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ABSTRACTUsing a two-step focused ion beam irradiation process, tilted InSb nanostructures have been fabricated using a off-normal angle of irradiation. In the first step, a well-focused ion beam was used to irradiate the surface of the structure to achieve top-down sputtering. In the second step, the ion beam was used to irradiate the entire surface to promote bottom-up nanostructure growth through the migration of ion-beam-induced interstitial atoms. The formation of a nanostructure with a 46° tilt and an aspect ratio of 0.5 was achieved using ion beam irradiation at an angle of 45° in both steps of the process. The 2% concentration of point defects obtained by changing the volume of the nanostructure before and after irradiation contributed to the growth of the structure. The results showed that many point defects did not recombine, and survived to contribute toward the growth of the wall structure. 相似文献
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Noriko Nitta Eiji Taguchi Hidehiro Yasuda Hidetaro Mori Yoshihiko Hayashi Toshimasa Yoshiie 《Philosophical Magazine Letters》2013,93(3):223-228
Secondary defects induced by ion and electron irradiation up to 6?dpa (displacements per atom) at liquid-nitrogen temperature in GaSb thin films are compared. For Sn ion (60?keV) irradiation, voids were observed. However, for high-energy electron (2?MeV) irradiation, interstitial-type dislocation loops were produced. The densities of voids and interstitial-type dislocation loops were almost equivalent (8?×?1014?voids/m2 and 3?×?1014?loops/m2) after irradiations at the same damage level of 6?dpa. It is concluded that the formation of voids by ion irradiation follows the creation of localised vacancy defects in cascade damage. 相似文献
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Samiran Hazarika 《Philosophical Magazine Letters》2016,96(4):157-164
We report on the manifestation and interconnected photoluminescence and electron paramagnetic resonance responses in gadolinium oxide (Gd2O3) nanorods subjected to 80 MeV carbon ion irradiation. On increasing the irradiation fluence between 1 × 1011 and 3 × 1012 ions/cm2, the emission associated with neutral oxygen vacancies (VOx), positioned at ~350 nm, undergoes a steady increase compared to that associated with singly charged vacancies (VO+), located at ~414 nm. The enhancement of spin–spin relaxation time (τss) is ascribed to a substantial changeover from VO+ to VOx defects with irradiation, the former being recognized as the major contributor to paramagnetic centres. Interconnected luminescence and spin–spin relaxation could provide insight for making advanced nanophosphors and spin valve elements. 相似文献
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120名在校孤儿影响学习的心理因素调查研究 总被引:5,自引:0,他引:5
本文研究120名在校孤儿影响其学习的儿项心理因素情况.录川问卷测验法和个案调查法,结果表明:孤儿的智力水平、心理健康水平低于同龄正常儿童,提高学习能力较差,问题行为较多,但在校学习方法、与教师关系较好。 相似文献
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分析冠脉支架术对患者生活质量及心理情况的影响并探讨相应策略。采用横断面研究方法,调查2007年6月-2010年9月在我院行冠脉支架术患者768例,应用Zung焦虑、SAS、SDS自评表及SF-36生活质量问卷等方法采集相关资料,200名健康人为对照1组、未行支架置入的冠心病患者为对照2组,数据行统计学分析。支架植入患者... 相似文献
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李雁飞 《医学与哲学(人文社会医学版)》2024,45(3):54-59
非法植入基因编辑、克隆胚胎罪设立后,学界存有部分反对观点认为本罪分则位置及实行行为的规定存在问题。基于解释论的立场,本罪保护法益为基因库安全、人性尊严以及公共卫生管理秩序,立法通过对形式法益的保护一并实现了对实质法益的保护,且公共卫生管理秩序是主要法益,故本罪在刑法分则中的体系位置无可厚非。因为“植入人或动物子宫”的行为是实现生殖系基因编辑或生殖性克隆目的的必经阶段,所以本罪实行行为的规定在技术层面上彻底断绝了被基因编辑、克隆的细胞发育成存活个体的机会,从而达到了对该犯罪行为规制的立法目的。
相似文献7.
The role of immiscible Cu/Mo interfaces on the formation of helium (He) bubbles in ion-irradiated Cu/Mo 5?nm multilayers is examined. Interfaces significantly enhance the critical He concentration above which bubbles, approximately 1?nm in diameter, are detected via through-focus imaging in a transmission electron microscope. He-to-vacancy ratio affects the formation and distribution of He bubbles. The diameter of He bubbles in Cu appears to be slightly larger than that in Mo. 相似文献
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New developments in flexible electronics require metal films to adhere to polymer substrates. Measuring the interfacial adhesion of these systems is challenging, requiring the formulation of new techniques and models. A strategy to measure the adhesion of Cr–polyethylene terephthalate (PET) interfaces using tensile straining and buckle formation is presented in this article. Focused ion beam cross-sectioning of the buckles reveals that the polymer substrate can locally fail, which may lead to an overestimate of adhesion. Cr–PET adhesion energy of 9.4?±?1.6?J/m2 is determined with the present approach. 相似文献
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心理学家通过采用事后提供误导信息的方法以及临床治疗中的催眠、想象等暗示性程序发现的记忆歪曲和记忆移植现象,说明记忆的改变并不局限于对经历的或记得的情节的某方面的修改,它还能创造虚假的自传性事件记忆。 相似文献