Li掺杂对ZnO陶瓷结构与电学性能的影响

研究了用传统方法在1200～1400℃烧结的ZnO陶瓷，以及用放电等离子体烧结(SPS)方法烧结的ZnO陶瓷的结构特征与电学性能。以ZnO为基添加了不同浓度的LiOH，制备了不同Li掺杂浓度的ZnO陶瓷。研究了掺杂、烧结温度，以及烧结方法等因素对ZnO基陶瓷的微观结构、电学性能的影响。实验表明，用传统方法烧结时，ZnO在烧结温度低于1400℃的情况下难以成瓷，而放电等离子体烧结(SPS)方法可以显著降低烧结温度。ZnO陶瓷的晶粒大小。密度随着烧结温度的增大而增大。在同样的烧结温度下，LiOH含量越大，ZnO基陶瓷的电阻率越大。     

高能强子在铁中的衰减

利用强子探测效率高的厚型甘巴拉山铁乳胶室,观测了能量大于4TeV强子流的衰减长度.分别对无伴随的单个强子、ΣE_γ>500TeV、100TeV≤ΣE_γ≤500TeV和30TeV≤ΣE_γ<100TeV的族事例中的强子作了测量. 初步结果表明,四种情况的衰减长度是有差异的,对此作了讨论.     

消声室的设计和性能检测

消声室是声学测量的基本配套设施。本文作者在宁波大学内建消声室实践基础上,对消声室的类型、规格和技术经济指标的确定;消声室的隔振、隔声处理;消声室的吸声处理等方面的问题进行了探讨。消声室的性能检测的一个重要内容是自由声场的鉴定,本文提出一种离散法鉴定自由声场,具有简单易行的优点。     

单室沉积高效非晶硅/微晶硅叠层太阳电池的研究

采用甚高频等离子体增强化学气相沉积技术,在前期单室沉积的微晶硅薄膜太阳电池和非晶硅/微晶硅叠层太阳电池研究的基础上,通过对微晶硅底电池本征层硅烷浓度的优化,获得了初始效率达到11.02%(电池面积1.0 cm²)的非晶硅/微晶硅叠层太阳电池.同时,100 cm²的非晶硅/微晶硅叠层太阳电池的组件效率也达到了9.04%. 关键词： 非晶硅/微晶硅叠层电池 单室 甚高频     

稳态燃烧室进气过程的大涡模拟

为精确描述燃烧室进气过程中的流场动态特性,本文应用大涡模拟模型对燃烧室稳态进气过程进行三维瞬态数值模拟研究,着重考察了三种不同亚网格模型(SGS)的性能,这三种SGS模型是:代数Smagorinsky模型、动态Smagorinsky模型和单方程动态动能输运模型(LDKEM)。计算结果表明LEDKEM模型和动态Smagorinsky模型均能较好地反映流场的瞬变性和随机性,前者性能最佳;而代数Smagorinsky模型精度较差,且不能模拟流场的微结构。     

Design of a multi-cusp ion source for proton therapy

The permanent magnets of the discharge chamber in a multi-cusp proton source are studied and designed. The three electrode extraction system is adopted and simulated. A method to extract different amounts of current while keeping the beam emittance unchanged is proposed.     

Tracer Study on Catalytic Hydrogen Exchange Reactions over Nickel Catalyst

In heterogeneous catalysis it is important to know the reactivity of C-H bond in the hydrocarbon molecules. Experiments have been performed to obtain information about the exchange reaction of adsorbed hydrogen with methane and ethylene. In order to reduce the probability of forming products which contain more than one tritium atom, hydrogen labelled with H³ with low activity has been used.     

Atomic Absorption Spectrometry of Silver with Absorption Tube Having Nebulization Chamber

In the atomic absorption spectrometry with the long absorption tube using a hydrogen-air flame, only the total consumption type of the burners, e.g., Beckman¹ or ring burners², have been used for the input of a sample solution to the flame. The use of the indirect input method with nebulization chamber has never been attempted, though, by use of a commercially available apparatus with nebulization chamber, the large increase of the sensitivity has been easily obtained by heating the chamber and nebulizing air^3–5.     

Versatile vacuum chamber for in situ surface X‐ray scattering studies

A compact portable vacuum‐compatible chamber designed for surface X‐ray scattering measurements on beamline ID01 of the European Synchrotron Radiation Facility, Grenoble, is described. The chamber is versatile and can be used for in situ investigation of various systems, such as surfaces, nanostructures, thin films etc., using a variety of X‐ray‐based techniques such as reflectivity, grazing‐incidence small‐angle scattering and diffraction. It has been conceived for the study of morphology and structure of semiconductor surfaces during ion beam erosion, but it is also used for the study of surface oxidation or thin film growth under ultra‐high‐vacuum conditions. Coherent X‐ray beam experiments are also possible. The chamber is described in detail, and examples of its use are given.     

(Bi1-x Agx)2(Te1-ySey)3粉体的机械合金化制备及其放电等离子烧结体的热电输运特性

采用机械合金化制备了n型(Bi_1-xAg_x)₂(Te_1-ySe_y)₃合金粉体,对其进行XRD分析表明Bi,Te,Ag,Se单质粉末,经2h球磨后实现了合金化;SEM分析表明随着机械合金化时间延长粉体颗粒变得均匀、细小,颗粒尺寸在微米至亚微米数量级.采用放电等离子烧结制备了块体样品,研究了合金成分和球磨时间对热电性能的影响.结果表明材料的热电性能与掺杂元素有密切关系,Ag有利于提高功率因子和降低晶格热导率,球磨10h的(Bi_0.99Ag_0.01)₂(Te_0.96Se_0.04)₃合金粉末的烧结块体具有最大的功率因子和最低的晶格热导率,并在323K取得最高ZT值0.52. 关键词： 1-xAg_x)₂(Te_1-ySe_y)₃合金')" href="#">(Bi_1-xAg_x)₂(Te_1-ySe_y)₃合金 机械合金化 放电等离子烧结 热电性能