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Investigation on the freeze-thaw damage to the jointed plain concrete pavement under different climate conditions

Shuaicheng GUO, Qingli DAI, Jacob HILLER

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 2,   Pages 227-238 doi: 10.1007/s11709-017-0426-6

Abstract: Parameters (ECOPP) methods are conducted to obtain concrete slab elastic modulus and the subgrade -value

Keywords： LTPP     elastic modulus     <i>ki>-value     <i>IRIi>     MEPDG    

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Multi-color space threshold segmentation and self-learning <i>ki>-NN algorithm for surge test EUT status

Jian HUANG,Gui-xiong LIU

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 3,   Pages 311-315 doi: 10.1007/s11465-016-0376-z

Abstract: A multi-color space threshold segmentation and self-learning <i>ki>-nearest neighbor algorithm(<i>ki>-NN) for equipment under test status identification was proposed after using feature matchingFirst, color space (L*a*b*, hue saturation lightness (HSL), hue saturation value (HSV)) to segment waski>-NN algorithm with training set <i>Ti><i>zi> according to the feature vectorLast, while the classification confidence coefficient equaled <i>ki>, made <i>Si><

Keywords： multi-color space     <i>ki>-nearest neighbor algorithm (<i>ki>-NN)     self-learning     surge test    

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A systematic approach in load disaggregation utilizing a multi-stage classification algorithm for consumer electrical appliances classification

Chuan Choong YANG, Chit Siang SOH, Vooi Voon YAP

Frontiers in Energy 2019, Volume 13, Issue 2,   Pages 386-398 doi: 10.1007/s11708-017-0497-z

Abstract: The contribution of this paper is in utilizing the “ -value,” the number of closest data points to the

Keywords： load disaggregation     voltage-current (<i>Vi>-<i>Ii>) trajectory     multi-stage classification algorithm     principal component analysis (PCA)     <i>ki>-nearest neighbor (<i>ki>-NN)    

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Analysis of flow over backward facing step with transition

Dwarikanath RATHA,Arindam SARKAR

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 1,   Pages 71-81 doi: 10.1007/s11709-014-0270-x

Abstract: The present study deals with the study of the velocity distribution and the separation phenomenon of flow of air over a two dimensional backward facing step. The flow of air over a backward facing step has been investigated numerically using FLUENT. Flow simulation has been carried out in a backward facing step having an expansion ratio (ratio of the height before and after the step) of 1:1.94 and the results obtained are compared with the published experimental results. Comparison of flow characteristics between steps with three different transitions is made. The variation of reattachment length for all the three cases are analyzed for wide range of Reynolds number ranging from 100 to 7000 which covers the laminar, transition and turbulent flow of air. Simulation of the flow over steps with expansion ratios of 1:1.24, 1:1.38, 1:1.47, 1:1.53, 1:1.94, 1:2.20 are also carried out to examine the effect of different expansion ratios on the reattachment length. It is found that the primary reattachment length increases with increase in the expansion ratio. The primary reattachment length at the bottom wall downstream of the step is minimum for the step with round edged transition and maximum for the step with a vertical drop transition.

Keywords： Reattachment length     backward facing step     transition     flow separation     <i>ki>-<i>?i> model    

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Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM

SHEDBALE,I. V. SINGH,B. K. MISHRA

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 420-440 doi: 10.1007/s11709-015-0305-y

Abstract: The -integral for two fracture modes (mode-I and mode-II) is obtained by decomposing the displacement

Keywords： XFEM     von-Mises yield criterion     isotropic hardening     fatigue crack growth     <i>Ji>-integral    

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K+ and Na+ fluxes in roots of two Chinese Iris populations

Pinfang LI,Biao ZHANG

Frontiers of Agricultural Science and Engineering 2014, Volume 1, Issue 2,   Pages 144-149 doi: 10.15302/J-FASE-2014016

Abstract: Maintenance of ion homeostasis, particularly the regulation of K and Na uptake, is important for allObservations on ionic response to salinity and net fluxes of K , Na in the root exhibited by plantsNet fluxes of K , Na from the apex and along the root axis to 10.8 mm were measured using non-invasiveThere was a lower net efflux of K found in population Xj than by Bj in the mature zone (approximatelyPopulation Xj of continued to grow normally under NaCl stress, and maintained a higher K /Na ratio

Keywords： <i>Iris lacteai> Pall. var. <i>chinensisi> (Fisch.)Koidz     population     K+ and Na+     ion flux     non-invasive micro-test technique    

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A toughness based deformation limit for X- and K-joints under brace axial tension

Bo GU,Xudong QIAN,Aziz AHMED

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 3,   Pages 345-362 doi: 10.1007/s11709-016-0333-2

Abstract: the initiation of ductile fracture failure in fatigue-cracked circular hollow section (CHS) X- and K-jointslimits thus developed follow a linear relationship with respect to the crack-depth ratio for both X- and K-jointsComparison of the predicated deformation limit against experimental on cracked tubular X- and K-jointsextrapolated to a zero crack depth, provides an estimate on the deformation limits for intact X- and K-joints

Keywords： circular hollow section (CHS)     tubular joint     fracture failure     deformation limit     <i>Ji>-integral    

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a novel K+ transporter gene in cotton

Yiru WANG, Juan XU, Mingcai ZHANG, Xiaoli TIAN, Zhaohu LI

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 2,   Pages 226-235 doi: 10.15302/J-FASE-2017170

Abstract: K transporters are important for K uptake and transport in plants.However, information on the function of K transporters and K channels in cotton is limited.This study, identified a K transporter gene, expressed in the roots of cotton ( ) cv.(WT) regardless of K concentration supplied.external K , as well as K transport and distribution in plants.

Keywords： cotton     <i>GhKT2i>     potassium     transporter     uptake    

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Insight into the role of cholesterol in modulation of morphology and mechanical properties of CHO-K1

Lei Zhang, Lisha Zhao, Ping-Kai Ouyang, Pu Chen

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 1,   Pages 98-107 doi: 10.1007/s11705-018-1775-y

Abstract: In this study, the effects of cholesterol on the topography and mechanical behaviors of CHO-K1 cellsIncreased methyl-<i>βi>-cyclodextrin levels and incubation time could significantly increase Young’

Keywords： cholesterol     methyl-<i>βi>-cyclodextrin     atomic force microscopy     Young’s modulus     CHO-K1 cell    

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Low-k integration: Gas screening for cryogenic etching and plasma damage mitigation

Romain Chanson, Remi Dussart, Thomas Tillocher, P. Lefaucheux, Christian Dussarrat, Jean François de Marneffe

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 3,   Pages 511-516 doi: 10.1007/s11705-019-1820-5

Abstract: The aim is to protect the porous low- from plasma-induced damage and keep the -value of the material

Keywords： low-<i>ki>     nanotechnology     micro-electronics     cryo-etching     plasma processing    

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Marble epistyles under shear: an experimental study of the role of “Relieving Space”

PASIOU, I. STAVRAKAS, D. TRIANTIS, S. K. KOURKOULIS

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 4,   Pages 767-786 doi: 10.1007/s11709-019-0515-9

Abstract: The specimens are made of two marble blocks connected to each other with an “I”-shaped titanium connector

Keywords： monuments of cultural heritage     marble epistyles     pressure stimulated currents     acoustic emission     digital image correlation    

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Fatigue crack growth simulations of 3-D linear elastic cracks under thermal load by XFEM

Himanshu PATHAK,Akhilendra SINGH,I.V. SINGH,S. K. YADAV

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 359-382 doi: 10.1007/s11709-015-0304-z

Abstract: This paper deals with the fatigue crack growth simulations of three-dimensional linear elastic cracks by XFEM under cyclic thermal load. Both temperature and displacement approximations are extrinsically enriched by Heaviside and crack front enrichment functions. Crack growth is modelled by successive linear extensions, and the end points of these linear extensions are joined by cubic spline segments to obtain a modified crack front. Different crack geometries such as planer, non-planer and arbitrary spline shape cracks are simulated under thermal shock, adiabatic and isothermal loads to reveal the sturdiness and versatility of the XFEM approach.

Keywords： 3-D cracks     fatigue life     Paris law     thermal load     XFEM    

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Recycling polymeric waste from electronic and automotive sectors into value added products

Veena Choudhary, Rita Khanna, Romina Cayumil, Muhammad Ikram-ul-Haq, Veena Sahajwalla, Shiva Kumar I.

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 5, doi: 10.1007/s11783-017-0991-x

Abstract: The environmentally sustainable disposal and recycling of ever increasing volumes of electronic waste has become global waste management issue. The addition of up to 25% polymeric waste PCBs (printed circuit boards) as fillers in polypropylene (PP) composites was partially successful: while the tensile modulus, flexural strength and flexural modulus of composites were enhanced, the tensile and impact strengths were found to decrease. As a lowering of impact strength can significantly limit the application of PP based composites, it is necessary to incorporate impact modifying polymers such as rubbery particles in the mix. We report on a novel investigation on the simultaneous utilization of electronic and automotive rubber waste as fillers in PP composites. These composites were prepared by using 25 wt.% polymeric PCB powder, up to 9% of ethylene propylene rubber (EPR), and PP: balance. The influence of EPR on the structural, thermal, mechanical and rheological properties of PP/PCB/EPR composites was investigated. While the addition of EPR caused the nucleation of the β crystalline phase of PP, the onset temperature for thermal degradation was found to decrease by 8%. The tensile modulus and strength decreased by 16% and 19%, respectively; and the elongation at break increased by ~71%. The impact strength showed a maximum increase of ~18% at 7 wt.%–9 wt.% EPR content. Various rheological properties were found to be well within the range of processing limits. This novel eco-friendly approach could help utilize significant amounts of polymeric electronic and automotive waste for fabricating valuable polymer composites.

Keywords： E-waste     Polymer composites     Recycling     Rubber     Waste PCBs     Filler    

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Utilisation of waste heat from exhaust gases of drying process

Savchenko,Sergey K. Kusakov,Oleksandr I. Matsegora

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 1,   Pages 131-138 doi: 10.1007/s11705-016-1560-8

Abstract: Nowadays a lot of low-grade heat is wasted from the industry through the off- and flue-gasses with different compositions. These gases provide the sensitive heat with utilisation potential and latent heat with the components for condensation. In this paper, process integration methodology has been applied to the partly condensed streams. A hot composite curve that represents the gas mixture cooling according to equation of state for real gases was drawn to account the gas-liquid equilibrium. According to the pinch analysis methodology, the pinch point was specified and optimal minimal temperature difference was determined. The location of the point where gas and liquid phases can be split for better recuperation of heat energy within heat exchangers is estimated using the developed methodology. The industrial case study of tobacco drying process off-gasses is analysed for heat recovery. The mathematical model was developed by using MathCad software to minimise the total annualised cost using compact plate heat exchangers for waste heat utilisation. The obtained payback period for the required investments is less than six months. The presented method was validated by comparison with industrial test data.

Keywords： exhaust gas     waste heat     process integration     plate heat exchanger    

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Development of a new method for RMR and Q classification method to optimize support system in tunneling

Asghar RAHMATI,Lohrasb FARAMARZI,Manouchehr SANEI

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 4,   Pages 448-455 doi: 10.1007/s11709-014-0262-x

Abstract: this study, according to data of five deep and long tunnels in Iran, two equations for estimating the value

Keywords： <i>JHi> classification     <i>Qi> and <i>RMRi> classification     new method    

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Title Author Date Type Operation

Investigation on the freeze-thaw damage to the jointed plain concrete pavement under different climate conditions

Shuaicheng GUO, Qingli DAI, Jacob HILLER

Journal Article

Multi-color space threshold segmentation and self-learning <i>ki>-NN algorithm for surge test EUT status

Jian HUANG,Gui-xiong LIU

Journal Article

A systematic approach in load disaggregation utilizing a multi-stage classification algorithm for consumer electrical appliances classification

Chuan Choong YANG, Chit Siang SOH, Vooi Voon YAP

Journal Article

Analysis of flow over backward facing step with transition

Dwarikanath RATHA,Arindam SARKAR

Journal Article

Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM

SHEDBALE,I. V. SINGH,B. K. MISHRA

Journal Article

K+ and Na+ fluxes in roots of two Chinese Iris populations

Pinfang LI,Biao ZHANG

Journal Article

A toughness based deformation limit for X- and K-joints under brace axial tension

Bo GU,Xudong QIAN,Aziz AHMED

Journal Article

a novel K+ transporter gene in cotton

Yiru WANG, Juan XU, Mingcai ZHANG, Xiaoli TIAN, Zhaohu LI

Journal Article

Insight into the role of cholesterol in modulation of morphology and mechanical properties of CHO-K1

Lei Zhang, Lisha Zhao, Ping-Kai Ouyang, Pu Chen

Journal Article

Low-k integration: Gas screening for cryogenic etching and plasma damage mitigation

Romain Chanson, Remi Dussart, Thomas Tillocher, P. Lefaucheux, Christian Dussarrat, Jean François de Marneffe

Journal Article

Marble epistyles under shear: an experimental study of the role of “Relieving Space”

PASIOU, I. STAVRAKAS, D. TRIANTIS, S. K. KOURKOULIS

Journal Article

Fatigue crack growth simulations of 3-D linear elastic cracks under thermal load by XFEM

Himanshu PATHAK,Akhilendra SINGH,I.V. SINGH,S. K. YADAV

Journal Article

Recycling polymeric waste from electronic and automotive sectors into value added products

Veena Choudhary, Rita Khanna, Romina Cayumil, Muhammad Ikram-ul-Haq, Veena Sahajwalla, Shiva Kumar I.

Journal Article

Utilisation of waste heat from exhaust gases of drying process

Savchenko,Sergey K. Kusakov,Oleksandr I. Matsegora

Journal Article

Development of a new method for RMR and Q classification method to optimize support system in tunneling

Asghar RAHMATI,Lohrasb FARAMARZI,Manouchehr SANEI

Journal Article