Qinhuangdao, China
Qinhuangdao, China

Yanshan University is a university in Qinhuangdao, Hebei, China under the provincial government. It has student population of 38,000 and a staff population of 3000 .The origin of Yanshan University can be traced back to the Harbin Institute of Technology founded in 1920. In 1958, the Department of Heavy Machinery of HIT and its related specialties moved to the strategic industrial town of Fulaerji, Qiqihar in Northeast China's Heilongjiang Province and was renamed the School of Heavy Machinery of HIT. In 1960, the school became independent as the Northeast Heavy Machinery Institute, and in 1978, it was accredited as one of the eighty-eight national key institutions of higher learning. Starting in 1985, it began to relocate southward to the historic seaside city of Qinhuangdao in Hebei Province and completed the migration in 1997 when it was accredited by the former State Education Commission to adopt the present name of Yanshan University .The YSU campus covers an area of 5,000 mu with a total construction area of nearly one million square meters. At present, the university has a faculty and staff of 3000, including 2,000 teachers, of which 326 are professors and 422 are associate professors. The university has a student population of 38,000.YSU has five postdoctoral research stations, six disciplines of 35 subdisciplines conferring doctoral degrees, 13 disciplines of 80 subdisciplines conferring master degrees, 16 masters of engineering programs, one Master of Public Administration program, one Master of Business Administration program, as well as 60 undergraduate programs. With such a wide range of programs, YSU has become a multiversity with emphasis laid on engineering studies and importance attached to liberal arts, science, economics, management, law and education.YSU consists of twenty-one colleges and schools. YSU runs five national key disciplines, four key disciplines of national defense, thirteen key provincial disciplines, one key national laboratory, thirteen key provincial laboratories and engineering centers.YSU is known for its world-renowned achievements in the development of whole-set heavy machinery and equipment, the theory and technology of parallel robots, the technology of fluid transmission and electro-hydraulic servo-systems, the technology and equipment of precision plasticity figuration, technology of thermal treatment of big forging, the technology of mega amorphous bodies, metastable materials and technology, the theory and technology of industrial automation, etc.YSU has won seventeen national scientific and technological awards in a row since 1996, including three first-class China State Science and Technology Progress Awards, ten second-class Awards, two third-class Awards, one State Technology Invention Award, and one second-class National Natural science Award. The university has undertaken more than 300 national research projects, including those funded by the 973 Programs, the 863 Programs, as well as the National Natural science Foundation and the National Social science Foundation. In 1999, YSU established its high-tech park in the Qinhuangdao Economic and Technological Development Zone. The park was officially established by the Chinese Ministry of Science and Technology and Ministry of Education as a national university science park in September 2003, thus becoming one of the 34 national university science parks of its kind.The university also attaches great importance to international academic exchange and collaboration, and has conducted joint study and research programs with institutions from the United Kingdom, the United States, Canada, Norway, Germany, France, Italy, Ireland, Japan, Korea, etc.Qinhuangdao City in which YSU is located is a coastal resort city just 260 km northeast of Beijing. As one of the Class A tourist destinations in China, Qinhuangdao attracts visitors from China and abroad with the beginning of the Great Wall , the First Pass Under Heaven on the Great Wall, the summer resort Beidaihe Beach, the sandy Golden Beach at the Nandaihe area, the safari zoo, and other scenic spots which are all within easy access. Wikipedia.


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Zhao X.,Yanshan University
Journal of hazardous materials | Year: 2011

The melamine-diethylenetriaminepentaacetic acid/polyvinylidene fluoride (MA-DTPA/PVDF) chelating membrane bearing polyaminecarboxylate groups was prepared for the removal of Ni(II) from wastewater effluents. The membrane was characterized by SEM, (13)C NMR and FTIR techniques. Quantitative adsorption experiments were performed in view of pH, contact time, temperature, the presence of Ca(II) and lactic acid as the controlling parameters. Adsorption kinetics and equilibrium were examined regarding the single Ni(II) system, binary Ni(II) and Ca(II) system and nickel-lactic acid complexes system. The desorption efficiency was also evaluated, and the adsorption mechanism was suggested based on experimental data. The results show that the sorption kinetics fit well to Lagergren second-order equation and the isotherms can be well described by Langmuir model. At 298 K, the second-order rate constant is calculated to be 4.171, 11.39, 6.203 cm(2)/(mg min) and the equilibrium uptake is 0.0264, 0.0211 and 0.0216 mg/cm(2) in the aforementioned three systems. The distribution coefficient of Ni(II) slowly decreases from 4.27 to 2.72, and the separation factor (f(Ni(II)/Ca(II))) increases from 3.10 to 8.46 when the initial Ca(II) concentration varies from 20 to 200mg/L. This reveals the chelating membrane shows more affinity for Ni(II) than Ca(II) ions. In the studied range of lactic acid concentration, Ni(II) uptake decreases with the maximum ratio of 10%. Chemical bonding (chelation) dominates in the adsorption process, and the negative ΔG° and ΔH° indicate the spontaneous and exothermic nature of adsorption. Crown Copyright © 2011. Published by Elsevier B.V. All rights reserved.


Gao F.,Yanshan University
Inorganic Chemistry | Year: 2010

Size dependence effects in semiconductor clusters have been a subject of extensive studies for the last two decades. However, it is still difficult to employ the existing theoretical models to give reliable results of energies for clusters in the whole nanometer region. Here we offer a new theoretical method for the quantum size effects based on the idea that the energy gap shift of the cluster arises from the sum of the surface effect shift and quantum effect shift parts. We express the effects through algebraic relations rather than through variational solutions of the wave equation, without the use of any special adjustable parameter. Results reveal for the first time that the shape of the energy gap shift curve is dominated by the surface energy shift. Our method can also predict quantitatively the size dependence of dielectric constant. The new theoretical findings in the ultrasmall (<1 nm) anatase TiO2and the silicon clusters cannot be explained using previous theories. © 2010 American Chemical Society.


Jiang W.-G.,Yanshan University
International Journal of Mechanical Sciences | Year: 2012

A concise finite element model for simple wire strand under pure bending is presented in this paper. Accurate bending symmetric boundary condition has been developed and applied to the periodic artificial cross-sectional end boundaries of the wire strand finite element model. To achieve better analysis accuracy, full three-dimensional solid elements were used for structural discretization. For the global behaviour of the wire strand, i.e. bending moment vs. bending curvature, the finite element results showed good agreement with the analytical elastic strand model of Costello (Theory of wire rope, 2nd ed. New York: Springer-Verlag; 1997) in elastic loading regime. Furthermore, the finite element model can predict the detailed progressive nonlinear plastic behaviour of the wire strand. © 2011 Elsevier Ltd. All rights reserved.


Gao F.,Yanshan University
Applied Physics Letters | Year: 2011

A quantum confinement model for nanocrystals developed is extended to study for the optical gap shifts in core/shell quantum dots and nanowires. The chemical bond properties and gap shifts in the InP/ZnS, CdSe/CdS, CdSe/ZnS, and CdTe/ZnS core/shell quantum dots are calculated in detail. The calculated band gaps are in excellent agreement with experimental values. The effects of structural taping and twinning on quantum confinement of InP and Si nanowires are elucidated. It is found theoretically that a competition between the positive Kubo energy-gap shift and the negative surface energy shift plays the crucial role in the optical gaps of these nanosystems. © 2011 American Institute of Physics.


Patent
Yanshan University | Date: 2013-01-02

The present invention discloses a shaft rotating constant-width curve double- stator multi-speed motor, comprising a rotor (5), an inner stator (19), an outer stator (3), sets of sliders (22) mounted on the rotor, a left end cover (6) and a right end cover (1), a curve of an external surface of a front portion of the inner stator (19) and a curve of an internal surface of the outer stator (3) are two similar curves which are smooth and closed, wherein oil distributing ports in outer stator (20) are opened on the outer stator (3) in the number of 2n (n is the number of actions), oil distributing ports in inner stator (24) are opened on the external surface of the front portion of the inner stator (19), and the inner stator (19) is mounted in the rotor (5) . The multi-speed motor of the present invention works stably and has a small volume, a light weight, a high efficiency and a large specific power. According to the present invention, a plurality of hydraulic motors of different inputs set in one shell, so as to output different speeds and torques when the motors have different inputs or outputs.


Patent
Yanshan University | Date: 2015-03-23

A nano-pearlite rail, which is a steel rail having an internal microstructure of 100% pearlite with an average interlamellar spacing of pearlite of 55-70 nm, and containing 0.83 to 0.93 of C, 0.05 to 0.10 of Mn, a certain content of Al and Si, 1.0 to 1.5 of Cr, 0.1 to 0.3 of Co, 0.35 to 0.55 of Zr, 0.02 to 0.06 of Mg, 0.01 to 0.05 of Cu, less than 0.025 of S, less than 0.025 of P, and the balance Fe, wherein the content of Al is 8 to 12 times the content of Mn and the collective content of Al and Si is 1.5 (in wt. %). A process for manufacturing the nano-pearlite rail mainly comprises subjecting a molten steel to refining and continuous casting and roiling to form a rail, in combination with controlled cooling of the rail after rolling, and stress relieving and tempering treatment. The manufacturing process of the present invention is simple, and easy to be operated in a large scale. The rail thus obtained has a tensile strength of no less than 1300 MPa, a yield strength of no less than 1000 MPa, a hardness of HRC 44-47, and an elongation of no less than 10%, as well as excellent wear resistance and fatigue resistance, and is particularly suitable for applications in heavy-haul railways, especially for the railway segments having a sharp turn, and for a wing rail in bainite steel combined frog.


Patent
Yanshan University | Date: 2013-09-24

A method for producing low temperature bainite steel containing aluminum may include providing an alloy steel containing aluminum, carbon, chromium, silicon, molybdenum, manganese and nickel, wherein the amount of aluminum is in the range of 0.5 to 1.5 wt. %, and the amount of carbon is in the range of 0.2 to 1.1 wt. %; smelting to convert the alloy steel into a molten steel, followed by subjecting to refining and vacuum degassing, and then subjected to rolling or forging; heating the steel to 880-950 C., cooling the steel to M_(s)+10 C. at a rate higher than 50 C./min, continuously and slowly cooling the steel from M_(s)+10 C. to M_(s)100C(wt %) C., holding the steel at a temperature of 250 C. to 350 C. for 20 to 30 min, and then air cooling the steel to room temperature, holding the steel at a temperature of 180 C. to 280 C. for 60 min, and then air cooling the steel to room temperature.


The invention relates to an ultrahard nanotwinned boron nitride bulk material and synthetic method thereof. Particularly, the invention discloses a nanocrystalline cubic boron nitride bulk material containing high density of twins and synthetic method thereof, in which a nanotwinned boron nitride bulk are synthesized from nanospherical boron nitride particles (preferably with a size of 5-70 nm) with onion-like structure as raw materials by using high temperature and high pressure synthesis. As compared with the prior arts, the nanotwinned boron nitride bulk obtained according to the invention has a much higher hardness than that of a normal cubic boron nitride single crystal. The nanotwinned boron nitride bulk has great prospects in applications, such as precision and ultra-precision machining, abrasives, drawing dies, and special optics as well as other fields.


A method for preparing fluorine/nitrogen co-doped graphitized carbon microspheres with high volumetric specific capacitance, mainly comprises: successively adding a carbon source, a nitrogen source, a fluorine source and a surfactant to a reactor under a nitrogen atmosphere, and stirring for 10-30 minutes before sealing the reactor; placing the reactor into a crucible furnace, heating at 300-600 C., for 6-48 hours, followed by naturally codling the reactor to room temperature and removing the reaction mixture therefrom; successively washing the resulted reaction mixture with absolute ethanol, 0.1 M-5 M diluted hydrochloride acid and distilled water for 3-6 times, filtering, and placing powder thus obtained in a vacuum oven and drying in vacuum at 60-100 C. for 6-12 hours. The present invention provides a simple process with moderate reaction conditions, high reproducibility, and low costs. The fluorine/nitrogen co-doped graphitized carbon microspheres prepared according to the present invention have a very high density, exhibit good electrochemical properties in an alkaline environment, as well as very high volumetric specific capacitance and good cyclic stability, and is of great importance in improving the properties of the electrode material for a capacitor.


The present invention relates to ultrahard nanotwinned diamond bulk materials and synthetic method thereof. In particular, the present invention discloses a diamond bulk material containing high density of nanocrystalline twins and synthetic method thereof, in which a nanotwinned diamond bulk is synthesized from particles of nanospherical onion-like carbon without diamond core (preferably with a size of 5-70 nm) as raw materials by using high temperature and high pressure synthesis. As compared with the prior art, the nanotwinned diamond bulk obtained according to the present invention has a much higher hardness than that of single crystal diamond and that of ultrahard polycrystalline diamond. The nanotwinned diamond bulk has wide prospects in various applications, including geological drilling, machining fields such as high speed cutting and precision and ultra-precision machining, abrasives, drawing dies, and special optics as well as other fields.

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