Although biochar has been investigated extensively to stabilize soil heavy metals, there were limited investigation on the stabilization of metals by using under natural ageing processes alternate-cooling/heating. In this study, wheat-straw-biochar-treated samples contaminated with Pb(II) ions/PbO subjected 12 h-freeze/12 h-thaw cycles simulating alternate-cooling/heating process. After freeze-...

The stability of riverbanks in cold regions is affected by the freeze-thaw action. process causes changes moisture content, friction angle, and cohesiveness bank material. Together with effect, seepage pressure influenced changing water levels, slope are key factors affecting stability. A limit equilibrium model considering infiltration effect developed applied to Shisifenzi section Inner Mongo...

OBJECTIVES To assess the reliability of intradiscal pressure measurement during in vitro biomechanical testing. In particular, the variability of measurements will be assessed for repeated measures by considering the effect of specimens and of freezing/thawing cycles. METHODS Thirty-six functional units from 8 porcine spines (S1: T7-T8, S2: T9-T10, S3: T12-T11, S4: T14-T13, S5: L1-L2 and S6: ...

In the construction project, rock mass is often destroyed from joint plane, and jointed easy to be eroded by freeze-thaw environment. Therefore, damage mechanical properties of filled under action are very important for disaster prevention, engineering safety evaluation reinforcement. order research effect cycle on deterioration characteristics rocks, prefabricated samples tested with different...

The objective of the present study was to investigate the effects of the direct addition of pentoxifylline (PF) to the ejaculates of men with poor sperm quality before freezing on post-thaw sperm motility, viability, acrosome integrity, and agonist-induced acrosome reaction. Semen specimens from 16 infertile men with impaired sperm count and motility (oligoasthenozoospermia) were divided into t...

Liquid nitrogen (LN 2 ) fracturing technology as a kind of waterless has received extensive attention in recent years. In order to investigate the evolution law fissure structure and seepage characteristics coal samples under LN freezing freeze–thaw, before after freeze–thaw was monitored by micro-computed tomography, change permeability different time cycles measured, damage mechanism discusse...

The wide distribution of alpine saline areas in China is faced with two major problems, which are salt intrusion and freeze–thaw. In total, 216 specimens were prepared 6 kinds concrete mix proportions this paper. effects the single compound incorporation metakaolin (MK) polypropylene fiber (PPF) different amounts on mechanical properties microstructure investigated under dual action multi-salt ...

The relative effect of a freeze-thaw cycle on photosynthesis, respiration, and ion leakage of potato leaf tissue was examined in two potato species, Solanum acaule Bitt. and Solanum commersonii Dun. Photosynthesis was found to be much more sensitive to freezing stress than was respiration, and demonstrated more than a 60% inhibition before any impairment of respiratory function was observed. Ph...