bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estimation of the forecast of pump ready rate for reclamation systems
Authors: Glovatsky Oleg , Ergashev Rustam , Nasirova Naira , Kholbutaev Boybek , Khusanbayeva Khusnora 
Published: January 2021

Abstract
The aim of the authors’ research is to improve the hydraulic conditions for supplying the flow to the impeller and to reduce the cavitation wear of the pump working bodies. This goal is achieved by the fact that the device for supplying liquid at the inlet to the pump contains guide elements in the form of flat plates mounted on the axis of the suction pipe. With further modernization, the pumped liquid was stabilized after the impeller, with the elimination of vortex flows along the entire flow path of the pump due to new elements in the pump chamber. The problem is solved by the design of a straightening blade with a free cross-sectional area of the wall channel less than the inner channel. The research methods include the conduct of field and laboratory studies using modern technical means of observation. Long-term experimental work carried out at large pumping stations investigates interconnected systems of connecting structures and pumps. The stability function is determined as a result of taking into account a number of factors: the external environment, technological properties of systems and operational requirements. The change in the critical, from the point of view of the emergence of cavitation, the value of the pump supply from different densities of the pumped liquids was established as a result of bench tests. In the experiments, the cavitation erosion of the growth was compared with analogs in the average 90-100 times. The ratio of the performance of the surface tension force to the density for mercury and water at a temperature of 15° C turned out to be equal to 91. As a result of the development of a new design together with Joint-Stock Company SUVMASH and the method of calculating the working parts of the pump with a minimum wear rate of the pump with a minimum wear rate of 5%.
Current use of water intake structures of reservoirs
Authors: Urishev Adham 
Published: January 2021

Abstract
The detailed study of the flow of water in this area is of great importance in designing the sub-surfaces of the drainage and drainage structures of hydraulic structures. In particular, the complex processes associated with the flow of water in the lower and lower reaches of reservoirs of low and medium size play an important role in the choice of appearance, constructive elements and their shape, size and location.
Results of a numerical study of currents in the vicinity of a damless water intake
Authors: Krutov Anatoly , Norkulov Bekhzod , Uljaev Farokhiddin , Jamalov Farkhod 
Published: January 2021

Abstract
The problem of sustainable water intake in the conditions of significant fluctuations of flow rates and water level is significantly exacerbated by erosion of river beds. A typical example of such conditions is the damless water intake into the Karshi Main Canal (KMC) where the main flow of the Amudarya river continuously moves along a wide floodplain, changing the direction of currents. As a result, it is very difficult to withdraw the required volume of water from the river to the canal especially during dry years due to the high instability of currents at the entrance to the canal.
Within the framework of the performed numerical studies, the conditions of flow spreading (vectors of depth-average velocities) were studied in the specific time intervals and crossings in the water intake area. The results of the study confirmed that without special engineering measures it is practically impossible to assure stable water diversion into the canal. As a preliminary solution of the problem, it was proposed to make a trench along the right bank in the area of water intake into the canal.
Hydraulic modes of damless water intake
Authors: Uralov Bakhtiyor , Rakhmatov Norkobul , Khidirov Sanatjon , Safarov Gayrat , Uljaev Farokhiddin , Raimova Ikboloy 
Published: January 2021

Abstract
The article is devoted to the study of the influence of the damless water intake on the hydraulic and alluvial regime of the river, the channel of which passes through easily washed out soils. The analysis of the dynamics of the river bed morphometry and hydraulic elements of the flow in the area of the damless water intake is carried out. As a result of the analysis of the data of long-term field studies and hydrometric measurements at the closest section to the damless water intake and in the area of the damless water intake of the Amudarya River, functional relationships were established between the morphometric parameters of the channel and the hydraulic parameters of the flow. The dynamics of the Shezi coefficient, hydraulic resistance, and the channel roughness coefficient in connection with the hydrodynamic characteristic of the flow are established.
The height of the pumping unit suction pipe inlet relative to the riverbed bottom
Authors: Ikramov Nazir , Majidov Takhir , Kan Eduard , Akhunov Doniyor 
Published: January 2021

Abstract
Currently, 78% of all irrigated land in Uzbekistan is provided with water by pumping stations and installations. The water sources of most pumping stations are rivers and irrigation channels that transport a large amount of bottom and suspended sediments. Due to the lack of consideration of bottom sediments moving in the form of ridges, when installing the pumping units suction pipeline, during their operation, these bottom pumps flow from the water intake source in the interior of the units. As a result, intensive waterjet wear of the flow part and the impeller of the pumps occurs. This leads to an intensive reduction in the main parameters of the pumps, as well as reduces their repair period. Currently, this is one of the major problems of pumping stations that take water from the Zarafshan river, as well as those operating on the Karshi, Amu-Bukhara, Amu-Zang and Jizzakh main channels. Laboratory studies were carried out on the experimental installation to determine the height of ridges with different granulometric composition of bottom sediments. As a result, a formula was obtained for determining the height of the ridge, taking into account the heterogeneity of ridge forms. Based on the obtained formula, a method for setting the height of the pumping unit suction pipe inlet relative to the riverbed bottom is recommended. The application of the proposed method does not allow bottom sediments to enter the inner part of the pumps, as a result of which their intensive abrasive wear decreases, the inter-repair period increases, while maintaining its main parameters for a long time.
Numerical method for solving the problem of the gas-dynamic state of a main gas pipeline section relief of a variable cross-sectional area
Authors: Bazarov Orifjan , Khujaev Ismatulla , Mamadaliev Khusniddin , Khodjayev Shukhrat 
Published: January 2021

Abstract
The paper proposes a numerical method for solving the problem of the gas-dynamic state of a main gas pipeline linear section, which is characterized by a path change in the diameter and leveling height of the pipeline axis. The quasi-one-dimensional equations of gas pipeline transport are derived with account for the local and convective components of the inertia force, the quadratic law of resistance and the force of gravity at a variable cross-sectional area of the pipeline. At the inlet to the section, a time change in hydrostatic pressure is set, and at the outlet from the section a mass rate of gas flow is set. The initial distribution of gas-dynamic indices was taken for a stationary mode of operation. The equations were transformed to the equations of direct and reverse traveling waves presented in dimensionless variables, and approximated by an implicit scheme, taking into account the direction of excitation propagation. The iterative processes were formed by virtue of the nonlinearity of equations and boundary conditions, A calculation program was developed that allowed studying the process dynamics depending on the time change in the inlet pressure and the outlet mass flow rate under a path change in the diameter and leveling height of the pipeline axis. The results of separate calculations on transient processes were presented, when, at the section outlet the mass flow rate increases abruptly, and the pipe diameter has a local increase according to a sinusoidal law.
Effectiveness of rainwater irrigation in agricultural crops in the context of water resources
Authors: Khamidov Mukhamadkhan , Muratov Ashurbek 
Published: January 2021

Abstract
The article provides information on systemic reforms in the organization of efficient use of water resources in Uzbekistan and published by the International Commission on Irrigation and Drainage, as well as the interim results of scientific work carried out at TIIAME to address this issue. Extreme scarcity of water resources in Central Asia, the area of irrigated lands in the world, water resources used in agriculture, their economical use, economical irrigation technologies used to increase efficiency, the scope of sprinkler technology and the benefits of sprinkler irrigation. and technical specifications are given.
Stresses in subsidence bases of flutbet models under the moisturizing conditions
Authors: Xujakulov R 
Published: January 2021

Abstract
The practice of construction and operation of irrigation facilities on loess nodded soils shows that properly designed facilities, which are erected with high quality, can work for a long time without violating their operational suitability. At the same time, the specificity of the engineering and geological conditions of certain regions of the Republic of Uzbekistan, i.e. for strongly and inhomogeneous subsidence soils, it requires correcting some provisions of regulatory documents, to take into account the peculiarities of the stress-strain state of the “structure -subsidence base” system, which depends both on the structure of the hydraulic structure and the physical and mechanical properties of the soil changing during moistening. The specifics of the work of hydraulic structures consists that in the overwhelming majority of cases, their soil bases are moistened to the level of maximum water saturation. However, in the first time after the commissioning of the hydraulic structure, the soil mass is moistened unevenly, which affects the nature of the interaction between the foundation and the structure. The article presents the results of studying the patterns of stress variation in subsiding ground foundations in experimental studies of the stress-strain state of the loess bases of tubular crossings, which are widely distributed in irrigation systems of the south of the Republic of Uzbekistan.
Mathematical modelling of pipelines, including equipment, levelling sharp changes in fluid pressure
Authors: Rekach Fedor , Shambina Svetlana , Belousov Yuri 
Published: January 2021

Abstract
The article deals with the issues related to the modelling of unsteady fluid flow in short and long pipelines, including various equipment: pumping stations (equipped with cen-trifugal or piston pumps), valves of different operating principle, pressure stabilizers, etc. Pres-sure stabilizers (especially in short pipelines) are able to protect the pipeline from sudden pres-sure surges. This is important not only in terms of the strength of the pipeline system, but also in short pipeline circuits for a uniform flow of liquid fuel supply. As a mathematical tool for numerical solution of differential equations of quasi-hyperbolic type, the method of character-istics is applied, which allows to consider the problems that develop over time. The program is written in C++ with graphical interpretation in Maple.
Determination of the mean velocity of mudflows (debris flows) taking into account their life cycle
Authors: Volgina Ludmila , Sergeev Stanislav 
Published: January 2021

Abstract
The paper is about calculation of the mean velocity of the mudflows. A mudflow is unsteady, non-uniform two-phase flows with high concentration of solid particles. Basic characteristics (depth, width, particle mean concentration and diameter) of a mudflow change in wide range (in time and in space), thus should be considered as a dynamic system. Existing empirical formulas for the mean velocity not for its. However, the principle of calculating the mean velocity must change for each phase of the lifecycle. Comparison of the calculated formulas and search for the closest ones to the measured also discussed. We give recommendations for calculating mean velocity of mudflows at any time during its moving.
Thermal conditions of systems for solar thermal regeneration of adsorbents
Authors: Khuzhakulov Saydullo , Pardaev Zokir , Khamraev Sardor 
Published: January 2021

Abstract
Energy supply of fruit and vegetable storages, especially in those remote from the centralized energy supply using solar energy, is relevant. The authors of the article propose a system of thermal regeneration of adsorbents based on the use of solar energy. The paper presents studies of heat transfer and thermal regime of the developed system of solar-thermal regeneration of the adsorbent (activated carbon) in non-stationary mode. The results of the study of heat transfer and thermal regime of systems for solar-thermal regeneration of adsorbents (activated carbon) under unsteady conditions are presented. A mathematical model of the temperature field of the adsorbent layer during solar heating using a solar air collector is proposed. The proposed mathematical model of the thermal regime of the solar adsorption installation allows you to qualitatively control the technological process of thermal regeneration of adsorbents and significantly reduce the cost of traditional energy resources.
Physical and electronic model of studying infrared radiator for drying wending insulation
Authors: Denmukhammadiev Aktam , Pardaev Abror , Begmatov Murodjon , Mustafoqulov Almardon , Valikhonova Himolakhon 
Published: January 2021

Abstract
During a long shutdown of the motors, the insulation quality of the windings of asynchronous motors deteriorates due to moisture. This requires additional costs for drying the insulation of electrical machines. The signs and possible causes of malfunctions of electrical machines, as well as methods of drying insulation, are studied: Drying by external heating, Drying by heating from an external source, Convective drying, Drying by induction loss, drying using light emitters. Drying using infrared radiation is the mildest method and helps to maintain the quality of the insulation. The movement of moisture in the layers of insulating windings occurs according to the laws of heat-mass exchange, that is, heat and moisture are simultaneously transferred. In this case, heat is transferred from more heated layers to less heated layers and at the same time promotes moisture transfer. A physical and electronic model was developed to study the effect of infrared radiation on the drying process of insulation of electrical machines. The main factors influencing the process under consideration are the power of the radiation sources and the supply voltage, that is, the temperature changes in the layers of the insulated windings were studied depending on the change in the power of the emitters and the supply voltage. The created model was investigated according to the main features corresponding to the real process (even the geometrical dimensions coincide). An indispensable condition for physical modeling is the strict geometric similarity of the model and nature, as well as the equality of the corresponding similarity criteria in them.
Energy absorption characteristics of honeycomb materials with negative poisson’s ratio*
Authors: Yan Xiaonan , Wang Rong , Chen Yongxiong , Cheng Yanhai , Liang Xiubing 
Published: January 2021

Abstract
Using a combination of finite element numerical simulation and experimental verification, the honeycomb structure with different parameters of negative Poisson’s ratio is compressed at a uniform speed. The influence of angle parameter θ, size parameter h and thickness parameter t on Poisson’s ratio and energy absorption of the whole structure is studied, and the main factors influencing Poisson’s ratio and energy absorption are discussed. The results show that the larger concave angle, the smaller size and the larger thickness of the honeycomb cell, the better energy absorption of the overall structure, and the angle is the parameter that has the greatest influence on the Poisson’s ratio and energy absorption. Meanwhile, it is demonstrated that the honeycomb hybrid auxetic material has better energy absorption.
Ternary mixed-oxide synergy effects of nano TiO2-FexOy-MOk (M = Mn, Ce, Co) on α-pinene catalytic oxidation process assisted by nonthermal plasma
Authors: Gao Yan , Peng Xiaoying , Zhang Zhanchao , Zhang Wenke , Li Hui , Chen Baoming , Li Shijie , Zhang Yixue , Chi Shidan 
Published: January 2021

Abstract
Biomass fuel from plant waste is an important substitute for fossil fuels. The odorous volatile organic compounds (VOCs) is released during the drying process of biomass, which causes harm to the ecological environment and human health. The α-pinene is a typical odorous VOC generating during plant waste drying. Ternary nanocatalyst composed of TiO2, Fe
x
O
y
and MO
k
(M = Mn, Co, Ce) was manufactured by ultrasonic assisted hydrothermal process. The α-pinene catalytic oxidation property of ternary nanocatalysts were investigate in a dielectric barrier discharge reactor assisted by nonthermal plasma. The pore structure parameters of ternary nanocatalysts were observed qualitatively and analyzed quantitatively by transmission electron microscopy (TEM) and N2 adsorption test, respectively. The phase composition and active element valence of these three kinds nanocatalysts were analyzed and compared by X-ray diffraction (XRD) and X-ray Photoelectron spectroscopy (XPS). The test data showed TiO2-Fe
x
O
y
-CoO
k
ternary nanocatalyst had more complete microporous and mesoporous pore structure, better element dispersion and stronger redox performance. Meanwhile, TiO2-Fe
x
O
y
-CoO
k
sample had the best performance with α-pinene catalytic conversion achieving 83.3% and CO2 selectivity higher than 90% at specific energy density (SED) of 620 J·l−1, which was almost half of the energy consumption of single non-thermal plasma catalytic reaction during the nonthermal plasma-catalyst (NTP-C) synergistic catalytic activity experiments. At the same time, the ternary nanocatalysts could obviously reduce the generation concentration of O3 and NO
x
in the process of α-pinene catalytic oxidation. The synergy effect between TiO2, Fe
x
O
y
and CoO
k
was better than that of TiO2, Fe
x
O
y
and CeO
k
or MnO
k
. It could be expected as an effective method to improve the redox performance of ternary nanocatalysts by optimizing the microstructure and elemental composition, which would also be a promising way to enhance odorous VOCs catalytic oxidation efficiency and reduce the energy consumption in the NTP-C synergistic catalytic system.
Mechanical and sound absorption performance of addition type liquid silicone rubber reinforced with halloysite nanotubes
Authors: Peng Longgui , Lei Lei , Liu Yongqiang , Du Lifei 
Published: January 2021

Abstract
Addition-molded room temperature vulcanized liquid silicone rubber (LSR) has become the promising candidate for environmentally friendly sound-absorbing materials, but the absorption efficiency should be further improved. In this study, the Halloysite nanotubes (HNTs) are chosen as the additive with the aim to improve the sound absorption performance of the LSR. Furthermore, the effect of the addition amount of HNTs on the mechanical properties and frequency dependent sound absorption efficiencies are investigated. Results indicate that the fabricated samples show effective high-frequency sound absorption and excellent mechanical properties. The mechanism of the improved sound absorption efficiency in high frequencies is discussed, which is believed to be attributed to the synergistic effect in the multiscale structure: 1) complex interfacial interactions at the surfaces of HNTs; 2) the friction between the air in the cavity and the inner wall of HNTs. Therefore, introducing the HNTs into the traditional silicone rubber would be an efficient way to improve the absorption efficiency for high frequency sound waves.
Associations Between Postpartum Depressive Symptoms and Couples’ Sexual Function and Sexual Distress Trajectories Across the Transition to Parenthood
Authors: Dawson Samantha J , Leonhardt Nathan D , Impett Emily A , Rosen Natalie O 
Published: January 2021

Abstract

Background
The transition to parenthood is associated with changes to new parents’ mood and sexual health. Sexual dysfunction—problems with sexual function accompanied by sexual distress (i.e., worries and concerns about one’s sex life)—is linked to poorer overall health, yet few studies have examined how sexual dysfunction unfolds for couples during this transition. Postpartum depression is a risk factor for sexual dysfunction; however, the association between depressive symptoms and how postpartum sexual dysfunction evolves has not been examined.

Purpose
To establish trajectories of sexual function and sexual distress for mothers and partners and to examine if postpartum depressive symptoms were associated with these trajectories.

Methods
Data were collected from 203 first-time parent couples from midpregnancy until 12-months postpartum. Sexual function and sexual distress were assessed at six time points (two prenatal) and depressive symptoms were assessed at 3-months postpartum.

Results
Dyadic latent piece-wise growth curve models revealed significant declines in mothers’ and partners’ sexual function between pregnancy and 3-months postpartum and significant improvements from 3- to 12-months postpartum. Mothers’ sexual distress increased between pregnancy and 3-months postpartum and decreased thereafter, whereas partner’s sexual distress remained stable. Depressive symptoms were associated with poorer sexual function and higher sexual distress at 3-months postpartum for both partners but did not predict change over time.

Conclusions
Mothers and their partners experience changes to their sexual function during the transition to parenthood; however, mothers are at greater risk of sexual dysfunction. Depressive symptoms are a risk factor for poorer sexual health at 3-months postpartum for both parents.
The non-coding epitranscriptome in cancer
Authors: Miano Valentina , Codino Azzurra , Pandolfini Luca , Barbieri Isaia 
Published: January 2021

Abstract
Post-synthesis modification of biomolecules is an efficient way of regulating and optimizing their functions. The human epitranscriptome includes a variety of more than 100 modifications known to exist in all RNA subtypes. Modifications of non-coding RNAs are particularly interesting since they can directly affect their structure, stability, interaction and function. Indeed, non-coding RNAs such as tRNA and rRNA are the most modified RNA species in eukaryotic cells. In the last 20 years, new functions of non-coding RNAs have been discovered and their involvement in human disease, including cancer, became clear. In this review, we will present the evidence connecting modifications of different non-coding RNA subtypes and their role in cancer.