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Material discrimination using cosmic ray muon scattering tomography with an artificial neural network

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Radiation Detection Technology and Methods 2022年第2期6卷 254-261页

作者： Weibo he Dingyue Chang Rengang shi Maobing Shuai Yingru Li Sa Xiao Institute of Materials China Academy of Engineering PhysicsJiangyou 621907China Key Laboratory of Green Manufacturing of Superlight Elastomer Materials of State Ethnic Affairs Commission Hubei Minzu UniversityEnshi 445000China

Introduction Muon scattering tomography(MST)can be employed to scan cargo containers and vehicles for special nuclear materials by using cosmic ***,the flux of cosmic ray muons is relatively low for direct ***,the detection has to be done in a short timescale with small numbers of muons to satisfy the demands of practical *** In this paper,we propose an artificial neural network(ANN)algorithm for material discrimination using *** muon scattering angles were simulated using Geant4 to formulate the training set,and the muon scatter angles were measured by Micromegas detection system to create the test *** The ANN-based algorithm presented here ensures a discrimination accuracy of 98.0%between aluminum,copper and tungsten in a 5 min measurement of 4×4×4 cm^(3)blocks.

关键词： Muon scattering tomography Cargo container inspection Material discrimination Artificial neural network classifier

Responses of Dodonaea viscosa growth and soil biological properties to nitrogen and phosphorus additions in Yuanmou dry-hot valley

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Journal of Mountain Science 2018年第6期15卷 1283-1298页

作者： WANG Xue-mei YAN Bang-guo ZHAO Guang ZHAO Ji-xia shi liang-tao LIU Gang-cai Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and Environment Chinese Academy of Sciences and Ministry of Water Resources Chengdu 610041 China Institute of Tropical Eco-agricultural Sciences Yunnan Academy of Agricultural Sciences Yuanmou 651300 China University of Chinese Academy of Sciences Beijing 100049 China

Nitrogen(N) and phosphorus(P) are limited nutrients in terrestrial ecosystems, and their limitation patterns are being changed by the increase in N deposition. However, little information concerns the plant growth and the soil biological responses to N and P additions among different soils simultaneously, and these responses may contribute to understand plant-soil interaction and predict plant performance under global change. Thus, this study aimed to explore how N and P limitation changes in different soil types, and reveal the relationship between plant and soil biological responses to nutrient additions. We planted Dodonaea viscosa, a globally distributed species in three soil types(Lixisols, Regosols and Luvisols) in Yuanmou dry-hot valley in Southwest China and fertilized them factorially with N and P. The growth and biomass characters of D. viscosa, soil organic matter, available N, P contents and soil carbon(C), N, P-related enzyme activities were quantified. N addition promoted the growth and leaf N concentration of D. viscosa in Lixisols; N limitation in Lixisols was demonstrated by lower soil available N with higher urease activity. P addition promoted the growth and leaf P concentration of D. viscosa in Luvisols; severe P limitation in Luvisols was demonstrated by a higher soil available N: P ratio with higher phosphatase activity. Urease activity was negatively correlated with soil available N in Nlimited Lixisols, and phosphatase activity was negatively correlated with soil available P in P-limited Luvisols. Besides, the aboveground biomass and leaf N concentration of D. viscosa were positively correlated with soil available N in Lixisols, but the aboveground biomass was negatively correlated with soil available P. Our results show similar nutrient limitation patterns between plant and soil microorganism in the condition of enough C, and the nutrient limitations differ across soil types. With the continued N deposition, N limitation of the Lixisols in d

关键词： Nutrient limitation Nitrogen-phosphorus Nitrogen deposition Soil enzyme Dry-hot valley Dodonaea viscosa

益肺养阴方加减联合西医常规治疗肺结核合并2型糖尿病患者的临床观察

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罕少疾病杂志 2024年第1期31卷 44-47页

作者：贺仕伟黄丹彭金霞陆慧芦溪县中医院内二科江西芦溪337022 芦溪县中医院儿童保健科江西芦溪337022 芦溪县中医院肺病科江西芦溪337022 芦溪县中医院针灸康复科江西芦溪337022

目的分析益肺养阴方加减联合常规西医治疗对肺结核伴2型糖尿病患者的疗效。方法选取2021.01-2021.12本院收治的肺结核伴2型糖尿病患者总共80例进行研究,经随机分组法分成对照组(西医常规治疗)和观察组(在对照组基础上开展益肺养阴方加... 详细信息

目的分析益肺养阴方加减联合常规西医治疗对肺结核伴2型糖尿病患者的疗效。方法选取2021.01-2021.12本院收治的肺结核伴2型糖尿病患者总共80例进行研究,经随机分组法分成对照组(西医常规治疗)和观察组(在对照组基础上开展益肺养阴方加减治疗)各有40例,观察两组基线资料、治疗前和治疗6个月后的空腹血糖、餐后2h血糖及糖化血红蛋白水平;治疗6个月后的痰菌转阴率及空洞闭合率;治疗前和治疗6个月后的外周血CD4+、CD8+、CD4+/CD8+、CD3+水平;不良反应出现情况。结果治疗前,两组空腹血糖、餐后2h血糖、糖化血红蛋白相比无显著差异(P>0.05);治疗后,观察组空腹血糖、餐后2h血糖、糖化血红蛋白均低于对照组(P0.05);治疗后,观察组CD4+、CD3+及CD4+/CD8+高于对照组(P0.05)。结论益肺养阴方加减联合常规西医治疗对肺结核伴2型糖尿病患者疗效理想,能控制其血糖水平,降低其痰菌转阴率及空洞闭合率,改善其免疫功能,且安全性较高,值得采用。

关键词：益肺养阴方西医常规治疗肺结核 2型糖尿病免疫功能不良反应

Scaling Laws of heat Flux Width in the HL-2A Closed Divertor Tokamak

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Chinese Physics Letters 2022年第11期39卷 37-41页

作者： Longwen Yan Jinming Gao Xianggan Miao Zhihui Huang Na Wu Wenjin Chen Ting Wu Weice Wang liang Liu Xiaoxue he Kaiyang Yi Yu he Lin Nie Zhongbing shi Wulv Zhong Southwestern Institute of Physics Chengdu 610225China

The scaling law of divertor heat flux width is one of the key topics of magnetic confinement fusion,which is almost inversely proportional to the poloidal magnetic field on some opened divertor *** work focuses on the scaling laws of the closed divertor heat flux width in the HL-2 A tokamak under different discharge conditions,such as the Ohmic,L-and *** results indicate that there are basic similarities of the scaling laws of the heat flux width between the opened and closed ***,a larger spreading width in the private flux region is found,which is relevant to a small expansion factor of the magnetic flux in the closed divertor.

关键词： tokamak magnetic scaling

Density Functional Theory Study on the Complete Substitutions of Nd and Fe by Other Rare-earth and Transition-metal Elements in Nd_(2)Fe_(14)B Compound

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Chinese Journal of Structural Chemistry 2021年第1期40卷 136-144,5页

作者： RAO Shuang LIN Chen-Sheng he Zhang-Zhen CHAI Guo-liang College of Chemistry Fuzhou UniversityFuzhou 350108China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences(CAS)Fuzhou 350002China

To search for proper alternatives to improve the magnetic properties of Nd_(2)Fe_(14)B,using first-principles density functional theory calculations we have systematically studied the R_(2)M_(14)B(R=lanthanides from La to Lu;M=Mn,Fe,Co,and Ni)compounds with the isomorphic structure of Nd_(2)Fe_(14)*** results show that for rare-earth elements,Pr is the most suitable choice for considering as an alternative of *** for the substitution of Fe in Nd_(2)Fe_(14) B by other transition-metal elements,Co is much more suitable than Mn and Ni because the latter two result in too significant reduction of the magnetic moment.

关键词： permanent magnet materials Nd_(2)Fe_(14)B density functional theory calculations

Progress on elliptical magnetic skyrmions

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Rare Metals 2023年第2期42卷 359-367页

作者： Bao-Shan Cui Yong-Qiang Yang Xiao-Bin Guo shi-heng liang Hao Wu Guo-Qiang Yu Songshan Lake Materials Laboratory Dongguan523808China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing100190China Faculty of Physics and Electronic Science Hubei UniversityWuhan430062China School of Physics&Optoelectric Engineering Guangdong University of TechnologyGuangzhou510006China

Magnetic skyrmions,the topological spin textures firstly observed in chiral magnets,have aroused huge interest due to their emergent electromagnetism and potential applications in *** the last decade,significant efforts have been devoted to skyrmion generation,stabilization,and *** most cases,the theoretical and experimental investigations have been performed in the materials where the skyrmions have a circular *** we know,magnetic anisotropy(K_(u))and Dzyaloshinskii-Moriya interaction(DMI)play key roles in the stabilization of the skyrmions in chiral ***,modifying the Kand DMI provide new degrees of freedom for studying the related physics and applications of skyrmions in addition to engineering their energetics and *** this review,the latest progress on the study of the anisotropic deformation of magnetic skyrmions(i.e.,elliptical magnetic skyrmions)is *** physical origins and important advantages of elliptical magnetic skyrmions are mainly focused *** review gives an insight into the understanding of the physical mechanisms of elliptical magnetic skyrmion-hosting systems.

关键词： Dzyaloshinskii-Moriya interaction(DMI) Elliptical magnetic skyrmion Magnetic anisotropy(K_(u)) Skyrmion Hall effect

Eco-friendly aqueous foam stabilized by cellulose microfibers with great salt tolerance and high temperature resistance

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Petroleum Science 2023年第4期20卷 2499-2511页

作者： Li-Li Yang Xian-Bo he Yi-Xiu Cheng Guan-Cheng Jiang Ze-Yu Liu shi-Bo Wang shi-Xin Qiu Jian-Hua Wang Wei-Guo Tian MOE Key Laboratory of Petroleum Engineering State Key Laboratory of Petroleum Resources and EngineeringChina University of Petroleum(Beijing)Changping DistrictBeijing102249China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Engineering PlasticsInstitute of Chemistry Chinese Academy of Sciences(CAS)Haidian DistrictBeijing100190China MOE Key CNPC Drilling Research Institute Changping DistrictBeijing102206China

A low-cost eco-friendly aqueous foam,especially the robust foam with great tolerance to high salinity and high temperature,is in great demand in the oil industry,e.g.,oil and gas well or geothermal well ***,an ultra-stable aqueous foam was developed using the biodegradable cellulose microfiber(CMF)as a foam *** foam stabilized by CMF shows excellent tolerance to the high concentration of NaCl(6.0 wt%)and CaCl_(2)(0.25 wt%)and the related drainage half-life times(T_(0.5))reach 1750 and 2340 s *** contrast,the foams without CMF are completely drained(T_(0.5)=0 s)when NaCl concentration is greater than 6.0 wt%or CaCl_(2) concentration is greater than 0.20 wt%.Notably,T0.5 of the foams stabilized by CMF at these saline concentrations still can maintain above 1000 s even after aging at 120℃ for 16 h,exhibiting an outstanding foam-stabilizing performance at high *** results suggest that the salt and high-temperature tolerance of CMF in foam stabilization is attributed to the electrically uncharged surfaces,the formation of a gel-like structure and the excellent thermal *** work not only provides a promising candidate of aqueous foam stabilizer to deal with high temperature and high salinity but also presents a natural-based solution for an environmentally friendly drilling industry in the future.

关键词： Aqueous foam Foam stabilizer Cellulose microfiber Salt tolerance Sustainable

不同生态区气象因子对花生产量相关性状的影响

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中国油料作物学报 2024年第3期46卷 676-686页

作者：张玉松何柳张云云何晓莹刘亚俊刘珏苏世强陈晓艳陆建美普兴林原小燕云南省农业科学院经济作物研究所云南昆明650205 云南大学农学院云南昆明650500 临沧市农业技术推广中心云南临沧677000 德宏州农业技术推广中心云南芒市678400 盐津县农业技术推广中心云南昭通657500 大理州农业科学研究院云南大理671600 云南省砚山县农业技术中心云南文山663100 东川区经济作物技术推广站云南昆明654100

分析气象因子对花生生长及产量的影响,探讨栽培生境与花生产量形成的关系,旨在为花生生产布局和高产栽培提供参考依据。以9个花生品种为材料,在云南7个不同生态区连续种植2年,采用方差分析、相关性分析和通径分析等方法,分析气象因子对... 详细信息

分析气象因子对花生生长及产量的影响,探讨栽培生境与花生产量形成的关系,旨在为花生生产布局和高产栽培提供参考依据。以9个花生品种为材料,在云南7个不同生态区连续种植2年,采用方差分析、相关性分析和通径分析等方法,分析气象因子对花生农艺性状及产量的影响。结果表明:德宏、大理、东川、临沧和盐津的温度和积温较高,花生结果数多,出仁率和产量较高,是种植花生的适宜区域。方差分析发现花生的生长发育和产量受基因型和环境因素的共同影响,较高的气温和积温有利于缩短花生结荚期进而缩短全生育期天数。通径分析表明产量构成因素中以百果重对产量的影响最大,气象因素中以积温的影响最大。温度越高地上部越高大,单株果数和饱果数越多,百果重和百仁重也就越高,从而增加花生产量。光照时间过长和昼夜温差过大不利于地上部生长和分枝结实。

关键词：花生生态区气象因子农艺性状产量

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酶的理性设计在作物育种中的应用进展与前景展望

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河南农业科学 2024年第5期53卷 1-9页

作者：王东辉王奥轩何长海刘志豪石永春王燃王潇然河南农业大学生命科学学院河南郑州450002 河南省人民胜利渠管理局河南新乡453000

优良种质资源是粮食安全的重要保证,传统育种技术存在周期长、工作量庞大等问题。随着生物学与计算机技术的深度融合,针对作物关键基因进行定向优化的酶的理性设计,为更大限度挖掘优质基因资源奠定了基础,进一步与基因编辑及转基因技术... 详细信息

优良种质资源是粮食安全的重要保证,传统育种技术存在周期长、工作量庞大等问题。随着生物学与计算机技术的深度融合,针对作物关键基因进行定向优化的酶的理性设计,为更大限度挖掘优质基因资源奠定了基础,进一步与基因编辑及转基因技术相结合,成为分子育种技术探索中的重要方向之一。阐述了分子对接、分子动力学模拟、结合自由能评价等酶的理性设计常用方法,综述了酶的理性设计在提高作物品质、抗逆性和生物量方面的应用进展,并对未来的前景进行展望,以期为作物育种新技术的开发和利用提供参考。

关键词：酶理性设计作物育种基因编辑遗传转化