АвтоАвтоматизацияАрхитектураАстрономияАудитБиологияБухгалтерияВоенное делоГенетикаГеографияГеологияГосударствоДомДругоеЖурналистика и СМИИзобретательствоИностранные языкиИнформатикаИскусствоИсторияКомпьютерыКулинарияКультураЛексикологияЛитератураЛогикаМаркетингМатематикаМашиностроениеМедицинаМенеджментМеталлы и СваркаМеханикаМузыкаНаселениеОбразованиеОхрана безопасности жизниОхрана ТрудаПедагогикаПолитикаПравоПриборостроениеПрограммированиеПроизводствоПромышленностьПсихологияРадиоРегилияСвязьСоциологияСпортСтандартизацияСтроительствоТехнологииТорговляТуризмФизикаФизиологияФилософияФинансыХимияХозяйствоЦеннообразованиеЧерчениеЭкологияЭконометрикаЭкономикаЭлектроникаЮриспунденкция

Brighter Light Better Water

Читайте также:
  1. Belightair
  2. Belightair
  3. Boney M’78 – Nightflight To Venus – Atlantic – UK – 2500 (gfc, poster)
  4. Chapter VIII - Try a drop of water
  5. Deep water fish
  6. Figure 3: Percentage of the population with access to drinking water
  7. Final Fantasy: The 4 Heroes of Light
  8. Foreign Visitors to Water Museum Stunned (ошеломлены) by Russian Wastefulness
  9. From the History of Water Supply and Water Disposal
  10. Hell and High Water
  11. Hyacinth Cleans Waste Water

While most people in the developed world have safe drinking water continuously supplied to their homes, more than half of the world’s population is exposed (подвергать опасности) to water contaminated (заражать) with pathogenic organisms.

Environmental physicist Ashok Gadgil and colleagues at Lawrence Berkeley National Laboratory are working to develop a simple and effective device that can greatly reduce (уменьшать) people’s risk of becoming infected through the water they drink. The device, named UV Waterworks, is a grocery bag-sized stainless steel box containing a low-pressure mercury vapor lamp like those used in fluorescent lighting found in most office buildings.

The simplicity of the device is one of its strongest attributes. Because its major components are common and inexpensive, UV Waterworks is cheap to build and easy to maintain. The UV lamp, which will burn for about 8,000 hours, must be replaced yearly, but otherwise the device requires almost no maintenance. Water flows through the device by gravity, and electricity is used only to generate the UV light. With a total power demand of just 40 watts, UV Waterworks can operate connected to a car battery or a 2 m2 photovoltaic panel, and can disinfect 15 liters (4 gallons) of water per minute. Water Health International, the company that will manufacture UV Waterworks, estimates that when used to supply a community (община) of 1,500 – 2,000 people, the total cost of disinfected drinking water would be about fifteen cents per person annually. This makes it affordable even by developing world standards.

From “Innovations”

VII. Outline the advantages of a new device in your answer, using the expressions:

1. The author of a new device is ….

2. The name of this device is ….

3. The device is ….

4. It is … to build and … to maintain.

5. It consists of ….

6. The WHI estimates that ….

 

VIII. Read the text “Hyacinth Cleans Waste Water” and match these titles with the paragraphs:

Some words from the history

New project appeared

Waste water clearing with the help of water hyacinth

How it works

The efficiency of purification


1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |

Поиск по сайту:



Все материалы представленные на сайте исключительно с целью ознакомления читателями и не преследуют коммерческих целей или нарушение авторских прав. Студалл.Орг (0.003 сек.)