Tuesday, 2 June 2015

[www.keralites.net] Chinese chequers

 

Navy Alert to Chinese Nuclear Submarine Threat in Indian Ocean
 
Written by Vishnu Som 
Source: NDTV.com
A handout photo provided by the Chinese Navy shows Shang class fast attack nuclear submarine
New Delhi: Convinced that the presence of a Chinese nuclear powered attack submarine in the Indian Ocean in the last few months is part of a carefully choreographed exercise to expand its military presence in the region, senior Navy Officers have told NDTV that they don't accept the assertion that China's submarine deployment has been in aid of the anti-piracy mission off the coast of Somalia.
Navy Sources have told NDTV that while no Chinese nuclear submarine has been actively tracked trying to probe India's territorial waters, there is a recognition that a great game of submarine subterfuge, a feature of the Cold War, may now be breaking out in the Indian Ocean.
A key player in this new submarine game is China's new Type 093 Shang class fast attack nuclear submarine at least 6 of which have either been built or deployed. While not confirming whether they had profiled the noise generated by the submarine, known to be the most advanced of its class in China, Navy sources said they were impressed with the endurance of the submarine which was positioned for three months in the Indian Ocean.
They are not, however, convinced that the submarine is as silent as the latest generation of American Los Angeles Class nuclear fast attack submarines, considered by Naval analysts as a benchmark in silent operations. Reducing the sound generated underwater by submarines, whether they are nuclear or conventionally powered, is key in ensuring their survival, in an era where sonar technology and sound processing software has developed exponentially.
Keen to move beyond reports highlighting the loss of INS Sindhurakshak, a Navy Kilo Class submarine in which 18 officers and sailors were killed in an accident in 2013, and an accident onboard another submarine, the INS Sindhuratna, in which 2 officers were killed last year, the Navy is keen to point out that its remaining fleet of 14 Indian attack submarines remains extremely capable.  
All 9 remaining Kilo Class submarines acquired from the Soviet Union in the eighties have been upgraded to fire Russian Klub anti-ship and land-attack missiles and have mostly been upgraded with the indigenous DRDO-designed USHUS sonar, which the Navy describes as being extremely capable.  
Its fleet of four German-designed HDW-1500 submarines, also acquired in the eighties, have all been upgraded with the Atlas-Elektronik CSU-9014 sonar and ISUS-90 weapon control system and are in the process of being integrated with US supplied Boeing Harpoon anti-ship missiles.  
And contrary to reports that the INS Chakra, a Russian built Akula-II nuclear attack submarine was essentially meant to defend India's indigenous ballistic missile submarine, the INS Arihant, Navy sources indicate that the Chakra is deployed in open-water operations when required.
The Indian Navy has closely tracked China's interests in the Indian Ocean since 2008 when Beijing deployed in the region to fight piracy off the Horn of Africa. Last year, a Chinese Song class diesel-electric submarine flanked by a destroyer, had docked for a few days at a Chinese-owned container terminal in Colombo. This was followed by the deployment of the relatively advanced Shang Class nuclear fast attack boat, a significant cause of concern at Naval Headquarters. The Shang class submarine is thought to have returned to its home base since this Indian Ocean deployment.  
The Indian Navy has also noted the deployment of a submarine tender deep in the South Indian Ocean as part of search operations for MH-370, the missing Malaysian jetliner. The presence of this vessel suggests the deployment of a Chinese nuclear submarine far from its shores, something which has not been the norm for China's submarine fleet in the past which has typically operated well within the range of ships and aircraft operating from land bases.
India is not known to have operated its own submarines in the South China seas where New Delhi has commercial interests in oil and gas in association with Vietnam, one of the countries involved in a heated maritime dispute with Beijing. Vietnam, incidentally, has extremely close Naval links with India which is known to have trained Vietnamese sailors.  
In 2011, INS Airavat, an Indian amphibious assault ship was challenged by the Chinese Navy at a distance of 45 nautical miles from the Vietnamese coast in the South China Sea by a caller identifying himself as Chinese Navy. The Airavat continued on course ignoring the challenge which said, "you are entering Chinese waters."
India continues to maintain a robust Naval presence in South Asia where it is engaged in several bilateral and multilateral engagements. In fact, as part of the India's 'Look East' and 'Act East' policy, an Indian fleet commanded by a Rear Admiral is presently on an operational deployment in Southeast Asia and the Southern Indian Ocean.
The ships, including the stealth frigate INS Satpura, the anti-submarine corvette INS Kamorta, the guided missile destroyer INS Ranvir and the fleet tanker INS Shakti have visited Singapore and Jakarta.  Some of the ships will also be making port calls to Freemantle (Australia), Kuantan (Malaysia), Sattahip (Thailand) and Sihanoukville in Cambodia.
 

 
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[www.keralites.net] : A Guide to Hypertension [ B. P. ]

 

Hypertension is another name for high blood pressure. It might seem confusing at first, but this condition is relatively easy to treat and highly manageable. This article will explain what the condition is, look at some of the associated lifestyle factors and then describe the treatments available.

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What is Blood Pressure?

As blood flows through your body, it applies pressure to your artery walls. When the pressure is too high, the heart has to work harder and your arteries can become damaged. This condition usually becomes more common as you age. 

Symptoms
 

Many people don't even know they have high blood pressure because there are no outward symptoms. If untreated this condition can quietly damage the heart, lungs, blood vessels, brain, and kidneys, earning the condition the name "silent killer".  When you have high blood pressure the risk for heart disease, kidney disease, and stroke increase.

How to tell if you have high blood pressure

The best way to know if you you are at risk is by having your blood pressure read. The normal rate is 120/80. The top rate is called the systolic pressure and measures the pressure when your heart beats. The lower number is called the diastolic pressure, and this measures the pressure between heartbeats when your heart refills with blood.

Hypertension has no known cause. People with hypertension have a reading that averages 140/90 or higher. If your reading is between 120-139 and 80-89, for systolic and diastolic pressure respectively, you might have a condition called prehypertension. This range increases your risk of developing heart disease. To lower your reading doctors will recommend lifestyle changes.

People with a reading of 180/110 or higher may have hypertensive crisis and might experience anxiety, nosebleeds, shortness of breath and a severe headache. This condition can lead to a stroke, heart attack, kidney damage, or loss of consciousness. Seek medical attention.

Hypertension affects more men and women equally as they age. Men are more likely to develop hypertension before the age of 45, and more women will develop hypertension by the time they are 65. Your risk for hypertension is higher if you have a family member who has high blood pressure, or if you have diabetes. 

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Risk Factors

Sodium: Found in salt, sodium causes the body to retain fluid, and can put a strain on the heart, leading to increased blood pressure. Processed foods such as canned soups and cold cuts contain a lot of sodium. The American Heart Association advises eating less than 1,500 milligrams of sodium per day.

Stress: While stress can make your blood pressure go up, there's no evidence that it relates to blood pressure as a chronic condition. Stress, however, may indirectly cause hypertension because it increases the risk for heart disease. Stress is also likely to lead to other unhealthy habits like poor diet, smoking, or drinking alcohol.

Weight: When you are overweight or carry a few extra pounds, you strain your heart more and this increases your risk for hypertension. Customized diets for lowering blood pressure often involve limiting calorie intake, reducing fatty foods and added sugars, while increasing lean protein, fiber, fruits, and vegetables.

Alcohol: Drinking alcoholic beverages can also increase blood pressure. The American Heart Association recommends that men limit their drinks to 2 drinks* per day, while women reduce it to one.

*definition of a drink: a 12 oz. beer (355 ml), a 4 oz. glass of wine (118ml), a 1.5 oz. of 80-proof spirits (44ml of 40% alcohol), and 1 oz. of 100-proof spirits (30ml of 50% alcohol).

Caffeine: This has a temporary effect on blood pressure and studies have not found a link between hypertension and caffeine. Regardless, the America Heart Association recommends only one or two cups a day.

Medications: Several medications can cause blood pressure to rise, such as decongestants, steroids, birth control, NSAID pain killers, and certain anti-depressants.

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Treatments

Diet: There are several ways to lower blood pressure. A change in diet is one such way. The Dietary Approaches to Stop Hypertension or DASH diet was designed to do so. It focuses on increasing fruits, vegetables, whole-grain foods, low-fat dairy, fish, poultry, and nuts consumed and avoiding red meats, saturated fats, and sugars.

Exercise: Another way to combat high blood pressure is through exercise. Doctors advise at least 150 minutes of moderate intensity exercise per week and at least two muscle strengthening activities per week. Activities such as brisk walking, gardening, cycling and aerobic classes are recommended.

Diuretics: An alternative way to lower blood pressure are through diuretics, also called water pills. These help the body get rid of excess water and sodium. The side effect of these is that you will be urinating more than usual.

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Beta-blockers: A way to help slow down your heart beat, beta-blockers can help with hypertension by easing your heart's heavy workload. This is often a treatment for arrhythmia, which is an abnormal heart rate. This treatment for hypertension is often prescribed along with other medications.

  • Side effects: insomnia, dizziness, fatigue, cold hands and feet, and erectile dysfunction
     

ACE Inhibitors and Angiotension Receptor Blockers: Taking ACE inhibitors (angiotensin - converting - enzyme) can give your heart an easier time because they reduce the body's supply of angiotensin II. This is a chemical that causes your blood vessels to contract and narrow. With less angiotensin II, you will have more relaxed and open arteries, thus reducing your blood pressure rate. Similarly, you can take pills to block the receptors for  angiotensin II. These pills can take several weeks to be effective.

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  • Side effects of ACE inhibitors: dry cough, skin rash, or dizziness, and high levels of potassium.
     
  • Side effects of Angiotensin II block receptors: dizziness, muscle cramps, insomnia, and high levels of potassium.
     

Calcium Channel Blockers: Another part of the body, you could block to fight hypertension is your calcium channel. Calcium causes your heart to contract strongly. Blockers slow the movement of calcium in your blood vessels and heart cells, resulting in your heart being contracted more gently and more relaxed blood. These pills need to be taken with milk or food, and you should avoid alcohol and grapefruit juice because they have possible interactions.

  • Calcium channel blockers side effects: dizziness, heart palpitations, swelling of the ankles, and constipation.
     

Medications and Complementary Therapies: Your doctor might suggest other blood pressure medications such as vasodilators, alpha blockers, and central agonists. Along with lifestyle changes, doctors also might recommend complementary therapies such as meditation, yoga, tai chi and deep breathing. These relaxation techniques can allow your body to enter a state of deep rest, and lower blood pressure.  Herbal therapies are not recommended because they often interfere with blood pressure medication.


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[www.keralites.net] Friendship

 

The 3 Little Words that Say it All...

Nothing beats a true friend who stands by your side, in good times and in bad, that loves you just the way you are and supports you when things look bleak. There are three little words you need to say to strengthen any relationship, and turn it into true friendship. If you got this from someone, it means you have a true friend who will be there for you to tell you these three little words…
 
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