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排序方式： 共有603条查询结果，搜索用时 15 毫秒
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El Jaoudi R Mamouch F Ait El Cadi M Bousliman Y Cherrah Y Bouklouze A 《Bulletin of environmental contamination and toxicology》2012,89(2):390-394
This study aimed to analyze the fluoride concentration in tap drinking water in different cities of Morocco using an electrochemical
ion-selective method. Three samples were collected from each thirteen selected cities in the period between March and May
2011. The median value of fluoride was 0.94 mg/L (0.21–2.97). High fluoride concentrations (>0.8 mg/L) were found in sixteen
cities. Very high values were found in phosphate regions such as Khouribga which is known to be an endemic dental fluorosis
area. This study has shown that the concentration of fluoride in drinking water exceeds the limit especially in phosphate
regions. 相似文献
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Aymen S. Abu Hatab Yahia H. Ahmad Mohd B. Abdul Rahman Siham Y. Al-Qaradawi 《RSC advances》2022,12(3):1694
Oxygen evolution reaction (OER) has arisen as an outstanding technology for energy generation, conversion, and storage. Herein, we investigated the synthesis of nickel-based hybrid metal oxides (NixM1−xOy) and their catalytic performance towards OER. NixM1−xOy catalysts were synthesized by solution combustion synthesis (SCS) using the metal nitrates as oxidizer and glycine as fuel. Scanning electron microscope (SEM) micrographs display a porous morphology for the hybrid binary NixM1−xOy, the common feature of combusted materials. X-ray diffraction (XRD) of NixM1−xOy depicted well-defined diffraction peaks, which confirms the crystalline nature of synthesized catalysts. The particle size of as-synthesized materials ranges between 20 and 30 nm with a mesoporous nature as revealed by N2-physisorption. The electrocatalytic performance of the as-prepared materials was evaluated towards OER in alkaline medium. Among them, NixCo1−xOy showed the best catalytic performance. For instance, it exhibited the lowest overpotential at a current density of 10 mA cm−2 (404 mV), onset potential (1.605 V), and Tafel slope (52.7 mV dec−1). The enhanced electrocatalytic performance of NixCo1−xOy was attributed to the synergism between cobalt and nickel and the alteration of the electronic structure of nickel. Also, NixCo1−xOy afforded the highest Ni3+/Ni2+ when compared to other electrocatalysts. This leads to higher oxidation states of Ni species, which promote and improve the electrocatalytic activity.Ni-based mixed transition metal oxides (MTMO) (NixM1−xOy) were synthesized using the solution combustion synthesis (SCS), and investigated as electrocatalysts towards oxygen evolution reaction (OER) in alkaline medium. 相似文献
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Mohammed Alnajjar Yahia Z. Imam Naveed Akhtar Elmukhtar Habas Ayman Zakaria 《Clinical Case Reports》2022,10(2)
Carotid web has been identified as one of the missed causes of recurrent stroke. The diagnosis and management of such cases impose a challenge to medical practitioners. This etiology should be kept in mind, especially in case of recurrence of stroke in a similar cerebral territory. 相似文献
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