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Someday, shadows and light could team up to provide power. A new device exploits the contrast between bright spots and shade to create a current that can power small electronics. “We can harvest energy anywhere on Earth, not just open spaces,” says Swee Ching Tan, a materials scientist at the National University of Singapore. Tan and his team created the device, called a shadow-effect energy generator, by placing a superthin coating of gold on silicon, a typical solar cell material. Like in a solar cell, light shining on silicon energizes its electrons. With the gold layer, the shadow-effect energy generator produces an electric current when part of the device lies in shadow. The excited electrons jump from the silicon to the gold. With part of the device shaded, the voltage of the illuminated metal increases relative to the dark area and electrons in the generator flow from high to low voltage. Sending them through an external circuit creates a current that can power a gadget, Tan’s team reports April 15 in Energy & Environmental Science. With eight generators, the team ran an electronic watch in low light. The devices can also serve as sensors. When a remote-controlled car passed by, its shadow fell on a generator, creating the electricity to light up an LED. The greater the contrast between light and dark, the more energy the generator provides. So the team is working to boost the device’s performance by borrowing strategies from solar cells for gathering light. Increasing the light these generators absorb would allow them to better exploit shadows. Someday, these generators might produce energy in the shadowy spots in a solar array, between skyscrapers or even indoors. “A lot of people think that shadows are useless,” Tan says. But “anything can be useful, even shadows.” Source: sciencenews.org पहिलो एक साताको लकडाउनमा सर्वसाधारणको हिडडुँल र बाहिरी गतिविधि नरोकिएको र यसबीचमा कोरोना भाइरस कोभिड १९ संक्रमित व्यक्ति थपिएपछि सरकारले लकडाउन अवधि थप्ने निश्चित भएको छ । कोभिड १९ संक्रमण रोकथाम तथा नियन्त्रण उच्च स्तरीय […] The skull is made out of two arrangements of bones cranial and facial. Cranial bones are 8 in number, facial bones are 14. Thus, the skull is made of all-out 22 bones. The cranial bones […] PathshalaNepal.com is a Registered Company of E. Pathshala Pvt Ltd Nepal. Registration number : 289280 All right Reversed. Pathshala Pvt Ltd We have detected that you are using extensions to block ads. Please support us by disabling these ads blocker.
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देशमा नयाँ १ सय ६६ जनामा कोरोना संक्रमण फेला परेको छ । जसमा १ सय ६२ जना पुरुष र ४ जना महिला रहेका छन् । यो संगै देशभर कुल कोरोना संक्रमित १५ सय ६७ पुगेको स्वास्थ्य तथा जनसंख्या मन्त्रालयका प्रवक्ता डा. विकास देवकोटाले जनाकारी दिए । जसमा १४ सय ५० पुरुष र १ सय १७ जना महिला रहेका छन् । शनिबार दैलेखमा निधन भएका ३५ बर्षिया पुरुषको मृत्यु भएकोमा उनको स्वाव परीक्षणमा पोजेटिभ भएको । बाजुराका एक बालिकाको आइतबार विहान निधन भएकोमा उनको स्वाव परीक्षण गर्दा रिपोर्ट पोजेटिभ आएको मन्त्रालयका प्रवक्ता डा. देवकोटाले जानकारी दिए । यो संगै कोरोना संक्रमणबाट देश भर निधन हुनेको संख्या ८ पुगेको उनले जानकारी दिए । त्यसैगरी पछिल्लो समय एक जना डिस्चार्ज भएसंगै कुल डिस्चार्ज हुनेको संख्या २ सय २० पुगेको छ । जसमा पुरुष १ सय ७२ पुरुष र ४८ महिला रहेका छन् । Source: NayapatrikaDaily कोरोनाभाइरसका कारण मृत्यु भएकी सिन्धुपाल्चोककी महिलाका १३ दिने शिशुसहित परिवारका चार जना सदस्यको कोरोना नेगेटिभ देखिएको छ। धुलिखेल अस्पतालमा गरिएको पिसिआर परीक्षणमा सबैको रिपोर्ट नेगेटिभ आएको अस्पतालका प्रवक्ता डा. सुमनराज ताम्राकारले जानकारी दिए। २९ वर्षीय […] The skull is made out of two arrangements of bones cranial and facial. Cranial bones are 8 in number, facial bones are 14. Thus, the skull is made of all-out 22 bones. The cranial bones […] PathshalaNepal.com is a Registered Company of E. Pathshala Pvt Ltd Nepal. Registration number : 289280 All right Reversed.E. Pathshala Pvt Ltd We have detected that you are using extensions to block ads. Please support us by disabling these ads blocker.