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| 1 | Self-organized criticality and its application in the slope disasters under gravity显示文摘Firstly, three kinds of sand pile experiments which reflect the universal process of energy dissipation within the slope accumulation under the self-organized action are reviewed. They all show that self-organized criticality (SOC) is related to granular non-uniform. The experiment of Tokamak plasma system is introduced, which shows some of SOC properties of Tokamak plasmas in Ohmic region or L-mode. Secondly, material tests in geotechnical engineering and numerical simulations of micro-structure of sand piles indicate that SOC is determined by the structural characteristics. Finally, according to the principle of SOC, the behavior of slope disasters under gravity and its forecast as well as the design of protection engineering are discussed. | YAO Lingkan, HUANG Yuan & LU Yang School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China Southwestern Institute of Physics, Chengdu 610031, China | 2003 | Science China(Technological Sciences)2003，46，z1： | 10 |
| 2 | A Slip-Line Method for Calculating Extrusion Force of Steel Helmet with Cold Extrusion Moulding显示文摘This paper presents the elastic and plastic deformation of the steel helmet with coldextrusion moulding. The plastic streamline of the plastic mould-making process for ellipse thinplate is described. The distribution of slip-line is established based on the plastic streamline. Theextrusion force of plastic moulding of the steel helmet is calculated by using of slip-line method.Furthermore, an applied example is given. | Guo Jinji Zhao Sheng Xing Haoxu(Department of Applied Mechanics and Engineering, Zhongshan University,Guangzhou 510275, P. R. China)Guan Guifen Liu Zhijian(The Iron Steel Research institute of Guangdong,Guangzhou 510275, P. R. China) | 1999 | Journal of Systems Engineering and Electronics1999，10，2： | 2 |
| 3 | Measurements of displacement and trapping force on micron-sized particles in optical tweezers system显示文摘A high-stability optical tweezers equipped with a high-precision measurement system of displacement and force is set up. The results show that this combination can be used to carry out quantitative measurements of small displacements and forces for micron-sized spheres. The precision of measurements has reached nanometers and piconewtons, respectively. | 郭红莲 姚新程 李兆霖 程丙英 韩学海 张道中 | 2002 | Science China Mathematics2002，45，7： | 2 |
| 4 | Freeze-fracture transmission electron microscopy studies on the self-assemblies of amphiphilic solutions显示文摘Self-assemblies of amphiphiles in solutions were investigated by using freeze-fracture transmission electron microscopy(FF-TEM). Especially, vesicles were characterized by FF-TEM and the transition of self-assemblies was determined. The stacked lamellar Lα-phase was prepared without shear forces by a chemical reaction. The stacked lamellar Lα-phase can be transformed into multilamellar vesicles by the shearing forces that occur when the stacked lamellar Lα-phase sample is turned upside down a few times. The multilamellar vesicles can also be transformed into unilamellar vesicles by high shearing forces. These transitions were demonstrated by FF-TEM measurements. Zn2+-induced vesicle formation in the single-chain surfactant solutions was first achieved. | 郝京诚 黄建滨 徐桂英 郑利强 刘维民 H.Hoffmann | 2003 | Science China Chemistry2003，46，6： | 1 |
| 5 | The Heat-swimming Force on the Fiber-like Particle in Noncon-formity Temperature Fluid显示文摘Fiber-like particle suspensions are common in both nature and industry, yet research on them is still in its infancy. This paper focuses on the theoretical analysis of the heat-swimming force operating on the fiber-like particle in nonconformity temperature fluid, and the approximate calculating formula has been proposed. It is indicated that the heat- swimming force on the fiber-like particle is in direct proportion to thetemperature gradient of fluid, but it has opposite direction and that it is restrained by the particle volume, the fluid viscosity and density rather than by the particle density. | 朱泽飞 林建忠 叶秉良 | 2001 | Journal of Donghua University(English Edition)2001，18，1： | 1 |
| 6 | The imaging and dissecting of pBR322 plasmid DNA by AFM显示文摘THE intra- and intermolecular forces of DNA are essential to understanding its structure andfunctional behavior. However, direct measurement of interaction forces requires that the stateof a system be monitored simultaneously while an independent force is applied. Until now, on-ly X-ray crystallography, light scattering, and nuclear magnetic resonance spectroscopy havebeen used to measure these molecular forces using indirect physical and thermodynamic meth- | Tian, F Li, JW Wang, C Bai, CL | 1997 | Chinese Science Bulletin1997，42，13： | 1 |
| 7 | LHCb实验观测到的可能的四夸克态cccc显示文摘The molecular positronium (sometimes also denoted as di-positronium) was the multi-electron bound state composed of e+e-e+e-,where the electromagnetic interaction is the underlying driving force.Although its existence was predicted as early as in1947[1],it remained elusive until it was produced experimentally in 2007[2].One may wonder whether there exists the analogue of the di-positronium in Quantum Chromodynamics,which is the tetraquark state with the flavor configurations cccc.Very recently,the LHCb Collaboration observed distinct structures with the cccc (two charm quarks and two anti-charm quarks) in the J/ψ w-pair mass spectrum[3].They reported a broad structure ranging from6.2 to 6.8 GeV and a narrow structure at around 6.9 GeV with a global significance of more than 5r.Let’s denote it as T4c. | 赵光达 朱世琳 | 2020 | Science Bulletin2020，65，23： | 1 |
| 8 | Micro contact and stick-slip number between AFM probe tip and sample surface显示文摘In an atomic force microscope (AFM), the cantilever probe, probe tip and sample surface form a micro system in which micro contact, elastic deformation, relative sliding and friction occur during scanning with the contact mode. In this paper, the energy conversion and dissipation during scanning process in the micro system is investigated based on the Mauges-Daules contact model. A dimensionless stick-slip number 221s8/()UhkRqh= is defined to describe the micro stick-slip behavior under AFM. Through numerical simulation of the dynamics of the probe tip, it is shown that AFM lateral force is dependent on the defined stick-slip number. If h < 1, lateral force is weak and stick-slip phenomenon disappears. When h =1, the probe tip jumps between the asperities on sample surface, showing stick-slip behavior but without energy dissipation. In the case of h >1, the tip moves off the sticking points with an adhesion hysteresis, resulting in an energy dissipation. Therefore, the stick-slip number can serve as a characteristic parameter. Numerical simulation of AFM lateral force with different stick-slip numbers is in agreement with experimental results. Finally a method to extract frictional force from the AFM lateral force signal is proposed. | 张向军 孟永钢 温诗铸 | 2003 | Science China(Technological Sciences)2003，46，5： | 0 |
| 9 | Effective Interaction Force between an Electric Charge and a Magnetic Dipole and Locality (or Nonlocality) in Quantum Effects of the Aharonov–Bohm Type显示文摘Classical electrodynamics foresees that the effective interaction force between a moving charge and a magnetic dipole is modified by the time-varying total momentum of the interaction fields. We derive the equations of motion of the particles from the total stress-energy tensor, assuming the validity of Maxwell’s equations and the total momentum conservation law. Applications to the effects of Aharonov–Bohm type show that the observed phase shift may be due to the relative lag between interfering particles caused by the effective local force. | Gianfranco Spavieri George T.Gillies Miguel Rodriguez Maribel Perez | 2021 | Chinese Physics Letters2021，38，3： | 0 |
| 10 | On Mechanical Property of Constraint显示文摘ONMECHANICALPROPERTYOFCONSTRAINTWeiYang(韦杨);LiangLifu(梁立孚);LiangZhongwei(梁忠伟)(ReceivedSep.6,1994;CommunicatedbyChienWeizang)A... | 韦杨 梁立孚 梁忠伟 | 1995 | Applied Mathematics and Mechanics(English Edition)1995，16，11： | 0 |
| 11 | 昂桑的艺术之路显示文摘In 1950,the People's Liberation Army marched to Tibet.When they passed through Kham area,the force attracted a large number of ethnic Tibetan youths who explicitly and voluntarily expressed their eagerness to join in the force.A certain Tibetan man from Derge and a young girl from Bathang,respectively named Ngangwang Phuntsok and Ngashi Yangzom。 | Wu Yuchu | 2021 | China's Tibet2021，32，1： | 0 |
| 12 | Effect of excess Y_2O_3 addition on the physical properties of melt processed YBCO bulks显示文摘The YBCO superconductors with Y2O3 addition were prepared by a modified melt textured process and the effects of excess Y2O3 addition on the physical properties of melt textured YBCO have been investigated. It is found that the melt temperature of YBCO samples decreases drastically with the increasing Y2O3, and the maximum levitation forces are drastically different for samples with different Y2O3 addition. It is also found that the optimal Y2O3 addition to YBCO is about 10wt%. Considering the microstructure and the starting composition, the results are well discussed and interpreted. | YANG Wanmin1,2,3, ZHOU Lian2, FENG Yong2, ZHANG Pingxiang2, WU Minzhi3 & W. GAWALEK3 1. Department of Physics, Shaanxi Normal University, Xi抋n 710062, China 2. Northwest Institute for Nonferrous Metal Research. Xi抋n 710016, China 3. Institute fur Physikalische Hochtechnologie e.V(IPHT), Jena, Germany Correspondence should be addressed to Yang Wanmin (email: wm-yang@sohu.com) Received June 27, 2003 | 2004 | Science China(Physics,Mechanics & Astronomy)2004，47，1： | 0 |
| 13 | A Momentum Theorem of Impact Forces Owing to Breaking Waves显示文摘The impact force owing to breaking waves is one of the important wave loadings exerted on the ocean structures, especially the parts nearby mean sea level (MSL). Since the 1950s, people have proposed a great many methods to calculate the impact forces exerted on vertical piles. Early experiential formulae were based on the modified Morison equation according to the experiments by Ross and Hall with a drag coefficient 2.5 times larger for shallow water breakers on slender and cylindrical piles. In 1966, the | 李家春 林缅 | 1993 | Chinese Science Bulletin1993，38，7： | 0 |
| 14 | 网络教育带来的思考显示文摘1 At a session in Davos,Salesforce.com(CRM)CEO Marc Benioff and Sean Parker of Facebook(FB)and Napster hosted a round table.Then someone asked me whether on⁃line education would have broadened my childhood horizons. | 李奕群 | 2024 | 疯狂英语(新悦读)2024，，2： | 0 |
| 15 | Study on Behavior of Interfacial Phase in Mixture of Polycarbonate and Poly (Methyl Methacrylate)显示文摘Poly (methyl methacrylate) (PMMA) is one of the brittle polymers, and shows brittle fracture in tensile test. However, some mechanical properties, e.g. tensile strength, elongation at break and impact strength of the blend in which the brittle PMMA particles are dispersed in the PC matrix, are over the additive values of pure PC and PMMA. This interesting result is first reported by Kong Khen Koo and his coworkers. Then some other polymer pairs with toughening effect were found, e.g. PC/AS, phenoxy/PMMA | 寇喜春 姜振华 张丽梅 马荣堂 郑莹光 董凤霞 | 1993 | Chinese Science Bulletin1993，38，24： | 0 |
| 16 | Definition of Binding Force of Molecular Orbital显示文摘Like many other properties of the molecular orbital (MO), such as energy level,electron negativity and charge distribution, the binding force of the molecular orbitalis regarded as an important physical concept to describe the binding property of themolecular orbital. The MO’s are divided into binding orbital, nonbinding orbital andantibinding orbital according to their respective binding effect. The binding charac-ter of an MO can be determined through the measurement of the changes in | 王向阳 王流芳 彭周人 | 1994 | Chinese Science Bulletin1994，39，2： | 0 |
| 17 | Acclaimed short film records local life显示文摘'Dive In,a short film directed by Wuhan director Zhang Xiaosha,won the honor-of'special nomination by the jury'atthe-16th FIRST International Film.Festival recently.The film was hailed as'highlighting thercity's spirit and its surging life force.' | Wan Xuming | 2022 | Changjiang Weekly2022，，32： | 0 |
| 18 | DRAG FORCE ON BODIES IN A RARERIED PLASMA FLOW显示文摘Expressions were established tens of years ago for the drag forces on typical bodies (flat plate, cylinder, sphere, etc.) immersed in an ordinary-temperature gas flow for the free-molecule regimet. This note extends the analysis to the case where high tempera- | 陈熙 陈小明 | 1990 | Chinese Science Bulletin1990，35，20： | 0 |
| 19 | Influences of greenhouse effect on agricultural production in China显示文摘An obvious warming in China induced by doubled carbon, dioxide as simulated by the climatic models have been found. It is also noticed that there might be drying or wetting in some parts of China induced by doubled CO2 as simulated by the general circulation models(GCMs). Agricultural productivity mainly depends on the temperature, rainfall and soil moisture in China. The changes of agricultural productivity in the different parts of China induced by doubled CO2 have been estimated in this paper. It is shown that the greenhouse effect might cause increasing production in some parts of China and decreasing production in other parts of China. | Gao Suhua, Ding Yihui, Pan Yaru and Zhao Zongci Academy of Meteorological Science,State Meteorological Administration,Beijing 100081,China | 1990 | Journal of Environmental Sciences1990，2，4： | 0 |
| 20 | SHORT-RANGE FORCE IN THE NUMERICAL SIMULATION OF LARGE-SCALE STRUCTURE IN THE UNIVERSE显示文摘In this paper, an improved CPU time-saving method for the calculation of the short-rangeforce in P^3M scheme of the N-body simulation of the large-scale structure in the universe has been proposed. The main point is that, by rearranging the particles according to the cells they belongto, the particle pairs needed to be calculated for the short-range force are greatly decreased, and then the calculation time is much saved. A comparison is given between this method and that of Efstathiou et al., which shows that by giving the same initial conditions and running on the same kind of computers, the former is 1-5 times faster than the latter. | 宋国玄 陈兴明 | 1991 | Science China Mathematics1991，34，1： | 0 |
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