Daffodil International University

IT Help Desk => IT Forum => Topic started by: msu_math on November 22, 2012, 01:14:31 PM

Title: Finding GCD of Several Integers, PHP Code
Post by: msu_math on November 22, 2012, 01:14:31 PM
The  function NumGCD($A, $B) returns the greatest common divisor (GCD) of the integers contained in $A and $B. The function NumNGCD($A) calls NumGCD() repeatedly and returns GCD of several integers contained in the array $A.

function NumGCD($A, $B)
 {
   if($A==0 || $B==0) { return NULL;}
   if($A<0)  $A=-$A;
   if($B<0)  $B=-$B;
   if($A>=$B) { $bigger=$A; $smaller=$B; }
   else { $bigger=$B; $smaller=$A; }
   while(1)
      {
         $C = $bigger%$smaller; if($C==0) { $gcd=$smaller.""; return $gcd; }
         $bigger = $smaller; $smaller = $C;
     }
 }

function NumNGCD($A)
  {
        $ngcd=$A[1]; $i=1;
        while($A[$i]!=NULL)
             {
                   $ngcd=NumGCD($ngcd, $A[$i]);
                   $i++;
             }
        return $ngcd;
  }
Title: Blood Prsssure: some idea
Post by: tamim_saif on November 22, 2012, 07:00:18 PM
Blood pressure is the force of blood pushing against the wall of the arteries. Systolic pressure which is the highest blood pressure occurs when our heart is pumping. Diastolic pressure is lowest blood pressure when our heart is resting.

The unit for blood pressure is mmHg and the notation will be systolic followed by diastolic pressure. Normal blood pressure is less than 120/80mmHg. Blood pressure of 140/90mmHg is considered high blood pressure or hypertension.
Title: New source for healthy fats
Post by: tamim_saif on November 24, 2012, 12:03:08 PM
(http://www.sciencenewsforkids.org/wp-content/uploads/2011/04/Soy_1_prepped.jpg)
Soy beans (left), extracted from their pods (right), are squeezed to release heart-healthy cooking oil.

Scientists found a way to produce fish oil without harming a single fish
Title: প্রযুক্তি চশমা আনছে মাইক্রোসফট.
Post by: Mohammed Abu Faysal on November 26, 2012, 09:43:17 AM
ট্যাবলেট, স্মার্টফোনের পাশাপাশি এখন স্মার্ট গ্লাস নামের বিশেষ ধরনের এক প্রযুক্তি-চশমা তৈরির প্রতি নজর দিয়েছে বিশ্বের বৃহত্তম সফটওয়্যার নির্মাতা মাইক্রোসফট। ইতিমধ্যে যুক্তরাষ্ট্রের পেটেন্ট আদালতে স্মার্ট গ্লাসের পেটেন্ট নিবন্ধনের জন্য আবেদনও করেছে প্রতিষ্ঠানটি। এক খবরে এ তথ্য জানিয়েছে বিবিসি অনলাইন।
মাইক্রোসফট জানিয়েছে, স্মার্ট গ্লাস ব্যবহারকারী গ্লাসের কাচে প্রয়োজনীয় তথ্য দেখতে পারবেন। অর্থাত্, নতুন এ প্রযুক্তি ব্যবহার করে খেলা দেখার সময় ব্যবহারকারীরা চশমায় খেলা সংশ্লিষ্ট বিভিন্ন তথ্যও জানতে পারবেন। পাশাপাশি কোন খেলোয়াড় কোনদিকে রয়েছেন, এ চশমায় তাও দেখা যাবে।
জানা গেছে, ২০১৩ সালে মাইক্রোসফট স্মার্ট গ্লাসে ব্যবহার উপযোগী অ্যাপ্লিকেশন তৈরি শুরু করবে। বিবিসি অনলাইন জানিয়েছে, ২০১৪ সাল নাগাদ এ চশমা বাজারে আসতে পারে ।
প্রযুক্তি বিশ্লেষকেরা জানিয়েছেন, মাইক্রোসফট ছাড়াও স্মার্ট গ্লাস তৈরির কাজ করছে গুগল, ভ্যুজিক্স, এক্সপ্লোরার ইং, টিটিপিসহ বেশ কয়েকটি প্রতিষ্ঠান। তবে মাইক্রোসফট স্মার্ট গ্লাসের প্রতিদ্বন্দ্বী হবে গুগলের প্রযুক্তি চশমা। ২০১৩ সাল নাগাদ আধুনিক প্রযুক্তির এমন চশমা বাজারে আনতে পারে গুগল।

Ref: http://www.prothom-alo.com/detail/date/2012-11-25/news/308503
Title: Re: প্রযুক্তি চশমা আনছে মাইক্রোসফট.
Post by: sazirul on November 28, 2012, 08:21:56 PM
Nice information.
Thanks for Sharing.  :)
Title: Re: Finding GCD of Several Integers, PHP Code
Post by: msu_math on December 05, 2012, 06:45:18 PM
Sample codes:

<?php
$A[0] = 4; $A[1] = 6; $A[2] = 12; $A[3] = 16;
$gcd = NumNGCD($A);
echo "GCD of 4, 6, 12 and 16 is ".$gcd;
?>

Output: GCD of 4, 6, 12 and 16 is 2
Title: Simple Tips for Healthy Eyes
Post by: fernaz on March 14, 2013, 11:06:29 AM
Your eyes are an important part of your health. There are many things you can do to keep them healthy and make sure you are seeing your best. Follow these simple steps for maintaining healthy eyes well into your golden years.

Have a comprehensive dilated eye exam. You might think your vision is fine or that your eyes are healthy, but visiting your eye care professional for a comprehensive dilated eye exam is the only way to really be sure. When it comes to common vision problems, some people don’t realize they could see better with glasses or contact lenses. In addition, many common eye diseases such as glaucoma, diabetic eye disease and age-related macular degeneration often have no warning signs. A dilated eye exam is the only way to detect these diseases in their early stages.

Know your family’s eye health history. Talk to your family members about their eye health history. It’s important to know if anyone has been diagnosed with a disease or condition since many are hereditary. This will help to determine if you are at higher risk for developing an eye disease or condition.

Eat right to protect your sight. You’ve heard carrots are good for your eyes. But eating a diet rich in fruits and vegetables, particularly dark leafy greens such as spinach, kale, or collard greens is important for keeping your eyes healthy, too.i Research has also shown there are eye health benefits from eating fish high in omega-3 fatty acids, such as salmon, tuna, and halibut.

Maintain a healthy weight. Being overweight or obese increases your risk of developing diabetes and other systemic conditions, which can lead to vision loss, such as diabetic eye disease or glaucoma. If you are having trouble maintaining a healthy weight, talk to your doctor.

Wear protective eyewear. Wear protective eyewear when playing sports or doing activities around the home. Protective eyewear includes safety glasses and goggles, safety shields, and eye guards specially designed to provide the correct protection for a certain activity. Most protective eyewear lenses are made of polycarbonate, which is 10 times stronger than other plastics. Many eye care providers sell protective eyewear, as do some sporting goods stores.

Quit smoking or never start. Smoking is as bad for your eyes as it is for the rest of your body. Research has linked smoking to an increased risk of developing age-related macular degeneration, cataract, and optic nerve damage, all of which can lead to blindness.ii, iii

Be cool and wear your shades. Sunglasses are a great fashion accessory, but their most important job is to protect your eyes from the sun’s ultraviolet rays. When purchasing sunglasses, look for ones that block out 99 to 100 percent of both UV-A and UV-B radiation.

Give your eyes a rest. If you spend a lot of time at the computer or focusing on any one thing, you sometimes forget to blink and your eyes can get fatigued. Try the 20-20-20 rule: Every 20 minutes, look away about 20 feet in front of you for 20 seconds. This can help reduce eyestrain.

Clean your hands and your contact lenses—properly. To avoid the risk of infection, always wash your hands thoroughly before putting in or taking out your contact lenses. Make sure to disinfect contact lenses as instructed and replace them as appropriate.

Practice workplace eye safety. Employers are required to provide a safe work environment. When protective eyewear is required as a part of your job, make a habit of wearing the appropriate type at all times and encourage your coworkers to do the same.
[Source-Internet