bluuebunny/crossref_metadata_2025 huggingface dataset:
Therapeutic efficacy of biofeedback pelvic floor muscle exercise in women with dysfunctional voiding
Authors: Chiang Ching-Hsiang , Jiang Yuan-Hong , Kuo Hann-Chorng
Published: July 2021

Dysfunctional voiding (DV), a voiding dysfunction due to hyperactivity of the external urethral sphincter or pelvic floor muscles leading involuntary intermittent contractions during voiding, is not uncommon in neurologically normal women with lower urinary tract symptoms (LUTS). We aimed to investigate the therapeutic efficacy of biofeedback pelvic floor muscle training (PFMT) in female patients with DV and to identify the therapeutic efficacy. Thirty-one patients diagnosed with DV. All participates completed the 3-month biofeedback PFMT program, which was conducted by one experienced physiotherapist. At 3 months after treatment, the assessment of treatment outcomes included global response assessment (GRA), and the changes of clinical symptoms, quality of life index, and uroflowmetry parameters. 25 (80.6%) patients had successful outcomes (GRA ≥ 2), and clinical symptoms and quality of life index significantly improved after PFMT. Additionally, uroflowmetry parameters including maximum flow rate, voided volume, voiding efficiency, total bladder capacity, voiding time, and time to maximum flow rate significantly improved after PFMT treatment. Patients with the history of recurrent urinary tract infection in recent 1 year were found to have unsatisfied therapeutic outcomes. In conclusion, biofeedback PFMT is effective in female patients with DV with significant improvements in clinical symptoms, quality of life, and uroflowmetry parameters. The history of urinary tract infection in recent 1 year is a negative predictor of successful outcome.
Angle-insensitive co-polarized metamaterial absorber based on equivalent circuit analysis for dual band WiFi applications
Authors: Hannan Saif , Islam Mohammad Tariqul , Faruque Mohammad Rashed Iqbal , Chowdhury Muhammad E. H. , Musharavati Farayi
Published: July 2021

A novel and systematic procedure to design a co-polarized electromagnetic metamaterial (MM) absorber with desired outputs and resonance frequencies for dual-band WiFi signal absorption is presented. The desired resonance frequencies with expected S parameters' values were first designed as an equivalent circuit with extensive analysis and then implemented into frequency-selective MM absorber by numerical simulation with precise LRC elements, satisfying least unit cell area (0.08λ), substrate thickness (0.01λ) and maximum effective medium ratio (12.49). The absorber was simulated for the maximum angle of incidence for both the normal and oblique incidences at co-polarization. The absorptions at the desired resonance frequencies were found at a satisfactory level by both simulation and practical measurement along with a single negative value to ensure metamaterial characteristics. The proposed equivalent circuit analysis approach can help researchers design and engineering co-polarization insensitive MM absorbers using conventional split-ring resonators, with perfection in output and desired resonance frequencies without the necessity of lumped elements or multilayer substrates. The proposed metamaterial can be utilized for SAR reduction, crowdsensing, and other WiFi-related practical applications.
Structural plasticity of mumps virus nucleocapsids with cryo-EM structures
Authors: Shan Hong , Su Xin , Li Tianhao , Qin Yuqi , Zhang Na , Yang Liuyan , Ma Linsha , Bai Yun , Qi Lei , Liu Yunhui , Shen Qing-Tao
Published: July 2021

Mumps virus (MuV) is a highly contagious human pathogen and frequently causes worldwide outbreaks despite available vaccines. Similar to other mononegaviruses such as Ebola and rabies, MuV uses a single-stranded negative-sense RNA as its genome, which is enwrapped by viral nucleoproteins into the helical nucleocapsid. The nucleocapsid acts as a scaffold for genome condensation and as a template for RNA replication and transcription. Conformational changes in the MuV nucleocapsid are required to switch between different activities, but the underlying mechanism remains elusive due to the absence of high-resolution structures. Here, we report two MuV nucleoprotein-RNA rings with 13 and 14 protomers, one stacked-ring filament and two nucleocapsids with distinct helical pitches, in dense and hyperdense states, at near-atomic resolutions using cryo-electron microscopy. Structural analysis of these in vitro assemblies indicates that the C-terminal tail of MuV nucleoprotein likely regulates the assembly of helical nucleocapsids, and the C-terminal arm may be relevant for the transition between the dense and hyperdense states of helical nucleocapsids. Our results provide the molecular mechanism for structural plasticity among different MuV nucleocapsids and create a possible link between structural plasticity and genome condensation.
An air-tolerant polymer gel-immobilized iridium photocatalyst with pumping recyclability properties
Authors: Abramov Alex , Maiti Binoy , Reiser Oliver , Díaz Díaz David
Published: July 2021

A novel methacrylate-based cross-linked polymer gel bearing an iridium photocatalyst shows air tolerance and unprecedented pumping recyclability properties.
Room temperature second sound in cumulene
Authors: Melis Claudio , Fugallo Giorgia , Colombo Luciano
Published: July 2021

Second sound is a thermal regime occurring in a wave-like fashion, usually observed at cryogenic temperatures. By atomistic simulations we provide evidence that it might as well occur in a carbon chain even at room temperature.
Theoretical and experimental study on the O(3P) + 2,5-dimethylfuran reaction in the gas phase
Authors: Giustini Andrea , Aschi Massimiliano , Park Heejune , Meloni Giovanni
Published: July 2021

In this work we report a joint experimental and computational study on the 2,5-dimethylfuran oxidation reaction in the gas phase initiated by atomic oxygen O(3P).
A comparative study of [Ag11(iPrS)9(dppb)3]2+ and [Ag15S(sBuS)12(dppb)3]+: templating effect on structure and photoluminescence
Authors: Shen Yang-Lin , Zhao Pei , Jin Jun-Ling , Han Jun , Liu Chen , Liu Zheng , Ehara Masahiro , Xie Yun-Peng , Lu Xing
Published: July 2021

A comparative study of [Ag11(iPrS)9(dppb)3]2+ and [Ag15S(sBuS)12(dppb)3]+ was conducted to elucidate the templating effects of an S2− anion on the geometrical structure and photoluminescence of silver(i) thiolate clusters.
Amorphous Co3O4 quantum dots hybridizing with 3D hexagonal CdS single crystals to construct a 0D/3D p–n heterojunction for a highly efficient photocatalytic H2 evolution
Authors: Hao Xuqiang , Xiang Dingzhou , Jin Zhiliang
Published: July 2021

Herein, a novel amorphous monodisperse Co3O4 quantum dots/3D hexagonal CdS single crystals (0D/3D Co3O4 QDs/CdS) p–n heterojunction was constructed by a simple hydrothermal and electrostatic self-assembly method.
Highly uniform self-assembled monolayers of silver nanospheres for the sensitive and quantitative detection of glutathione by SERS
Authors: Jiang Cailing , Huang Feixiang , Chen Yi , Jiang Li
Published: July 2021

A highly uniform self-assembled silver film for the sensitive detection of glutathione.
Hydrothermal control of the lithium-rich Li2MnO3 phase in lithium manganese oxide nanocomposites and their application as precursors for lithium adsorbents
Authors: Pulido Ruth , Naveas Nelson , Graber Teófilo , Martin-Palma Raúl J. , Agulló-Rueda Fernando , Brito Iván , Morales Carlos , Soriano Leonardo , Pascual Laura , Marini Carlo , Hernández-Montelongo Jacobo , Manso Silván Miguel
Published: July 2021

LMO nanocomposites with a high Li/Mn ratio formed systematically by hydrothermal synthesis at low crystallization temperature can be applied as precursors materials of lithium adsorbents.
Cobalt coordination controlled carbon nanospheres formation and inclusion of amorphous Co3O4 and AuNPs: strongly enhanced oxygen evolution reaction with excellent mass activity
Authors: Muthukumar Pandi , Narasimhan Shreya , Selvam Arunprasanth Panneer , Mariappan Mariappan , Assiri Mohammed A. , Anthony Savarimuthu Philip
Published: July 2021

Co2+ ion coordination with AuNPs surface functional ligands facilitated the formation of carbon nanospheres that encapsulated amorphous Co3O4 and AuNPs and exhibited excellent OER and high mass activity with a low overpotential.
[(VIVO)2MII5] (M = Ni, Co) Anderson wheels
Authors: Fraser Hector W. L. , Payne Emily H. , Sarkar Arup , Wilson Lucinda R. B. , Mitcov Dmitri , Nichol Gary S. , Rajaraman Gopalan , Piligkos Stergios , Brechin Euan K.
Published: July 2021

Heterometallic [(VIVO)2M5] Anderson wheels (M = Ni, 1; Co, 2), synthesised solvothermally, exhibit competing magnetic exchange interactions.
Dual functions of pH-sensitive cation Zr-MOF for 5-Fu: large drug-loading capacity and high-sensitivity fluorescence detection
Authors: Sun Xi-Yu , Zhang Hong-Jing , Zhao Xiao-Yang , Sun Qian , Wang Yuan-Yuan , Gao En-Qing
Published: July 2021

N-methylation cationic metal-organic framework UiO-67-CDC-(CH3)2, simulates as drug delivery system and visual colorimetric fluorescence sensor.
Structural and spectroscopic characterization of a new series of Ba2RE2Ge4O13(RE = Pr, Nd, Gd, and Dy) and Ba2Gd2−xEuxGe4O13tetragermanates
Authors: Lipina Olga A. , Surat Ludmila L. , Chufarov Alexander Yu. , Tyutyunnik Alexander P. , Enyashin Andrey N. , Baklanova Yana V. , Chvanova Anastasia V. , Mironov Leonid Yu. , Belova Ksenia G. , Zubkov Vladimir G.
Published: July 2021

A new series of Ba2RE2Ge4O13and Ba2Gd2−xEuxGe4O13tetragermanates crystallizing in the monoclinic system (S.G.C2/c) have been characterized by various methods. The studied Ba2Gd2−xEuxGe4O13phosphors are appropriate for applications in UV-excited pc-LEDs.
Complex coacervates as extraction media
Authors: van Lente Jéré , Pazos Urrea Monica , Brouwer Thomas , Schuur Boelo , Lindhoud Saskia
Published: July 2021

Macroscopic complex coacervates can be used to extract compounds from aqueous supernatants. Compound partitioning depends on the ionic strength, complex composition, and temperature. These findings show their potential as aqueous extraction media.
Regenerated cellulose strongly adhered by a supramolecular adhesive onto the PVDF membrane for a highly efficient oil/water separation
Authors: Gao Junkai , Wang Jiaqi , Xu Qinyao , Wu Shibin , Chen Yan
Published: July 2021

Cellulose was firstly regenerated onto the PVDF membrane to prepare a superhydrophilic and underwater superoleophobic membrane with outstanding micro-nano-scale porosity and favorable durability for a highly efficient oil/water separation.
Quantitative determination of Al–Cu–Mg–Fe–Ni aluminum alloy using laser-induced breakdown spectroscopy combined with LASSO–LSSVM regression
Authors: Dai Yujia , Song Chao , Gao Xun , Chen Anmin , Hao Zuoqiang , Lin Jingquan
Published: July 2021

In this work, LIBS technology combined with the LASSO–LSSVM regression model was used to improve the detection ability of minor elements in Al–Cu–Mg–Fe–Ni aluminum alloy.
Control of the interface graphitized/amorphous carbon of biomass-derived carbon microspheres for symmetric supercapacitors
Authors: Wang Hongqiang , Li Xin , Peng Jiming , Cai Yezheng , Jiang Juantao , Li Qingyu
Published: July 2021

Rational interface control of porous carbon electrode materials is of significance for achieving efficient supercapacitors.
Photothermal release of an encapsulated therapeutic agent from polymer-wrapped gold nanoparticles
Authors: Baker Daina V. , Arafeh Khaled M. , Asadirad Amir , Kaur Brahmjot , Raza Rameez , Branda Neil R.
Published: July 2021

The photothermal effect of gold nanoparticles wrapped in an amphiphilic polymer shell triggers the un-caging of a known therapeutic agent resulting in the release of the agent into the bulk medium while trapping the by-product of the reaction.
Distinct thermoresponsive behaviour of oligo- and poly-ethylene glycol protected gold nanoparticles in concentrated salt solutions
Authors: Chávez Miriam , Fernández-Merino Ángela , Sánchez-Obrero Guadalupe , Madueño Rafael , Sevilla José Manuel , Blázquez Manuel , Pineda Teresa
Published: July 2021

In this work, the methoxy terminated oligo- and polyethylene glycol of different chain lengths (EGn, n = 7, 18, 45 and 136) is grafted on AuNP surfaces under conditions where they attain maximum grafting densities.
Identification of novel Src, Bcl-2 dual inhibitors by the pharmacophore model, molecular docking, and molecular dynamics simulations
Authors: Zhang Li-chuan , Zhang Hao-ran , Gao Cheng-long , Yu Ri-lei , Kang Cong-min
Published: July 2021

Src is a tyrosine kinase that plays a key role in cell proliferation, migration, invasion, and angiogenesis.
N,C-Coupled naphthylisoquinoline alkaloids: a versatile new class of axially chiral natural products
Authors: Tajuddeen Nasir , Bringmann Gerhard
Published: July 2021

This is the first review on the new subclass ofN,C-coupled NIQs, their isolation and structural elucidation, theirN,C-axial chirality, their biosynthetic origin, their promising antiparasitic and antileukemia activities, and their total synthesis.
Synthesis, characterization, and cellular investigations of porphyrin– and chlorin–indomethacin conjugates for photodynamic therapy of cancer
Authors: Almeida José , Zhang Guanyu , Wang Maodie , Queirós Carla , Cerqueira Ana F. R. , Tomé Augusto C. , Barone Giampaolo , Vicente M. Graça H. , Hey-Hawkins Evamarie , Silva Ana M. G. , Rangel Maria
Published: July 2021

The efficient synthesis of porphyrin– and chlorin–NSAID conjugates, and their singlet oxygen generation capacity and HEp2 cell toxicity are reported.
Hydrosilylation and Mukaiyama aldol-type reaction of quinolines and hydrosilylation of imines catalyzed by a mesoionic carbene-stabilized borenium ion
Authors: Clarke Joshua J. , Devaraj Karthik , Bestvater Brian P. , Kojima Ryoto , Eisenberger Patrick , DeJesus Joseph F. , Crudden Cathleen M.
Published: July 2021

Aldimines and ketimines are hydrosilylated with borenium catalysts at room temperature, giving the corresponding amines in excellent yields. For quinolines, subsequent Mukaiyama aldol reactions can be performed, which are also borenium-ion catalyzed.
Visible-light-accelerated amination of quinoxalin-2-ones and benzo[1,4]oxazin-2-ones with dialkyl azodicarboxylates under metal and photocatalyst-free conditions
Authors: Rostoll-Berenguer Jaume , Capella-Argente Murta , Blay Gonzalo , Pedro José R. , Vila Carlos
Published: July 2021

We describe a direct amination of cyclic amines with dialkyl azodicarboxylates accelerated by visible-light irradiation affording the corresponding products as versatile building blocks for divergent synthesis.
Bis(terpyridine) Ru(iii) complex functionalized porous polycarbazole for visible-light driven chemical reactions
Authors: Anito Dejene Assefa , Wang Tian-Xiong , Liang Hai-Peng , Ding Xuesong , Han Bao-Hang
Published: July 2021

Bis(terpyridine)Ru(iii) complex functionalized porous polycarbazole for photocatalytic amine coupling, aerobic hydroxylation of arylboronic acids, and selective oxidation of sulfides.
Novel synthesis, properties and applications of emerging group VA two-dimensional monoelemental materials (2D-Xenes)
Authors: Khan Karim , Tareen Ayesha Khan , Khan Qudrat Ullah , Iqbal Muhammad , Zhang Han , Guo Zhongyi
Published: July 2021

Two-dimensional materials (2D materials) have been the focal point of recent advanced research owing to their new properties and probability for enlightening fascinating novel phenomena.
On-surface synthesis of π-conjugated ladder-type polymers comprising nonbenzenoid moieties
Authors: Urgel José I. , Bock Julian , Di Giovannantonio Marco , Ruffieux Pascal , Pignedoli Carlo A. , Kivala Milan , Fasel Roman
Published: July 2021

On-surface synthesis provides a powerful approach toward the fabrication of π-conjugated ladder polymers (CLPs). The synthesis of nonbenzenoid CLPs is achieved following two activation steps, including the formation of an intermediate 1D polymer.
Recent advances in the transesterification of β-keto esters
Authors: Hennessy M. C. , O'Sullivan T. P.
Published: July 2021

This review summarises the many advances in the selective transesterification of β-keto esters, with a particular focus on the past 30 years.
Urea-induced supramolecular self-assembly strategy to synthesize wrinkled porous carbon nitride nanosheets for highly-efficient visible-light photocatalytic degradation
Authors: Li Rui , Cui Xianbao , Bi Jingtao , Ji Xiongtao , Li Xin , Wang Na , Huang Yunhai , Huang Xin , Hao Hongxun
Published: July 2021

Wrinkled porous g-C3N4 nanosheets were fabricated by supramolecular MCA self-templates. Due to the reactant and porogen agent urea, g-C3N4 could be modulated with efficient electron–hole pairs and thus superior photocatalytic degradation performance.
Configurable switching behavior in polymer-based resistive memories by adopting unique electrode/electrolyte arrangement
Authors: Krishnan Karthik , Tauquir Shaikh Mohammad , Vijayaraghavan Saranyan , Mohan Ramesh
Published: July 2021

Poly(methyl methacrylate) (PMMA)-based MIM devices have been investigated using four different combinations of electrode/electrolyte arrangement in the device geometry in order to elucidate the resistive switching characteristics.
Covalent immobilization of gold nanoparticles on a plastic substrate and subsequent immobilization of biomolecules
Authors: Matsumoto Mimari , Kaneko Kazuki , Hara Manami , Matsui Masaki , Morita Kenta , Maruyama Tatsuo
Published: July 2021

We propose a novel approach to stably immobilize gold nanoparticles (AuNPs) on a plastic substrate and demonstrate that the modified substrate is also capable of immobilizing biomolecules.
Facile ZnO-based nanomaterial and its fabrication as a supercapacitor electrode: synthesis, characterization and electrochemical studies
Authors: Shaheen Irum , Ahmad Khuram Shahzad , Zequine Camila , Gupta Ram K. , Thomas Andrew G. , Malik Mohammad Azad
Published: July 2021

In recent times, tremendous efforts have been devoted to the efficient and cost-effective advancements of electrochemically active metal oxide nanomaterials.
An efficiency of 14.29% and 13.08% for 1 cm2 and 4 cm2 flexible organic solar cells enabled by sol–gel ZnO and ZnO nanoparticle bilayer electron transporting layers
Authors: Pan Wei , Han Yunfei , Wang Zhenguo , Gong Chao , Guo Jingbo , Lin Jian , Luo Qun , Yang Shangfeng , Ma Chang-Qi
Published: July 2021

Flexible organic solar cells (OSCs) will be a promising energy harvest approach for portable and wearable electronics.
Magnetic helicity and energy budget around large confined and eruptive solar flares
Authors: Gupta M. , Thalmann J. K. , Veronig A. M.
Published: July 2021

Context. In order to better understand the underlying processes and prerequisites for solar activity, it is essential to study the time evolution of the coronal magnetic field of solar active regions (ARs) associated with flare activity.

Aims. We investigate the coronal magnetic energy and helicity budgets of ten solar ARs around the times of large flares. In particular, we are interested in a possible relation of the derived quantities to the particular type of the flares that the AR produces, namely, whether they are associated with a CME or whether they are confined (i.e., not accompanied by a CME).

Methods. Using an optimization approach, we employed time series of 3D nonlinear force-free magnetic field models of ten ARs, covering a time span of several hours around the time of occurrence of large solar flares (GOES class M1.0 and larger). We subsequently computed the 3D magnetic vector potentials associated to the model 3D coronal magnetic field using a finite-volume method. This allows us to correspondingly compute the coronal magnetic energy and helicity budgets, as well as related (intensive) quantities such as the relative contribution of free magnetic energy, EF/E (energy ratio), the fraction of non-potential (current-carrying) helicity, |HJ|/|HV| (helicity ratio), and the normalized current-carrying helicity, |HJ|/ϕ′2.

Results. The total energy and helicity budgets of flare-productive ARs (extensive parameters) cover a broad range of magnitudes, with no obvious relation to the eruptive potential of the individual ARs, that is, whether or not a CME is produced in association with the flare. The intensive eruptivity proxies, EF/E and |HJ|/|HV|, and |HJ|/ϕ′2, however, seem to be distinctly different for ARs that produce CME-associated large flares compared to those which produce confined flares. For the majority of ARs in our sample, we are able to identify characteristic pre-flare magnitudes of the intensive quantities that are clearly associated with subsequent CME-productivity.

Conclusions. If the corona of an AR exhibits characteristic values of ⟨|HJ|/|HV|⟩ > 0.1, ⟨EF/E⟩ > 0.2, and ⟨|HJ|/ϕ′2⟩ > 0.005, then the AR is likely to produce large CME-associated flares. Conversely, confined large flares tend to originate from ARs that exhibit coronal values of ⟨|HJ|/|HV|⟩ ≲ 0.1, ⟨EF/E⟩ ≲ 0.1, and ⟨|HJ|/ϕ′2⟩ ≲ 0.002.
Uncovering the ultimate planet impostor
Authors: Lillo-Box J. , Ribas Á. , Montesinos B. , Santos N. C. , Campante T. , Cunha M. , Barrado D. , Villaver E. , Sousa S. , Bouy H. , Aller A. , Corsaro E. , Li T. , Ong J. M. J. , Rebollido I. , Audenaert J. , Pereira F.
Published: July 2021

Context. Exoplanet searches through space-based photometric time series have shown to be very efficient in recent years. However, follow-up efforts on the detected planet candidates have been demonstrated to be critical to uncover the true nature of the transiting objects.

Aims. In this paper we show a detailed analysis of one of those false positives hidden as planetary signals. In this case, the candidate KOI-3886.01 showed clear evidence of a planetary nature from various techniques. Indeed, the properties of the fake planet set it among the most interesting and promising for the study of planetary evolution as the star leaves the main sequence.

Methods. To unveil the true nature of this system, we present a complete set of observational techniques including high-spatial resolution imaging, high-precision photometric time series (showing eclipses, phase curve variations, and asteroseismology signals), high-resolution spectroscopy, and derived radial velocities to unveil the true nature of this planet candidate.

Results. We find that KOI-3886.01 is an interesting false positive case: a hierarchical triple system composed by a ~K2 III giant star (KOI-3886 A) accompanied by a close-in eclipsing binary formed by a subgiant ~G4 IV star (KOI-3886 B) and a brown dwarf (KOI-3886 C). In particular, KOI-3886 C is one of the most irradiated brown dwarfs known to date, showing the largest radius in this substellar regime. It is also the first eclipsing brown dwarf known around an evolved star.

Conclusions. In this paper we highlight the relevance of complete sets of follow-up observations to extrasolar planets detected by the transit technique using large-pixel photometers such as Kepler and TESS and, in the future, PLATO. In particular, multi-color high-spatial resolution imaging was the first hint toward ruling out the planet scenario in this system.
Determination of the air separator circulation path parameters
Authors: Sharapov Rinat
Published: July 2021

The article discusses the separation process efficiency issue of the fine powders in an air separator. The aerodynamic scheme of the air separator is proposed and the schemes of the gas-material flow through the elements of the separator gas-material path are considered. The equations of the gas-material flow motion through the separator gas-material path elements are proposed. The calculation of the air separator various operating modes is proposed. The results of an approximate graphical-analytical calculation of the gas-material path of the proposed aerodynamic scheme for the air separator are presented. A high convergence of theoretical positions with the performed experiments is shown.
Mathematical modeling of gas flow distribution process in the gas transportation system of Armenia
Authors: Pirumyan Narine , Stakyan Mihran
Published: July 2021

The issues of enhancement the methods of calculation and design of the gas transportation system (GTS) in the Republic of Armenia and the Republic of Artsakh are considered, taking into account the analysis of loading modes and the peculiarities of the system individual nodes’ operation. To calculate the pressure distribution at the nodal points and gas flows, the matrix method for determining the material balance equations for the linear-independent and nonlinear-independent contours of the gas pipeline circuit is used as a process mathematical model. On the energy conservation law basis, the balance capacities equation of gas supply sources and its consumption, distributed among the gas transmission network elements, is proposed. A mathematical model of the gas distribution process is obtained. Calculation methods that allow increasing the economic efficiency of GTS operation under optimal terms of GTS development are proposed.
Mechanical characteristics research of new asphalt pavement structure based on geogrid
Authors: Ni Guangcong , Zhang Xiaomeng , Xu Xizhong , Uglova E.
Published: July 2021

In order to study the mechanical characteristics of new asphalt pavement structural materials, UTM testing machine and Overlay Test (OT) testing machine, four-point fatigue test, tensile test and bending strength test have been carried out on different types of grid asphalt mixtures. The result shows: the addition of different types of grids can effectively improve the mechanical properties of the asphalt concrete pavement structure; geogrid addition can improve the stress on the road surface, improve the strength of pavement materials, it can effectively alleviate early generation of fatigue cracks on the road surface; it can also effectively avoid the problem of rutting damage on the whole road surface after partial damage to the road surface; can effectively promote pavement stress dispersion, improve pavement structure stability, make the pavement structure more stable, improve its service life.
Theoretical foundations of the diagram method for calculating rod elements made of reinforced concrete
Authors: Radaykin Oleg
Published: July 2021

At the present stage of development, the diagram method for calculating rod elements made of reinforced concrete has a number of disadvantages, which is due to the lack of a single holistic theory. The paper attempts to propose its foundations. For this purpose, the most General structure of the theory has been developed, and a three-level computational model has been proposed, hierarchically built on the principle of the computational scheme discretization: level 1 - “element” - the rod design model, built according to the well-known rules of construction mechanics; level 2 – “cross” – enhanced non-linear (discrete) deformation model, adopted by BC 63.13330 with some significant author’s clarification; level 3 – material – the standard samples’ analysis model of concrete and rerod subject to the axial compressive action or tensile static short-term load or under static short-time load, pure shear (to describe proposed Jenny more deformation curve of concrete). A detailed algorithm for the relationship of models at all three levels is described.
Method for calculating strength, crack resistance and stiffness of reinforced concrete beams reinforced with steel fiber concrete based on a nonlinear deformation model
Authors: Radaykin Oleg , Sharafutdinov Linar
Published: July 2021

A very promising way of strengthening reinforced concrete beams looks to be the use of a “jacket” made of steel fiber reinforced concrete for these purposes. There are two good reasons for this: first, in terms of the manufacturing laboriousness, the device of such a “jacket” is comparable to the application of ordinary plaster, and, second, the observed increase in the reinforced beams’ bearing capacity is quite comparable with the use of a steel clip. The literature analysis has shown that the methods for calculating the considered reinforcement method, which would take into account the features of steel fiber concrete as a material, as well as the features of the joint work of the “jacket” with the reinforced beam, does not yet exist. To obtain such a technique, the most suitable, in our opinion, is a numerical diagrammatic method based on the so-called nonlinear deformation model. With its use, a detailed algorithm for calculating the strength, crack resistance and stiffness of reinforced beams has been developed in this article. Comparison of the calculation results with their own experimental data and other authors, the difference in the moment of destruction was 16.46%, for the moment of cracking 9.2%, which indicates the proposed method’s efficiency.
Comparison of the stress-strain state reinforced concrete structures (columns and trusses) with linear and nonlinear statements of the deformation law
Authors: Polyakova Irina , Imambayeva Raykhan
Published: July 2021

The article discusses the calculations of some structures under various laws of deformation. Four laws are adopted: linear, nonlinear exponential, nonlinear with a falling branch, taking into account the creep of concrete, and nonlinear according to the experimental data. As a result of the calculation, the results are given for various efforts, comparative characteristics are given, and conclusions are drawn about the operation of structures and the work of materials. The following has been conducted: 1. Calculation of structures according to the 1st law of nonlinear deformation of materials - exponential law of deformation [1, 2, 3]. 2. Calculation of structures according to the 2nd law - the law of nonlinear deformation of concrete with a falling branch (according to Eurocode 2) [4, 5]. 3. Calculation of structures according to the 3rd law of nonlinear deformation of materials - the exponential law of deformation of the second type [1, 2, 3].
Principles of preserving the architectural heritage on the example of architectural and planning structure restoration in Rostov-on-Don after the Great Patriotic War
Authors: Moskalenko Irina , Sheina Svetlana , Chubarova Karina
Published: July 2021

This work is devoted to the transformation of the architectural and planning structure of the Rostov-on-Don city in the first half of the twentieth century. Its main shortcomings, identified in the 1920s – 1930s, and the ways of solving them are analyzed. The attempts to create a new socialist city are considered. It covers the destruction caused by the German fascist invaders during the two occupations of Rostov-on-Don, which accounted for more than one third of its buildings. The main stages and principles of city planning structure restoration are presented. The projects of restoration and reconstruction, their implementation and detailed planning of Rostov-on-Don are considered.
Architectural form as a subject of cultural communication
Authors: Dymchenko M. , Brykova N. , Lokonova I.
Published: July 2021

The aim of the article is to investigate the architectural form self-representation processes in the spatial experience of culture. Theoretical and methodological prism of the research is the semiotic concept of architecture of W. Eco and the concept of E. Panofsky correlating with it and explaining the nature of the Gothic architectural form evolution. The architectural reality self-definition problem in the context of the historical development of cultural and anthropological experience spatial codes is considered. On the basis of W. Eco’s semiotic concept of architecture we propose the vision of architectural object as a form in which the signifier - the “grammar” of architectural text - is treated as a signifier in the unity of meanings, functions and structures of the work. Architectural form in this capacity is described as a subject of socio-cultural communication, an individual link in the spatial code mediation chain of this or that tradition. On the basis of the comparative analysis, we have demonstrated the similarity of semiotic approach to the essence of architecture and Gothic architectural thinking of E. Panofsky. It shows the relevance of this methodology for modern architecture theory allowing to reveal the processes of architectural reality affirmation. The significance of the results for the theory of architecture consists in the fact that the heuristic significance of Eco’s semiotic conception of architecture was substantiated by E. Panofsky’s conclusions concerning the essence of Gothic form-building. The notion of architectural form as a subject of cultural communication greatly extends the architectural reality affirmative nature notion.
Eclecticism of rationalism in the pre-revolutionary architecture of civil public buildings in the city of Novocherkassk
Authors: Lyudmirskaya Alexandra
Published: July 2021

The article analyzes the little-studied eclectic tradition in the architecture of civil public buildings in Novocherkassk, the peculiarities of its manifestation in the diverse stylistic palette of the city, including neo-Gothic and Art Nouveau, touches on the specifics of the stylistic trends’ manifestation in the rationalist architecture of the “masonry style”, as well as the historical timing of changes in style in a temporary context.
Features of the Kabardians’ vernacular architecture in the 19th - early 20th centuries
Authors: Kanokova Fatima
Published: July 2021

The study examines the vernacular architecture features of the Kabardians in the 19th - early 20th centuries. The main types of dwellings, that are characteristic of the ethnos in the indicated period, are distinguished - these are single-chamber and multi-chamber tourluch houses - huts. The techniques and materials used in their construction are described. The features of the internal space space-planning solutions for each type of dwelling, the presence of a hearth, its sacred function, gender signs of zoning, as well as the principles of organizing the estate space as a whole are revealed.
Features of parking in megacities
Authors: Stepanov Mikhail , Skrininkova V.S.
Published: July 2021

The article deals with the issues of transport parking in megacities. Car parking has a huge impact on people and environment. The lack of parking spaces constrains economy and forces people to park incorrectly, which leads to traffic jams, undermines security and aesthetic appearance of urban spaces. The article discusses various parking options in megacities. The advantages and disadvantages of various parking options are shown. The main factors influencing the construction of parking lots in cities are considered, such as: construction and operating costs; type, location and use of the parking lot; availability and public transport possibilities; local vehicle ownership; a general need to reduce the use of high-emission vehicles. Foreign and domestic parking experience has been analyzed. The issues of the relation between the cost of parking, housing and the average net salary of residents are considered. Recommendations for the convenient design of parking lots are given. Dependences of the required number of parking lots for permanent and temporary parking of cars have been obtained.
Methodology for compiling the ethnographic miniature parks’ exhibits nomenclature of the Armenian nation
Authors: Safaryan Asհօt , Safaryan Yuri , Sargsya Ruben
Published: July 2021

The method of compiling the ethnographic miniature parks’ exhibits nomenclature of the Armenian people is proposed. Brief information about the historical Armenian capitals, which are included in the main exhibition basis, is presented. For each of the historical capitals, on the basis of the conducted research, the layout 3D visualizations, which will be presented in the form of architectural model-exhibits in the parks, have been developed by the authors. The virtual reconstruction of certain significant objects of historical and architectural heritage located both on the territory of Armenia and abroad, which are proposed to be included in the exposition, has also been carried out.
Settlements and dwellings of Adyghe people
Authors: Unezheva Zalina , Sultanova Aminat
Published: July 2021

The article discusses the differences and monotony of the traditional types’settlements of the Circassians, the forms of estates and courtyards.All the main elements of the dwelling are considered in detail: its layout, building material and construction technique, the shape of roofs, the structure and types of hearths and their location, interior, home furnishings and utensils etc. The article covers the period IV - XIX centuries.
The problem of form in modern architecture
Authors: Dymchenko М.Е. , Dakoro М.F. , Dadiyan D.G.
Published: July 2021

The problems of architectural shaping and thinking evolution in the context of the modern society development are considered in the article. The most important issue is the preservation of cultural-historical and ethnonational codes of collective social experience architectural expression in modern Russia. Distinctive features of Russian architecture development on the background of changes in the Western world and consciousness in the globalization era are marked. The contradictions and challenges of establishing a new architectural language in the context of different vectors of the reception of historical heritage and renewal of the cultural layer of Russian society are characterized.
Thermal performance ensuring for enclosing structures
Authors: Egorochkina Inna , Serebryanaya Irina , Shlyakhova Elena , Buzanova Alena , Bakaev Zaurbek
Published: July 2021

The problem of thermal energy increased consumption for heating residential buildings is identified. The solution of this issue is to increase the thermal characteristics of enclosing wall structures by insulating them with effective heat-insulating materials. The results of a comparative analysis on the quality parameters of building materials used for building envelopes insulation are presented. The data of facade systems multilayer structures models’ thermal engineering calculation are given. The recommendations for ensuring safety and energy efficiency parameters during construction and installation work on the enclosing structures’ insulation are presented.
Energy efficient thermal insulation materials for external building walls
Authors: Bzhakhov Muzarib , Battaev Shamil , Nastuyeva Malika
Published: July 2021

This article discusses various types of energy efficient thermal insulation materials. The energy efficiency calculation of a multi-storey 36-apartment residential building using various options for the insulation of enclosing structures has been carried out, after which the results have been compared.
Additive manufacturing of concrete wall structures
Authors: Karpova Ekaterina , Skripkiunas Gintautas , Sedova Anastasiia , Tsimbalyuk Yelyzaveta
Published: July 2021

3D concrete printing is a perspective technology for sustainable construction and realization of sophisticated architectural projects. The current research proposes the thermal engineering calculation of wall structure based on the 3D printed concrete element of a total thickness of 150 mm with the internal air layer about 75 mm. The 3D printing mixture was designed with the addition of perlite as filler in the dosage of 8 % by weight of cement. The printing process was performed by the 3D printer of Contour Crafting type through the nozzle with a size of 20 mm. The thermal engineering calculation was implemented for the A++ energy consumption class. The wall structure based on the 3D printed concrete element with perlit has the thermal resistance comparable with one for wall structures based on brick and aerated concrete. The total thickness of the designed wall structure with 3D printed concrete element decreased by 100 mm and 50 mm in comparison with wall structures based on brick and aerated concrete, respectively. In addition to the thermal engineering calculations, the visual assessment of the surface quality of 3D printed concrete wall elements was performed.
Physical foundations of variatropia recipe regulation and control of concrete properties with centrifugal seal
Authors: Mailyan Levon , Stel’makh Sergei , Shcherban Evgenii , Smolyanichenko Alla , Demidova Alina
Published: July 2021

The features and mechanisms of the processes occurring during concrete centrifugation are considered. It was found that a significant difference in the centrifugal and centripetal forces acting on the outer, middle and inner layers of the cross-section leads to significant differences in the structure and characteristics of the element layers. The possibility of regulating the variatropia and controlling the concrete properties during centrifugal seal by regulating the prescription factors is considered. The forms of various aggregates’ interaction with cement stone and the mixture components’ separation features during centrifugation are analyzed. Based on the analysis data, it is proposed to use a combination of various types aggregates and densities in centrifuged concrete. The main types of fibers are identified and the analysis of the effectiveness of their use is carried out. On the basis of the performed analysis, the most promising way of increasing the efficiency of fiber-concrete centrifuged elements was determined, namely, the combination of two or more types of fibers. The most expedient combinations of the aggregates and fibers’ types have been identified, which makes it possible to guarantee the directional movement of the components of the concrete mixture during centrifugation. In terms of the aggregate, this is the use of a large aggregate with a high density and a fine aggregate with a lower density, and in terms of fibers, it is a combination of steel and non-metallic fibers.
Composition of molding material for ceramic tiles
Authors: Adamyan Vladimir , Kalashnikova Svetlana , Burlakova Victoria , Seferyan Luiza , Sergeeva Galina
Published: July 2021

This article discusses the problems of creating new compositions for ceramic tiles. There are two ways to process the composition of the molding material - dry and wet. A description of the wet processing method is given. The molding of the plastic mass is carried out by pressing to obtain a tile with a size of 50 x 150 mm. The molded product goes through the following stages of the technological regime: blowing in a drying stove with an increase in temperature from 25 °C to 700 °C for 3-4 hours. Further, at a speed of 15-20 degrees per minute, the temperature rises to 1050 0C and then the heat treatment continues for 30 minutes. After annealing, the product is cooled and tested.
Heat pump system built into the room with the implementation of air exchange and microclimate
Authors: Fedosov Sergey , Fedoseev Vadim , Elin Nikolay , Voronov Vladimir , Loginova Svetlana
Published: July 2021

The efficiency and performance of an air heat pump system built into a room, together with supply and exhaust ventilation, currently requires a high-quality microclimate and clean air in the room. The transition in mass housing construction to the sealed windows with double-glazed windows, along with the positive factors such as a decrease in heat loss and a decrease in noise in rooms, led to a deterioration in the air regime in a room with traditional natural ventilation systems. In the winter period of space heating, energy is spent, among other things, on heating the incoming cold air, and in quite significant quantities. At the same time, the required level of air exchange is necessary in both poorly and well-insulated buildings. From this it follows that the heat consumption for ventilation without the use of special innovative engineering and technical solutions will not decrease from this, and the more insulated the building is, the higher in relative terms the ventilation costs will be. As a method for assessing the microclimate comfort, the authors propose the calculations and comparison of individual parameters of the thermal and humidity air regime for the room in accordance with the SanPiN standards. The supply and exhaust ventilation system with a heat exchanger (recuperation) has a number of advantages, which include: saving heat energy spent on heating the ventilation air, depending on the type of heat exchanger system; the efficiency level of air-thermal comfort in the room, due to the aerodynamic stability of the heat pump heating system and balanced heat exchange of the supply and exhaust air; the ability to maintain a minimum relative humidity in the supply and exhaust ventilation system in the range from 40 to 60%, in which viruses are the least viable. The recovered warm air is not just thrown out of the building, but enters a specially equipped mixing chamber with intensively uniform mixing, which allows achieving the efficiency factor of the heat pump COP = 3.5 and the ability to operate such an air heat pump system in climatic zones with the temperatures up to -25 °C.
Organizational and technological aspects of a forensic construction and technical expertise
Authors: Zilberova Inna , Mailyan Vadim , Novoselova Irina
Published: July 2021

Construction industry development has both positive aspects of a social and economic nature and negative ones, associated with an increase in the number of accidents, poor construction and installation work quality and the emergence of disputes between the participants in construction production. The resolution of conflict situations arising in the construction industry between business entities is possible with the use of special construction and technical knowledge. One of the most demanded application forms of such knowledge is judicial construction and technical expertise.
Combination of engineering, technical and design solutions on the example of the renewable energy sources placement on the building envelope
Authors: Galkina Natalia , Govorunov Maksim , Muro Genrikh , Khalezin Sergey
Published: July 2021

Renewable energy design is a complex process requiring many different factors to consider. There are many methods for calculating solar heat supply systems, varying in the degree of feasibility of each specific solution relative to its counterparts. Moreover, each design stage is based solely on the determination of the engineering and technical parameters of the selected solar system execution scheme; such important indicators as reliability, load-bearing capacity and operational safety of structural elements on which the elements of solar power plants are located often fade into the background and are even rarely taken into account by agreement with specialists performing related sections (architectural treatment – AT; structural concept – SC). In turn, the latter creates the need to revise the already adopted design options, and sometimes recalculate the developed measures. The solution to this problem is the development of a conceptual design methodology, including the calculation of active solar systems, taking into account not only climatic parameters that affect the performance of solar systems, but also the fundamental influencing factors that form the load on the load-bearing structural elements of the building, as well as entail a change in it. energy model (in particular, thermal protection indicators). At the same time, it is also possible to correlate the architectural and artistic appearance of the building with the accepted layout of the heliofields of active solar systems on the facades and other protruding elements of the building; including inclined facades.
Computer modeling influence lines of the bridge crane rods load truss in Mathcad system
Authors: Kudryavcev Evgenij , Gavrilenko Aleksandr , Djafari Mostafa
Published: July 2021

Article describes modeling processes influencing the lines in rods load truss of the bridge crane in Mathcad system: for the rods of the top belt of a truss; for the rods of the bottom belt of a truss; for diagonal and vertical rods of a truss at various section of the load truss; algorithm and a program complex for automation of modeling and graphical representation influence lines and maximum their values. The proposed modeling procedures of the influence lines in any section of a load truss make it possible to reduce time and cost for these calculations’ performance at least in ten times and to carry out the research on load truss parameters, rods parameters and materials change effectively.