نتایج جستجو برای: freeze thaw cycles
تعداد نتایج: 107248 فیلتر نتایج به سال:
Portland cement pervious concrete (PCPC) is increasingly being used in the United States in sidewalks and parking lots due to its benefits in reducing the amount of runoff water and improving water quality. In the United States, PCPC typically has high porosity and low strength, which has resulted in limited use of pervious concrete in hard wet freeze environments (i.e., the Midwest and Northea...
Freeze–thaw damage is one of the primary causes deteriorating seismic resistance reinforced concrete (RC) structures. This paper proposed a freeze–thaw deterioration model for C30 concrete, and it can be employed to study time-varying performance aging RC columns. Next, this developed fragility analysis framework columns considering effect damage. Considering geometric parameters case-study bri...
Advances in the "omics" field bring about the need for a high number of good quality samples. Many omics studies take advantage of biobanked samples to meet this need. Most of the laboratory errors occur in the pre-analytical phase. Therefore evidence-based standard operating procedures for the pre-analytical phase as well as markers to distinguish between 'good' and 'bad' quality samples takin...
Past discussions of the relative strengths of nested case-control and case-cohort designs have not fully considered cohorts with stored biological samples in which biomarker analyses are planned. Issues related to biomarker analyses can affect an investigator's choice of design and the conduct of these two designs. The key issues identified are effects of analytic batch, long-term storage, and ...
BACKGROUND Reduced cerebrospinal fluid (CSF) concentration of amyloid-β1-42 (Aβ1-42) reflects the presence of amyloidopathy in brains of subjects with Alzheimer's disease (AD). OBJECTIVE To qualify the use of Aβ1-42/Aβ1-40 for improvement of standard operating procedures (SOP) for measurement of CSF Aβ with a focus on CSF collection, storage, and analysis. METHODS Euroimmun ELISAs for CSF A...
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-...
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