO) is one of them. By correcting the atmospheric turbulence in 3D using several wavefront sensors and a tomographic phase reconstruction approach, MCAO aims to provide uniform diffraction limited images in the near-infrared over fields of view larger than 1 arcmin2, i.e., 10 to 20 times larger in area than classical single conjugated AO. In this review, we give a brief reminder of the AO principles and limitations, and then focus on aspects particular to MCAO, such as tomography and specific MCAO error sources. We present examples and results from past or current systems: MAD (Multiconjugate Adaptive Optics Demonstrator) and GeMS (Gemini MCAO System) for nighttime astronomy and the AO system, at Big Bear for solar astronomy. We examine MCAO performance (Strehl ratio up to 40% in H band and full width at half maximum down to 52 mas in the case of MCAO), with a particular focus on photometric and astrometric accuracy, and conclude with considerations on the future of MCAO in the Extremely Large Telescope and post–HST era.

We discuss the use of measurements of the solar granulation contrast as a measure of optical quality. We demonstrate that for data recorded with a telescope that uses adaptive optics and/or post-processing to compensate for many low- and high-order aberrations, the RMS granulation contrast is directly proportional to the Strehl ratio calculated from the residual (small-scale) wavefront error (static and/or from seeing). We demonstrate that the wings of the high-order compensated point spread function for the Swedish 1-m Solar Telescope (SST) are likely to extend to a radius of not more than about 2″, which is consistent with earlier conclusions drawn from stray-light compensation of sunspot images. We report on simultaneous measurements of seeing and solar granulation contrast averaged over 2 s time intervals at several wavelengths from 525 nm to 853.6 nm on the red-beam (CRISP beam) and wavelengths from 395 nm to 484 nm on the blue-beam (CHROMIS beam). These data were recorded with the SST, which has been revamped with an 85-electrode adaptive mirror and a new tip-tilt mirror, both of which were polished to exceptionally high optical quality. Compared to similar data obtained with the previous 37-electrode adaptive mirror in 2009 and 2011, there is a significant improvement in image contrast. The highest 2 s average image contrasts measured in April 2015 through 0.3−0.9 nm interference filters at 525 nm, 557 nm, 630 nm, and 853.5 nm with compensation only for the diffraction limited point spread function of SST are 11.8%, 11.8%, 10.2%, and 7.2%, respectively. Similarly, the highest 2 s contrasts measured at 395 nm, 400 nm, and 484 nm in May 2016 through 0.37−1.3 nm filters are 16%, 16%, and 12.5%, respectively. The granulation contrast observed with SST compares favorably to measured values with SOT on Hinode and with Sunrise as well as major ground-based solar telescopes. Simultaneously with the above wideband red-beam data, we also recorded narrowband continuum images with the CRISP imaging spectropolarimeter. We find that contrasts measured with CRISP are entirely consistent with the corresponding wideband contrasts, demonstrating that any additional image degradation by the CRISP etalons and telecentric optical system is marginal or even insignificant. Finally, we discuss the origin of the 48 nm RMS wavefront error needed to bring consistency between the measured granulation contrast and that obtained from 3D simulations of convection.

Relevance. Most of the pea varieties used in the production of canned vegetables have similar morphological structure of the stalk: shortened internodes, their limited number and location in the upper part of the stalk. The deficiency of such plant architectonics is the limitation of yielding capacity in relation to small number of yielding nodes, yielding capacity instability, and high degree of affliction by plant diseases. The production of pea varieties having an increased number of yielding nodes will allow changing the relation between the nonproductive and reproductive parts to the advantage of the latter.Methods. The pea varieties from the collection of bean cultures laboratories of the Federal Scientific Vegetable Center were used as the research varieties. The main method of work was intervarietal hybridization with subsequent single plant selection. In 2018-2019 the selected lines were seeded in a nursery with an area of 7 m2 . The forms with changed flowering pattern (Pervenets, Ranniy 28-11, Wenson) and the most yielding early and midseason varieties (Dakota, Ranniy Gribovsky 11, Voronezhsky Zelyony, Korsar, Orus, Viola, Zelyonaya Strela, Quartella) were used as parent components. The selection was performed on the basis of the following features: changed flowering pattern, the number of yielding nodes, the number of legumes on a node, as well as the length of a bean and the number of seeds in a legume. A finometer was used for the determination of the green pea hardness.Results. Sample 50-4-19 having a relatively low number of yielding nodes (6, 9) had the highest characteristics and was considerably superior to all the other samples by its yielding capacity during the first and the second harvesting periods (7.24 and 9.55 tons per hectare). The selection of the early forms with the changed flowering pattern and the shift of the attraction centre to the 2nd or to the 3rd node allow carrying out breeding aimed at increasing the early ripeness and the yielding capacity of peas.

В стандартных условиях проведен модельный эксперимент по влиянию сил обеднения на процесс высыхания капли взвесей невзаимодействующих частиц аэросил – полистирольный латекс. Впервые обнаружен быстропротекающий процесс фазового превращения аэросила в кристаллический SiO2 в течение десятков секунд, сопровождающийся резким изменением цвета раствора от светло-голубого до синего. Обнаружена дифракционная картина, свидетельствующая о нанокристаллической природе зародышеобразования новой фазы. Фазообразование интерпретировано как результат действия неравновесной силы обеднения в условиях гидродинамической неустойчивости высыхающей капли. REFERENCES Tret’yakov Yu. D. Self-organisation processes in the chemistry of materials. Uspekhi khimii [Russian Chemical Reviews], 2003, v. 72(8), pp. 651–679. https://doi.org/10.1070/RC2003v072n08ABEH000836 Kushnir S. E., Kazin P. E., Trusov L. A., Tret’yakov Yu. D. Self-organization of micro- and nanoparticles in ferrofl uids. 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Marcada pelo forte investimento na relação entre arte e cotidiano, a obra de Beat Streuli privilegia a ação banal, o comum, o habitual e o anônimo como os elementos chaves para a experiência com as imagens. Sua obra permite questionar a possibilidade de experiência estética a partir de imagens banais do cotidiano de pessoas quaisquer. Partimos da premissa de que as imagens apresentadas por Beat Streuli constituem-se como lugares privilegiados para pensarmos a relação entre experiência estética e cotidiano na contemporaneidade, bem como as múltiplos papéis da fotografia no campo das artes.

We report on the energetic and beam quality performance of the second to the last main amplifier section HEPA I of the PEnELOPE laser project. A polarization coupled double-12-pass scheme to verify the full amplification capacity of the last two amplifiers HEPA I and II was used. The small signal gain for a narrow-band continuous wave laser was 900 and 527 for a broadband nanosecond pulse, demonstrating 12.6 J of output pulse energy. Those pulses, being spectrally wide enough to support equivalent 150 fs long ultrashort pulses, are shown with an excellent spatial beam quality. A first active correction of the wavefront using a deformable mirror resulted in a Strehl ratio of 76% in the single-12-pass configuration for HEPA I.