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jackassdemocrats · 24 days
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AOC is a genius.
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gearsandbranches · 20 days
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How is electricity actually made? - The Rankine Cykle
What do biomass power plants, coal power plants, concentrated solar power plants, nuclear power plants and dry steam geothermal power plants have in common? The Rankine Cykle.
When I learned about this system, the first question that I asked myself was "how can it be that this is the first time I´m learning this", because it´s such an important element to electricity production. It made me realize that I actually don´t know how electricity is produced, for example in a coal power plant, or in a nuclear power plant, or in a biomass power plant. And the answer is... We cook water.
Okay, it´s not quite that simple, but also not a lot more complicated. Let´s look at it in detail:
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(Source: S.Peake (2018): Renewable Energy. Power for a sustainable future. 4th edition. Oxford University Press.)
The first step is the pump. Here, water gets pumped into the system. The water gets pumped into a steam boiler where it gets cooked, so turned into pressurized steam. And that´s what the energy source is for! Be it coal, nuclear, biomass, solar, it´s used to heat water. This pressurized steam is then led through a steam turbine, which generates electriycity. The now low pressure vapour (which is still very hot) is lead through a condenser, to be turned back into water, which then reenters the cykle. Since the cooling water in the condenser is warmed up during the process, it can be user for district heating, which preserves some of the energy that isn´t being used in the steam turbine.
The whole process is not perfect, the level of efficiency which we used to calculate with in our classes and which is for example given for nuclear power plants here is about 33%. That means that only one third of the energy that is used for heating the water is actually turned into electricity. It gets a bit better if you use the residual heat for district heating, but the rest of the energy is lost. The system works essentially the same for everything you burn to produce heat, coal, biomass etc. It works a bit different for nuclear, where it´s the excess heat of the nuclear fission producing the heat, and in concentrated solar power plants, the heat from the sun melts salt, which is then used to produce stem. This enables the solar power plant to produce electricity even at night, since the salt can keep the heat for a few hours.
I think in order to decide which kind of energy production we should be using, it is important to know how they work. I was surprised how little I knew about the Rankine cycle as the general principal of energy production and I hope that I can spread the knowledge a little bit further.
Source: Source: S.Peake (2018): Renewable Energy. Power for a sustainable future. 4th edition. Oxford University Press. Pages 33-35.
Rankine Cycle - Steam Turbine Cycle | Characteristics | nuclear-power.com
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wayti-blog · 3 months
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"Researchers at the University Medical Center Göttingen (UMG) have discovered a new quality control mechanism that regulates energy production in human cells. This process takes place in mitochondria, the power plants of the cell."
"Mitochondria play a central role for cellular metabolism. Therefore, malfunctions of the mitochondria lead to serious, often fatal, heart, muscle or nerve diseases. Mitochondria are surrounded by two membranes, an outer and an inner one, which separate them from the surrounding cell. The final conversion of food into energy takes place in the inner membrane. Proteins are involved in this process.
Central proteins for energy production are formed in the mitochondria, transported to the inner membrane and inserted there. The protein OXA1L is mainly responsible for the insertion of proteins into the membrane, where larger complex structures are formed with other proteins that interact with each other and ensure energy production. How the incorporation and assembly of these structures works in detail has been poorly investigated thus far."
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West Virginia v. Environmental Protection Agency strikes down a federal environmental regulation of power plants that never took effect, that the Biden administration has no intention of reinstating, and that would have accomplished absolutely nothing even if it had be enforced.
Nevertheless, the Court voted along ideological lines to strike down this regulation that the EPA drafted under authority granted by the Clean Air Act, claiming that it amounts to an “extraordinary” overreach by the EPA. And their decision has enormous implications both for the environment and for the federal government more broadly.
At the very least, the West Virginia decision strips the EPA of its authority to shift energy production away from dirty coal-fired plants and toward cleaner methods of energy production — although market forces have thus far accomplished much of this shift on their own, because coal-fired plants are often more expensive to operate than cleaner plants. The decision could also lead to additions limits on the EPA’s ability to regulate that industry going forward.
The West Virginia decision confirms something that has been implicit in the Supreme Court’s recent decisions governing federal agencies’ power to issue binding regulations under authority granted by Congress: When a majority of the Supreme Court disagrees with a regulation pushed out by a federal agency, the Court has given itself the power to veto that regulation — and it will do so by invoking something known as the “major questions doctrine.”
Under this doctrine, the Court explained in a 2014 opinion, “we expect Congress to speak clearly if it wishes to assign to an agency decisions of vast ‘economic and political significance.’” Thus, if a majority of the Court deems a regulation to be too significant, it will strike it down unless Congress very explicitly authorized that particular regulation.
This doctrine comes from nowhere. Last week, the Court said that abortion is unprotected by the Constitution — leaning heavily on the fact that abortion is not mentioned in the Constitution. But the the major questions doctrine is also mentioned nowhere in the Constitution. Nor can it be found in any statute. The justices made it up. And, at least during President Joe Biden’s administration, the Court has wielded it quite aggressively to veto regulations that the Court’s conservative majority finds objectionable.
Roberts’s majority opinion in West Virginia does put some flesh on the fairly bare bones the Justices have previously used to describe when they will declare something to be a “major question.” Roberts faults the EPA for issuing a novel kind of regulation pursuant to a “long-extant” statute that had not previously been used to justify similar actions. He claims that the EPA relied on an “ancillary provision” of the Clean Air Act, rather than a more central provision of that law. And he criticizes the EPA for issuing a regulation which resembles bills that Congress previously considered but did not enact.
But these judgments are divorced from the text of the Clean Air Act itself. And Roberts admits that the major questions doctrine can nuke a regulation even when there is a “colorable textual basis” supporting that regulation — that is, when the actual words of a federal law could support the action taken by a federal agency.
The bottom line after the West Virginia decision is that agencies may still exercise regulatory authority, but only subject to a judicial veto. The Supreme Court has effectively placed itself at the head of much of the executive branch of the federal government.
FEDERAL REGULATIONS, BRIEFLY EXPLAINED
When Congress wishes to regulate businesses or private individuals, it can do so in two ways. One way is that it can simply command a person or industry to conduct business in a specific way. Congress may, for example, order health insurers to cover people with preexisting conditions. It may require employers to pay a minimum wage. Or it could insist that all power plants to install a particular device that reduces carbon emissions.
The problem with this direct approach, however, is that when Congress issues such a specific command, it can only change that command by enacting a new federal law. Suppose, for example, that Congress had passed a law in 1978 requiring coal-fired plants to install a particular device to reduce pollution. That device would almost certainly be obsolete today. Indeed, it could potentially interfere with more recent technology that would do a much better job of limiting emissions.
So Congress also has the power to delegate regulatory authority to a federal agency: laying out a broad policy goal that the agency must try to solve, then giving the agency a fair amount of discretion to determine, in its own expert opinion, how to solve it. This allows federal law to be more adaptive, with regulations shifting as new facts justify updated rules.
Congress, for example, could not have known in 2010, when the Affordable Care Act became law, that a deadly new disease would emerge in 2019 that would paralyze much of the world economy until vaccines made it safe for most people to emerge from their homes. But COVID-19 vaccines are still covered by health insurance, partly because the Affordable Care Act contains a provision requiring the Department of Health and Human Services to maintain a list of vaccines that health insurers must cover — while also permitting HHS to add new vaccines to this list as new diseases and immunizations emerge.
The provision of the Clean Air Act at the heart of the West Virginia case functions similarly. It requires certain power plants to use the “best system of emission reduction” that can be achieved with currently available technology, while also accounting for factors like cost. The EPA, meanwhile, has the authority to determine what the “best system” is at any given moment, and it can issue new regulations requiring energy companies to adopt new systems as technology advances.
The Court’s decision in West Virginia does not strip the EPA of this authority entirely — the agency might still be able to require coal-fired plants to install certain devices, for example — but it drastically reduces the EPA’s power. And it warns the EPA — and every other federal agency — against using its regulatory power in new ways, lest the Supreme Court be tempted to invoke the major questions doctrine and veto the agency’s rule.
THE ACTUAL REGULATION AT ISSUE IN WEST VIRGINIA DID NOTHING AT ALL
One irony of Chief Justice Roberts’ declaration that West Virginia is an “extraordinary case” that requires the Supreme Court to exercise its self-given veto power over federal regulations is that the actual regulation at issue in the case didn’t amount to much of anything.
The case involves the Clean Power Plan, an Obama-era effort to fight climate change, which was touted as the Obama administration’s most ambitious climate policy initiative when it was announced in 2015. Roberts’ opinion speaks of this plan in alarmist terms, pointing to seven-year-old projections which claimed that the plan “would entail billions of dollars in compliance costs,” “eliminate tens of thousands of jobs,” and “would cause retail electricity prices to remain persistently 10% higher in many States.”
Meanwhile, Obama’s EPA predicted that, by 2030, the Clean Power Plan would lower carbon emissions from power plants by about a third below where they stood in 2005.
But the Clean Power Plan never took effect; the Supreme Court voted along party lines in 2016 to temporarily block it, and it was later abandoned by the Trump administration. It also turns out that it wouldn’t have done anything even if it had been in effect.
That’s because the plan relied upon what Roberts labels “generation shifting” — shifting the production of energy from dirtier coal-fired plants to other, cleaner sources of energy. And the energy industry didn’t actually need a government regulation to force it to shift away from coal-fired plants because the oldest, dirtiest plants are more expensive to operate than cleaner plants. So the dirtiest plants were retired.
The energy industry wound up achieving the Clean Power Plan’s 2030 emissions reduction goals by 2019, not because of the heavy hand of regulation, but because of good ol’ free market capitalism. (Coal executives also complained that unrelated Obama-era rules restricting mercury emissions also led them to shut down coal plants.)
Nevertheless, West Virginia deems the Clean Power Plan to be a sin against the major questions doctrine because the impotent plan attempted to “substantially restructure the American energy market” by changing how electricity would be produced. The holding of West Virginia is that the Clean Air Act “did not clearly authorize the EPA to engage in a ‘generation shifting approach’ to the production of energy in this country.”
Again, this is a policy judgment. The text of the Clean Air Act instructs the EPA to determine the “best system of emission reduction.” It does not say that the “best system” cannot involve shifting the energy industry away from coal and toward cleaner power.
But, in inventing the major questions doctrine out of thin air, the Supreme Court gave itself the power to make these kinds of policy judgements.
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environmentalwatch · 11 months
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The Death Toll of Air Pollution
The Death Toll of Air Pollution Rises
The death toll of air pollution is around nine million lives per year, according to two new reports published this week by medical journals. On Tuesday, the Lancet Planetary Health journal published a report by Richard Fuller. This report compiled analyses of health risk of air, water, and toxic chemical pollution in 2019. Its results indicate that those forms of pollution are responsible for…
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Renewable energy is becoming increasingly important as the world seeks to reduce its reliance on fossil fuels and transition to a more sustainable energy system. Wave energy, in particular, has gained attention as a potential renewable energy source that can be harnessed from the ocean. In this paper, we will discuss the progress made in testing renewable energy off wave generation in the ocean, how far the technology has advanced, whether wave generation energy is a viable renewable energy source for the future, and how wave generation generates energy.
Wave energy refers to the energy that is present in the ocean's waves, which can be converted into electricity. There are different ways of harnessing wave energy, but the most common method involves using a device that captures the kinetic energy of the waves and converts it into electrical power. These devices are typically installed offshore and can be connected to the grid to supply electricity to homes and businesses.
The technology for harnessing wave energy is still in the early stages of development, but there have been significant advances in recent years. There are currently several prototype devices in operation around the world, including the Pelamis, the Wave Dragon, and the Oyster. These devices use different methods for capturing wave energy, but all have the same goal of converting the kinetic energy of the waves into electricity.
The Pelamis is a wave energy converter that consists of several connected cylindrical sections that move in response to wave motion. The movement of the sections drives hydraulic pumps, which in turn drive generators to produce electricity. The Wave Dragon is a floating platform that uses the motion of the waves to drive turbines, which generate electricity. The Oyster is a device that captures the energy of nearshore waves and uses it to pump high-pressure water to an onshore turbine, which generates electricity.
Despite the progress that has been made, wave energy is still not a viable renewable energy source for the future. One of the main challenges of wave energy is that it is an intermittent source of energy. Unlike solar and wind energy, which can be generated consistently throughout the day, wave energy is dependent on the ocean's waves, which are influenced by a variety of factors, including wind, tides, and weather patterns. This makes it difficult to predict and plan for wave energy production, which can make it difficult to integrate into the grid.
Another challenge of wave energy is that the devices used to capture it can be expensive and difficult to maintain. Offshore devices are subject to harsh environmental conditions, including saltwater corrosion and high waves, which can cause wear and tear on the devices. This can result in high maintenance costs, which can make wave energy more expensive than other renewable energy sources, such as solar and wind.
Despite these challenges, there is still significant potential for wave energy as a renewable energy source. According to a report by the US Department of Energy, wave energy has the potential to supply up to 20% of the country's electricity needs by 2050 [[3]]. This potential is due in part to the fact that wave energy is a much denser source of energy than wind, which means that it can generate more electricity per unit of area. Additionally, there are vast areas of the ocean that are suitable for wave energy production, which means that there is significant potential for scaling up the technology.
In conclusion, wave energy is a promising renewable energy source that has the potential to play a significant role in our transition to a more sustainable energy system. While the technology for harnessing wave energy is still in the early stages of development, there have been significant advances in recent years, and there is still significant potential for further development. However, wave energy is still not a viable renewable energy source for the future, due to its intermittent nature and high maintenance costs. Nevertheless, with the right policies and investments, wave energy has the potential to become an important renewable energy producer.
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jcmarchi · 21 days
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What Are The Opportunities Presented by Quantum Computing? - Technology Org
New Post has been published on https://thedigitalinsider.com/what-are-the-opportunities-presented-by-quantum-computing-technology-org/
What Are The Opportunities Presented by Quantum Computing? - Technology Org
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Quantum computers have always been touted as “magical” devices in science-fiction movies – however, their impact may soon become a reality.
ISI’s Itay Hen, Research Team Leader at the Hen Lab, is leading a multi-institutional effort funded by the US Department of Defense (specifically DARPA) to figure out how to test the capabilities of quantum computers. 
Together with fellow ISI researcher Amir Kalev, USC Dornsife professor Rosa Di Felice and others, Hen is investigating the opportunities presented by quantum technologies. 
 “Quantum computers promise many more things than standard computers,” explained Hen. “DARPA wanted to know whether to invest in building large-scale quantum computers, and what society could gain from them.”
The research team doesn’t just identify problems that quantum computers could help with, but they also quantify clear benchmarks for testing and determine the required resources. 
“We need to ensure we stay on track and develop our efforts where quantum is useful,” Kalev added. 
Merging science with application 
Hen gathered multi-disciplinary teams to ensure their contributions were impactful. Subject matter experts devised applicable questions, while quantum computing scientists distilled their computational aspects. 
Di Felice is one of these subject matter experts. She noted, “I identify theories and resources needed to solve the problems we’re interested in, and explain why it’s more suitable for quantum as opposed to classical computing methods.”
At times, communication was a challenge.
 “At first, it felt like we were speaking different languages. We quantum information scientists had to explain our thoughts in more grounded language, and not describe things in terms of abstract, algorithmic values,” Hen recalled. 
Questions for quantum  
“Quantum computers could help discover new materials with esoteric properties,” said Hen. “They can also solve complicated differential equations, predicting how complex systems, such as the stock market, operate and behave.”
One of their proposed questions is whether quantum computers could help find new superconductors.
A superconductor is a high-efficiency material that runs electrical currents without resistance. Normal electrical currents generate a lot of heat and wasted energy, while superconductors can run currents without generating heat.
As superconductors usually work at low temperatures, the researchers wondered if quantum computers can find some that work at room temperatures, which could become a core component of technological advances. 
“For example, it’s impossible to run a train on superconducting material because things would have to be very cold,” remarked Kalev. “With room-temperature superconductors, this would be feasible.”
Solving the yet unsolvable
So far, the research teams have discovered intriguing techniques to devise problems that no existing computer can solve. If quantum computers prove to be effective at solving these problems, they might transform society for the better.
“We needed to formulate questions that we know the answer to, but are impossible for standard computers to solve,” said Hen. 
Hen and the others are also planning for a future where quantum’s impact continues to grow and spread.  
Di Felice noted, “Our research motivates other scientists to work harder to create quantum chips. Quantum computing could tap into more industries like health and energy production.”
Source: USC
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head-post · 1 month
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Over 20% of the world’s refining capacity under threat
More than 20 per cent of the world’s refining capacity is at risk of closure, energy consultancy Wood Mackenzie has found in an analysis released on Thursday, as gasoline profitability declines and pressure to cut carbon dioxide emissions intensifies, according to Reuters.
The company analysed 465 refining assets. Europe and China have the largest number of facilities with high closure risk, jeopardising about 3.9 million barrels per day of refining capacity, according to Wood Mac. The analysis is based on an assessment of net cash margins, cost of carbon emissions, ownership, environmental investment and strategic value of refineries.
The report reveals that there are 11 sites in Europe that account for 45 per cent of all high-risk facilities. According to industry organisation Concawe, some 30 European refineries have already closed since 2009, with almost 90 still operating.
The tide of closures was driven by competition from new and more sophisticated businesses in the Middle East and Asia, as well as the impact of the COVID-19 pandemic.
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deanablondell · 6 months
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Create your own protection magick spells with this protection magick correspondences video!! I cover crystals, herbs, symbols and more! 🔮🌿✨
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nepalenergyforum · 8 months
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Nepal Aims to Export Electricity to Bangladesh : Minister Basnet
Chitwan, Aug 22: Minister for Energy, Water Resources and Irrigation, Shakti Bahadur Basnet, has said a power trade agreement will be soon reached with Bangladesh. Talking to journalists at the Bharatpur airport today, he made it clear that the announcement of the agreement would also be made within this year. “Some topics remain to be formalized and this is also in the final phase. It goes into…
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electronalytics · 8 months
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Bio-Energy Market Report, Research Outlook, Products, and Application 2017 – 2032
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Overview of the Bio-Energy Market:
The production, delivery, and use of energy obtained from biomass resources are all part of the bioenergy market. The term "biomass" refers to organic materials that can be used to create energy through a variety of processes, such as combustion, gasification, and biochemical conversion, such as plants, agricultural residues, forestry residues, and organic waste. Biomass may be refilled through sustainable practises, which is why bioenergy is regarded as a renewable energy source.
The global bioenergy market size was valued at $102.5 billion in 2020, and is expected to reach $217.8 billion by 2030, registering a CAGR of 7.6% from 2021 to 2030.
Key Factors Driving the Bio-Energy Market:
Transition to Renewable Energy: The bioenergy sector is significantly influenced by the global move to renewable energy sources. As a renewable and environmentally friendly substitute for fossil fuels, bioenergy helps to slow global warming by lowering greenhouse gas emissions.
Energy Independence and Security: By utilising a variety of energy sources, bioenergy can help with energy security. Countries with plentiful biomass resources can increase their energy independence and decrease their reliance on imported fossil fuels.
Government Policies and Incentives: Countless countries around the world have put policies and incentives in place to encourage the use of bioenergy. These policies stimulate the creation and application of bioenergy technology and include feed-in tariffs, renewable energy objectives, tax incentives, and subsidies.
Concerns for the environment and carbon neutrality: Bioenergy is regarded as a carbon-neutral energy source because the carbon dioxide.
Waste Management and Circular Economy: Bio-energy can play a role in waste management by utilizing organic waste materials for energy production. This contributes to the circular economy concept, where waste is seen as a resource, promoting sustainable resource utilization and waste reduction.
Technological Advancements and Efficiency Improvements: Advances in bio-energy technologies, such as improved biomass conversion processes, biofuel production techniques, and efficient combustion systems, enhance the efficiency and economic viability of bio-energy. Technological advancements make bio-energy more competitive and attractive in the energy market.
Regional Variations in Biomass Resource Accessibility: There are regional differences in the accessibility and availability of biomass resources. Countries with an abundance of biomass resources, such as forestry waste and agricultural wastes, provide favourable conditions for the development of bioenergy.
Rural Development and Job Creation: By generating jobs in the biomass production, processing, and bioenergy plant operations, bioenergy initiatives frequently have a favourable effect on rural regions. Rural development and economic expansion are aided by this.
We recommend referring our Stringent datalytics firm, industry publications, and websites that specialize in providing market reports. These sources often offer comprehensive analysis, market trends, growth forecasts, competitive landscape, and other valuable insights into this market.
By visiting our website or contacting us directly, you can explore the availability of specific reports related to this market. These reports often require a purchase or subscription, but we provide comprehensive and in-depth information that can be valuable for businesses, investors, and individuals interested in this market.
“Remember to look for recent reports to ensure you have the most current and relevant information.”
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Market Segmentations:
Global Bio-Energy Market: By Company
• Abengoa Bioenergy
• Amyris
• BP
• Butamax Advanced Biofuels
• Ceres
• Enerkem
• Joule Unlimited
• LanzaTech
• Novozymes
• Sapphire Energy
Global Bio-Energy Market: By Type
• Bioethanol
• Biodiesel
• Biogas
• Others
Global Bio-Energy Market: By Application
• Transportation
• Off-grid Electricity
• Cooking
• Others
Global Bio-Energy Market: Regional Analysis
The regional analysis of the global Bio-Energy market provides insights into the market's performance across different regions of the world. The analysis is based on recent and future trends and includes market forecast for the prediction period. The countries covered in the regional analysis of the Bio-Energy market report are as follows:
North America: The North America region includes the U.S., Canada, and Mexico. The U.S. is the largest market for Bio-Energy in this region, followed by Canada and Mexico. The market growth in this region is primarily driven by the presence of key market players and the increasing demand for the product.
Europe: The Europe region includes Germany, France, U.K., Russia, Italy, Spain, Turkey, Netherlands, Switzerland, Belgium, and Rest of Europe. Germany is the largest market for Bio-Energy in this region, followed by the U.K. and France. The market growth in this region is driven by the increasing demand for the product in the automotive and aerospace sectors.
Asia-Pacific: The Asia-Pacific region includes Singapore, Malaysia, Australia, Thailand, Indonesia, Philippines, China, Japan, India, South Korea, and Rest of Asia-Pacific. China is the largest market for Bio-Energy in this region, followed by Japan and India. The market growth in this region is driven by the increasing adoption of the product in various end-use industries, such as automotive, aerospace, and construction.
Middle East and Africa: The Middle East and Africa region includes Saudi Arabia, U.A.E, South Africa, Egypt, Israel, and Rest of Middle East and Africa. The market growth in this region is driven by the increasing demand for the product in the aerospace and defense sectors.
South America: The South America region includes Argentina, Brazil, and Rest of South America. Brazil is the largest market for Bio-Energy in this region, followed by Argentina. The market growth in this region is primarily driven by the increasing demand for the product in the automotive sector.
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Reasons to Purchase Bio-Energy Market Report:
• To gain insights into market trends and dynamics: this reports provide valuable insights into industry trends and dynamics, including market size, growth rates, and key drivers and challenges.
• To identify key players and competitors: this research reports can help businesses identify key players and competitors in their industry, including their market share, strategies, and strengths and weaknesses.
• To understand consumer behaviour: this research reports can provide valuable insights into consumer behaviour, including their preferences, purchasing habits, and demographics.
• To evaluate market opportunities: this research reports can help businesses evaluate market opportunities, including potential new products or services, new markets, and emerging trends.
• To make informed business decisions: this research reports provide businesses with data-driven insights that can help them make informed business decisions, including strategic planning, product development, and marketing and advertising strategies.
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bizzview · 9 months
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Navigating tax equity in the US presents its fair share of challenges. However, by skillfully leveraging tax incentives and mastering the system's intricacies, one can unlock the full potential of renewables. It's a clever way not only to drive economic success but also to make a significant positive impact on the environment. 💚💼 Making Green by Going Green! ✨ What sets this model apart? ✨  🔹 Tailored financial analysis that precisely addresses the needs of PV farm projects.  🔹 Efficient management of capital accounts and careful consideration of tax basis.  🔹 Flexibility to explore back leverage loan options for optimized financing.  🔹 Seamless allocation of income and cash flow/waterfall among partners.  🔹 Reliable projections to empower confident decision-making.  🔹 Robust reporting and analysis capabilities.
👉 Access the model now to unlock the full potential of your PV farm partnerships. Let's propel the renewable energy revolution forward! 
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bluegiragi · 3 months
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open wide.
early access + nsfw on patreon
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uhardite · 5 months
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Study while others are sleeping.
Decide while others are delaying.
Prepare while others are daydreaming.
Begin while others are procastinating.
Work while others are wishing.
Save while others are wasting.
Listen while others are talking.
Persist while others are quitting.
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The principal reactions associated with the classic glycolytic pathway in plants are almost identical to those in animal cells (Figure 12.3). (...) UDP-glucose pyrophosphorylase then converts UDP-glucose and pyrophosphate (PPi) into UTP and glucose 6-phosphate (see Figure 12.3). (...) These reactions also include two of the three essentially reversible reactions of the glycolytic pathway, which are catalyzed by hexokinase and phosphofructokinase (see Figure 12.3). (...) The phosphorylated carboxylic acid on carbon 1 of 1,3-bisphosphoglycerate (see Figure 12.3) has a large standard of free-energy change (∆G⁰') of hydrolysis (-49.3 kJ/mol). (...) Because the glycolytic reaction catalyzed by ATP-dependent phosphofructokinase is essentially irreversible (see Figure 12.3), an additional enzyme, fructose-1,6-bisphosphate phosphatase, converts fructose 1,6-bisphosphate irreversibly into fructose 6-phosphate and Pi during gluconeogenesis. (...) In plants, the interconversion of fructose 6-phosphate and fructose 1,6-bisphosphate is made more complex by the presence of an additional (cytosolic) enzyme, PPi-dependent phosphofructokinase (pyrophosphate: fructose 6-phosphate 1-phosphotransferase), which catalyzes the following reversible reaction (see Figure 12.3):
Fructose 6-P + PPi → fructose 1,6-bisphosphate + Pi
where -P represents a bound phosphate.
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The oxaloacetate is then reduced to malate by the action of malate dehydrogenase, which uses NADH as a source of electrons (see Figure 12.3). (...) To overcome this limitation, plants and other organisms can further metabolize pyruvate by carrying out one or more forms of fermentation (see Figure 12.3). (...) Pyruvate kinase and PEP carboxylase, the enzymes that metabolize PEP in the last steps of glycolysis (see Figure 12.3), are in turn sensitive to feedback inhibition by citric acid cycle intermediates and their derivatives, including malate, citrate, 2-oxoglutarate, and glutamate. (...) As already described, malate can be synthesized from PEP in the cytosol via the enzymes PEP carboxylase and malate dehydrogenase (see Figure 12.3). (...) For example, during anaerobic stress caused by flooding, roots ferment pyruvate to lactate through the action of lactate dehydrogenase (see Figure 12.3). (...) These changes in enzyme activity quickly lead to a switch from lactate to ethanol production (see Figure 12.3).
"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.
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