bluuebunny/crossref_metadata_2025_split huggingface dataset:
Readiness For Development of Tourism Villages in Pangkalpinang City
Authors: Valeriani Devi , Wulandari Ayu , Nurwasya Nurwasya , Marlina Marlina 
Published: April 2024

This research analyzes the readiness of Tourism Village Development in Pangkalpinang City by identifying the potential and readiness of tourist village components consisting of tourist attractions, accessibility, amenities, supporting facilities and tourism institutions, marketing and community participation. This research uses a qualitative approach with evaluative and stakeholder analysis. The data in this research was taken through interviews and observation carried out in three areas, namely Kampung Tua Tunu, Kampung Jerambah Gantung and Kampung Selindung. Using a purposive sampling method, the respondents in this research were the government, private sector and the community from each village. The results of this research show that Kampung Tua Tunu is categorized as an embryonic tourism village with stakeholders classified as Key Players and Crowd of four respondents each, stakeholders classified as Context Setters as many as one respondent and there are no stakeholders as Subjects. Jerambah Gantung Village is categorized as an embryonic tourism village with stakeholders classified as Key Players totaling four respondents, stakeholders classified as Subject and crowd each with three respondents and there are no stakeholders as Context Setters. Then Selindung Village is categorized as a Developing Tourism Village with nine respondents classified as Key Players and the remaining one respondent is a stakeholder classified as Subject.
Keywords: readiness, potential, tourism village
Implementation of Coding Theory with The Extended Hamming Code in Steganography
Authors: Jannah Nurul , Hamid Nur 
Published: April 2024

Data security needs to be considered to avoid noise when sending data or data breaches by hackers. In this article, we implement data security using a combination of coding theory and steganography. The code used is an extended Hamming code [8.4]. The media used is a grayscale image of size of lengths 50,100,150,200,250 and 300 characters with 6 attempts. In addition, we show the PSNR result obtained and also the computation time.
Elementary students' mathematics learning activities and outcomes through the application of the problem solving method
Authors: Hartiningrum Esty Saraswati Nur , Agustin Nining Yuly , Umami Rohmatul 
Published: April 2024

Pada SDN Payaman, pembelajaran di kelas V masih terpusat pada guru, siswa kurang aktif, dan mengalami kesulitan dalam menyelesaikan soal cerita pada materi Satuan Kecepatan dan Debit. Tujuan dari penelitian ini melihat peningkatan aktivitas dan hasil belajar siswa kelas V SDN Payaman dengan diterapkannya media Roda Satuan dengan metode Problem Solving untuk membuat siswa lebih mudah memahami materi dan penyelesaian soal yang diberikan. Penelitian Tindakan ini dilakukan dalam 2 kali, dengan jumlah siswa kelas V sebanyak 34 siswa. Metode pengumpulan data dengan menggunakan observasi untuk melihat aktivitas siswa dan metode tes. Hasil penelitian menunjukkan terjadi peningkatan 24%. partisipasi siswa dari 64 % pada Tindakan I menjadi 80 % pada tindakan II, peningkatan hasil belajar siswa sebesar 41,2%, dari 44,1% pada tindakan I menjadi 85,3% pada Tindakan II. Adanya peningkaan yang terjadi menunjukkan penerapan Metode Problem Solving dengan Media Roda Satuan dapat digunakan guru untuk membuat situasi pembelajaran menjadi lebih antusias dan siswa lebih aktif dalam proses penyelesaian soal. Hasil belajar siswa juga telah memenuhi kriteria ketuntasan klasikal.
At SDN Payaman, the learning activities in class V are still predominantly teacher-centered, with students being less active and facing difficulties in solving story problems related to the topics of Speed and Discharge Units. This study aimed to see an increase in activity and learning outcomes for fifth-grade students at SDN Payaman by implementing the Roda Unit media with the Problem-Solving method to make it easier for students to understand the material and solve the problems given. This class action research was carried out in 2 times, with 34 students in class V. The data collection method uses observation to see student activities and test methods. The results showed an increase of 24 %. Student participation from 64 % in action I to 80 % in action II increased student learning outcomes by 41.2 %, from 44.1% in action I to 85.3% in action II. The increase shows that the teacher can use the Problem Solving Method with Unit Wheel Media to make the learning situation more enthusiastic and students more active in problem-solving. Student learning outcomes have also fulfilled the classical completeness criteria.
Optimisation of the Design of an Underwater Floating Transport Structure
Authors: Demidov I. M. , Poliakov V. Yu. 
Published: April 2024

The article considers the optimisation of internal forces from constant loads of the underwater floating transport structure to reduce the local effects of internal forces.This new type of structures can be used at significant depths of intersected water obstacles. Such structures will be in demand for the construction of underwater crossings as part of transcontinental transport corridors such as North – South, Japan – Europe and others.The purpose of the proposed study is to optimise the design to solve the problem of overloads of structural elements. To solve this problem, methods of structural mechanics and numerical experiment using the finite element method were used. Optimisation makes it possible to reduce bending moments in the zones of the edge effect when using a radial fastening scheme by several times. This will allow the use of unified sections of the structure.The article substantiates optimisation methods and their verification using the finite element method. The article also discusses the problems of system survivability of a structure in the event of failure of one or two anchorages. Bending moments increase significantly, but the traffic could be continued since the load from the train and the sum of constant loads have opposite signs.
On the Relationship of Torsional Vibrations and Breakdown Torque of Marine Diesel Engines
Authors: Popov D. A. , Epifanov V. S. , Zyabrov V. A. 
Published: April 2024

The article provides an overview of the conditions necessitating the calculation of torsional vibrations and disturbing moments relevant for their calculation as for marine diesel engines followed by an analysis of the effect of torsional vibrations on the breakdown torque of the engine. The forces arising in the crank mechanism of the engine due to torsional vibrations are illustrated by a diagram. Formulas are suggested for calculating the breakdown torque caused by torsional vibrations of the crankshaft of a multi-cylinder engine and the total breakdown torque. It is recommended to consider the influence of moments caused by torsional vibration on the unevenness of rotation and vibration of the engine.The results of calculation of the total torque of the engine previously performed by group of researchers, considering the influence of torsional vibrations, are quoted for DGR A 100/750 diesel generator with an effective power of 100 kW at a nominal speed of 750 rpm with a 6L 18/22 engine.Based on the results of the analysis, suggestions are given on the need to consider the moments arising from torsional vibrations when diagnosing the engine.
Optimisation of Timber Supply Chains: Mathematical Model and Analysis of Regional Sources Using the Example of Primorsky Region
Authors: Rogulin R. S. 
Published: April 2024

Optimising the supply of raw materials is closely related to the problems that arise at wood processing plants. Assessing the optimality of solutions often becomes a pressing issue.The article considers the scenario of a forestry plant without its own sources of raw materials, such as loggers, which seeks to find an optimal solution at the final stage of planning, based on data on previous transactions. A commodity exchange is considered as a source of raw materials, where lots appear daily in various regions of logging enterprises in a random order.The scientific sources offer multiple methods for calculating optimal profit throughout the entire planning period, but these approaches do not consider many important features of forest processing enterprises.This paper presents a mathematical model that allows estimating the optimal path for profit values throughout the entire planning period. A distinctive feature of the model is that it takes into account the share of the useful volume of raw materials that can be used in production of oriented strand boards after being delivered to the warehouse, as well as the delivery time of lots under conditions of uncertainty.After testing on data from the Russian Mercantile Exchange and one of Primorsky region enterprises, the model was applied to calculate the optimal profit trajectory for various data, including volumes of raw materials, time of lot delivery and other important production indicators, such as profit volume and volume of goods produced. Analysis of the results revealed difficulties in planning supply chains and production volumes. Regions as sources of raw materials were analysed, and it was determined from which regions and at what point it is worth purchasing raw materials. The article discusses in detail the disadvantages and advantages of the mathematical model.
Analysis of Mustard and Sunflower oil available in local market of Baglung Bazaar
Authors: Budhathoki Narendra , Punmagar Mira 
Published: April 2024

Two types of oil, including mustard oil and sunflower oil, were gathered for the study from the Baglung bazaar. Five separate physical-chemical characteristics, including moisture content, saponification value, acid value/free fatty acid, iodine value, and peroxide value, were determined. Consumer opinions were collected through a structured questionnaire on these edible oils. The physicochemical data were compared to the normative values advised by the Department of Food Technology and Quality Control (DFTQC), Babarmahal, Kathmandu, Nepal. For mustard oil and sunflower oil, the moisture content was found to be 0.24% and 0.38% respectively, which was greater than the standard value of 0.20%. The saponification value was found to be 157.64 mg KOH/g for mustard oil and 164.37 mg KOH/g for sunflower oil. For mustard oil and sunflower oil, the range of the acid value was 2.24 mg KOH/g and 3.36 mg KOH/g respectively. The iodine values of mustard oil and sunflower oil were found to be 107.95 and 125.60 g /100 g respectively. Finally, the peroxide values for mustard oil and sunflower oil were found to be 4 and 6 meq/kg respectively. Except for moisture content, the other parameters fell within permitted values. The study's findings indicate that all of the oil samples are of acceptable grade and are safe for consumption by humans.
L.V. Pustovalov and the Development of His Ideas on Oil and Gas Lithology
Authors: Kuznetsov V. G. , Dmitrievsky A. N. 
Published: April 2024

The article discusses the main directions of lithological research in the field of oil and gas geology, continuing and developing the ideas and research of L.V. Pustovalov. A number of such areas are closely coordinated with other branches of geology – tectonics, stratigraphy, etc. A wide range of such studies includes the analysis of the structure and development of sedimentary basins, the elucidation of the structure of the internal structure of sedimentary complexes, the forecast and search for non-structural traps of oil and gas, the study of natural reservoirs of oil and gas at different hierarchical levels.
DNA-Phenotyping of Remains from Elite Burials in the South of Russia in the Khazar Period
Authors: Fesenko D. O. , Aramova O. Yu. , Vdovchenkov E. V. , Ivanovsky I. D. , Fesenko O. E. , Polyakov S. A. , Faleeva T. G. , Filippova M. A. , Florinskaya V. S. , Kornienko I. V. 
Published: April 2024

The study of the past through the analysis of ancient DNA allows us to solve scientific problems related to the genogeographic origin and patterns of population migration. The Khazar Khaganate is a subject of controversy among scientists in various fields of science: its complex historical formation, the lack of a sufficient number of artistic and written sources, together with the disappearance of representatives of the Khazar culture, leaves open the question of the appearance of the Khazars. In this work, DNA-phenotyping of bone remains from the elite burials of the South of Russia of the Khazar period was carried out on the basis of the color of eyes, hair, skin, and blood groups according to the AB0 system. It was established that 8 out of 10 buried had brown eyes, dark hair (to varying degrees), and predominantly dark skin during their lifetime. People from two burials had gray-blue eyes, and one person had blond hair. In 8 individuals, the most probable blood type was established according to the AB0 system: 5 people had 0 (I) group, 4 people had A (II) group and one B (III). Assessment of allele distribution of ten autosomal markers with population specificity indicates high heterogeneity of ethnogeographic origin of the studied Khazars. The obtained results are evidence of the ethnocultural, genetic and phenotypic diversity of the Khazar Khaganate.
Interaction of DNA Methyltransferase Dnmt3a with Phosphorus Analogues of <i>S</i>-Adenosylmethionine and <i>S</i>-Adenosylhomocysteine
Authors: Filonov V. L. , Khomutov M. A. , Sergeev A. V. , Khandazhinskaya A. L. , Kochetkov S. N. , Gromova E. S. , Khomutov A. R. 
Published: April 2024

Enzymatic methylatransferase reactions are of crucial importance for cellular metabolism, and S-adenosyl-L-methionine is the main donor of the methyl group. DNA, RNA, proteins, and low-molecular-weight compounds are the substrates of methyltransferases. In mammals, methylation of the C5 position of cytosine residues in CpG sequences in DNA is performed de novo by DNA methyltransferase Dnmt3a. “Methylation pattern” is one of the factors determining the epigenetic regulation of gene expression. In the present work, we investigated the interaction of phosphonous and phosphonic analogues of S-adenosyl-L-methionine and S-adenosyl-L-homocysteine with the catalytic domain of Dnmt3a. The phosphonous and phosphonic analogs of S-adenosyl-L-methionine were shown to be substrates of Dnmt3a, and the efficiency of the methylation was only two times less than that of natural S-adenosyl-L-methionine. Both phosphorus-containing analogs of S- adenosyl-L-homocysteine, a natural methyltransferase inhibitor, exhibited similar inhibitory activity against Dnmt3a and were approximately four times less active than S-adenosyl-L-homocysteine. The activities of the phosphonous and phosphonic analogs turned out to be close that was quite unexpected, since the geometry and charge of the phosphorus-containing groups differ significantly. The possibilities of using phosphorus-containing analogs of S- adenosyl-L- methionine and S-adenosyl-L-homocysteine as promising tools for the investigation of methyltransferases are discussed.
Efficiency of <i>Escherichia coli</i> and <i>Bacillus subtilis</i> Expression Systems for Production of Binase Mutants
Authors: Nadyrova A. I. , Kosnyrev A. S. , Ulyanova V. V. , Dudkina E. V. , Vershinina V. I. , Ilinskaya O. N. 
Published: April 2024

Bacillus pumilus ribonuclease (binase) exhibits cytotoxic and oncolytic properties, while at high concentrations it causes genotoxic effects. The use of mutants with reduced catalytic activity preserving the antitumor properties of the native enzyme could reduce the toxic side effects of the enzyme. Here, mutant forms of binase with Lys26Ala and His101Glu single substitutions were obtained by site-directed mutagenesis. A comparative analysis of Escherichia coli and Bacillus subtilis-based expression systems demonstrated the feasibility of using a bacilli-based heterologous system for production binase mutants. Binase mutants with reduced catalytic activity were isolated and purified with ion exchange chromatography in a homogeneous state with 25 mg/L yield. The catalytic properties of obtained mutants toward natural RNA-substrates in comparison with those for native binase were analyzed. The catalytic activity of the Lys26Ala and His101Glu mutants was 11 and 0.02%, respectively. It was found that the Lys26Ala mutant as well as the native binase exhibits selective cytotoxicity toward A549, BT-20 and HuTu 80 tumor cell lines, without causing toxic effects toward normal WI-38 cells. The mutant His101Glu did not exhibit cytotoxicity.
Revision of Permosialidae (Insecta: Palaeomanteida) from Uppermost Lower and Lower Middle Permian of European Russia
Authors: Aristov D. S. , Rasnitsyn A. P. 
Published: April 2024

Generic and species composition of Permosialidae (Insecta: Palaeomanteida) from the uppermost Lower and lower Middle Permian of European Russia is discussed. Permosialis defurcata Martynova, 1952, P. brevifurcata Martynova, 1952, P. bifasciata Martynov, 1933, P. cauleoides Martynova, 1952, P. marmorata Martynova, 1952, P. immaculata Martynova, 1952 and P. fasciata Martynova, 1952 (all from the Lower Kazanian deposits of Soyana in Arkhangelsk Region) are synonymized under P. paucinervis Martynov, 1928 from the coeval deposits of Tikhie Gory in Tatarstan. Permosialis quadriramosa Martynova, 1952 from Soyana is synonymized under Palaeomantopsis furcatella Martynov, 1928 from Tikhie Gory. Palaeomantopsis furcatella, Permosialis paucinervis, P. perfecta Martynova, 1952, and P. latiformis Martynova, 1952 (the latter two from Soyana) are redescribed. Permosialis vizzya sp. nov. from Upper Kungurian of Vorgashor coal field and P. martynovae sp. nov. from Soyana are described as new.
Transfer and Accumulation of Biophilic Elements in Pasture Ecosystems of the Northern Caspian
Authors: Kulakova N. Yu. , Suvorov G. G. 
Published: April 2024

The scale and consequences of the transfer of biophilic elements from pasture ecosystems to sheep farms in the clayey semidesert of the Northern Caspian Sea region under the method of pastoralism accepted in the region (on the example of Stepnovsky settlement of Pallasovsky district of Volgograd region) were estimated. For the calculations, we used data on the chemical composition of dominant plants and sheep faeces, the long-term average productivity of phytocenoses, information on the rate of consumption of pasture forage by animals, etc. Soils of pastures and the reserve area, and soils on the sheep farm (in sheep corrals and in their resting places) were investigated. At least 17 t C, 600 kg Ca, 260 kg N, 100 kg Mg, 50 kg K, 40 kg P and 1 kg S were transferred to farms (0.1% of the area) from 1 ha of pasture (15% of the area) during the 6 months grazing season. The long-term stocks of faeces on farms (more than 1 thousand t in the example under consideration) are practically excluded from the circulation in the landscape. Small areas of farm soils are enriched with C, N, P and K. Compared with soils of the protected area, stocks of water soluble K increase (in the 0–30 cm layer) by two orders of magnitude, exchangeable K increases by 12–16 times, C by 8 times, N by 3 times, mobile P by 2 times. In grassland meadow-chestnut soils a decrease in the content of C (1.3 times) and exchangeable forms of K (1.6 times) relative to soils of the reserve area, in solonets on pastures decrease in the concentration of elements is not noted. The absence of statistically significant differences in the stocks of biophilic elements between the pasture soils and the soils of the protected area is partially explained by an increase in soil density by 0.08 g/cm3 in the 0–50 cm layer of the pasture soils. With the existing farming method, it is necessary to control the balance of biophilic elements in pasture soils.
Soil Microbiome in the Impact Zone of the Pechenganikel Plant Emissions (Murmansk Region)
Authors: Korneykova M. V. , Nikitin D. A. 
Published: April 2024

The microbial parameters in Albic Podzol soil were analyzed along the pollution gradient (3, 16, 30, 50 km) with Pechenganickel plant emissions (Murmansk region). The amount and structure of the prokaryotes and fungi biomass were assessed by the method of luminescent microscopy; the content of microorganism’s ribosomal genes copies was determined by real-time PCR; the taxonomic diversity and abundance of culturable soil microfungi were studied. An increase in the number of genes copies of bacteria, archaea, and fungi close the source of emissions compared to remote areas was revealed. In all plots, the highest number of ribosomal genes copies was found for bacteria (from 3.21 × 1010 to 12 × 1010 per g of soil). For fungi and archaea, the number varied from 0.53 × 1010 to 1.59 × 1010 per g of soil and from 0.55 × 1010 to 11.41 × 1010 gene copies/g of soil, respectively. A significant increase in the actinomycetes biomass close the plant was noted, while the biomass of bacteria and fungi remained practically unchanged at different distances from the emission source. Mycelium and fungal spores in all areas are mainly represented by small forms with a diameter of 2–3 microns. The length of the fungal mycelium varied from 51.2 m/g near the plant to 397 m/g in remote areas, with no regularities in its distribution along the contamination gradient. A decrease in the diversity of soil microfungi at the level of genera and higher taxa along the pollution gradient with plant emissions was noted. A change in the structure of communities from polydominant (background site) to monodominant (near the plant) was revealed. The species Penicillium raistrickii dominated in all plots. Fungi Trichoderma viride, dark-colored yeasts Torula lucifuga (3 km) and Aureobasidium pullulans (16 km) also dominated in the zone 16 km from the emission source. In the background area, representatives of the orders Mucorales and Umbelopsidales were dominant.
Phosphorus Sorption by Saline Soils of Western Transbaikalia
Authors: Sosorova S. B. , Merkusheva M. G. , Boloneva L. N. , Lavrentieva I. N. 
Published: April 2024

The sorption of phosphorus by salt marshes of the dry-steppe zone of the Republic of Buryatia from an aqueous solution of KN2PO4 in the concentration range from 0.25 to 5.0 mM/L (mmol/L) was studied under static conditions. The interaction time is 24 hours with a soil: solution ratio of 1 : 10. The amount of sorbed phosphorus was calculated from the difference in its content in the initial solutions and in the filtrates of soil suspensions. Based on experimental data, phosphorus adsorption isotherms were constructed by soil and sorption parameters were calculated using the Langmuir and Freundlich equations. Typical and quasi-clay Solonchaks have relatively high sorption properties with respect to phosphorus. The value of the maximum adsorption capacity (Amax) in the humus horizons of these soils varied in the range of 23.04–42.74 mM P/kg, in the underlying horizons 16.26–30.39 mM P/kg. In general, all soils, with the exception of the sorov Solonchaks, had an Amax value in the range of 17.70–42.74 mM P/kg. A low sorption value of phosphorus was found in the Solonchaks of sorovy. The Langmuir adsorption constant (KL) varied in the range of 0.3–14.0 l/mmol. Solonchaks dark and typical most strongly bind phosphorus. The Freundlich coefficient (KF) in the studied soils varied in the humus horizon from 5.34 to 63.43 mM P/kg, in mineral from 1.74 to 22.68 mM P/kg. The distribution coefficient (Kd) ranged from 1.95–145.04 l/kg with high values for quasi-clay Solonchaks and low for sorov Solonchaks. The correlation between Kd and Amax was estimated as average (r = 0.51), Kd and KL – high (r = 0.84, p ≤ 0.05). The studied soils according to the values of SPR (the amount of phosphorus that must be sorbed by the soil to maintain a concentration of P = 0.2 mg/kg (0.0065 mM/l) in soil solution) from (0.0723 to 3.4836 mM/kg) refer to weakly absorbing phosphorus. According to the ability to sorb phosphorus, soils form the following decreasing series: quasi-glay solonchaks typical solonchaks dark solonchaks glay solonchaks alluvial light humus saline sorov solonchaks.