bluuebunny/crossref_metadata_2025 huggingface dataset:
Brief resolved unexplained events: Retrospective validation of diagnostic criteria and risk stratification
Authors: Colombo Marco , Katz Eliot S. , Bosco Annalisa , Melzi Maria L. , Nosetti Luana
Published: December 2018

Background and Objectives

This study retrospectively evaluated the AAP guidelines for diagnosis and risk stratification of Brief Resolved Unexplained Events (BRUE) in a well‐characterized cohort of infants admitted with an Apparent Life Threatening Event (ALTE). Further, using prospective follow‐up, we endeavored to determine the safety of implementing ambulatory care for the lower risk BRUE population (LR‐BRUE) and estimate the cost‐savings of this practice.

Methods

Retrospective application of the BRUE criteria on infants younger than 12 months of age who had been admitted with an ALTE from 2006 to 2016 at a single tertiary care center in Lombardy, Italy. ALTE patients were classified into three groups; (1) Not a BRUE; (2) Lower‐risk (LR)‐BRUE; and (3) Higher‐risk (HR)‐BRUE. Patients were contacted prospectively to obtain long‐term follow‐up outcomes and medical records and billing databases were reviewed.

Results

Among the 84 infants admitted for an ALTE, 35 (42%) were not a BRUE, 16 (19%) were a LR‐BRUE, and 33 (39%) were a HR‐BRUE. Only one of the LR‐BRUE patients had a subsequent LR‐BRUE event, and was later diagnosed with a seizure disorder. Two HR‐BRUE babies had also previously presented with a LR‐BRUE. Application of the LR‐BRUE guidelines would have decreased health expenditure by 20%. There were no deaths or significant morbidities in either BRUE group.

Conclusions

Applying the recent AAP BRUE guidelines and risk stratification to a well‐characterized cohort of admitted ALTE patients is a safe and cost‐effective approach. Careful out‐patient follow‐up is recommended as one of our patients with a LR‐BRUE had a recurrence, and was subsequently diagnosed with a seizure disorder.
Effect of Substitutional Doping of Tin in Highly Conductive Barium Iron Vanadate Glass
Authors: Fujita Yuki , Masuda Sayaka , Miyamoto Hajime , Kubuki Shiro , Nishida Tetsuaki , Oka Nobuto
Published: December 2018

Vanadate glasses have numerous industrial applications and enhancement of their electrical conductivity is of interest for conducting glass for electronic and optical devices. The effect of substitutional doping of SnIV (4d10) for FeIII on the local structure and electrical conductivity (σ) of barium iron vanadate glass is investigated in this study. The σ value of as‐cast 20BaO · 3SnO2 · 7Fe2O3 · 70V2O5 glass (5.9 × 10−7 S cm−1) is comparable to that of as‐cast 20BaO · 10Fe2O3 · 70V2O5 glass. The σ value of the doped glass increases to 1.9 × 10−1 S cm−1 after isothermal annealing at 500 °C for 15 min, which is an order of magnitude larger than that of the undoped glass annealed under the same conditions. From room‐temperature Mössbauer spectra of conductive vanadate glasses annealed at 500 °C for 15 min, it is demonstrated that the quadrupole splitting of the FeIII (0.60 mm s−1) in 3 mol%‐SnO2 containing vanadate glass is slightly smaller than that of SnO2‐free vanadate glass (0.65 mm s−1). This indicates smaller distortion of FeO4 and VO4 tetrahedra in the SnO2‐containing glass compared to the undoped glass, which is responsible for a marked increase in the carrier mobility.
Comprehensive Survey of the Structures of C4, C4−, and C4+ Clusters
Authors: Wang Zerong Daniel , Withey Paul A.
Published: December 2018

Historic debates on the true structure of C4 cluster based on the experimental results of EPR, infrared spectroscopy and Coulomb explosion, as well as theoretical calculations have prompted us to comprehensively survey the geometries of C4 clusters. A total of 37 possible geometries for neutral C4, 24 C4 anions (C4−) and 27 C4 cations (C4+) have been optimized with both MP2 and density functional theory (B3LYP) calculations and verified with subsequent frequency calculations. The results align very well with all experimental observations, including the detection of rhombic C4 structure in Coulomb explosion experiment and the cis‐bent structure, in addition to the most stable linear geometries for C4 and C4−, and the electron affinity and ionization potential of C4.
Molecule‐Driven Nanoenergy Generator
Authors: Li Hui‐Jun , Zhang Darui , Wang Hongwu , Chen Zhenlu , Ou Nanquan , Wang Ping , Wang Ding , Wang Xianying , Yang Junhe
Published: December 2018

A large potential can be generated when one end of 1D and/or 2D semiconducting nanostructures such as zinc oxide (ZnO) and molybdenum disulfide is exposed to a wide spectrum of chemical molecules. A nanoenergy generator that comprises vertically aligned ZnO nanowires and poly(vinyl chloride‐co‐vinyl‐co‐2‐hydroxypropyl acrylate) is fabricated, and it can generate electricity from various molecules including gaseous species exhaled from human breath. The generated voltage, which depends sensitively on the molecular dipole moment of adsorbed chemical species and surface coverage, is significantly larger than the streaming or piezoelectric potentials and is powerful enough to directly drive a single carbon nanotube field‐effect transistor. It is demonstrated that the notion of voltage generation through molecule‐surface interactions bears general implications to other semiconducting materials, and has the advantages of simplicity, cost‐effectiveness, fast response to a wide range of molecules, and high power output, making our approach a promising tool for energy conversion and sensing applications.
Integrated likelihoods for functions of a parameter
Authors: Severini Thomas A.
Published: December 2018

Non‐Bayesian inference regarding a parameter of interest in the presence of a nuisance parameter may be based on the integrated likelihood function, in which the nuisance parameter is eliminated by averaging the likelihood function with respect to a weight function for the nuisance parameter. Recent research has shown that integrated likelihood methods work particularly well when the model is reparameterized in terms of a nuisance parameter chosen to be “unrelated” to the parameter of interest and the corresponding weight function for this nuisance parameter is chosen so that it does not depend on the parameter of interest. One choice for such a nuisance parameter is the zero score expectation (ZSE) parameter. The purpose of this note is to extend the definition of the ZSE parameter to the case in which the model has a parameter vector θ, with the parameter of interest of the model taken to be a function of θ; that is, the definition of the ZSE parameter is extended to the case in which there is not an explicit nuisance parameter for the model. The resulting integrated likelihood function has the same desirable properties as integrated likelihoods based on the ZSE parameter in models with an explicit nuisance parameter.
Report provides insights on cybersecurity
Authors: Hope Joan
Published: December 2018

Do you follow best practices to prevent a data breach and to address one if it occurs? Why Cybersecurity Matters: and What Registrars, Enrollment Managers and Higher Education Should Do About It outlines steps you can take to secure your institution's and students' data.
Tensor polarizability of the vector mesons from SU(3) lattice gauge theory
Authors: Luschevskaya E. V. , Teryaev O. V. , Golubkov D. Yu. , Solovjeva O. V. , Ishkuvatov R. A.
Published: December 2018

Abstract

The magnetic dipole polarizabilities of the vector ρ
0 and ρ
± mesons in SU(3) pure gauge theory are calculated in the article. Based on this the authors explore the contribution of the dipole magnetic polarizabilities to the tensor polarization of the vector mesons in external abelian magnetic field. The tensor polarization leads to the dilepton asymmetry observed in non-central heavy ion collisions and can be also estimated in lattice gauge theory.
(2, 2) geometry from gauge theory
Authors: Caldeira João , Maxfield Travis , Sethi Savdeep
Published: December 2018

Abstract

Using gauge theory, we describe how to construct generalized Kähler geometries with (2, 2) two-dimensional supersymmetry, which are analogues of familiar examples like projective spaces and Calabi-Yau manifolds. For special cases, T-dual descriptions can be found which are squashed Kähler spaces. We explore the vacuum structure of these gauge theories by studying the Coulomb branch, which usually encodes the quantum cohomology ring. Some models without Kähler dual descriptions possess unusual Coulomb branches. Specifically, there appear to be an infinite number of supersymmetric vacua.
Tri-direct CP in the Littlest Seesaw playground
Authors: Ding Gui-Jun , King Stephen F. , Li Cai-Chang
Published: December 2018

Abstract

We discuss spontaneously broken CP symmetry in two right-handed neutrino models based on the idea of having a different residual flavour symmetry, together with a different residual CP symmetry, associated with each of the two right-handed neutrinos. The charged lepton sector also has a different residual flavour symmetry. In such a tri-direct CP approach, we show that the combination of the three residual flavour and two residual CP symmetries provides a new way of fixing the parameters. To illustrate the approach, we revisit the Littlest Seesaw (LSS) model based on S
4 and then propose new variants which have not so far appeared in the literature, with different predictions for each variant. We analyse numerically the predictions of the new variants, and then propose an explicit model which can realise one of the successful benchmark points, based on the atmospheric flavon vacuum alignment (1, ω
2, ω) and the solar flavon vacuum alignment (1, −7/2, −7/2).
Colonoscopic findings in patients younger than 40 years
Authors: Moreira Lana Ferreira , Santos Elisângela Suzarth Gonçalves dos , Amorim Taísa Maria Brito , Leal Rafaela Mendonça , Andrade Adriana Conceição de Mello , Mendes Carlos Ramon Silveira
Published: December 2018

Objective To analyze the main endoscopic findings in patients under 40 years of age and the main indications for colonoscopy in these patients.

Methods A retrospective study with 362 reports of patients under 40 years of age who underwent colonoscopy from January 2014 to June 2017 at the colonoscopy service of the General Hospital Roberto Santos. Colon preparation was performed with mannitol and the patients underwent sedation as the anesthetist criteria.

Results Of the 362 patients analyzed, 192 (53%) were female. The mean age was 25 years (25.58 ± 11.95). The most frequent indications were inflammatory bowel disease in 24.3% (88) of the patients, bleeding in the lower digestive tract in 24% (87), and chronic diarrhea in 20.2% (73). The main colonoscopic findings were polyposis in 21.3% (77) of the patients and inflammatory alterations in 20.7% (75).

Conclusion With the analysis of the data provided by the colonoscopies, it was possible to conclude that, when the investigation is adequate and the examination is well indicated, even under the age of 40, colonoscopy can help in the diagnostic and treatment of several pathologies, including those that may increase the risk of colorectal cancer.
Viscosity, surface tension and gravity effects on acoustic reflection and refraction
Authors: Krechetnikov R.
Published: December 2018

The idea of the present work is to study from a unifying viewpoint the effects of viscosity, surface tension and gravity on acoustic reflection and refraction at a fluid interface, with the focus on modifications of Snell’s (Snell–Descartes’) law. While all these effects can be treated individually due to separation of the associated time scales, the contributions of surface tension to the gravity and viscosity cases are considered as well. The analysis reveals a number of phenomena among which are dispersive refraction laws, surface tension enhancing reflection, acoustic field generating vorticity at the interface, and viscosity enhancing/suppressing reflection as well as giving rise to extra reflected and transmitted waves.
Spectral analysis of the budget equation in turbulent channel flows at high Reynolds number
Authors: Lee Myoungkyu , Moser Robert D.
Published: December 2018

The transport equations for the variances of the velocity components are investigated using data from direct numerical simulations of incompressible channel flows at friction Reynolds number ($Re_{\unicode[STIX]{x1D70F}}$) up to$Re_{\unicode[STIX]{x1D70F}}=5200$. Each term in the transport equation has been spectrally decomposed to expose the contribution of turbulence at different length scales to the processes governing the flow of energy in the wall-normal direction, in scale and among components. The outer-layer turbulence is dominated by very large-scale streamwise elongated modes, which are consistent with the very large-scale motions (VLSM) that have been observed by many others. The presence of these VLSMs drives many of the characteristics of the turbulent energy flows. Away from the wall, production occurs primarily in these large-scale streamwise-elongated modes in the streamwise velocity, but dissipation occurs nearly isotropically in both velocity components and scale. For this to happen, the energy is transferred from the streamwise-elongated modes to modes with a range of orientations through nonlinear interactions, and then transferred to other velocity components. This allows energy to be transferred more-or-less isotropically from these large scales to the small scales at which dissipation occurs. The VLSMs also transfer energy to the wall region, resulting in a modulation of the autonomous near-wall dynamics and the observed Reynolds number dependence of the near-wall velocity variances. The near-wall energy flows are more complex, but are consistent with the well-known autonomous near-wall dynamics that gives rise to streaks and streamwise vortices. Through the overlap region between outer- and inner-layer turbulence, there is a self-similar structure to the energy flows. The VLSM production occurs at spanwise scales that grow with$y$. There is transport of energy away from the wall over a range of scales that grows with$y$. Moreover, there is transfer of energy to small dissipative scales which grows like$y^{1/4}$, as expected from Kolmogorov scaling. Finally, the small-scale near-wall processes characterised by wavelengths less than 1000 wall units are largely Reynolds number independent, while the larger-scale outer-layer processes are strongly Reynolds number dependent. The interaction between them appears to be relatively simple.
Inequality in Twentieth-Century Latin America: Path Dependence, Countermovements, and Reactive Sequences
Authors: Teichman Judith
Published: December 2018

Most recent explanations of social welfare and development outcomes have focused on the role and impact of formal institutional arrangements, particularly the state. The institutional legacies of colonial rule and the role of democratic institutions have been common explanatory variables. This article focuses on the historical origins, persistence, and increases in inequality in Mexico and Chile during the twentieth century. It argues that despite important historical economic and political institutional differences, similar processes account for the unequal distributional outcomes that characterize the two cases. Critical conjunctures involved bitter struggle between social groups. While popularly based countermovements (along the lines predicted by Karl Polyani) arose periodically and struggled to improve social conditions, these movements were unable to alter the underlying sources of inequality. By mid-twentieth century, popular pressure had been able to exact only an unequal form of embeddedness (or social protection from the market) that contributed to inequality. Further, waves of popular mobilization linked to critical conjunctures produced reactive historical sequences involving fierce resistance from propertied elites and their middle-class allies. This resistance inevitably gave rise to new conjunctures ushering in new institutional arrangements that entrenched or increased inequality. The absence of a distributive settlement between propertied classes and popular groups was at the heart of the mobilization and countermobilization cycles in both cases; indeed, it was the depth of this disagreement, particularly the disagreement over private property, that fueled reactive sequences and their unequalizing outcomes.
Voting on Prohibition: Disentangling Preferences on Alcohol and Decentralization
Authors: Dinan John , Heckelman Jac C.
Published: December 2018

We contribute to an understanding of the determinants of voter support for US prohibition policies in the early 1900s, by separating substantive preferences for wet versus dry policies from preferences for centralized versus decentralized control. Prior studies of prohibition referenda have generated various conclusions about which groups supported and opposed prohibition, whether regarding the role of religion, urban/rural residence, immigrant status, gender, or class. But none of these studies has considered the impact of preferences regarding decentralization on voter support for prohibition measures. We exploit a combination of referenda unique to the 1933 Ohio ballot, where voters considered prohibition-repeal measures alongside a county home-rule amendment. By viewing support for home rule as a proxy for decentralization preferences we clarify and explain anomalies in prior studies regarding determinants of support for prohibition and its repeal, especially regarding urban counties and some evangelical denominations, which are shown to have been guided by a preference for local control of alcohol policy, and counties with larger proportions of women, which are associated with greater support for more centralized and uniform alcohol policy.
System Identification and Data‐Driven Forecasting of AE Index and Prediction Uncertainty Analysis Using a New Cloud‐NARX Model
Authors: Gu Y. , Wei Hua‐Liang , Boynton Richard J. , Walker Simon N. , Balikhin Michael A.
Published: December 2018

Severe geomagnetic storms caused by the solar wind disturbances have harmful influences on the operation of modern equipment and systems. The modeling and forecasting of AE index are extremely useful to understand the geomagnetic substorms. This study presents a novel cloud‐nonlinear autoregressive with exogenous input (NARX) model to predict AE index 1 hr ahead. The cloud‐NARX model provides AE index forecasting results, with a correlation coefficient of 0.87 on the data of whole year 2015. The benchmarks on the data of the two interested periods of 17–21 March 2015 and 22–26 June 2015 are presented. The presented model uses uncertainty “cloud” model and cloud transformation to quantify the uncertainty throughout the structure detection, parameter estimation, and model prediction. The new predicted band can be generated to forecast AE index with confidence interval. The proposed method provides a new way to evaluate the model based on uncertainty analysis, revealing the reliability of model, and visualize the bias of model prediction.
Molecular comparison of Neanderthal and Modern Human adenylosuccinate lyase
Authors: Van Laer Bart , Kapp Ulrike , Soler-Lopez Montserrat , Moczulska Kaja , Pääbo Svante , Leonard Gordon , Mueller-Dieckmann Christoph
Published: December 2018

The availability of genomic data from extinct homini such as Neanderthals has caused a revolution in palaeontology allowing the identification of modern human-specific protein substitutions. Currently, little is known as to how these substitutions alter the proteins on a molecular level. Here, we investigate adenylosuccinate lyase, a conserved enzyme involved in purine metabolism for which several substitutions in the modern human protein (hADSL) have been described to affect intelligence and behaviour. During evolution, modern humans acquired a specific substitution (Ala429Val) in ADSL distinguishing it from the ancestral variant present in Neanderthals (nADSL). We show here that despite this conservative substitution being solvent exposed and located distant from the active site, there is a difference in thermal stability, but not enzymology or ligand binding between nADSL and hADSL. Substitutions near residue 429 which do not profoundly affect enzymology were previously reported to cause neurological symptoms in humans. This study also reveals that ADSL undergoes conformational changes during catalysis which, together with the crystal structure of a hitherto undetermined product bound conformation, explains the molecular origin of disease for several modern human ADSL mutants.
Minimalist linkers suitable for irreversible inhibitors in simultaneous proteome profiling, live-cell imaging and drug screening
Authors: Guo Cuiping , Chang Yu , Wang Xin , Zhang Chengqian , Hao Piliang , Ding Ke , Li Zhengqiu
Published: December 2018

A series of minimalist linkers were developed and have been demonstrated to be suitable for irreversible inhibitors in simultaneous proteome profiling, live-cell imaging and drug screening, thus facilitating the discovery of first-in-class anticancer drugs.
Iridium-catalyzed 1,5-(aryl)aminomethylation of 1,3-enynes by alkenyl-to-allyl 1,4-iridium(i) migration
Authors: Ruscoe Rebecca E. , Callingham Michael , Baker Joshua A. , Korkis Stamatis E. , Lam Hon Wai
Published: December 2018

A novel multicomponent coupling reaction involving the iridium-catalyzed 1,5-difunctionalization of 1,3-enynes with arylboronic acids and triazinanes is described.
Solid state photodimerization of 9-tert-butyl anthracene ester produces an exceptionally metastable polymorph according to first-principles calculations
Authors: Beran Gregory J. O.
Published: December 2018

Molecular crystal engineering seeks to tune the material properties by controlling the crystal packing.
Comment on “Spectroscopic properties and location of the Ce3+ energy levels in Y3Al2Ga3O12 and Y3Ga5O12 at ambient and high hydrostatic pressure” by S. Mahlik, A. Lazarowska, J. Ueda, S. Tanabe and M. Grinberg, Phys. Chem. Chem. Phys., 2016, 18, 6683
Authors: Wang Yongjie , Głowacki M. , Berkowski M. , Kamińska A. , Suchocki Andrzej
Published: December 2018

The temperature dependence of the band-gap energy affects the evaluation of the energy positions of rare-earth 4f levels in relation to the vacuum level.
Rotational (de)-excitation of cyclic and linear C3H2 by collision with He
Authors: Ben Khalifa M. , Sahnoun E. , Wiesenfeld L. , Khadri F. , Hammami K. , Dulieu O. , Spezzano S. , Caselli P.
Published: December 2018

In astrochemistry, the carbenes c- and l-C3H2 are the lightest hydrocarbons to be detectable by rotational spectroscopy. We compute their interaction energy with helium atoms and the collisional quenching rates.
Highly efficient palladium-catalysed carbon dioxide hydrosilylation employing PMP ligands
Authors: Steinhoff Patrick , Paul Melanie , Schroers Julian P. , Tauchert Michael E.
Published: December 2018

A series of zero-valent Pd complexes featuring PMP ligands (M = LiI, CuI, ZnII) is reported. An excellent activity in chemoselective CO2 hydrosilylation producing silyl formate is observed (TOF1/2 = 3000 h−1).
Janus nanoparticles for contrast enhancement of T1–T2 dual mode magnetic resonance imaging
Authors: Deka Kashmiri , Guleria Anupam , Kumar Dinesh , Biswas Jayeeta , Lodha Saurabh , Kaushik Som Datta , Choudhary Saynaz A. , Dasgupta Suman , Deb Pritam
Published: December 2018

MnFe2O4@MnO Janus nanoparticles efficiently enhances contrast of both T1 and T2 based MR Images.
On-chip refractive index cytometry for whole-cell deformability discrimination
Authors: Leblanc-Hotte Antoine , Sen Nkwe Nadine , Chabot-Roy Geneviève , Affar El Bachir , Lesage Sylvie , Delisle Jean-Sébastien , Peter Yves-Alain
Published: December 2018

On-chip refractive index cytometry (RIC) achieves enhanced discrimination of cells by simultaneously probing the refractive index and whole-cell deformability.
Nitrogen-doped carbon dots derived from electrospun carbon nanofibers for Cu(ii) ion sensing
Authors: Li Yang , Liu Zhicheng , Bai Lu , Liu Yaqing
Published: December 2018

Nitrogen-doped carbon dots were synthesizedviathe chemical breakdown of electrospun polyacrylonitrile-based carbon nanofibers and employed as a fluorescent sensing platform.
Biosynthesis of bioactive natural products from Basidiomycota
Authors: Lin Hsiao-Ching , Hewage Ranuka T. , Lu Yuan-Chun , Chooi Yit-Heng
Published: December 2018

The club fungi, Basidioycota, produce a wide range of bioactive compounds. Here, we describe recent studies on the biosynthetic pathways and enzymes of bioactive natural products from these fungi.
Correction: A nickel-based pectin coordination polymer as an oxygen reduction reaction catalyst for proton-exchange membrane fuel cells
Authors: Kadirov M. K. , Minzanova S. T. , Nizameev I. R. , Mironova L. G. , Gilmutdinov I. F. , Khrizanforov M. N. , Kholin K. V. , Khamatgalimov A. R. , Semyonov V. A. , Morozov V. I. , Kadirov D. M. , Mukhametzyanov A. R. , Budnikova Yu. H. , Sinyashin O. G.
Published: December 2018

Correction for ‘A nickel-based pectin coordination polymer as an oxygen reduction reaction catalyst for proton-exchange membrane fuel cells’ by M. K. Kadirov et al., Inorg. Chem. Front., 2018, 5, 780–784.
Influenza virus N-linked glycosylation and innate immunity
Authors: York Ian A. , Stevens James , Alymova Irina V.
Published: December 2018

Influenza viruses cause seasonal epidemics and sporadic pandemics in humans. The virus’s ability to change its antigenic nature through mutation and recombination, and the difficulty in developing highly effective universal vaccines against it, make it a serious global public health challenge. Influenza virus’s surface glycoproteins, hemagglutinin and neuraminidase, are all modified by the host cell’s N-linked glycosylation pathways. Host innate immune responses are the first line of defense against infection, and glycosylation of these major antigens plays an important role in the generation of host innate responses toward the virus. Here, we review the principal findings in the analytical techniques used to study influenza N-linked glycosylation, the evolutionary dynamics of N-linked glycosylation in seasonal versus pandemic and zoonotic strains, its role in host innate immune responses, and the prospects for lectin-based therapies. As the efficiency of innate immune responses is a critical determinant of disease severity and adaptive immunity, the study of influenza glycobiology is of clinical as well as research interest.
Technological Features of Production Calcium-Alginate Microcapsules for Self-Healing Asphalt
Authors: Inozemtcev Sergey , Korolev Evgeniy
Published: December 2018

The effect of the formulation factors of calcium-alginate suspension preparation on the properties of calcium-alginate microcapsules was studied. The maximum useful volume of the reducing agent is set it was established, up to 93.8% of the total volume, in microcapsules, from the beating, to retain 2.31% sodium alginate and 10.5% reducing agent. The proposed mechanism for the formation of calcium-alginate capsules, which occurs due to shrinkage during the drying of a single drop of suspension, breaking the emulsion and forming an integral shell with a nucleus from the reducing agent.
Preliminary results of dry Deep Soil Mixing soil-cement composite testing
Authors: Jendrysik Klaudia , Kiecana Monika , Szabowicz Hubert
Published: December 2018

This paper provides results of testing made for soil-cement mixtures in dry mixing technology. This technology is greatly dependent on existing soil condition; hence the results are of highly random nature. Material used in testing was distinguished with high organic content and low humidity. Tests were carried out in laboratory of Wroclaw University of Technology on 145 samples as ordered by Menard Polska Ltd. Company. Samples were prepared and stored under laboratory conditions and then, after various maturation time, were destroyed in a testing machine. The purpose was to determine the stress-strain curves used to find strength properties, strain at failure, modulus of elasticity, secondary modulus of elasticity versus cement content. Test confirmed improvement of soil strength properties after addition of cement binder. The results may be used to determine the most economic binder-to-soil ratio.
The investigation of multi-walled carbon nanotubes dispersion and its influence on rheological properties of cement systems
Authors: Skripkiunas Gintautas , Yakovlev Grigory , Karpova Ekaterina
Published: December 2018

The current research is devoted to the studying of multi-walled carbon nanotubes (MWCNT) dispersion and its influence on the rheological properties of cement pastes. The pH and electrical conductivity test, zeta potential measurements, particle size analysis were performed for characterization of MWCNT dispersion. The MWCNT dispersion were tested during 1 month and presented the decrease of pH level from 8.89 to 8.02, increase of electrical conductivity from 2.00 to 2.75 mS/cm. The particle size analysis did not reveal the significant changes during 1 month of storage. The rheological test of nanomodified cement pastes were performed for concentration of MWCNT dispersion in the range from 0 to 0.5% by weight of cement. The decrease of yield stress by 30.7% and increase of plastic viscosity by 29.6% were obtained for cement paste modified by MWCNT dispersion in dosage of 0.25% by weight of cement. The changes in flow behaviour were established for cement pastes tested in 5 min after mixing and were not observed for cement pastes tested after 120 min of mixing.
Peculiarities of the temperature mode of operation of asphalt in airfield coatings
Authors: Ramos A. , Kotlyarsky Eduard , Vasilev Y. , Talalay V. , Sarichev I.
Published: December 2018

The article makes an attempt to theoretically substantiate the need to take into account the increase in the temperature of the asphalt concrete aerodrome covering when the jet jets of aircraft aircraft are re-peatedly exposed to the surface of the coating not only when calculating the thermodynamic stability of the upper layer at a jet velocity equal to or exceeding 100 m / s but also for other operational conditions. This will re-duce the risks of plastic deformation, likely jet erosion, potholes, even at the design stage and apply asphalt mixes with specified properties for the top coat.

Based on the laws of transfer of thermal energy, a theory was devel-oped for calculating the temperature variation on the surface of the coating and the temperature distribution over the depth of the layer, from the effect of gas jets. The depth of heating by the gas jet of the upper asphalt-concrete layer and the factors determining this value are determined.

The theoretical dependences describing the change in the temperature of the surface of the coating from the action of gas jets and the propagation of temperature fields along the thickness of the structure are revealed. The results of calculations of the temperature of the upper asphalt-concrete lay-er of the coating under the action of gas jets and in their absence in various operational and climatic conditions are presented on the example of the Republic of Peru.
The use of pulverized wastes of basalt production as a filler of gypsum compositions
Authors: Petropavlovskaya Victoria , Pustovgar Andrey , Buryanov Aleksandr , Novichenkova Tatiana , Zavad'ko Mariya
Published: December 2018

These studies are aimed at improving the performance of gypsum materials and products by using in their composition waste production of basalt fibers. The purpose of this study is to prove the possibility of using waste production of basalt fibers as a filler in gypsum composites. As the main materials used gypsum binder (Samara), as well as waste production of basalt fibers (Tver production). The positive effect of the waste is due to the participation of soluble minerals of basalt in the processes of hardening of gypsum binder. Also, the waste particles form a more perfect structure of gypsum stone., filling the pore space. It is revealed that the use of waste production of basalt fibers is advisable to use as a filler in gypsum composites.
Applying the dimensional method for valuation of the strength loss of cement compositions exposed to elevated temperatures
Authors: Levashov Nikita , Akulova Marina , Potemkina Olga , Sokolova Alla , Sokolova Yulia
Published: December 2018

The paper presents the basis of the analytical model for calcu-lating the loss of strength in ce-ment compositions exposed to elevated temperatures. This model is to replace the classical method of calculating the fire resistance of the loss of load-bearing capacity. The experimental data were taken as initial indicators. Based on the implemented calculations it would become possible to predict the occurrence of ultimate state by loss strength and the reliability of practical indicators obtained by means of full-scale tests
Assessment of reliability and accident risk for industrial buildings
Authors: Permyakov Mikhail , Ilyin Alexander , Andreev Vladimir , Voronin Konstantin , Krasnova Tamara
Published: December 2018

The methodology contains principal provisions on defining reliability and accident risk of industrial buildings and establishes requirements necessary to identify the life expectancy of a building. The methods are intended to be used in diagnostics and identification of the technical condition and life expectancy of buildings that exceeded the lifespan established in their design, reference documentation or after accidents and renovations.
Determination of dynamic durabilities and dynamic strength of armature in the elements of the constructive system at its flash structural restructuring
Authors: Fedorova Nataliya
Published: December 2018

The results of modeling and computational analysis of the static-dynamic deformation of the reinforced concrete frame-and-rod system are presented for special emergency actions caused by the sudden removal of one of the supporting elements. On the basis of energy, without the apparatus of the dynamics of structures, analytical dependences are constructed to determine the increments of the dynamic extensions in the stretched armature and the dynamic strength of the reinforcement in the sections of the frame elements under the indicated effects on the first half-wave of the structure's oscillations. Verification of the proposed analytical dependencies is performed by comparing the theoretical values of the calculated parameters with the experimental data. It is shown that the constructed analytical dependencies allow to determine quite strictly the investigated dynamic parameters of deformation of the loaded reinforced concrete framed structural systems of buildings and structures under their dynamic overloading by special emergency action associated with sudden structural reorganization of the structural system.
Consideration of fire risks in construction on the basic of territories typology
Authors: Minaev Vladimir , Korobets Boris , Dao Tuan , Tuan Anh Phan
Published: December 2018

Subject of the study: The article considers assessments of fire risks in Vietnamese typological clusters. A set of factors characterized by economic, social, demographic, climatic indicators, as well as indicators that take into account processes of urbanization, electrification, trade and transport development, affecting both construction industry functioning and fire services activities in clusters are considered in building typology.

Goal of the study: Triune and aimed at territories fire risks typology on the basic of cluster analysis – assessment of territorial differences in fire risks – justification models of optimal management of fire service resources in territorial clusters.

Materials and methods: Methodological basis for fire risks assessment is the integral fire risks theory. Trends for each province in Vietnam from 2006 to 2016, and their averaged indicator for the same years are considered.

Results: In term of fire risks, five homogeneous clusters of provinces are identified.

Conclusions: Obtained typology in Vietnam makes it possible to develop practical recommendations for authorities, industries, including construction one, and fire service, on improving management of territorial resources taking into account fire risks, interaction between regional operational services, enhancing legal and regulatory support for insurance in construction industry.
Research on the maximum fire smoke temperature beneath tunnel ceilings using longitudinal ventilation
Authors: Yang Hui , Dong Bingyan , Zhang Sijian , Sun Dahui , Lushin Kirill
Published: December 2018

The maximum fire smoke temperature beneath tunnel ceilings using longitudinal ventilation was studied by both small-scale experiments and numerical simulations for a small heat release rate (HRR) fire. And then, the accuracy of the numerical simulation is verified. A numerical simulation is subsequently employed to modify the Kurioka model for cases in large HRR. Then, the modified Kurioka model is verified by various on-site high HRR fire experimental results conducted by other authors.
Quantitative GPR inspection of quasi-homogeneous ground layers
Authors: Yavna Victor , Khakiev Zelimkhan , Lazorenko Georgy , Kasprzhitskii Anton , Sulavko Sergey
Published: December 2018

This work covers methods of GPR monitoring of constructions that are quasi-homogeneous ground layers. The monitoring methods include the determination of complex dielectric permittivity and moisture of the construction layers of highways and railways. In order to obtain quantitative values of these parameters the GPR method is calibrated via the measurement of these quantities using the resonance method at frequencies close to the central frequency of the microwave radiation used.
Modular system in the development of pre-school buildings
Authors: Shirokova Olga , Pavlyuk Alena
Published: December 2018

The present work is devoted to the study of the possibility of applying an integrated modular approach in the development of buildings for children's educational institutions. Three aspects of the problem are considered. Firstly - the need to comply with the requirements for the device, content and organization of the mode of operation of children's preschool organizations. Secondly - ensuring urban planning maneuverability of structures. Parameters of the premises of a children's institution allow using a single module for any functional area. Thus, it is possible to arrange individual function blocks in different ways, and, by changing the number of units, vary the filling number of a children. Thirdly, the integration of architectural design with the simultaneous design of developing territorial complexes - locales in children's educational institutions.
Using of carbon fiber fabric for reinforcement the walls of the aerated concrete blocks in buildings, constructed in seismic regions
Authors: Dzhamuev Bulat
Published: December 2018

We conducted experimental investigation of the strength masonry of aerated concrete blocks, reinforced by carbon fiber fabric. Reviewed various schemes of reinforcement. A comparison of the strength of non - reinforced walls with walls reinforced by carbon fiber are shown. Were carried out the tests of prototypes fragments of walls and the walls in life-size on the static and dynamic loads. According to the results of tests are given recommendations on the use of walls, reinforced by carbon fiber in seismic regions of Russia.
Definition of the inspection criteria for personal protective equipment (for work at heights) on example of full body harnesses
Authors: Vasilenko Vasily , Korolchenko Dmitry , Nam Thanh Pham
Published: December 2018

Works at heights can be unit in the separate sector of works which requires increased risk control and labor protection measures. According to the accident statistics this sector is one of the most hazardous and problematic. The problem of application of full body harnesses to protect workers against the risks of falling from heights is considered in this article. Herewith the importance of operational aspects revealed after purchase of applicable certified personal protection equipment for work at heights (further PPE) is particularly noted. Features of technical/detailed inspections of PPE and training of experts in this field in Russian Federation are presented. The analytical part of the article contains basic information about main damages and standard defects of full body harnesses which could become the basis of a normative document (further ND) for PPE inspection. ND in turn would help to form the general inspection criteria for PPE of various types, and would become normative «foundation» to train specialists. It is shown that GOST R EN 365 need to be reformed in accordance with priorities of domestic market.
Modeling heat transfer process in soils
Authors: Ofrikhter Ian , Zaharov Alexander , Ponomaryov Andrey , Likhacheva Natalia
Published: December 2018

In this paper, a new model is presented for calculating the thermal conductivity of soils, and the main provisions for the derivation of analytical formulas are given. The presented model allows taking into account the density, moisture content and temperature of the soil base. The technique presented in the paper makes it possible to dispense with laborious experiments to estimate the thermal conductivity of the soil. The method of analytical calculation is step by step presented in the paper. Two variants of using the method are proposed:

1) Less accurate method, for preliminary evaluation, without the need to take probe and conduct experiments.

2) More accurate method, with at least one experiment with a disturbed or undisturbed sample.

The results of comparison of calculated values of thermal conductivity and experimental data are presented.
Multi-criterion parameters optimization of the heat exchanger element air heating system of a building
Authors: Melekhin Andrei
Published: December 2018

Air heating systems of buildings are resource-consuming systems, for this reason, improving their resource efficiency appears to be of great significance. The author have developed a mathematical model of process of heat exchange in heat exchange surfaces of apparatuses with the solution of multicriteria optimization problem, an optimal range of managed parameters influencing the process of heat exchange with minimal metal consumption and the maximum heat output fin heat exchanger, the regularities of heat exchange process with getting generalizing dependencies distribution of temperature on the heat-release surface of the heat exchanger engineering systems of buildings, defined convergence of the results of research in the calculation on the basis of theoretical dependencies and solving mathematical model. Finding the best managed of the parameters of the heat exchanger element air heating system of a building is possible with the developed by the author of a comprehensive method of research based on multi-criteria parameters optimization with the introduction of empirically obtained data.
Applying Automated and Robotic Means in Construction as a Factor for Providing Constructive Safety of Buildings and Structures
Authors: Shutin Denis , Malakhov Aleksander , Marfin Kirill
Published: December 2018

The paper considers introduction of automated and robotic means in the construction industry, in particular for building from block materials, and its possible impact at improvement of building process quality and reliability of buildings and structures. Currently, manual labor is used for most operations during the block-laying process. Unstable quality of manual labor causes numerous defects that are detected during the technical inspection and monitoring of buildings and structures. Simultaneously, the current technological level is enough high for developing automated and robotic means for main operations in the considered process. At the same time there is the issue of ensuring the quality of the operations performed by such devices. The most significant limiting factor is measurement means, like sensors and algorithms used for processing the data obtained from the sensors. Thus, the basic requirements to the measurement means based on the current standards have been formulated during this research. Applying the automated and robotic means meeting these requirements will allow improve the block-laying process qualitatively, both in terms of its performance and in terms of reliability of the resulting constructions.
Computer modeling influence lines of farm elements
Authors: Kudryavtsev Evgenij
Published: December 2018

The article describes process of computer modeling of influence lines of each element of any section of farms with parallel belts and with diagonal elements in system Mathcad. The algorithm calculates and shows an influence lines in any chosen farm elements in any farm section with parallel belts and with diagonal elements. The proposed procedures of modeling an influence lines allow to decrease time and costs on execution of such calculations as minimum in ten times and efficiently to execute researches when farm elements parameters change.
Determination of the granulometric composition parameters of the grinding product in a ball mill
Authors: Sharapov Rashid
Published: December 2018

The article deals with the issue of the formation of the grain composition of the comminuted material inside the drum of a ball mill. The approach to the calculation of the grain composition at its transition from a larger fraction from a smaller fraction is presented. The proposed approach was tested on an industrial cement ball mill and confirmed on an experimental installation. This approach allows you to determine the parameters of the kinetics of grinding, depending on the design parameters used ball mills.
Current Issues of Mobile Cranes Unification
Authors: Kaytukov Batraz , Stepanov Michail
Published: December 2018

The issue of unification of key parts of mobile cranes unification is under study. An explicit comparative analysis of the state of production of mobile cranes in Russia and abroad was carried out. The unit-modular method of completing of crane mechanisms is offered. Creation of efficient unified planetary modular gear trains for mobile
Optimization of flat-oval pipes and perspectives of their application in beam structures
Authors: Marutyan Alexander , Kobaliya Tamazi , Galdin Evgeny
Published: December 2018

A new technical solution for re-profiling round tubes into flat-oval ones with a ratio of 1 / 3,064 is presented, which increases their bending strength. The calculation of the optimal parameters of thin-walled sections of the flat-oval shape is given by an approximate method, the correctness of which is confirmed by testing from the standard profiles used. This calculation is repeated with respect to thin-walled sections of the oval shape. The whole diagram of changes in the design parameters of flat-oval and oval pipes is presented in the transformation of their cross-sections from vertical configurations to horizontal ones, including the transition through the outline of a circular shape. The comparative analysis of optimized cross sections of flat oval, oval and round tubes is carried out taking into account the elastic and elastic-plastic deformations of the structural material, where the length of the midline of the thin-walled section is taken as the dividing line between these deformations. The choice is substantiated in favour of flat-oval profile pipes due to their simpler shape including faces of constant curvature (flat and semi-circular), relatively low cost, lower height, greater compactness, higher resistance moment.