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在高职考试即将到来的春季,各大院校的老师在动员大会上纷纷提到了一个人:周信静。这位从职高起步的同学,在考上专科后凭自己的努力升入本科,后又考上了浙江大学的研究生,最后到美国麻省理工学院读博士,成为数据库领域图灵奖获得者迈克尔·斯通布雷克的学生。他用11年的努力,成为当之无愧的“求学逆袭王”,让职高的风吹到了麻省理工。

关键词：高职考试斯通考研职高数据库领域升本布雷克图灵奖

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2024年开学典礼,校长和老师这样说

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大学生 2024年第10期 40-44页

作者： aka(整理) 不详

又是一年开学季,精彩的校园生活正在向莘莘学子们招手。在各大高校的开学典礼上,校长和老师们将国家召唤、人生理想、学术追求、生活哲理娓道来,激励同学们将“青春逢盛世,奋斗正当时”的豪情激荡于胸,向着新目标出发。让我们一起来听... 详细信息

又是一年开学季,精彩的校园生活正在向莘莘学子们招手。在各大高校的开学典礼上,校长和老师们将国家召唤、人生理想、学术追求、生活哲理娓道来,激励同学们将“青春逢盛世,奋斗正当时”的豪情激荡于胸,向着新目标出发。让我们一起来听听他们怎么说……

关键词：开学典礼生活哲理学术追求人生理想校长校园生活各大高校老师

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Optimization of tin-Doped Hybrid Perovskite Solar Cells

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Open Journal of Applied Sciences 2024年第3期14卷 687-706页

作者： Bakary Coulibaly Abou Ahou Florentine Kokora Desiré Meledje Boko aka Bernabé Mari Soucase IREN (Institut de Recherche sur les Energies Nouvelles Abidjan Cote d’Ivoire Unité de Formation et de Recherche des Sciences Fondamentales Appliquées (UFRSFA) Universite Nangui Abrogoua Abidjan Cote d’Ivoire Laboratoire de Physiques Fondamentales Appliquées (LPFA) Université Nangui Abrogoua Abidjan Cote d’Ivoire Institut de Disseny i Fabricació Universitat Politècnica. València Spain

Perovskites are a category of materials with a unique crystal structure that allows them to absorb sunlight efficiently. this efficiency is particularly high in the case of CH3NH3Pb1-xSnxI3 mixed perovskites. the combination of lead (Pb) and tin (Sn) in this matrix provides a broad spectrum of sunlight absorption, enabling the generation of a larger voltage and, subsequently, increased power. the primary objective in solar cell development is to maximize the conversion of sunlight into electricity. Mixed perovskites like CH3NH3Pb1-xSnxI3 have demonstrated significant potential in this regard. their tunable bandgap, courtesy of varying the Pb: Sn ratio, allows for the optimization of sunlight absorption. the result is solar cells that surpass many conventional counterparts in terms of energy efficiency. Another significant advantage of these mixed perovskite solar cells is their cost-effectiveness. they can be manufactured using solution-based processes, which are less expensive than the high-vacuum methods required for traditional silicon solar cells. While the prospects for mixed perovskite solar cells are undeniably promising, there are concerns about the toxicity of lead, a key component of these cells. Lead is known to have harmful effects on the environment and health. the aim of our work is to reduce or eliminate lead toxicity in the perovskite cell while maintaining its efficiency. thus, in a theoretical and experimental approach, we obtained following efficiencies of samples: CH3NH3PbI3 (22.49%) CH3NH3Pb0.75Sn0.25I3 (22.72%), CH3NH3Pb0.5Sn0.5I3 (23.00%) CH3NH3Pb0.25Sn0.75I3 (22.61%), CH3NH3SnI3 (22.38%). Doping with 50% tin

关键词： Cost Efficiency Lead/tin Perovskite toxicity

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Preparation and Characterisation of Corncob-Based Biosorbents in Côte d’Ivoire

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Advances in Materials Physics and Chemistry 2024年第8期14卷 178-195页

作者： Miezan Gnoan Ghislaine De Bouanzi Patrick Grah Atheba Serge Kouassi Gbamélé Martin Alla aka Albert trokourey Laboratory of Constitution and Reaction of Matter (LCRM) Flix Houphout-Boigny University Abidjan Cte dIvoire Laboratory of Environmental Sciences (LSE) Nangui Abrogoua University Abidjan Cte dIvoire

this study focuses on the preparation of corncob-based biosorbents. the chemical impregnation method was used to vary the chemical agent namely phosphoric acid H3PO4 (BA) and sodium hydroxide NaOH (BB). the physicochemical analysis of the two biosorbents indicated that under the same preparation conditions, the bio-sorbents have after activation yields lower than 50% (24.37% for BB and 49.09% for BA). In addition, the biosorbents have iodine index values between 444.17 mg/g and 418.79 mg/g and specific surfaces related to the adsorption of methylene blue ranging from 18.54 m2/g to 19.70 m2/g. the study of surface functional groups by using the Boehm test and pH zero point charge (pHPZC) confirmed the acidic nature of BA and BB biosorbents with respective values pHPZC = 4.01 and pHPZC = 4.90. the Langmuir method and BEt analysis determined the specific surface areas by liquid phase adsorption of methylene blue as well as the porosity. the BEt surface areas of BA and BB obtained are 72.01 m2/g and 63.10 m2/g respectively. the influence of the chemical activating agent on the formation of pores was confirmed by electron microscopy (SEM) analysis. From this study, it is found that the best activating agent for corn cobs was found to be phosphoric acid because the BA biosorbent was revealed to be the most favourable due to its surface area and good pore volume which are high compared to sodium hydroxide NaOH. Moreover, their application as adsorbent for effluent treatment could be explored.

关键词： Biosorbent Corncobs Chemical Activation Phosphoric Acid Sodium Hydroxide

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Late Ordovician Mass Extinction: Earth, fire and ice

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National Science Review 2024年第1期11卷 51-65页

作者： David A.t.Harper Palaeoecosystems Group Department of Earth SciencesDurham University

the Late Ordovician Mass Extinction was the earliest of the ‘big’ five extinction events and the earliest to affect the trajectory of metazoan life. two phases have been identified near the start of the Hirnantian period and in the middle. It was a massive taxonomic extinction, a weak phylogenetic extinction and a relatively benign ecological extinction. A rapid cooling, triggering a major ice age that reduced the temperature of surface waters, prompted a drop in sea level of some 100 m and introduced toxic bottom waters onto the shelves. these symptoms of more fundamental planetary processes have been associated with a range of factors with an underlying driver identified as volcanicity. Volcanic eruptions, and other products, may have extended back in time to at least the Sandbian and early Katian, suggesting the extinctions were more protracted and influential than hitherto documented.

关键词： Ordovician LOME paleoecology palaeobiogeography biotas

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Preparation of microparticles and nanoparticles using membrane-assisted dispersion,micromixing,and evaporation processes

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Particuology 2024年第1期84卷 30-44页

作者： Goran t.Vladisavljevic Chemical Engineering Department Loughborough UniversityLoughboroughLeicestershire LE113TUUnited Kingdom

Synthetic microporous membranes are increasingly used for energy-efficient and controlled production of micro-and nanoparticles and micro-and nanoemulsions with tuneable morphology and physico-chemical properties through various micromixing,emulsification,and evaporation *** emul-sification processes,the membrane pores are used for dispersed phase injection and size-controlled generation of droplets and droplet-templated *** micromixing processes,membrane is utilised as a micromixer for mixing two miscible liquids,usually solvent and antisolvent-rich solutions,which leads to the creation of supersaturation and subsequent nanoprecipitation or *** mem-brane evaporation processes,membrane is used to prevent phase dispersion while allowing efficient molecular diffusion of solvent and/or antisolvent vapour through gas-filled *** dispersion processes can be operated continuously by decoupling shear stress on the membrane surface from cross flow using tube insets,flow pulsations,swirling flow,membrane oscillations or membrane *** generation and solidification can be performed continuously in a single pass by connecting membrane module with a downstream *** dispersion processes can be used for pro-duction of nanoparticles such as nanovesicles(liposomes,micelles,ethosomes,and niosomes),nanogels,polymeric,lipid and metallic nanoparticles,and *** main advantages of membrane-assisted particle generation are in low energy consumption,controlled geometry and hydrodynamic conditions at the microscale level,flexible throughput due to modular and scalable design of membrane devices,and a wide choice of available microporous membranes with various wall porosities,wetta-bilities,pore sizes,and pore morphologies to suit different applications.

关键词： Nanoparticles Microparticles Nanoemulsions Microemulsions Microporous membrane Crystallisation Flash nanoprecipitation Emulsification Zero liquid discharge

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