检索结果-南通市图书馆

Growth Cartilage of Piglet： Correlation between MRI Characteristics and Histologic Findings and Measurements of T1 and T2 Relaxation Time

在线全文

学校读者我要写书评

暂无评论

Journal of Nanjing Medical University 2004年第5期18卷 244-249页

作者： lixiao-ming WANGRen-fa LIYong-gang TANGLi-hua YANGBo DepartmentofRadiology TongjiHospitalTongjiMedicalCollegeHuazhongUniversityofScienceandTechnology.Wuhan430030China

Objective: To determine the correlation between MR signal characteristics and histologic findings of growth cartilage and identify the difference in transverse and longitudinal relaxation time between in vivo physeal and epiphyseal cartilage. Methods: Twenty-four knees including distal femora and proximal tibia of 12 2-week-old piglets were imaged at 1.5 Tesla GE MR scanner. The comparison between signal intensity on MRI and architecture in corresponding histologic sections was made. T2 and T1 values were measured by means of multiecho spin-echo sequences and by using inversion-recovery-series, respectively. Results: MRI delineated five different regions between the metaphysis and secondary ossification center and the metaphysis corresponding histologically to zone of provisional calcification of secondary ossification center, physis of the secondary ossification center, epiphyseal cartilage, main physis and main zone of provisional calcification. Both T2 and T1 values in the physeal cartilage were much longer than those in the epiphyseal cartilage (P<0.05). Conclusion: MRI findings differentiate the different zones of growth cartilage and correlate with histologic findings. T2 and T1 are longer in physeal cartilage than in epiphyseal cartilage, perhaps reflecting differences in water binding by proteoglycan.

关键词：生长软骨小猪 MRI 典型特征组织学 T1 T2 测量法张驰时间软骨部分

新疆不同海拔高原边防军人心理健康状况调查分析

在线全文

学校读者我要写书评

暂无评论

中国健康教育 2013年第7期29卷 634-635,653页

作者：康琳李小明肖伟宏党荣理李海龙新疆军区疾病预防控制中心新疆乌鲁木齐830011 兰州军区联勤部卫生部甘肃兰州730099

目的了解新疆高原边防军人人格特征状况和心理能力水平及心理变化规律,为更好的开展心理健康工作提供科学依据。方法采用整群抽样方法,对某部队驻守在海拔3100 m和4300 m两处的219名高原边防军人进行艾森克个性问卷(EPQ)和数字搜索能力... 详细信息

目的了解新疆高原边防军人人格特征状况和心理能力水平及心理变化规律,为更好的开展心理健康工作提供科学依据。方法采用整群抽样方法,对某部队驻守在海拔3100 m和4300 m两处的219名高原边防军人进行艾森克个性问卷(EPQ)和数字搜索能力测验(FST)。结果 FST中在海拔3100 m处军人答题正确数(28.75±1.72)高于海拔4300 m处军人(27.67±3.39),(P<0.05)。EPQ中在海拔3100 m处军人的精神病质(P)和掩饰性(L)得分分别为(4.41±2.76)分和(11.03±4.00)分,4300 m处军人得分分别为(4.58±2.48)分和(10.90±4.01)分,均低于中国军人常模(P<0.01或P<0.05);在海拔3100 m和4300 m处军人的内外向(E)得分分为别为(14.88±4.07)分和(13.70±3.73)分,均高于中国军人常模(P<0.01);在海拔3100 m处军人的神经质(N)得分低于中国军人常模和在海拔4300 m处军人(P<0.05);在海拔3100 m处军人内外向(E)维度的得分高于海拔4300 m处军人(P<0.05)。结论高原边防军人的总体心理健康水平不高,缺氧对心理功能的影响最为明显,随着海拔的增加心理功能受影响愈明显。

关键词：高原军人艾森克个性问卷数字搜索能力测验

Investigation of bubbles escape behavior from low basicity mold flux for high-Mn high-Al steels using 3D X-ray microscope

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 102-110页

作者： Qiang Liu Xiang Li Shen Du ming Gao Yanbin Yin Jiongming Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

During the continuous casting process of high-Mn high-Al steels,various types of gases such as Ar need to escape through the top of the *** which,the behavior of bubbles traversing the liquid slag serves as a restrictive link,closely associated with viscosity and the thickness of liquid *** contrast to two-dimensional surface observation,three-dimensional(3D)analysis method can offer a more intuitive,accurate,and comprehensive ***,this study employs a 3D X-ray microscope(3D-XRM)to obtained spatial distribution and 3D morphological characteristics of residual bubbles in mold flux under different basicity of liquid slag,different temperatures,and different holding *** results indicate that as basicity of slag increases from 0.52 to 1.03,temperature increases from 1423 to 1573 K,the viscosity of slag decreases,the floating rate of bubbles *** addition,when holding time increases from 10 to 30 s,the bubbles floating distance increases,and the volume fraction and average equivalent sphere diameter of the bubbles solidified in the mold flux gradually *** one word,increasing the basicity,temperature,and holding time leading to an increase in the removal rate of bubbles especially for the *** findings of bubbles escape behavior provide valuable insights into optimizing low basicity mold flux for high-Mn high-Al steels.

关键词： mold flux low basicity bubbles three-dimensional X-ray microscope viscosity

Surface micro-arrays enhancing electromagnetic interference shielding of polydimethylsiloxane/multiwalled carbon nanotubes nanocomposites

在线全文

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 508-519页

作者： Ke Jiang Zhi Chen Ji Yu Chen Zheng Shan Huang ming Wang Chongqing Key Laboratory of Soft-Matter Material Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China School of Mechanics Civil Engineering and ArchitecturesNorthwestern Polytechnical UniversityXi’an 710072China Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory(Rongjiang Laboratory) Jieyang 515200China

Herein,the electromagnetic shielding performance of surface concave-convex(SC)and zig-zag micro-arrays was studied by using a simulation prediction and a three-dimensional(3D)printing custom ***,surface stripe concaveconvex(SSC)and surface cylindrical concave-convex(SCC)micro-arrays with or without zig-zag micro-arrays are designed,and their shielding performance is simulated in multi-bands(C-,X-band).The multiwalled carbon nanotubes/polydimethylsiloxane composites(MWCNT/PDMS)with different SC structures and different electrical conductivity are molded in acrylonitrile-butadiene-styrene copolymer(ABS)molds which are printed by a 3D *** results show that the electromagnetic interference shielding effectiveness(EMI SE)of the samples can be enhanced by constructing the SC micro-arrays with zig-zag micro-arrays,and improving with the increase of conductivity and *** addition,the shielding mechanism of the SC-MWCNT/PDMS composites is investigated and discussed by an electromagnetic simulation.

关键词： surface micro-arrays electrical properties electromagnetic interference(EMI)shielding three-dimensional(3D)printing

MoS_(2)Lubricate‑Toughened MXene/ANF Composites for Multifunctional Electromagnetic Interference Shielding

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 358-371页

作者： Jiaen Wang Wei ming Longfu Chen Tianliang Song Moxi Yele Hao Zhang Long Yang Gegen Sarula Benliang Liang Luting Yan Guangsheng Wang School of Physical Science and Engineering Beijing Jiaotong UniversityBeijing 100044People’s Republic of China Key Laboratory of Bio‑Inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191People’s Republic of China

The design and fabrication of high toughness electromagnetic interference(EMI)shielding composite films with diminished reflection are an imperative task to solve electromagnetic pollution *** MXene/ANF(aramid nanofibers)–MoS_(2)composite films with nacre-like layered structure here are fabricated after the introduction of MoS_(2)into binary MXene/ANF composite *** introduction of MoS_(2)fulfills an impressive“kill three birds with one stone”improvement effect:lubrication toughening mechanical performance,reduction in secondary reflection pollution of electromagnetic wave,and improvement in the performance of photothermal *** the introduction of MoS_(2)into binary MXene/ANF(mass ratio of 50:50),the strain to failure and tensile strength increase from 22.1±1.7%and 105.7±6.4 MPa and to 25.8±0.7%and 167.3±9.1 MPa,*** toughness elevates from 13.0±4.1 to 26.3±0.8 MJ m^(−3)(~102.3%)*** the reflection shielding effectiveness(SE_(R))of MXene/ANF(mass ratio of 50:50)decreases~10.8%.EMI shielding effectiveness(EMI SE)elevates to 41.0 dB(8.2–12.4 GHz);After the introduction of MoS_(2)into binary MXene/ANF(mass ratio of 60:40),the strain to failure increases from 18.3±1.9%to 28.1±0.7%(~53.5%),the SE_(R)decreases~22.2%,and the corresponding EMI SE is 43.9 *** MoS_(2)also leads to a more efficient photothermal conversion performance(~45 to~55℃).Additionally,MXene/ANF–MoS_(2)composite films exhibit excellent electric heating performance,quick temperature elevation(15 s),excellent cycle stability(2,2.5,and 3 V),and long-term stability(2520 s).Combining with excellent mechanical performance with high MXene content,electric heating performance,and photothermal conversion performance,EMI shielding ternary MXene/ANF–MoS_(2)composite films could be applied in many industrial *** work broadens how to achieve a balance between mechanical properties and versatility of composites in the case of high-function fillers.

关键词： MXene-MoS_(2) Lubrication toughening EMI shielding Photothermal conversion Electric heating performance

Collective Directional Transport in Symmetric Periodic Potentials by Breaking the Coupling Symmetry

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2003年第5期39卷 549-554页

作者： lixiao-Wen ZHENGZHi-Gang DepartmentofPhysics BeijingNormaluniversityBeijing100875China

Collective unidirectional motion of an asymmetrically coupled array of oscillators in symmetric periodic potentials is studied. A directed current is observed when the drift coupling is presented, while no external biased force is applied. Negative directed current is found when varying system parameters. An addition of a periodic rocking force may enhance the efficiency of directed transport. Resonant steps of the current are found and interpreted as the mode locking between the array and the ac force. Noise-assisted transport is observed, and an optimal noise intensity can give rise to a most efficient transport. The directed transport thus can be optimized and furthermore controlled by suitably adjusting the parameters of the system.

关键词： directional transport mode locking stochastic resonance

Boundary Effects for One-Dimensional Bariev Model with Hard-Core Repulsion

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第4X期42卷 629-636页

作者： lixiao-Jun YUERui-Hong InstituteofModernPhysics NorthwestUniversityXi'an710069China

For the Bariey model for correlated hopping in one dimension under open boundary conditions, the Bethe ansatz equations are analyzed for both a repulsive and an attractive interaction in several limiting cases, i.e., the ground state, the weak and strong coupling limits. The contributions of the boundary fields to both the magnetic susceptibility and the specific heat are obtained.

关键词：高温超导电性 Bariev模型开放边界 Bethe ansat方程磁化系数

Dynamic Regulation of Hydrogen Bonding Networks and Solvation Structures for Synergistic Solar‑Thermal Desalination of Seawater and Catalytic Degradation of Organic Pollutants

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 548-565页

作者： ming‑Yuan Yu Jing Wu Guang Yin Fan‑Zhen Jiao Zhong‑Zhen Yu Jin Qu Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China State Key Laboratory of Organic‑Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Although solar steam generation strategy is efficient in desalinating seawater,it is still challenging to achieve continuous solar-thermal desalination of seawater and catalytic degradation of organic ***,dynamic regulations of hydrogen bonding networks and solvation structures are realized by designing an asymmetric bilayer membrane consisting of a bacterial cellulose/carbon nanotube/Co_(2)(OH)_(2)CO_(3)nanorod top layer and a bacterial cellulose/Co_(2)(OH)_(2)CO_(3)nanorod(BCH)bottom ***,the hydrogen bonding networks inside the membrane can be tuned by the rich surface–OH groups of the bacterial cellulose and Co_(2)(OH)_(2)CO_(3)as well as the ions and radicals in situ generated during the catalysis ***,both SO_(4)^(2−)and HSO_(5)−can regulate the solvation structure of Na^(+)and be adsorbed more preferentially on the evaporation surface than Cl^(−),thus hindering the de-solvation of the solvated Na^(+)and subsequent nucleation/growth of ***,the heat generated by the solar-thermal energy conversion can accelerate the reaction kinetics and enhance the catalytic degradation *** work provides a flow-bed water purification system with an asymmetric solar-thermal and catalytic membrane for synergistic solar thermal desalination of seawater/brine and catalytic degradation of organic pollutants.

关键词： Solar steam generation Seawater desalination Catalytic degradation Bacterial cellulose Cobalt hydroxycarbonate nanorods

Josephson Current in Superconductor-Ferromagnet／Insulator／d-Wave Superconductor Junctions

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第3期43卷 551-555页

作者： lixiao-Wei DONGZheng-Chao DepartmentofPhysics HuaiyinTeachersCollegeHuaian223001China

Solving the Bogoliubov-de Gennes equation, the energy levels of bound statesare obtained in the ferromagnetic superconductor. The Josephson currents in a ferromagneticsuperconductor/Insulator/d-wave superconductor junction are calculated as a function of the exchangefield, temperature, and insulating barrier strength. It is found that the Josephson criticalcurrent is always suppressed by the presence of exchange Geld h and depends on crystalline axisorientation of d-wave superconductor.

关键词： ferromagnetic superconductor d-wave superconductor FS/I/d junctionJosephson current