High-power ytterbium-doped fibre master-oscillator power-amplifier at 1018 nm

A high-power master-oscillator power-amplifier (MOPA) at 1018 nm employing ytterbium (Yb)-doped fibres as a gain medium is reported. Utilizing a diffraction grating as a reflector, we could successfully suppress the influence of the broadband amplified spontaneous emission on the master-oscillator or the power-amplifier, resulting in stable amplification of the laser signal at 1018 nm. Based on a simple theoretical simulation on gain spectra and experimental investigation on parasitic lasing thresholds, the Yb fibre MOPA constructed in-house yielded 220 W of output at 1018 nm with a beam propagation factor (M2) of 1.1. The prospects for further power scaling are considered.

In vitro propagation and conservation of Leontopodium palibinianum Beauverd (Asteraceae), endemic species of Primorye Territory

The microclonal propagation protocol including initiation, propagation, rootage, and adaptation in the premises of the Botanical Garden-Institute FEB RAS was developed for the first time for a vulnerable endemic species of Primorye Territory Leontopodium palibinianum (Palibin’s edelweiss). It was shown that the medium’s mineral composition as well as changes in the concentration of exogenous growth regulators under the same light and temperature conditions had a substantial impact the processes of growth and morphogenesis of Palibin’s edelweiss. Optimal components of the microclonal propagation medium of the species were full strength Murashige and Skoog medium. Reducing in the salt amount leads to a slowdown and arrest of in vitro culture growth. Adding 2 mg/l of 6-BAP to the full strength MS medium led to mass production of plant material with the propagation factor of 9.8. It should be noted that GK3 has a positive effect on the Palibin’s edelweiss culture development in vitro when used together with low concentrations of 6-BAP. When 2.4-D was used at the concentration of 1 mg/l in the medium, direct organogenesis was observed after 14 days of cultivation and further accompanied by formation of additional plant shoots. Also, addition of 1 mg/l 2iP to the MS medium had the same effect. The growth regulators caused a low propagation factor (2.4), which in turn led to production of 2–3 regenerative plants. The IBA concentration of 2 mg/l stimulated formation of the root system capable of positively withstanding acclimatization under unsterile conditions, but lowering the IBA concentration to 1 mg/L of the medium also contributed to formation of such root system, with a slower pace. During acclimatization to ex vitroconditions plant survival did not depend on the types of mixtures being used. After the acclimatization plants are stretched in height and produced additional shoots on 20–25th day.

Beam Propagation Factor of Hollow Higher-order Cosh-Gaussian Beams

Based on the second-order moments definition, we investigate in this paper the beam propagation factor of new mathematical model of Hollow higher-order Cosh-Gaussian (HhCG) beams. Two analytical formulae of the M2-factor of HhCG beams are derived. Moreover, numerical simulations are developed to illustrate the effects of the beams orders n and l, the parameter δ and the beam waist ω0 on the M2-factor. The result shows a more general characteristic of higher-order Cosh-Gaussian, Cosh-Gaussian and the fundamental Gaussian beams can be obtained as specials cases of HhCG beams.

Upaya Pimpinan Komisariat Perguruan Tinggi IPNU IPPNU dalam Pencegahan Radikalisme di Kampus

Radikalisme adalah suatu aliran yang mempunyai keinginan perubahan pembaharuan sosial dan politik dengan cara kekerasan. seperti anarkisme, dalam kondisi ini masih dalam tahap pemikiran, inilah yang dikhawatirkan jika radikalisme menyebar di kampus Untuk mengantisipasi PKPT IPNU IPPNU organisasi di kampus IAIN Jember berupaya membentengi faham radikalisme. Untuk menanamkan nilai-nilai ke-Aswaja-an agar pemikiran mahasiswa tidak mudah terpengaruh oleh kaum radikalis. Penelitian ini menggunakan pendekatan kualitatif, Jenis penelitian yang digunakan adalah penelitian studi kasus, teknik pengumpulan data dalam penelitian ini menggunakan wawancara, observasi dan dokumenter, sedangkan analisis data yang digunakan adalah kondensasi data, penyajian data, dan penarikan kesimpulan. Keabsahan data yang digunakan adalah adalah triangulasi sumber dan triangulasi teknik. Penelitian ini memperoleh kesimpulan 1) indentifikasi radikalisme antara lain orang yang menganggap dirinya paling baik dan benar sendiri, menegakkan khilafah Islamiyah, berfikir tekstual, tidak menghargai perbedaan, tidak memandang keberagamaan, menolak moderasi agama, anti NKRI dan Pancasila. 2) Bentuk kegiatan PKPT IPNU IPPNU IAIN Jember dalam pecegahan radikalisme MAKESTA, (masa kesetiaan anggota) LAKMUD (latihan kader muda) Sholawatan, peringatan hari besar seperti Isra’Mi’roj, ziarah ke makam para wali. setiap malam jum’at Tahlilan, tiba’an, kajian mengenai kitab Arbain Nawawi, Ke-NUan, membahas isu-isu yang telah viral. 3) Faktor pendukung Internal kerja sama saling komunikasi pembina mengarahkan pengurus. Faktor penghambat internal, kurang saling komunikasi pengurus, anggota, pembiayaan sangat minim. Faktor pendukung Eksternal, bascampe, gedung, kelas, serambi Masjid. media sebagai sarana dakwah Faktor penghambatnya Eksternal tidak dapat pinjaman gedung. Kata kunci : Radikalisme, IPNU IPPNU, Aswaja. ABSTRACT Radicalism is a flow that has a desire to change social and political renewal in a violent way. Like anarchism, in this condition is still in the stage of thought, that way it feared if radicalism spreads on campus to anticipate PKPT IPNU IPPNU organization on campus IAIN Jember seeks to fortify the understand radicalism. To embed the values of the Aswaja so that students ' thinking is not easily affected by the radicalists. The study uses a qualitative approach, the type of research used is case study research, the data collection techniques in this study using interviews, observations and documentaries, while the data analysis used is data condensation, data presentation, and withdrawal conclusions. The validity of the data used is the source triangulation and the triangulation technique. The study obtained the conclusion 1) the identification of radicalism indicators among others who consider themselves best and true themselves, uphold Islamiyah Caliphate, think textual, do not appreciate the distinction, not to view its efficacy, reject religious moderation, anti NKRI and Pancasila. 2) The activity of PKPT IPNU IPPNU IAIN Jember in MAKESTA Pecegahan radicalism, (Member loyalty period) LAKMUD (training of young cadres) shovisit, a memorial Day such as Isra'mi ' Roj, a pilgrimage to the tomb of the Guardians. Every Friday night Tahlilan, Tiba'an, study of the book Arbain Nawawi, Ke-NUan, discusses issues that have been viral. 3) Internal supporting factor of mutual communication of the coach directs the caretaker. Internal inhibiting factor, less communication between admins, members, financing is minimal. External supporting factors, Bascampe, building, class, porch of the mosque. Media as a means of propagation factor external is unable to loan the building.

The organization of the virus-tested planting material production for the grape varieties of the local and foreign selection in Kazakhstan

The intensification of viniculture involves the organization of the virus-tested planting material production, establishment of the basic parent plantings, certification of the virus-tested planting material with the control of genetic stability of the grape plants propagated in tissue culture. The modified nutritional medium was developed for microclonal propagation of vine in vitro with the content of the free amino acids: glycine and glutamine, increasing propagation factor up to 15% and the number of nodes on microplant up to 27%.

A Method of Reducing Flight Delay by Exploring Internal Mechanism of Flight Delays

This paper explores the internal mechanism of flight departure delay for the Delta Air Lines (IATA-Code: DL) from the viewpoint of statistical law. We roughly divide all of delay factors into two sorts: propagation factor (PF), and nonpropagation factors (NPF). From the statistical results, we find that the distribution of the flight departure delay caused by only NPF exhibits obvious power law (PL) feature, which can be explained by queuing model, while the original distribution of flight departure delay follows the shift power law (SPL). The mechanism of SPL distribution of flight departure delay is considered as the results of the aircraft queue for take-off due to the airports congestion and the propagation delay caused by late-arriving aircraft. Based on the above mechanism, we develop a specific measure for formulating flight planning from the perspective of mathematical statistics, which is easy to implement and reduces flight delays without increasing operational costs. We analyze the punctuality performance for 10 of the busiest and the highest delay ratio airports from 155 airports where DL took off and landed in the second half of 2017. Then, the scheduled turnaround time for all flights and the average scheduled turnaround time for all aircraft operated by DL has been counted. At last, the effectiveness and practicability of our method is verified by the flights operation data of the first half of 2018.