Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：当前社会环境下,微信平台的发展受到越来越多的期刊编辑部的重视。微信平台具备很多显著的优点,如:传播快捷、推送精准等,大大提升了期刊品牌影响力。在互联网时代,通过微信平台,期刊编辑部能够非常精准地推送重点文章,与用户之间实现密切的交流与互动,从而有效宣传期刊的影响力。因此,科技期刊在自身发展过程中应当重视起微信平台传播的优势,通过科学、有效的发展策略提高科技期刊的社会影响力。
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：在这个网络信息发达的时代,营销是一家企业发展壮大必不可少的因素之一。对于传统出版物来说,随着近年来出版行业市场的不景气以及网络新媒体等势力的快速崛起,如何利用好互联网进行网络营销已经成为出版行业不得不面对并且认真思考的一个重要的问题。基于此,本文首先指出了传统出版物在网络营销传播方面存在的问题,其次着重探讨了传统出版物网络营销传播的具体策略。
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-19 Cooperative journals: 《金属学报》
Abstract： Recently, La(Fe, Si)13- based magnetic refrigeration materials have been widely explored due to the advantages of giant magnetocaloric effect (MCE), tunable Curie temperature (TC), low cost of raw materials and excluding deleterious elements compared to other room-temperature giant MCE materials such as Gd5(Ge1-xSix)4, MnFeP0.45As0.55 and MnAs based compounds. In this work, in order to shift the TC to around room temperature and maintain the large MCE, the method of absorbing hydrogen was employed. La0.9Ce0.1Fe11.44Si1.56 hydride was prepared by saturated hydrogen absorption and then hydrogen contents and TC of the hydrides were controlled by subsequent dehydrogenation at different temperatures (Td=200~250 ℃ for 3 h). The phase structure and magnetocaloric effect were investigated. The results show that the samples possess the cubic NaZn13-type structure with a small amount of a-Fe as impurity phase. TC exhibits an approximately linear decrease with increasing the dehydrogenation temperature. The isothermal magnetic entropy change (ΔSm) of the hydrides decreases compared with the parent compound, which is mainly attributed to the fact that the field-induced itinerant-electron metamagnetic transition has been weakened upon hydrogen absorption. For the sample desorbed hydrogen at temperatures above 230 ℃, ΔSm is remarkably decreased and favorably the magnetic hysteresis loss has been reduced simultaneously. With further increasing the temperature to 250 ℃, ΔSm curve is broadened, weakening the characteristic of the firstorder phase transition. Due to the intrinsic brittleness of hydrides, the preparation of a certain shape is of great importance for practical application. For a magnetic field change of 1.5 T, the maximum adiabatic temperature change (ΔTad) and ΔSm for the bonded block of fully hydrogen absorption La0.9Ce0.1Fe11.44Si1.56 hydride are about 2.7 K and 7.5 J/(kg·K), respectively, which are larger than those of La(Fe, Co, Si)13 materials in the same magnetic field change range. In conclusion, the bonded La0.9Ce0.1Fe11.44Si1.56 hydrides with good MCE and different TC have been successfully prepared and will be very useful for the practical application of layered magnetic refrigerants at ambient temperature under low field change in magnetic refrigerators.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： The La0.6Pr0.4Fe11.4Si1.6B0.2 alloy was produced by using industrial grade raw materials. The phase constituents and thermal magnetic properties of the alloy were characterized by X-ray diffraction with Cu kα radiation and vibration sample magnetism respectively. The influence of hydrogen absorption pressure on magnetocaloric effect and hydrogen desorption process were investigated. Results show that the annealing treated alloy was subjected to hydrogenation at 0.13 and 0.2 MPa, correspondingly its Curie temperature increased to 320 and 321 K respectively. The taking place of dehydrogenation was much easier for the alloy hydrogenated at lower absorption pressure rather than that at higher pressure. The Curie temperature of the alloy hydrogenated at 0.13 MPa and then dehydrogenated at 473K could lower to room temperature range, correpondingly the maximal magnetic entropy of the hydrides decreased while the relative cooling power were increased.
Hits
Hits
Downloads
Comment