bluuebunny/crossref_metadata_2025 huggingface dataset:
3D nanostructured Ce-doped CoFe-LDH/NF self-supported catalyst for high-performance OER
Authors: Wang Lu , Liu Yi , Liu Xiaoheng , Chen Wei
Published: August 2023

Ce-doping CoFe-LDH nanoneedles were prepared, possessing Ce3+ and CoFe reaction centers. The promising results are obtained, including a superior low overpotential at 10 mA cm−2 of 225 mV and an outstanding Tafel slope of 34.34 mV dec−1.
Stretching the chains: the destabilizing impact of Cu2+ and Zn2+ ions on K48-linked diubiquitin
Authors: Mangini Vincenzo , Grasso Giulia , Belviso Benny Danilo , Sciacca Michele F. M. , Lanza Valeria , Caliandro Rocco , Milardi Danilo
Published: August 2023

Cu2+ and Zn2+ ions play distinct roles in destabilizing the K48-Ub2 structure, causing separation of the ubiquitin monomers and highlighting their potential to interfere with Ub signalling.
Crystal water intercalated interlayer expanded MoS2 nanosheets as a cathode for efficient zinc-ion storage
Authors: Hariram Muruganandham , Kumar Manoj , Awasthi Kamlendra , Sarkar Debasish , Menezes Prashanth W.
Published: August 2023

Efficient zinc-ion storage in water intercalated MoS2 nanosheets with enlarged interlayer spacing.
Investigation of the luminescence properties and energy transfer mechanisms in Gd3TaO7:Bi3+,Eu3+ phosphors for their potential application in full-spectrum WLEDs
Authors: Liao Zhicheng , Qiu Liting , Zhang Qian , Wei Xiantao , Chen Yonghu , Yin Min
Published: August 2023

In Gd3TaO7:0.01Bi3+,yEu3+, the tuning of light from blue and green to red under UV excitation was achieved by adjusting the concentration of Eu3+, and a single-phase white phosphor suitable for a 365 nm LED chip was successfully synthesized.
A series of polyoxometalate-based COF composites by one-pot mechanosynthesis of thioether to sulfone
Authors: Guo Yanyan , Liu Xiaohui , Liu Xiaodong , Xu Na , Wang Xiuli
Published: August 2023

An effective combination of polyoxometalates (POMs) and porous materials is a feasible method to solve the homogeneity of POMs and synthesize extremely stable POM-based catalysts.
Reverse osmosis membrane-based pretreatment for the quantification of N-nitrosodimethylamine concentrations in high-matrix water samples
Authors: Kodamatani Hitoshi , Kubozono Karin , Kanzaki Ryo , Tomiyasu Takashi , Fujioka Takahiro
Published: August 2023

RO treatment was utilized as a pretreatment method to remove interfering substances in high-matrix water samples for NDMA measurements.
A fluorescent N-doped carbon dot-hydrogel composite for concurrent selective detection and local hot spot promoted adsorption of uranium(vi)
Authors: Wang Qun , Han Tao , Miao Caiqin , Qin Wei , Wu Xiaohong
Published: August 2023

N-doped carbon dot-embedded cellulose-based fluorescent hydrogel composite (CMH–NCDs) with 3D hydrophilic hierarchical pore network and confined convection exhibited concurrent selective detection and adsorption of uranium(vi) from nuclear water.
Avidin triggered turn-on NIR-fluorescent aza-BODIPY-biotin self-assemblies for cancer cell imaging
Authors: Dutta Dhiraj , Nair Rajshree R. , Kayastha Nasib , Nair S. Asha , Gogoi Pranjal
Published: August 2023

Aza-BODIPY biotin-based nano-self-assembly has been designed for selective NIR turn-on fluorescence activity against cancer cells.
Synthesis of reticular long-carbon-chain polysiloxane and its hydrophobic modification of phosphogypsum-based materials
Authors: Yang Guang , He Songtao , Li Yuanxia , Li Yi , Li Zegang , Song Weixiang , Chen Zhonghua , Liu Qibin
Published: August 2023

Synthesis of reticular long-carbon-chain polysiloxane and hydrophobic modification of phosphogypsum by internal-mixing for the comprehensive utilization of solid waste.
Fluorescent cadmium(ii) metal–organic frameworks exhibit excellent stability and detection ability to Fe3+ and MnO4− ions
Authors: Cen Peipei , Ma Tongtong , Jiang Fujunrui , Zhang Fengyuan , He Yanping , Ding Runmei , Tian Danian
Published: August 2023

Cd-MOFs constructed from carboxyl-decorated tetrapoda ligands feature remarkable stability and luminescence property and can be suggested as a selective fluorescence sensor for detecting Fe3+ and MnO4− ions.
Arrays of graphene-quantum dots-supported DNA oligonucleotides as self-indicating porphyrin carriers
Authors: Monteiro Ana R. , Ramos Catarina I. V. , Fateixa Sara , Neves Maria G.P.M.S. , Trindade Tito
Published: August 2023

Several deoxyribonucleic acid (DNA) oligonucleotides able to fold as G-quadruplexes were covalently bound to luminescent graphene quantum dots. The bioconjugates showed higher affinity to carry a cationic porphyrin than non-modified DNA sequences.
Correction: Green synthesis of M-type manganese-substituted strontium hexaferrite SrMnxFe12−xO19 nanoparticles with intrinsic antibacterial activity against human pathogenic bacteria
Authors: Hamarawf Rebaz F. , Tofiq Diary I. , Omer Khalid M.
Published: August 2023

Correction for ‘Green synthesis of M-type manganese-substituted strontium hexaferrite SrMnxFe12−xO19 nanoparticles with intrinsic antibacterial activity against human pathogenic bacteria’ by Rebaz F. Hamarawf et al., New J. Chem., 2023, https://doi.org/10.1039/d3nj03218c.
Industrial total synthesis of natural medicines
Authors: Liu Xiao-Yu , Qin Yong
Published: August 2023

This Viewpoint briefly discusses the progress and outlook of total synthesis in the industrial manufacturing of natural product-based drugs.
Guest exchange in a biomimetic ZnII cavity-complex: kinetic control by a catalytic water, through pore selection, 2nd sphere assistance, and induced-fit processes
Authors: Nyssen N. , Giraud N. , Wouters J. , Jabin I. , Leherte L. , Reinaud O.
Published: August 2023

The kinetics of ligand exchange at a ZnII center confined in a biomimetic environment is studied.
Phosphoric acid-catalyzed asymmetric N-propargylation of pyridazinones and 2-pyridones
Authors: Li Qiongya , Chen Tian , Sun Jiangtao
Published: August 2023

A phosphoric acid-catalyzed regio- and enantioselective N2-propargylation of pyridazinones and 2-pyridones has been achieved.
Bubble detection on the cathode and anode of a high-performing capillary-fed water electrolysis cell
Authors: Hoang Anh Linh , Owen Rhodri E. , Tsekouras George , Brett Dan J. L. , Swiegers Gerhard F.
Published: August 2023

The cathode and anode of a ‘bubble-free’ ‘capillary-fed’ water electrolysis cell that was previously reported to consume only 40.4 kW h kg−1 hydrogen under commercial operating conditions, have been separately investigated for gas bubble formation.
Swelling characteristics of DNA polymerization gels
Authors: Fern Joshua , Shi Ruohong , Liu Yixin , Xiong Yan , Gracias David H. , Schulman Rebecca
Published: August 2023

We investigate how the swelling of stimuli-responsive DNA polymerization gels can be modulated by adjusting the sequences and concentrations of DNA crosslinks and hairpin triggers, ionic strength of the solution, and gel size and shape.
z-GAL: A NOEMA spectroscopic redshift survey of brightHerschelgalaxies
Authors: Ismail D. , Beelen A. , Buat V. , Berta S. , Cox P. , Stanley F. , Young A. , Jin S. , Neri R. , Bakx T. , Dannerbauer H. , Butler K. , Cooray A. , Nanni A. , Omont A. , Serjeant S. , van der Werf P. , Vlahakis C. , Weiß A. , Yang C. , Baker A. J. , Bendo G. , Borsato E. , Chartab N. , Dye S. , Eales S. , Gavazzi R. , Hughes D. , Ivison R. , Jones B. M. , Krips M. , Lehnert M. , Marchetti L. , Messias H. , Negrello M. , Perez-Fournon I. , Riechers D. A. , Urquhart S.
Published: August 2023

We present the dust properties of 125 brightHerschelgalaxies selected from thez-GAL NOEMA spectroscopic redshift survey. All the galaxies have precise spectroscopic redshifts in the range 1.3 <z< 5.4. The large instantaneous bandwidth of NOEMA provides an exquisite sampling of the underlying dust continuum emission at 2 and 3 mm in the observed frame, with flux densities in at least four sidebands for each source. Together with the availableHerschel250, 350, and 500 μm and SCUBA-2 850 μm flux densities, the spectral energy distribution (SED) of each source can be analyzed from the far-infrared to the millimeter, with a fine sampling of the Rayleigh-Jeans tail. This wealth of data provides a solid basis to derive robust dust properties, in particular the dust emissivity index (β) and the dust temperature (Tdust). In order to demonstrate our ability to constrain the dust properties, we used a flux-generated mock catalog and analyzed the results under the assumption of an optically thin and optically thick modified black body emission. The robustness of the SED sampling for thez-GAL sources is highlighted by the mock analysis that showed high accuracy in estimating the continuum dust properties. These findings provided the basis for our detailed analysis of thez-GAL continuum data. We report a range of dust emissivities withβ ∼ 1.5 − 3 estimated up to high precision with relative uncertainties that vary in the range 7%−15%, and an average of 2.2 ± 0.3. We find dust temperatures varying from 20 to 50 K with an average ofTdust ∼ 30 K for the optically thin case andTdust ∼ 38 K in the optically thick case. For all the sources, we estimate the dust masses and apparent infrared luminosities (based on the optically thin approach). An inverse correlation is found betweenTdustandβwithβ ∝ Tdust−0.69, which is similar to what is seen in the local Universe. Finally, we report an increasing trend in the dust temperature as a function of redshift at a rate of 6.5 ± 0.5 K/zfor this 500 μm-selected sample. Based on this study, future prospects are outlined to further explore the evolution of dust temperature across cosmic time.
The Study of Modification of PVC-materials by Rice Husk Ash Including Activated by Cationic Surfactant and Wollastonite on Its Basis
Authors: Gotlib Elena , Sadykova Dilyara , Sokolova Alla , Cherezova Elena
Published: August 2023

This article examines the use of waste rice processing as a promising fillers for PVC finishing materials. Due to the presence of amorphous silicon dioxide these fillers improve the performance properties of filled PVC, while lignin and cellulose in their composition accelerate biodegradation when buried in the soil. The use of these wastes allows solving the problems of “green” chemistry and closed-cycle economy and reducing the cost of finished polymer products. The paper studies the effect of ash of rice husk and synthetic wollastonite on its basis on the diffusion processes occurring during mixing of PVC and plasticizer. Activation of the RHA surface by CATAPAV significantly affects its elemental and particle size distribution and structure porosity, leading to a decrease in the porosity of the filler, reducing its particle size and narrowing the distribution of particles and pores in size. At use of silicate fillers of optimum composition growth of tensile strength, thermal stability and decrease of plasticizer migration from PVC compositions, owing to plasticizer retention in pores of these fillers is reached.
Universal slabs for hydro- and heat insulation
Authors: Lyapidevskaya Olga
Published: August 2023

The article deals with the creating of a universal material for protecting underground structures from groundwater as well as providing their thermal protection. The article presents a method for waterproofing and drainage of underground walling structures using drainage slabs made of filtration polystyrene foam and considers the possibility of using these slabs for reducing heat losses of heated underground structures. Thermal engineering characteristics of filtration polystyrene foam are determined, and calculations of heat losses of underground walling structures with slabs made of this material are given. The results of studies of the kinetics of water drainage by filtration polystyrene slabs are shown. The dependence of the heat conductivity of filtration polystyrene on humidity and other factors are also presented. Calculations of heat losses through the walls of heated underground premises are given, taking into account the temperature distribution in the ground along the depth of the structure. A comparative analysis of heat losses with the use of filtration polystyrene foam slabs and without them has been carried out. Based on the experimental results obtained, it was revealed that filtration polystyrene foam has not only high filtration characteristics, but is also an effective material for thermal protection of underground structures.
Composition and Properties of Fine-grained Concrete for Self-cleaning Coatings
Authors: Ogurtsova Yulia , Antonenko Marina , Gubareva Ekaterina , Nerovnaya Sofya , Strokova Valeria
Published: August 2023

The paper considers the dependences of the properties of self-cleaning fine-grained concrete on the composition of the concrete mixture: the ratio of sand to white Portland cement, the content of plasticizer, the content of photocatalytic composite material. The photocatalytic composite material (PCM) is a diatomite-based anatase-silica material obtained by sol-gel deposition of nanoscale TiO2 of anatase modification on a silica carrier. The investigated properties of fine-grained concrete were: average density, compressive strength and self-cleaning ability, which was determined by evaluating the photocatalytic decomposition of an organic dye – Rhodamine B. It was shown that an increase in the content of PCM to increase the ability of the coating to self-cleaning leads to a loosening of the structure of fine-grained concrete, but this can be successfully offset by an increase in the content of plasticizer, which additionally improves the distribution of the photocatalytic agent in the cement-sand matrix. An increase in the proportion of sand and the content of plasticizer also contribute to an increase in the ability to self-cleaning. The pozzolan activity of the PCM provides an increase in the strength of concrete. The results of comparing the self-cleaning ability of fine-grained concrete of various compositions indicate a high photocatalytic activity of samples with PCM, which allows its application for creating self-cleaning coatings.
Shrinkage of frame polymer concretes in road construction
Authors: Korneeva A.O. , Bondarev B. A. , Kosta A.A. , Meshcheryakov A.A. , Korneev O.O.
Published: August 2023

It is known that with the same raw material composition, it is possible to obtain different structures of composite materials. So, for example, polymer concretes can be made using traditional technology and the method of phase-by-phase forming. At the same time, frame technology reduces material consumption without loss of strength properties and increases durability. Polymer composite materials of phase-forming by combining properties viscoelastic binder and rigid matrix. It has highly damping performance. The article considers the possibility of using the frame structure polymer composite material in road construction. The composition is also considered, the advantages are determined and a comparison with traditional materials is made. The shrinkage stresses of polymer concrete that occur during the polycondensation reaction of furan resin are quite large and can exceed the permissible ones, which leads to a violation of the monolithic nature of the structure due to the appearance of micro- and macrocracks. In this work, the kinetics of shrinkage within 28 days was studied. The composition of the frame polymer composite material includes the following components: furfural acetone monomer (FAM resin), benzosulfonic acid, granite crushed stone, andesite flour, quartz sand. Theshrinkage of phase-formed polymer concrete was measured on samples hardening under normal temperature-humidity conditions. The generally accepted technique was used, shrinkage deformations were installed along the axis of the sample on two opposite faces with a clock-type indicator with a division price of 0.001 mm. Also in the work is a diagram of the device for determining the deformations of the shrinkage of samples and the results of the study are given. Experimentally established the intensity of shrinkage, which manifests itself in the first three days of curing, in the future its change is insignificant and by the seventh day it fades. According to the test results, it was established that the linear shrinkage of frame polymer concretes is three times less than the shrinkage of polymer concretes with a conventional structure.
Stress-optical coefficients of copolymers
Authors: Matseevich Tatiana , Matseevich Andrey , Askadskii Andrey
Published: August 2023

The stress-optical coefficientCσof copolymers based on cured epoxy resins has been calculated. Calculations were made for epoxy resins based on bisphenol A and aliphatic and aromatic diamines. TheCσvalues are in the range of 91.6÷103 weight percent. All calculations were carried out using the Cascade computer program (developed by INEOS RAS). The investigated structures of cured epoxy resins are obtained from industrial components. HighCσvalues make it possible to confidently use the mentioned network polymers in the photoelasticity method, from which models of full-scale building structures can be made.
Deformation parameters of high-strength steel fiber concrete under long-term load application
Authors: Kapustin Dmitrii
Published: August 2023

This article contain an experimental study of the rheological characteristics of high-strength steel fiber concrete (SFRC) that is used for the manufacture of permanent formwork. Permanent SFRC formwork is used in the construction of reinforced concrete structures of new generation nuclear power plants (NPP), where due to improved physical and mechanical characteristics it is used as a load bearing element. As a result, a structure with combined reinforcement is obtained, requiring improvement of existing calculation methods, including continuously acting load. The use of existing models of concrete behavior under conditions of continuous loading using SFRC is limited and requires experimental refinement. Studies in the field of nonlinear creep, where, according to a number of studies, the use of steel fibers is most effective are of a particular interest. The high labor intensity and duration of creep tests limited the research to two compositions of SFRC recommended for the manufacture of formwork and fine-grained matrix. Based on the established rheological characteristics at loading levels 0.3, 0.8, 0.85 and 0.9, analytical dependences that allow predicting the values of creep strain at different loading levels are obtained. The presented dependences are recommended for the calculation of reinforced concrete structures with non-removable formwork made of SFRC under a long-term load.
Mechanical safety of reinforced concrete structures at all stages of the life cycle
Authors: Terekhov Ivan A. , Trekin Nikolay N. , Kodysh Emil N. , Shmakov Sergey D.
Published: August 2023

Ensuring the mechanical safety of operated buildings at all stages of the life cycle is an urgent task. This is especially important when planning major repairs and reconstruction in buildings, as well as determining the period of safe operation from the moment of the survey, i.e. clarification of the remaining service life.

The total service life at the design stage is set by the customer and the general designer in accordance with the recommendations of GOST 27751-2014 «Reliability for constructions and foundations. General principles». Mechanical safety and durability are ensured when calculating structures using the limit state method, assigning protection measures depending on the operating conditions, as well as complying with the requirements of SP 255.1325800.2016 «Buildings and structures. Operating rules. General Provisions».

A method for preliminary assessment of the mechanical safety of buildings and their structures is proposed for consideration, which eliminates some of the shortcomings of existing methods for calculating the residual life by physical wear (damage) of building structures based on the results of a visual inspection, the basis of which is the dependence of the allowable safe operation period on the percentage of reduced bearing capacity. It is proposed to use the results of a visual inspection performed in accordance with GOST 31937-2011 «Buildings and constructions. Rules of inspection and monitoring of the technical condition».
Monitoring of geotechnical and underground construction facilities as part of risk management
Authors: Chunyuk Dmitry , Selviyan Serafima
Published: August 2023

Any construction of geotechnical and underground facilities is associated with risk factors. In order to manage these factors, a list of measures to reduce them must be provided at the project stage. One of the main measures is monitoring. The article describes an effective method of risk management by means of monitoring and scientific and technical project management, classifications of potential hazards for aboveground and underground construction are given. Using color gradation in tabular form the categories of hazards are given and the regulations and actions to reduce them are described. This paper describes in detail the results obtained at real objects during risk management by means of monitoring and scientific and technical support at each stage of construction.
Ground Slope Stability Analysis
Authors: Gandelsman Igor
Published: August 2023

The article analyzes the engineering and geological conditions of the right bank, which is in a state of dynamic equilibrium, of the Oka River. Calculation schemes have been compiled to perform calculations of the total static stability of the slope for two calculated cases in the existing natural state and taking into account the water saturation of the water-bearing rocks, the boundaries of the landslide zone for various cases have been determined. The article identifies possible risks, analyzes the main models of the behavior of the soil base taking into account negative factors, calculates the stability of soil massifs using various known methods. The geometric scheme of the computational model was built on transverse profiles. The width of the calculated area was chosen in such a way that there were no changes in the stress-strain state of the array due to the introduction of artificial boundary conditions along the edges of the finite element grid. The method of calculating stability based on numerical modeling programs by reducing strength characteristics has a number of advantages over the traditionally used methods of calculating stability based on the equations of limiting equilibrium. Based on the results of calculations, the boundaries of the landslide zone for various cases were determined by the method of circular cylindrical sliding surfaces (SAM). A potential landslide zone has been identified, including residential development. Based on the calculations performed, it is proposed to provide alternative measures to ensure the safety of buildings falling into a landslide zone to ensure reliable fastening and minimal impact on the existing slope.
Dynamic behavior of a compressed reinforced concrete column with regard to the loading prehistory
Authors: Savin Sergey , Sharipov Manonhodja
Published: August 2023

In recent years, numerous studies of the resistance of structural systems and their substructures to progressive collapse in case of failure of a load-bearing element have been conducted all over the world. Aspects of resistance to progressive collapse of reinforced concrete frames that have not been investigated to date include the consideration of changes in the mechanical and deformational characteristics of the material over time. Therefore, in this study, the analytical solution of the problem of longitudinal bending of a compressed reinforced concrete element under dynamic loading taking into account the initial stress-strain state from the preceding long-term loading based on the viscoelastic model is constructed. Numerical solution of the problem by the Runge-Kutta method is considered. It was found that the calculation results for different integration steps turned out to be similar. However, the calculation results for the integration step of 0.005 s differed by 22.3% from the calculation results for the step of 0.001 s. The difference in the calculation results for integration steps of 0.001 and 0.002 s did not exceed 1.3%.
Check of stress values in reinforcement and joints of wall panels
Authors: Korol Elena , Kustikova Yuliya
Published: August 2023

The exterior walls of buildings are subjected to not only forces but also thermal shrinkage effects. These effects are particularly significant for buildings constructed using single-layer and three-layer panels. Temperature forces and deformations occur both within the plane of the outer walls and outside of it. As a result, it is necessary to conduct calculations to ensure that the design solutions for exterior walls made of single-layer and laminated panels are both strong and deformable. These calculations are necessary for frameless buildings with a regular structural scheme. By conducting these calculations, it is possible to verify that the design solutions for exterior walls can withstand the forces and deformations that they will experience during their lifetime.
Strength and deformability models of cellular structure shells at static and short-term dynamic loading
Authors: Utkin Dmitry
Published: August 2023

The paper presents the results of a comprehensive experimental and numerical study of the destruction of reinforced beams made of concrete and fibroconcrete under short-term dynamic action. Experimental studies on were carried out on a copra rig. A short-term dynamic load on the beam was created with the help of a falling load weighing 450 kg from a height of 700 mm. In experiments, the magnitude of the dynamic load was determined using a force gauge sensor, linear displacement sensors were used to calculate linear displacements. Numerical modeling is carried out in a full three-dimensional dynamic formulation within the framework of the phenomenological approach of continuum mechanics with the explicit allocation of reinforcing elements. For the numerical solution, the finite element method is used, modified to solve dynamic problems. In the calculations, the impact of the load on the beam was replaced by an impulse. The dependence of the pulse on time was determined from the experiment. The effect of reinforcement on the deformation and destruction of the beam is investigated. The comparison of experimental and numerical results is carried out.
Engineering structures stability against progressive collapse
Authors: Telichenko Valeriy , Rimshin Vladimir , Ketsko Ekaterina
Published: August 2023

The calculating stability of an engineering structure against progressive collapse is considered in this article. The calculations results are analyzed. A dangerous emergency scenario was developed and measures were developed to prevent the progressive building collapse in the structures local destruction in accordance with the regulatory documents requirements for such an object. The most dangerous design schemes are considered to assess the structure stability against progressive collapse. A scenario for calculating stability against progressive collapse in the case of local failure has been selected, and a consistent action algorithm has been obtained that makes it possible to perform a calculation for resistance to progressive collapse., The kinematic method of the limit equilibrium theory for structures with elastic-plastic materials properties is used to calculate the resistance to progressive collapse. It corresponds to the turning the system into a plastic kinematic chain, the links movement is carried out due to the plastic flow of the system's links. Two types of undamaged structures were identified to assess the building resistance to progressive collapse: neighbouring beams and columns, in which local destruction impact does not cause a qualitative change in the stress state, but leads to an increase in stresses and forces (neighboring beams, columns); pavement slabs resting on a beam and welded through embedded parts to a beam that has lost its original support, and located above a local fracture, the stress state changes. The conclusion is made about the requirements that should be met in order to conclude the calculation justification so it can be said that resistance to progressive collapse is ensured. It has been established that the calculations performed confirm the object stability - the drainage chamber to progressive collapse in the local destruction as an emergency situations result.
Determination of electric and dielectric conductivity of fruits and vegetables
Authors: Kurbonov J. M. , Yusupov Sh. J. , Holiqova M. , Mahmadiyarova Y. N.
Published: August 2023

The article describes the research results to determine fruits and vegetables’ electrical and dielectric conductivity. The electrical conductivity is characterized, and the experimental method of its determination and the equipment used are given. Also, the topic’s relevance, keywords, methods of calculation in the experimental process, the electrical conductivity of crushed, cut varieties of fruits (apricots, apples, plums) and carrots, and the results of a study to determine the dielectric constant. MevaThe results of the dielectric properties of tula and cut varieties of different sizes (apricots, apples, plums) and vegetables (carrots, potatoes, beets, and onions) are presented. The curves of the dependence of the specific electrical conductivity of crushed fruits, plums, apples, and carrots on the EMF voltage are obtained. The specific electrical conductivity at cm is a maximum of 0.191 cm / m. Also, during the operation of the electrodes in the cell -30 s, the electrical conductivity first increases rapidly; after 10 seconds, the growth decreases, and at a certain maximum time - 18 s decreases, and the maximum size here is in the range of 0.209 to 0.230 cm/cm. The temperature dependence of the specific electrical conductivity of fruits and vegetables greatly affects their temperature on electrical conductivity.
The effectiveness of use of water-saving technologies against erosion in hilly areas land
Authors: Rakhmonov Dilshod , Yuldoshev Khushnudbek , Khalikov A.
Published: August 2023

Reducing irrigation erosion is one of the major challenges in the world today. Particular attention is paid to the development and maintenance of soil fertility and the development of irrigation water-saving technologies. Soil erosion due to over-irrigation of arable land on farms leads to increased fertilizer consumption and decreased productivity. The washing of the fertile layer of soil not only affects the yield of crops but also affects the mechanical composition of the soil. Erosion destroys the natural topsoil, and a reduction in organic matter accompanies this. When erosion occurs, soil particles are lost, and organisms, mineral fertilizers, and nutrients are lost along with them. Currently, the average soil washing before irrigation in such an area is 51 t/ha per year, of which nutrients are: humus 590 kg/ha, nitrogen, and phosphorus -50 and 82 kg/ha, potassium 140 kg/ha, and small elements 33 kg/ha. e. Of these, 600 thousand are currently strongly washed soils - 39 thousand, average washed - 215 thousand, and weakly washed soils - 346 thousand. As a result of soil washing and lowering the quality of wetting of sloping lands, the gross yield of 28-47 % decreases in crop areas. Resolutions decree of the President-4919 of December 11, 2020, “On measures to further accelerate the introduction of water-saving technologies in agriculture”, as well as Resolution No. PF-6024 of July 10, 2020, of the President of the Republic of Uzbekistan The program of decrees “Concept for 2030” is being implemented. With economic irrigation technology using K-9 polymer in furrow irrigation, the water use coefficient in irrigation changed from 0.78 to 0.87 in furrows, from 0.7 to 0.76 under control. The water economy during the irrigation season is 400-878 m3/ha. Fuel economy in plowing was 3-4 liters per hectare. The number of swimmers has halved. K-9 polymer using furrow irrigation increased yields from 28.4 to 68.4 and 70 quintals per hectare.
Synthesis and characterization by experimental and theory research suitable on the CdS and CdO materials
Authors: Sapaev I. B. , Boltaev G. S. , Sapaev B. , Abdullayev J. Sh. , Sadullaev S. , Khasanov F. Kh. , Akhmedjonov N. O.
Published: August 2023

In this paper, we have compared and analyzed experimental and theoretical research on A2B6 types semiconductor materials CdS and CdO. The XRD spectra of the samples were examined using an atomic force microscope and X-ray diffraction microscopy. During film deposition, the temperature of the crucible with a source (CdS) varied in the range Tsourse ≈ 800 ÷ 850°C, and the substrate temperature was maintained within the range Tp ≈ 250 ÷ 270°C. In this case, to ensure the reproducibility of the structures, a shutter was used, with the help of which the CdS deposition time was set, which ensured that the film thickness was the same from experiment to experiment.
Study of the electro and thermophysical properties of composite ceramic materials containing nickel nanoparticles
Authors: Umarov A. , Abdurakhmanov U. , Raximova Ya. , Karaboeva M. , Saidqulov D. , Boymuratov F.
Published: August 2023

The regularities in the behavior of the electrophysical and some thermophysical properties of composite ceramic materials containing both micro- and nanoparticles of nickel in the region of the percolation threshold have been studied. Certain regularities in the behavior of the electrical conductivity, dielectric constant, thermal conductivity, and thermoelectric power of composite ceramic materials as a function of the volume content of nickel particles are revealed. Near the percolation threshold, the experimental results of the behavior of the electrical conductivity and static permittivity as a function of the nickel volume content in these materials differ from the dependences calculated within the framework of the percolation theory in that the curve of the dependence of the permittivity has the form similar to the electrical conductivity curve. The origin of this discrepancy is explained by the formation of a continuous spatial structure of tunnel-connected conductors.
Uniform Domain Equilibrium Equation with Finite Deformations
Authors: Frishter Lyudmila , Saad Subhi Al-Gburi Noora
Published: August 2023

In corner areas of structures, high stress values and gradients occur, and lead to stress concentrations. Infinite stress and deformations are determined by a solution of the linear elasticity theory problem in the area with a wedge-shape boundary notch. Infinite solutions of the elasticity problem occur under impact of forced deformations, when a surge of the deformation value reaches beyond the area boundary. Relative values of stress concentrations for corner area zones make no more sense. At finite displacements, high deformation and stress values occur in the corner zones of the area. For a linear statement of the elasticity theory problem, at minor deflections, not only first-order, but also second-order derivatives of the displacements function are significant. To account for finite deformations of such corner zones of the area, correct formulations of elasticity problems are required. Study objective: influence determination of the infinitesimal order of the deformation on the appearance of equilibrium equations of an area with induced (temperature) deformations. This allows for the analysis of the influence of linear, shear deformations, and of the swing on the solution of the elasticity problem with induced deformations.
Bilinear Model of Behavior Reinforced Concrete Column under High-intensity Lateral Loads after Fire
Authors: Tamrazyan Ashot , Chernik Vladimir
Published: August 2023

The experience of destructive earthquakes shows that the problem of determining the response of RC frames under seismic loads after a fire is relevant. Calculation models for individual elements and buildings as a whole should reflect nonlinear behavior in this case. A brief review of models for describing reinforced concrete elements under low-cycle loads is given. It is noted that such models for elements damaged by fire do not exist at present. A model based on a bilinear diagram for calculating an eccentrically compressed RC column damaged by fire is proposed. Only three parameters are required to describe the model: the ultimate moment, the ultimate curvature, and the effective initial stiffness. The ultimate moment and curvature are determined by analyzing the distribution of stresses and strains in the column cross-section during the fracture stage. The column cross section is represented by a set of separate layers heated to different temperatures. The effective stiffness is defined by a straight line passing through the point in the curvilinear diagram where the initial yielding in the reinforcement or concrete occurs. The model takes into account different levels of axial loading, indirect reinforcement by transverse hoops, second-order effects and non-uniform distribution of stresses in the compressed zone of concrete. On the basis of the proposed model, bilinear deformation diagrams of RC columns, which are subjected to standard fire of different duration, are compared. The calculation results have shown a significant decrease in bearing capacity and stiffness of the damaged columns and an increase in their plasticity. The resulting model is simple enough to be used and suitable for most engineering calculations. This model can be used as a basis for constructing a hysteresis diagram for low-cycle impacts after a fire, which is necessary for seismic analysis of structures in the time domain.
Model and field tests of drilled displacement system piles
Authors: Zhussupbekov A. , Dhanya J.S. , Issakulov A. , Omarov A. , Iskakov S. , Mukhanov D.
Published: August 2023

Drilled Displacement System (DDS) and Continuous Flight Auger (CFA) piles are two popular techniques used for building pile foundations that offer advantages over traditional pile systems, including improved load-carrying capacity, reduced installation time, and less spoil generation. This article presents laboratory-scaled model tests conducted on model piles installed using the Drilled Displacement System (DDS) and Continuous Flight Auger (CFA) technologies on a test tank setup filled with soil. Model piles considering a scaling factor of 1/20 with a diameter of 20 mm and a length of 300 mm were adopted for the study. Static loading is applied to the model piles and the corresponding displacements are measured during each loading phase. The results of the analysis were compared for load-settlement curves and ultimate bearing capacity estimates for both DDS and CFA piles. Based on the study, the DDS piles were observed to perform well in terms of load-carrying capacity compared to the CFA piles. Further, full-scale field tests under static load conditions were carried out on DDS-drilled piles of diameter 400 mm and length 6 m. The load-settlement response from the field test shows good agreement with the model tests. Overall, the results of the study provide valuable insights into the behavior and performance of DDS piles that can be used to optimize their design and installation in different soil types.
Integration of artificial intelligence and video surveillance technology to monitor construction equipment
Authors: Garyaev Andrei , Garyaev Nikolay
Published: August 2023

This article discusses the integration of artificial intelligence (AI) and video surveillance technology for construction equipment management. The use of artificial intelligence algorithms and video surveillance systems can improve equipment management by increasing the efficiency of video surveillance on construction sites, improving the safety and efficiency of construction equipment. The article discusses the potential benefits of using AI to analyze data from video feeds, including the ability to identify anomalies in equipment usage patterns, predict maintenance needs, and optimize equipment utilization. The article provides an example of the practical implementation and use of AI and video surveillance technologies in the construction industry today, highlighting their potential.
Digital approach to construction and demolition
Authors: Aleksanin Aleksandr
Published: August 2023

High-tech digital solutions play a key role in many areas of modern life. The digitalization of construction is at the stage of development and every year it is being introduced more deeply into the industry: regulatory documentation is being developed, digital platforms for interaction between construction participants are being created, and software requirements are being formed. The construction industry needs professionals who will work in a digital information environment throughout the entire life cycle of a building. The level of modern information modeling makes it possible to create a unified digital environment for the development of design solutions, construction management, efficient operation of buildings and their demolition without causing damage to the natural environment. The article discusses digital technologies that accompany the construction and demolition stages of a building's life cycle. An analysis of the requirements for the content of information models is given, the tasks of organizational and technological design are identified, which can be solved through the introduction of a digital construction model. It is proposed to use an end-to-end information flow to ensure the transfer of reliable information between the stages of the life cycle of an object and the formation of information about secondary building resources that can be used in new construction.
Analyzing the Competency of 3D Printing Technology in Architectural, Interior and Product Design
Authors: Arif Kamal Mohammad
Published: August 2023

The new computational technologies and 3D printers have the ability to alter how we construct our surroundings. The additive manufacturing (AM) is a novel way for creating three-dimensional objects by layering materials like plastic, metal, concrete, sand, and other materials. The impact of 3D printing in the construction sector should not be underestimated, as it has the potential to reduce a variety of determining elements such as the construction process, material costs, and the overall project timeline. The 3D printing, allows creating a work of art quickly, easily, and in great detail. 3D printers can create a wide range of objects, including buildings, sculptures, automobile components, toys, shoes, furniture, clothing, weaponry, machines, electronic gadgets, human body parts, and much more. The application of 3D printing in architecture and building construction has evolved from scale modelling to a full-size final product. The paper analyses this novel technology, as well as its possible applications and future prospects. The purpose of this paper is to investigate the use of 3D printing in the architectural, interior and product design sector through newly constructed pioneering examples, research, and discussion of some of the future trends that will make this technology more cost efficient. The systematic literature review has been explored through internet and secondary data from relevant published academic literature from journals articles and research papers. The case study method is used to identify extensive information through an in-depth analysis of existing cases in architectural, interior and product design.
Causes of destruction of gabion retaining walls on coastal areas
Authors: Zhuravlev Roman , Cherkasova Lyudmila
Published: August 2023

The article deals with the design and scheme of gabions destruction in coastal areas under the action of frontal sea waves in the city of Sochi and on the Curonian Spit. The durability of gabions varies depending on the mesh materials, and the place of application. In case of gabion coastal retaining walls, the construction is made of metal and anticorrosive coated wire with an additional polymer coating, their durability is claimed to be several dozens of years but observations show that the structure may be destroyed much earlier. The actual scheme of destruction of these structures differs from those given in the regulatory documents. In spite of their possible destruction gabions prevent the development of landslide and suffusion processes along the coastline during their short lifetime. The article deals with the problems of gabion retaining walls failure under the influence of frontal sea waves which are not stipulated in the normative documents.
Application of the reliability assessment results for pumping stations’s modernization
Authors: Kan Eduard , Li Marina , Khushvaktova Khusnobod , Khamroyeva Marguba , Khujamkulova Khosiyat
Published: August 2023

Work on the modernization of irrigation pumping stations in our Republic has a great relevance. Technical modernization and reconstruction of pumping stations require a reliable scientifically based methodological approach. Each pumping station regularly keeps records and controls the operation of equipment and facilities. These data in processed form can be applied in the modernization of irrigation pumping stations. On the example of the analysis of the reliability characteristics of the Kiziltepa 2 pumping station (Uzbekistan), a methodology has been developed to justify the modernization and the order of replacement of the main equipment. Comparison of the results of calculation of quantitative parameters (criteria) of reliability of pumping station equipment with the data of field tests of aggregates showed that they can diverge. Therefore, the operational reliability assessment should be carried out comprehensively, and not only the results of a full-scale survey should be taken into account, but also the quantitative parameters of the reliability of the pumping station calculated according to previous years of operation. The use of this technique will make it possible to dispense with complex tests to assess the residual life of equipment parts by destructive testing methods.
Comparison of FIS and ARIMA models in runoff estimating
Authors: Slieman Alaa Ali , Kozlov Dmitry
Published: August 2023

The ability to surface runoff modelling plays an important role in the water resources management, and the possibility of estimating and predicting of runoff values takes on particular importance in the case of gaps in the recorded time series. Therefore, this study aims to compare between fuzzy inference system (FIS) models and autoregressive integrated moving average (ARIMA) models in estimating of the surface runoff at Al-Jawadiyah hydrometric station on the Orontes River in Syria. The MATLAB program was used to build the fuzzy inference models and the Minitab program to build the ARIMA models. A large number of fuzzy inference models were built with the change in the model parameters such as the type and number of membership functions and training algorithms. Likewise, a large number of ARIMA models were built with the change in autoregressive components, moving average components, and differences. The effect of seasonality on the model was also studied. Several criteria were used to compare the models and choose the best model, such as correlation coefficient and root mean square errors. The results showed that fuzzy inference models are superior to estimating surface runoff values with high reliability compared with ARIMA models. This study recommends creating complete databases for all factors related to water resources in the study area that can be relied upon in future studies.
Calculation of bank deformation in the confluence of two streams
Authors: Bazarov O. , Babazhanova I. , Babazhanov Y. , Eshev S. , Kholmamatov I. , Ruzieva G.
Published: August 2023

In the article, on the basis of the comfort reflection method, the bank washout that occurs in the joining area of open channels and its effect on the flow pattern is studied. It is shown that the flow hydraulic parameters depend on the angle of joining of the channels.