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የስማርት የኤሌክትሪክ ኃይል ማሰራጫ ምንነትና ቴክኖሎጂያዊ ግብዓቶቹ

21/09/2018
ስማርት የኤሌክትሪክ ማሰራጫ (Smart Grid) ኃይል ከመመረቻው ቦታ አንስቶ በማስተላለፍ እና ተጠቃሚዎችለመሆኑ ጋር እስኪደርሰ ያለውን ሂደት ኮምፒውተራይዝድ በሆነ መልኩ ፍላጎት እና አቅምን ለማመጣጠን የሚሰራ የኤሌክትሪክ ማሰተላለፊያ መረብ ነው፡፡ ይህም ሲባል ባህላዊውን የአንድ አቅጣጫ ስርአትን በተቃረነ መልኩ ኃይል፣ መረጃ እና ቁጥጥር ተጠቃሚም ሆነ አምራች እንዲቀበል እና እንዲልክ የሚያደርግ የሁለት አቅጣጫ (Bi-directional) ስርዓትን ነው፡፡ በዚህ መንገድ ተጠቃሚዎች የኃይል አጠቃቀማቸውን እንዲቆጣጠሩ ከማስቻሉም በላይ ወጪያቸውን እና የአካባቢ ብክለትን ይቀንሳል፤ ስርአቱ አስተማማኝ እና የተረጋጋ እንዲሆን ያደርጋል፡፡

ኢትዮጵያ ከIAEA ጋር የአምስት አመት ፕሮጀክት ስምምነት ተፈራረመች

20/09/2018

ጌሪ አሜሪካ ተብሎ የሚጠራው የእህል ፈጅ ትል መድሀኒት ያገኙት እናት ወ/ሮ ታቦቴ አባተ

01/09/2018
ወ/ሮ ታቦቴ አባተ በቦኖ በደሌ ዞን አርሶ አደር ናቸው። ከችግራቸው በመነሳትም ጌሪ አሜሪካ ለተባለ ትል አዲስ የትል ማጥፊያ ፈጥረዋል።

የመጀመሪያዋ ኢትዮጵያዊት የህክምና ፕሮፌሰር

01/09/2018
የመጀመሪያዋ ሴት የህክምና ፕሮፌሰር ናቸው፡፡ በአዲስ አበባ ዩኒቨርስቲ ታሪክ ደግሞ ይህንን ማዕረግ በማግኘት የቀደሟቸው አንድ ሴት ብቻ ናቸው፡፡ በመምህርነት፣ በተማራማሪነት እና በሀኪምነት ላለፉት 33 ዓመታት እያገለገሉ ይገኛሉ፡፡ የስኳር ህመምን የተመለከተ አንድ መጽሐፍም አሳትመዋል፡፡ ፕሮፌሰር የወይንሐረግ ፈለቀ ይባላሉ፡፡

ሳይንስ እረጅናን ማቆም ይቻለው ይሆን?

01/09/2018
እርጅናን ማቆም አይቻልም ነገር ግን ለማቆም ሳይንቲስቶች እየሰሩ መሆኑን ታውቋል፡፡

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Lack of dust makes China's air pollution much worse

Lack of dust makes China's air pollution much worse

By Matt McGrath Environment correspondent

•     12 May 2017

From the section Science & Environment

 Airborne dust is normally seen as an environmental problem, but the lack of it is making air pollution over China considerably worse.

A new study suggests less dust means more solar radiation hits the land surface, which reduces wind speed.

That lack of wind in turn leads to an accumulation of air pollution over heavily populated parts of China.

The researchers found that reduced dust levels cause a 13% increase in human-made pollution in the region. Hundreds of millions of people across China continue to be impacted by air pollution from factories and coal-fired power plants.

Studies suggest that the dirty air contributes to 1.6 million deaths a year, about 17% of all mortalities. Using models to simulate 150 years of wind and dust patterns in the region, the researchers found that the dust deflects significant amounts of sunlight.

Without it, more heat from the Sun hits the land. Differences in the temperatures between land and sea cause the winds to blow. Without the dust, the land warms up more and that changes the temperature differential with the sea leading to weaker breezes - and more air pollution. "There are two dust sources. One is the Gobi and the other is the highlands of north-west China, but we found the Gobi had much more influence," said lead author Yang Yang, from the Pacific Northwest National Laboratory in Washington State, US.

"Less dust in the atmosphere causes more solar radiation to reach the surface. It weakens the temperature difference between the land and the sea and impacts the circulation of the winds and causes a stagnation over eastern China and that causes an accumulation of air pollution."

ሠMany parts of the world, in addition to China, are now suffering from increased levels of air pollution and understanding how dust, winds and emissions work together may help limit some of the worst impacts of dirty air


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