Ultrasonic soldering is a specialized soldering technique that uses high-frequency ultrasonic waves to enhance the soldering process. This method employs ultrasonic vibrations, typically in the range of 20 kHz to 70 kHz, which are transmitted through a soldering tool or directly applied to the solder joint during the soldering process.

Ultrasonic vocalization refers to sounds produced by animals that are at frequencies higher than the upper limit of human hearing, typically above 20 kHz. Many animals, including certain mammals and some species of birds, use these high-frequency sounds for communication, navigation, and other purposes. In particular, ultrasonic vocalizations are well-studied in rodents, such as rats and mice, where they are often associated with social interactions, mating behaviors, and even distress signals.

Ultrasound-triggered drug delivery using stimuli-responsive hydrogels is an innovative approach in the field of controlled drug delivery systems. This technique involves the use of hydrogels that respond to external stimuli—in this case, ultrasound waves—for the controlled release of therapeutic agents. ### Key Components: 1. **Hydrogels**: These are three-dimensional polymer networks that can retain a significant amount of water while maintaining their structure.

A urinary tract ultrasound is a non-invasive imaging test that uses sound waves to create pictures of the organs and structures in the urinary tract. This includes the kidneys, ureters, bladder, and, in males, the prostate. The procedure is often performed to evaluate abnormalities, detect infections, assess kidney stones, observe changes related to urinary conditions, or guide further diagnostic procedures.

The velocity time integral (VTI) is a concept used in various fields, including fluid mechanics, structural dynamics, and signal processing. It refers to the integral of velocity over time, which essentially gives the total displacement (or change in position) of an object or fluid over a specific time interval.

Poinsot's ellipsoid is a geometric representation used in the study of rigid bodies in classical mechanics. It specifically describes the distribution of mass and the inertial properties of a rigid body. The concept is related to the inertia tensor of the body, which characterizes how the mass is distributed relative to its rotational axes. Poinsot's ellipsoid represents the relationships between the principal moments of inertia and the axes of rotation.

An oblique shock is a type of shock wave that occurs in supersonic flows when the flow encounters a ramp, wedge, or other surfaces that create a change in direction. Unlike normal shocks, which are perpendicular to the flow direction, oblique shocks are inclined at an angle relative to the flow direction.

The term "Petrovsky lacuna" refers to a specific problem in the field of functional analysis, particularly in the study of partial differential equations and the theory of distributions. It is associated with the work of the mathematician V. I. Petrovsky, who investigated the properties of certain classes of solutions to partial differential equations, especially those relating to the existence and behavior of weak solutions.

A vapor cone, also known as shock collar or vapor cloud, is a phenomenon that occurs when an aircraft, typically traveling at supersonic speeds (faster than the speed of sound), displaces air in such a way that moisture in the air condenses, creating a visible cloud. This effect is primarily seen around the aircraft's wings and fuselage due to the rapid changes in pressure and temperature as the aircraft breaks the sound barrier.

In anatomy, a "chiasm" refers to a crossing or intersection of nerve fibers, most commonly associated with the optic chiasm. The optic chiasm is a critical structure in the brain where the optic nerves from the eyes partially cross over.

A ligament is a type of connective tissue in the body that connects bones to other bones at joints. It is composed primarily of collagen fibers, which provide strength and stability while allowing for some flexibility. Ligaments play a crucial role in supporting and stabilizing joints, preventing excessive movements that could lead to injury. They are essential for maintaining the integrity of the skeletal system during activities that involve movement, bending, and weight-bearing.

Tenotomy is a surgical procedure that involves the cut or division of a tendon. This procedure is typically performed to relieve tension in the tendon, to correct deformities, or to improve the function of a joint. Tenotomies can be used in various medical contexts, particularly in orthopedic and sports medicine, to address conditions like tendonitis, contractures, or to facilitate a more effective range of motion in joints affected by tight or abnormal tendons.

The Beeswax Wreck is a notable shipwreck located off the coast of Cape Hatteras in North Carolina, USA. It is believed to be the remains of a 19th-century wooden sailing vessel that was transporting beeswax, a valuable commodity at the time, hence its name. The wreck is of interest to marine archaeologists and historians due to its potential to provide insights into maritime trade and shipping practices during that period.

Chinese wax, often referred to as "Chinese wax scale," is a natural product derived from the secretions of certain scale insects, specifically those belonging to the genus **Ceroplastes**. The wax is produced by these insects as a protective covering for themselves, and it appears as a white or yellowish substance.

Jojoba oil is a liquid extracted from the seeds of the jojoba plant (Simmondsia chinensis), which is native to southern Arizona, California, and northwestern Mexico. Unlike most plant oils, jojoba oil is actually a wax ester, closely resembling the natural oils produced by human skin, making it a popular ingredient in cosmetics and skincare products.

Mustache wax is a grooming product specifically designed to style and shape mustaches. It typically comes in a small tin or jar and is made from a blend of natural waxes, such as beeswax and lanolin, along with oils and sometimes fragrances. The primary purpose of mustache wax is to provide hold, allowing the user to mold the mustache into various styles—like curls, twists, or other shapes—while helping to tame unruly hairs.

Ouricury wax is a natural wax derived from the leaves and fruits of the Ouricury palm tree (Astrocaryum aculeatum), which is native to Brazil and other parts of South America. This wax is known for its unique properties, including its emollient, thickening, and stabilizing capabilities.

Renaissance Wax is a micro-crystalline wax used primarily for protecting and preserving a variety of surfaces, including metal, wood, leather, and stone. It is known for its ability to provide a thin, protective layer that helps prevent tarnishing, corrosion, and other forms of deterioration, while also enhancing the appearance of the surface it's applied to.

"Wax fire" often refers to a specific type of fire that can occur in environments where flammable wax is present, such as candle-making or candle-burning scenarios. It can also sometimes refer to incidents involving wax or waxy substances catching fire, primarily due to heat sources or improper handling. In a more general sense, wax is a combustible material, and if it reaches its flash point, it can ignite.

The "List of Nuclides" refers to a comprehensive catalog of all known isotopes (nuclides) of the chemical elements, including both stable and radioactive forms. Each nuclide is characterized by its atomic number (the number of protons), mass number (the total number of protons and neutrons), and sometimes its specific energy states and half-lives if it is radioactive.