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un-ness-essary · 4 years

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Induction Machines Handbook: Steady State Modeling and Performance (3rd Edition) - eBook

Download it for: $11 only

Induction Machines Handbook: Steady State Modeling and Performance, 3rd Edition, (PDF) provides a comprehensive treatment of steady-state induction machines (IM), the generally used electric motor (generator) in somewhat constant or variable speed drives, always lower energy consumption and higher productivity in fundamentally all industries, from home appliances, through robotics to wind energy conversion and e-transport.

Chapter 1 provides a detailed introduction from basic principles to topological classifications and most important applications and power ranges from tens of W to tens of MW. Then separate Chapters 2 and 4 deal in detail with particular issues, like

Losses

Thermal modeling

Electric windings and their MMF

Starting and speed control methods

Skin and on-load saturation effects

Magnetization curve and inductance

Leakage inductances and resistances

Single-phase induction machine basic

Magnetic, electric, and insulation materials

Steady-state equivalent circuit and performance

Field harmonics, parasitic torques, radial forces, noise

Single-phase induction motors: steady-state modeling and performance

Fully updated and revised to reflect the last decade’s progress in the field, this third edition adds new sections, like

Closed-slot IM saturation

Equivalent circuits for BDFIM

Rotor leakage reactance saturation

Control principles for doubly-fed IM

PM-assisted split-phase cage-rotor IM’s steady-state

The brushless doubly-fed induction machine (BDFIM)

Multiphase and multilayer tooth-wound coil windings

The origin of electromagnetic vibration by practical experience

Magnetic saturation effects on current and torque versus slip curves

The promise of renewable (wind and hydro) energy through cage-rotor and doubly-fed variable speed generators e-transport propulsion and i-home appliances makes this edition a state-of-the-art tool, conceived with several case studies and timely for both academia and industry.

NOTE: The product only includes the ebook, Induction Machines Handbook: Steady State Modeling and Performance, 3e in PDF. No access codes are included.

https://duranbooks.net/shop/induction-machines-handbook-steady-state-modeling-and-performance-3rd-edition-ebook/

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csrgood · 4 years

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The Virus Crisis Affects Business in Many Way - What Will the Risks and Opportunities Result in Post-Emergency? BNP Paribas Offers Views…

The Virus Crisis Affects Business in Many Way -What Will Risks/Opportunities Result in Post-Emergency? BNP Paribas Offers Views

What might our world look like when the COVID-19 global emergency winds down and we move into the “recovery and restoration” phase? What is in store for business in the transition? And beyond? Looking at risk and opportunity through an ESG lens.

BNP Paribas Asset Management has offered up some important perspectives. ESG analyst Anupama Rames asks and answers: (1) Will the world go back to status quo when we exit the dis-location? (2) Probably not. “We believe,” she writes, “that the learnings from the go-remote experiment are here to stay.”

Last year BNP Paribas offered up the “3-E’s” – their methodology for addressing what the large asset management firm sees as the three key sustainability challenges of our time: (1) Energy transition; (2) Environmental sustainability; (3) Equality and inclusive growth. Now, analyst Rames is determining the risk, changes, risk mitigation strategies and opportunities in each of the categories.

The examples she cites:

Energy Transition There’s now a 20% drop in global oil consumption and negative regional oil pricing; the energy sector is under-performing equity and high-yield indices. Such factors as lower plastic uses (petro is a key component), electrification of transport and climate mitigation policies add up to dampened oil demand.

Changes in work patterns (more remote working, distancing), personal and business travel mean less oil demand today. Key concern going forward: stranded oil & gas assets over the long-term. Possible winners in the opportunity zone: renewables, conservation, energy storage (capturing the energy from the windmill).

And, BNP Paribas ESG integration methodology aims to differentiate winner and losers in the transition, post-emergency.

Environmental Sustainability Analyst Rames brings up a topic not really being discussed (yet) in broader discussion – the transmission path, from animal to human, such as with COVID-19, SARS, MERS, and other virus infections of recent years. Natural habitat destruction and global wildlife trade are factors. Vectors move in times of climate change and bring diseases with them!

Equality and Inclusive Growth The urban-rural divide (with many differentiations in the access to opportunities, access to the digital economy, mis-information overload, access to affordable healthcare) are key issues being confronted (and with varying results during the crisis).

The virus crisis is accelerating the transition to “remote” and digital connectivity in our personal and business lives. This can be positive – and quite negative in the socio-economic divide. A positive: on the opportunity side, remote healthcare can bring benefits to rural areas. The virus crisis day-by-day brings society closer to a “digitized” future. Analyst Anupama Rames sees this: Of all industries being re-shaped, healthcare will be most affected.

And an important note to corporate leaders: BNP Paribas is viewing transformations and market shifts through the lens of its 3E (ESG) framework, to identify public companies being proactive in finding solutions to the societal issues that can support “sustainable returns” for the long-term.

There are more details for you in the Top Story.

This is just the introduction of G&A's Sustainability Highlights newsletter this week. Click here to view the full issue.

source: https://www.csrwire.com/press_releases/44856-The-Virus-Crisis-Affects-Business-in-Many-Way-What-Will-the-Risks-and-Opportunities-Result-in-Post-Emergency-BNP-Paribas-Offers-Views-?tracking_source=rss

#CSR #corporate social responsibility #social good #philanthropy #employee engagement #workplace givi

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sciencespies · 5 years

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Sky Perfect JSAT, challenged by TV business, hedges bets on HAPS, 5G, HTS and smallsats

https://sciencespies.com/space/sky-perfect-jsat-challenged-by-tv-business-hedges-bets-on-haps-5g-hts-and-smallsats/

Sky Perfect JSAT, challenged by TV business, hedges bets on HAPS, 5G, HTS and smallsats

WASHINGTON — Japanese satellite operator Sky Perfect JSAT said it is focusing on a wide range of growth initiatives as fiber optic cable expansion and smartphone video viewing habits make its satellite broadcasting business increasingly difficult.

JSAT has lost more than half a million satellite television subscribers since 2013, when that business reached 3.83 million subscribers — the highest level in JSAT’s history.

In an annual report released Aug. 30, JSAT tallied 3.25 million subscribers for its SKY PerfecTV! satellite broadcasting business as of March 31, when its fiscal 2018 concluded.

JSAT said that while 4K and 8K Ultra-HD broadcasting presents an opportunity to grow revenue, competition from online streaming platforms is “escalating in intensity.” The operator said it sees a growing market in re-transmitting satellite television to fiber optic cable networks, but still expects its subscriber base to shrink in fiscal 2019 by 66,000.

JSAT reported 101.5 billion yen ($954.5 million) in 2018 revenue from its Media Business division, which accounts for 56.7% of overall revenues. Space Business revenues, which includes broadcast services for other customers, government connectivity, broadband, and other activities, counted for the remaining 43.3% at 73.4 billion yen.

JSAT said its total revenue for the year was 164 billion yen after subtracting “consolidated eliminations.”

Asia’s high-throughput potential

The Asia-Pacific region is poised to see a sharp increase in demand for high-throughput satellite capacity, JSAT said. High-throughput satellites use smaller beams, frequency reuse technologies and, increasingly, reprogrammable payloads to link buildings, ships, airplanes and other platforms to the internet.

Citing figures from Northern Sky Research, JSAT said the Asia-Pacific should go from generating $200 million in revenue industry-wide in its fiscal 2017 to $1 billion in fiscal 2022. By JSAT’s fiscal year 2027, the company expects Asia-Pacific high-throughput satellite revenues to reach $2.5 billion.

“We will make concerted efforts in the Space Business to seize upon this demand,” JSAT said.

Last year Arianespace launched JSAT’s first high-throughput satellite, Horizons-3e, on an Ariane 5 rocket. JSAT co-owns the satellite with Intelsat of the U.S. and Luxembourg through a joint venture.

A second high-throughput satellite, JCSAT-18, is scheduled to launch later this year on a SpaceX Falcon 9 rocket. JCSAT-18 shares a spacecraft bus with Kacific-1, a high-throughput payload from Singaporean startup Kacific that will focus on different geographic markets.

JSAT expects JCSAT-18 will help it grow in the energy sector, among other markets, by connecting wind turbines from Challenergy, a Tokyo startup designing turbines that can survive and even provide power from typhoons. JSAT participated in a $4.5 million capital raise Challenergy completed in March.

JSAT said competition with foreign satellite operators is increasing for connecting ships, planes and other mobile platforms, as well as in cellular backhaul. Several operators are planning new high-throughput satellites for the Asia-Pacific, including Measat in Malaysia, PSN of Indonesia, and California-based Viasat.

LEO and high-altitude platforms

To support future high-speed 5G networks, JSAT said it has partnered with U.S.-based Elefante Group to study how stratospheric airships can provide high-capacity links without the signal lag inherent with geostationary satellite broadband.

Elefante Group is developing a high-altitude vehicle called the Stratospheric Platform Station, or STRAPS, with Lockheed Martin. In a January filing to the U.S. Federal Communications Commission, Elefante Group said its baseline STRAPS model would be able to provide a terabit of capacity up and down over a 15,400 square-kilometer area from an altitude of 20 kilometers.

JSAT said it is assessing STRAPS deployment in Japan starting in the company’s fiscal year 2023.

Ventures planning and now deploying large constellations of low-Earth orbit satellites are reshaping the communications landscape, JSAT said, but were not highlighted as an area of investment for communications purposes.

JSAT made no mention of a 2017 investment in LEO broadband startup LeoSat in its report. Instead, JSAT described remote sensing as the main LEO opportunity it sees.

JSAT said it has growing demand from “government-type” organizations for imagery from Planet’s constellation of Earth observation satellites. JSAT invested undisclosed amounts in Planet in December, and geospatial analytics firm Orbital Insight in January.

JSAT said the Japan Aerospace Exploration Agency has agreed to transfer a 50-kilogram demonstration satellite, SDS-4, to the operator.

Launched in 2012 as a rideshare on a Mitsubishi Heavy Industries H2A rocket, SDS-4 carries an automatic identification system payload for ship tracking.

SDS-4 will be JSAT’s first LEO satellite, the company said, joining its fleet of 17 geostationary spacecraft.

JSAT said it signed a contract with Pasco Corp. in March to add two Japanese ground stations, one in Hokkaido and another in Okinawa, to its network, increasing the number of sites it has to three when combined with its Superbird Ibaraki Network Control Center.

JSAT said it also won a contract from LEO remote sensing company Axelspace to link the startup’s satellites with its ground stations. The contract marks JSAT’s first win with Norwegian partner KSAT following a strategic alliance the companies struck in 2016.

#Space

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sciencespies · 5 years

Text

Sky Perfect JSAT, challenged by TV business, hedges bets on HAPS, 5G, HTS and smallsats

https://sciencespies.com/space/sky-perfect-jsat-challenged-by-tv-business-hedges-bets-on-haps-5g-hts-and-smallsats/

Sky Perfect JSAT, challenged by TV business, hedges bets on HAPS, 5G, HTS and smallsats

JSAT has lost more than half a million satellite television subscribers since 2013, when that business reached 3.83 million subscribers — the highest level in JSAT’s history.

In an annual report released Aug. 30, JSAT tallied 3.25 million subscribers for its SKY PerfecTV! satellite broadcasting business as of March 31, when its fiscal 2018 concluded.

JSAT said its total revenue for the year was 164 billion yen after subtracting “consolidated eliminations.”

Asia’s high-throughput potential

“We will make concerted efforts in the Space Business to seize upon this demand,” JSAT said.

LEO and high-altitude platforms

JSAT said it is assessing STRAPS deployment in Japan starting in the company’s fiscal year 2023.

JSAT made no mention of a 2017 investment in LEO broadband startup LeoSat in its report. Instead, JSAT described remote sensing as the main LEO opportunity it sees.

JSAT said the Japan Aerospace Exploration Agency has agreed to transfer a 50-kilogram demonstration satellite, SDS-4, to the operator.

Launched in 2012 as a rideshare on a Mitsubishi Heavy Industries H2A rocket, SDS-4 carries an automatic identification system payload for ship tracking.

SDS-4 will be JSAT’s first LEO satellite, the company said, joining its fleet of 17 geostationary spacecraft.

Join us on Facebook or Twitter for a regular update.

#Space

#08-2019 Science News #Physics/Space/Nature/Humans/History #Science #Science News #Space

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