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Related Concept Videos

Curing of Concrete01:20

Curing of Concrete

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The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
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Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
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Correlation means that there is a relationship between two or more variables (such as ice cream consumption and crime), but this relationship does not necessarily imply cause and effect. When two variables are correlated, it simply means that as one variable changes, so does the other. We can measure correlation by calculating a statistic known as a correlation coefficient. A correlation coefficient is a number from -1 to +1 that indicates the strength and direction of the relationship between...
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Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
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Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
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Subretinal Implantation of RPE on a Carrier in Minipigs: Guidelines for Preoperative Preparations, Surgical Techniques, and Postoperative Care
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Preoperative localization modalities in primary hyperparathyroidism: Correlation with postoperative cure.

Abbas Al-Kurd1, Barak Levit2, May Assaly1

  • 1Department of Surgery, Hadassah-Hebrew University Medical Center, Mount Scopus, Jerusalem, Israel.

Surgery
|April 28, 2018
PubMed
Summary
This summary is machine-generated.

Surgeon-performed ultrasonography is the most accurate preoperative imaging for parathyroid adenoma localization. Higher numbers of positive imaging studies correlate with increased cure rates in primary hyperparathyroidism surgery.

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Area of Science:

  • Endocrinology
  • Surgical Oncology
  • Radiology

Background:

  • Minimally invasive parathyroidectomy requires precise preoperative localization of parathyroid adenomas.
  • Accurate localization impacts surgical success and patient outcomes.

Purpose of the Study:

  • To evaluate the correlation between preoperative imaging, intraoperative findings, and postoperative cure rates in primary hyperparathyroidism.
  • To compare the efficacy of different preoperative imaging modalities for adenoma localization.

Main Methods:

  • Retrospective review of 398 patients who underwent parathyroidectomy for primary hyperparathyroidism between June 2010 and March 2016.
  • Analysis of preoperative imaging results (ultrasonography by surgeon and radiologist, sestamibi scan, CT) and correlation with surgical outcomes.

Main Results:

  • Surgeon-performed ultrasonography demonstrated superior adenoma lateralization (80%) compared to radiologist ultrasonography (62%) and sestamibi scan (70%).
  • Surgeon-performed ultrasonography had the highest sensitivity (93%) and accuracy (80%).
  • Higher numbers of positive preoperative imaging studies correlated with increased cure rates, from 80% to 100%.

Conclusions:

  • Experienced surgeon-performed ultrasonography is a highly valuable tool for preoperative localization.
  • The cure rate for primary hyperparathyroidism is proportional to the number of positive imaging studies.
  • Computed tomography does not significantly improve cure rates in cases with negative ultrasonography and sestamibi scans.