Heavy ion fusion is a type of nuclear fusion that involves the use of heavy ions—atomic nuclei that are relatively large and carry a positive charge—to induce fusion reactions in other nuclei. This approach is often studied in the context of achieving controlled nuclear fusion for energy production or for basic research in nuclear physics.

A heavy snow warning is a weather alert issued by meteorological agencies to indicate that significant snowfall is expected over a specific area within a certain timeframe. This warning typically means that accumulations of a certain amount of snow (often defined by local criteria) are anticipated, which could lead to hazardous conditions such as difficult travel, reduced visibility, and potential impacts on infrastructure and services. The criteria for what constitutes a heavy snow warning can vary by region due to differences in climate and typical weather patterns.

Here are the heights of several U.S. Presidents and notable presidential candidates: 1. **George Washington**: 6'2" 2. **Thomas Jefferson**: 6'2" 3. **Abraham Lincoln**: 6'4" 4. **Theodore Roosevelt**: 5'10" 5. **William Howard Taft**: 5'11" 6. **Franklin D. Roosevelt**: 6'2" 7. **John F.

Heinrich Wilhelm Brandes (1890–1979) was a German chemist known for his contributions to various fields of chemistry during the 20th century. He made significant advancements in the study of synthetic substances, particularly in the context of polymer chemistry. Brandes's research focused on the development and application of new materials, which had implications in multiple industries, including plastics and manufacturing.

A Helium-Neon (He-Ne) laser is a type of gas laser that utilizes a mixture of helium and neon gases to produce coherent light. It was one of the earliest types of lasers developed and is widely used in various applications due to its relatively simple design and stability. ### Key Characteristics: 1. **Working Principle**: The laser operates on the principle of stimulated emission. In a helium-neon laser, an electrical discharge excites helium atoms in the gas mixture.

Heljan is a manufacturer of model trains and related products, headquartered in Denmark. Founded in 1958, the company specializes in model railway items, particularly in the scales of HO (1:87) and O (1:43.5) gauge. Heljan is known for producing high-quality models of locomotives, rolling stock, and various accessories, often focusing on prototypes from British, Danish, and other European railways.

"Hellraisers Ball: Caught in the Act" is a film that blends elements of the horror and comedy genres. It features a storyline centered around a group of partygoers at a wild event called the Hellraisers Ball. The film typically incorporates campy humor, supernatural elements, and over-the-top scenarios, showcasing characters that navigate the chaos and terror of the night.

Henry Roy Brahana, commonly known as H.R. Brahana, was an American geologist notable for his contributions to the field of geology, particularly in the study of sedimentology and stratigraphy. He is best known for his work related to sedimentary processes and the interpretation of sedimentary rocks. His research has been influential in understanding geological formations and the history of the Earth.

Hideo Ohno is a prominent Japanese physicist known for his work in the field of semiconductor physics and spintronics. He has made significant contributions to the understanding of magnetic semiconductors and their applications in spintronic devices, which leverage both the charge and spin of electrons for improved functionality in electronics. His research may involve developing new materials and exploring the fundamental properties of these systems for future technological advancements.

The Herchel Smith Professor of Pure Mathematics is a prestigious academic position associated with the University of Cambridge. This chair is named after Herchel Smith, a notable benefactor and philanthropist who made significant contributions to the field of mathematics and education. The position is typically held by a distinguished mathematician who specializes in pure mathematics, which encompasses areas such as algebra, analysis, geometry, and topology, among others.

A Hermitian symmetric space is a type of Riemannian manifold that possesses a certain symmetric structure along with a compatible complex structure. More specifically, a Hermitian symmetric space is defined as a homogeneous space \( G/K \) where: 1. **Complex Structure**: The space has a complex manifold structure, meaning it can be described using complex coordinates, and it possesses a compatible Hermitian metric \( g \).

A Hessenberg matrix is a special kind of square matrix that has zero entries below the first subdiagonal.

Higher spin alternating sign matrices (ASMs) are a generalization of the classical alternating sign matrices, which are combinatorial objects studied in combinatorics and statistical mechanics.

High-resolution melting (HRM) analysis is a molecular technique used to analyze and quantify variations in DNA sequences. It leverages the principles of DNA melting and fluorescence to provide real-time insight into the melting behavior of DNA amplicons (PCR products) as they are gradually heated. Here’s a brief overview of how it works and its applications: ### Principles of HRM: 1. **DNA Melting**: DNA strands are held together by hydrogen bonds between complementary bases.

Hisashi Terao is a Japanese actor known for his work in film, television, and theater. Born on June 3, 1950, he has appeared in a variety of roles, showcasing his versatility across different genres. Terao is particularly recognized for his performances in both period dramas and contemporary pieces. He has had a significant impact on Japanese cinema and theater over the years and has built a reputation for his talent and dedication to his craft.

Historic preservation of transport refers to the efforts and practices aimed at conserving and maintaining transportation-related structures, vehicles, and systems that hold historical, cultural, or architectural significance. This can encompass a wide range of elements, including: 1. **Roads and Highways**: Preservation of historic roadways that may have played crucial roles in transportation history, such as routes from the 19th century or early highways.

The history of marine biology is a rich and evolving tale that reflects humanity's growing understanding of the ocean and its ecosystems. Here’s an overview broken down into significant periods: ### Ancient Times - **Early Civilizations:** Ancient cultures, such as the Greeks and Romans, had a basic understanding of marine life, largely driven by fishing and mythology. Aristotle (384-322 BC) is often considered one of the first marine biologists; he made observations of marine organisms and classified them.

The Hindu-Arabic numeral system, the most widely used numeral system today, has a rich history that spans several cultures and centuries. Here’s a brief overview of its development: ### 1. Origins in India - **Indian Numerals (circa 6th century CE)**: The numeral system originated in India, where it was developed by Indian mathematicians.

The history of the jet engine is a fascinating tale of innovation and technological development that has transformed aviation and powered a range of military and civilian aircraft. Here’s an overview of key milestones in the history of jet propulsion: ### Early Concepts - **Ancient Times**: The principles of jet propulsion can be traced back to ancient China, where devices like the "hot air balloon" were developed, and the use of steam and gunpowder laid the groundwork for later technologies.

Hitoshi Motoshima is a Japanese politician, known for serving as the mayor of Nagasaki. He gained notoriety for his outspoken views on nuclear weapons and peace, particularly in relation to the atomic bombings of Hiroshima and Nagasaki during World War II. As mayor, he emphasized the importance of nuclear disarmament and the promotion of peace, often representing Nagasaki's historical significance as a city affected by such tragedies.