Efficacy of the SU(3) scheme for ab initio large-scale calculations beyond the lightest nuclei

We report on the computational characteristics of ab initio nuclear structure calculations in a symmetry-adapted no-core shell model (SA-NCSM) framework. We examine the computational complexity of the current implementation of the SA-NCSM approach, dubbed LSU3shell, by analyzing ab initio results for 6Li and 12C in large harmonic oscillator model spaces and SU(3)-selected subspaces. We demonstrate LSU3shell's strong-scaling properties achieved with highly-parallel methods for computing the many-body matrix elements. Results compare favorably with complete model space calculations and significant memory savings are achieved in physically important applications. In particular, a well-chosen symmetry-adapted basis affords memory savings in calculations of states with a fixed total angular momentum in large model spaces while exactly preserving translational invariance.Comment: 11 pages, 8 figure

Collective Modes in Light Nuclei from First Principles

Results for ab initio no-core shell model calculations in a symmetry-adapted SU(3)-based coupling scheme demonstrate that collective modes in light nuclei emerge from first principles. The low-lying states of 6Li, 8Be, and 6He are shown to exhibit orderly patterns that favor spatial configurations with strong quadrupole deformation and complementary low intrinsic spin values, a picture that is consistent with the nuclear symplectic model. The results also suggest a pragmatic path forward to accommodate deformation-driven collective features in ab initio analyses when they dominate the nuclear landscape.Comment: 5 pages 3 figures, accepted to Physical Review Letter

Experimental investigation of tsunami waves generated by granular collapse into water

The generation of a tsunami wave by an aerial landslide is investigated through model laboratory experiments. We examine the collapse of an initially dry column of grains into a shallow water layer and the subsequent generation of waves. The experiments show that the collective entry of the granular material into water governs the wave generation process. We observe that the amplitude of the wave relative to the water height scales linearly with the Froude number based on the horizontal velocity of the moving granular front relative to the wave velocity. For all the different parameters considered here, the aspect ratio and the volume of the column, the diameter and density of the grains, and the height of the water, the granular collapse acts like a moving piston displacing the water. We also highlight that the density of the falling grains has a negligible influence on the wave amplitude, which suggests that the volume of grains entering the water is the relevant parameter in the wave generation.Comment: 23 pages, 16 figure

Ways to Enhance Students’ Learning Activities in the Context of Higher Education

The article aims to study scientific and methodological features of the ways to enhance students’ learning activities in the context of higher education. The study's theoretical significance is derived from the in-depth analysis of the development of students' learning activity. The study offers the framework of characteristics for the concept of “students' learning (cognitive) activity". The main used methods were: analysis, peer-assessment, self-assessment. The interview method was used to make a cognitive profile of the participants, taking into account their psychological characteristics. The authors developed and scientifically tested educational model based on module curricula and interactive teaching methods to enhance students' learning activity. The authors also reflected the dynamic of the learning activity of the students with disabilities participating in the experiment. The results proved the effectiveness of the developed model of enhancing students' learning activity by using interactive teaching methods. It was concluded that the module curricular and active teaching methods help enhance students with disabilities' learning activity and make them more responsible in respect to the results of their study

Rootstocks and Varieties of Fruits, Berry Crops, and Grapes, Used for Intensive Gardening in Kazakhstan

The results of the study of clonal rootstocks of apple trees of various ecological and geographical origins, varieties of fruit, berry crops, and grapes of local selection are presented. According to the efficiency of reproduction in the mother liquor and fields of nursery formation, as well as the short stature of trees of grafted varieties in the garden, precocity and productivity, clonal rootstocks of the apple tree B7-35, Arm18, 62-396, and B16-20 were distinguished. Their important role in unlocking the potential of ancient apple varieties in the south and southeast of Kazakhstan. These rootstocks and varieties are recommended for propagation and creation of highly productive orchards. The Ministry of Agriculture of the Republic of Kazakhstan provided funding within the framework of the budget program 267 “Improving the availability of knowledge and scientific research” under subprogram 101 “Program-targeted financing of scientific research and activities” – Creation of varieties and hybrids of fruit and berry, nut crops and grapes based on the achievements of bio and IT technologies, 2021–2023yy. No. BR10765032

Tailoring the transverse mode of a high-finesse optical resonator with stepped mirrors

Enhancement cavities (ECs) seeded with femtosecond pulses have developed into the most powerful technique for high-order harmonic generation (HHG) at repetition rates in the tens of MHz. Here, we demonstrate the feasibility of controlling the phase front of the excited transverse eigenmode of a ring EC by using mirrors with stepped surface profiles, while maintaining the high finesse required to reach the peak intensities necessary for HHG. The two lobes of a TEM01 mode of a 3.93m long EC, seeded with a single-frequency laser, are delayed by 15.6 fs with respect to each other before a tight focus, and the delay is reversed after the focus. The tailored transverse mode exhibits an on-axis intensity maximum in the focus. Furthermore, the geometry is designed to generate a rotating wavefront in the focus when few-cycle pulses circulate in the EC. This paves the way to gating isolated attosecond pulses (IAPs) in a transverse manner (similarly to the attosecond lighthouse), heralding IAPs at repetition rates well into the multi-10MHz range. In addition, these results promise high-efficiency harmonic output coupling from ECs in general, with an unparalleled power scalability. These prospects are expected to tremendously benefit photoelectron spectroscopy and extreme-ultraviolet frequency comb spectroscopy

RNAi-Mutants of <em>Sorghum bicolor</em> (L.) Moench with Improved Digestibility of Seed Storage Proteins

Modification of the composition of grain storage proteins is an intensively developing area of plant biotechnology, which is of particular importance for sorghum – high-yielding drought tolerant crop. Compared to other cereals, the majority of sorghum cultivars and hybrids are characterized by reduced nutritional value that is caused by a low content of essential amino acids in the seed storage proteins (kafirins), and resistance of kafirins to protease digestion. RNA interference (RNAi) by suppressing synthesis of individual kafirin subclasses may be an effective approach to solve this problem. In this chapter, we review published reports on RNAi silencing of the kafirin-encoding genes. In addition, we present new experimental data on phenotypic effects of RNAi-silencing of γ-KAFIRIN-1 gene in sorghum cv. Avans. To obtain RNAi mutants with γ-KAFIRIN-1 gene silencing we used Agrobacterium-mediated genetic transformation. Transgenic kernels had modified endosperm type with reduced vitreous layer and significantly improved in vitro protein digestibility (93% vs. 57%, according to the densitometry of SDS-PAGE patterns). SDS-PAGE of transgenic kernels showed lowered level of kafirins and appearance of globulin proteins, which were not observed in the original cultivar. For the first time, the cases of instability of inserted genetic construct were identified: elimination of ubi1-intron that is a constituent part of the genetic construct for RNAi silencing, or nos-promotor governing expression of the marker gene (bar) (in the RNAi mutants of cv. Zheltozernoe 10). The research findings presented in this chapter provide strong evidence that RNA interference can be used for improvement of the nutritional properties of sorghum grain

Legal Regulation of State Electronic Services: Relevant Issues and Ways of Improvement

The emergence of new platforms to promote concepts such as e-government and open data, which are currently being actively implemented in many countries around the world, and, more importantly, the need to promote civic participation and engagement in this regard, which are perhaps two key components for the successful implementation of any modern e-government project, provide both new opportunities and challenges for policy makers in implementing this idea in the Republic of Kazakhstan, which is actively trying to technologically reform the public sector. The result of the policy of implementing the e-government in the Republic of Kazakhstan was the creation of a single e-government portal with unified databases and unified electronic services for the entire country, which were integrated into a single area of the concept in both the political and technological meaning. At present, public services are provided by personal contact through the offices of the Public Service Centre and online through the e-government portal, whose projects include dozens of different information systems, registers, and state databases, and hundreds of applications and services. In modern realities in the Republic of Kazakhstan, it is necessary to conduct a survey to measure the effectiveness of public services, similar to Citizens First in Canada, in order to determine the quality and comparison in the survey, a Common Measurement Tool can be used. As a result of the study, it was also concluded that the following aspects of legal regulation need to be improved in the Republic of Kazakhstan: the establishment of a body for monitoring and protecting information data, as well as the consideration of complaints regarding the violations of the right to protect information data; the need to consolidate national legislation in the field of e-government into a single legal act; the establishment of an interdepartmental state body in the field of e-government