氩离子轰击模拟Zircaloy-4辐照损伤研究

工程技术
论文
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"Irradiation damage simulation of Zircaloy-4 using argon ions bombardment (2008年)" 是一篇2008年发表于《北京科技大学学报》第15卷第3期的文章，由Dequan Peng、Xinde Bai和Feng Pan合作完成。文章探讨了通过氩离子轰击模拟锆合金Zircaloy-4的辐射损伤，旨在理解这种材料在核反应堆中的行为。 文章的核心内容是利用加速器在190 kV的提取电压下，以液氮温度对Zircaloy-4进行氩离子注入，注入剂量范围从1 × 1016到1 × 1017 cm-2。这项实验模拟了实际核环境中材料可能遭遇的高能粒子辐射情况。实验结果显示，氩离子植入对Zircaloy-4的水腐蚀行为产生了显著影响。 作者们通过X射线光电子能谱（XPS）分析了样品表面层元素的价态变化，以了解氩离子植入后材料化学状态的变化。同时，借助透射电子显微镜（TEM）检查了氩离子植入后的微观结构，以揭示材料内部的结构损伤和相变。 根据XPS的结果，可以推断氩离子的植入改变了Zircaloy-4表面的氧化状态，可能形成新的化合物或改变原有氧化物的分布。而TEM的观察则揭示了氩离子导致的晶格缺陷、位错和可能的微观裂纹，这些结构变化可能影响材料的耐腐蚀性和机械性能。 此外，文章可能还讨论了这些变化对Zircaloy-4在核反应堆中长期服役的潜在影响，包括其在高温高压水环境下的耐蚀性和安全性。通过这样的模拟实验，研究者可以预测和评估Zircaloy-4在真实辐射条件下的性能退化，从而为核反应堆材料的设计和改进提供理论依据。 这篇文章是一篇工程技术领域的学术论文，通过实验手段深入研究了Zircaloy-4在模拟辐射条件下的行为，对于理解和改善核能领域关键材料的性能具有重要意义。

The effects of fast neutron irradiation on oxygen in Czochralski-silicon

2020-03-02 上传
当退火温度上升至700℃时，观察到三维空位团簇的消失，氧聚集分解为单个氧原子(O)，这些氧原子返回到间隙位置。FTIR和PAT的结果揭示了在500至700℃之间的不同温度下，氧间隙原子([Oi])浓度的变化和快中子辐照缺陷的...

Please polish the following paragraphs into academic language:Improving the high-temperature mechanical properties of low-activation steels is a frontier topic in nuclear fusion reactor cladding materials. The preparation of ODS low-activation steel by powder metallurgy method is not only complicated, but also has poor processing performance, which makes it difficult to be used in large scale. The high-temperature creep properties and irradiation resistance of CNAs low-activation steels reinforced with nano-MX phase do not reach the level of ODS low-activation steels. It is difficult to effectively control the thermodynamics and kinetics of oxide formation in ODS low-activation steels prepared by melt-casting process, and their tissue uniformity and mechanical properties need to be improved. We propose a new idea of additive manufacturing ODS low-activation steel, using the oxygen atmosphere in the printing process to control the thermodynamic and kinetic processes of oxide formation, so that the active element Ti is oxidized in situ in the matrix to form diffuse titanium oxide with a size of about 10-30 nm, which greatly improves the high-temperature mechanical properties of additive manufacturing low-activation steel, and the 600°C tensile strength is increased from 470 MPa to 660 MPa, which provides a new idea for the integrated preparation of complex components of ODS low-activation steel.

2023-02-15 上传
提高低活化钢的高温力学性能是核聚变反应堆包壳材料的前沿课题。通过粉末冶金法制备ODS低活化钢不仅复杂，加工性能也较差，难以大规模应用。...在熔炼铸造工艺中，难以有效控制ODS低活化钢氧化物形成的热力学和动力学...

润色下面英文：The controlled drug delivery systems, due to their precise control of drug release in spatiotemporal level triggered by specific stimulating factors and advantages such as higher utilization ratio of drug, less side-effects to normal tissues and so forth, provide a new strategy for the precise treatment of many serious diseases, especially tumors. The materials that constitute the controlled drug delivery systems are called “smart materials” and they can respond to the stimuli of some internal (pH, redox, enzymes, etc.) or external (temperature, electrical/magnetic, ultrasonic and optical, etc.) environments. Before and after the response to the specific stimulus, the composition or conformational of smart materials will be changed, damaging the original balance of the delivery systems and releasing the drug from the delivery systems. Amongst them, the photo-controlled drug delivery systems, which display drug release controlled by light, demonstrated extensive potential applications, and received wide attention from researchers. In recent years, photo-controlled drug delivery systems based on different photo-responsive groups have been designed and developed for precise photo-controlled release of drugs. Herein, in this review, we introduced four photo-responsive groups including photocleavage groups, photoisomerization groups, photo-induced rearrangement groups and photocrosslinking groups, and their different photo-responsive mechanisms. Firstly, the photocleavage groups represented by O-nitrobenzyl are able to absorb the energy of the photons, inducing the cleavage of some specific covalent bonds. Secondly, azobenzenes, as a kind of photoisomerization groups, are able to convert reversibly between the apolar trans form and the polar cis form upon different light irradiation. Thirdly, 2-diazo-1,2-naphthoquinone as the representative of the photo-induced rearrangement groups will absorb specific photon energy, carrying out Wolff rearrangement reaction. Finally, coumarin is a promising category photocrosslinking groups that can undergo [2＋2] cycloaddition reactions under light irradiation. The research progress of photo-controlled drug delivery systems based on different photo-responsive mechanisms were mainly reviewed. Additionally, the existing problems and the future research perspectives of photo-controlled drug delivery systems were proposed.

2023-02-06 上传
控制药物释放系统是指可以控制药物空间和时间释放的系统，可以通过一些特定的刺激因素激活，具有药物利用率更高、对正常组织的副作用更小等优势，为精确治疗许多严重疾病，尤其是肿瘤提供了新的策略。...

有关半导体照明microLED发表在Top期刊中的文章，要求在2020年后发表的，至少30篇，并用中文简单介绍一下它们的内容

2023-03-25 上传
17. "Photo-Irradiation-Mediated Selective Etching of InGaN-Based Materials for Micro-LED Fabrication": 该文章介绍了一种新的微型LED制造技术，利用光照选择性腐蚀InGaN材料。 18. "Multicolor Micro-LEDs ...

翻译This reversible actuation scheme offers stable performance in extended cycling tests (100,000 cycles), as validated using a simple 3D ribbon structure with one side bonded to a substrate (fig. S5), heated locally by exposure to a laser scanned at a frequency of 5 Hz for 7.5 hours. The laser used here has a spot size of 2.5 mm for easy alignment and a power of 188 mW (corresponding to an intensity of ~950 mW/cm2 ) for effective heating. The irradiation conditions must be selected to avoid damage to the constituent materials (33). The experimental setup includes a microscope (Keyence, VHX-5000) to record the deformations (movie S1) and a customized algorithm to capture the position of the top edge (fig. S6). As shown in fig. S7, the mean and SD of the highest positions in the initial 50 cycles are 27.1 and 1.80 mm, respectively, and those after 135,000 cycles are 26.3 mm (mean of 50 cycles) and 2.19 mm (SD of 50 cycles). An indenter with fixed displacement serves as the basis for measurements of forces generated from the 3D ribbon structure (fig. S8A). As shown in fig. S8B, the force reaches ~47 N at 70°C.

2023-06-13 上传
这种可逆致动方案通过使用一个与底部粘结在一起的简单的三维带状结构（图S5）在长时间的循环测试（100,000个周期）中表现出稳定的性能，并通过激光进行局部加热来进行验证。使用的激光在易于对准的2.5毫米的光斑大小...

History of BNCT

2023-03-30 上传
Boron neutron capture therapy (BNCT) is a therapeutic technique that uses a combination of boron-containing compounds and neutron radiation to target cancer cells. The history of BNCT can be traced ...

Good morning all teachers and students, my name is liangwenjun The topic of my report is Influence of molten salt potential on stress corrosion cracking behavior of 316 stainless steel. Stress corrosion cracking (SCC) is the cracking of sensitive materials resulting from the combined action of a fixed tensile stress and some specific corrosive medium.As shown in the picture on the right， Stress corrosion cracking is also one of the main causes of reactor structural material failure。 Structural materials for molten salt reactors must have good resistance to fluoride corrosion, excellent mechanical properties, good resistance to high temperature oxidation and irradiation Stainless steels such as 316 have ASME certification for high-temperature pile materials andare very economical.Therefore, many companies are considering 316 stainless steel as a structural material when designing molten salt reactors。Such as Kairos power and Terra power. 316 showed good corrosion resistance in purified molt en fluoride salt, and in Chen's study 316 did not crack with or without Cr addition under the synergistic effect of stress. Therefore, we accelerate corrosion by adding europium ion, and in the study to quantify the molten salt potential and stress magnitude, and finally determine the effect of molten salt potential on stress corrosion cracking of 316 stainless steel.

2023-02-15 上传
早上好，各位老师和同学们，我的名学是梁文军。我的报告的主题是：熔盐电位对316不锈钢应力腐蚀开裂行为的影响。 应力腐蚀开裂（SCC）是指敏感材料由固定的拉应力和某些特定腐蚀介质的结合作用导致的裂纹。...

CREATE TABLE "CDR"."CIS_BLOOD_REQ_ORDER" ( "PLA_BRANCH_CODE" VARCHAR2(12) NOT NULL ENABLE, "REQUEST_NO" VARCHAR2(32) NOT NULL ENABLE, "SEQ" VARCHAR2(4) NOT NULL ENABLE, "PLAN_BLOOD_DATE" DATE NOT NULL ENABLE, "BLOOD_ORDER" VARCHAR2(16) NOT NULL ENABLE, "BLOOD_NUM" NUMBER(10,4) NOT NULL ENABLE, "UNIT" VARCHAR2(16) NOT NULL ENABLE, "BLOOD_PURPOSE" VARCHAR2(128) NOT NULL ENABLE, "REQ_DOCTOR" VARCHAR2(16) NOT NULL ENABLE, "STATE" VARCHAR2(4), "INVALID_EMPID" VARCHAR2(16), "INVALID_TIME" DATE, "ORDER_TYPE" VARCHAR2(16) NOT NULL ENABLE, "BLOOD_BAG_NO" VARCHAR2(32), "BLOOD_BAG_EFID" VARCHAR2(32), "NURSE1_SIGNATURE" VARCHAR2(16), "NURSE1_SIGNATURE_TIME" DATE, "NURSE2_SIGNATURE" VARCHAR2(16), "NURSE2_SIGNATURE_TIME" DATE, "RECEIVE_EMPID" VARCHAR2(16), "RECEIVE_TIME" DATE, "BACK_EMPID" VARCHAR2(16), "BACK_TIME" DATE, "RETURN_EMPID" VARCHAR2(16), "RETURN_TIME" DATE, "RETURN_REASON" VARCHAR2(128), "IS_IRRADIATION" VARCHAR2(4), "IS_MATCHING" VARCHAR2(4), "MODIFY_TIME" DATE, "OLD_ROWID" VARCHAR2(64), "BUSINESS_SYSTEM_ID" NUMBER(9,0), CONSTRAINT "CIS_BLOOD_REQ_ORDER_R01" PRIMARY KEY ("PLA_BRANCH_CODE", "REQUEST_NO", "SEQ", "BUSINESS_SYSTEM_ID") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "CDR" ENABLE ) 转hive语法

2023-06-13 上传
`BLOOD_NUM` DECIMAL(10,4) NOT NULL, `UNIT` STRING NOT NULL, `BLOOD_PURPOSE` STRING NOT NULL, `REQ_DOCTOR` STRING NOT NULL, `STATE` STRING, `INVALID_EMPID` STRING, `INVALID_TIME` DATE, `ORDER_...

Java 代码实现了一个简单的文本编辑器-可运行

2024-10-17 上传
Java 代码实现了一个简单的文本编辑器

MATLAB实现基于Attention-LSTM的多特征分类预测（含完整的程序和代码详解）

2024-10-17 上传
内容概要：本文详细介绍了如何使用MATLAB实现基于Attention机制的LSTM模型进行多特征分类预测。主要内容包括程序设计思路、代码实现、模型构建与训练、模型评估及可视化、以及简单的GUI界面设计。模型可以在多个领域应用，如金融数据分析、医疗诊断等。 适合人群：对深度学习和分类预测感兴趣的科研人员和开发人员，具备一定的MATLAB和深度学习基础。 使用场景及目标：适用于需要处理时间序列数据并进行分类预测的项目。目标是通过Attention-LSTM模型提高分类准确率，同时提供直观的可视化结果和友好的用户界面。 其他说明：文中提供了详细的代码实现和注释，读者可以通过实践加深对模型的理解。此外，还讨论了模型优化和未来的研究方向。
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