bluuebunny/crossref_metadata_2025 huggingface dataset:
Sustainability reporting and strategic legitimacy: The influence of operating in emerging economies on the level of GRI reporting in Canada’s largest companies
Authors: Walsh Philip R. , Singh Ranjita , Malinsky Matthew
Published: February 2021

Corporate sustainability reporting is a contributor to strategic legitimacy (Chelli, Durocher, & Fortin, 2018) and certain traditional corporate characteristics (size, industry vulnerability) can influence the level of sustainability reporting (Drempetic, Klein, & Zwergel, 2020). However, limited literature exists in regards to sustainability reporting by Canadian companies operating in emerging countries. Content analysis of sustainability reports examined the current use of the Global Reporting Initiative (GRI) framework. Principal component analysis (PCA) provided a sustainability reporting index (SRI) measure for each firm using factor scores. Correlations and independent-samples t-testing tested the association of the level of reporting to a firm’s size, industry, level of internationalization, and level of activity in emerging economies. A review of 234 large Canadian-based, publicly-traded companies found a total of 86 companies employed the GRI framework, and data from these companies was used in this study. Asset size and vulnerable industries had no significant association with the level of sustainability reporting contrary to prior studies. Operating in emerging economies resulted in greater levels of sustainability reporting when compared to firms that do not. This finding is consistent with the external legitimacy strategy and contributes to the limited literature in this area
Substitution of the SERCA2 Cys674 reactive thiol accelerates atherosclerosis by inducing endo-plasmic reticulum stress and inflammation
Authors: Su Hang , Mei Yu , Wu HaiXia , He Yan , Shiraishi Yasunaga , Hu Pingping , Cohen Richard A. , Tong Xiaoyong
Published: February 2021

BACKGROUND AND PURPOSE The cysteine674 (C674) thiol of
Sarcoplasmic/endoplasmic reticulum Ca2+ ATPase 2 (SERCA2) is easily and
irreversibly oxidized under atherosclerotic conditions. However,
contribution of the C674 thiol redox status in the development of
atherosclerosis remains unclear. Our goal was to elucidate the possible
mechanism involved. EXPERIMENTAL APPROACH Heterozygous SERCA2 C674S
knock-in (SKI) mice in which half of the C674 was substituted by
serine674 were used to mimic removal of the reactive C674 thiol which
occurs under patholog-ical conditions. The whole aorta and aortic root
were isolated for histological analysis. Bone marrow derived macrophages
(BMDMs) and a cardiac endothelial cell line were used for intra-cellular
Ca2+, macrophage adhesion and protein expression analysis. KEY RESULTS
SKI mice developed more severe atherosclerotic plaque and macrophage
accumulation. Cell cul-ture studies suggest the partial substitution of
SERCA2 C674 increased intracellular calcium lev-els and ER stress in
both BMDMs and ECs. The release of pro-inflammatory factors and
macro-phage adhesion increased in SKI BMDMs. In normal ECs, the
overexpression of C674S mutant induced endothelial inflammation and
promoted macrophage recruitment. Additionally, 4-phenyl butyric acid
(4-PBA), an ER stress inhibitor, prevented the increased atherosclerosis
observed in SKI mice, and alleviated ER stress and inflammatory
responses in BMDMs and ECs exposed to 4-PBA. CONCLUSIONS AND
IMPLICATIONS The substitution of SERCA2 C674 thiol accelerates the
development of atherosclerosis by in-ducing ER stress and inflammation.
Our findings highlight the importance of SERCA2 C674 redox status in the
context of atherosclerosis, and open up a novel therapeutic strategy to
combat atherosclerosis.
THROMBUS ASPIRATION WITHOUT STENTING IN A PATIENT WITH ANTERIOR STEMI (REGRESSION AND HEALING OF AN UNSTABLE PLAQUE 24 MONTHS LATER AFTER PCI ASSESSED BY OCT)
Authors: Babunashvili Avtandil , Pancholy Samir , Babunashvili Tamara , Prohorov Alexander
Published: February 2021

We report a case of natural healing of a ruptured unstable coronary
plaque using serial OCT examination. Stenting procedure was deferred
based on the angiographic and mainly OCT findings. A healing process of
ruptured plaque without foreign body was studied using OCT at 3, 14 and
24 months after PCI.
Towards an affordable magnetomyography instrumentation and low model complexity approach for labour imminency prediction using a novel multiresolution analysis
Authors: Nsugbe Ejay , Sanusi Ibrahim
Published: February 2021

The ability to predict the onset of labour is seen to be an important
tool in a clinical setting. Magnetomyography has shown promise in the
area of labour imminency prediction, but its clinical application
remains limited due to high resource consumption associated with its
broad number of channels. In this study, five electrode channels, which
account for 3.3% of the total, are used alongside a novel signal
decomposition algorithm and low complexity classifiers (logistic
regression and linear-SVM) to classify between labour imminency due
within 0–48hrs and >48hrs. The results suggest that the
parsimonious representation comprising of five electrode channels and
novel signal decomposition method alongside the candidate classifiers
could allow for greater affordability and hence clinical viability of
the magnetomyography-based prediction model, which carries a good degree
of model interpretability.
Value of 3-dimensional speckle tracking echocardiography in the prediction of cardiovascular events in patients with hypertension complicated by acute myocardial infarction: a long-term follow-up study
Authors: Chen Xiaoyan , Yang Qingmei , Fang Jianxiu , Guo Haifeng
Published: February 2021

Background Patients with hypertension complicated by acute myocardial
infarction (AMI) have a poor prognosis. Identification of powerful
predictors of recurring cardiovascular events (RCEs) is very important.
This study sought to evaluate the predictive value of three-dimensional
(3D) strain parameters for RCEs in patients with hypertension
complicated by AMI. Methods We successfully followed up 62 patients with
hypertension and AMI. Participants underwent three-dimensional
echocardiography before, one week after, and one month after
percutaneous coronary intervention (PCI). Left ventricular (LV)
structural function parameters and three-dimensional strain parameters
(3-dimensional global longitudinal strain (3D-GLS), 3-dimensional global
circumferential strain (3D-GCS), 3-dimensional global radial strain
(3D-GRS), and 3-dimensional global area strain (3D-GAS)) were acquired.
We used a Cox model to determine the relationships between these
parameters and RCEs. Results During follow-up (41.27±20.45 months), 20
patients (32.8%) had RCEs, which were independently predicted one month
after PCI by 3D-GLS (HR: 1.481, 95%CI: 1.202-1.824) and 3D-GAS (HR:
1.254, 95%CI: 1.093-1.440). The optimal 3D-GLS and 3D-GAS cutoffs for
predicting cardiac events were >-12.5% [area under the
receiver operating characteristic curve (AUC) 0.736, 95%CI 0.611-0.862,
P=0.003)] and >20.5% (AUC 0.685, 95%CI 0.551-0.818,
P=0.020), respectively. Using logistic regression analysis, we
constructed joint predictor=(3D-GLS)+(3D-GAS)×0.303/0.558, and its
cutoff point was -22.36% (AUC 0.829, 95%CI 0.722-0.937,
P<0.001). Conclusions 3D-GLS and 3D-GAS assessed one month
after PCI can predict RCEs in patients with hypertension complicated by
AMI. Additionally, the predicted value of (3D-GLS)+ (3D-GAS)×0.303/0.558
was higher than the predicted value of either parameter alone.
Estudio de caso del aprendizaje basado en proyectos desde los actores de nivel primaria
Authors: González-Fernández María Obdulia , Becerra Vázquez Laura
Published: February 2021

Este trabajo presenta los resultados de una investigación cualitativa con la finalidad de caracterizar los desafíos de la metodología de aprendizaje basado en problemas (ABP) en una institución privada de educación básica en México. El estudio se desarrolló a partir de 15 entrevistas realizadas a directivos, docentes y alumnos. Se utilizó el análisis de contenido para la sistematización de los datos. Los códigos principales fueron percepción del aprendizaje, limitaciones, sugerencias, ventajas y ambiente de aprendizaje. Los resultados demuestran que la metodología de aprendizaje basado en proyectos promueve el pensamiento crítico, la creatividad y la autonomía. Como uno de los desafíos se encuentran los paradigmas tradicionales, el conformismo y el desconocimiento de la estrategia por parte de los docentes. En específico, los resultados de las entrevistas a estudiantes demuestran que no cuentan con las habilidades para el manejo de la información al momento de generar los proyectos; además, necesitan reforzar las habilidades para la coordinación del trabajo en el interior de un equipo. Se destaca la importancia del generar ambientes de colaboración, para lo cual la temática o pregunta del proyecto debe ser motivadora para el estudiante y, por último, promover en todo momento una actitud activa frente el aprendizaje. Estos resultados permiten conocer una parte de la integración en el nivel básico del ABP, por lo que ayuda a impulsar su integración en las diferentes comunidades educativas, no solo de forma enunciativa, sino práctica.

Por último, como limitantes del estudio se identifica el carácter metodológico, por lo que para futuras indagaciones de este tipo se puede aumentar la muestra, lo que permitirá conocer la realidad de aplicar dicha metodología en otras instituciones.
Pengaruh Variasi Konsentrasi HCl Pada Pembentukan Nanosilika Berbasis Batu Apung
Authors:   Lampung University, Sari Lusi Vusfita , Manurung Posman ,   Lampung University, Yulianti Yanti ,   Lampung University
Published: February 2021

The aims of this research is to determine the effect of variation concentration of HCl on chemical composition, phase formed, and particle size on pumice powder. Nanosilica is made using the solgel method with NaOH concentration 4 M, H2SO4 5 M and variation concentration of HCl 0,5; 0,75; 1; 1,25 dan 1,5 M. The XRF results showed the greatest chemical composition value in the silica pumice powder sample with a value of 77.80%. This value is higher after synthesis at the highest chemical composition value in the nanosilica sample 1,25 M HCl concentration of 87.05%. The XRD results show a diffractogram of pumice powder samples formed by anorthite and albite phases while in the nanosilica sample 1,25 M HCl concentrates are debated with the amorphous phase. The TEM results show particle size of nanosilic sample 1,25 M HCl concentration is 5 nm with average particle size (12.02 ± 3.23) nm.
Pengaruh Ethanolamina (MEA) dalam Pembentukan TiO2 dari Bahan Awal Ti Butoksida
Authors:   Lampung University, Rahayu Rika , Manurung Posman ,   Lampung University, Yulianti Yanti ,   Lampung University
Published: February 2021

Titanium dioxide has been prepared through the sol gel method using the addition of ethanolamine. The research was conducted to study the effect of MEA on the formation of TiO2. The amount of MEA was varied to 0; 0.5; 1; 1.5; and 2 ml respectively. The samples were calcined at a temperature of 500 ºC. TiO2was characterized using X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and photocatalyst tests using UV lamps. The XRD characterization results showed that in the A sample an anatase phase was formed whereas in the Csample an anatase phase and a brookite phase were formed. The resultof TEM characterization using ImageJ software show that the particle size of TiO2 is26,1 nm, respectively. The results of the characterization of the fastest photocatalyst catalyst test occurred in sample C which the variation of MEA is 1 ml.
Pengaruh Variasi H2SO4 Pada Pembentukan Nanosilika Berbasis Batu Apung
Authors:   Lampung University, Nuraini Riska Trisna , Manurung Posman ,   Lampung University, Suprihatin Suprihatin ,   Lampung University
Published: February 2021

Nanosilica was extracted by using NaOH, H2SO4 and HCl. The amounth of NaOH and HCl are 3,0 M and 1,0 M respectively. The titration using H2SO4 was varied of 4,0 M; 4,5 M; 5,0 M; 5,5 M; 6,0 M. The pumice powder was calcined for 4 hours at 500 ºC and the nanosilica powder was calcined for 5,5 hours at 800 ºC. The results of X-Ray Flouresence (XRF) showed nanosilica with the highest purity in variation of H2SO4 5,0 M at 95,32%. The results of the X-Ray Diffractometer (XRD) showed that pumice consistent the anorthite and albite phase. The variation of H2SO4 5,0 M produced an amorphous phase. The results of Transmission Electron Microscopy (TEM) show nanosilica particle size with variations of H2SO4 5,0 M in the range 4,8-11,3 nm with an average (7,62 ± 2,15) nm.
Variasi Konsentrasi Inhibitor Ekstrak Buah Harendong (Melastoma Affine D. Don) Pada Baja Per Daun Dengan Perlakuan Panas 300 Dan 700 °C Terhadap Laju Korosi Dalam Larutan NaCl 3%
Authors:   Lampung University, Kurniawan Dwi , Suka Ediman Ginting ,   Lampung University, Suprihatin Suprihatin ,   Lampung University
Published: February 2021

Research on variations in the concentration of inhibitors of harendong extract (Melastoma Affine D. Don) on steel per leaf with heat treatments 300 and 700 °C has been carried out on the corrosion rate in 3% nacl solution.The purpose of this study was to determine the efficiency of harendong fruit extract on the rate of koros in steel per leaf with heat treatment 300 and 700 °C. To determine the corrosion rate, the method of weight loss is used. The results showed that the efficiency of harendong fruit extract on the 5% inhibitor concentration at 300 °C was 90.345%. Based on the results of XRD in the sample Fe obtained with the Orthorombic crystal structure. Based on the results of SEM analysis and EDS the corroded sample surface area was reduced and fewer FeO levels in the sample were reduced. From the results of the corrosion rate and SEM and EDS analysis, it was found that the harendong fruit extract inhibitors were effective in inhibiting the corrosion rate in steel per leaf
Pemanfaatan Biomassa Sebagai Inhibitor Organik Pada Baja Aisi 1020 Di Universitas Lampung
Authors:   Lampung University, Damayanti Rizky , Karo Pulung Karo ,   Lampung University, Riyanto Agus ,   Lampung University
Published: February 2021

Research has been conducted on. The utilization of biomassa as an organic inhibitor in AISI 1020 steel at Lampung University. Samples of carbon steel AISI 1020 were immersed in 3% corrosive medium HCl without being given and given inhibitors of leaf extract jengkol, salam, ketapang and mango 0.8% for 4 and 7 days. inhibitors of leaf extract jengkol, salam, ketapang and mango 0.8% for 4 and 7 days. Calculation of reduction in corrosion rate is carried out by the method of weight loss. The results showed that the addition of Biomasaa inhibitors was effective in reducing the corrosion rate of the samples with the greatest efficiency in the soaking of 7 days of ketapang leaves, which was equal to 74.22%. The results of XRD characterization showed that the phases formed were Fe and Fe2O3 in samples coated with inhibitors and in samples soaked without phase inhibitors Fe2O3 which were corrosion products. The results of SEM characterization showed that the microstructure of the surface of the sample after immersion in the inhibitor contained thin layers overlaying the steel in the sample not coated with the inhibitor, clearly visible cracks and holes indicating that the sample had undergone corrosion.
Pengaruh Penambahan Inhibitor Ekstrak Kopi Dan Waktu Perendaman Terhadap Laju Korosi Pada Baja Karbon Aisi 1020 Dalam Larutan Nacl 3%
Authors:   Lampung University, Simanjuntak Hartono , Suka Ediman Ginting ,   Lampung University, Suprihatin Suprihatin ,   Lampung University
Published: February 2021

Ekstrak kopi yang digunakan sebagai inhibitor pada sampel baja karbon AISI 1020, direndam dalam medium korosif NaCl 3%. Dengan memvariasikan waktu perendaman 4 hari dan 8 hari, dan juga konsentrasi inhibitor 0%, 3%, 5% dan 7%. Setelah perlakuan pada sampel diperoleh hasil perhitungan laju korosi yang paling lambat pada sampel AISI 1020 8.7 dan yang paling cepat pada sampel AISI 1020 4.0. Inhibitor yang digunakan mempunyai nilai efisiensi paling tinggi pada sampel AISI 1020 4.7. Hasil karakterisasi XRD menunjukkan bahwa struktur kristal yang terbentuk merupakan fasa Fe murni. Karakterisasi SEM menunjukkan morfologi permukaan sampel, terlihat gumpalan pada sampel. Karakterisasi EDS pada sampel terlihat unsur Oksigen (O) yang mengindikasikan bahwa sampel telah terkorosi.
Penentuan Indeks Bias Kaca Berdasarkan Pola Interferensi Cahaya Laser Terhambur Menggunakan Cermin Datar “Berdebu”
Authors:   Universitas Widya Dharma, Ellyana Rossy Lydia , Kusuma I Wayan Angga Wijaya ,   Universitas Widya Dharma
Published: February 2021

Experiment on Interference Pattern of Laser Light Scattered Analysis using a "Dusty" Plane Mirror aims to determine the glass refractive index value. The dust samples used in this experiment are baby powder, chalk, rice flour, wood powder and beauty powder. The dust samples sprinkled over a clean mirror, so it will produce an interference pattern that can be seen on the screen. The results of the interference pattern are circular because the screen is perforated with a diameter of 0.01 m. Dust particle sample variation only affects the brightness level of interference patterns. Analysis of interference patterns using red laser pointers or green laser pointers will get the brightest interference patterns when using baby powder compared to other dust samples. Based on the resulting interference pattern, the refractive index value of the glass using a red laser pointer is 1.62 ± 0.04 and the weighted average value of the glass refractive index is 1.68 ± 0.02, whereas the refractive index value of glass using a green laser pointer is 1.74 ± 0.07 and the weighted average value of the refractive index of the glass is 1.79 ± 0.02
Scientific and technical support at the construction and operation of cultural and sports facility
Authors:   Siberian State Automobile and Highway University, Volovnik N. S. , Demidenko O. V. ,   Siberian State Automobile and Highway University, Kazakov V. A. ,   Siberian State Automobile and Highway University, Gashkov P. V. ,   «Omsktekhuglerod» LLC
Published: February 2021

The article is devoted to the actual problem of scientific and technical support of the universal large-span structure being built in Nefteyugansk. The design solution of the structure is considered and analyzed. During erection and operation of the structure, scientific and technical support has been provided. Instruments using non-destructive methods of inspection during construction have been selected and recommended, a system of sequential actions and stages during operation has been formed. The materials of the article allow planning in-kind measurements on the site during its construction and operation and may be the basis of further
Optimization of selection and technology improvement for under floor heating design
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Kazakov Yu. N. , Novikova K. A. ,   Saint Petersburg State University of Architecture and Civil Engineering, Makaridze G. D. ,   Saint Petersburg State University of Architecture and Civil Engineering
Published: February 2021

The paper considers all possible options for providing homes with under floor heating. An analysis and calculation of each system is carried out, with the identification of strengths and weaknesses. Based on the analysis, there is chosen the most cost-effective and environmentally friendly heating method which can be used everywhere. A new technology developed by the authors for using of floors with glycerin is substantiated, which has a high level of manufacturability, simplicity and affordability during installation and operation throughout the life cycle.
Express monitoring of technical condition of tower crane on the basis of integral-differential approach
Authors:   «Scientific-technical center «Etalon» LLC, Sharmanov V. V. , Mamaev A. E. ,   «Scientific-technical center «Etalon» LLC, Simankina T. L. ,   Peter the Great St. Petersburg Polytechnic University, Braila N. V. ,   Peter the Great St. Petersburg Polytechnic University, Romanovich M. A. ,   Peter the Great St. Petersburg Polytechnic University, Osipenkova I. G. ,   Saint Petersburg State University of Architecture and Civil Engineering
Published: February 2021

The article presents a method for calculating the technical condition of the tower crane on the basis of integrated monitoring of the mechanisms of the lifting structure using a digital model.The use of information technologies allows to take a new look at the issues of ensuring the safe operation of lifting mechanisms. Due to the application of these technologies, a qualitatively new method of calculating the technical condition of tower cranes on the basis of an integral-differential approach, which takes into account the score of defects, according to the regulatory documentation, is proposed. The concept of the technical condition index of the tower crane (TCItc), as an integral indicator reflecting the general condition of the nodes and mechanisms of the crane, is introduced. The use of information technologies to calculate the technical condition index of tower cranes makes it possible to integrate the geometric parameters of the tower crane and a mathematical algorithm for their evaluation, which results in a quantitative assessment of defects formed during the operation of tower cranes.
Increasing the uniformity of road surface loading to extend its service life
Authors:   Tyumen Industrial University, Andronov R. V. , Elkin B. P. ,   Tyumen Industrial University
Published: February 2021

The study reveals the problem of heterogeneous loading of road surfacing with vehicle wheels, which leads to the rapid appearance of rutting on the road within 2-3 years and increases the burden on the budgets of the road sectors of cities, regions and the country. The most cost-effective way of extending the service life of road surfacing is presented, namely, periodic shifting of the rolling strips (PSRS), which has passed the stages of research, experiment and the beginning of pilot implementation, but it has not yet found a wide application. The authors review the materials of research on asphalt concrete on rutting testers, asphalt concrete surfacing on the tracks and beyond them, as a scientific substantiation for engineering innovation. The optimal value of the periodic road markup offset is determined from the point of view of probability theory. It is proposed to actively apply the PSRS method on the roads of cities and regions in different climatic zones.
Development problems of the Russian intelligenttransport systems
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Beleshev D. A.
Published: February 2021

The article examines the history of development of intelligent transport systems in Russian at four levels of intellectualization: from the simplest electromechanical systems to complex embedded systems; the systems of Russia, Europe and the USA are compared from the position of regulatory, technical and economic levels of support. Based on the comparison analysis of the above mentioned systems, the problems of the development of intelligent transport systems in Russia (namely, fragmentation and narrow focus of the existing systems) are considered. As a novelty of the research, some solutions are offered to the problems of Russian ITS development.
Method for continuous individual correction of vehicles` maintenance interval
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Chernyaev I. O. , Vorob'ev S. A. ,   Saint Petersburg State University of Architecture and Civil Engineering, Evtyukov S. A. ,   Saint Petersburg State University of Architecture and Civil Engineering
Published: February 2021

The article considers the existing methods of correcting the vehicles` maintenance interval. Based on the analysis of modern features of road transport operation, some disadvantages are shown. The authors provide a developed method of continuous individual correction, which allows calculating the rational maintenance interval individually for the vehicle based on information about the conditions under which its operation is carried out. The use of information about the geographical coordinates of the vehicle obtained using global navigation systems for the implementation of the developed method is considered. Calculation formulas and algorithm are provided. Recommendations for improving the developed method and the direction of further research are offered.
Assessment of the urban environment quality on the example of Orenburg
Authors: Mubarakshina M. M. ,   Orenburg State University, Vorontsova O. N. ,   Orenburg State University, Lekareva N. A. ,   Samara State Technical University
Published: February 2021

The article presents the system of assessment criteria worked out by the authors which allows determining the level of the urban territory development of Orenburg. All the criteria are presented in five categories, each of them containing the relevant indicators: transport accessibility, cultural and social services, demand for housing, development potential, landscape and environmental characteristics of the environment. The assessment is aimed at determining the quality of environmental characteristics of each city district for subsequent identification of the possible level of depressiveness. The authors propose some strategies for rehabilitation, such as transport infrastructure development; improvement of the district environmental; economic growth and reviving investment attractiveness of the district and the city of Orenburg; improvement of the comfort of living for citizens and socio-cultural qualities of the city environment.
The relevanceof the scientific heritage of M. S. Fishelson for solving problems of transport planning
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Shesterov E. A. , Kalyuzhnyi N. A. ,   Institute for Study of Regional Economy Problems RAS, Losin L. A. ,   Institute for Study of Regional Economy Problems RAS
Published: February 2021

The paper considers the scientific heritage of M. S. Fishelson, who studied the regularities of the city settlement system in regard to the practical task of the city transportation system development. There has been carried out an analysis of the settlement theory developed by M. S. Fishelson, as well as a comparison study of the «settlement curve» proposed by the scientist with the graphs obtained during calculations using modern information software complexes for predicting transport demand and traffic flow distribution intensity. The relevance and applicability of this theory in modern conditions has been substantiated.
Solution of sustainability tasks by finite element method
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Maslennikov A. M. , Kobelev E. A. ,   Saint Petersburg State University of Architecture and Civil Engineering, Maslennikov N. A. ,   Saint Petersburg State University of Architecture and Civil Engineering
Published: February 2021

New functions are proposed to describe the deformed state of rods upon loss of stability for two types of rods with different boundary conditions. To solve stability problems with a kinematic uncertainty number of more than two, it is recommended to reduce solution to a characteristic equation with the further use of computer programs with matrix operations. For this purpose, a stiffness matrix and potential loading matrix were developed for the adopted functions. Following the example of classical displacement method for the mentioned rods, there was developed a table of reactions for single displacements. Several examples are given that illustrate fairly close results to the exact solutions.
Experimental evaluation of pile distortion settlement of boring and driven piles
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Efimov V. O.
Published: February 2021

The article proposes a new method for experimental evaluating of the pile distortion settlement value based on the results of static soil tests with a production pile. Evaluation of the pile distortion settlement value has been carried out for the most common dimensions and types of piles which were made using various technologies in different soil conditions (the total number of 157 piles). There has been revealed an empirical equation of the value of pile distortion settlement in dependence on the geometric parameters of piles and manufacturing technology.
Using of a vibrating grab to perform special types of construction works
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Verstov V. V. , Latuta V. V. ,   Saint Petersburg State University of Architecture and Civil Engineering, Zhivotov D. A. , Vorona-Slivinskaya L. G. ,   Saint Petersburg State University of Architecture and Civil Engineering
Published: February 2021

Performing special types of construction work is accompanied by extraction of soil from the cavity of various structural elements immersed in the soil. The use of traditional jaw rope grabs for these purposes does not provide high productivity. The authors of the article consider the task of extracting water-saturated soils without large inclusions using vibrating grabs.
Urban ecology concept of spatial development in Russia: implementation perspectives
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Vaytens A. G. , Shubenkov M. V. ,   Moscow Institute of Architecture (State Academy)
Published: February 2021

The article considers several relevant questions: will the period of population concentration in large cities and metropolises, which are the main resource - energy consumers and sources of environmental degradation, eventually come to end? What should the new cities be like and what should be done with the old ones which were built on the basis of the consumption growth ideology and unregulated spatial expansion? Is there any way for existing cities to evolve into new forms? The urban ecology concept is presented in regard to Russia, and its implementation perspectives under the current crisis conditions are discussed.
Substantiation of the diagnostic parameter for determining latent damage to car tyres
Authors:   Tambov State Technical University, Holshev N. V. , Lavrenchenko A. A. ,   Tambov State Technical University, Konovalov D. N. ,   Tambov State Technical University, Minayev P. S. ,   Tambov State Technical University
Published: February 2021

The article provides substantiation for the possibility of diagnozing latent damage to car tyres by comparing the average value of the static tyre rate at different points. The degree of uneven static stiffness of the tyre along its circumference was estimated by the size of the tyre contact spot with the support surface. An original method for approximate determination of the tyre spot area contacting with the supporting surface is proposed. The results of determining the area of the tyre contact spot at various points with several values of air pressure in the tyre are presented.
An integrated approach to Lake Ladoga shore spatial organization with a priority for the ecological tourism development
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Proshina A. S.
Published: February 2021

The article is devoted to the issue of ecological tourism that is regarded as a priority for the development of the territorial recreational system at Lake Ladoga shore, while the role of landscape-route corridors forming recreational axes is performed by ecological routes. The organization of landscape recreation is considered as a way to solve the problem of conservation of natural complexes, the formation of the ecological framework of the territory. The article presents the results of studying the experience of planning the territories of natural parks, including the Vodlozersky National Park and offers a set of planning methods and technique for their implementation for the development of ecological tourism on the shores of Lake Ladoga. The result of the study is the proposal to create a unified spatial scheme for organizing the territory, covering the entire coastline of Lake Ladoga and combining territorial planning schemes of the Leningrad Region and the Republic of Karelia.
Modernization of the design solution of the horizontal joint of the floor slabs in the beam-free frames using seamless loop-shaped embedded parts
Authors:   Kazan State University of Architecture and Engineering, Mironova Yu. V.
Published: February 2021

There is proposed an updated design solution of horizontal joint of the floor slabs for CUB and UIKSS beam-free frames using PFEIFER loop-shaped embedded fixings. On the basis of numerical modeling, the features of its stress strain behavior during shear operation are revealed. The horizontal joint of prefabricated floor slabs with seamless looped-shaped embedded parts has been modernized and an analytical expression to determine its compliance based on the analysis of the results of numerical simulation of the shear has been obtained. There is presented a comparative analysis of the calculation results and experimental data, proving the adequacy and applicability of the proposed calculation expression and the applicability of the design solution. The new design solution of the horizontal joint of floor slabs simplifies the technology of slab installation, and its shear suppleness can be assessed as a positive factor for the construction industry.
Automated calculation and optimization of structures of prefabricated buildings from standard elements for static and dynamic effects
Authors:   Petersburg State Transport University named after Emperor Alexander I, Temnov V. G.
Published: February 2021

The article proposes to carry out an automated calculation and optimization of spatial structures of prefabricated buildings from standard elements. Mathematical models of calculation of structural systems for load-bearing capacity are submitted. There have been worked out an algorithm of calculation of structural systems with optimal parameters of structures in CAD environment for static and dynamic effects. Technical solutions of the structural system obtained on the basis of the results of theoretical research in the process of computer-aided design are presented.
Analysis of methods for analytical calculation of foundation settlement in time
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Konyushkov V. V.
Published: February 2021

Currently, there exist three main methods for calculating foundation settlement: the method of linearly compressible layer (introduced by Prof. K. E. Egorov), the method of layer-by-layer summation (described in SP 22.13330.2016), and the method of one-dimension virgin compression (a special case of the equivalent layer method introduced by Prof. N. A. Tsytovich). All the above-mentioned methods for calculating foundation settlement are based on the linear dependence of deformations on stresses. The principal differences between these methods are in taking the account of natural soil stress from its own weight, the technique of assessing the compressible soil strata and evaluating the distribution of stress in depth from external pressure. In the practice of bases and foundations design, the layer-by-layer summation method is considered to be the most highly reputable and widely used. It should be noted that each method was initially developed to solve some specific problem. However, not every engineer at present knows the limits of a particular method application for calculating foundation deformation. The article presents calculations of the non-linear settlement development in the foundation performed by various methods. Comparison with actual deformations is made based on the results of long-term monitoring of foundation settlement of a well-known building in Saint Petersburg, and recommendations are offered regarding the applicability of the discussed methods.
Architectural solutions at the reconstruction of industrial zones
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Linov V. K. , Bolotin S. A. ,   Saint Petersburg State University of Architecture and Civil Engineering, Kondratieva L. N. ,   Saint Petersburg State University of Architecture and Civil Engineering
Published: February 2021

The article considers some actual problems regarding the reconstruction of historical industrial zones in Saint Petersburg in the context of the city development general tasks. The authors analyze the world experience of using various architectural solutions at the reconstruction of industrial enterprises, taking into account environmental aspects. There are specified two types of industrial buildings and an individual approach to the reconstruction is proposed for each of them. A special type of architectural solutions is defined to the reconstruction of buildings located in coastal areas.
Quantomobile as a multi-environment vehicle
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Kotikov Ju. G.
Published: February 2021

The advance of science and technology by the beginning of the XXI century has enabled the creation of quantum engines (QuEn) using the energy of physical vacuum. This is going to lead to the re-equipment of the transport industry: the classic automobile will be transformed into the quantomobile with a quantum engine installed on it. We consider the possibility of creating a quantum - powered vehicle - a QuEn vehicle that will be able to function in all kinds of physical environment (in the air, on land and water) a multi-environment vehicle (MEV), as well as forming a model of its power balance in these kinds of environment. There are specified 10 variants of the quantomobile motion, from an air quantum helicopter (quantocraft) to a quantum submarine (quantomarine). Taking into account the previously published author's concepts of land and air versions of the quantomobile, attention is paid to its motion in the mode of the quantum submarine, which shows the possibility of significantly simplifying the design schemes of existing submarines when implementing quantum thrust on them.
Public spaces in the structure of a multifunctional complex: current trends in organization
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Eremeeva A. F.
Published: February 2021

The article considers the forms of architectural and planning organization of urban areas that provide active localization of various socio-cultural functions. Attention is focused on the nature of the system connections of these multifunctional complexes, the interaction of open and closed spaces. There are specified four basic structures (namely, dispersed, linear, perimeter, and mixed ones), their compositional and functional features are analyzed. Materials of the international practice of formation of new and reconstruction of existing facilities are highlighted. Modern trends in the public space organization are identified, namely, multi-functionality, transformability, interactivity, and environmental friendliness.
Measuring of deformations and forces in rod elements using a micrometer
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Lobovskiy M. O. , Tukkiya A. L. ,   Saint Petersburg State University of Architecture and Civil Engineering, Pyatkin P. A. ,   Saint Petersburg State University of Architecture and Civil Engineering, Khegay E. O. ,   Saint Petersburg State University of Architecture and Civil Engineering
Published: February 2021

The study of the stress-strain state (SSS) gives an indication how structural elements work in real operating conditions. The purpose of this study was to analyze the existing methods used for monitoring of buildings and structures, as well as to create a universal, inexpensive, and simple method for measuring deformations and forces in rod elements using a micrometer. As the results of laboratory tests have shown, the new method is in no way inferior to the existing electric, acoustic and strain resistance methods of SSS control, surpassing them in some parameters, such as ease of installation, mobility, security, cost-effectiveness. The accuracy of measuring forces up to 7 % assessed during laboratory tests confirms the possibility of using this method for monitoring of existing structures.
Investigation of the performance of the composite structure elements` connection: a wooden floor slab and cement-sand screed
Authors:   Industrial University of Tyumen, Mishurenko N. A. , Erenchinov S. A. ,   Industrial University of Tyumen, Bay V. F. ,   Industrial University of Tyumen, Hudyshkina N. Yu. ,   Industrial University of Tyumen
Published: February 2021

The article presents the results of the study of the performance of the composite structure elements` connection, namely, a wooden floor slab and cement-sand screed, in laboratory conditions and in numerical simulation. During the laboratory testing, there was assessed the shear bearing capacity of the connection, there were proposed methods for increasing the bearing capacity of the connection with subsequent testing of these methods, and the connection`s deformation was presented. The substantiation of selecting the physical-mechanical properties of materials for making a numerical experiment is submitted, the results of numerical simulation are presented.
Experimental study of σ - ε diagrams of concrete under uniaxial compression and the influence of freezing and thawing cycles on the form of the diagrams
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Popov V. M. , Plyusnin M. G. ,   Kostroma State Agricultural Academy
Published: February 2021

As a result of the experimental study, there was estimated the variability of the form of complete diagrams σ-ε of concrete under uniaxial compression. It is shown that the coefficients of variation of concrete deformation characteristics are comparable with the coefficient of variation of strength within one concrete class in terms of compressive strength. It was found out that the effect of freezing and thawing cycles leads not only to a decrease in the compressive strength of concrete, but also to a decrease in the ultimate deformations and the initial modulus of elasticity. Thus, when using diagram methods for calculating reinforced concrete structures, it is necessary to take into account the influence of variability not only in the strength, but also in the deformation characteristics of concrete.
Analysis of the load bearing capacity of the connection with the use of self-drilling dowels in various models of elastic failure
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Chernykh A. G. , Tran Quoc Phong ,   Saint Petersburg State University of Architecture and Civil Engineering
Published: February 2021

Currently, wooden structures characterized with high strength, low deformability and good aesthetics are being increasingly used in some areas of construction. Connections with multiple steel plates are very effective for wooden frames and trusses. In order to provide optimal connections, it is necessary to establish the relationship between the connection parameters and the load-bearing capacity of the structure. However, the technical regulations do not provide calculation methods specifically for this type of connection. There have been carried out a research and development of methods for calculating connections, an analysis of the self-drilling dowels` performance, and the factors affecting the load bearing capacity according to Eurocode 5 have been specified. The results obtained have been compared with other various research methods` results, there are offered authors` recommendations on the application of the standard in Russia.
TITANIUM-BASED COAGULANTS IN DOMESTIC WASTEWATER TREATMENT
Authors:   D. Mendeleev University of Chemical Technology of Russia, Kuzin E. N.
Published: February 2021

Introduction. Post-treatment of wastewater that has passed the stage of deep purification from biogenic elements is a pressing issue that has not been fully solved yet. Traditional reagents based on aluminum salts used to remove phosphorus compounds have a few significant drawbacks and do not always make it possible to achieve the standards established for the discharge of treated water into fishery reservoirs. Titanium-based coagulants are promising and highly effective reagents that have shown high efficiency in treating wastewater of various origins. Complex titanium-based coagulants are binary coagulants obtained by introducing hydrolysis products of titanium compounds in an amount of up to 10 % wt into the composition of traditional aluminum-based coagulants. Methods. Trial coagulation was carried out using a VELP laboratory flocculator; spectrophotometry, turbidimetry, and atomic emission spectral analysis were used to assess the purification efficiency. Results. It has been found that the use of titanium compounds and complex titanium-based coagulants can improve the efficiency of purification, as well as reduce the residual content of phosphate ion to the MPC standards. We have determined the main regularities in the use of complex titanium-based reagents and established the effect of the dose and pH of the medium on the efficiency of phosphate ion removal. It has also been found that the residual concentration of phosphate ion in treated water using titanium-based coagulants is significantly lower than when using traditional reagents. Titanium-based coagulants operate in a wider pH range, while the requirements for the residual concentration of titanium ions in treated water are much softer than for that of aluminum. It has been proved that the use of complex titanium-based reagents makes it possible to significantly intensify the processes of sedimentation and filtration of sludge formed during coagulation water treatment. Conclusion. In the course of the study, we have confirmed the prospects of using titaniumbased coagulants in domestic wastewater treatment.
Türkiye Mobilya ve Levha İşletmelerinde Verimlilik Algısı Üzerine Bir Araştırma
Authors: KIRKLIKÇI Ahmet Bora , GEDİK Tarık
Published: February 2021

Çok boyutlu bir kavram olan verimlilik, işletmelerin karlılıkları
üzerinde önemli bir yere sahiptir. Bu nedenle işletmeler verimlilik
değerlendirme yaklaşımlarını gözden geçirmeli ve sadece nicel verilerle değil,
çalışanların algılarına dayalı nitel verilerle de değerlendirme yapmalıdırlar.
Yapılan bu çalışma ile Türkiye mobilya ve levha işletmelerinde verimlilik
kavramının çalışanlarca nasıl algılandığı araştırılmaya çalışılmıştır.  Çalışma evrenini Türkiye Odalar ve Borsalar
Birliği ile Türkiye Yonga Levha Sanayicileri Derneği’ne kayıtlı bulunan 493
işletme oluşturmuştur. Çalışma kapsamında araştırmacılar tarafından
geliştirilen ve 15 maddeden oluşan Verimlilik Algısı Ölçeği kullanılmıştır.
Yapılan istatistiksel değerlendirmeler sonucunda verimlilik algısı yönünden
mobilya ve levha sektörlerinin aynı düzeyde oldukları belirlenmiştir. Ancak
limited şirket statüsünde çalışan, yenilik ya da yeni yatırım yapan ve daha az
çalışanı olan işletmelerin verimlilik algılarının diğer işletmelere göre daha
olumlu olduğu belirlenmiştir. Çalışma sonucunda işletmelerde çalışanların
verimliliği artırıcı faaliyetlere daha fazla katılımlarının sağlanması ve üst
yönetimin desteği ile verimliliğin arttırılmasında bir örgüt kültürü
oluşturulması önerilmektedir.