bluuebunny/crossref_metadata_2025 huggingface dataset:
Isolation and screening producing growth regulator cyanobacteria strains
Authors: Thi Oanh Doan , Thi Thuy Duong , Thi Thu Lien Nguyen , Thi Mai Anh Dang , Thi Quynh Hoang , Minh Thang Hoang , Thi Nguyet Vu , Phuong Quynh Le Thi
Published: November 2020

Cyanobacteria are photosynthetic microorganisms that have their biosynthesis capacities for secondary compounds with the high application value. They can produce a variety of bioactive compounds such as lipopeptides, fatty acids, toxins, carotenoids, vitamins and plant growth regulators which could be released into the culture medium. The present study aimed to isolate and screen cyanobacteria strains that could synthesize phytohormone, indole-3-acetic acid (IAA) from paddy soild and fresh water ecosystems (canals, river). Soil and water samples were collected from diferent provinces (Bac Giang, Thanh Hoa and Hue). Indole-3-acetic acid was extracted from the culture of isolated cyanobacteria strains and identified using the Salkowski method. As a result, total 10 strains belonging to 4 genera including Nostoc, Anabena, Geitlerinema and Planktothricoides were susscessful isolated from river, canal and rice field. The morphology of isolated taxa was characterized and monoalgal cultures were grown in BG 11 medium. In L-tryptophan-enriched growth media, all cyanobacteria strains in this research were able to biosynthesize growth regulators with IAA concentrations ranging from 9.1 to 95 µg/mL. Among the isolated cyanobacteria strains, the Planktothricoides raciborskii showed potential for the production of IAA even in the absence of tryptophan in the culture medium. Research results of the L-tryptophan concentration effect on the ability of IAA biosynthesis of this cyanobacteria strain showed that IAA concentration increased gradually and reached the highest value (118,28 ± 2,00 µg/mL) when supplementing L- tryptophan in culture medium at 900 µg/mL. The capacity of producing IAA makes these isolated cyanobacteria  an appopriate cadidate for agricultural biotechnology.
Study of UGT1A1*28 genetic polymorphism related to irinotecan response in Kinh Vietnamese
Authors: Hai Ha Nguyen , Thi Thanh Hoa Nguyen , Binh Giang Vu , Phuong Nhung Vu , Thi Thu Yen Hoang , Dang Ton Nguyen , Thi Nhu Quynh Bach
Published: November 2020

Irinotecan is a medicine commonly used to treat cancer. Carboxylesterase converts irinotecan into SN-38, a substance with 100 times more cytotoxicity than the original compound. SN-38 is inactivated by glucuronidation in the liver to the inactive form of SN-38 glucuronidation. UGT1A1 is the main enzyme responsible for the glucuronidation SN-38 secretion. Neutropenia and diarrhea are dose-limiting toxicity of the drug. UG1A1*28 variant is believed to increase the risk of neutropenia and is closely related to the risk of severe diarrhea. In this study, we used the direct sequencing method of the promoter UGT1A1 gene to determine the genotype and allele frequency of UGT1A1*28 in 95 individuals of healthy Kinh Vietnamese . The results showed that UGT1A1*28 variant is present in homozygousand heterozygous genotypes with frequencies of 14.74% and 1.05%, respectively. The allele frequency of the UGT1A1*28 variant was 8.421% which was small compared with the wild type allele *1 (91.579%). The data obtained from the study contribute to an effective cancer treatment solution using the drug irinotecan.
Enhanced bioremediation of crude oil polluted water by a hydrocarbon-degrading Bacillus strain immobilized on polyurethane foam
Authors: Thi Quynh Hoa Kieu , Vu Giang Nguyen , Thi Yen Nguyen , Duc Huynh Mai , Huu Dat Nguyen , Thi Nga Vuong , Thi Thu Ha Nguyen , Thi Phuong Pham
Published: November 2020

During the production and transportation of petroleum hydrocarbons, unsuitable operation and leakage may result in contamination of water and soil with petroleum hydrocarbons. Petroleum contamination causes significant marine environmental impacts and presents substantial hazards to human health. Bioremediation of contaminated water and soil is currently the effective and least harmful method of removing petroleum hydrocarbons from the environment. To improve the survival and retention of the bioremediation agents in the contaminated sites, microbial cells must be immobilized. It was demonstrated that immobilized microbial cells present advantages for degrading petroleum hydrocarbon pollutants compared to free suspended cells. In this study, the ability of a Bacillus strain (designed as Bacillus sp. VTVK15) to immobilize on PUF and to degrade crude oil was investigated.  The immobilized Bacilllus strain had the highest number (5.38 ± 0.12 Í 108 CFU/g PUF) and a maximum attachment efficiency of 92% on PUF after 8 days. Analysis by GC-MS revealed that both free and immobilized cells of Bacillus sp. VTVK15 were able to degrade 65 and 90% of the hydrocarbons in 2% (v/v) crude oil tested after 14 days, respectively. The results suggest the potential of using PUF-immobilized Bacillus sp. VTVK15 to bioremediate petroleum hydrocarbons in an open marine environment.
Nutrient status of wheat growing soils in Meerut district of Uttar Pradesh
Authors: Tiwari Rakesh , Tiwari Prabha Shankar , Singh Ashok
Published: November 2020

A study was conducted on nutrient status of wheat growing soils in district Meerut Uttar Pradesh. The study was conducted in soil testing laboratory of Krishi Vigyan Kendra Meerut and soils were collected from farmer’s field in the year 2017-18 and 2018-19. The analysis of soil samples shows that most of the soils of Meerut district are low to medium in organic carbon (0.41%), low in available nitrogen (210 kg/ha), medium in available phosphorus (13.55 kg/ha) and potash (195 kg/ha) and there is a need for a close monitoring of nutrient management and application of the fertilizer recommendations on the basic of STB (soil testing based) to enhance the wheat productivity.
Effect of moisture stress on physiological mechanisms in drought tolerance in selected genotypes of groundnut (Arachis hypogaea L.)
Authors: Patil H.Y. , Pooja  , Chimmad V.P.
Published: November 2020

Eight groundnut genotypes of including four released and pre-released genotypes were evaluated for moisture stress at pegging (M2) and pod development (M3) stage stress situations with control (M1) during post-rainy season (Nov-April), 2018-19 at University of Agricultural Sciences, Dharwad and Karnataka, India. The drought stress was imposed by with holding irrigation at 40-80 DAS (M2) and 80 DAS-harvest (M3). Observations were recorded for physiological parameters like leaf area, SPAD readings, chlorophyll content, stomatal frequency, photosynthetic rate and pod yield per plant. Among the selected genotypes, GPBD-4, Dh-257 and Dh-256 are considered as drought tolerant genotypes at both the stress levels based on lesser reduction in leaf area, optimum chlorophyll content and photosynthetic rate, less leaf folding and by these adaptations recorded reduced reduction in pod yield over control. Genotypes, Dh-86 and TMV-2 affected severely by drought at both the stages. But higher effect was observed under pod developmental stage stress.
Spice crops tolerant to salinity and alkalinity
Authors: Kumar Sanjay , Sharma Parmod , Kumar Narender , Rana Mahesh Kumar
Published: November 2020

Tolerance and yield of a crop are complex genetic traits, which are difficult to maintain simultaneously since salt stress may occur as a catastrophic agent, be imposed continuously or intermittently or become gradually more severe. Salinity and alkalinity stress have a major impact on spices in the form of their growth, development and yield.Adverse effects of salinity might be due to ion cytotoxicity and osmatic stress, which disrupt homeostasis in water potential and ionic distribution due to disordering in cohesions of membrane lipids and proteins and influence various physiological and biochemical processes. To review the tolerance of spices to salinity and alkalinity, the present paper collates the existing experimental data sets, establishing the salt tolerance limits under saline or alkali environment either in soil root zone or which is created due to the application of saline or alkali irrigation water for crop production. Studies show that the salt affected areas and saline irrigation water can be utilized satisfactorily to raise forest and fruit tree species, forage grasses, conventional and non-conventional crops, oil seed crops, spice crops of high economic value, petro-crops and flower plants.
Effect of seed coating on seed quality and yield of soybean [Glycine max (L.) Merrill]
Authors: Kalpande H.V. , Chavan P.S. , Borgaonkar S.B. , Bagade A.B.
Published: November 2020

An investigation on effect of seed coating on seed quality and yield of soybean [Glycine max (L).Merrill] was conducted during Kharif 2018 at Instructional Farm, Department of Agriculture Botany, Vasantrao Naik Marathwada Agriculture University, Parbhani. The experiment was laid out inRandomized BlockDesign with three replications and seven treatments viz., T1-Untreated seeds,T2-Polymer coating, T3-T2+Vitavax, T4-T3+GA3 100ppm, T5-T3+CCC 100ppm, T6-T3+, NAA 50ppm, T7- T3+IAA 50ppm. The experiment was conducted to study effect of different seed coating treatments such as seed on quality and yield of soybean. From the present investigation it was observed that T4 (T3+GA3) 100ppm followed by T6- (T3+, NAA50ppm) and T7 - (T3+IAA) 50ppm, recorded higher seed quality and yield contributing traits. Mean days for 50 per cent flowering and mean days to harvest found non-significant. Treatment T4- (T3+GA3 100ppm) found superior in increasing plant height over treatment T5- (T3+CCC100ppm).In treatment T4-(T3+GA3) 100ppm was found superior for number of branches, leaf area content, chlorophyll content, number of pods per plant, number of seed per pod. Yield per plot and per ha., test weight, harvest index followed by treatments T6- (T3+NAA50ppm) and T7-(T3+IAA 50ppm than all other seed coating treatments over the control. Biochemical studies found that, oil content and protein content higher in T7-(T3+IAA50ppm) followed by treatments T6-(T3+,NAA50ppm) and T5-(T3+CCC100ppm) than all other coating treatments over the control. Seed germination (%), seed moisture (%), plant total dry weight, was significantly in treatment T4- (T3 + GA3100ppm) followed by treatments T6-(T3+ NAA50ppm) and T7-(T3+IAA50ppm) than all other seed coating treatments over the untreated seed.
Identification and tagging of QTLs for arjunolic acid in Terminalia arjuna among Indian sub populations by association mapping and linkage disequilibrium
Authors: Bharti Sonu
Published: November 2020

The content of cardiotonic arjunolic acid in Terminalia arjuna vary among the population. We studied the population structure and the association between the molecular markers and its active ingredient among 140 plants collected from various agroclimatic zones in India. Large variation was detected for the arjunolic acid in this study showing suitableness of the genotypes. The maximum arjunolic acid content was approximately 238 per cent higher than the lowest value for the genotypes and was found to be considerably correlated to bark thickness, bark fresh weight and bark dry weight. The population structure studies described the existence of nine subpopulations. As the distance increased between the associated markers, Linkage disequilibrium (LD) reduction and a considerable reduction in LD decay was ascertained. Eleven QTL regions associated with arjunolic acid were identified from a genome-wide marker-trait association study. Fine-scale resolution detected significant LD among 3.4 per cent RAPD paired loci and 8.7 per cent ISSR paired loci and 6.7 per cent RAPD paired loci and 13.3 per cent ISSR paired loci. Importantly LD decay found to start at a distance of >20bp from the loci on the genome of T. arjuna accessions. Finally, association mapping (AM) in arjun tightly linked to OPT09 which can be a possible substitute to QTL mapping methodology.
Mechanized system rice intensification (MSRI) in rice cultivation at Visakhapatnam district of Andhra Pradesh
Authors: Rao K. Tejeswara , Kumar P. B. Pradeep , Chandrayudu E.
Published: November 2020

Paddy is major predominant crop during kharif in Visakhapatnam district of Andhra Pradesh, cultivated in an area of 102074 ha, out of total cropped area of 180164 ha with productivity of 2524 kg/ha. Farmers grow crop by adopting traditional method of paddy cultivation, use more seed rate, close spacing, late transplanting with over aged seedlings common phenomenon due to erotic rainfall Scarcity of labour and escalation in labour wages, reduction in labor efficiency are leading to low net returns. Organized On Farm Trials (OFTs) in farmer fields in two seasons Kharif, 2018 and Kharif, 2019. MSRI technology in paddy recorded 20.76% yield over normal transplanting method of paddy cultivation during both Kharif seasons. The results from the study showed that the farmers realized additional net income of Rs.15038 due to increased grain yield by 20.76% with reduction of cost of
Assessment of chilli genotypes for anthracnose resistance under field conditions
Authors: Arjun K. , Arumugam T. , Karthikeyan M. , Devi H. Usha Nandhini , Mohankumar S.
Published: November 2020

Anthracnose caused by complex of Colletotrichum species is an economically important disease of chilli. The study involved 132 genotypes grown under field conditions. Among the genotypes evaluated, fifteen genotypes were moderately resistant to anthracnose with fairly high yield. In the order of merit, the genotypes were CA 177 (10.74%), Paramakudi 1 (16.64%), F 507 (17.17%), Bird’s eye chilli (17.85%), Kadaladi 1 (19.70%), Ramnad local (20.64%), CO 1 (20.82%), TA/CA/ 10 (21.56%), CA 166 (21.94%), CA 188 (22.29%), Paramakudi 2 (22.45%), CA 13/6 (23.42%), Chilli CO hybrid 1 (24.36%), IC 342465 (24.68%) and CA 165 (25.70%). whereas, 40 genotypes were susceptible with PDI ranging from 26.30 to 50.69 per cent and majority of the genotypes (77nos) were found to be highly susceptible to anthracnose with per cent disease index ranging from 51.81 to 96.42 per cent. The moderately resistant genotypes identified in the present investigation will serve as donors or source of resistance for anthracnose.
Cytological and anatomical assessment of a few planting materials of tea (Camellia spp.)
Authors: Burhagohain Alija , Gogoi Aditi Smith
Published: November 2020

In the present investigation, an effort was made to characterize and estimate the variation of 20 tea germplasm on the basis of cytological and anatomical characteristics. All the germplasm showed highly significant difference amongst them in all the parameters except the ploidy level. Here, all the germplasm were observed to be diploid having 2n=30 no. of chromosome. From the anatomical parameters it was observed that THT8 followed by THT5, THT7, THT13 showed characteristic more likely towards Cambod type also recorded with higher phloem index. The planting material noted with higher phloem index in the present study can be considered as hybrid population which may be a good parent material for breeding programme.
Study on induced mutations in m1 generation in sorghum [Sorghum bicolor (L.) Moench ]
Authors: Surashe S.M. , Kalpande H.V. , Borgaonkar S.B.
Published: November 2020

An investigation was carried out to create the variability generated through induced mutation in two sorghum populations viz., 296 B (Kharif) and Parbhani Moti (Rabi). Two mutagens viz., gamma irradiation (10 kR, 20kR, 30kR and 40kR) and EMS (0.1%EMS, 0.2%EMS, 0.3%EMS and 0.3%EMS) and their combination were used M1 generation. Mutagenic sensitivity in M1 generation on the basis of reduced germination and plant survival revealed a dose dependent reaction and differential response of the populations. LD50 was found to be 20-30 kR in case of gamma irradiation and 0.3-0.4 per cent in EMS irrespective of the genotype. The irradiated population produced more number of superior segregants in respects of seed yield and its contributing traits compared to other populations. Three dwarf mutant, one brown midrib and tree drought tolerance confirmed from Parbhani Moti.
Integrated management of bacterial wilt of ginger incited by Ralstonia solanacearum
Authors: Singh Roop
Published: November 2020

An experiment was conducted to find out the integrated management of Ralstonia solanacearum infecting ginger. Two antibiotics, two biocontrol agents, one phytoextract and one organic amendment and their combination were used. The average reduction in pre emergence seed rot and post emergence seedling mortality recorded with all the treatments tested were ranged from 16.50 to 80.39 per cent over untreated. However, significantly highest reduction in average preemergence seed rot and post- emergence seedling mortality was recorded with streptocycline + P. fluorescens (80.39%). This was followed by streptocycline + karanj cake (72.31%), streptocycline + T. viride (69.55%), streptocycline (58.68%), karanj cake + A. sativum (48.49%), P. fluorescens (44.94%), karanj cake (36.79%). Whereas, T. viride, A. sativum and gentamycin were found least effective with comparatively minimum reduction in average mortality, 26.94, 20.94 and 16.50 per cent, respectively. Of the treatments tested, significantly highest root length (8.60 cm), shoot length (18.43 cm) and vigour index (2342.69) were recorded with streptocycline + P. fluorescens.
Coronavirosis: signos y síntomas con un enfoque en SARS CoV-2. Una revisión comparativa entre especies.
Authors: Yañez Esparza A. , Ortuño Sahagún D.
Published: November 2020

La enfermedad de la COVID-19 afecta a humanos y es causada por el coronavirus SARS CoV-2.  Es una afección emergente que se caracteriza por causar fiebre, malestar, fatiga, dificultad respiratoria, tos seca, diarrea y dolor de cabeza; en los casos más graves puede ocasionar neumonía severa, ocasionalmente conjuntivitis y erupciones cutáneas. Recientemente se ha demostrado que SARS CoV- 2 es capaz de infectar otras especies y estas pueden presentar signos similares a los de COVID-19. Esta revisión hace una comparación de los signos y síntomas de las coronavirosis que afectan a las principales especies domésticas. Adicionalmente, presenta una recopilación de reportes zoosanitarios y trabajos experimentales de la susceptibilidad de animales ante la infección de SARS CoV-2, ya sea por contacto con personas positivas a SARS CoV-2 o por inoculación experimental. Finalmente, se comparan los signos en animales con los síntomas de la enfermedad de la COVID-19 y se demuestra que los animales filogenéticamente más cercanos al humano fueron también los más susceptibles.La enfermedad de la COVID-19 afecta a humanos y es causada por el coronavirus SARS CoV-2.  Es una   afección emergente que se caracteriza por causar fiebre, malestar, fatiga, dificultad respiratoria, tos seca, diarrea y dolor de cabeza,; en los casos más graves puede ocasionar neumonía severa, ocasionalmente conjuntivitis y erupciones cutáneas. Recientemente se ha demostrado que SARS CoV- 2 es capaz de infectar otras especies y estas pueden presentar signos similares a los de COVID-19. Esta revisión hace una comparación de los signos y síntomas de las coronavirosis que afectan a las principales especies domésticas. Adicionalmente, presenta una recopilación de reportes zoosanitarios y trabajos experimentales de la susceptibilidad de animales ante la infección de SARS CoV-2, ya sea por contacto con personas positivas a SARS CoV-2 o por inoculación experimental. Finalmente, se comparan los signos en animales con los síntomas de la enfermedad de la COVID-19 y se demostró que los animales filogenéticamente más cercanos al humano fueron también los más susceptibles.
Varietal Evaluation and Clustering of Early Maize Genotypes in Mid-Western Hilly Region of Nepal
Authors: KANDEL Bishnu Prasad
Published: November 2020

Eleven early maize (Zea mays) genotypes were evaluated for their yield and yield component traits at the research block of Regional Agriculture Research Station (RARS) Lumle, Kaski, Nepal during Kharif season of 2016. The experiment was laid out in randomized complete block design (RCBD) with three replications. Results showed that all the studied genotypes differed significantly for grain yield as well as other yield component traits except number of kernel per row. Out of tested genotypes COMPOZ-NIPB, EEYC1, POP-445/POP-446 were three top performer genotypes yielding 6.89, 5.38 and 5.19 t ha-1. Early mid Katamari, Rajahar local, Manakamana-5, EEYC1 were statistically at par with Arun-4(standard check) and will be needed further evaluation and improvement by a selection of desirable traits. Eleven genotypes occupied three different clusters and showed that early maize genotypes suggest considerable genetic diversity among themselves. Genotypes belong to cluster one having the highest yield potentials so need to be further evaluation in different location of mid hill and recommended best variety for that domain.
Application of the Biolog® Identification System for Aflatoxin-Producing Fungi Associated with Maize (Zea mays L.) Contamination in Romania
Authors: SMEU Irina , CUCU Elena Mirela , DOBRE Alina Alexandra , CASIAN Hellene
Published: November 2020

Cereals are very susceptible to fungal attacks. Fungi have a unique biochemical pathway to assimilate a vast array of available substrates and produce toxic secondary metabolites, such as mycotoxins, which represent a clear public health concern. In this context, a maize survey was conducted in order to assess the diversity of mycotoxin-producing fungi. Low levels of total aflatoxins, acceptable by the European Union, were detected in maize samples. A semi-automated Biolog® Microbial Identification System was used for the identification of the fungal strains. Enzyme-linked immunosorbent assay (ELISA) was used for the quantification of total aflatoxins. The results indicated that Fusarium udum and Rhizopus oryzae were the prevalent fungi for the assessed maize samples, while both control and treated samples showed low levels of total aflatoxins, which did not exceed 1.5 μg kg-1. The registered total aflatoxin concentrations were consistent with the European regulations.
Alternaria Genus and the Diseases Caused to Agricultural and Horticultural Plants
Authors: FLOREA Antonia , PUIA Carmen
Published: November 2020

This work is a bibliographic approach to the historical and most recent taxonomy on Alternaria genus. The genus Alternaria consists largely of species of saprophytic, endophytic and parasitic fungi. The United States Fungal host index ranks the genus Alternaria on the 10th place based on the number of host plants, with over 4,000 species. Govind et al. (2016) tells us that most species of this genus are missing the sexual form, with the exception of a few species, which have, in addition to the anamorphic form, the telemorphic form. With the discovery of several species and due to the superficiality of past research, the inclusion of this genus in the taxonomy has become problematic. At the beginning, the taxonomic classification was performed according to the morphology of the species. This bibliographic approach wants to clarify some of the aspects concerning the old and actual taxonomy ambiguities of Alternaria genus. The method used is consulting the scientific literature. The present reclassification of the species was performed by analysing the DNA of each species in 2013 by Woudenberg et al. and fit the Alternaria species in 25 sections. In 2016 Lawrence et al. added 2 other sections and in 2019 Ghafri et al. forms a new section based on the new species Alternaria omanensis. In conclusion Alternaria genus is now divided in 28 sections, each section contains species that are genetically related. Even though most of the ambiguities have been clarified at present, there are still ambiguities regarding the species within and between sections.
STUDY OF THE EFFECT OF TiB2 PARTICLES ON THE STRUCTURE, DEFORMATION BEHAVIOR, AND PROPERTIES OF THE ALUMINUM ALLOY 1550
Authors:   Tomsk State University (Tomsk, Russian Federation), VOROZHTSOV Aleksandr B. , PLATOV Vladimir V. ,   Tomsk State University (Tomsk, Russian Federation), KOZULIN Aleksandr A. ,   Tomsk State University (Tomsk, Russian Federation), KHRUSTALEV Anton P. ,   Tomsk State University (Tomsk, Russian Federation), MISHIN Ivan P. ,   Institute of Strength Physics and Materials Science of SB RAS, ZHUKOV Il’ya A. ,   Tomsk State University (Tomsk, Russian Federation)
Published: November 2020

In this work, the special master alloys containing aluminum and TiB2 powder with bimodal particle size distribution in three mixture compositions are prepared. The master alloys are infused into the melts using an external ultrasound source. The castings with particles had smaller grain sizes than the initial castings without particles. It is found that the hardness, yield strength, and ultimate tensile strength reach higher values with an increase in the relative elongation of the cast alloys with added particles. A warm rolling mode is employed for the studied alloys to obtain sheet blanks. It is shown that the staged shrinkage of the billets up to deformation of 80 % with periodic heating up to 300 °C allows one to obtain defect-free sheet products. The structure of the rolled sheet-alloys is characterized by the plate-shaped grains elongated along the rolling direction with pockets of submicron-sized grains in between. The strength properties of the studied rolled alloys exceeded those of the cast alloys. In the case of the rolled alloys, an increase in the yield strength, ultimate tensile strength, and ductility is revealed for the alloys with particles as compared to the ones with no particles added.
EXPERIMENTAL INVESTIGATION OF THE STRUCTURE, ELASTIC, AND STRENGTH CHARACTERISTICS OF POROUS CORUNDUM CERAMICS
Authors:   Institute of Strength Physics and Materials Science of SB RAS, ZIMINA Valentina A. ,   National Research Tomsk State University
Published: November 2020

This paper aims to investigate the internal structure and to evaluate the elastic and strength characteristics of the corundum ceramic samples sintered at different temperatures. The average value of porosity of the sintered samples at the temperatures of 1400, 1500, and 1600 °C is 33, 26, and 17%, respectively. Mechanical tests of the ceramic samples are performed using the threepoint bending method. The ultimate bending strength varies from 135 to 265 MPa in the studied sintering temperature range. The elastic moduli of the sintered samples are found to be in the range of 58 – 113 GPa. An analysis of the ceramic samples’ microstructure is performed using a scanning electron microscope. The dependence of the porosity, pore size, and grain size on the sintering temperature is indicated. The values of strength and elastic modulus of the samples increase nonlinearly with rising sintering temperature in the experiment. Statistical behavior of mechanical properties of the ceramic samples is described using the Weibull analysis. The strength data for the sintering temperatures of 1500 and 1600 °C are well described by the Weibull distribution, and the strength values for a sintering temperature of 1400 °C are described with a significant scatter.
STUDY OF THE HYDRATE FORMATION IN A PIPELINE WITH INSULATION COATING DURING GAS TRANSFER FROM THE “DOME-SEPARATOR”
Authors:   Ufa State Petroleum Technological University (Ufa, Russian Federation), CHIGLINTSEVA Angelina S. , NASYROV Azat A. ,   Bashkir State University (Birsk branch, Birsk, Russian Federation), CHIGLINTSEV Igor’ A. ,   Bashkir State University (Birsk branch, Birsk, Russian Federation), LEPIKHIN Sergey A. ,   Industrial University of Tyumen, Surgut branch (Surgut, Russian Federation), KOLEDIN Viktor V. ,   South Ural State University, Nizhnevartovsk branch (Nizhnevartovsk, Russian Federation)
Published: November 2020

The paper proposes a mathematical model describing the process of the hydrate formation in a vertical pipeline through which the gas is transported from the dome-separator designed to eliminate a technogenic spill of oil from the well at the seabed. If the dome is located in the zone of stable hydrate existence, then hydrate deposits can form within and in the pipeline, which can lead to the pipeline clogging. The influence of the presence of a pipeline insulation coating, which consists of the layers of polyurethane and polyurethane foam, and its thickness on the hydrate formation process in a steel pipeline is studied on the basis of numerical modeling. It is shown that if the gas is derived from the dome located at a depth of 1500 m, the zone of hydrate deposits is formed at the inlet of the pipeline without insulation (in the dome-separator vicinity). When the thermal insulation of the pipeline is used, it leads to an upward shift of the hydrate formation conditions. As a result, depending on the thickness of the insulation coating, the zone of hydrate deposits is formed near the outlet of the pipeline (in the ocean surface vicinity) or no hydrates are formed in the pipe. It is also shown that the motion of the seawater around the pipeline has almost no effect on the process of hydrate formation within the pipe.
INVESTIGATION OF SOME CLASSES OF SECOND ORDER PARTIAL INTEGRO-DIFFERENTIAL EQUATIONS WITH A POWERLOGARITHMIC SINGULARITY IN THE KERNEL
Authors:   Tajik National University (Dushanbe, Republic of Tajikistan), ZARIFZODA Sarvar K. , ODINAEV Raim N. ,   Tajik National University (Dushanbe, Republic of Tajikistan)
Published: November 2020

For a class of second-order partial integro-differential equations with a power singularity and logarithmic singularity in the kernel, integral representations of the solution manifold in terms of arbitrary constants are obtained in the class of functions vanishing with a certain asymptotic behavior. Although the kernel of the given equation is not a Fredholm type kernel, the solution of the studied equation in a class of vanishing functions is found in an explicit form. We represent a second-order integro-differential equation as a product of two first-order integro-differential operators. For these one-dimensional integro-differential operators, in the cases when the roots of the corresponding characteristic equations are real and different, real and equal and complex and conjugate, the inverse operators are found. It is found that the presence of power singularity and logarithmic singularity in the kernel affects the number of arbitrary constants in the general solution. This number, depending on the roots of the corresponding characteristic equations, can reach nine. Also, the cases when the given integro-differential equation has a unique solution are found. The correctness of the obtained results with the help of the detailed solutions of concrete examples are shown. The method of solving the given problem can be used for solving model and nonmodel integro-differential equations with a higher order power singularity and logarithmic singularity in the kernel.
ON PROJECTIVELY INERT SUBGROUPS OF COMPLETELY DECOMPOSABLE FINITE RANK GROUPS
Authors:   Tomsk State University (Tomsk, Russian Federation), CHEKHLOV Andrey R. , IVANETS Olesya V. ,   Tomsk State University (Tomsk, Russian Federation)
Published: November 2020

Let a group G be a finite direct sum of torsion-free rank 1 groups Gi. It is proved that every projectively inert subgroup of G is commensurate with a fully invariant subgroup if and only if all Gi are not divisible by any prime number p, and for different subgroups Gi and Gj their types are either equal or incomparable.
STUDY OF THE TRANSPARENT ARMOR STRENGTH UNDER A HIGH-SPEED IMPACT OF A CYLINDRICAL IMPACTOR BY COMPUTER MODELING METHOD
Authors:   Tomsk State University (Tomsk, Russian Federation), BELOV Nikolay N. , YUGOV Nikolay T. ,   Tomsk State University (Tomsk, Russian Federation), SAMMEL Anton Yu. ,   Tomsk State University (Tomsk, Russian Federation), STEPANOV Evgeniy Yu. ,   Tomsk State University (Tomsk, Russian Federation)
Published: November 2020

When manufacturing transparent multilayer armor of high threat level, the reinforced silicate glass and transparent ceramics with protecting back films are usually used. The hardness of the front layer of the shield should be much higher than that of the impactor. A promising option is the use of a single leucosapphire crystal. However, due to its high cost and the impossibility of providing large-sized samples, the transparent polycrystalline materials are developed. One of the most advanced materials is ALON, which is close to leucosapphire in strength characteristics. The aim of this work is to develop a mathematical model to calculate the impact interaction of fragmentation elements with transparent armor. The numerical study is carried out using proprietary software systems. Calculations of the high-speed impact of the steel cylindrical impactor are implemented for three types of shields made of transparent armor. The first two-layer target is made of 20 mm thick tempered glass and a 4 mm thick polycarbonate layer. The second and third targets are three-layered. The front layer of the second target is made of ALON, and the spinel is used for the third one. The second and third layers in these targets are made of tempered glass and polycarbonate, respectively. The calculated results show that ALON is the most impact-resistant material, while spinel is a little less resistant.
INVESTIGATION OF A HYDRODYNAMIC ENTRANCE REGION FOR A POWER-LAW FLUID FLOW IN A ROUND PIPE
Authors:   Tomsk State University (Tomsk, Russian Federation), BORZENKO Evgeniy I. , GARBUZOV Dmitriy N. ,   Tomsk State University (Tomsk, Russian Federation)
Published: November 2020

The paper presents a study of the Ostwald – de Waele fluid flow in a round pipe with a uniform velocity profile specified at the inlet section. Mathematical formulation of the problem is presented using dimensionless variables. A numerical algorithm is developed on the basis of the finite volume method and SIMPLE procedure. Parametric studies of the flow are carried out for the Reynolds number varying from 0.1 to 80 and the power-law index varying from 0.2 to 1.5. It is shown that the flow can be distinguished into a developing flow zone in the inlet boundary vicinity and a fully developed flow zone in the rest part of the flow region. Dependency diagrams are plotted for the development length depending on the power-law index and Reynolds number. The first diagram is found to be non-monotonic. The development length is shown to be almost linearly dependent on the Reynolds number in the range from 1 to 80. In the region of low Reynolds numbers, the length remains almost uniform. The agreement of the obtained numerical results with data from other studies is shown.
STUDY OF THE PASTE-LIKE PROPELLANT COMBUSTION AT VARIOUS LOADING SCHEMES
Authors:   Tomsk State University (Tomsk, Russian Federation), BURKIN Viktor V. , D’YACHKOVSKIY Aleksey S. ,   Tomsk State University (Tomsk, Russian Federation), ISHCHENKO Aleksandr N. ,   Tomsk State University (Tomsk, Russian Federation), KASIMOV Vladimir Z. ,   Tomsk State University (Tomsk, Russian Federation), ROGAEV Konstantin S. ,   Tomsk State University (Tomsk, Russian Federation), SAMOROKOV Nina M. ,   Institute of High Current Electronics SB RAS
Published: November 2020

The experimental and theoretical studies of the paste-like propellant combustion in a model ballistic installation are implemented. The research is carried out using three masses of projectile assemblies and three types of the propellant charge. The paper presents two versions of the law of dispersion for paste-like propellants which allow accounting for the pressure on the front and acceleration of the projectile assembly with a traveling charge. The coefficients in the laws of dispersion are obtained. Using the mathematical model presented in this work, the gas-dynamic pictures of the shots when the propellants are applied as traveling charges are obtained for each dispersion law. Based on the results, a detailed study of the processes occurring with the traveling charge consisting of a model paste-like propellant is implemented for various shot arrangements. The discrepancy between theoretical results and the results obtained in the set of experiments is no more than 2% for the maximum pressure and no more than 1% for the muzzle velocity. The dispersion law accounting for the projectile assembly acceleration and traveling charge makes it possible to describe accurately the processes in the space behind the projectile for projectile assemblies of various masses and different types of granulated powder charge in terms of the model ballistic installation in the considered pressure range.
Essays and Short Stories From Nikolai Naumov’s Collection Strength Breaks the Straw in the Context of the Tchaikovtsy Ideas
Authors:   Tomsk State University (Tomsk, Russian Federation), Przhigotskiy Vladislav A.
Published: November 2020

The collection Strength Breaks the Straw, published in St. Petersburg in 1874 by the Circle of Tchaikovsky, marked the heyday of the literary work of Nikolai Ivanovich Naumov, a Siberian writer and official. The works of this collection were originally published in leading democratic journals of this period and later entered the pantheon of populist fiction and won the attention of many contemporaries and researchers in the future. A relevant aspect in the study of Naumov’s creative heritage of the first half of the 1870s, i.e. the mentioned collection, is the understanding of the mutual influence of the various social fields he was engaged in during these years sequentially or in parallel and, accordingly, of his various institutional activities closely connected with literary ones, in particular, with the aesthetics and poetics of the collection. The article explores the mechanisms of influence of these various social fields on Naumov’s literary activities during this period. It reveals the poetic and aesthetic features of the works of the collection caused by the historical and literary trends, by the ideological influence of populism, and by Naumov’s own tasks as a Siberian writer and official. The analysis showed that the features of the works are caused not only by the main trends of populist ideology and fiction, but also by the tasks that Naumov tried to solve in the course of his institutional activities. His works of the first half of the 1870s, which the Tchaikovtsy used to spread their ideology, aimed at satisfying the demands of the mass reader and also at creating his “ideal” reader, which regionalists sought from Naumov. The exceptional documentary nature creating a “reality effect” and directly related to the author’s ubiquitous voice permeating the structure of each essay was a means for Naumov to form the reader’s reception, primarily that of a reader from people and from Siberia. On the other hand, the documentary nature of Naumov’s essays is caused not only by the trends associated with the flourishing of realism and the search for means of transmission of the truth of life in fiction, but also by the writer’s previous public service, which provided him with rich factual material and influenced the nature of its presentation in literature. This mutual influence was largely supported by the fact that, in the considered period, Naumov occupied homologous positions in various social fields.
Manuscript Books in the Nobility Libraries of the Urals in the 18th Century
Authors:   Russian State Vocational Pedagogical University (Yekaterinburg, Russian Federation), Pirogova Elena P.
Published: November 2020

The article discusses the phenomenon of the late manuscript book as part of the three largest libraries of the Ural industrial noblemen of the 18th century. Based on new sources (property inventories, statements, and other documentary materials of the preserved manuscripts unique to the region), the reasons for the existence of manuscript books in the noble environment of the Urals are considered. The author examines the composition of the books, determines their thematic sections, original and translated literature, and compares the manuscript book composition of libraries of different owners and representatives of different generations of the Ural industrialists. The author concludes that the latter had increased readership demands and lacked the necessary printed publications, which was one of the reasons for the distribution of manuscript books in the Ural province. The manuscript collections had distinguishing features and books unusual for typical nobility libraries, which can be explained by the transitive type of the Ural industrial nobility: they did not break their “tribal” ties with the democratic environment from which they emerged. Being noble only in the first or second generation, they strove to conform to the noble fashion for enlightenment, spared no means to complete their libraries, filling the shortage of printed publications with orders for translations and manuscript copies of books. The introduction of new sources into scientific discourse will give a new impetus to the study of the culturally and historically significant and yet insufficiently studied phenomenon of the late manuscript book in Russia and in the Urals.
Books in the History of the Ideological and Creative Self-Determination of the Russian Enlightener Yakov Abramov (Based on Archival Research). Article 2. Social and Philosophical Ideas of European Enlighteners and Socialists in the Reading Reception of Yakov Abramov in the Mid-1870s
Authors:   North Caucasus Federal University (Stavropol, Russian Federation), Golovko Vyacheslav M.
Published: November 2020

Yakov V. Abramov, a theorist and practitioner of the culturalist trend, held a special position in the camp of the reformist populism of the 1880s–1890s. He argued the idea of developing “small deeds” into “great deeds” and justified the need to enlighten people’s consciousness and to change the principle of modern society’s existence peacefully yet fundamentally. Defining his own self-actualisation strategy in socially beneficial activities, he purposefully formed his own circle of reading which reflects the breadth of his interests and represents his integrated approach to the development of scientific knowledge. The materials of archival research show that Abramov actualised the social and educational functions of literature, relating the progressive development of Russia to people’s exposure to education and culture, back in the period of the formation of his ideology and democratic positions. Abramov developed his worldview learning the ideas of European Enlightenment and the theories of utopian socialism. Extracts from the writings of Montesquieu, Charles Fourier, Ferdinand Lassalle, and Louis Blanc testify to the social orientation of the spiritual and moral quests of the future populist ideologist and his critical attitude to the existing social system. While appreciating Montesquieu’s On the Spirit of the Laws as a product of intellectual activity, Abramov emphasised that not all Montesquieu’s ideas responded to the challenges of the new time and gave a clear preference to the works of modern European socialists. In the writings of Fourier, Lassalle, and Blanc, he found thoughts and ideas consonant with his thoughts about the domination of one class over the others established in the world, about the plight of the working masses not only in Russia, but also in other countries of the world. The problem of the “advantages of capital over labour”, the anti-human essence of the “open economy” and the laws of capitalist exploitation became objects of Abramov’s social analysis. In the writings of the utopian socialists, who argued for peaceful revolutions, one can see the genesis of Abramov’s philosophy of social evolutionism that proved the historical productivity of the peaceful “people’s movement forward” by means of developing education, culture, and economy in the name of a radical transformation of society and bringing humans to a higher level. Abramov’s surviving notebooks and diaries of the second half of the 1870s record a high level of sociophilosophical reflection, which largely determined the interpretation of the dialectic of “small and great deeds”, the practice of his real “work among the people”.
The Theory and Practice of Modern Prepress of University Publications
Authors:   Ural Federal University (Yekaterinburg, Russian Federation), Plotnikova Irina Yu. , Klimova Olga V. ,   Ural Federal University (Yekaterinburg, Russian Federation)
Published: November 2020

The organisation of the university educational process requires a high availability of educational and scientific literature, which implies the high quality of the preparation of educational and teaching aids, reference materials and scientific publications. However, one can note a change in the technologies of premedia and printing processes, optimisation of the activity of publishing offices and, as a result, a drop in the quality of published printed matter. In 2019 a quantitative analysis of preparation of conference materials for publication was conducted on the basis of the Ural University Publishing House. According to this analysis, one can argue that the quality of the publishing product depends on the ratio of prepress volumes and timelines, the quality of materials provided to the publishing house, the responsibility of the authors and members of the editorial board, their readiness to work within a short time period, etc. According to the documents, the editorial board ensures the quality of scientific publications, which in this case consists of four Grand PhDs and two PhDs; in fact, the quality of the content left much to be desired. Separately, the quality of preparation of the bibliographic apparatus should be noted. In this case, the editorial preparation of the bibliography was carried out by a library employee in an extremely limited time (two days). It was done in order to bring the bibliographic description to some uniformity—there was no discussion on compliance with All-Union State Standards 7.1.-2003 and 7.05-2008. There was also a shift of areas of responsibility when the preparation of separate elements of a scientific article (for example, the bibliographic description) is not planned in advance, but becomes spontaneous and, as a result, entails a partial reimposition of the manuscript. The priorities of the practical model of preparing a university publication have changed significantly. The publication of conference proceedings prioritises releasing the publication at a certain time (by the beginning of a scientific event), which jeopardises the quality of its prepress. When preparing a university publication in tight deadlines, functions are redistributed, and professional communication has its features: both the authors and the publishers do not have the necessary conditions for an effective interaction in order to prepare a high-quality scientific publication. Most definitions of a scientific and educational book emphasise its task, properties, functions, role as a means of communication of the professional community and a method of transmitting relevant information. It seems that a university publication, like no other, should prioritise the quality of prepress and, therefore, should be planned ahead.