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Highly efficient twin-field quantum key distribution with neural networks

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Science China(Information Sciences) 2023年第8期66卷 281-282页

作者： Jingyang LIU Qingqing JIANG huajian ding Xiao MA Mingshuo SUN Jiaxin XU Chun-Hui ZHANG Shipeng XIE Jian LI Guigen ZENG Xingyu ZHOU Qin WANG Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Telecommunication and Networks National Engineering Research Center Nanjing University of Posts and Telecommunications

Quantum key distribution(QKD) allows two legitimate parties, Alice and Bob, to share a series of random bits that are secured by the laws of quantum mechanics. As a remarkable theoretical progress towards longer distances, the proposal of twin-field QKD(TF-QKD) [1] shows the capability to break a repeaterless bound and provides a key rate in the square-root scale of channel transmittance(i.e.,

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Distribution of rare earth elements in agricultural soil and human body(scalp hair and urine) near smelting and mining areas of Hezhang, China

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Journal of Rare Earths 2016年第11期34卷 1156-1167页

作者：玛瑞亚季宏兵高阳丁淮剑李彩 Energy and Environmental Engineering School University of Science and Technology Beijing State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of Sciences

Rare earth elements （REEs） in recent decade are widely used and lead to the accumulation of REE in the environment and human body. The aim of this study was to evaluate the concentrations of REEs in soil and human body （scalp hair and urine） of peo-ple living in agricultural soil near smelting and mining areas in Hezhang County, China. The results showed that mean concentrations of determined REEs in agricultural soil from smelting areas were higher than background. However, concentration was slightly higher in soil in mining area. In addition, REEs concentrations of hair and urine in smelting areas were higher than those in mining areas.ΣREEs for soil in mining and smelting areas were 177.79 and 277.06 mg/kg, respectively.ΣREEs for hair in mining and smelting were 1.13 and 1.55 mg/kg, respectively, andΣREEs for urine in mining and smelting were 0.58 and 0.59 μg/L, respectively. Results showed that La, Ce and Nd were enriched in soil, hair and urine. Eu in smelting area showed a positive anomaly. In smelting and mining areas, females were more likely than male to expose to REEs. The relationship between REEs concentration and age group showed that hair’s high concentrations of REE existed in 18–40 years age for people from smelting areas and females from mining areas. While high concentrations distributed in the age of 41–65 for males from mining area. However, urine did not present similar distribution for different age group. Compared with hair and urine, soil showed the same distribution of REEs. And according to the Ce/Ce＊ value vs. LaN/YbN ratio showed that hair and soil tended to increase, with the stability of Ce/Ce＊ value. Thus the distri-bution of REEs in soil was closely related with the accumulation in human body. This is a preliminary study which may be suggested to the other research, and this study data may be useful for adding up the data pool on REEs levels in China.

关键词： rare earth elements soil human exposure anomaly age groups

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3层材料层合梁纯弯曲实验测试与分析

实验室研究与探索 2020年第4期39卷 33-36页

作者：蒋泉任良琨丁华建南通大学交通与土木工程学院江苏南通226019

基于平面假设,对纯弯曲条件下3层材料组成的层合梁的纯弯曲问题进行了理论分析,应用电测技术对2组不同材料组成的层合梁分别进行了测试。通过对测试点应变的理论值和实际实验测试值结果进行比较,验证了实验方法和理论解的正确性。对层... 详细信息

基于平面假设,对纯弯曲条件下3层材料组成的层合梁的纯弯曲问题进行了理论分析,应用电测技术对2组不同材料组成的层合梁分别进行了测试。通过对测试点应变的理论值和实际实验测试值结果进行比较,验证了实验方法和理论解的正确性。对层合梁的实验测试和理论分析不仅适用于实际工程研究,同时也可作为材料力学中纯弯曲实验的扩展,进一步加深学生对中心轴和复合材料概念的认识,具有研究意义和实用价值。

关键词：层合梁纯弯曲弯曲正应力实验测试

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具有分级结构钛酸锂的制备及其储锂性能研究

化工新型材料 2021年第8期49卷 111-115页

作者：李欣张明生丁华建赵朔重庆大学化学化工学院重庆401331

以商业二氧化钛(P25)和LiOH分别作为钛源和锂源,采用两步水热和进一步煅烧法制备具有分级结构的钛酸锂(LTO)材料,通过改变煅烧温度调控材料初级颗粒的尺寸,采用X射线衍射、扫描电镜以及恒流充放电等方法对所制备LTO材料微观结构和电化... 详细信息

以商业二氧化钛(P25)和LiOH分别作为钛源和锂源,采用两步水热和进一步煅烧法制备具有分级结构的钛酸锂(LTO)材料,通过改变煅烧温度调控材料初级颗粒的尺寸,采用X射线衍射、扫描电镜以及恒流充放电等方法对所制备LTO材料微观结构和电化学性能进行研究。结果表明:所制备LTO材料具有分级结构,煅烧温度为600℃时所制LTO600的纯度高且初级颗粒尺寸较小,因此表现出优异的倍率和循环性能,其在1C、5C、10C、20C、30C、40C和50C下的比容量分别为148mAh/g、141mAh/g、136mAh/g、133mAh/g、131mAh/g、129mAh/g和126mAh/g,当电流密度达到60C时,其比容量仍高达123mAh/g,同时,其在10C、20C和50C下经500次循环后,容量保持率分别为90.0%、90.1%和88.1%。

关键词：钛酸锂纳米材料制备电化学锂离子电池

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土木专业基础力学实验教学改革及实施探讨

山西建筑 2021年第13期47卷 166-167,170页

作者：曹小建金江丁华建南通大学交通与土木工程学院江苏南通226019

基础力学实验可以帮助学生深入理解力学知识点,为土木专业奠定后续专业课程的基础,同时对培养学生的创新能力也很重要。针对学生实验时理论不扎实、动手动脑少更提不起学习力学的兴趣、力学实验课内容范围窄等现状提出了基础力学实验教... 详细信息

基础力学实验可以帮助学生深入理解力学知识点,为土木专业奠定后续专业课程的基础,同时对培养学生的创新能力也很重要。针对学生实验时理论不扎实、动手动脑少更提不起学习力学的兴趣、力学实验课内容范围窄等现状提出了基础力学实验教学改革及实施的探讨方案。在教学过程中为充分利用实验室并确保动手前已了解相关理论基础,可调整理论顺序来错峰教学;结合互联网及微课,采取10 min内的微视频辅助课后教学与巩固;在实验课程内容上可进一步拓展,引入力学实验竞赛、结构创新大赛及科研课题中力学相关的知识点,促进学生创新思维。辅助大学生创新训练,可适当开放力学实验室。实验教学的开展也能顺应目前专业认证的主流趋势,通过动手促进学生研究实际问题和解决实际问题的能力,达到土木工程毕业要求中研究部分的指标点。

关键词：基础力学实验土木工程实验教学结构创新大赛

高频振动下TC4钛合金超长寿命疲劳断面特征

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热加工工艺 2015年第20期44卷 59-62,65页

作者：曹小建丁华建陈圣球程士超王清远四川大学建筑与环境学院四川成都610065 南通大学建筑工程学院江苏南通226019

在高频(20k Hz)振动下对对称拉压的TC4钛合金进行疲劳试验,对该合金分别经模拟体液浸泡、喷丸强化和固溶时效加喷丸处理后的超长寿命疲劳断面进行观察。结果表明,高频振动下TC4钛合金超长寿命疲劳裂纹萌生于Al元素富集区或内部氧化物等... 详细信息

在高频(20k Hz)振动下对对称拉压的TC4钛合金进行疲劳试验,对该合金分别经模拟体液浸泡、喷丸强化和固溶时效加喷丸处理后的超长寿命疲劳断面进行观察。结果表明,高频振动下TC4钛合金超长寿命疲劳裂纹萌生于Al元素富集区或内部氧化物等夹杂处,裂纹源区的小裂纹扩展主要表现为α相晶面滑移;TC4钛合金内部萌生裂纹与高强钢等的"鱼眼"型裂纹不同,即使夹杂处萌生裂纹也不存在明显的夹杂物区和光学暗区。

关键词：超声疲劳钛合金超长寿命断面

超声表面冲击及喷丸强化后TC4钛合金的生物相容性

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南通大学学报（自然科学版） 2017年第2期16卷 31-35页

作者：赵雅君曹小建金江丁华建内蒙古大学生命科学学院内蒙古呼和浩特010021 南通大学建筑工程学院江苏南通226019

分别在静荷载25 N、振幅30μm、冲击数36 000次/mm2的条件下对TC4钛合金进行超声表面冲击强化(UNSM)处理、采用传统喷丸技术(硬度45~50 HRC且直径1 mm的钢丸,阿尔门强度0.10~0.15 mm A,覆盖率100%)对TC4进行喷丸处理,然后对比研究两种... 详细信息

分别在静荷载25 N、振幅30μm、冲击数36 000次/mm2的条件下对TC4钛合金进行超声表面冲击强化(UNSM)处理、采用传统喷丸技术(硬度45~50 HRC且直径1 mm的钢丸,阿尔门强度0.10~0.15 mm A,覆盖率100%)对TC4进行喷丸处理,然后对比研究两种工艺对TC4生物相容性的影响,包括体液腐蚀行为、表面钙磷的矿化沉积及纤维软骨细胞早期黏附行为,并对处理后TC4钛合金的表面形貌、极化曲线、腐蚀形貌、细胞黏附等进行分析.结果表明:超声冲击可让TC4维持较好的平整度,而喷丸使材料表面粗糙度明显增加;UNSM处理和喷丸处理均在TC4表面产生点腐蚀坑,UNSM处理后的表面点腐蚀坑最多,而喷丸处理后TC4的耐体液腐蚀性能最差;两种表面处理均可增强TC4表面钙磷元素的沉积,且两种表面处理均可增进纤维软骨细胞的早期黏附,UNSM作用更佳.

关键词：超声冲击喷丸 TC4钛合金生物相容性钙磷沉积纤维软骨细胞

表面机械处理纳米化对改善钛基植入物材料机械及生物学性能的研究进展

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南通大学学报（医学版） 2015年第4期35卷 286-289页

作者：朱文俊曾莉曹小建丁华建南通大学医学院南通226001 江苏省南通市妇幼保健院妇产科南通大学建筑工程学院四川大学建筑与环境学院

表面机械处理使钛基植入物表面晶粒尺寸通过强塑性变形逐步细化到纳米量级。纳米表面可增加材料表面粗糙度、减小表面孔隙尺寸、提高表面活性及表面能,从而增强细胞黏附能力、提高蛋白质吸附能力、促进骨再生。本文介绍了机械处理致表... 详细信息

表面机械处理使钛基植入物表面晶粒尺寸通过强塑性变形逐步细化到纳米量级。纳米表面可增加材料表面粗糙度、减小表面孔隙尺寸、提高表面活性及表面能,从而增强细胞黏附能力、提高蛋白质吸附能力、促进骨再生。本文介绍了机械处理致表面纳米化的原理及其对钛基材料机械性能的影响,重点对表面机械处理致纳米化后钛基植入物材料生物学性能的研究进展进行了归纳,以便为相关研究提供信息。

关键词：表面纳米化钛合金生物相容性

Anomalous strain effect on the thermal conductivity of low-buckled two-dimensional silicene

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National Science Review 2021年第9期8卷 23-31页

作者： Bin ding Xiaoyan Li Wuxing Zhou Gang Zhang huajian Gao Institute of High Performance Computing A*STAR Centre for Advanced Mechanics and Materials Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University School of Materials Science and Engineering & Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion Hunan University of Science and Technology School of Mechanical and Aerospace Engineering College of Engineering Nanyang Technological University

The thermal conductivity of two-dimensional materials, such as graphene, typically decreases when tensile strain is applied, which softens their phonon modes. Here, we report an anomalous strain effect on the thermal conductivity of monolayer silicene, a representative low-buckled two-dimensional (LB-2D)material. Reax FF-based molecular dynamics simulations are performed to show that biaxially stretched monolayer silicene exhibits a remarkable increase in thermal conductivity, by as much as 10 times the freestanding value, with increasing applied strain in the range of [0, 0.1], which is attributed to increased contributions from long-wavelength phonons. A further increase in strain in the range of [0.11, 0.18] results in a plateau of the thermal conductivity in an oscillatory manner, governed by a unique dynamic bonding behavior under extreme loading. This anomalous effect reveals new physical insights into the thermal properties of LB-2D materials and may provide some guidelines for designing heat management and energy conversion devices based on such materials.

关键词： low-buckled two-dimensional materials strain effect thermal conductivity bonding dynamics