General knowledge

02/07/2021

What is Biomass and How is it used?

Biomass is plant or animal material used as fuel to produce electricity or heat. Examples are wood, energy crops and waste from forests, yards, or farms. Since biomass technically can be used as a fuel directly, some people use the terms biomass and biofuel interchangeably.

Biomass can generate electricity in a number of ways but the most common is ‘direct combustion’. This means burning the agricultural waste or wood to heat water. This produces steam, which spins turbines. Biofuels are basically fuels that are made out of biomass. These can be solid, liquid, or gas. Biodiesel and bioethanol are two of the most common types of biofuel.

Technically, Biomass Energy was discovered back in our cave-dwelling days, when we realised that wood could burn. And we’ve been at it ever since. In fact, up until the Industrial Revolution, biomass was our main source of energy (until fossil fuels came along).

06/04/2021

04/12/2020

What is Thermal Imaging and How does it Works?

Thermal Imaging is a method of using infrared radiation and thermal energy to gather information about objects, in order to formulate images of them, even in low visibility environments. It’s a type of technology that has built up a broad range of uses over the years. In particular, it’s an effective form of night-vision technology, with the capability to work in the total absence of any light (since it doesn’t rely on visible light), and can even work in smoke, fog, smog and haze. Thermal imaging is based upon the science of infrared energy (otherwise known as “heat”), which is emitted from all objects. This energy from an object is also referred to as the “heat signature”, and the quantity of radiation emitted tends to be proportional to the overall heat of the object.
Thermal cameras or thermal imagers are sophisticated devices comprised of a sensitive heat sensor with the capacity to pick up minute differences in temperature. As they gather the infrared radiation from objects in a particular environment, they can start to map out an image based on the differences and inflexions of the temperature measurements.

25/11/2020

19/11/2020

What is Artificial Leaf?

Artificial leaf, silicon-based device that uses solar energy to split hydrogen and oxygen in water, thereby producing hydrogen energy in a clean way, leaving virtually no pollutants. The technology, which was designed to simulate the natural energy-generating process of photosynthesis used by plants, was first successfully developed by American chemist Daniel G. Noceraand colleagues in 2011. Further work was needed to improve its efficiency and cost-effectiveness for practical use.
The basic component of an artificial leaf is a silicon chip that is coated in chemical catalysts, which speed up the water-splitting reaction. In an open vessel of water, when solar energy hits the chip, a chemical reaction similar to photosynthesis occurs—the hydrogen and oxygen molecules of water are split apart, resulting in the separation of protons and electrons. The protons and electrons are captured on the chip and are recombined to form hydrogen gas, which can be used for immediate generation of electricity or stored for later use.
The primary application of the artificial leaf is the clean production of hydrogen, which is considered an alternative form of energy.

18/11/2020

আইএসও ১৪ (iOS 14) অপারেটিং সিস্টেম আপডেট এনেছিল ত অনেক কিছুই! তাতে App Library, Smart stack, Picture-in-picture mode, Widgets সহ অন্যান্য অনেক ফিচার এনেছিল!
সাথে তার ভিতর এমন ও একটা ফিচার ছিল তা হল এপেলের পিছনের লোগো-তে ট্যাপ করে স্ক্রিনশট নেয়া যায়!, যাকে এক কথায় বলে Back Mode 🔥

* কিভাবে এনাবেল করবেন?
Settings > Accessibility > Touch > Back Tap > Double Tap > Screenshot এ Tap করলেই এনাবেল হয়ে যাবে আপনার ব্যাক মোড 🧡

কোন কোন আইফোন গুলাতে পাবেন?
আইফোন ৮ এর পর থেকে শুরু করে আইফোন ১০-১২ সিরিজগুলাতে পাবেন এই আপডেট!

15/11/2020

"কিন্তু সেটিই শেষ কথা নয়, সেটি ট্র‍্যাজেডিও নয়। সে মহৎ কিছু করছে না, তার দারিদ্র্য যাচ্ছে না, তার অভাব মিটছে না, কিন্তু তা সত্ত্বেও সে জীবনবিমুখ হচ্ছে না। সে পালাচ্ছে না, escape করছে না। সে বাঁচতে চাইছে। সে বলছে, বাঁচার মধ্যেই সার্থকতা, তার মধ্যেই আনন্দ, He wants to live!"

The end of an era. 💔

বাংলা সাহিত্যের এবং মুভিতে কবিতা আবৃত্তিতে অনেক কিছু শিখার মত কন্টেন্ট রেখে গেলেন তিনি।

08/11/2020

সংযুক্ত আরব আমিরাতের নতুন আইন অনুযায়ী লিভ টুগেদার এবং মদ্যপানকে বৈধ করা হয়েছে।

DUBAI, United Arab Emirates (AP) — The United Arab Emirates announced on Saturday a major overhaul of the country’s Islamic personal laws, allowing unmarried couples to cohabitate, loosening...

02/11/2020

What is use of Calcium Carbide in fruits?

Ripening is a process in fruits that causes them to become more palatable. In general, fruit becomes sweeter, less green (typically "redder"), and softer as it ripens.
Ripening agents accelerate ripening. An important ripening agent is ethylene, a gaseous hormone produced by many plants. Many synthetic analogues of ethylene are available They allow many fruits to be picked prior to full ripening, which is useful since ripened fruits do not ship well. For example, bananas are picked when green and artificially ripened after shipment by being exposed to ethylene.
Calcium carbide is also used in some countries for artificially ripening fruit. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is similar in its effects to the natural ripening agent, ethylene. Acetylene accelerates the ripening process. Catalytic generators are used to produce ethylene gas simply and safely. Ethylene sensors can be used to precisely control the amount of gas. Covered fruit ripening bowls or bags are commercially available. These containers increase the amount of ethylene and carbon dioxide gases around the fruit, which promotes ripening.
Ripening indicators like Iodine (I) can be used to determine whether fruits are ripening or rotting by showing whether the starch in the fruit has turned into sugar. For example, a drop of iodine on a slightly rotten part (not the skin) of an apple will stay yellow or orange, since starch is no longer present. If the iodine is applied and takes 2–3 seconds to turn dark blue or black, then the process of ripening has begun but is not yet complete. If the iodine becomes black immediately, then most of the starch is still present at high concentrations in the sample, and hence the fruit hasn't fully started to ripen.