bluuebunny/crossref_metadata_2025 huggingface dataset:
Frustrated flexibility in metal-organic frameworks
Authors: Pallach Roman , Keupp Julian , Terlinden Kai , Frentzel-Beyme Louis , Kloß Marvin , Machalica Andrea , Kotschy Julia , Vasa Suresh K. , Chater Philip A. , Sternemann Christian , Wharmby Michael T. , Linser Rasmus , Schmid Rochus , Henke Sebastian
Published: July 2021

Stimuli-responsive flexible metal-organic frameworks (MOFs) remain at the forefront of porous materials research due to their enormous potential for various technological applications. Here, we introduce the concept of frustrated flexibility in MOFs, which arises from an incompatibility of intra-framework dispersion forces with the geometrical constraints of the inorganic building units. Controlled by appropriate linker functionalization with dispersion energy donating alkoxy groups, this approach results in a series of MOFs exhibiting a new type of guest- and temperature-responsive structural flexibility characterized by reversible loss and recovery of crystalline order under full retention of framework connectivity and topology. The stimuli-dependent phase change of the frustrated MOFs involves non-correlated deformations of their inorganic building unit, as probed by a combination of global and local structure techniques together with computer simulations. Frustrated flexibility may be a common phenomenon in MOF structures, which are commonly regarded as rigid, and thus may be of crucial importance for the performance of these materials in various applications.
A curved host and second guest cooperatively inhibit the dynamic motion of corannulene
Authors: Yang Yang , Ronson Tanya K. , Lu Zifei , Zheng Jieyu , Vanthuyne Nicolas , Martinez Alexandre , Nitschke Jonathan R.
Published: July 2021

Biomolecular systems show how host–guest binding can induce changes in molecular behavior, which in turn impact the functions of the system. Here we report an artificial host–guest system where dynamic adaptation during guest binding alters both host conformation and guest dynamics. The self-assembled cage host employed here possesses concave walls and a chirotopic cavity. Complementarity between the curved surfaces of fullerenes and the inner surface of the host cavity leads the host to reconfigure stereochemically in order to bind these guests optimally. The curved molecule corannulene undergoes rapid bowl-to-bowl inversion at room temperature. Its inversion barrier is increased upon binding, however, and increased further upon formation of a ternary complex, where corannulene and a cycloalkane are both bound together. The chiral nature of the host also leads to clear differences in the NMR spectra of ternary complexes involving corannulene and one or the other enantiomer of a chiral guest, which enables the determination of enantiomeric excess by NMR.
The RNase MCPIP3 promotes skin inflammation by orchestrating myeloid cytokine response
Authors: Liu Bo , Huang Jiancheng , Ashraf Amina , Rahaman Oindrila , Lou Jing , Wang Ling , Cai Peiliang , Wen Jinping , Anwaar Shoaib , Liu Xiaoli , Ni Hai , Ganguly Dipyaman , Zhao Jijun , Yang Cliff Y.
Published: July 2021

CCCH zinc finger proteins resolve immune responses by degrading the mRNAs of inflammatory cytokines such as tumor necrosis factor (TNF) and interleukin (IL)-6. Here we report that one such family member, monocyte chemotactic protein-induced protein 3 (MCPIP3, also named ZC3H12C or Regnase-3), promotes skin inflammation by simultaneously enhancing TNF in macrophages and repressing IL-6 in plasmacytoid dendritic cells (pDCs). MCPIP3 is positively associated with psoriasis pathogenesis, and highly expressed by macrophages and pDCs. MCPIP3-deficient macrophages produce less TNF and IL-12p40. However, MCPIP3-deficient pDCs secrete significantly more IL-6. This enhanced intradermal IL-6 may alleviate imiquimod-induced skin inflammation. As a result, MCPIP3-deficient mice are protected from imiquimod-induced psoriasiform lesions. Furthermore, early exposure to pDC-derived IL-6 suppresses macrophage-derived TNF and IL-12p40. Mechanistically, MCPIP3 could directly degrade mRNAs of IL-6, Regnase-1, and IκBζ. In turn, Regnase-1 could degrade MCPIP3 mRNAs. Our study identifies a critical post-transcriptional mechanism that synchronizes myeloid cytokine secretion to initiate autoimmune skin inflammation.
Redirected nuclear glutamate dehydrogenase supplies Tet3 with α-ketoglutarate in neurons
Authors: Traube Franziska R. , Özdemir Dilara , Sahin Hanife , Scheel Constanze , Glück Andrea F. , Geserich Anna S. , Oganesian Sabine , Kostidis Sarantos , Iwan Katharina , Rahimoff René , Giorgio Grazia , Müller Markus , Spada Fabio , Biel Martin , Cox Jürgen , Giera Martin , Michalakis Stylianos , Carell Thomas
Published: July 2021

Tet3 is the main α-ketoglutarate (αKG)-dependent dioxygenase in neurons that converts 5-methyl-dC into 5-hydroxymethyl-dC and further on to 5-formyl- and 5-carboxy-dC. Neurons possess high levels of 5-hydroxymethyl-dC that further increase during neural activity to establish transcriptional plasticity required for learning and memory functions. How αKG, which is mainly generated in mitochondria as an intermediate of the tricarboxylic acid cycle, is made available in the nucleus has remained an unresolved question in the connection between metabolism and epigenetics. We show that in neurons the mitochondrial enzyme glutamate dehydrogenase, which converts glutamate into αKG in an NAD+-dependent manner, is redirected to the nucleus by the αKG-consumer protein Tet3, suggesting on-site production of αKG. Further, glutamate dehydrogenase has a stimulatory effect on Tet3 demethylation activity in neurons, and neuronal activation increases the levels of αKG. Overall, the glutamate dehydrogenase-Tet3 interaction might have a role in epigenetic changes during neural plasticity.
Molecular insertion regulates the donor-acceptor interactions in cocrystals for the design of piezochromic luminescent materials
Authors: Zhai Chunguang , Yin Xiu , Niu Shifeng , Yao Mingguang , Hu Shuhe , Dong Jiajun , Shang Yuchen , Wang Zhigang , Li Quanjun , Sundqvist Bertil , Liu Bingbing
Published: July 2021

Developing a universal strategy to design piezochromic luminescent materials with desirable properties remains challenging. Here, we report that insertion of a non-emissive molecule into a donor (perylene) and acceptor (1,2,4,5-tetracyanobezene) binary cocrystal can realize fine manipulation of intermolecular interactions between perylene and 1,2,4,5-tetracyanobezene (TCNB) for desirable piezochromic luminescent properties. A continuous pressure-induced emission enhancement up to 3 GPa and a blue shift from 655 to 619 nm have been observed in perylene-TCNB cocrystals upon THF insertion, in contrast to the red-shifted and quenched emission observed when compressing perylene-TCNB cocrystals and other cocrystals reported earlier. By combining experiment with theory, it is further revealed that the inserted non-emissive THF forms blue-shifting hydrogen bonds with neighboring TCNB molecules and promote a conformation change of perylene molecules upon compression, causing the blue-shifted and enhanced emission. This strategy remains valid when inserting other molecules as non-emissive component into perylene-TCNB cocrystals for abnormal piezochromic luminescent behaviors.
Skin-like mechanoresponsive self-healing ionic elastomer from supramolecular zwitterionic network
Authors: Zhang Wei , Wu Baohu , Sun Shengtong , Wu Peiyi
Published: July 2021

Stretchable ionic skins are intriguing in mimicking the versatile sensations of natural skins. However, for their applications in advanced electronics, good elastic recovery, self-healing, and more importantly, skin-like nonlinear mechanoresponse (strain-stiffening) are essential but can be rarely met in one material. Here we demonstrate a robust proton-conductive ionic skin design via introducing an entropy-driven supramolecular zwitterionic reorganizable network to the hydrogen-bonded polycarboxylic acid network. The design allows two dynamic networks with distinct interacting strength to sequentially debond with stretch, and the conflict among elasticity, self-healing, and strain-stiffening can be thus defeated. The representative polyacrylic acid/betaine elastomer exhibits high stretchability (1600% elongation), immense strain-stiffening (24-fold modulus enhancement), ~100% self-healing, excellent elasticity (97.9 ± 1.1% recovery ratio, <14% hysteresis), high transparency (99.7 ± 0.1%), moisture-preserving, anti-freezing (elastic at −40 °C), water reprocessibility, as well as easy-to-peel adhesion. The combined advantages make the present ionic elastomer very promising in wearable iontronic sensors for human-machine interfacing.
An ultrasensitive molybdenum-based double-heterojunction phototransistor
Authors: Feng Shun , Liu Chi , Zhu Qianbing , Su Xin , Qian Wangwang , Sun Yun , Wang Chengxu , Li Bo , Chen Maolin , Chen Long , Chen Wei , Zhang Lili , Zhen Chao , Wang Feijiu , Ren Wencai , Yin Lichang , Wang Xiaomu , Cheng Hui-Ming , Sun Dong-Ming
Published: July 2021

Two-dimensional (2D) materials are promising for next-generation photo detection because of their exceptional properties such as a strong interaction with light, electronic and optical properties that depend on the number of layers, and the ability to form hybrid structures. However, the intrinsic detection ability of 2D material-based photodetectors is low due to their atomic thickness. Photogating is widely used to improve the responsivity of devices, which usually generates large noise current, resulting in limited detectivity. Here, we report a molybdenum-based phototransistor with MoS2 channel and α-MoO3-x contact electrodes. The device works in a photo-induced barrier-lowering (PIBL) mechanism and its double heterojunctions between the channel and the electrodes can provide positive feedback to each other. As a result, a detectivity of 9.8 × 1016 cm Hz1/2 W−1 has been achieved. The proposed double heterojunction PIBL mechanism adds to the techniques available for the fabrication of 2D material-based phototransistors with an ultrahigh photosensitivity.
A deep learning algorithm for automated measurement of vertebral body compression from X-ray images
Authors: Seo Jae Won , Lim Sang Heon , Jeong Jin Gyo , Kim Young Jae , Kim Kwang Gi , Jeon Ji Young
Published: July 2021

The vertebral compression is a significant factor for determining the prognosis of osteoporotic vertebral compression fractures and is generally measured manually by specialists. The consequent misdiagnosis or delayed diagnosis can be fatal for patients. In this study, we trained and evaluated the performance of a vertebral body segmentation model and a vertebral compression measurement model based on convolutional neural networks. For vertebral body segmentation, we used a recurrent residual U-Net model, with an average sensitivity of 0.934 (± 0.086), an average specificity of 0.997 (± 0.002), an average accuracy of 0.987 (± 0.005), and an average dice similarity coefficient of 0.923 (± 0.073). We then generated 1134 data points on the images of three vertebral bodies by labeling each segment of the segmented vertebral body. These were used in the vertebral compression measurement model based on linear regression and multi-scale residual dilated blocks. The model yielded an average mean absolute error of 2.637 (± 1.872) (%), an average mean square error of 13.985 (± 24.107) (%), and an average root mean square error of 3.739 (± 2.187) (%) in fractured vertebral body data. The proposed algorithm has significant potential for aiding the diagnosis of vertebral compression fractures.
Prokineticin 1–prokineticin receptor 1 signaling in trophoblast promotes embryo implantation and placenta development
Authors: Goryszewska-Szczurek Ewelina , Baryla Monika , Kaczynski Piotr , Waclawik Agnieszka
Published: July 2021

Successful pregnancy establishment in mammals depends on proper embryo-maternal communication. Prokineticin 1 (PROK1) is a secretory protein that exerts pleiotropic functions in various tissues. Despite the studies that have primarily been performed with human cell lines and mice, the function of PROK1 in trophoblasts has still not been fully elucidated. Hence, the aim of this study was to establish the role of PROK1 in trophoblasts during implantation and placentation. Prokineticin 1 mRNA was elevated in porcine trophoblasts during implantation and the early placentation period. Furthermore, we reveal that PROK1–PROKR1 signaling induces the expression of genes involved in the regulation of angiogenesis, immunological response, trophoblast cell adhesion, invasion, and proliferation, as well as stimulating phosphorylation of MAPK and PTK2. Ingenuity Pathway Analysis identified the aforementioned and also other functions associated with PROK1-regulated genes/proteins, such as cell-to-cell contact, epithelial tissue differentiation, Ca2+ release, lipid synthesis, and chemotaxis. We also showed evidence that PROK1 acting via PROKR1 increased trophoblast cell proliferation and adhesion. The PROK1-stimulated cell proliferation was mediated by PI3K/AKT/mTOR, MAPK, and cAMP, whereas adhesion was mediated by MAPK and/or PI3K/AKT signaling pathways. Concluding, our study suggests that PROK1 plays a pleiotropic role in trophoblast function during implantation and early placentation.
Association between overactive bladder and pelvic organ mobility as evaluated by dynamic magnetic resonance imaging
Authors: Kinno Kurenai , Sekido Noritoshi , Takeuchi Yasuharu , Sawada Yoshitomo , Watanabe Shoutarou , Yoshimura Yasukuni
Published: July 2021

Overactive bladder (OAB) is a prevalent condition, which negatively impacts patients’ quality of life. Pelvic organ prolapse (POP), also prevalent in women, has been recognized as an important etiology of female OAB, although the pathophysiological mechanisms remain controversial. In this study, we reviewed findings of dynamic magnetic resonance imaging (dMRI) in 118 patients with POP and investigated the association between dMRI findings, including positions and mobilities of pelvic organs as well as parameters of pelvic organ support and bladder outlet obstruction (urethral kinking), and OAB in order to elucidate the pathophysiology of OAB in patients with POP. Our results showed that compared with non-OAB patients, OAB patients had a significantly higher body mass index, more severe pelvic floor muscle impairment, and more profound supportive defects in the uterine cervix (apical compartment). On the other hand, dMRI parameters showed hardly any significant difference between patients with mild and moderate to severe OAB. These findings may imply that levator ani impairment and defective supports of the apical compartment could be associated with the presence of OAB and that the severity of OAB could be affected by factors other than those related to pelvic organ mobility and support or urethral kinking.
Correlation between lag screw route and the ideal insertion point of the intramedullary nail
Authors: Yoshitani Junya , Kabata Tamon , Kajino Yoshitomo , Inoue Daisuke , Ohmori Takaaki , Ueoka Ken , Yamamuro Yuki , Taninaka Atsushi , Tsuchiya Hiroyuki
Published: July 2021

Understanding the morphology of the superior aspect of the proximal femur is critical for treating femoral fracture. We assessed the correlation among the ideal insertion point of the femoral nail, femur head-neck axis, and native anteversion. One hundred patients with normal femurs were included in this study. Computed tomography (CT) images of the proximal femur superior aspect and amount of native anteversion were acquired. Generalised Procrustes analysis showed the morphological characteristics of the superior proximal femur according to native anteversion amount. Morphological characteristics were represented by 4 parameters; the correlation between parameters and native anteversion was investigated using CT data. The passing point of the line from the proximal femoral canal parallel to the native anteversion at the greater trochanter was located more posteriorly (mean 35.6%); the passing point of native anteversion was posterior in the femoral neck and head, although the line of the head-neck centre passed more anteriorly at the greater trochanter (mean 67.5%). This posterior translation was significantly associated with native anteversion amount. Morphometric geometric analysis showed that the lag screw could not pass head-neck centre from the nail inserted into proximal femoral canal. Anterior insertion of the nail was needed for positioning the lag screw centre.
FROZEN! Intracellular multi-electrolyte analysis measures millimolar lithium in mammalian cells
Authors: Gunawan Renardi , Imran Al , Ahmed Irfan , Liu Yuanchao , Chu Yanwu , Guo Lianbo , Yang Mengsu , Lau Condon
Published: July 2021

We report a novel method named “FROZEN!” to measure intracellular electrolytes in a small sample as little as a single cell. This method is suitable to detect intracellular lithium, sodium, potassium, magnesium and calcium within single cells.
A new and high-performance microfluidic analytical device based on Fusion 5 paper for the detection of chili pepper anthracnose pathogen Colletotrichum truncatum
Authors: Abdelrazig Amir Osman , Tran Bao Thai , Rijiravanich Patsamon , Surareungchai Werasak
Published: July 2021

A microfluidic analytical device based on wax-patterned Fusion 5 paper was designed and fabricated to facilitate early detection and improve control of anthracnose disease.
Flame-made Cu/ZrO2 catalysts with metastable phase and strengthened interactions for CO2 hydrogenation to methanol
Authors: Yang Meng , Yu Jiafeng , Tong Xin , Sun Xingtao , Xu Hengyong , Sun Jian
Published: July 2021

The strengthened Cu–Zr interactions in FSP-Cu/ZrO2 were beneficial for the adsorption of bi-HCOO* and the generation of methoxy species (*OCH3) at the interface by enhancing Cu+ species and Ov compared to the one made by the traditional method.
Density functional theory predictions of the mechanical properties of crystalline materials
Authors: Kiely Evan , Zwane Reabetswe , Fox Robert , Reilly Anthony M. , Guerin Sarah
Published: July 2021

The DFT-predicted mechanical properties of crystalline materials are crucial knowledge for their screening, design, and exploitation.
Virtual coformer screening by a combined machine learning and physics-based approach
Authors: Yuan Jiuchuang , Liu Xuetao , Wang Simin , Chang Chao , Zeng Qiao , Song Zhengtian , Jin Yingdi , Zeng Qun , Sun Guangxu , Ruan Shigang , Greenwell Chandler , Abramov Yuriy A.
Published: July 2021

Cocrystals as a solid form technology for improving physicochemical properties have gained increasing popularity in the pharmaceutical, nutraceutical, and agrochemical industries.
Crystal engineering of nanomaterials: current insights and prospects
Authors: Görke Marion , Garnweitner Georg
Published: July 2021

Nanocrystal engineering has evolved into a dynamic research area over the past few decades but is not properly defined. Here, we present select examples to highlight the diverse aspects of crystal engineering applied on inorganic nanomaterials.
Ambiguities in solvation free energies from cluster-continuum quasichemical theory: lithium cation in protic and aprotic solvents
Authors: Itkis Daniil , Cavallo Luigi , Yashina Lada V. , Minenkov Yury
Published: July 2021

Li cation solvation free energies were calculated in 10 solvents using the cluster-continuum quasichemical theory. The best agreement with experimental-based “bulk” scale values was achieved for the “monomer” cycle predictions.
A review on two-dimensional materials for chemiresistive- and FET-type gas sensors
Authors: Zhang Jian , Liu Lei , Yang Yan , Huang Qingwu , Li Delong , Zeng Dawen
Published: July 2021

The recent development of 2D material-based chemiresistive- and FET-type gas sensors as well as their future directions are comprehensively presented.
An interplay of various damage channels in polyethylene exposed to ultra-short XUV/X-ray pulses
Authors: Medvedev N. , Babaev P. , Chalupský J. , Juha L. , Volkov A. E.
Published: July 2021

Polyethylene under femtosecond low-dose deposition forms defects, whereas at high doses hydrogens detach from carbons, forming hydrogen liquid and complex carbon networks, also changing electronic structures.
Excited-state symmetry breaking in 9,10-dicyanoanthracene-based quadrupolar molecules: the effect of donor–acceptor branch length
Authors: Szakács Zoltán , Glöcklhofer Florian , Plasser Felix , Vauthey Eric
Published: July 2021

Excited-state symmetry breaking in quadrupolar molecules depends on the balance between inter-branch coupling and polar solvation energy.
Synthesis of renewable alkylated naphthalenes with benzaldehyde and angelica lactone
Authors: Wang Ran , Li Guangyi , Xu Jilei , Wang Aiqin , Cong Yu , Wang Xiaodong , Zhang Tao , Li Ning
Published: July 2021

A sustainable route was developed for the synthesis of alkylated naphthalenes with benzaldehyde and angelica lactone that can be derived from lignocellulose.
Oxidation of pollutants via an electro-Fenton-like process in aqueous media using iron–zeolite modified electrodes
Authors: Ferreira Marta , Sahin Nihat E. , Fonseca António M. , Parpot Pier , Neves Isabel C.
Published: July 2021

Eco-friendly modified electrodes based on zeolites are applied for electro-Fenton dye oxidation without the addition of H2O2 at room temperature.
Designing a new basic ionic liquid [DHIM][OH] as a task specific bifunctional catalyst for facile microwave assisted metal free synthesis of 5-amino-1,2,3-triazoles
Authors: Dutta Bidyutjyoti , Garg Anirban , Phukan Parmita , Kulshrestha Akshay , Kumar Arvind , Sarma Diganta
Published: July 2021

A green protocol for the synthesis of a series of 5-amino-1,2,3-triazoles from benzyl cyanide and phenyl azide derivatives catalyzed by the novel bifunctional ionic liquid [DHIM][OH] under microwave irradiation has been developed.
A critical review on the use of DP4+ in the structural elucidation of natural products: the good, the bad and the ugly. A practical guide
Authors: Marcarino Maribel O. , Cicetti Soledad , Zanardi María M. , Sarotti Ariel M.
Published: July 2021

This review provides a critical revision of DP4+, a popular computational method for structural elucidation using DFT NMR calculations. Their strengths and weaknesses are explored, including paths to obtain optimal results.
Three‐dimensional InISAR imaging method for noncooperative targets based on respective LvD transformation and iterative Doppler focussing
Authors: Li Yu , Zhang Yunhua , Dong Xiao
Published: July 2021

Interferometric inverse synthetic aperture radar (InISAR) is an usually adopted approach for three‐dimensional (3D) imaging of noncooperative target with a real or equivalent turntable motion. In practice, the Doppler frequency of non‐cooperative target usually vary nonlinearly, especially when the rotational velocity of the target is fast or the imaging time is relatively long, the azimuth echoes of the target often contain quadratic phase terms. In this case, if we do not compensate the nonlinear phase terms contained in the echoes, the ISAR image will be defocused and then the 3D imaging quality will be degraded. Aiming at solving this problem, a new 3D InISAR imaging method based on respective Lv's distribution transformation and iterative Doppler focussing (RLvDT‐IDF) is proposed in this paper. The major contributions of the proposed approach are as follows: (1) the echo of a range cell which can be treated as the superposition of a series of linear frequency modulation signals (LFMs) is processed by LvDT to specify the chirp rates (CRs) of these LFMs. The CRs are used to construct phase functions so as to remove the quadratic phase term contained in the echo by the IDF method; (2) Considering that the CRs within a range cell received by different channels are relatively different, so different ISAR images are focussed by respective LvDT‐IDF (RLvDT‐IDF), so all the well‐focussed ISAR images can be obtained, which help to improve the accuracy of the image registration and scatterer extraction; (3) Considering that the phase information from the well‐focussed ISAR images may have different errors by the RLvDT‐IDF processing and the unfocused ISAR images contain the complete phase information, so they are used instead of the well‐focussed ISAR images to estimate the interferometric phases of the extracted scatterers; (4) Based on the estimated CRs and 3D coordinates, the target's 3D rotation vector is retrieved by minimising the sum of squared residuals. Both simulations and practical experiment are conducted to validate the proposed method.
About natural oscillations thin elastic wavy non-circular shell
Authors: Eryomin Victor
Published: July 2021

The open profile thin elastic wavy shell natural oscillations problem is considered. The proposed method for determining the numerical values of the lowest frequencies and the corresponding forms of natural vibrations of shells with a complicated shape is based on the Rayleigh-Ritz energy method. The results of numerical calculation for a thin wavy shell with a rigidly pinched lower contour are presented.
Axisymmetric bending of a circular three-layer plate taking into account creep
Authors: Chepurnenko Anton , Vysokovskiy Dmitriy , Rusakova Elizaveta , Vanja Vladimir , Yazyev Serdar
Published: July 2021

The article discusses a method for calculating three-layer plates, in which a lightweight viscoelastic material acts as a middle layer. The technical theory of three-layer structures is used. The derivation of the resolving equation, the numerical and analytical solution of the problem, as well as comparison with the solution in the LIRA software package are presented.
Augmented Lagrangian method for imposing nonlinear multi freedom constraints in static analysis for frames using FEM
Authors: Bich Quyen Vu Thi , Tien Dao Ngoc , Van Tran Thi Thuy , Van Dat Pham
Published: July 2021

This paper focuses on the treatment of nonlinear multi freedom constraints using an augmented Lagrangian method in finite element analysis of frames. The process of imposing boundary constraints is developed by changing the assembly stiffness equation to produce a modified system of equation considering nonlinear multi freedom constraints. For imposing the nonlinear constraints two better methods are the penalty augmentation method and Lagrange multiplier adjunction method. But there are not free of disadvantages. Using penalty method has a disadvantage in the choice appropriate weight values that balance solution accuracy with the violation of constraint conditions. Using the Lagrange multiplier adjunction method requires additional unknowns, and more complicated storage allocation procedures. This research proposes the connection between these methods using the augmented Lagrangian method for imposing the nonlinear multi freedom constraints in finite element analysis of frame. Based on the Newton Raphson method the incremental-iterative algorithm for solving the nonlinear balanced equations is established.
Partial prestressing as a method of equal-strength structures bending approaching
Authors: Khuranov Valery , Kaziev Aslan , Shogenov Akhmed , Balov Azamat
Published: July 2021

The use of partial prestressing as a way to save materials in building structures is observed in the article. The redesign of a typical prestressed reinforced concrete rafter beam with a span of 12 m with parallel belts, in which partial prestressing was applied, made it possible to reduce the main working high-tensile reinforcement consumption by more than 30% and increase the high-tensile reinforcement using efficiency from 0.58 to 0.74.
Reconstruction of a hotel complex building part, taking into account the volumetric planning solution changes
Authors: Voronkova Galina , Rekunov Sergey , Churakov Alexey
Published: July 2021

The paper presents the hotel complex building reconstruction main stages. The self-supporting wall stress-strain state analysis is carried out, taking into account the organization of additional doorways in it. The optimal parameters of their location are given taking into account the arising stress concentrators. The procedure for performing the production of works is given.
Iterative methods for solving nonlinear dynamic problems of construction mechanics
Authors: Panasiuk Leonid , Matua Vakhtang
Published: July 2021

The paper considers direct methods for integrating nonlinear equations of dynamics. Two approaches have been identified for approximating the equations during a small provisional segment. In the first, a more approximate approach is considered, in which the displacements are approximated only with the cross rigidity of the system at the current moment. In the second, an approach in displacement increments is considered, when the change in the system response is differentiated by the achieved level of displacements and their increments at the time step. Different schemes of forth integration for the nonlinear equations in the first and second approaches are considered. The absolute stability of the new proposed schemes of forth integration is proved when using a more accurate approximation in displacements. Theoretical results are supported by the model examples solution for which the exact solution, or the solution in the series is known.
Construction of plastic deformation areas in a homogeneous base of strip foundation
Authors: Bogomolova Oksana , Zhidelev Andrey
Published: July 2021

The article discusses two approaches to the question of plastic deformations constructing areas in a homogeneous baseof a strip foundation: a trivial approach based on the use of the Coulomb plasticity condition, and the approach proposed by the authors based on the approximate analytical solution of the theory of elasticity and the theory of soil plasticity mixed problem. It has been established that the “Coulomb” regions, which originally generated under the edges of the strip load, close under the basement as it increases and form a single crescent-shaped plastic area. Plastic areas built on the basis of a mixed solution develop inward and outward from the foundation. Their closure under the foundation occurs at the beginning of the soil uplift process under the foundation, which is accompanied by the appearance of deep heaving zones (Fig. 8; 9). All other things being equal, the “Coulomb” regions are much larger in size and extend to a greater depth than the regions constructed on the basis of a mixed solution of the theory of elasticity and the theory of soil plasticity problem. The elastic soil core, enveloped by “Coulomb” plastic areas, has a shape close to the shape of a half ellipse or a curved trapezoid, and, alternatively, has the shape of an isosceles triangle with concave lateral sides. If we construct the regions of plastic deformations at the base of a strip foundation using the Coulomb plasticity condition, or apply a solution to a mixed problem, then, all other things being equal, the sizes of the “Coulomb” regions, the “rate” of their development and sensitivity to changes in the value of the lateral pressure coefficient of the soil will always be more than in the alternative case. If the value of the ultimate load is taken as its value corresponding to the closure of the plastic areas under the foundation, then the mixed solution of the theory of elasticity and the theory of plasticity of soils problem gives higher (≥500%) the values of the latter. When finding the value of the bearing capacity of the strip foundation base, it is recommended to apply the solutions of the corresponding problems in the elastoplastic (mixed) formulation, since their results, and this has been shown in the work, are in satisfactory agreement with the experimental data.
Investigation of the dynamic characteristics of the “building - pile foundation” system with the random parameters of foundation soils
Authors: Pshenichkina Valeriya , Zhidenko Artyom , Suhina Kseniya , Drozdov Vyacheslav
Published: July 2021

This article presents the results of a study on the random variability influence of soil deformation parameters - elastic modulus, Poisson’s ratio - on the dynamic characteristics of a building. The spatial finite element system “building - pile foundation” is considered, taking into account the reduction in the acceleration of ground vibrations with depth. The probabilistic calculation of the system is carried out by the Monte Carlo method, the random parameters of the subgrade are taken to be distributed according to the normal law. Statistical characteristics of free frequencies of system vibrations were obtained, it was found that within the same soil type, it is possible to realize system vibrations with a predominance of both the 1st and 2nd forms.
Longitudinal vibrations of rods
Authors: Baragunova Lyalusya , Shogenova Maryana , Kanukoyeva Lyana
Published: July 2021

Elastic structures of buildings and machines, the dynamic behavior mathematical model of which is the problem of longitudinal vibrations of rods, are widespread in modern technology. In this regard, the study of issues related to the longitudinal vibrations of the rods is also an urgent problem currently. In terms of solving such problems, we considered the problem formulation of longitudinal (free and forced) vibration of rods, obtained the spectra of natural frequencies ωn and own forms φn(x) vibration, u(x, t) – the function of cross-sections displacement in the longitudinal direction of the rod has been found.
Investigation of the modular building metal frame nodal connection rotational stiffness
Authors: Shirokov Vyacheslav , Veremeenko Oleg , Alpatov Vadim
Published: July 2021

The research subject is the rotational stiffness of the modular building metal frame nodal connection. The stiffness of nodal connections has a significant impact on the results of calculating the load-bearing frame of a modular building. It is known that absolutely rigid connections exist only in theory. In practice, each nodal connection has a finite stiffness, as evidenced by numerous studies of the researchers. When designing the real objects, the studies on the stiffness of nodal connections of a certain design should be carried out. As a rule, when designing real objects, there is no time to carry out the research. The designer operates with well-known and reliably proven recommendations. It is important for him to have the ready-made solutions for implementation in design practice. Such solutions can be provided on the basis of preliminary studies of the joints’ behavior of the structural elements under load. The article presents a solution to such a problem. The study of the stiffness of the nodal connection with the connected elements parameters variation has been carried out. The purpose of the study is to find the boundaries of design solutions at which the connection can be considered rigid.
Development of modern design solutions to increase the stone buildings’ seismic resistance in the reconstruction process
Authors: Muradyan Viktor , Umarov Artur
Published: July 2021

The article discusses the possible design solutions to improve the seismic resistance of stone buildings. In particular - the device of anti-seismic belts at the floor level, the device of dowels and nodes for connecting the floor slabs with the walls and among themselves, the reinforcement of the walls with steel clips, as well as the installation of transverse frames, if the maximum distances between the transverse walls’ axes are not observed.
“Brick” rationalism architecture in the eclecticism of religious buildings, public buildings and industrial enterprises of the Taganrog city in the late 19th and early 20th centuries
Authors: Lyudmirskaya Alexandra
Published: July 2021

The article analyzes the eclectic tradition in the architecture of religious buildings, public buildings and industrial enterprises of Taganrog, the peculiarities of its manifestation in the diverse stylistic palette of the city, including neo-Gothic and Art Nouveau, touches upon the specifics of the stylistic trends’ manifestation in the “brick style” rationalist architecture.
On the dating of the three-parted temples of Anakopia and Nizhne-Arkhyz fortified settlement
Authors: Pishchulina Victoria , Kishkinova Evgenia
Published: July 2021

The article is devoted to the architectural features comparative analysis of the medieval temples of Simon the Canaanite in New Athos (Abkhazia) and North Zelenchuksky in Karachay-Cherkessia (Russian Federation) in the context of three-porch temples, the study of prototypes of their architectural forms, and a description of the building solutions analysis results of the temples based on the X-ray phase method. This method is applied to the named temples’ research for the first time. The scientific novelty of the article is due to the fact that a comprehensive study of the planning, volumetric-spatial solution and building material of the temples of Simon the Canaanite and Severny Zelenchuksky, based on the results of physical and chemical analysis, allows us to confirm their dating to the 10th century and establish the chronological proximity of the two monuments.
Architectural drawing as a method of graphic modeling that forms the professional mentality of a student-architect
Authors: Kupriyanova Elena
Published: July 2021

The article presents the results of such phenomena as the drawing of an architect and architectural drawing, theoretical approaches and methods of forming project mentality by a student - architect through drawing, analysis of the teaching drawing method to future architects of leading Russian universities, built on projective mentality and analytical drawing from nature and by representation. The examples of some tasks on architectural drawing that form the design mentality of the future architect and the skills of graphic modeling of the architectural space geometry are given.
Methods of mathematical modeling and urban space organization
Authors: Mayatskaya Irina , Yazyev Batyr
Published: July 2021

The use of digital technologies and methods of mathematical modeling allows modern architects to design the cities that have their own unique style and harmoniously fit into the environment. It is necessary to widely introduce three-dimensional modeling methods into practice for more effective urban space creation and development.
Comparative analysis of environmentally friendly materials
Authors: Girya Lidiya , Vinogradova Elena , Gondusova Alina , Muradov Telman , Horoshilov Aleksey
Published: July 2021

Woodworking industry currently generates a large amount of unused waste suitable for recycling. The solution to this urgent problem is the use of this raw material in construction industry, which would solve many economic and environmental problems. The article describes the main technologies for the construction of residential houses from wood concrete blocks and the features of the construction and operation of such buildings. Methods of comparative analysis of the structure of wood concrete and brick housing construction and the possibility of ecological materials’ effective use in the conditions of the Rostov region on the basis of thermal engineering calculation are also presented. Having analyzed the main characteristics and properties of ecological building material, the main advantages and disadvantages of wood concrete in the construction and further operation of residential buildings are considered.
Methods for cleaning soil from benzapyrene in the territory allocated for construction
Authors: Uzhakhov Karkhan , Ulbieva Irina , Uzhakhov Magomed , Tsechoeva Aminat , Dzangieva Ashat
Published: July 2021

The article examines the harm caused by benzapyrene to the environment and human health. Being a carcinogen, accumulating in human body, it has a mutagenic, embryotoxic, hematotoxin effect. Regulations require the removal of contaminated soil from the construction site with subsequent disposal. The disinfection methods are analyzed.
Hybrid finite element formulation for geometrically nonlinear buckling analysis of truss with initial length imperfection
Authors: Quyen Vu Thi Bich , Tien Dao Ngoc
Published: July 2021

This paper presents a novel hybrid FEM-based approach for nonlinear buckling analysis of truss with initial length imperfection. The contribution deals with establishing two types of truss finite element (perfection and imperfection element) considering large displacement based on displacement formulation and mixed formulation. Therefore, the hybrid global equation system is developed by assembling perfection and imperfection truss elements. The incremental-iterative algorithm based on the arc-length method is used to establish calculation programs for solving geometrically nonlinear buckling analysis of truss with initial length imperfection. Using a written calculation program, the numerical test is presented to investigate the equilibrium path for plan truss with initial member length imperfection.
Development of the information modeling (BIM) conceptusing Big Data technologies for the implementation of the life cycle management system for capital construction of transport infrastructure
Authors: Zheleznov Maxim
Published: July 2021

The development of a scientific concept of information modeling in the tasks of managing the capital construction objects’ life cycle is the key to the successful transition of Russian Railways Holding to digital methods of managing and controlling transport infrastructure. The result of the presented complex project implementation will be the scientific basis for the life cycle information modeling concept and information modeling methodology implementation at its stages. Taking into account the rapid increase in the volume of construction information, the development of automatic systems for collecting, processing and storing information, it is proposed to apply Big Data technologies. The project results are planned to be used as a basis for the pilot information modeling technologies’ development at the stages of the railway infrastructure construction objects’ life cycle.
Information technologies for solving urban construction problems
Authors: Serova Elena
Published: July 2021

This study examines the options for using information technologies to solve the urban planning problems in order to improve their solutions’ results quality. The analysis of the information technologies’ use in solving urban planning problems is carried out, the systematization of the need to use certain information technologies, depending on the project development stage, is given. Variants of using certain information systems are considered in detail on the example of designing transport infrastructure facilities. The information technologies development influence levels on improving the quality of solving urban planning problems are determined.
Creation of digital terrain models using software applications
Authors: Germak Oksana , Gugueva Oksana , Kalacheva Natalya
Published: July 2021

The article discusses the construction of a digital terrain model in various programs, which will be used for the vertical planning design. One of the major challenges in this area is the creation of an accurate and realistic surface, which will give an opportunity to create a quality and compliant site. To solve this problem and analyze, a model of the same territory and the same initial data has been built. The paper presents a construction algorithms DTM a method of constructing an irregular grid of heights, graphical implementation and analysis.
Schemes analysis of solar plants with automatic regulation
Authors: Galkina Natalia , Tikhomirov Alexey , Govorunov Maxim
Published: July 2021

This article discusses the main fundamental options for circuit designs of solar heat supply systems (SHS) with integrated automation elements. The subject of these elements’ study in this work is the degree of their influence on the operating parameters of the mentioned systems, in order to find the most versatile and effective way to optimize and increase the solar plants productivity. At the same time, the main focus was the achievement of such a result, in which the successful implementation of the renewable energy and solar heat supply systems development trend, in particular, is possible. In order to achieve the final result of the study, the analysis for the technical and economic feasibility of the considered circuit designs of solar power plants and individual parametric values from the number of these systems’ operating characteristics has been carried out.
Formation of a methodology for managing the strategic stability of transport enterprises
Authors: Grigoreva Svetlana
Published: July 2021

The article deals with the methodological aspects of the formation of a management system for the strategic stability of a transport company. The stages of the methodology formation are considered. A mathematical model for the strategic stability management system analysis has been built. The systematic formalization of strategic stability management is described.
Modeling of accident rates involving trucks in order to improve road safety in the Russian Federation
Authors: Ilina I.E.
Published: July 2021

A statistical analysis of accidents on road transport in the Russian Federation involving trucks was carried out. We have studied the legal acts regulating road safety in General and the implementation of cargo transport in particular. The object of the study is the state of road safety. The possibility of using regression for modeling and analyzing the relationship between the number of cargo vehicles and the length of roads is considered. These indicators are taken into account for 85 regions of the Russian Federation. The result of the joint influence of independent variables on the number of road accidents is obtained. A multiple regression equation is given to explain the model parameters. The constructed model is useful, and the selected two variables “length of highways, km”, “number of cargo vehicles, units” allow predicting the level of accidents on road transport.
Competitiveness of trade enterprises in building and finishing materials’ market in pandemic conditions
Authors: Kovalenkova Olga , Khlopenko Oksana
Published: July 2021

The article examines the impact of new economic conditions against the backdrop of the COVID-19 pandemic on the trade enterprises competitiveness using the example of the market of building and finishing materials. The aim of the study is to identify the qualities that a manager, who is able to bring an enterprise out of a crisis state with the least consequences for it, should possess, to develop a model for managing the competitiveness of trade enterprises by forming a set of corrective measures aimed at ensuring the competitiveness of services accompanying the trade in construction and finishing materials. Theoretical studies were carried out using the methods of system analysis and generalization of the existing scientific developments in the field of managing the trade enterprises’ competitiveness [1]. The methods of statistical analysis were used to determine the crisis impact assessment on the competitiveness of trade enterprises and to identify the competitive advantages of the industrial analyzed segment. As a result of the study, the following results were obtained.: - analysis of trends in the retail industry revealed the main problems of trade enterprises in the context of the crisis caused by the spread of a new coronavirus infection; - the use of the fundamental principles of the formation and maintenance of the organization’s competitive advantages made it possible to determine the competitive advantages of trading enterprises in the market of building and finishing materials, using digital technologies in business, allowing to maintain a stable position in industrial market; - relying on a system of long-term competitive advantages, the main activity areas of trade enterprises were identified, which, thanks to corrective solutions, are able to ensure sustainable development in the context of overcoming the crisis caused by the COVID-19 pandemic.