Results 11 to 20 of about 25,807 (183)
Journal of Adolescence, EarlyView.ABSTRACT Introduction Following rapid iterations in media technologies, Chinese millennials (born between 1980 and 1995) find themselves in a paradoxical state where digital saturation exists alongside fatigue, making them central practitioners of digital minimalist behavior.
Chao Zhang, Yinze Hao, Jingwen Li
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Garnet and LISICON-type Solid Electrolytes: Synthesis, Performance and Ionic Diffusion Dynamics [PDF]
, 2015 相对于有机液体电解液，无机固体电解质在化学与电化学稳定性方面具有无可比拟的优势，能极大提升锂离子电池安全性能及其循环稳定性，近年来成为可充锂（离子）电池研究者所关注的热点。其中，对Li4SiO4-Li3PO4（LISICON）体系的研究已经有近30年的历史，由于其较低的原料成本、较为容易的合成条件及良好的稳定性，研究者对该体系依然保持着很高的研究兴趣。Garnet型固体电解质是新兴锂离子导体，由于其具有高Li+电导率和良好的稳定性，一问世便引起工作者极大的研究兴趣 ...
王大为
core
Zhejiang Daxue xuebao. Lixue ban, 2011 通过回流法和固相法合成了隐钾锰矿型氧化锰八面体分子筛OMS-2催化剂，采用XRD、FE-SEM、O2-TPD-MS和H2-TPR等表征技术考察了分子筛催化剂的形态和表面氧的热脱附性能及还原性能，并将其应用于甲苯和甲醛的催化燃烧反应.实验结果表明，合成方法对制备的催化剂的表面性质和催化燃烧性能具有显著影响.回流法制备的催化剂对于甲苯的燃烧具有较高的活性，而固相法合成的催化剂在甲醛的燃烧中具有更好的催化活性.催化燃烧性能取决于催化剂的表面形态和氧物种的种类 ...
LINGFei(凌飞) +4 more
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Zhongguo youzhi, 2022 为比较不同修饰方法对油茶籽粕多糖抗氧化活性的影响，通过硫酸酯化、羧甲基化及乙酰化3种方法对纯化的油茶籽粕多糖(COP)进行分子修饰，以制备具有不同取代度的COP。采用体外实验法，以羟自由基(·OH)、超氧阴离子自由基（·O-2）及DPPH自由基(DPPH·)清除率为指标，探究COP及其分子修饰产物的抗氧化活性。结果表明：较低取代度的硫酸酯化修饰能提高COP对·OH、·O-2以及DPPH·的清除能力；高取代度的羧甲基化修饰能提高COP对·OH的清除能力，低取代度的羧甲基化修饰则能提高COP对DPPH ...
杨建安1，2，张超1，文焱炳2，方芳1YANG Jian′an1，2, ZHANG Chao1,WEN Yanbing2, FANG Fang1
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Tracing change in the public perception of plants: insights from archives and social media in China
PLANTS, PEOPLE, PLANET, EarlyView.As urbanization accelerates, historic gardens serve as vital cultural treasures that offer spiritual and cultural support to the public. This study proposes an innovative approach that merges historical records from the Qing Dynasty with contemporary social media data to explore changes in public perceptions of these gardens.
Dong Xu +4 more
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Wildlife Letters, EarlyView.Using radiotelemetry, we found that the movement and home range of the endangered Sacalia bealei varied significantly across reproductive classes and seasons, with males exhibiting greater movement than females during wet and mating seasons. The species exhibits strong aquatic dependence, favoring deep pools interspaced among riffle‐pool sequences ...
Wing Sing Chan +3 more
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Zhejiang Daxue xuebao. Lixue ban, 2009 以气相法二氧化硅为载体,链状胺和环胺为功能化试剂,制得一系列二氧化硅-胺基复合载体,通过配位反应得到二氧化硅负载胺-钯(II)配合物,进一步还原得到二氧化硅负载胺-钯(0)配合物.采用IR、XRD、XPS、ICP技术对配合物进行表征,并研究了配合物的制备、反应条件以及配体差异对其催化碘苯与丙烯酸的Heck反应的性能.结果表明,该类催化剂在较低的温度下(70~90 ℃)即可较好地催化该反应,生成反式产物；还原后催化剂具有更好的催化活性和良好的重复使用性能；具有链状胺基配体的催化剂随着N原子数目的增加 ...
HUGuo-hui(胡国辉) +5 more
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Human‐driven landscape change, particularly urbanization, is reshaping pollinator communities, yet the functional traits that mediate species persistence remain poorly understood. Dietary specialization is commonly used to predict species vulnerability.
Yan Yang +5 more
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Micro/Nanoelectrodes technique and Its Applications in Surface diffusion [PDF]
, 2015 “无表面扩散，则无异相催化。”——盖博·索马杰。表面扩散作为固体表面科学中的基础研究之一，在能源材料、化学工业和环境保护等许多重要领域中扮演着十分重要的角色。 虽然目前已广泛建立了多达几十种能够在超高真空或者气相环境中系统研究表面扩散的实验方法。然而在电化学体系中，对于电极表面吸附物种表面扩散行为的研究无论在实验上还是理论上都是极具挑战的。微纳电极技术为电化学领域的研究带来了更高的空间及时间分辨率，从而许多在常规尺寸电极上无法直接观测的现象却在微纳电极上显得尤为突出，例如吸附物种的表面扩散 ...
王玮
core
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Ecological communities are stressed by rapid and complex anthropogenic changes, threatening the persistence of biotic interactions and ecosystem functioning. Plant–pollinator communities, for instance, undergo structural transformations as a result of land‐use change ...
Erliang Gao +8 more
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