Wednesday 28 August 2019

Researchers develop a better way to harness the power of solar panels

Researchers develop a better way to harness the power of solar panels

Researchers develop a better way to harness the power of solar panels

solar panel
Credit: CC0 Public Domain

Researchers at the University of Waterloo have developed a way to better harness the volume of energy collected by solar panels.

In a new study, the researchers developed an algorithm that increases the efficiency of the solar photovoltaic (PV) system and reduces the volume of power currently being wasted due to a lack of effective controls.

"We've developed an algorithm to further boost the power extracted from an existing solar panel," said Milad Farsi, a Ph.D. candidate in Waterloo's Department of Applied Mathematics. "Hardware in every solar panel has some nominal efficiency, but there should be some appropriate controller that can get out of .

"We do not change the hardware or require additional circuits in the solar PV system. What we developed is a better approach to controlling the hardware that already exists."

The new algorithm enables controllers to better deal with fluctuations around the maximum power point of a solar PV system, which have historically led to the wasting of potential energy collected by panels.

"Based on the simulations, for a small home-use including 12 modules of 335W, up to 138.9 kWh/year can be saved," said Farsi, who undertook the study with his supervisor, Professor Jun Liu of Waterloo's Department of Applied Mathematics. "The savings may not seem significant for a small home-use solar system but could make a substantial difference in larger-scale ones, such as a solar farm or in an area including hundreds of thousands of local solar panels connected to the .

"Taking Canada's largest PV plant, for example, the Sarnia Photovoltaic Power Plant, if this technique is used, the savings could amount to 960,000 kWh/year, which is enough to power hundreds of households. If the saved energy were to be generated by a coal-fired plant, it would require emission of 312 tonnes of CO2 into the atmosphere."

Milad further pointed out that the savings could be even more substantial under a fast-changing ambient environment, such as Canadian weather conditions, or when the loss in the converters due to the undesired chattering effects seen in other conventional control methods is taken into account.

The study, Nonlinear Optimal Feedback Control and Stability Analysis of Solar Photovoltaic Systems, authored by Waterloo's Faculty of Mathematics researchers Farsi and Liu, was recently published in the journal IEEE Transactions on Control Systems Technology.



More information: Milad Farsi et al, Nonlinear Optimal Feedback Control and Stability Analysis of Solar Photovoltaic Systems, IEEE Transactions on Control Systems Technology (2019). DOI: 10.1109/TCST.2019.2929149

Friday 5 April 2019

8 Herbal Teas to Help Reduce Bloating - EcoWatch

8 Herbal Teas to Help Reduce Bloating - EcoWatch

8 Herbal Teas to Help Reduce Bloating

By Marsha McCulloch, MS, RD

If your abdomen sometimes feels swollen and uncomfortable, you're not alone. Bloating affects 20–30% of people (1).

Many factors may trigger bloating, including food intolerances, a buildup of gas in your gut, imbalanced intestinal bacteria, ulcers, constipation and parasitic infections (1, 2, 3, 4).

Traditionally, people have used natural remedies, including herbal teas, to relieve bloating. Preliminary studies suggest that several herbal teas may help soothe this uncomfortable condition (5).

Here are 8 herbal teas to help reduce bloating.

1. Peppermint

In traditional medicine, peppermint (Mentha piperita) is widely recognized for helping soothe digestive issues. It has a cool, refreshing flavor (6, 7).

Test-tube and animal studies suggest that plant compounds called flavonoids found in peppermint may inhibit the activity of mast cells. These are immune system cells that are abundant in your gut and sometimes contribute to bloating (7, 8).

Animal studies also show that peppermint relaxes the gut, which may relieve intestinal spasms — as well as the bloating and pain that can accompany them (7).

Additionally, peppermint oil capsules may alleviate abdominal pain, bloating, and other digestive symptoms (9).

Peppermint tea hasn't been tested for bloating. However, one study found that a single tea bag supplied six times more peppermint oil than a serving of peppermint leaf capsules. Therefore, peppermint tea may be quite potent (10).

You can buy single-ingredient peppermint tea or find it in tea blends formulated for stomach comfort.

To make the tea, add 1 tablespoon (1.5 grams) of dried peppermint leaves, 1 tea bag, or 3 tablespoons (17 grams) of fresh peppermint leaves to 1 cup (240 ml) of boiled water. Let it steep for 10 minutes before straining.

Summary

Test-tube, animal, and human studies suggest that flavonoids and oil in peppermint may relieve bloating. Thus, peppermint tea may have similar effects.

2. Lemon Balm

Lemon balm (Melissa officinalis) tea has a lemony scent and flavor — along with hints of mint, as the plant is in the mint family.

The European Medicines Agency notes that lemon balm tea may relieve mild digestive issues, including bloating and gas, based on its traditional use (11, 12).

Lemon balm is a key ingredient in Iberogast, a liquid supplement for digestion that contains nine different herbal extracts and is available in North America, Europe, and other regions, as well as online.

This product may decrease abdominal pain, constipation, and other digestive symptoms, according to several human studies (13, 14, 15, 16).

However, lemon balm or its tea hasn't been tested alone for its effects on digestive issues in people. More research is needed.

To make the tea, steep 1 tablespoon (3 grams) of dried lemon balm leaves — or 1 tea bag — in 1 cup (240 ml) of boiled water for 10 minutes.

Summary

Traditionally, lemon balm tea has been used for bloating and gas. Lemon balm is also one of nine herbs in a liquid supplement shown effective for digestive issues. Human studies of lemon balm tea are needed to confirm its gut benefits.

3. Wormwood

Wormwood (Artemisia absinthium) is a leafy, green herb that makes a bitter tea. It's an acquired taste, but you can soften the flavor with lemon juice and honey.

Due to its bitterness, wormwood is sometimes used in digestive bitters. These are supplements made of bitter herbs and spices that may help support digestion (17).

Human studies suggest that 1-gram capsules of dried wormwood may prevent or relieve indigestion or discomfort in your upper abdomen. This herb promotes the release of digestive juices, which can help optimize healthy digestion and decrease bloating (17).

Animal and test-tube studies report that wormwood may also kill parasites, which can be a culprit in bloating (18).

However, wormwood tea itself hasn't been tested for anti-bloating effects. More research is necessary.

To make the tea, use 1 teaspoon (1.5 grams) of the dried herb per cup (240 ml) of boiled water, steeping for 5 minutes.

Notably, wormwood shouldn't be used during pregnancy, as it contains thujone, a compound that can cause uterine contractions (17).

Summary

Wormwood tea may stimulate the release of digestive juices, which may help relieve bloating and digestive issues. That said, human studies are needed.

4. Ginger

Ginger tea is made from the thick roots of the Zingiber officinale plant and has been used for stomach-related ailments since ancient times (19).

Human studies suggest that taking 1–1.5 grams of ginger capsules daily in divided doses may relieve nausea (20).

Additionally, ginger supplements may speed up stomach emptying, relieve digestive upset, and reduce intestinal cramping, bloating, and gas (19, 21).

Notably, these studies were done with liquid extracts or capsules rather than tea. While more research is needed, the beneficial compounds in ginger — such as gingerols — are also present in its tea (22).

To make tea, use 1/4–1/2 teaspoon (0.5‒1.0 grams) of coarsely powdered, dried ginger root (or 1 tea bag) per cup (240 ml) of boiled water. Steep for 5 minutes.

Alternately, use 1 tablespoon (6 grams) of fresh, sliced ginger per cup (240 ml) of water and boil for 10 minutes, then strain.

Ginger tea has a spicy flavor, which you can soften with honey and lemon.

Summary

Studies suggest that ginger supplements may relieve nausea, bloating, and gas. Ginger tea may offer similar benefits, but human studies are needed.

5. Fennel

The seeds of fennel (Foeniculum vulgare) are used to make tea and taste similar to licorice.

Fennel has traditionally been used for digestive disorders, including abdominal pain, bloating, gas, and constipation (23).

In rats, treatment with fennel extract helped protect against ulcers. Preventing ulcers may reduce your risk of bloating (3, 24).

Constipation is another contributing factor in some cases of bloating. Therefore, relieving sluggish bowels — one of fennel's potential health effects — may also resolve bloating (1).

When nursing-home residents with chronic constipation drank 1 daily serving of an herbal tea blend made with fennel seeds, they had an average of 4 more bowel movements over 28 days than those drinking a placebo (25).

Still, human studies of fennel tea alone are needed to confirm its digestive benefits.

If you don't want to use tea bags, you can buy fennel seeds and crush them for tea. Measure 1–2 teaspoons (2–5 grams) of seeds per cup (240 ml) of boiled water. Steep for 10–15 minutes.

Summary

Preliminary evidence suggests that fennel tea may protect against factors that increase bloating risk, including constipation and ulcers. Human studies of fennel tea are needed to confirm these effects.

6. Gentian Root

Gentian root comes from the Gentiana lutea plant, which bears yellow flowers and has thick roots.

The tea may initially taste sweet, but a bitter taste follows. Some people prefer it mixed with chamomile tea and honey.

Traditionally, gentian root has been used in medicinal products and herbal teas formulated to aid bloating, gas, and other digestive issues (26).

Additionally, gentian root extract is used in digestive bitters. Gentian contains bitter plant compounds — including iridoids and flavonoids — that stimulate the release of digestive juices and bile to help break down food, which may relieve bloating (17, 27, 28).

Still, the tea hasn't been tested in humans — and it's not advised if you have an ulcer, as it can increase stomach acidity. Thus, more research is needed (28).

To make the tea, use 1/4–1/2 teaspoon (1–2 grams) of dried gentian root per cup (240 ml) of boiled water. Steep for 10 minutes.

Summary

Gentian root contains bitter plant compounds that may support good digestion and relieve bloating and gas. Human studies are needed to confirm these benefits.

7. Chamomile

Chamomile (Chamomillae romanae) is a member of the daisy family. The herb's small, white flowers look like miniature daisies.

In traditional medicine, chamomile is used to treat indigestion, gas, diarrhea, nausea, vomiting, and ulcers (29, 30).

Animal and test-tube studies suggest that chamomile may prevent Helicobacter pylori bacterial infections, which are a cause of stomach ulcers and associated with bloating (30, 31).

Chamomile is also one of the herbs in the liquid supplement Iberogast, which has been shown to help decrease abdominal pain and ulcers (14, 32).

Still, human studies of chamomile tea are needed to confirm its digestive benefits.

The chamomile flowers contain the most beneficial components, including flavonoids. Inspect dried tea to ensure it's made from flower heads rather than leaves and stems (31, 33).

To make this pleasant, slightly sweet tea, pour 1 cup (240 ml) of boiled water over 1 tablespoon (2–3 grams) of dried chamomile (or 1 tea bag) and steep for 10 minutes.

Summary

In traditional medicine, chamomile has been used for indigestion, gas, and nausea. Preliminary studies suggest that the herb may fight ulcers and abdominal pain, but human studies are needed.

8. Angelica Root

This tea is made from roots of the Angelica archangelica plant, a member of the celery family. The herb has a bitter flavor but tastes better when steeped with lemon balm tea.

Angelica root extract is used in Iberogast and other herbal digestive products. The herb's bitter components may stimulate digestive juices to promote healthy digestion (34).

Additionally, animal and test-tube research notes that angelica root may relieve constipation, which is a culprit in bloating (34, 35).

Overall, more human research with this root is needed.

Some sources claim that angelica root shouldn't be used during pregnancy, as there isn't enough information on its safety. You should always consult your doctor before using any herb during pregnancy or while breastfeeding to ensure proper care (35).

A typical serving of angelica tea is 1 teaspoon (2.5 grams) of the dried root per cup (240 ml) of boiled water. Steep for 5 minutes.

Summary

Angelica root contains bitter compounds that may stimulate the release of digestive juices. Human studies are needed to confirm whether its tea has anti-bloating benefits.

The Bottom Line

Traditional medicine suggests that several herbal teas may reduce abdominal bloating and relieve digestive upset.

For example, peppermint, lemon balm, and wormwood are used in digestive products that have shown preliminary benefits against bloating. Still, human studies are needed on individual teas themselves.

That said, herbal tea is a simple, natural remedy you can try for bloating and other digestive issues.

Reposted with permission from our media associate Healthline.