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emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete under freeze–thawcycling

Frontiers of Structural and Civil Engineering   Pages 1341-1356 doi: 10.1007/s11709-023-0988-4

Abstract: This study empirically investigated the influence of freeze–thaw cycling on the dynamic splitting tensileThe results quantified using the freeze–thaw damage factor defined in this paper indicate that the degreeof damage to SFRC caused by freeze–thaw cycling was aggravated with increasing loading rate but mitigatedFreeze–thaw action had little effect on the crack types observed during the early and middle stages ofcycling.

Keywords： steel fiber reinforced concrete     freeze–thaw cycling     Brazilian disc splitting test     acoustic emission    

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Experimental investigation on freeze−thaw durability of polymer concrete

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 1038-1046 doi: 10.1007/s11709-021-0748-2

Abstract: Freeze–thaw is one such test that indicates the ability of concrete to last a long time without a significantIn this study, the freeze–thaw resistance of polymer concrete containing different polymer contents waselasticity, and residual compressive strength were determined for all types of concretes subjected to freeze–thawthat polymer concrete (PC) specimens prepared with higher dosages of polymer contents possessed better freeze–thaw

Keywords： durability test     freeze-thaw resistance     polymer concrete     residual compressive strength     ASTM C666-15    

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Stress-strain relationship of concrete in freeze-thaw environment

ZOU Chaoying, ZHAO Juan, LIANG Feng

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 2,   Pages 184-188 doi: 10.1007/s11709-008-0029-3

Abstract: Adopting the ASTM C666 quick freeze-thaw method, freeze-thaw tests with the number of freeze-thaw cycleswere observed by means of scanning electron microscopy (SEM) in order to detect damages caused by the freeze-thawfrozen-thawed specimens were tested on monotonic axial load; stress-strain testing curves after the freeze-thawThe testing results show that with the increasing time of freeze-thaw cycles, both the internal micro-structuresreference for further research on the behavior and the calculation model of concrete structures in a freeze-thaw

Keywords： stress-strain theoretical     freeze-thaw     capacity     reference     eighteen concrete    

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Influence of freeze–thaw damage gradient on stress–strain relationship of stressed concrete

Frontiers of Structural and Civil Engineering   Pages 1326-1340 doi: 10.1007/s11709-023-0014-x

Abstract: Influence of freeze–thaw damage gradient on stress–strain relationship of stressed concrete

Keywords： strain relationship concrete    

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

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: Freeze-thaw damage is one of the main threats to the long time performance of the concrete pavement inThis project aims to evaluate the influence of the freeze-thaw damages on pavement distresses under differentBased on the Long-Term Pavement Performance (LTPP) data base, the freeze-thaw damage generated by fourdifferent kinds of climate conditions are considered in this project: wet-freeze, wet-non freeze, dry-freezeThese results showed the reasonable freeze-thaw damage development with pavement service life and under

Keywords： LTPP     elastic modulus     k-value     IRI     MEPDG    

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Influence of construction-induced damage on the degradation of freeze–thawed lightweight cellular concrete

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 781-792 doi: 10.1007/s11709-021-0733-9

Abstract: construction-induced damage can be more significant than those from the service environment of LCC, such as freeze–thaw

Keywords： lightweight cellular concrete     construction-induced damage     freeze-thaw action     microstructure     degradation    

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MANURE AND METROPOLES---A GLOBAL FRAMEWORK FOR NUTRIENT CYCLING IN FOOD SYSTEMS

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,

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Biosorption of Cr(III) from aqueous solution by freeze-dried activated sludge: Equilibrium, kinetic and

Qian YAO, Hua ZHANG, Jun WU, Liming SHAO, Pinjing HE,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 3,   Pages 286-294 doi: 10.1007/s11783-010-0025-4

Abstract: Batch biosorption experiments were conducted to remove Cr(III) from aqueous solutions using activated sludge from a sewage treatment plant. An investigation was conducted on the effects of the initial pH, contact time, temperature, and initial Cr(III) concentration in the biosorption process. The results revealed that the activated sludge exhibited the highest Cr(III) uptake capacity (120 mg·g) at 45°C, initial pH of 4, and initial Cr(III) concentration of 100 mg·L. The biosorption results obtained at various temperatures showed that the biosorption pattern accurately followed the Langmuir model. The calculated thermodynamic parameters, Δ (−0.8– −4.58 kJ·mol), Δ (15.6–44.4 kJ·mol), and Δ (0.06–0.15 kJ·mol·K) clearly indicated that the biosorption process was feasible, spontaneous, endothermic, and physical. The pseudo first-order and second-order kinetic models were adopted to describe the experimental data, which revealed that the Cr(III) biosorption process conformed to the second-order rate expression and the biosorption rate constants decreased with increasing Cr(III) concentration. The analysis of the values of biosorption activation energy ( = −7 kJ·mol) and the intra-particle diffusion model demonstrated that Cr(III) biosorption was film-diffusion-controlled.

Keywords： activated sludge     biosorption     chromium     film diffusion     kinetics     thermodynamics    

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SOIL NITROGEN CYCLING AND ENVIRONMENTAL IMPACTS IN THE SUBTROPICAL HILLY REGION OF CHINA: EVIDENCE FROM

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 3,   Pages 407-424 doi: 10.15302/J-FASE-2022448

Abstract:

● Soil nitrogen fluxes and influencing factors were reviewed in the subtropical hilly regions.

Keywords： nitrogen cycling     soil nitrogen     nitrogen deposition     greenhouse gases emission     non-point source pollution    

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Elastic modulus and thermal stress in coating during heat cycling with different substrate shapes

Daniel GAONA,Alfredo VALAREZO

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 3,   Pages 294-300 doi: 10.1007/s11465-015-0351-0

Abstract:

The elastic modulus of a deposit (Ed) can be obtained by monitoring the temperature (?T) and curvature (?k) of a one-side coated long plate, namely, a one-dimensional (1D) deformation model. The aim of this research is to design an experimental setup that proves whether a 1D deformation model can be scaled for complex geometries. The setup includes a laser displacement sensor mounted on a robotic arm capable of scanning a specimen surface and measuring its deformation. The reproducibility of the results is verified by comparing the present results with Stony Brook University Laboratory’s results. The ?k-?T slope error is less than 8%, and the Ed estimation error is close to 2%. These values reveal the repeatability of the experiments. Several samples fabricated with aluminum as the substrate and 100MXC nanowire (Fe and Cr alloy) as the deposit are analyzed and compared with those in finite element (FE) simulations. The linear elastic behavior of 1D (flat long plate) and 2D (squared plate) specimens during heating/cooling cycles is demonstrated by the high linearity of all ?k-?T curves (over 97%). The Ed values are approximately equal for 1D and 2D analyses, with a median of 96 GPa and standard deviation of 2 GPa. The correspondence between the experimental and simulated results for the 1D and 2D specimens reveals that deformation and thermal stress in coated specimens can be predicted regardless of specimen geometry through FE modeling and by using the experimental value of Ed. An example of a turbine-blade-shaped substrate is presented to validate the approach.

Keywords： in-plane     Young’s modulus     curvature temperature     thermal stress     coating    

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MANURE AND METROPOLES—A GLOBAL FRAMEWORK FOR NUTRIENT CYCLING IN FOOD SYSTEMS

Daan VERSTAND, Theun VELLINGA, Krijn POPPE, Pieter de WOLF

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,   Pages 182-187 doi: 10.15302/J-FASE-2020364

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Intracellular trehalose improves the survival of human red blood cells by freeze-drying

HE Hui, LIU Baolin, HUA Zezhao, LI Chuan, WU Zhengzheng

Frontiers in Energy 2007, Volume 1, Issue 1,   Pages 120-124 doi: 10.1007/s11708-007-0014-x

Abstract: Freeze-drying of human red blood cells has a potential important application for blood transfusion.was to investigate the effects of intracellular trehalose on the survival of red blood cells after freeze-dryingblood cells were incubated in trehalose solutions of various concentrations at 37vH for 7 h following freeze-dryingTrehalose, sodium citrate, and human serum albumin were used as extracellular protective agents for the freeze-dryingThe viability of freeze-dried red blood cells increased with the increment of intracellular trehalose
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biomass-derived carbon loaded with MnO as lithium-ion battery anode for improving its reversible capacity and cycling

Frontiers of Chemical Science and Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11705-023-2376-y

Abstract: However, improving the reversible capacity and cycling performance remains a long-standing challenge.high current density of 1.0 A·g–1, KAC@MnO2 still exhibits excellent long-term cyclinganode materials, the KAC@MnO2 prepared in this work shows superior reversible capacity and cycling

Keywords： biomass-derived carbon     MnO2     lithium-ion batteries     anode material     high reversible capacity    

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Characterization of the genes involved in nitrogen cycling in wastewater treatment plants using DNA microarray

Junqin PANG, Masami MATSUDA, Masashi KURODA, Daisuke INOUE, Kazunari SEI, Kei NISHIDA, Michihiko IKE

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 4, doi: 10.1007/s11783-016-0846-x

Abstract: Nitrogen-cycling microbial communities in municipal WWTPs were characterized.Diversity of whole nitrogen-cycling communities was analyzed with DNA microarray.CAS process retained diverse nitrogen cycling populations.This study characterized the quantity and diversity of nitrogen cycling genes in various processes ofResults of this study suggest that CAS maintains a diverse community of nitrogen cycling microorganisms

Keywords： DNA microarray analysis     Nitrogen cycling functional genes     Most probable number-polymerase chain reaction    

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Overlooked nitrogen-cycling microorganisms in biological wastewater treatment

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1426-2

Abstract:

• AOA and comammox bacteria can be more abundant and active than AOB/NOB at WWTPs.

Keywords： Ammonia oxidizing archaea (AOA)     Complete ammonia oxidizing (comammox) bacteria     Dissimilatory nitrate reduction to ammonium (DNRA) bacteria     Nitrate/nitrite-dependent anaerobic methane oxidizing (NOx-DAMO) microorganisms     Engineering application    

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Title Author Date Type Operation

emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete under freeze–thawcycling

Journal Article

Experimental investigation on freeze−thaw durability of polymer concrete

Journal Article

Stress-strain relationship of concrete in freeze-thaw environment

ZOU Chaoying, ZHAO Juan, LIANG Feng

Journal Article

Influence of freeze–thaw damage gradient on stress–strain relationship of stressed concrete

Journal Article

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

Shuaicheng GUO, Qingli DAI, Jacob HILLER

Journal Article

Influence of construction-induced damage on the degradation of freeze–thawed lightweight cellular concrete

Journal Article

MANURE AND METROPOLES---A GLOBAL FRAMEWORK FOR NUTRIENT CYCLING IN FOOD SYSTEMS

Journal Article

Biosorption of Cr(III) from aqueous solution by freeze-dried activated sludge: Equilibrium, kinetic and

Qian YAO, Hua ZHANG, Jun WU, Liming SHAO, Pinjing HE,

Journal Article

SOIL NITROGEN CYCLING AND ENVIRONMENTAL IMPACTS IN THE SUBTROPICAL HILLY REGION OF CHINA: EVIDENCE FROM

Journal Article

Elastic modulus and thermal stress in coating during heat cycling with different substrate shapes

Daniel GAONA,Alfredo VALAREZO

Journal Article

MANURE AND METROPOLES—A GLOBAL FRAMEWORK FOR NUTRIENT CYCLING IN FOOD SYSTEMS

Daan VERSTAND, Theun VELLINGA, Krijn POPPE, Pieter de WOLF

Journal Article

Intracellular trehalose improves the survival of human red blood cells by freeze-drying

HE Hui, LIU Baolin, HUA Zezhao, LI Chuan, WU Zhengzheng

Journal Article

biomass-derived carbon loaded with MnO as lithium-ion battery anode for improving its reversible capacity and cycling

Journal Article

Characterization of the genes involved in nitrogen cycling in wastewater treatment plants using DNA microarray

Junqin PANG, Masami MATSUDA, Masashi KURODA, Daisuke INOUE, Kazunari SEI, Kei NISHIDA, Michihiko IKE

Journal Article

Overlooked nitrogen-cycling microorganisms in biological wastewater treatment

Journal Article