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Magnetic Declination

Magnetic Declination

Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...

Azimuths and Bearings

Azimuths and Bearings

Azimuths and bearings are essential concepts in surveying, providing methods to express the direction of a line relative to a meridian. Azimuths refer to the clockwise angle measured from the north end of a reference meridian to the given line, ranging from zero to 360 degrees. This method gives a comprehensive directional reference within a full 360-degree circle, making it a straightforward way to communicate direction in various fields, including navigation, cartography, and...

Polar Coordinates

Polar Coordinates

The polar coordinate system offers an alternative to the Cartesian coordinate system for specifying points in a plane, using a distance and an angle instead of x and y coordinates. This system is particularly advantageous in situations involving circular or rotational symmetry, such as in physics or engineering problems involving waves, oscillations, or orbital paths.Defining Polar CoordinatesIn polar coordinates, a point is represented as P(r, ��), where r is the radial distance...

Magnetism

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...

Compass

Compass

The compass is a fundamental instrument that operates by aligning its magnetic needle with Earth's magnetic field. This alignment facilitates navigation and orientation, offering a means to determine direction relative to magnetic north. However, the magnetic needle points to magnetic north, which differs slightly from true geographic north due to magnetic declination, which is the angular deviation between these two points. Declination varies based on geographic location and shifts over time...

Diamagnetism

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....

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Related Experiment Video

Updated: Jan 8, 2026

The NeuroStar TMS Device: Conducting the FDA Approved Protocol for Treatment of Depression

The NeuroStar TMS Device: Conducting the FDA Approved Protocol for Treatment of Depression

Published on: November 12, 2010

North Star.

Manuela Spadea¹

¹Department of Pediatric Hematology-Oncology, Stem Cell Transplantation and Cell Therapy, Regina Margherita Children's Hospital, University of Turin, Turin, Italy.

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology

|December 15, 2025

Summary

This pediatric oncology reflection emphasizes the profound impact of physician presence. It highlights that compassionate care, beyond medical protocols, is essential for healing children with cancer.

Area of Science:

Pediatric Oncology
Medical Ethics
Palliative Care

Background:

The practice of pediatric oncology often focuses on treatment protocols and survival rates.
The emotional and psychological well-being of children with cancer and their families is a critical aspect of care.
The role of the physician's presence and human connection in healing is increasingly recognized.

Purpose of the Study:

To explore the significance of physician presence in pediatric oncology.
To underscore the importance of compassionate care beyond clinical outcomes.
To reflect on the humanistic aspects of treating childhood cancer.

Main Methods:

This work is a reflective essay based on the author's experiences as a pediatric oncologist.
It draws upon clinical observations and personal insights.

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The narrative approach is used to convey the core message.

Main Results:

The presence of the pediatric oncologist offers a unique form of medicine that complements standard treatments.
Human connection and empathy are vital components in the healing process for pediatric cancer patients.
Focusing solely on protocols and outcomes can overlook the essential human element of care.

Conclusions:

The deepest form of medicine in pediatric oncology involves genuine human presence and connection.
Embracing presence can enhance the therapeutic relationship and improve the patient experience.
Integrating compassionate presence into practice is crucial for holistic pediatric cancer care.