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Saturday, November 21, 2020

Covid-19, the most common word of the whole world


Coronavirus disease (COVID-19) is a communicable disease caused by a newly discovered coronavirus. Most people infected with the COVID-19 virus will experience mild to moderate respiratory disease and recover without requiring special treatment. Older people, and people with underlying medical problems like disorder , diabetes, chronic respiratory illness , and cancer are more likely to develop serious illness.

The best thanks to prevent and hamper transmission is to be informed about the COVID-19 virus, the disease it causes and the way it spreads. Protect yourself et al. from infection by washing your hands or using an alcohol based rub frequently and not touching your face.
The COVID-19 virus spreads primarily through droplets of saliva or discharge from the nose when an infected person coughs or sneezes, so it’s important that you simply also practice respiratory etiquette (for example, by coughing into a flexed elbow).

"Prevention is better than cure" is a well known saying to us. In this disease Prevention is only thing we can do as there is no vaccine yet. The ways of prevention are following:

  1.  Wash your hands regularly with soap and water, or clean them with alcohol-based hand rub.
  2.  Maintain a minimum of 1meter distance between you and other people coughing or sneezing.
  3.  Avoid touching your face.
  4.  Cover your mouth and nose when coughing or sneezing.
  5.  Stay home if you are feeling unwell.
  6.  Refrain from smoking and other activities that weaken the lungs.
  7.  Practice physical distancing by avoiding unnecessary travel and staying faraway from large groups of individuals .


COVID-19 affects different people in several ways. Most infected people will develop mild to moderate illness and recover without hospitalization.

Most common symptoms:
  1. fever.
  2. dry cough.
  3. tiredness.

Less common symptoms:
  1. aches and pains.
  2. sore throat.
  3. diarrhoea.
  4. conjunctivitis.
  5. headache.
  6. loss of taste or smell.
  7. a rash on skin, or discoloration of fingers or toes.

Serious symptoms:
  1. difficulty breathing or shortness of breath.
  2. chest pain or pressure.
  3. loss of speech or movement.

Seek immediate medical attention if you've got serious symptoms. Always call before visiting your doctor or clinic .

People with mild symptoms who are otherwise healthy should manage their symptoms reception .

On average it takes 5–6 days from when someone is infected with the virus for symptoms to point out , however it can take up to 14 days.

"করোনাভাইরাস" পুরো বিশ্বের সবচেয়ে আলোচিত শব্দ

পর্যালোচনা ঃ

 করোনাভাইরাস রোগ (COVID-19) একটি সংক্রামক রোগ যা একটি নতুন আবিষ্কৃত করোন ভাইরাস দ্বারা সৃষ্ট।

COVID-19 ভাইরাস দ্বারা সংক্রামিত বেশিরভাগ লোক হালকা থেকে মাঝারি শ্বাসযন্ত্রের রোগের অভিজ্ঞতা অর্জন করে এবং বিশেষ চিকিত্সার প্রয়োজন ছাড়াই সুস্থ হয়। বয়স্ক ব্যক্তিরা এবং অসুস্থতা, ডায়াবেটিস, দীর্ঘস্থায়ী শ্বাসযন্ত্রের অসুস্থতা এবং ক্যান্সারের মতো অন্তর্নিহিত চিকিত্সা সমস্যায় আক্রান্ত ব্যক্তিদের গুরুতর অসুস্থতার সম্ভাবনা বেশি থাকে।
COVID-19 ভাইরাস, এটি যে রোগটি সৃষ্টি করে এবং কীভাবে এটি ছড়িয়ে পড়ে তার সম্পর্কে অবহিত হওয়া ও প্রতিরোধের  সর্বোত্তম চেষ্টা করাই একমাত্র উপায়। নিজেকে রক্ষা করুন ।  ঘন ঘন হাত ধোয়া  এবং মুখ স্পর্শ না করে সংক্রমণ থেকে রক্ষা পাওয়া সম্ভব।
COVID-19 ভাইরাস সংক্রামিত ব্যক্তির কাশি বা হাঁচি হয় যখন প্রাথমিকভাবে নাক থেকে লালা বা স্রাব ফোটা মাধ্যমে ছড়িয়ে পড়ে, তাই এটি গুরুত্বপূর্ণ যে আপনি কেবল শ্বাস-প্রশ্বাসের শিষ্টাচার অনুশীলন করুন।


COVID-19 বিভিন্নভাবে বিভিন্ন লোককে প্রভাবিত করে। বেশিরভাগ সংক্রামিত ব্যক্তিদের হালকা থেকে মাঝারি অসুস্থতার বিকাশ হয় এবং হাসপাতালে ভর্তি না করেই পুনরুদ্ধার হয়।

সর্বাধিক সাধারণ লক্ষণ:

  • জ্বর.
  • শুষ্ক কাশি.
  • ক্লান্তি

কম সাধারণ লক্ষণ:
  • ব্যথা এবং ব্যথা
  • গলা ব্যথা.
  • ডায়রিয়া
  • কনজেক্টিভাইটিস
  • মাথাব্যথা
  • স্বাদ বা গন্ধ হ্রাস।
  • ত্বকে ফুসকুড়ি, বা আঙ্গুলের বা পায়ের আঙ্গুলের বর্ণহীনতা।

গুরুতর লক্ষণ:
  • শ্বাস নিতে বা শ্বাসকষ্ট হওয়া
  • বুকে ব্যথা বা চাপ
  • কথা বলা বা চলাচলের ক্ষতি।

আপনার যদি গুরুতর লক্ষণ দেখা যায় তবে অবিলম্বে বিশেষ চিকিত্সা নিন। 
হালকা লক্ষণযুক্ত হলে ঘরে বসেই চিকিৎসা নিন।

লক্ষণগুলি প্রকাশের জন্য কেউ যখন ভাইরাসে সংক্রামিত হয় তখন থেকে গড়ে ৫-– দিন সময় লাগে, তবে এটি ১৪ দিন পর্যন্ত সময় নিতে পারে।

প্রতিরোধ ঃ

সংক্রমণ রোধ করতে এবং COVID-19 সংক্রমণটি  ধীর করতে নিম্নলিখিত কাজগুলি করুন:

১। সাবান এবং পানি দিয়ে নিয়মিত হাত ধোয়া।
২। আপনার এবং অন্যান্য ব্যক্তির কাশি বা হাঁচির মধ্যে ন্যূনতম ১ মিটার দূরত্ব বজায় রাখুন।
৩। মুখ ও চোখ স্পর্শ করা এড়িয়ে চলুন।
৪। কাশি বা হাঁচির সময় আপনার মুখ এবং নাকটি ঢেকে রাখুন।
৫। আপনি যদি অসুস্থ বোধ করেন তবে বাড়িতেই থাকুন।
৬। ধূমপান এবং অন্যান্য ক্রিয়াকলাপগুলি থেকে বিরত থাকুন যা ফুসফুসকে দুর্বল করে।
৭। অযৌক্তিক ভ্রমণ এড়ানো এবং ব্যক্তিদের বিশাল দল থেকে দূরে থাকতে শারীরিক দূরত্ব অনুশীলন করুন।

Tuesday, October 13, 2020

Cast Dream : Lox wax precision casting suppliers

 Every customer's requirements are attentively analyzed in contract so you are sure your investment castings are ideally adapted to your needs. We are Cast Dream, a dedicated team that supplies professional production for precision casting. We are Cast Dream a committed team that provides professional production for precision investment casting, we are a well-known provider of investment castings. steel investment precision casting manufactory

Since investment casting exploits disposable patterns and ceramic shells, it is good for sophisticated and accurate element schemes. The operation produces intricate parts that are hard, if it is not impossible, to engine, fabricate or cast. Models include internal paths and ports in a valve body, curved vanes of an impeller and internal cooling grooves in a turbine blade. Safety furniture and procedure exercise is obligatory for all workers. Waste is treated according to government standards. We have mechanical some of our key processes and are frequently assessing and implementing automation. Cast Dream is a key player within the process business when it comes to casting precision. Cast Dream has produced many components, which are commonly cast into specific alloys. These special alloys are applied because the components frequently operate in environments that are either aggressive, subjected to large differences in temperature or commodities that required to be extremely tough, solid or light. metals precision casting equipment suppliers

Saturday, October 3, 2020

Economy of Bangladesh

 The economy of Bangladesh may be a developing free enterprise . it is the 39th largest within the world in nominal terms, and 30th largest by purchasing power parity; it's classified among subsequent Eleven emerging market middle income economies and a frontier market. within the half-moon of 2019, Bangladesh's was the world's seventh fastest growing economy with a rate of seven .3% real GDP annual growth. Dhaka and Chittagong are the principal financial centers of the country, being home to the Dhaka stock market and therefore the Chittagong stock market . The financial sector of Bangladesh is that the second largest within the Indian subcontinent. Bangladesh is one among the world's fastest growing economies.

In the decade since 2004, Bangladesh averaged a GDP growth of 6.5%, that has been largely driven by its exports of ready made garments, remittances and therefore the domestic agricultural sector. The country has pursued export-oriented industrialisation, with its key export sectors include textiles, shipbuilding, fish and seafood, jute and leather goods. it's also developed self-sufficient industries in pharmaceuticals, steel and food processing. Bangladesh's telecommunication industry has witnessed rapid climb over the years, receiving high investment from foreign companies. Bangladesh also has substantial reserves of gas and is Asia's seventh largest gas producer. Offshore exploration activities are increasing in its maritime territory within the Bay of Bengal. It also has large deposits of limestone.The government promotes the Digital Bangladesh scheme as a part of its efforts to develop the country's growing information technology sector.

As of 2019, Bangladesh's GDP per capita income is estimated as per IMF data at US$5,028 (PPP) and US$1,906 (nominal). Bangladesh may be a member of the D-8 Organization for Economic Cooperation, the South Asian Association for Regional Cooperation, the International fund , the planet Bank, the planet Trade Organization and therefore the Asian Infrastructure Investment Bank. The economy faces challenges of infrastructure bottlenecks, bureaucratic corruption, and youth unemployment.


Map showing the growing areas of major agricultural products.

Main article: Agriculture of Bangladesh

Most Bangladeshis earn their living from agriculture.Although rice and jute are the first crops, maize and vegetables are assuming greater importance. thanks to the expansion of irrigation networks, some wheat producers have switched to cultivation of maize which is employed mostly as poultry feed.Tea is grown within the northeast. due to Bangladesh's fertile soil and normally ample water system , rice are often grown and harvested 3 times a year in many areas. thanks to variety of things , Bangladesh's labour-intensive agriculture has achieved steady increases in grain production despite the usually unfavourable weather .These include better control and irrigation, a generally more efficient use of fertilisers, and therefore the establishment of higher distribution and rural credit networks. With 28.8 million metric tons produced in 2005–2006 (July–June), rice is Bangladesh's principal crop. 

Manufacturing and industry

Many new jobs – mostly for ladies – are created by the country's dynamic private ready-made apparel industry , which grew at double-digit rates through most of the 1990s.By the late 1990s, about 1.5 million people, mostly women, were employed within the garments sector also as Leather products specially Footwear (Shoe manufacturing unit). During 2001–2002, export earnings from ready-made garments reached $3,125 million, representing 52% of Bangladesh's total exports. Bangladesh has overtaken India in apparel exports in 2009, its exports stood at 2.66 billion US dollar, before India's 2.27 billion US dollar and in 2014 the export rose to $3.12 billion monthly . At the financial year 2018, Bangladesh has been ready to garner US$36.67 billion export earnings by exporting manufactured goods, of which, 83.49 percent has come from the apparel manufacturing sector.

Eastern Bengal was known for its fine muslin and silk fabric before British period. The dyes, yarn, and cloth were the envy of much of the premodern world. Bengali muslin, silk, and brocade were worn by the aristocracy of Asia and Europe. those that had earned their living within the textile industry were forced to rely more completely on farming. Only the littlest vestiges of a once-thriving industry survived.

Other industries which have shown very strong growth include the pharmaceutical industry,shipbuilding industry, information technology, leather industry, industry , and lightweight engineering industry.


Until the 1980s, the financial sector of Bangladesh was dominated by state-owned banks. With the grand-scale reform made in finance, private commercial banks were established through privatisation. subsequent finance sector reform programme was launched from 2000 to 2006 with specialise in the event of monetary institutions and adoption of risk-based regulations and supervision by Bangladesh Bank. As of date, the banking sector consisted of 4 SCBs, 4 government-owned specialized banks dealing in development financing, 39 private commercial banks, and 9 foreign commercial banks.

Information and Communication Technology

Bangladesh's information technology sector is growing example of what are often achieved after the present government's relentless effort to make a talented workforce in ICT sector. The ICT workforce consisted of personal sector and freelance skilled ICT workforce. The ICT sector also contributed to Bangladesh's economic process . The ICT adviser to the prime minister, Sajeeb Wazed Joy is hopeful that Bangladesh will become a serious player within the ICT sector within the future. within the last 3 years, Bangladesh has seen an incredible growth within the ICT sector. Bangladesh may be a market of 160 million people with vast consumer spending around mobile phones, telco and internet. Bangladesh has 80 million internet users, an estimated 9% growth in internet use by June 2017 powered by mobile internet. Bangladesh currently has a lively 23 million. Facebook users. Bangladesh currently has 143.1 million mobile customers. Bangladesh has exported $800 million worth of software, games, outsourcing and services to European countries, the us , Canada, Russia and India by 30 June 2017. The Junior Minister for ICT division of the Ministry of Post, Telecommunications and knowledge Technology said that Bangladesh aims to boost its export earnings from the knowledge and technology (ICT) sector to $5 billion by 2021.

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Greenhouse Effect

 The atmospheric phenomenon is that the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it might be without this atmosphere.

Earth's natural atmospheric phenomenon is critical to supporting life, and initially was a precursor to life moving out of the ocean ashore . Human activities, however, mainly the burning of fossil fuels and clearcutting of forests, have accelerated the atmospheric phenomenon and caused heating .

The term "greenhouse effect" continues to see use in scientific circles and the media despite being a slight misnomer, as an atmosphere reduces radiative heat loss while a greenhouse blocks convective heat loss. The result, however, is a rise in temperature in both cases.


Main article: History of climate change science

The existence of the atmospheric phenomenon , while not named intrinsically , was proposed by Joseph Fourier in 1824. The argument and therefore the evidence were further strengthened by Claude Pouillet in 1827 and 1838. John Tyndall was the primary to live the infrared absorption and emission of varied gases and vapours. From 1859 onwards, he showed that the effect was thanks to a really small proportion of the atmosphere, with the most gases having no effect, and was largely due to water vapor , though small percentages of hydrocarbons and CO2 had a big effect. However, the term "greenhouse" wasn't wont to ask this effect by any of those scientists; the term was first utilized in this manner by Nils Gustaf Ekholm in 1901.

Greenhouse gases

Main article: Greenhouse gas

By their percentage contribution to the atmospheric phenomenon on Earth the four major gases are:

Atmospheric gases only absorb some wavelengths of energy but are transparent to others. The absorption patterns of water vapour (blue peaks) and CO2 (pink peaks) overlap in some wavelengths. Carbon dioxide isn't as strong a greenhouse emission as water vapour , but it absorbs energy in longer wavelengths (12–15 micrometers) that water vapour doesn't , partially closing the "window" through which heat radiated by the surface would normally escape to space. (Illustration NASA, Robert Rohde)

water vapor, 36–70%

carbon dioxide, 9–26%

methane, 4–9%

ozone, 3–7%

It is impossible to assign a selected percentage to every gas because the absorption and emission bands of the gases overlap (hence the ranges given above). Clouds also absorb and emit infrared and thus affect the radiative properties of the atmosphere.

Role in climate change

Main article: Global warming

The Keeling Curve of atmospheric CO2 concentrations measured at Mauna Loa Observatory.

Strengthening of the atmospheric phenomenon through human activities is understood because the enhanced (or anthropogenic) atmospheric phenomenon . This increase in radiative forcing from act is attributable mainly to increased atmospheric CO2 levels. According to the 2014 Assessment Report from the Intergovernmental Panel on global climate change , "atmospheric concentrations of CO2 , methane and laughing gas are unprecedented in a minimum of the last 800,000 years. Their effects, along side those of other anthropogenic drivers, are detected throughout the climate system and are extremely likely to possess been the dominant explanation for the observed warming since the mid-20th century'".

CO2 is produced by fuel burning and other activities like cement production and tropical deforestation. 

Measurements of CO2 from the Mauna Loa observatory show that concentrations have increased from about 313 parts per million (ppm) in 1960, passing the 400 ppm milestone on May 9, 2013.[30] the present observed amount of CO2 exceeds the geological record maxima (~300 ppm) from ice core data. The effect of combustion-produced CO2 on the worldwide climate, a special case of the atmospheric phenomenon first described in 1896 by Svante Arrhenius, has also been called the Callendar effect.

Over the past 800,000 years, ice core data shows that CO2 has varied from values as low as 180 ppm to the pre-industrial level of 270 ppm. Paleoclimatologists consider variations in CO2 concentration to be a fundamental factor influencing climate variations over this point scale.

Real greenhouses

A modern Greenhouse in RHS Wisley

The "greenhouse effect" of the atmosphere is known as by analogy to greenhouses which become warmer in sunlight. However, a greenhouse isn't primarily warmed by the "greenhouse effect". "Greenhouse effect" is actually a misnomer since heating in the usual greenhouse is due to the reduction of convection, while the "greenhouse effect" works by preventing absorbed heat from leaving the structure through radiative transfer.

A greenhouse is made of any material that passes sunlight: usually glass or plastic. The sun warms the bottom and contents inside a bit like the surface , and these then warm the air. Outside, the nice and cozy air near the surface rises and mixes with cooler air aloft, keeping the temperature less than inside, where the air continues to heat up because it is confined within the greenhouse.

Heated greenhouses are yet one more matter: as they need an indoor source of heating, it's desirable to minimise the quantity of warmth leaking out by radiative cooling. This can be done through the utilization of adequate glazing.

Sunday, September 27, 2020

Fireproof Outdoor Noise Barrier for Construction Site Sound Control

 Fireproof Outdoor Noise Barrier for Construction Site Sound Control

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