Harris Chisangano is a Zambian based philosopher, International researcher, educator and speaker
I like using science as an instrument to explain life and existence. I am a book writer and motivational speak
This work investigates the impact of climate change as a threat to agriculture globally.
Climate change also called global warming refers to a rise in average surface temperature on earth. An overwhelming scientific consensus maintains that climate change is primarily due to the human use of fossil fuels which releases Carbon Dioxide and other greenhouse gases into the air. The gasses trap heat within the atmosphere which can have a range of effects on the ecosystem including rising the sea levels, severe weather events, droughts that hinder landscapes, more susceptible to wildfires. The primary cause of climate change is the burning of fossil fuels such as oil and coal which emit greenhouse gases into the atmosphere, primarily carbon dioxide. Other human activities such as agriculture and deforestation also contribute to the purification of greenhouse gases that cause climate change. There is a lot of evidence that tells us the average temperature of the world’s atmosphere and that oceans temperatures have increased over the last 150 years. These evidences include the following: • Direct temperature measurements on land • Change in the dates when lakes and rivers freeze and the ice melts • A reduction in the extent of snow core in the northern hemisphere • A reduction in glaciers • Extended growing seasons of plants • Changes in heat stored in the ocean • Changes in rainfall patterns resulting in more floods, droughts and intense rain A number of biological changes have also been observed and these include: • Shifts in the ranges of some plants and animals species • Earlier tying of spring events such as leaf unfolding, bird migration and egg laying for some species. Together, these indicators provide clear evidence that the climate is changing.
Abstract: In this study, Sr-doped lanthanum manganite perovskites (La1-xSrxMnO3, LSM) as electrode materials for supercapacitors were prepared via an improved sol-gel method. Among LSM, the x = 0.15 sample shows superior electrochemical performance, delivering the highest specific capacitance of 102 F g(-1) at a current density of 1 A g(-1) and lower intrinsic resistance in 1 M KOH. The effective charge storage of LSM is due to the redox reaction of the anion intercalation corresponding to the surface redox processes of Mn(2+)/Mn(3+) and Mn(3+)/Mn(4+) occurring within the electroactive materials. The maximum energy density of 3.6 W h kg(-1) was achieved at a power density of 120 W kg(-1) for the symmetric supercapacitor with a long cycling life after 5000 charging and discharging cycles. With the increase of cycle times, the element leaching phenomenon leads to the decrease of electrochemical performance. Our work indicated that the perovskite manganite La0.85Sr0.15MnO3 shows potential applications in the field of pseudocapacitance electrode materials and is worthy of further investigation.
Pub.: 29 Sep '17, Pinned: 13 Oct '17
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