To properly sizing the amount of capacitor (kVAR) required to correct the lagging power factor,we must have three (3) important of information below:

• kW (kilowatts)

• Existing Power Factor ( % )

• Desired Power Factor ( % )

From this information,now we can calculate the capacitor size for power factor correction.The formula to calculate the required kVAR is:

Calculation Example :

1 unit air-compressor ( 3 phase 415 VAC ) used an average of 90 kW with an existing power factor of 80%.The desired power factor is 95%. The factor value for this case is 0.421 to raise the power factor from 80% to 95% using table 1.

0.421 x 90 kW = 38 kVAR

To recursively set prop for pool/fs/root and descendants with the exception of a few (eg mountpoint) non-inherited props:
zfs set prop=val pool/fs/root

Recursively reset (restore prop to inherited (if set "higher" in the tree) or default otherwise, or remove (if a user prop)):
zfs inherit -r prop pool/fs/root
//

You can delete a user property (those with a colon, e.g. com.sun:auto-snapshot:yearly) with the zfs inherit command, e.g
zfs inherit com.sun:auto-snapshot:yearly <dataset>

From RTFM zfs(8): Use the "zfs inherit" command to clear a user property. If the property is not defined in any parent dataset, it is removed entirely. Property values are limited to 1024 characters. //

Inheriting nonexistance, thats fun. I think a parent should be able to force behavior on its lineage, as well as trusting the child to imitate its behavior. Maybe the developers are training us to be better parents.

SB Energy Corp., a U.S. renewable-energy firm that’s an arm of Japan’s SoftBank Group, is making a record purchase of the batteries manufactured by Energy Storage Systems. The Oregon company says it has new technology that can store renewable energy for longer and help overcome some of the reliability problems that have caused blackouts in California and record-high energy prices in Europe.

The units, which rely on something called “iron-flow chemistry,” will be used in utility-scale solar projects dotted across the U.S., allowing those power plants to provide electricity for hours after the sun sets. //

The battery is made of iron salt and water,” said Hossfeld. “Unlike lithium-ion batteries, iron flow batteries are really cheap to manufacture.”

Every battery has four components: two electrodes between which charged particles shuffle as the battery is charged and discharged, electrolyte that allows the particles to flow smoothly and a separator that prevents the two electrodes from forming a short circuit.

Flow batteries, however, look nothing like the battery inside smartphones or electric cars. That’s because the electrolyte needs to be physically moved using pumps as the battery charges or discharges. That makes these batteries large, with ESS’s main product sold inside a shipping container.

What they take up in space, they can make up in cost. Lithium-ion batteries for grid-scale storage can cost as much as $350 per kilowatt-hour. But ESS says its battery could cost $200 per kWh or less by 2025.

In order to calculate power factor correction for your installation, your should follow the steps below: //

At the end of the spreadsheet you will get the calculation of the energy savings for above power factor correction.

This collection contains selected historically important software packages from the Internet Archive's software archives. Through the use of in-browser emulators, it is possible to try out these items and experiment with using them, without the additional burdens of installing emulator software or tracking down the programs.

A simple cooling system driven by the capture of passive solar energy could provide low-cost food refrigeration and living space cooling for impoverished communities with no access to the electricity grid. The system, which has no electrical components, exploits the powerful cooling effect that occurs when certain salts are dissolved in water. After each cooling cycle, the system uses solar energy to evaporate the water and regenerate the salt, ready for reuse. //

After comparing a range of salts, ammonium nitrate (NH4NO3) proved to be the standout performer, with a cooling power more than four times greater than its closest competitor, ammonium chloride (NH4Cl). The ammonium nitrate salt’s exceptional cooling power can be attributed to its high solubility. “NH4NO3’s solubility reached 208 grams per 100 grams of water, whereas the other salts were generally below 100 grams,” Wenbin says. “This salt’s other advantage is that it is very cheap and already widely used as fertilizer,” he adds.

The system has good potential for food storage applications, the team showed. When the salt was gradually dissolved in water in a metal cup placed inside a polystyrene foam box, the temperature of the cup fell from room temperature to around 3.6 degrees Celsius and remained below 15 degrees Celsius for over 15 hours. //

Reference: ” Conversion and storage of solar energy for cooling” by Wenbin Wang, Yusuf Shi, Chenlin Zhang, Renyuan Li, Mengchun Wu, Sifei Zhuo Sara Aleida and Peng Wang, 1 September 2021, Energy & Environmental Science.
DOI: 10.1039/D1EE01688A

An Austrian-based company is working on a patented propulsion technology for VTOLs (vertical take-off and landing) and has recently shared the first test flight of a prototype aircraft using the unique approach. //

In the footage released by CycloTech, the prototype is tethered and tested indoors. Finally, the aircraft is able to successfully take off, hover in the air, and land. While it is not the same as actually testing the technology outside, it is nevertheless a good start in wind conditions.

CycloTech claims its rotor technology brings several advantages. Precision is one notable benefit of the CycloRotor. Being able to steer the magnitude and direction of thrust 360 degrees around the rotation axis of every single rotor offers better maneuverability of the aircraft.

the Congressional Budget Office (CBO) published a paper demonstrating what would happen if a sustained increase in federal spending were coupled with big tax increases to pay for the spending.

While the analysis points to different long-term effects from different types of taxes, any tax-and-spend approach would lead to reductions in economic growth and personal income that are larger than the size of the tax hikes.

For example, the analysis found that having 10% more federal government would mean a 12% to 19% reduction in personal consumption.

And that’s a conservative estimate. Most estimates show tax hikes shrink the economy by two to three times more than the revenues they raise. //

While the Biden administration has repeatedly claimed that it will only seek to raise taxes on the wealthy, a government of the size that they’re seeking would require amounts of money that can only be generated through steep across-the-board tax increases on middle-class Americans.

Regardless of whether those taxes are levied tomorrow or in a few years, they would be an inevitable part of expanding the size and scope of the federal government.

Rather than continuing down the path of centralized power and socialism, lawmakers should recognize the costs associated with endless federal spending and chart a course towards financial responsibility and prosperity.

Why in the world was the passenger in custody for “several hours”? They didn’t do anything wrong.

In short the reason is due to,

1, Uncertainty.
2, Political wallpapering. //

So “uncertainty” will always be there even if the probavility is very small.

Which is where we move from demonstrating “uncertainty” to demonstrating “political wallpapering”.

From a political perspective if it became known after a bomb went off that some one had alerted the authorities and the authorities failed to investigate then it would at the very least be a total PR disaster[2] for the politicians.

So to avoid such “PR disasters” happening for “Politicians” they have authorities under their nominal control issue avoidence rules that effectively say,

“Until proven otherwise all notified threats are to be treated as credible and must be acted upon.”

So if person B says the object person A has in their possession is a security threat the “Untill proven otherwise…” rule kicks in untill the uncertainty is resolved.

However this rule is not just in relation to aircraft security… //

Thus a “Political Rule” has become a weapon in it’s own right. That can be used against individuals and organisations via “denial of XXX” be it “Service”, “Rights”, “Liberty”, “Reputation”, etc, etc.

As we saw with the “bomb in a printer” scare, some years back, the bomb does not have to be viable in any way what so ever to cause very substantial damage.

The thing is it is a “no win” issue no matter what you do. 9/11 two decades back happened because those who committed the acts, had previously tested and found they could get box-cutters onto aircraft in their pockets or “carry on”.

Any expert will tell you “any object can be seen as a weapon” all that has to be done is “Work out how to realise the transformation”.

With the ongoing retirement of the Boeing 747-400 and the end of production of the Airbus A380, there is no doubt four-engine aircraft are falling out of favor. Twin-engine aircraft have improved significantly, and many airlines are moving away from the high-capacity ‘hub and spoke’ model. It seems unlikely there will be a need anytime soon for a four-engine passenger aircraft, but perhaps it could re-appear for freight. //

Four engine production has declined as twin-engine operations have improved. In the early days of jet aircraft, a twin-engine aircraft (under FAA rules) could not fly more than 60 minutes away from a diversion airport. This hugely limited the possibilities for trans-oceanic flights. //

Along with this improvement in ETOPS, engine power has also increased. A 1958 Pratt & Whitney JT3D engine on the 707, for example, had a thrust of 17,000 pounds, versus the GE9X engine on the 777X with around 105,000 pounds of thrust. Manufacturers can now power large single-deck widebodies with two engines.

National leaders around the world are announcing big plans to return to nuclear energy now that the cost of natural gas, coal, and petroleum are spiking, and weather-dependent renewables are failing to deliver.

“The number one objective is to have innovative small-scale nuclear reactors in France by 2030 along with better waste management,” said French President Emmanuel Macron.

Macron had previously promised to reduce nuclear from 75 to 50 percent of its power, noted Financial Times. “But the mood has now changed,” the paper writes today. “Macron said on Tuesday he would begin investing in new nuclear projects ‘very quickly.’”