Tilted InSb nanostructures fabricated by off-normal ion beam irradiation

ABSTRACT

Using 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.     

Secondary defects induced by ion and electron irradiation of GaSb

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.     

Interrelated emission and spin–spin relaxation feature mediated by VO+ defects in Gd2O3 nanorods subjected to swift ion impact

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 (V_Ox), positioned at ~350 nm, undergoes a steady increase compared to that associated with singly charged vacancies (V_O⁺), located at ~414 nm. The enhancement of spin–spin relaxation time (τ_ss) is ascribed to a substantial changeover from V_O⁺ to V_Ox 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.     

120名在校孤儿影响学习的心理因素调查研究

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。     

冠脉支架术对冠心病患者心理及生活质量的影响

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...     

The influence of interfaces on the formation of bubbles in He-ion-irradiated Cu/Mo nanolayers

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.     

Interface failure and adhesion measured by focused ion beam cutting of metal–polymer interfaces

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.     

类别指称对象提取过程的发展研究

本研究选取初中二年级、高中二年级和大学二年级学生为被试,探讨了青少年对含有类别指称对象语篇心理加工过程。实验1采用命名法,实验2采用眼动记录法。结果发现,随着年级的升高,被试在单位时间内获得的信息逐渐增多,阅读能力不断提高,对类别指称概念的理解能力也不断提高;各年级被试表现出对类别指称对象激活的增强;大学生组被试还表现出对非指称对象激活的抑制;激活是立即发生的认知过程;抑制则是延缓发生的认知过程,且是一种策略性的控制加工过程。     

暗示条件下的错误记忆研究概述

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。     

注意水平对视觉工作记忆客体表征的影响

运用单探测的变化检测范式和注意分配程序,两个实验分别考察了由相同维度特征组成的客体和由不同维度特征组成的客体在工作记忆中的表征方式,以及注意对其的作用。实验1用双色框作为客体,实验2用不同颜色的形状作为客体。被试为27名大学生。结果发现,由相同维度特征组成的客体在工作记忆中只能以单一特征为储存单元,且这种储存不受注意水平的影响,可能是一种自动化的过程;由不同维度特征组成的客体在工作记忆中能以整合形式表征,但是这种表征需要集中性注意的参与。该结果表明,在知觉过程中整合起来的信息在储存到工作记忆的过程中时,仍需要消耗注意资源。