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Larger in-plane upper critical field and superconducting diode effect observed in topological superconductor candidate InNbS_(2)nanoribbons

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Nano Research 2024年第7期17卷 6686-6694页

作者： Bo Zheng Changlong Wang xukun feng Xiaozhen Sun Shasha Wang Dawei Qiu Xiang Ma Ruimin Li Guanglei Cheng Lan Wang Yalin Lu Peng Li Shengyuan A.Yang Bin Xiang Department of Materials Science and Engineering CAS Key Lab of Materials for Energy ConversionAnhui Laboratory of Advanced Photon Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore 487372Singapore School of Microelectronics University of Science and Technology of ChinaHefei 230052China CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Lab of Low Dimensional Magnetism and Spintronic Devices School of PhysicsHefei University of TechnologyHefei 230009China Research Laboratory for Quantum Materials IAPMEUniversity of MacaoMacaoChina

Recently,the coexistence of topology and superconductivity has garnered considerable ***,the dimensionality of these materials is crucial for the realization of topological quantum ***,the naturally grown materials,especially with one-dimensional feature that exhibits the coexistence of topology and superconductivity,still face challenges in terms of experimental realization and scalability,which hinders the fundamental research development and the potential to revolutionize quantum ***,we report the first experimental synthesis of quasi-one-dimensional InNbS_(2)nanoribbons that exhibit the coexistence of topological order and superconductivity via a chemical vapor transport ***,the inplane upper critical field of InNbS_(2)nanoribbons exceeds the Pauli paramagnetic limit by more than 2.2 times,which can be attributed to the enhanced spin-orbit coupling and the weakened interlayer interaction between the NbS_(2)layers induced by the insertion of In atoms,making InNbS_(2)exhibit spin-momentum locking similar to that of monolayer NbS_(2).Moreover,for the first time,we report the superconducting diode effect in a quasi-one-dimensional superconductor system without any inherent geometric *** measured maximum efficiency is manifested as 14%,observed atμ0H≈±60 mT,and we propose that the superconducting diode effect can potentially be attributed to the presence of the nontrivial topological *** work provides a platform for studying exotic phenomena in condensed matter physics and potential applications in quantum computing and quantum information processing.

关键词： topological order superconductivity nanoribbon superconducting anisotropy superconducting diode

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HACH(DRB200)型消解反应器在废水总氮测定中的应用

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环保科技 2015年第1期21卷 42-44页

作者：冯绪坤魏薇张伟山东省南四湖水质监测中心站山东济宁272100

将HACH（DRB 200）型消解反应器运用于紫外分光光度法测定水中总氮,通过探讨测定过程中碱性过硫酸钾溶液用量、盐酸溶液用量、加热温度和加热时间等影响因素,得到最优实验条件。实验结果表明,该优化方法可节省碱性过硫酸钾溶液和盐酸溶... 详细信息

将HACH（DRB 200）型消解反应器运用于紫外分光光度法测定水中总氮,通过探讨测定过程中碱性过硫酸钾溶液用量、盐酸溶液用量、加热温度和加热时间等影响因素,得到最优实验条件。实验结果表明,该优化方法可节省碱性过硫酸钾溶液和盐酸溶液用量,升温速度快,提高了分析效率,在0.25~5.00 mg/L范围内线性关系良好,方法检出限为0.03 mg/L,实际水样加标回收率处于97.0%~104.0%之间,在准确度、精密度以及最低检出浓度方面均能满足质控要求。

关键词： HACH(DRB 200)型反应器消解总氮

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Learning Semantic Concepts from Noisy Media Collection for Automatic Image Annotation

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Chinese Journal of Electronics 2015年第4期24卷 790-794页

作者： TIAN feng SHEN xukun School of Computer and Information Technology Northeast Petroleum University State Key Laboratory of Virtual Reality Technology and Systems Beihang University

Along with the explosive growth of images, automatic image annotation has attracted great interest of various research communities. However, despite the great progress achieved in the past two decades, automatic annotation is still an important open problem in computer vision, and can hardly achieve satisfactory performance in real-world environment. In this paper, we address the problem of annotation when noise is interfering with the dataset. A semantic neighborhood learning model on noisy media collection is proposed. Missing labels are replenished, and semantic balanced neighborhood is construct. The model allows the integration of multiple label metric learning and local nonnegative sparse *** construct semantic consistent neighborhood for each sample, thus corresponding neighbors have higher global similarity, partial correlation, conceptual similarity along with semantic balance. Meanwhile, an iterative denoising method is also proposed. The method proposed makes a marked improvement as compared to the current state-ofthe-art.

关键词： Image annotation Noisy media collection Semantic neighborhood

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Image Tagging by Semantic Neighbor Learning Using User-Contributed Social Image Datasets

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Tsinghua Science and Technology 2017年第6期22卷 551-563页

作者： feng Tian xukun Shen Xianmei Liu Maojun Cao the School of Computer and Information Technology Northeast Petroleum University Daqing 163318 China xukun Shen is with State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China.

The explosive increase in the number of images on the Internet has brought with it the great challenge of how to effectively index, retrieve, and organize these resources. Assigning proper tags to the visual content is key to the success of many applications such as image retrieval and content mining. Although recent years have witnessed many advances in image tagging, these methods have limitations when applied to high-quality and large-scale training data that are expensive to obtain. In this paper, we propose a novel semantic neighbor learning method based on user-contributed social image datasets that can be acquired from the Web＇s inexhaustible social image content. In contrast to existing image tagging approaches that rely on high-quality image-tag supervision, we acquire weak supervision of our neighbor learning method by progressive neighborhood retrieval from noisy and diverse user-contributed image collections. The retrieved neighbor images are not only visually alike and partially correlated but also semantically related. We offer a step-by-step and easy-to-use implementation for the proposed method. Extensive experimentation on several datasets demonstrates that the performance of the proposed method significantly outperforms others.

关键词： image tag social image tagging user-contributed datasets semantic neighbor learning

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Temperature-dependent photoluminescence of lead-free cesium tin halide perovskite microplates

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Chinese Physics B 2023年第11期32卷 116-123页

作者：谭佳雨周译玄卢德冯旭坤刘玉琪张蒙恩卢方正一黄媛媛徐新龙 Shaanxi Joint Laboratory of Graphene State Key Laboratory of Photon-Technology in Western China EnergyInternational Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics&Photon-TechnologySchool of PhysicsNorthwest UniversityXi’an 710069China

Tin halide perovskites recently have attracted extensive research attention due to their similar electronic and band structures but non-toxicity compared with their lead analogues. In this work, we prepare high-quality CsSnX_(3)(X=Br,I) microplates with lateral sizes of around 1–4 μm by chemical vapor deposition and investigate their low-temperature photoluminescence(PL) properties. A remarkable splitting of PL peaks of the CsSnBr_(3)microplate is observed at low temperatures. Besides the possible structural phase transition at below 70 K, the multi-peak fittings using Gauss functions and the power-dependent saturation phenomenon suggest that the PL could also be influenced by the conversion from the emission of bound excitons into free excitons. With the increase of temperature, the peak position shows a blueshift tendency for CsSnI_(3), which is governed by thermal expansion. However, the peak position of the CsSnBr3microplate exhibits a transition from redshift to blueshift at ~160 K. The full width at half maximum of CsSnX_(3)broadens with increasing temperature, and the fitting results imply that longitudinal optical phonons dominate the electron–phonon coupling and the coupling strength is much more robust in CsSnBr3than in CsSnI_(3). The PL intensity of CsSnX_(3)microplates is suppressed due to the enhanced non-radiative relaxation and exciton dissociation competing with radiative recombination. According to the Arrhenius law, the exciton binding energy of CsSnBr_(3)is ~38.4 meV, slightly smaller than that of CsSnI_(3).

关键词： cesium tin halide perovskite temperature-dependent photoluminescence chemical vapor deposi-tion microplate

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双酚S型杂萘联苯共聚醚砜中空纤维膜结构和性能

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膜科学与技术 2024年第5期44卷 75-81页

作者：李潮徐培琦吕飞王旭昆冯会美李海龙张守海蹇锡高大连理工大学化工学院辽宁省高性能树脂工程技术研究中心辽宁省高分子科学与工程重点实验室大连市膜材料与膜过程重点实验室大连116024

以双酚S型杂萘联苯共聚醚砜(PPESS)为膜材料,聚乙二醇(PEG2000)为添加剂,采用干湿相转化法制备中空纤维膜,考察聚合物浓度、添加剂含量、牵伸速率、空气浴距离及芯液组成与膜结构和性能的关系.采用扫描电子显微镜观察中空纤维膜微观形貌... 详细信息

以双酚S型杂萘联苯共聚醚砜(PPESS)为膜材料,聚乙二醇(PEG2000)为添加剂,采用干湿相转化法制备中空纤维膜,考察聚合物浓度、添加剂含量、牵伸速率、空气浴距离及芯液组成与膜结构和性能的关系.采用扫描电子显微镜观察中空纤维膜微观形貌,并对其性能进行研究.结果表明,聚合物浓度及添加剂含量的增加均会使铸膜液表观黏度呈上升趋势,中空纤维膜中海绵孔结构比例逐渐上升,水通量下降.牵伸速率及空气浴距离的增加使膜的水通量呈下降趋势,当牵伸速率为9 m/min,空气浴距离为10 cm时,膜具有较好的分离性能,水通量为106 L/(m^(2)·h),牛血清蛋白(BSA)截留率为99.8%,对尿素的清除率为52.4%.

关键词：双酚S型杂萘联苯共聚醚砜干湿相转化法结构和性能

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含苯磺酸侧基杂萘联苯聚醚砜纳滤膜的制备与性能

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膜科学与技术 2024年第5期44卷 12-19页

作者：冯会美王丹慧徐培琦徐树刚李潮吕飞王旭昆张守海蹇锡高大连理工大学化工学院辽宁省高性能树脂材料专业技术创新中心辽宁省高分子科学与工程重点实验室大连市膜材料与膜过程重点实验室大连116024

将含苯磺酸侧基杂萘联苯聚醚砜(SPPES-P-H)浸泡于氯化钠溶液中得到含苯磺酸钠侧基杂萘联苯聚醚砜(SPPES-P-Na),采用涂覆法制备含苯磺酸侧基杂萘联苯聚醚砜复合纳滤膜,考察聚合物浓度、热处理条件对复合纳滤膜性能的影响.结果表明,SPPES-... 详细信息

将含苯磺酸侧基杂萘联苯聚醚砜(SPPES-P-H)浸泡于氯化钠溶液中得到含苯磺酸钠侧基杂萘联苯聚醚砜(SPPES-P-Na),采用涂覆法制备含苯磺酸侧基杂萘联苯聚醚砜复合纳滤膜,考察聚合物浓度、热处理条件对复合纳滤膜性能的影响.结果表明,SPPES-P-Na复合纳滤膜的通量高于SPPES-P-H复合纳滤膜的通量;当SPPES-P-Na的质量分数为1.5%,热处理温度为100℃,热处理时间为30 min时,复合膜的水通量达到58.0 L/(m^(2)·h),Na_(2)SO_(4)的脱盐率为89.0%;当操作温度为95℃时,复合膜的水通量为205.0 L/(m^(2)·h),对Na_(2)SO_(4)的脱盐率为82.0%,表现出良好的耐热性;将复合膜在质量浓度0.2 g/L的次氯酸钠溶液中浸泡10 d,性能无明显变化,表现出优异的耐氯性.

关键词：含苯磺酸侧基杂萘联苯聚醚砜复合膜纳滤膜

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北京地区白蜡敛片叶蜂生物学初步观察及色板诱集试验

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植物保护 2024年第4期50卷 318-322页

作者：薛正黄旭昆冯淼王松袁宝庆赵文秀张菁宇张旭杨梦怡北京市昌平区园林绿化局北京102200 北京农生科技有限公司北京101313 北京市昌平区十三陵镇城乡建设服务中心北京102213 北京绿宜生植物养护科技有限公司北京101313

白蜡敛片叶蜂Tomostethus fraxini是近些年白蜡树上新发现的一种食叶害虫,调查发现该虫在北京1年发生1代,以老熟幼虫做茧在土中越冬,3月中旬开始化蛹,3月下旬出现成虫;成虫将卵产于叶片边缘,幼虫取食叶片,为害盛期为4月下旬至5月上旬。... 详细信息

白蜡敛片叶蜂Tomostethus fraxini是近些年白蜡树上新发现的一种食叶害虫,调查发现该虫在北京1年发生1代,以老熟幼虫做茧在土中越冬,3月中旬开始化蛹,3月下旬出现成虫;成虫将卵产于叶片边缘,幼虫取食叶片,为害盛期为4月下旬至5月上旬。色板诱集试验表明,8种颜色粘虫板均可以诱集到成虫,深绿色、蓝色、黄色诱集效果较好,与其他5种颜色粘虫板达到显著性差异。本文对各虫态进行了描述,提供了彩色图片,讨论了该虫发生趋势。

关键词：白蜡敛片叶蜂形态学生物学诱集试验

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双酚S型含侧苯基杂环共聚醚砜的合成和性能

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塑料工业 2024年第8期52卷 72-76,129页

作者：吕飞张守海徐培琦王丹慧徐树刚张瑛楠冯会美李潮王旭昆蹇锡高大连理工大学化工学院高分子材料系辽宁省高性能树脂材料专业创新中心辽宁省高分子科学与工程重点实验室大连市膜材料与膜过程重点实验室辽宁大连116024

为了开发耐高温、可溶解、易于功能化改性的聚芳醚砜,以4-(3-苯基-4-羟基苯基)-2,3-二氮杂萘-1-酮、4,4′-二羟基二苯砜和4,4′-二氯二苯砜为单体,采用高温溶液缩聚法合成一系列不同单体比例的含侧苯基杂环共聚醚砜(PPESS-Ps)。利用核... 详细信息

为了开发耐高温、可溶解、易于功能化改性的聚芳醚砜,以4-(3-苯基-4-羟基苯基)-2,3-二氮杂萘-1-酮、4,4′-二羟基二苯砜和4,4′-二氯二苯砜为单体,采用高温溶液缩聚法合成一系列不同单体比例的含侧苯基杂环共聚醚砜(PPESS-Ps)。利用核磁共振氢谱、红外光谱和X射线衍射表征了PPESS-Ps结构,并测试了PPESS-Ps的特性黏度、分子量、热性能、溶解性、力学性能以及亲水性。结果表明,PPESS-Ps化学结构符合预期,共聚组成可控,其特性黏度介于0.79~0.92 dL/g,数均分子量在2.75×10~4~4.65×10~4之间;PPESS-Ps属于无定形聚合物,其玻璃化转变温度大于245℃,5%热失重温度高于511℃,800℃下残炭率超过40.6%,耐热性好且热稳定性优异;PPESS-Ps能溶于N-甲基吡咯烷酮、N,N-二甲基乙酰胺以及氯仿等有机溶剂中,并且表现出优良的力学性能,其拉伸模量在1.61~1.92 GPa之间,拉伸强度介于55~81 MPa。

关键词：杂环共聚醚砜侧苯基耐热性溶解性

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A Systematic Investigation of Complement and Coagulation-Related Protein in Autism Spectrum Disorder Using Multiple Reaction Monitoring Technology

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Neuroscience Bulletin 2023年第11期39卷 1623-1637页

作者： Xueshan Cao Xiaoxiao Tang Chengyun feng Jing Lin Huajie Zhang Qiong Liu Qihong Zheng Hongbin Zhuang xukun Liu Haiying Li Naseer Ullah Khan Liming She College of Life Science and Oceanography Shenzhen UniversityShenzhen518060China College of Physics and Optoelectronics Engineering Shenzhen UniversityShenzhen518060China Maternal and Child Health Hospital of Baoan Shenzhen518100China Department of Endocrinology Guiyang First People’s HospitalGuiyang550002China Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions Shenzhen518055China Shenzhen Key Laboratory of Marine Biotechnology and Ecology Shenzhen518060China

Autism spectrum disorder(ASD)is one of the common neurodevelopmental disorders in *** etiology and pathogenesis are poorly *** studies have suggested potential changes in the complement and coagulation pathways in individuals with *** this study,using multiple reactions monitoring proteomic technology,16 of the 33 proteins involved in this pathway were identified as differentially-expressed proteins in plasma between children with ASD and *** them,CFHR3,C4BPB,C4BPA,CFH,C9,SERPIND1,C8A,F9,and F11 were found to be altered in the plasma of children with ASD for the first ***1 expression was positively correlated with the CARS *** the machine learning method,we obtained a panel composed of 12 differentially-expressed proteins with diagnostic potential for *** also reviewed the proteins changed in this pathway in the brain and blood of patients with *** complement and coagulation pathways may be activated in the peripheral blood of children with ASD and play a key role in the pathogenesis of ASD.

关键词： pathogenesis children complement

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