In the present worksheet is shown a procedure to obtain the relations for the sides and angles of a hyperbolic polygon, no matter its number of sides. The study consists of two parts, the first for polygons in general and the second for right-angled polygons in particular. The results can be applied, for instance, to the construction of hyperbolic polygons. For that, the required number of data is 2p-3, p being the number of the sides of the polygon.

The private equity firm J.F. Lehman & Co. on Monday said its portfolio company Trident Maritime Systems has sold its Hoffman Engineering company to another investment firm, Branford Castle Partners. […]

The State Department approved a potential Foreign Military Sale of $4.92 billion in Boeing [BA] E-7 Wedgetail Airborne Early Warning and Control Aircraft to South Korea. The Defense Security Cooperation […]

The U.S. government recently released four rulemakings on space export control designed to strengthen private sector space activity and improve international collaboration. The Department of Commerce and Department of State released four space export control […]

The U.S. Space Force said on Wednesday that it has added five companies to the U.S. Space Command Combined Space Operations Center’s (CSpOC) Commercial Integration Cell (CIC) at Vandenberg Space […]

As NATO countries assess how a second Trump administration will approach alliance priorities, analysts on Thursday said the president-elect could look to push increasing the burden sharing requirement to have […]

A second Trump administration committed to cutting federal spending could mean very good things for non-traditional defense companies and startups because of a focus on affordability, Eric DeMarco, the president […]

A pair of companies with experience dismantling maritime vessels and nuclear facilities, respectively, are teaming up to compete on the dismantlement of decommissioned U.S. Navy aircraft carrier, starting with the […]

Firefly Aerospace has raised $175 million in new venture capital that will help it boost production of a multi-mission orbital vehicle and its small lift rocket, and accelerate hardware qualification […]

President-elect Donald Trump has selected Rep. Mike Waltz (R-Fla.), a member of the House Armed Services Committee, to serve as national security adviser in his next administration. Waltz, a former […]

Nagoya and Gifu JALT (Nagoya and Gifu Chapter of the Japan Association for Language Teaching). December 7 (Sat), 18:30-19:45 in Nagoya, Aichi. All Attendees.

JALT (The Annual International Conference of the Japan Association for Language Teaching). November 15 (Fri), 13:30-19:00 in Shizuoka. Call for proposals ends March 10th, 2024.

The tenth in our series on the lower limb is on Developmental Internal Rotation - Femoral and Obturator Nerves.
See our website for accompanying diagrams

The tenth in our series on the thorax describes the Respiratory Movements and the Diaphragm.
See our website for accompanying diagrams

The ninth in our series is on the Kidneys, ureters and bladder.
See our website for accompanying diagrams

The ninth in our series on the lower limb is on the Principles of Movement at Joints in the Lower Limb.
See our website for accompanying diagrams

Bacharach Inc., a manufacturer of refrigerant gas detection and combustion analyzers, is implementing an enhanced 24 hour priority calibration and repair service option out of their New Kensington, Pennsylvania, location to build upon the company’s current service support capabilities.

The Women in Energy Association launched a new website: wewomeninenergy.com. The website supports the group’s mission to connect and empower women working in the energy industry. They do this by providing career resources, creating networking and mentoring opportunities, promoting educational courses, and developing strategies to minimize obstacles women may face in the industry.

Renovate America has launched an online marketplace that gives homeowners a one-stop shop for browsing helpful renovation project advice, finding and selecting highly rated, quality-tested contractors, and comparing multiple financing options. With Harvard University’s Joint Center for Housing Studies expecting healthy growth in homeowner spending on remodeling through 2025, and with sustainability and energy-efficient upgrades among the fastest-growing market segments, the marketplace at the revamped renovateamerica.com is positioned to capitalize on key trends in home improvement.

Heatcraft Worldwide Refrigeration announced the launch of THE HUB, the company’s latest eTool platform that will enable users to gain faster access to the tools, information, and products needed to quickly service customers' needs.

The major drivers of future-proofed HVAC systems are efficiency, resiliency, electrification, and grid-interactivity.

ESG funds are experiencing a record year, as more investors, such as pensions fund managers, are making it a top priority when deciding where to put their money.

Trane has been named Green Builder Media’s prestigious HVAC Brand Leader for 2022 and was recognized for its sustainable solutions and focus on efficient indoor comfort.

On Earth Day 2022, more homeowners appear to be thinking globally and acting locally when it comes to home energy consumption, much of which is claimed by HVAC systems.

There are a wide variety of products that help consumers align their concerns for the environment with their desire for comfort.

The IRA provides incentives to homeowners looking to replace old equipment that burns fossil fuels with new high-efficiency systems that is powered by renewable energy, and HVAC contractors are needed to install it.

Homeowners looking to add solar, EV chargers, high-efficiency heat pumps, and more will soon have access to numerous tax incentives and rebates. HVAC contractors may want to consider offering more of these products and services.

The DOE aims to build upon current Enhanced Geothermal Shots by accelerating research, development, and demonstrations within enhanced geothermal systems, to tap into and better understand resources while significantly reducing the cost of EGS.

Thomas Yoon, president and CEO, LG North America CEO, addresses barriers to market growth at a recent White House executive roundtable. 

Danfoss North America recently signed a power purchase agreement with CIG Capital, a U.S.-based project financing firm, to purchase about 75 MW of solar power from a solar farm in Texas, starting in 2025.

Joshua Kelly will help guide SmartAC.com’s efforts as the company continues to innovate its Smart Agreements and connected home systems technology, a press release from SmartAC.com said.

Members of the Women in HVACR board work with the executive team to guide the organization’s direction, oversee financial management, and ensure legal and ethical integrity.

Colorado’s total allocation for both Home Energy Rebates programs is more than $70 million.

Dr. Spangler brings invaluable expertise to advance HVAC Excellence's mission of helping HVACR educational programs meet industry-established standards through programmatic accreditation.

Jason Cocco, formerly the president and chief revenue officer at BFC Solutions, succeeded Phil Whitaker as CEO last month.

The SunSource® Commercial Energy System is the only commercial HVAC system to integrate directly with solar power by collecting free, clean energy from the sun and sending it directly to Lennox’ Energence® rooftop unit.

Based on scientific discoveries at Kano Laboratories, Kroil creeps into millionth inch spaces, dissolves rust and lubricates to loosen frozen metal parts. Kroil’s unique molecular structure creates an affinity to metal assuring swift penetration.

With instant access to over 4,000 light commercial RTU’s, the Allied Crossover App quickly identifies the best Allied Commercial™ matchup for your equipment replacement needs.

Midea America Corp. has introduced the Premier Series, a completely refined inverter ductless system technology. While the majority of these provide 100% heating output at 5°F ambient temperatures, most offer 100% of the stated cooling capacity at -4°F, with a few attaining 100% cooling at -22°F.

We guarantee we’ll save GreenStar Alliance members thousands on equipment costs. We are also here to help streamline your business, taking care of documentation and shipping for you as well! Learn more by calling 888-249-HVAC, or go to www.GreenStarAlliance.com!

California HVAC contractor JBS Heating and Air Conditioning has been named a recipient of the Bryant Medal of Excellence Award for the second consecutive year. The honor is awarded by Bryant Heating and Cooling Systems to local heating and air conditioning contractors that meet their high standards for customer satisfaction.

An additional $500,000 in funding is available this winter for low-income Coloradans who can't afford to repair their non-working home heating system, according to Energy Outreach Colorado (EOC).

SolarCity is introducing a Smart Energy Home offering to new residential customers in Hawaii. It includes advanced technology: solar photovoltaic (PV), battery storage, smart electric water heaters, and the Nest Learning Thermostat, all coordinated by a home gateway.

Cooper Oates Air Conditioning (COAC), a mechanical contractor serving northern California, has announced the appointment of James Biagioni as general manager, Service Division. Biagioni will be responsible for all operational aspects of the Service Division.

Mauzy Heating, Air & Solar, a provider of heating and cooling as well as solar energy services in Southern California, has announced the appointment of Jim Richardson as the company’s new general manager.

Harris Companies, a leading national mechanical contractor, announced it has purchased Quality Mechanical Contractors based in Las Vegas. Founded in 1971, Quality Mechanical specializes in industrial, commercial, and residential HVAC, plumbing, piping, and sheet metal fabrication.

Slideshow: The National Air Duct Cleaning Association annual meeting in New Orleans at the end of March delved deep into the cleaning business with a focus on keeping up the demand momentum for the service from COVID-19.

These simple guidelines will help HVAC contractors shift their business from “practitioner” to “specialist.”

It’s easy to forget that what is a regular day on the job for you is a significant event in the life of your customer.

There are varying types of symptoms that can occur when a refrigeration system has an overcharge of refrigerant.