bluuebunny/crossref_metadata_2025 huggingface dataset:
Characteristics, Diagnosis, Treatments and Public Awareness of Covid-19 Pandemic in Bangladesh: Mathematical Analysis
Authors: Hoque Ashabul , Malek Abdul , Asif Zaman KM Rukhsad
Published: January 2022

Background: The situation of Covid-19 in Bangladesh is analysed using a mathematical model.

Objective: The objective of this study was the mathematical analysis and statistics of Covid-19 in Bangladesh which originates with reliable and perfect forecasts of the outbreak.

Methodology: The Runge- Kutta method was applied to calculate the variables of the system of equations of the SEIRD compartmental model which was developed based on the SEIR model. Data of Covid-19 pandemic in Bangladesh were analyzed from March 08 to December 07, 2020.

Results: The cumulative infection rate was used in the model to obtain the best fit with the available data. The statistics of Covid-19 in Bangladesh showed that the highest numbers of infections and deaths were observed in the 4th month (end of June) from the reported date those were consistent with other countries. We had also derived a reproduction number, Rt for each day so that the model’s result closely replicates the daily number of recently infected cases. Furthermore, the infected and death rate were observed highest among the age group of 31-40 and 61-above, respectively.

Conclusion: This study contributes to a better understanding about the control policies of the Covid-19 pandemic in Bangladesh based on the estimated parameters of the proposed model and investigations of corona statistics.

Bangladesh Journal of Infectious Diseases June 2021;8(1):18-26
Anosmia with or without Ageusia as a Presenting Symptom in COVID-19 Positive Patients: A Single Center Study at Dhaka in Bangladesh
Authors: Akram Arifa , Rahman Khan Mohammad Jahidur , Rahman Md Ashiqur , Islam Md Raihanul , Ali Md Mahbub , Islam Toufiqul , Akram Lubana , Yusuf Md Abdullah , Islam Md Tanjimul , Reza Md Alimur
Published: January 2022

Background: The loss of smell and taste in COVID-19 patients is now acknowledged as one of the disease’s primary symptoms.

Objective: The aim of this study was to investigate the incidence of loss of smell and taste in outpatients and hospitalized patients with SARS-CoV-2 infection that RT-PCR had confirmed.

Methodology: This cross-sectional study was conducted in the in the Novus Molecular Lab, Dhaka between 5 June 2021 and 17 July 2021]. COVID-19 patients were included in this study who become RT-PCR positive in nasopharyngeal and oropharyngeal swabs in a single center. All of them were interviewed by a structured questionnaire over the phone.

Results: Among 200 COVID-19-positive patients smell and taste dysfunction appeared among 75(37.5%) patients. Only smell dysfunction occurred in 57.0% of patients, and taste dysfunction appears in 34.0% patients, and both symptoms were present among 9.0% of patients with or without other symptoms of COVID-19. The smell and taste recovery time was distributed as 63.0% recovered within less than a week, 20.0% within 2 weeks, and 17.0% in 2 weeks.

Conclusion: In conclusion significant number of COVID-19 patients are presented with loss of smell and taste.

Bangladesh Journal of Infectious Diseases June 2021;8(1):32-35
Evidence Based Management of COVID-19 - Bangladesh Perspective
Authors: Kabir Md Asadul
Published: February 2022

Abstract not available
J MEDICINE 2022; 23: 1-2
Clinical Consequences and Economic Burden Associated with Febrile Neutropenia in Hospitalized Cancer Patients: A Prospective Study
Authors: Bahar Tamanna , Rahman Shaila , Chowdhury Zulfia Zinat , Kabir Tania , Akther Fahmida , Haque Salina , Islam AKM Mynul , Ali Mohammad , Rahman Md Mahbubur
Published: February 2022

Objective: Febrile neutropenia (FN) is viewed as the most decimating oncological crisis particularly inchemotherapy-incited patients. The primary objective of the study was to identify the total directexpenditure of patients during febrile neutropenia with clinical consequences and the secondary aim wasto find out the factors associated with higher cost.
Materials and Method: This was a single-centered hospital-based study in the largest and only specializedcancer care centre in Bangladesh in the government sector. This prospective study was done in theinpatients’ department of the National Institute of Cancer Research and Hospital from April 2020 toJanuary 2021. The primary outcome was the out-of-pocket patient payments (adjusted by governmentsubsidy) per FN episode. Univariate analysis and multiple linear regression were conducted to identifythe factors associated with higher costs.
Results and Discussions: A total of 101 patients were enrolled in the study. The mean (SD) age was33.49 (±15.79) years. Of the 101 participants, 63.4% were male. Among the patients, 13.9% died during theepisode and 86.1% recovered. Having co-morbidities and COVID-19 were associated with an increasedrisk of death. The mean cost was US$ 999.44 (±499.05) and the mean length of hospital stay was 21.98(±9.3) days. The longer hospital stay was significantly associated with higher costs.
Conclusion: This study will help to ascertain the hospital cost and clinical outcome of FN whichultimately can help in policymaking strategy.
J MEDICINE 2022; 23: 48-53
PENENTUAN KONSTANTA PEGAS MENGGUNAKAN APLIKASI PHYPHOX PADA PERISTIWA OSILASI PEGAS
Authors: Ewar Herliana Ariyanti , Bahagia Marselina Erisna , Jeluna Valeria , Astro Richardo Barry , Nasar Adrianus
Published: January 2022

Penelitian ini bertujuan untuk menentukan nilai konstanta pegas pada peristiwa osilasi pegas. Penelitian dilakukan  melalui  eksperimen menggunakan aplikasi phyphox menu spring pada smartphone. Pengumpulan data dilakukan secara manual dan elektronik pada smartphone data yang diperoleh berupa massa, pertambahan panjang pegas, periode dan frekuensi. Analisis data menggunakan persamaan regresi linear. Hasil penelitian menunjukan  nilai konstanta pegas 1 sebesar 7,424 N/m 0,00092, nilai konstanta pegas 2 sebesar 11,084 N/m 0,00078, dan nilai konstanta pegas 3 sebesar N/m0,0016.
Pengembangan Laboratorium Virtual Berbasis Website di Kelas X Teknik Komputer dan Jaringan (TKJ)
Authors: Riska Dara , Mayub Afrizal , Medriati Rosane
Published: January 2022

ABSTRAK Penelitian ini bertujuan untuk mendeskripsikan pengembangkan dan kelayakan media pembelajaran laboratorium virtual berbasis website pada materi suhu dan kalor kelas X TKJ SMKN 3 Kota Bengkulu. Penelitian ini merupakan penelitian dan pengembangan (R & D) dengan metode 4D namun hanya sampai pada tahap 3D. Proses pengembangan terdiri dari tahap pendefinisian atau define, perancangan atau design, dan pengembangan atau develop. Hasil validasi menunjukkan bahwa media pembelajaran laboratorium virtual berbasis website ini dikategorikan sangat layak digunakan dengan kriteria  87,5%. Persentase tersebut merupakan rata-rata dari aspek format = 85,41% dengan kriteria sangat layak; aspek ilustrasi = 86,1% dengan kriteria sangat layak; aspek bahasa = 85,41% dengan kriteria sangat layak; dan aspek isi = 91,67% dengan kriteria  sangat layak. Dengan demikian dapat disimpulkan bahwa media pembelajaran laboratorium virtual berbasis website pada materi suhu dan kalor memenuhi kriteria dengan kualitas sangat layak sebagai salah satu media pembelajaran yang digunakan peserta didik kelas X SMKN 3 Kota Bengkulu. Kata kunci: Pengembangan, laboratorium virtual, website, suhu dan kalor ABSTRACT The purpose of this research was to described development and appropriateness of virtual laboratory learning method based on website on temperature and heat theory class X TKJ SMKN 3 Kota Bengkulu. This research was research and developing ( R & D ) with 4D method has been modified to 3D. Development process consist of definiton phase or define, design phase or design,  and development or develope. Validation result indicated this virtual laboratory learning method based on website categorized very appropriate to use with criteria 87,5 %. That percentage was average from format aspect = 85,41% with criteria very appropriate; illustration aspect = 86,1% with criteria very appropriate; language aspect = 85,41% with criteria very appropriate; and content aspect = 91,67% with criteria very appropriate. Therefore can be concluded that virtual laboratory learning method based on website on temperature and heat theory fulfilled the criteria with very appropriate qualityas one of the learning method used by student class X TKJ SMKN 3 Kota Bengkulu. Keyword: Development, virtual laboratories, websites, temperature and heat
ANALISIS VALIDASI MEDIA PEMBELAJARAN E-BOOK BERBASIS FLIP PDF PROFESSIONAL PADA MATERI GELOMBANG BUNYI DI SMA
Authors: Andani Tiya
Published: January 2022

ABSTRAK Penelitian ini dilakukan dengan tujuan untuk menghasilkan media E-book berbasis Flip PDF Professional yang layak digunakan sebagai media pembelajaran pada materi gelombang bunyi kelas XI SMA. Penelitian yang dilakukan merupakan penelitian Research and Development (R&D) dengan pendekatan 4-D yang meliputi tahap pendefinisian (define), tahap perancangan (design), tahap pengembangan (develop) dan tahap penyebaran (disseminate). Pada penelitian ini hanya dibatasi pada tahap pengembangan saja dikarenakan adanya keterbatasan waktu. Analisis data yang dilakukan pada penelitian ini adalah berdasarkan hasil skor penilaian uji kelayakan media E-book yang telah diberikan oleh validator ahli materi dan validator ahli media. Dari hasil skor penilaian uji kelayakan ahli materi diperoleh hasil sebesar 4,47 dari skor maksimum 5 atau sebesar 83% dengan kategori sangat layak. Sedangkan  hasil skor penilaian uji kelayakan ahli media diperoleh hasil sebesar 4,73 dari skor maksimum 5 atau sebesar 90% dengan kategori sangat layak. Berdasarkan hasil penelitian ini dapat disimpulkan bahwa media E-book berbasis Flip PDF Professional pada materi gelombang bunyi sangat layak digunakan sebagai salah satu alternatif media pembelajaran.Kata Kunci— Media Pembelajaran, E-Book, Flip PDF Profesional, Gelombang BunyiABSTRACT This research was conducted with the aim of producing an E-book based on Flip PDF Professional which is suitable for use as a learning medium for sound wave material for class XI SMA. The research conducted is a Research and Development (R&D) research with a 4-D approach which includes the definition stage, the design stage, the development stage and the dissemination stage. In this study, it was only limited to the development stage due to time constraints. The data analysis carried out in this study was based on the results of the E-book media feasibility test assessment scores that had been given by material expert validators and media expert validators. From the results of the assessment score of the material expert's feasibility test, the results obtained were 4.47 from a maximum score of 5 or 83% in the very feasible category. While the results of the assessment score of the media expert's feasibility test obtained a result of 4.73 from a maximum score of 5 or 90% with a very feasible category. Based on the results of this study, it can be concluded that the E-book media based on Flip PDF Professional on sound wave material is very feasible to be used as an alternative learning media.Keywords— Learning Media, E-Book, Professional PDF Flip, Sound Wave
TEKNIK ASTOPHOTOGRAFI DALAM PENENTUAN POLA AKHIR SENJA (HILANGNYA MEGA MERAH) SEBAGAI AWAL MASUKNYA WAKTU ISYA DENGAN IMAGE PROCESSING
Authors: Septianto Arif
Published: January 2022

Penggunaan  drone dalam teknik astofotografi menjadi solusi atas permasalahan pengukuran kecerlangan langit  untuk mengetahui hilangnya waktu  syafaq mengunakan SQM yang dinilai kurang efisien. Pada kasus menentukan awal waktu isya ditandai dengan hilangnya mega merah (syafaq) pada langit sebelah barat saat malam hari. Dalam peneitian pengukuran citra langit peneliti menggunakan teknologi drone sebagai sensor image. Data foto yang diambil pada penelitian ini diambil dalam rentang 15 sekon/ capture. Data yang didapat tidak dapat langsung di gunakan karna masih terdpat noise. Karnanya perlu dihilangkan terlebih dahulu dengan metode image processing agar data tersebut dapat terlihat jelas dan mudah direpresentasikan oleh mata manusia atau komputer yang sifatnya deterministik. Metode pengolahan data pada penelitian ini menggunakan Microsoft excel dan MATLAB dengan persamaan polynomial 5 untuk memplot grafik kecerahan langit. Hasil pada penelitian ini menunjukan bahwa waktu hilangnya syafaq berbeda- beda pada setiap harinya. Waktu paling awal hilangnya syafaq terjadi pada pukul 18:38:18 dan waktu paling akhir terjadi pada pukul 18:59:19
Stunting Management Monitoring System
Authors: Jannah Helmi Roichatul , Kusumadewi Sri , Fitriyanto Raden Edi
Published: February 2022

Stunting is one of the chronic nutritional problems in which the length or height of children is shorter than normal children their age. In the short term, stunting can interfere with brain and physical development, while in the long term, stunting can reduce a person's cognitive abilities and intelligence, as well as being susceptible to various diseases. Stunting cannot be cured, but it can be optimized for growth and development during the 1000 first days (first day of life) by routinely carrying out examinations. This is the goal of this study, namely to build a system that can monitor the health of pregnant women and toddlers aged 0-24 months in an effort to optimize the growth and development of stunting children. Stunting management monitoring system is carried out based on certain nutritional status management which indicates the birth of a child experiencing stunting. The system is built in the form of a website, where expert rules related to the management of nutritional status are translated into the system using the Rule Based Reasoning method. To measure the success of the system, usability testing or functional testing by users is carried out with the attributes of testing the ease of use of the system and the ease of the system to learn. Overall, the Stunting management monitoring system can accommodate the early stages of health monitoring in 1000 first days, however, development will continue in line with user needs.
Identifikasi Dan Uji Kandungan Metabolit Sekunder Tumbuhan Obat
Authors: Ridwan Ridwan , Kaharudin La Ode
Published: February 2022

Medicinal plants are an important, easily accessible resource for use as health care for rural communities. Medicinal plants are an important, easily accessible resource for use as health care for rural communities. The study uses plant samples that have been used by the people of North Buton as traditional medicine for generations. This study aims to determine the types of medicinal plants and the content of secondary metabolites contained in these plants. The research was carried out through several stages including: identification stage, then the secondary metabolite content test stage which was analyzed through several stages, namely extraction, flavonoid test, alkaloid test, steroid/terpenoid test, tannin test, saponin test and phenol test. The content of secondary metabolites was tested on three parts of plant organs, namely roots, stems and leaves. The results showed that the plants used were the species Embelia sp. and Tetracera indica (Christm. & panz. Merr.). Furthermore, the secondary metabolite test results showed that Embelia sp. contains alkaloids, flavonoids, terpenoids, tannins, and phenols. The roots, stems and leaves of Tetracera indica (Christm. & panz. Merr.) contain alkaloids, terpenoids, saponins, tannins, and phenols.
PKM PENDAMPINGAN PRODUKSI TAHU BERBASIS TEKNOLOGI DAN MANAJEMEN KEUANGAN DI SENTRA INDUSTRI TAHU NGLONGSOR, TRENGGALEK
Authors: Purwati Titik , Hindun Nurmala
Published: February 2022

Tofu is a nutrient-rich snack. Soy-based. One area that produces tofu is the Corah Mulyo, Nglongsor, Tugu, which is the Tofu Industry Center in Trenggalek Regency. As confectionary from simple and traditional industrial processed products, hygiene and waste disposal aspects are largely lacking in careful attention. Soybeans are ground into mush, boiled, filtered, quenched and dregs separated, the essence is boiled again, given liquid vinegar, clots, squeezed and printed. The remaining juice is a waste. The team of PKM P2M IKIP Budi Utomo Malang introduced the management of the production process that is efficient and free from waste and also provides an understanding of the financial governance of business results. With a different milling machine, soybeans are ground to produce essence and pulp. Boiled quintessence is given a liquid nautical juice, clots, squeezed and printed. The remaining juice can be used for making drinks, odorless and environmentally friendly. Methods and approaches through transformation and mentoring. End of activities, Team of PKM (1) Transform hygienic tofu production processes, (2) Ability to operate soybean grinding machines, (3) Socialize handling of production processes with sanitation and a clean work environment, (4) Understand the value of financial governance results business tofu.
Heavy metal speciation in natural waters of water bodies of the Moscow chanal and the Volga-Baltic system
Authors: Lipatnikova O. A. , Lubkova T. N.
Published: January 2022

In this paper the thermodynamic calculation of heavy metal speciation in waters of water reservoirs of the Moscow Canal and the Volga-Baltic system (the Uglich, the Rybinsk, the Sheksninsky, the Vytegorsky and the Belousovsky reservoirs and Lake Onega) is presented. It has been shown that Sr, Ba, Fe, Mn, Zn, Ni, Co, Cd are mainly presented in free ions, the main forms for Cu are fulvate complexes and for Pb are fulvate and carbonate complexes.
Evaluation of the depth of seasonal defrosting at change of thermal physical characteristics of bulk soils
Authors: Gnatyuk I. I. , Motenko R. G.
Published: January 2022

Western Siberia is an important base for oil and gas production. The main number of deposits are arranged on bulk soils that violate the thermal regime of rocks and cause the development of a variety of engineering and geological processes and phenomena. The paper presents the results of determining the thermophysical characteristics of bulk soils selected at four fields in Western Siberia. Thermotechnical calculations were carried out to determine the depth of seasonal thawing and an assessment was made of the influence of the thermophysical properties of bulk soils on the change in thickness of the seasonally thawed layer.
Fluorine in the mudvolcano waters of the Kerch-Taman region
Authors: Savenko A. V. , Bychkov A. Yu. , Poltavskaya S. V. , Savenko V. S.
Published: January 2022

Content of dissolved fluorides in the waters of 13 mud volcanoes of the Kerch-Taman region was determined: 0,13–2,00 mg/l with average value of 0,87 mg/l (n = 37). A fairly close correlation was established between the fluorine concentration and pH value (r = 0.80) in the absence of correlation with mineralization and content of components of the basic salt composition. It was suggested that the fluorine concentration in mud-volcano waters is controlled by the exchange reaction

 where  

et

 is content of adsorbed and structural fluorine (hydroxyl ions) in the clay minerals; F– et OH– is concentration of fluorides (hydroxyl ions) in the aqueous phase.
Assessment of the relationship between clay soils consistency and kinematic parameters of elastic waves
Authors: Shumkin E. A.
Published: January 2022

Assessment of the water-physical characteristics of soils by indirect geophysical indicators is simpler. Indirect indicators provide an opportunity to characterize various volumes of the researched environment. The article presents the results of determining the kinematic parameters of elastic waves of clay soils at different values of the liquidity index. In the transition from soils of very stiff consistency to soils with stiff and firm-stiff consistency, a correlation is observed between the ratio of the secondary, primary wave velocities, and the values of the liquidity index of clay soils.
Determination of seismic generation zones of Fennoscandia according to data of analysis of seismicity and computer geodynamic modelling
Authors: Sentsov A. A. , Agibalov A. O.
Published: January 2022

The work is devoted to the problem of identifying zones of seismic generstion zones of Fennoscandia, for the solution of which structural-geomorphological interpretation was carried out, seismicity analysis and computer modeling of the latest geodynamics were performed. According to the results of structural-geomorphological interpretation, the territory under consideration was divided into 6 large blocks. Computer modeling showed that each of them is characterized by a certain type of stress state in recent times, and also allowed us to calculate the probability of the formation of new short-distance faults. The reliability of the constructed models is evidenced by the established numerical correlation between this parameter and the density of earthquake epicenters. Based on the data on the density of earthquake epicenters and areas of the possible formation of new faults, a map of seismic generation zones of Fennoscandia was developed.
Structure and condition of formation of Campanian deposits of the North-Western Caucasus (Galitsyno section)
Authors: Yakovishina E. V. , Kopaevich L. F. , Nikishin A. M. , Freiman S. O. , Ustinova M. A.
Published: January 2022

The description of rocks in the Galitsyno quarry located in the Adler region of the North Caucasus is given. The quarry is interesting because the excellent exposure in a relatively homogeneous stratum of carbonate rocks was able to identify certain changes that reflect the events common to the Late Cretaceous, in this case, Late Campanian, interval of events. These include carbonate sedimentation characteristic of this geochronological interval, constant fluctuations of the relative sea level, and periodic manifestations of volcanic activity. All these features confirmed both by the structural features of the section, the presence of various lithological types of rocks in it, and by the features of the composition of the complexes of microorganisms. The use of different methods of analysis of the factual material makes the obtained conclusions convincing.
Composition of the ore-forming fluid and physicochemical parameters of ores formation of the Malmyzh Au-Cu-porphyry deposit on the example ore area Freedom (Far East, Russia)
Authors: Svistunov V. V. , Prokofiev V. Yu.
Published: January 2022

Fluid inclusions in quartz from one of the Au-Cu mineralization centers of the Malmyzh porphyry deposit’s — Freedom are studied. Established the chloride-predominant composition of fluid, that was formed Au-Cu mineralization of deposit. The main physical and chemistry characteristics of ore-forming fluid: temperature — 250–530 С, salts concentration — 0,8– 48,0 wt% NaCl eq., pressure — 15–62 MPa. Based on calculations of ore-formed fluids pressure concluded what ore formed on depth 1,5–2,4 km. The ore-bearing block moved up to 900 m during the ore-formation time. The results of study can be used in prospecting and exploration of gold-copper porphyry deposits.
Features of lithological modeling Neocomian clinoform hydrocarbon deposits of Western Siberia
Authors: Zakrevskiy K. E. , Nassonova N. V. , Kalmykov G. A.
Published: January 2022

Considers issues of three-dimensional geological modeling of gas and oil fields in Neocomian clinoform deposits of the Western Siberia. The features of the geology of the studied deposits, which are important for the creation of lithological models, are analyzed. The essential difference of lithological modeling methods of shelf and Achimov deposits is shown. Examples of building the lithological models taking into account the revealed features of geological structure are given.
Rock shale mineral composition influence on oil and gas generation process (results from laboratory experiments)
Authors: Kalmykov A. G. , Gafurova D. R. , Tikhonova M. S. , Vidishcheva O. N. , Ivanova D. A. , Manko I. E. , Korost D. V. , Bychkov A. Yu. , Kalmykov G. A.
Published: January 2022

The paper presents the results of the hydrothermal processes of organic matter transformation in the rocks of the Bazhenov Formation and the Domanik horizon laboratory modeling. Shortterm exposure of samples to high temperatures (350 C) and reservoir pressures (300 atm) in the presence of water made it possible to simulate the processes that could take place in the reservoir, and to transform kerogen up to 70% in the rocks initially containing immature kerogen or kerogen in the beginning of the oil window. It was found that the amount of liquid hydrocarbon compounds generated during cracking mainly linearly depends on the content of organic matter in the rocks, while the gas generation is described by a rate function. The mineral composition of rocks does not affect the size of the formed pores, but in some cases it controls the amount of formed hydrocarbon compounds and the composition of the liquid products. It is shown that the increase in the amount of carbonate material in the rocks inhibits oil and gas generation process, there are lower amounts of light components in the products, and some of hopanes are absent. At the same time, high concentrations of siliceous material in the rocks with low amount of other components and, probably, the presence of pyrite can stimulate the generation process, in some cases allowing an increase in the amount of produced “synthetic” oil and gas, to achieve a greater variety of reaction products. The results obtained in general make it possible to examine the processes of individual hydrocarbon compounds formation during hydrothermal processes, to identify catalysts and inhibitors of the generation mechanism, and also, from a practical point of view, to propose conditions for reservoirs stimulation and development of technologies for increasing oil production and generation of oil with a controlled composition in situ.
Morphology and defect-impurity composition of the Zapolyarnaya pipe diamonds
Authors: Vyatkin S. V. , Kriulina G. Y. , Garanin V. K. , Konogorova D. V. , Vasiliev E. A. , Samosorov G. G.
Published: January 2022

A representative collection of Zapolyarnaya pipe diamonds of the first batch of industrial production was studied by methods of morphological analysis, IR, FL, and EPR. Diamonds belong to the medium-low-nitrogen, they are the closest to the Daldyn-Alakit area diamonds in terms of their composition and ratios of impurity centers. Typomorphic features for diamonds of Zapolyarnaya pipe are the predominance of curved dodecahedroids, a significant degree of development of the processes of dissolution, etching and plastic deformation, close to the maximum content of IR defects B2, the minimum content of hydrogen, as well as a wide spread of paramagnetic centers W7.
Frost heave and frost susceptibility of soils on the projected railway Moscow–Kazan
Authors: Fattoev U. B. , Brouchkov A. V. , Koshurnikov A. V. , Gunar A. Yu.
Published: January 2022

Frost heave and factors which affect it are considered on the projected railway Moscow– Kazan. That region is intensively developed; however, frost heave hasn’t been well studied in there, especially at the present climatic conditions. Results of field studies of frost heave properties of grounds on monitoring sites along the railway Moscow–Kazan are presented; they include physical properties of grounds, depth of seasonal freezing, grounds thermal mode, groundwater dynamics, snow cover thickness and basic characteristics of frost heave.
Sequence stratigraphy of the Upper Vendian of the North-East of the Nepk-Botubinskaya anteclise of the Siberian platform (based on studyng boreholes core and Aliza gis)
Authors: Plyusnin A. V. , Kopaevich L. F.
Published: January 2022

The results of the analysis of core and logs of the upper vendian sediments (vilyuchansky, nepsky, tirsky and danilovsky horizons) of the northeast of the Nepa-Botuoba anteclise are presented. Regional sequence-stratigraphic analysis made it possible to identify six third-order sequences and stratigraphic unconformities confined to their boundaries. The systemic tracts are represented by proluvial, alluvial, lagoon and shallow-water-marine sediments, successively replacing each other, which is typical for the passive continental margin and the general subsidence of the Siberian platform in the vendian time.
Lithological and geochemical characteristics and paleoclimatic conditions of the origin of Upper Cretaceous deposits of the epicontinental basin of the Russian plate in the region of the Ulyanovsk-Saratov foredeep
Authors: Gabdullin R. R. , Puzik A. Yu. , Merenkova S. I. , Migranov I. R. , Badulina N. V. , Ivanov A. V. , Kazurov M. D.
Published: January 2022

The results of a geochemical study and paleogeographic, paleoclimatic interpretation for a cyclically constructed section of upper Cretaceous deposits near Volsk city, Saratov region, are presented. Elementary formation cyclites and cyclic variations of a number of certain parameters were associated with the Milankovich astronomical-climatic cycles. The curves of changes of paleotemperature, humidity, paleobathymetry were compiled. The results obtained give an idea of the migration of the arid belt boundaries in the upper Cretaceous and the overall climatic zonation, which is important for regional and global paleoclimatic reconstructions, as well as the history of the development of shelf seas that covered the Russian plate (especially Ulyanovsk-Saratov trough). Paleotemperatures of the land surface in the denudation areas are obtained from the chemical index of alteration (CIA). In the Turonian-Campanian interval selected climatic cyclicity, including period of relative cooling (Turonian–Coniacian) with paleotemperature about 20 °С, the period of relative warming in the mid-late Campanian (20–24 °С), the cooling time at the end of the late Campanian (19–21 °С) and the period of warming at the turn of the Campanian and Maastrichtian and in the early Maastrichtian time. In Maastrichtian age, there are two climatic cycles, beginning with a time of relative cooling (about 19 °С) and ending with a time of relative warming (about 20  С, at the end of Maastrichtian to 25 °С). The cycles of climate humidity change are also determined: two cycles in Campanian time, three cycles in early Maastrichtian, and one cycle in late Maastrichtian. The boundary of the early and late Maastrichtian corresponds to the change of arid conditions to humid ones. The paleobatimetry curves show transgressive-regressive cycles: one in the late Turonian-Coniacian time, two in the late Campanian time, five in the early Maastrichtian time, and one in the late Maastrichtian time. Depth variations were estimated: in the Turonian-Coniacian time in the range of 70–80 m, in the Campanian-Maastrichtian time, the paleobatimetry consistently increased and changed from 100 to 200 m (on average about 150 m). The results obtaired give and idea of the migration of the boundaries of the arid belt in the Late Creataceous and main features of the climatic zonation, which is important for regional and global paleoclimatic reconstructions, as well as for the history of the development the Russian plate in the Ulyanovsk-Saratov region.
New magnetotelluric data in the suture zone of Fennoscandia and Sarmatia
Authors: Kulikov V. A. , Ionicheva A. P. , Lubnina N. V. , Shustov N. L. , Yakovlev A. G.
Published: January 2022

Presents the results of magnetotelluric soundings acquired in 2020 along the profile Rzhev– Velikie Luki, in the suture zone of three parts of Precambrian crust of East European platform: Fennoscandia, Sarmatia and Volga–Ural. In the central part of the profile, anomaly zone of increased conductivity in the crust was revealed. The crust conductor is weakly expressed on the components of the telluric tensor due to the screening effect of the conductive sedimentary cover; therefore, the focus in the qualitative analysis of data and inversion was made on magnetovariational parameters.

According to the results of two–dimensional inversion carried out in the program of A.E. Kaminsky ZONDMT2D, on the geoelectric model a subvertical zone of low resistivity in the crust is identified, which is probably associated with the paleosubduction zone of the Belarusian Ocean Plate.
New data on Permian plants of the Pechora coal basin in context of plants and insects coevolution (The collection of the Earth Science Museum of Lomonosov Moscow State University)
Authors: Naugolnykh S. V. , Kirilishina E. M. , Isaev V. S.
Published: January 2022

The paper is devoted to new finds of the Middle Permian fossil plants, which are kept at the Earth Science Museum of the Lomonosov Moscow State University. The palaeobotanical collections of the museum became significantly enriched by the adding of these new specimens. Some attractive specimens having high scientific potentiality (for instance, equisetophytes Annulina neuburgiana (Radczenko) Neuburg and leptosporangiate ferns Pecopteris anthriscifolia (Goeppert) Zalessky) will be used as materials for exhibitions, and will be involved into educational projects of the museum. Discovery of the leaves of cycadophyte affinity allows to develop the idea on possible migration of the termophylic tropical elements into boreal vegetation of the Angara type.
Preliminary research on developing the methodology for predicting and estimation of productive sulfide mineralization of the Norilsk type using polarizing-optical and petrophysical methods (on the example of the Talnakh Deposit)
Authors: Boguslavskiy M. A. , Burmistrov A. A.
Published: January 2022

The quantity of the mineral composition of ore and parent rocks was carried out. Ore sections from the core samples of two wells of the Talnakh field were used for these studying. Also a number of their physical, mechanical, magnetic and electrical properties were determined. The content of the main ore minerals and useful components in the studied samples were calculated due to comparison of these data of their petrophysical properties. Additionally petrophysical anomalies in the external contact of ore horizons were identified. Using of this methodology may contribute to improving the efficiency of survey and evaluation work on Norilsk type sulfide mineralization.
Reconstruction of the Monchegorsk layered intrusion (assessing the composition of the original magma and the condition of its kristallization)
Authors: Semenov V. S. , Koptev-Dvornikov E. V. , Semenov S. V. , Korneev S. I.
Published: January 2022

Made an attempt of reconstruction structure of the Monchegorsk layered intrusion, assessing the composition of the original magma and the conditions of its kristallization. The problem was solved by simply comparing the structure of the Monchegorsk Intrusive with a similar analog (for this purpose, the Kivakka layered Intrusive was chosen), as well as using model constructions using the COMAGMAT software package.
Vysotskite holotype as metamorphogenic-hydrothermal vysotskite (Pd,Ni)S from the Norilsk-I deposit
Authors: Spiridonov E. M.
Published: January 2022

Vysotskite is developed in Co-Ni-Cu sulphide massive and disseminated (“amygdaloid”) ores of the Norilsk-I deposit, entrained by post-trap low-grade metamorphism in the conditions of prehnite-pumpellyite and zeolite (lomontite) facies. Vysotskite associates with ferrian chlorite, cummingtonite, grünerite, prehnite, corrensite, ilvaite, babingtonite, pumpellyite, grinalite, millerite NiS, polydymite Ni3S4, galenite and chalcopyrite. This facies of metamorphosed sulphide ores were formed in the conditions of low oxidative potential and relatively high sulphide sulfur fugacity. This vysotskite is extremely poor in platinum, enriched in nickel and partly in iron. The average composition of studied vysotskite is (wt%, n=17): Pd 65,65; Pt 0,12; Rh, Au traces; Ni 8,25; Fe 0,95; Cu 0,32; Co 0,03; S 25,03; As 0,03; sum 100,38; the formula of the mineral is (Pd0,79Ni0,18Fe0,02Cu0,01)1S1. According to mineral associations and chemical composition, the described vysotskite corresponds to vysotskite discovered by A.D. Genkin and O.E. Zvyagintsev [1962]. Therefore, vysotskite holotype is metamorphogenic-hydrothermal vysotskite of the Norilsk-I deposit with (Pd,Ni)S composition.
Cristobalite and tridymite from deposits of the Arsenatnaya fumarole (Tolbachik volcano, Kamchatka, Russia)
Authors: Sandalov F. D. , Schipalkina N. V. , Pekov I. V. , Koshlyakova N. N. , Britvin S. N. , Sidorov E. G.
Published: January 2022

This article displays data on cristobalite and tridymite from the Arsenatnaya active fumarole, the Tolbachik volcano, Kamchatka, Russia. The minerals occur in associations with fumarolic sylvite, sanidine, cassiterite, hematite, pseudobrookite, johillerite, tilasite, badalovite. Fumarolic cristobalite is tetragonal (-modification); the unit-cell parameters for one of samples are: а = 4,975 (7) Å, с = 6,944 (13) Å, V = 171,89 Å3. There are two types of tridymite — monoclinic (MC) and orthorhombic (PO-10) — in the Arsenatnaya fumarole. The unit-cell parameters of these tridymite modifications are: a = 18,553 (5), b = 5,006 (1), с = 25,952 (10) Å,   = 117,68 (2)o, V = 2134,3 (11) Å3 (MC); a = 9,941 (2), b = 17,165 (4), с = 82,362 (18) Å, V = 14053,4 (29) Å3 (PO-10). Mineral assemblages of cristobalite and tridymite indicate high-temperature formation conditions of these minerals — not lower 450–500 °С — with a high participation degree of HCl and HF in process of basalt alteration by fumarolic gas. The surrounding basalt was a source of silicon. This element was, probably, transported in the form of SiX4, where X = F, Cl.
Formes of metals in water and bottom sedimets of the Malaya Senga river (Vladimir region)
Authors: Drozdova O. Yu. , Karpukhin M. M. , Dumtsev S. V. , Lapitsky S. A.
Published: January 2022

In the work the speciation of metals in the water and bottom sediments of the Malaya Senga River, located in the Petushinsky district of the Vladimir region were studied. It is shown that all studied metals in the waters are predominantly in a dissolved form. At the same time, most of Fe, Cu, Cd and Pb in river waters are in the form of complexes with organic substances (which are mainly represented by their negatively charged compounds), and the main forms of occurrence of Ni and Zn are inorganic compounds and cationic complexes with low molecular weight organic ligands.

In bottom sediments for the metals, the share of migratory forms of metals relative to the total contents is from 10 to 30%, while a significant part of them is represented by forms associated with iron and manganese hydroxides.
Impact of planned heterogeneity of hydraulic conductivity on the results of pumping in an isolated unconfined layer
Authors: Sizov N. E. , Pozdniakov S. P. , Muromets N. N.
Published: January 2022

The paper presents the results of numerical simulation of cluster pumping test in an heterogeneous aquifer with transmissivtyvariability described by the model of a stationary random field of its logarithm with a given scale of correlation in the plan. The case of comparable planar distance to observation wells and correlation scale is considered. Parameters of the model of transmissivity heterogeneity of the simulated aquifer are obtained from the data of experimental tests carried out within the limits of the South Voronezhskoye groundwater field. The simulation has shown that the average results of interpretation of these cluster pumping data correspond to the geometric value of the transmissivity, which confirms the previously obtained approximate theoretical result for the model of small-scale heterogeneity and extends it to an almost important case of similarity of cluster well test planar sizes and spatial scale of heterogeneity. Thus, the present study has confirmed the possibility to apply standard methods in processing of cluster pumping data under planned heterogeneity conditions to estimate the equivalent aquifer transmissivity in the well cluster location area.
Unpredictibility of strong earthquakes: new understanding of the problem and its solution
Authors: Koronovsky N. V. , Zakharov V. S. , Naimark A. A.
Published: January 2022

The inefficiency of short-term forecasting of strong earthquakes is obvious. New methods and hypotheses of preparation of seismic events are interesting, but exact and reliable forecasts will not follow. Unpredictability is undoubtedly predetermined by nonlinearity, self-similarity, by a chaotic (not stochastic) and by bifurcations dynamics of seismic process in fractal geomedium. Superdependence of dynamic systems on initial conditions, vagueness of distinctions of background and abnormal structures and conditions, at rigid requirements to adequacy and representativity of forecasts, inevitably lead, to the negative decision of a problem. This article continues the long-standing scientific discussion about earthquake prediction, which was resumed after the our publication [Koronovsky et al., 2019].
Lithological and geochemical characteristics and paleoclimatic conditions of the Turonian-Santonian deposits of the epicontinental basin of the Russian plate in the region of the Voronezh anteclise
Authors: Gabdullin R. R. , Puzik A. Yu. , Merenkova S. I. , Migranov I. R. , Badulina N. V. , Kazurov M. D.
Published: January 2022

The results of geochemical research of the cyclic section of the Upper Cretaceous deposits near Staryi Oskol town at Belgorod province and paleogeographical and paleoclimatic interpretation of these data were given for the first time.
Experimental study of the possibility of using a silica clay as a source of silicon in the production of glass in the Turkestan region of Kazakhstan
Authors: Zhakipbayev B. Ye. , Alferyeva Ya. O. , Ksenofontov D. A. , Kotelnikov A. R.
Published: January 2022

Three series of experiments were carried out to study the possibility of replacing quartz sand in the initial charge for the production of glass with a silica clay. The experiments were carried out at atmospheric pressure and temperatures of 900–1200 С. It is shown that the complete replacement of quartz sand with a silica clay and the use of the presented initial compositions based on silica clay in the glass industry will lead to an increase in the temperature in the technological scheme of production, an increase in energy consumption and is economically unprofitable.

Production schemes are promising, in which, along with the silica clay, the original charge contains cullet. It is shown that the disappearance of crystalline phases in this case in the samples with the addition of the silica clay occurs at a lower temperature than in the samples without the silica clay.
Behavior of lithium in the liquidus part of a high-fluorine granite system at pressures from 10 to 50 MPa
Authors: Shchekina T. I. , Rusak A. A. , Alferyeva Ya. O. , Gramenitskiy Ye. N. , Khvostikov V. A. , Kotelnikov A. R. , Bychkov A. Yu. , Zinovieva N. G.
Published: January 2022

The distribution of lithium between aluminosilicate and alkali-alumina-fluoride salt melts in a granite system with the limiting contents of water and fluorine at temperatures of 700– 800° C and pressures of 10–50 MPa has been experimentally studied. It is shown that lithium is distributed in favor of the salt melt under all conditions. An increase in the water content in the system by more than 20 wt.% and a pressure from 10 to 50 MPa leads to a decrease in the partition coefficients of lithium between the salt and aluminosilicate melts by 2–4 times.
Fractionation of rare earth elements and yttrium in aqueous media: the role of organotrophic bacteria
Authors: Kazak E. S. , Lebedeva N. A. , Kharitonova N. A. , Chelnokov G. A. , Elovsky E. V.
Published: January 2022

The paper presents the experimental results of the rare earth elements and yttrium (REY) biosorption in the natural surface waters and groundwater in the presence of living and inactivated organotrophic bacteria (Curtobacterium sp., Ralstonia sp., Pseudomonas sp., Bacillus sp., Brevibacterium sp., Microbacterium sp.,) under different environmental pH conditions. We find that the biosorption process is mainly regulated by two factors: the aqueous solution’s pH and the bacteria strains concertation. The water acidity significantly effects on the bacteria sorption capacity for all studied strains. We discover a decrease in REY sorption with an increase in pH due to lower absorption of REY on the cell walls of bacteria. The process of REY biosorption proceeds more intensively by living bacteria than in the presence of inactivated microorganisms. We observe that at neutral pH values all studied bacterial strains sorb light REY (lanthanum, praseodymium, neodymium), in more acidic solutions (pH 2) the heavy ones (lutetium, europium). The REY sorption decreased with an increase in the living and inactivated bacterial concentration.
Mineral and raw material complexes of BRICS countries — mutual supply of mineral commodities and joint regulation of international minerals market
Authors: Dergachev A. L.
Published: January 2022

Mineral complexes of BRICS countries are supplementary to each other and one of promising directions of cooperation of the countries in this field is an expansion of mutual trade with mineral commodities and metals. In 2006–2018 the principal beneficiaries from such cooperation were SAR and Brazil which managed to dramatically increase export of commodities produced by their powerful mineral complexes in other BICS countries. On the other side close cooperation with these countries enabled China to turn into the principal customer of minerals and metals in international market, secure continuity of supply and price stability and get excess to mineral resources of other countries of the organization. At the same time expectation of future cooperation of BRICS countries in regulation of international mineral market for a number of reasons occurred to be strongly exaggerated.
Seismic geomorphological analysis of the oligocene-neogene sediments in the north-eastern part of the Black Sea
Authors: Baskakova G. V. , Kulyukina N. A. , Arzamastseva T. A. , Malyashev N. A. , Almendinger O. A. , Nikishin A. M.
Published: January 2022

The evolution of the deep-sea sedimentation system in the north-eastern part of the Black Sea during the Oligocene-Pliocene is considered mainly on the basis of seismic data. The fans and erosion canyons formation time is presumably related to the regressive-transgressive stages in the history of the Eastern Paratethys. The source areas of detrital sediments in the Tuapse Trough are identified. The sedimentation model of the Tuapse Trough and the changes in the Trough’s morphology since the Oligocene were reconstructed based on the analysis of the thickness maps and the onlap surfaces on the northern side of the Shatsky Swell. Paleogeographic maps were compiled for the Late Oligocene-Early Miocene (Maikop), Middle Miocene, and Pliocene.