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Hot Weather Concreting

Hot Weather Concreting

Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...

Adaptations that Reduce Water Loss

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

Masonry in Cold and Hot Weather Conditions

Masonry in Cold and Hot Weather Conditions

In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...

Increased Body Temperature

Increased Body Temperature

A body temperature above 38°C (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...

Global Climate Change

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.

Design Example: Managing Concrete Workability

Design Example: Managing Concrete Workability

This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.

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A Hot Summer Brings More ACA Litigation.

¹Katie Keith (katie.keith@georgetown.edu) is a principal at Keith Policy Solutions, LLC, an appointed consumer representative to the National Association of Insurance Commissioners, and an adjunct professor at the Georgetown University Law Center. She is also a Health Affairs contributing editor. [Published online September 14, 2020.] Readers can find more detail and updates on health reform on Health Affairs Blog (http://healthaffairs.org/blog/), where Keith publishes rapid-response "Following The ACA" posts.

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Summary

The Supreme Court will review the constitutionality of the Affordable Care Act. New court decisions impact the future of this landmark healthcare law.

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Area of Science:

Health Law
Public Policy
Supreme Court Litigation

Background:

The Affordable Care Act (ACA) remains a significant piece of legislation impacting health insurance in the United States.
Ongoing legal challenges question the ACA's validity and future.
The Supreme Court's involvement signifies a critical juncture for healthcare policy.

Purpose of the Study:

To analyze the implications of the Supreme Court hearing California v. Texas.
To examine recent court decisions concerning the Affordable Care Act.
To understand the potential impact on healthcare access and insurance coverage.

Main Methods:

Review of legal filings and arguments in California v. Texas.
Analysis of recent judicial rulings on the ACA.
Monitoring of legislative and policy responses.

Main Results:

The Supreme Court has agreed to hear the case of California v. Texas, challenging the ACA's constitutionality.
Lower courts have issued varying decisions regarding the ACA, creating legal uncertainty.
The outcome of these legal battles could reshape the healthcare landscape.

Conclusions:

The upcoming Supreme Court case represents a major threat to the Affordable Care Act.
Recent judicial activity underscores the ongoing legal instability surrounding the ACA.
The future of healthcare policy in the US is contingent on these legal proceedings.