bluuebunny/crossref_metadata_2025_split huggingface dataset:
Assessment of the impact of geological and production parameters on the effectiveness of acid fracturing in the fields with carbonate reservoirs
Authors: Voronova E V , Petrova L V , Gutorov A Yu 
Published: May 2022

Abstract
A number of different geological and production parameters affecting successful acid fracturing are considered in the conditions of carbonate reservoirs of oil fields in Bashkortostan. The study results are of use for assessing the effectiveness of geological and technical measures and for a more reasonable choice of candidate wells for acid fracturing.
Laboratory experiments on oil displacement using complexes based on enzyme solutions on a reservoir model
Authors: Veliev E M , Mukhametshin V V , Kuleshova L S , Veliev M M , Shchetnikov V I , Thanh Vu Viet , Samigullina L Z 
Published: May 2022

Abstract
It is shown that the oil recovery of all tested samples increases after treatment with the enzyme solution; the oil displacement coefficient varies within 7.23 – 10.59%. The change in values is associated with various characteristics of core samples in terms of porosity, permeability, initial oil saturation, as well as lithological composition. The model clearly demonstrates that the differential pressure decreases after enzyme solution treatment. This indicates that the presence of the enzyme solution changes the wettability of oil with oil-bearing rock. Oil is easily displaced from the core sample and, therefore, the permeability of the core sample increases. The outcomes of studying water permeability of core samples before and after injection of the enzyme solution reveal that the sample permeability increases when using the enzyme solution (the recovery coefficient of the core sample permeability is 1.34-1.68).
Determination of cutting process parameters for tooth of excavator active bucket
Authors: Muravskiy A K 
Published: May 2022

Abstract
Excavators with the active buckets are able to produce digging frozen, durable soils and hard rocks. The widespread introduction of active buckets is constrained by a number of reasons, including an incomplete theoretical description of the active bucket operation and the process of interaction of the active bucket with soil and rock. In this work, the absolute speed of movement of the cutting edge of the tooth, the cutting angle and the clearance angle of cutting are mathematically determined.
The role of deep faults in the structure formation of the TCFD, the distribution of hydrocarbon accumulations, and thermomineral sources
Authors: Daykaev A A , Abubakarova E A , Elzhaev A S , Khasanov M A , Ezirbaev T B , Germakhanova D U , Alieva Kh A , Shaipova A A 
Published: May 2022

Abstract
The work purpose was to assess the prospects of oil and gas potential of the western part of the Tersko-Caspian trough (TCT) concerning the development of deep-sunk areas in the light of modern ideas about the deep-seated formation of hydrocarbons. The main tasks are to analyze the ideas about the formation mechanism of the tectonic structure and formation of hydrocarbon accumulations; to study the relationships between the formation processes, migration, and the areal distribution of hydrocarbon accumulations; to determine the main prerequisites for the deep genesis of oil and gas. The scientific novelty lies in a comprehensive approach to the study of the formation processes of hydrocarbons, migration, the formation of traps, and patterns of placement of hydrocarbon accumulations. The article describes the mechanisms of formation of the Tersk and Sunzha composite anticline as the main zones of oil and gas accumulation. It is suggested that the formation of high-amplitude anticline folds in the upper cretaceous deposits resulted from the vertical migration of high-pressure fluids along deep faults with the breakthrough of their upper horizons of the sedimentary cover into the late-orogenic folding stages. The main prerequisites for the deep genesis of oil and gas are listed as pronounced uneven distribution of hydrocarbon accumulations, AHFP, hydrochemical anomalies, etc.
Results of identification of ineffective oil objects in carbonate reservoirs
Authors: Grezina O A 
Published: May 2022

Abstract
The article presents data on the selection of oil analogous objects using multidimensional exploration analysis of geological and physical parameters. The main components and ineffective objects in the carbonate reservoirs of the Tournaisian stage confined to tectonic elements within the inner and outer zones of the Cis-Ural passive margin of the East European paleocontinent were analyzed. The study showed that the use of codes of the tectonic elements to which the facilities belong as a grouping variable makes it possible to identify groups with common characteristics. It is recommended to apply the successful experience of stimulating oil production by acid-implosion in the wells of the Tournaisian stage of the Almetyevsk peak field to the facilities of the same and adjacent (Belebeevsko-Shkapovskaya peak) groups with close axe coordinates for the main components.
The influence of reservoir rock fractures on the efficiency of geotechnical jobs on the Yamal oilfields
Authors: Sharapov A S 
Published: May 2022

Abstract
At present, the majority of Yamal oilfields are characterized by low debits. That is why geotechnical jobs (GTJ) are conducted here to increase oil production. Thus, this article analyzes predicted and actual efficiency of GTJ on nineteen Yamal oilfields in 2010-2017. Therefore, the purpose of the article is to provide information on the quantity and efficiency of GTJ on Yamal oilfields as well as to interpret the results obtained. The question is how reservoir rock fractures influence GTJ. So, much attention is given to the efficiency of hydraulic fracturing operation (HFO) in relation to the rate of field tectonical diversity. In fact, our analysis shows that physical and chemical methods take the leading place among the quantity of actual operations. It was also found that the biggest incremental oil production was obtained from drilling horizontal drain holes, but the smallest quantity – from remedial cementing. Furthermore, the results presented here show the dependence of HFO efficiency on the rate of field diversity. In conclusion, actual data prove that double permeability of reservoir rock increases the efficiency of well perforation, HFO and physical and chemical methods as well as its dependence on the rate of field diversity. The findings are of direct practical relevance.
Gas content and gas-dynamic characteristics of rocks of the IV-p horizon of the Starobin deposit of potash salts
Authors: Bobrov D A , Litvinovskaya N A , Nesterov E A 
Published: May 2022

Abstract
The article presents the results of studies of the gas content and gas-dynamic characteristics of the free gas contained in the salt rocks of the IV ℃ p horizon of the Starobin deposit of potash salts. The research was carried out in the workings of the Petrikovsky ore enrichment plant. The IV-p horizon was discovered for the first time and data on the content of free gas in the rocks have not existed until now. Given that mining operations in other potash horizons and areas of the field are regularly accompanied by various gas-dynamic phenomena, all commissioned horizons and new areas should be examined for the content of free gas in the rocks and at the rock contacts. For the research, mine instrumental observations were used according to the methodology developed at the Mining Institute of the Ural Branch of the Russian Academy of Sciences. The obtained data serve as the basis for the development of recommendations for the safe conduct of mining operations in the rocks of the IV – p horizon.
The comparison of methods for modeling seismic impact on buildings and structures
Authors: Kravchenko G M , Trufanova E V , Mazhiev K Kh , Mazhiev Adam Kh , Mazhiev Aslan Kh , Mazhieva A Kh 
Published: May 2022

Abstract
The article compares methods for modeling seismic effects on buildings and structures to improve the structural safety of design solutions. A linear-spectral method of accounting for seismic impact and an integral model are considered. Seismic loads are determined along the main axes of the building under study, taking into account translational and rotational effects. The orientation of the cosines of the seismic impact on the building is calculated. The assessment of participation factors for each form of natural fluctuations is carried out. Combinations of seismic loads are compiled, their influence on the stress-strain state of the building frame structures is analyzed. Recommendations for modeling the seismic impact on buildings and structures by the finite element method have been developed. The proposed algorithm for modeling seismic effects by the finite element method allows determining the most dangerous propagation of seismic effects in accordance with the modal analysis of the frame of a multi-storey building.
Initial strength analysis of reinforced concrete monolithic supports for spherical and cylindrical mine workings
Authors: Zaitsev A V , Kutergin A V , Fukalov A A , Votinov A S , Kolytchev I Yu 
Published: May 2022

Abstract
By using decomposition of hoop and radial components of the displacement vector to the trigonometrical and generalized power series, we obtained the new exact analytical solutions to problems of the equilibrium state of thick-walled heavy anisotropic central-and axial-symmetric bodies fixed on their external surfaces and subject to uniform internal lateral pressure. The estimation of an initial strength of cylindrical and spherical reinforced concrete monolithic mine working supports for a long-term storage of gas and oil is carried out on the basis of a multicriteria approach taking into account real damage mechanisms. They include damage from tension or compression in radial, hoop and axial directions, and from transversal and antiplane shear) of anisotropic axial- and central-symmetric bodies.
Assessment of the fracture stress of clay-carbonate rocks of the Vereiskian reservoir for oil fields in the Perm region
Authors: Votinov A S , Zaitsev A V , Rozhkova Yu A , Osovetsky B M , Seredin V V 
Published: May 2022

AbstractCurrently, one of the most effective stimulating oil production methods from the Vereiskian production zones of oil fields in Perm Krai is proppant hydraulic fracturing (PHF). The effectiveness of the method largely depends on the geometric dimensions of the fracture and the optimal distribution of the proppant in it. The mudstones of the Vereiskian stage limit the growth of the fracture in height, but in certain cases its can be broken in the course of hydraulic fracturing. In this regard, the determination of the conditions for their fracturing is an urgent and important task. In the absence of rock samples of proper quality, the chemical composition of mudstones was determined during the study. The obtained results are compared with the existing data on the minerals of the montmorillonite group of clays. To determine the parameters of the ultimate stress state of the formation, a Mohr’s circle of stress is constructed using the known values of the compressive stress and the angle of internal friction of the clays. As a result, the fracture stress of mudstones is obtained, which is in the range of bottom-hole pressures during hydraulic fracturing, that is, there is a possibility of fracture growth outside the target interval.
Improving the technology of opening productive layers to boost the productivity of exploration and production wells
Authors: Chizhov A P , Andreev V E , Kuleshova L S , Mukhametshin V V , Andreev A V , Chibisov A V 
Published: May 2022

Abstract
The article describes the results of improving the well construction completion technology. The factors and processes decreasing technological indicators of new exploration and production wells are analyzed. Research is based on systemic approaches to solving complex scientific and technical problems. The parameters of implementation of the improved technology are presented. The results of field trials intended to implement the technology in the construction of wells in Russian regions are analyzed.
Experience of applying the shock wave impact method for the bottomhole zone
Authors: Khusnutdinova R R , Petrova L V , Yusupova L F , Gilyazetdinov R A 
Published: May 2022

Abstract
Improving the processes of exploration and development of fields, as well as increasing the productivity of oil reserves using physicochemical methods are one of the main tasks in stabilizing oil recovery and increasing the oil recovery factor. The most rational method used for hard-to-recover reserves is the shock-wave impact technology. This method can stimulate the release of energy from anomalously stressed zones and intensify the influx of hydrocarbons from deep layers of the Earth along the tectonic faults and sub-vertical inversion ring structures. The article presents the results of a study of the shock-wave impact on production wells of the Sabanchinskoye field and discusses factors that reduce the profitability of this technology.
Temperature-baric behavior of the effective thermal conductivity of sandstones
Authors: Emirov S N , Aliverdiev A A , Aliev R M , Beybalaev V D , Ramazanova E N , Amirova AA 
Published: May 2022

Abstract
The paper presents the results of measurements of the effective thermal conductivity of three sandstone samples exhibiting different structural ordering in the temperature range 273-523 K and pressures from atmospheric to 400 MPa, as well as (2) a low-parameter model, described as a temperature dependence at a fixed pressure and the pressure dependence at a fixed temperature. It also describes the influence of pressure on the nature of the temperature dependence. The samples from the following deposits were studied: (1) Kochubei, the Republic of Dagestan, (2) Buinaksk, the Republic of Dagestan, and (3) the Tyumen superdeep well. It was shown that the cumulative increase in temperature and pressure for sandstones with different structural ordering (even when the absolute values of the effective thermal conductivity at atmospheric pressure and room temperature are close) can have a qualitative difference and with a predominantly amorphous ordering, it must be taken into account when compiling temperature models in the terrestrial bark.
Turbulent drag reduction by spanwise slot blowing pulsed plasma actuation
Authors: ZHENG Borui , JIN Yuanzhong , YU Minghao , LI Yueqiang , WU Bin , CHEN Quanlong 
Published: May 2022

Abstract
This work studies the turbulent drag reduction (TDR) effect of a flat plate model using a spanwise slot blowing pulsed plasma actuator (SBP-PA). Wind tunnel experiments are carried out under a Reynolds number of 1.445 × 104. Using a hot-wire anemometer and an electrical data acquisition system, the influences of millisecond pulsed plasma actuation with different burst frequencies and duty cycles on the microscale coherent structures near the wall of the turbulent boundary layer (TBL) are studied. The experimental results show that the SBP-PA can effectively reduce the frictional drag of the TBL. When the duty cycle exceeds 30%, the TDR rate is greater than 11%, and the optimal drag reduction rate of 13.69% is obtained at a duty cycle of 50%. Furthermore, optimizing the electrical parameters reveals that increasing the burst frequency significantly reduces the velocity distribution in the logarithmic region of the TBL. When the normalized burst frequency reaches f
+ = 2π
f
p
d/U
∞ = 7.196, the optimal TDR effectiveness is 16.97%, indicating a resonance phenomenon between the pulsed plasma actuation and the microscale coherent structures near the wall. Therefore, reasonably selecting the electrical parameters of the plasma actuator is expected to significantly improve the TDR effect.
Classification of steel based on laser-induced breakdown spectroscopy combined with restricted Boltzmann machine and support vector machine
Authors: ZENG Qingdong , CHEN Guanghui , LI Wenxin , LI Zitao , TONG Juhong , YUAN Mengtian , WANG Boyun , MA Honghua , LIU Yang , GUO Lianbo , YU Huaqing 
Published: May 2022

Abstract
In recent years, a laser-induced breakdown spectrometer (LIBS) combined with machine learning has been widely developed for steel classification. However, the much redundant information of LIBS spectra increases the computation complexity for classification. In this work, restricted Boltzmann machines (RBM) and principal component analysis (PCA) were used for dimension reduction of datasets, respectively. Then, a support vector machine (SVM) was adopted to process feature information. Two models (RBM-SVM and PCA-SVM) are compared in terms of performance. After optimization, the accuracy of the RBM-SVM model can achieve 100%, and the maximum dimension reduction time is 33.18 s, which is nearly half of that of the PCA model (53.19 s). These results preliminarily indicate that LIBS combined with RBM-SVM has great potential in the real-time classification of steel.
Thermodynamics and optimal protocols of multidimensional quadratic Brownian systems
Authors: Abiuso Paolo , Holubec Viktor , Anders Janet , Ye Zhuolin , Cerisola Federico , Perarnau-Llobet Martí 
Published: May 2022

AbstractWe characterize finite-time thermodynamic processes of multidimensional quadratic overdamped systems. Analytic expressions are provided for heat, work, and dissipation for any evolution of the system covariance matrix. The Bures-Wasserstein metric between covariance matrices naturally emerges as the local quantifier of dissipation. General principles of how to apply these geometric tools to identify optimal protocols are discussed. Focusing on the relevant slow-driving limit, we show how these results can be used to analyze cases in which the experimental control over the system is partial.
A rolling bearing status monitoring method based on subband spectral fuzzy description
Authors: Harhoud Brahim , Ramdani Messaoud , Lachouri Abderrazak , Bekaik Mounir 
Published: May 2022

Abstract
Vibration signals provided by rotating machinery are informative signals about their operating states. By nature, the vibration signal behavior is non-stationary. To this end, the extraction of discriminating and fault-sensitive parameters is a major challenge in the field of monitoring rotating machines. Conventional fault diagnosis methods based on signal processing use statistical feature parameters in time domain, frequency domain and time-frequency representation. In this article, a new method is proposed for the detection and classification of bearing defects based on spectral subband using frequency membership functions. Statistical parameters including subband energy, Center frequency, root variance frequency and Shannon entropy are considered. Compared to the common features, the extracted parameters can provide discriminating information. These feature parameters are finally fed into a generalized RBF neural network system trained with the Resilient Backpropagation (Rprop) algorithm to classify seven pre-established fault types in ball bearings operating under multiple shaft speeds and load conditions. The results suggest that the proposed system can significantly improve the diagnostic performance in terms of accuracy and estimation of the bearing fault level.
NO2 sensing with CdS nanowires at room temperature under green light illumination
Authors: Li Peipei , Jin Hongqiang , Yu Jia , Chen Weiming , Zhao Runqing , Cao Changyan , Song Weiguo 
Published: May 2022

Abstract
Detection of ppb-level NO2 gas under atmosphere is urgent to meet the requirements of the rapidly developing internet of things. Compared with traditional sensing methods, light illumination has been considered as a key approach for excellent gas sensor performance under moderate conditions. Herein, we developed a green-light-assisted gas sensor based on cadmium sulfide nanowires (CdS NWs) that has good NO2 sensing capability at ambient temperature. The response values of NO2 are 236% and 11% to 10 ppm and 12.5 ppb, respectively. Furthermore, the CdS NWs sensor has a high selectivity for NO2 over a variety of interference gases, as well as good stability. The cleaning light activation and the sulfur vacancy-trapped charge behavior of CdS NWs are observed, which suggest a light-assisted sensing mechanism. These results suggest that light-induced charge separation behavior might significantly improve gas-sensing characteristics.
Clinical Use of Extracellular Vesicles in the Management of Male and Female Pattern Hair Loss: A Preliminary Retrospective Institutional Review Board Safety and Efficacy Study
Authors: Sasaki Gordon H 
Published: May 2022

Abstract

Background
Pattern hair loss is a common disorder in female and male patients.

Objectives
To assess the safety, efficacy, and satisfaction of a single extracellular vesicle (EV) treatment over 6 months.

Methods
A retrospective open-label study among 22 female and 9 male patients who demonstrated early stages of alopecia or were in remission from previous medical and surgical treatments. The amount of undiluted or diluted volumes of EV solution used was determined by the extent and degree of alopecia. Global photography, Patient Global Aesthetic Improvement Scale (PGAIS) and Investigator Global Aesthetic Improvement Scale (IGAIS) questionnaires, and trichoscan measurements were compared at baseline and 6 months in 3 response categories.

Results
Frequent growth responses were observed: older aged females and younger aged males, shorter history of alopecia, earlier stages of hair loss, larger and undiluted volumes of XoFlo, previous positive responses to medical and surgical treatments, and absence or control of disease factors affecting the hair. Global photography, trichoscan for density, follicle diameter, terminal: vellus ratio, and PGAIS/IGAIS satisfaction questionnaires at baseline and 6 months were useful in assessing clinical efficacy. No significant adverse reactions were observed.

Conclusions
Intradermal injections with varying doses of EVs were safe and effective among indicated alopecic female and male patients. Findings suggest that the presence of positive factors, absence of conditions known to negatively affect hair growth, and administration of larger volumes of XoFlo may have a significant influence on the use of this new cell-free therapy.

Level of Evidence: 4