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শনিবার, 15 অক্টোবর 2011 10:16

প্রোগ্রামিংয়ের নতুন ভাষা ‘ডার্ট’2 Featured

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ডার্ট নামের একটি প্রোগ্রামিং ভাষা আনছে গুগল। জাভার বিকল্প হিসেবে ব্যবহার করা যাবে ডার্ট। গুগল কর্তৃপক্ষ জানিয়েছে, ডার্ট নামের প্রোগ্রামিং ল্যাঙ্গুয়েজ ওয়েব অ্যাপ্লিকেশন প্রোগ্রামারদের কাজে লাগবে এবং জাভায় যে ঘাটতি রয়েছে সেটি ডার্ট পূরণ করতে সক্ষম হবে।

ডার্ট-এর প্রোগ্রামার এবং প্রকল্প পরিচালক লার্স বাক ডেনমার্কে অনুষ্ঠিত গোটু কনফারেন্সে ডার্টের বিস্তারিত জানিয়েছেন।

বাক জানিয়েছেন, আমরা যদি সময়ের সঙ্গে ওয়েবকে আরো উন্নত করতে চাই, আমাদের নতুন কিছু উদ্ভাবন করতে হবে, যার মধ্যে নতুন প্রোগ্রামিং ল্যাঙ্গুয়েজও রয়েছে।

গুগল কর্তৃপক্ষ ডার্ট ল্যাঙ্গুয়েজ সাইট নামে একটি ওয়েবপেজও খুলেছে; যাতে ওপেন সোর্স টুলভিত্তিক ডার্ট প্রোগ্রাম লেখা, কোড স্যাম্পল, টিউটোরিয়াল, সফটওয়্যার লাইব্রেরিসহ ফোরাম রাখা হয়েছে।

Last modified on বুধবার, 11 ডিসেম্বর 2013 14:05

48042 comments

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    Plus, the health benefits of the spices in Curry Powder are a big bonus. Ingredients like turmeric and ginger are known for their anti-inflammatory properties, which is a great added benefit when I’m trying to eat healthier. Anyone else love Curry Powder?

    How do you use it in your cooking?

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    Understanding Engine Vibration: The Importance of Balancing Rotors


    Engine vibration is a common issue that many enthusiasts and professionals encounter in mechanical systems, particularly those involving rotors. Understanding the fundamentals of engine vibration and how to manage it is essential for ensuring the long-term effectiveness and safety of machinery.



    What is Engine Vibration?


    Engine vibration occurs when rotating components create an imbalance due to uneven mass distribution. This imbalance leads to excessive wear and tear, energy loss, and can ultimately reduce the lifespan of machinery.



    The Role of Rotors


    At the heart of many machines are rotors, which are rotating bodies held in place by bearing surfaces. These rotors must have their mass distributed symmetrically around the axis of rotation to maintain balance. Ideally, the centrifugal forces acting on the rotor's elements cancel each other out. However, when there is an asymmetry—such as a misaligned mass—the rotor experiences unbalanced centrifugal forces, leading to significant vibrations.



    Why Balancing is Key


    Balancing a rotor is a critical process used to correct any imbalances resulting in vibrations. It involves adding or adjusting masses to restore symmetry to the rotor. This balancing act can prevent the detrimental effects that vibrations can have on engine components, including bearing wear and structural fatigue.



    Types of Balancing


    There are primarily two types of balancing to address engine vibration: static and dynamic balancing. Static balancing occurs when the rotor is at rest. It identifies a "heavy point" that causes the rotor to tilt when gravity is applied. Dynamic balancing, on the other hand, is performed while the rotor is in motion and identifies imbalances that lead to vibrations when the rotor is spinning.



    Understanding Vibrations


    The vibrations in a mechanism can be triggered by various external forces, but the most significant is the centrifugal force caused by an unbalanced rotor. This force can resonate throughout the structure, leading to unwanted noise and potential failure. For this reason, engineers emphasize the importance of monitoring engine vibration levels during operations.



    Monitoring Tools and Techniques


    To effectively measure and analyze engine vibration, several tools are utilized. Vibration sensors—such as accelerometers and velocity sensors—are essential for capturing the amplitude and phase of vibrations. By accurately measuring these elements, engineers can determine the extent of engine vibration and take necessary corrective actions.



    Factors Influencing Engine Vibration


    The amplitude of engine vibration is influenced not only by the magnitude of the forces acting on the rotor but also by the physical properties of the machinery, including its mass, rigidity, and inherent damping characteristics. This insight is crucial for designing systems that minimize unwanted vibrations.



    Resonance: A Potential Hazard


    One major concern with engine vibration is the phenomenon of resonance. As the rotor spins, there might be a frequency where the rotor’s natural frequency coincides with the operational frequency, leading to dramatically increased vibration amplitudes. This could result in severe mechanical failure if not addressed.



    The Importance of Regular Balancing


    Regular maintenance and balancing of rotors are paramount for any machinery relying on rotational components. It not only helps in preventing engine vibrations but also enhances the overall longevity and efficiency of machinery. All machinery should be in good condition prior to balancing, as defects can obfuscate the balancing process and lead to further issues.



    Final Thoughts


    Engine vibration may seem like a minor issue, but its implications can be far-reaching if not managed appropriately. Understanding the mechanics of balancing rotors and the dynamics of vibrational forces enables professionals to maintain their engines efficiently and effectively. By leveraging advanced devices and techniques for monitoring engine vibration, it’s possible to enhance machinery performance, safety, and reliability.




    Article taken from https://vibromera.eu/

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