The Comparation of Arrhenius-Type and Modified Johnson-Cook Constitutive Models at Elevated Temperature for Annealed TA31 Titanium Alloy.

Constitutive models play a significant role in understanding the deformation behavior of materials and in optimizing the manufacturing process. In order to improve the reliability of calculation results, the high temperature flow behavior of TA31 titanium alloy obtained from an annealed hot-rolled plate has been investigated by a Gleeble-3500 thermo-mechanical simulator. The isothermal hot compression tests are conducted in the temperature range of 850 to 1050 °C and the strain rate range from 0.

Cognitive therapeutic exercise in early proprioception recovery after knee osteoarthritis surgery.

Objective: This research aims to explore the therapeutic effect of cognitive therapeutic exercise (CTE) in proprioception recovery after knee osteoarthritis (KOA) surgery.

Methods: In total, thirty-seven patients recovering from KOA surgery (including 27 patients who had undergone high-tibial osteotomy (HTO) procedure and 10 patients who had received total knee arthroplasty (TKA) treatment were randomly assigned to two groups: 18 patients in the CTE group and 19 patients for the control group (non-CTE). Patients in the CTE group received proprioceptive training as cognitive therapy to facilitate proprioception recovery for up to 4 weeks: 5 days a week and two 10-min sessions a day.

Intermediate frequency electrotherapy stimulation to the medial femoris muscle for functional recovery of knee joint after anterior cruciate ligament reconstruction.

Objectives: To compare the effect of medial femoral muscle stimulation with medium frequency electrotherapy and conventional rehabilitation therapy on knee function recovery after anterior cruciate ligament (ACL) reconstruction.

Methods: Medical records of 50 patients with ACL reconstruction, treated in our hospital between July 2019 and December 2020, were retrospectively analyzed. Patients were divided into control group and study group (n=25, 18 males and 7 females in each group), based on the rehabilitation method used.

Characteristics of micro-nano bubbles and potential application in groundwater bioremediation.

Content of oxygen in water is a critical factor in increasing bioremediation efficiency for contaminated groundwater. Micro-nano bubbles (MNBs) injection seems to be an effective technique for increasing oxygen in water compared with traditional air sparging technology with macrobubbles. Micro-nano bubbles have larger interfacial area, higher inner pressure and density, and lower rising velocity in water, superior to that of macrobubbles.

Subsurface transport behavior of micro-nano bubbles and potential applications for groundwater remediation.

Micro-nano bubbles (MNBs) are tiny bubbles with diameters on the order of micrometers and nanometers, showing great potential in environmental remediation. However, the application is only in the beginning stages and remains to be intensively studied. In order to explore the possible use of MNBs in groundwater contaminant removal, this study focuses on the transport of MNBs in porous media and dissolution processes.

Approach for estimating microbial growth and biodegradation of hydrocarbon contaminants in subsoil based on field measurements: 2. Application in a field lysimeter experiment.

A new approach was applied to represent the natural attenuation of hydrocarbon (HC) contaminants as observed in a field lysimeter experiment. The approach describes the microbial growth on HC contaminants and linked HC biodegradation under natural precipitation conditions. The HC contaminants contained an inert component (n-dodecane) and soluble components (toluene, ethylbenzene, xylene isomers, and naphthalene), and their attenuation processes were predicted.

Approach for estimating microbial growth and the biodegradation of hydrocarbon contaminants in subsoil based on field measurements: 1. Model development and verification.

An approach was developed to represent the microbial growth and corresponding biodegradation of hydrocarbons (HCs) during the natural attenuation process based on field measurements of in situ microbial biomass and residual HC concentrations in unsaturated subsurface soil. A kinetic model combining Monod and logistic kinetics represents microbial growth under the limitation of HCs as substrates and environmental factors at actual contaminated sites by the introduction of two new kinetic parameters, the effective rate and the self-limiting coefficient of microbial growth. The correspondence between microbial growth and the biodegradation of HCs in the soil is obtained by dividing the amount of HC and the corresponding degrading microbial groups into two classes: saturated HCs as inert components and aromatic HCs that form a contamination plume as dissolved components.

Monitoring microbial community in a subsurface soil contaminated with hydrocarbons by quinone profile.

A natural attenuation experiment was carried out using a lysimeter for 308 days after contaminating the subsoil with hydrocarbons (HCs) and the changes in the structures of microbial community in the hydrocarbon (HC) contaminated subsoil were monitored by quinone profile analysis. The residues of HCs remained for 217 days in the subsoil after the contamination. The amount of total quinones (TQ), an indicator of microbial biomass, significantly increased in the HC contaminated subsoil for 217 days, comparing with that of the background subsoil or the subsoil before the addition of HCs.