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 physical effect known as stepwise precession is a surprising fact that takes place in the movement of an elastic pendulum. When this pendulum is initially set near the downward equilibrium vertical configuration, with the length of the spring stretched by the gravity force, there is a chance to move in such a way that the springing vibrational mode of movement and the rotational "swing" mode interchange periodically their respective energies, with a periodic change of the swing plane and stepwise precession. We simulate here numerically the same dynamical behaviour for the natural extension of a double elastic-spherical pendulum.

The Global Positioning System (GPS) program, established in 1973, needs to launch four Lockheed Martin [LMT] GPS III satellites with the L5 signal in short order to help counter adversary […]

BWX Technologies [BWXT] has agreed to acquire a specialty materials and manufacturing business from L3Harris Technologies ’ [LHX] Aerojet Rocketdyne segment for $100 million. The Aerojet Ordnance Tennessee, Inc. (AOT) […]

Palantir Technologies [PLTR] on Monday reported surging sales in its third quarter that included strong revenue from Defense Department contracts and the U.S. government overall. Sales to the DoD were […]

In the wake of Donald Trump securing his second term as president, the GOP on election day also regained majority in the Senate with new leaders set to take over […]

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 […]

President-elect Donald Trump announced on Tuesday evening he has selected Fox News host Pete Hegseth to serve as his defense secretary. Hegseth, an Army veteran, is a surprise pick that […]

NanKyu JALT (NanKyu Chapter of the Japan Association for Language Teaching). January 25 (Sat), 9:00-18:00 in Kumamoto. Edward Rubesch.

Kobe JALT (Kobe Chapter of the Japan Association for Language Teaching). December 8 (Sun), 14:00-15:30 in Kobe, Hyogo. Stephen McNamara (Kwansei Gakuin University).

NanKyu JALT (NanKyu Chapter of the Japan Association for Language Teaching). January 25 (Sat) 2025, at SILC Building, Sojo University, Kumamoto.

Greenbuild 2023 will celebrate the U.S. Green Building Council’s 30th anniversary and newest version of LEED.

Initially, Arizona’s Efficiency Arizona program, in partnership with community action agencies, will focus on providing heat pumps through an a/c replacement program that addresses heat-relief emergencies and/or financial hardships.

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

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.

Shurtape® DC 181 film tape is designed to prevent air loss when connecting, joining, sealing and patching flexible air ductwork — even in cold temperatures. 

The unique valve design of V-traps makes them virtually trouble free. They are self-priming; you never have to add water to make them work. A self-sealing column of water, equal in height to the negative pressure in the air conditioner, automatically prevents air from entering the drain trap allowing the condensate to drain freely.

Just like the online retail giant solved its verification problems with snapshots of delivered packages, the HVAC industry must prove its product — comfort — is being delivered to the customer.

Though it is time-intensive, regular evaluations drive growth by improving clarity, job satisfaction, and performance, while fostering continuous dialogue that aligns individual goals with organizational success.

A new generation is discovering that a four-year degree isn’t necessary to be successful.

As a heating and air conditioning company owner; where do I get leads from today? Where do I put my money today?

The Bill Howe Family of Companies announced it has earned the 2015 Angie’s List Super Service Award in six categories. The service company provides heating, air conditioning, restoration and flood remediation, and plumbing services in the San Diego area.

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.

A&B Properties Inc. (ABP), a wholly owned subsidiary of Alexander & Baldwin Inc., has partnered with Carbon Lighthouse, an energy services company, to implement a two-month pilot to identify energy efficiency initiatives for its commercial assets in Hawaii.

Leaders from five service contracting companies from the plumbing, heating and cooling, and electrical industry joined contributing NEWS columnist Al Levi at the JW Marriott Desert Ridge in Phoenix on November 15-16, 2017 for The 7-Power Contractor® Build Your Operating Manuals Program Workshop.

The Contractors Association of Kauai (CAK is offering multiple scholarships to Kauai residents seeking a career in a construction-related field of study.

A question I’m frequently asked is, where do you start when improving a poorly performing duct system? Do you tear it out and start over again, or is there an easier way? The good news is, there is a simple, logical pattern you can follow to optimize a duct system.

Paying attention to these 10 factors will ensure that customers get the highest possible comfort and efficiency.

This article will explore the remote bulb and its proper placement on a system’s suction line.

The 250,000-square-foot facility — customized for broad training purposes, administration, and manufacturing — joins several other Watts Works Learning Centers across North America.

Manufacturers are designing a new generation of heat exchangers with more advantages over present designs.

The legal cannabis market continues to represent the dot-com era. Plenty of opportunity remains.

Building operators want people back, and they’re investing in IAQ upgrades to help ease occupant concerns.

The coronavirus pandemic increased consumer awareness of IAQ to its highest level. The question now is, will this elevated interest in IAQ continue after the pandemic ends?

As wildfires become more common, can future Tesla home HVAC system users expect the same sort of defense against poor air quality that its vehicles have?

Darren Gibula is familiar with LG, the company said, having spent nearly six years with the company in the Air Conditioning Technologies division in operations and customer experience roles.

The survey explored homeowners’ attitudes toward the Inflation Reduction Act and home upgrades, specifically heat pumps, that increase sustainability.

Terravis executes detailed tests that monitor the heat pump's performance across 12 ambient temperature points, from 14°F to -31°F.

IAQ-conscious homeowners might be interested to know how humidification can preserve not only their health but the health of their home, too.

The System 1738 PVC Product Line is a flue gas venting plumbing and mechanical solution certified to the stringent UL 1738 standard, a development for gas-fired water heaters, furnaces, and boilers. 

Private equity funds managed by Blackstone Private Equity will purchase Emerson’s 40% common equity ownership in the joint venture, while Copeland will repurchase the seller’s note.

The Daikin Seattle Experience Center is equipped with cutting-edge technology and interactive exhibits that provide a hands-on learning experience for all ages, the company said in a press release.

ACCA's annual awards recognize outstanding achievements in the HVACR industry, and the program is widely recognized as a celebration of the best of the best.

The Ridgid Experience, the brand’s signature event, gives select trades workers an all-expenses-paid, three-day trip that features hands-on factory experiences, fun, and camaraderie, a press release from Ridgid said.

James Piccione founded Aspen Manufacturing in 1975, and the company is now one of the largest independent manufacturers of evaporator coils and air handlers for the residential and light commercial HVAC markets in the U.S. and Canada.

The Markham District Energy facility differs from standard applications because instead of relying on conventional energy sources, it captures waste heat from sewage, which enters at about 5°C and is converted into 95°C usable heat.

As one of the larger contributors to a facility’s expenses, it is critical to incorporate preventative measures into regular maintenance and cleaning plans for boilers.

ABMA's Boiler 2024 is scheduled for May 1-3, 2024, at the Gaylord Rockies Resort & Convention Center in Aurora, Colorado, just outside Denver.

The DCC boiler eliminates greenhouse gas emissions, providing a clean and eco-friendly source of steam for various industries and applications, Jericho Energy Ventures said.

In this month’s troubleshooting situation, you are responding to a restaurant manager’s call for service, and the equipment is a walk-in freezer.