http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Ayanda, Omolola T. (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Use of Mobile Phones and Cancer Risk
Ayanda, Olushola S.,Baba, Alafara A.,Ayanda, Omolola T. Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.1
Mobile phones work by transmitting and receiving radio frequency microwave radiation. The radio frequency (RF) emitted by mobile phones is stronger than FM radio signal which are known to cause cancer. Though research and evidence available on the risk of cancer by mobile phones does not provide a clear and direct support that mobile phones cause cancers. Evidence does not also support an association between exposure to radio frequency and microwave radiation from mobile phones and direct effects on health. It is however clear that lack of available evidence of cancer as regards the use of mobile phone should not be interpreted as proof of absence of cancer risk, so that excessive use of mobile phones should be taken very seriously and with caution to prevent cancer.
-
Adetunji Ajibola Awe,Beatrice Olutoyin Opeolu,Olalekan Siyanbola Fatoki,Olushola Sunday Ayanda,Vanessa Angela Jackson,Reinette Snyman 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.1
The adsorption of phenanthrene onto activated carbons produced from Vitis vinifera leaf litter (a waste plant biomass) was investigated in this study. Zinc chloride ( ZnCl2) and phosphoric acid ( H3PO4) were utilised as activating agents in producing the activated carbons. The characterisation of the activated carbons was achieved with Fourier transform infrared spectroscopy (for surface functional groups), scanning electron microscopy (for surface morphology) and Brunauer–Emmett–Teller (BET) (for surface area determination). The adsorption of phenanthrene onto the activated carbons was optimised in terms of solution pH, adsorbent dosage, initial concentration of adsorbate solution and contact time. Experimental results showed that H3PO4 modified activated carbon gave better yield (up to 58.40%) relative to ZnCl2 modified activated carbon (only up to 47.08%). Meanwhile, surface characterisation showed that ZnCl2 modification resulted in higher BET surface area (up to 616.60 m2/ g) and total pore volume (up to 0.289 cm3/g) relative to BET surface area of up to 295.49 m2/ g and total pore volume of up to 0.185 cm3/g obtained from H3PO4 modified activated carbons. Adsorption equilibrium data fitted well into Freundlich isotherm model relative to other applied isotherm models, with maximum Kf value of 1.27 for ZnCl2 modified activated carbon and 1.16 Kf value for H3PO4 modified activated carbon. The maximum adsorption capacity for ZnCl2 and H3PO4 activated carbons for the removal of phenanthrene were 94.12 and 89.13 mg/g, respectively. Kinetic studies revealed that dynamic equilibrium was reached at 80 min contact time. Experimental data fitted best into the Elovich kinetic model relative to other kinetic models, based on the correlation coefficient (R2) values obtained from kinetic studies. Chemisorption was deduced as a major phenanthrene removal pathway from aqueous solution and the physicochemical characteristics of the adsorbents have major influence on phenanthrene removal efficiencies.
-
Osayomi Tolulope,Adeleke Richard,Taiwo Olalekan John,Gbadegesin Adeniyi S.,Fatayo Opeyemi Caleb,Akpoterai Lawrence Enejeta,Ayanda Joy Temitope,Moyin-Jesu Judah,Isioye Abdullahi 대한공간정보학회 2021 Spatial Information Research Vol.29 No.4
Nigeria is currently the worst COVID-19 affected country in West Africa in terms of morbidity and mortality amid ECOWAS’s recent proclamation of the country as the region’s COVID-19 Response Champion. It is against this background that this paper analysed the geographical distribution of confirmed COVID-19 cases and fatalities in West Africa, with a view to understanding why Nigeria is at the heart of the pandemic in the subcontinent. The research relied on COVID-19 data and other health, demographic, transport, economic indicators from published sources. Pearson correlation technique and simple linear regressions were useful in discerning associations between COVID-19 and explanatory factors in West Africa. In order of importance, Nigeria, Ghana and Senegal were the top three on the morbidity list while Nigeria, Mali and Niger had the largest number of fatalities as at June 11, 2020. Results show that the population size and air traffic had significant impact on both COVID-19 morbidity and mortality in West Africa. In addition, Nigeria’s large population size and high air traffic volume did not only increase its susceptibility to the viral infection but also accounted for its being an outlier in the sub-continent. The study recommends that a cautious and gradual reopening of the borders should be considered by member states of the sub-region while behavioural avoidance measures are being enforced till a vaccine is found.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
