论城市居民假日健身游

从城市居民的旅游和体育健身两方面出发，对假日体育旅游健身产品的开发途径，方法进行论述，深入分析了新产品开发的必要性，迫切性，提出了体育旅游健身产品开发的具体内容，同时论证了其开发的可行性。     

Effect of New O-Superfamily Conotoxin on Voltage-Activated Currents of Hippocampal Neurons

The effects of a new O-superfamily conotoxin, SO3, on sodium current (INa), transient A-type potassium currents (IA), and delayed rectified potassium currents (IK), were examined in cultured rat hippocampal neurons using the whole-cell patch clamp technique. Addition of SO3 caused a concentration-dependent, rapidly developing, and reversible inhibition of voltage-activated currents. The IC50 values for the blockage of INa, IA, and IK were calculated as 0.49, 33.9, and 7.6 μmol/L, respectively. The determined Hill coefficients were 1.7, 0.6, and 1.2, respectively. These results indicate that SO3 can selectively inhibit neuronal sodium and potassium currents.     

CO adsorption on electrode of Pt nanoparticles investigated by cyclic voltammetry and <Emphasis Type="Italic">in situ</Emphasis> FTIR spectroscopy

Pt nanoparticles were prepared by the chemical reduction method.The average diameter of Pt nanoparticles was determined to be 2.5nm by TEM.The electrochemical propertis of Pt nanoparticles were studied by cyclic voltammetry,In comparison with massive Pt,the oxidation current peak of CO adsorbed on Pt nanoparticles in broader.Twin adsorbates of CO on Pt nanoparticles were determined by in situ FTIRS for the first time.It has revealed that the linear and twin-bonded CO can be converted into bridge-bonded CO with the variation of electrode potential.A series of special properties of Pt nanoparticles,such as enhanced IR absorption of CO adsorbates,were also observed.     

Receptive field plasticity of neurons in rat auditory cortex

Using conventional electrophysiological technique, we investigated the plasticity of the frequency receptive fields (RF) of auditory cortex (AC) neurons in rats. In the AC, when the frequency difference between conditioning stimulus frequency (CSF) and the best frequency (BF) was in the range of 1--4 kHz, the frequency RF of AC neurons shifted. The smaller the differences between CSF and BF, the higher the probability of the RF shift and the greater the degree of the RF shift. To some extent, the plasticity of RF was dependent on the duration of the session of conditioning stimulus (CS). When the frequency difference between CSF and BF was bigger, the duration of the CS session needed to induce the plasticity was longer. The recovery time course of the frequency RF showed opposite changes after CS cessation.The RF shift could be induced by the frequency that was either higher or lower than the control BF, demonstrating no clear directional preference. The frequency RF of some neurons showed bidirectional shift, and the RF of other neurons showed single directional shift. The results suggest that the frequency RF plasticity of AC neurons could be considered asan ideal model for studying plasticity mechanism. The present study also provides important evidence for further study of learning and memory in auditory system.     

Late Cretaceous-Cenozoic exhumation history of Tiantangzhai region of Dabieshan Orogen： Constraints from （U-Th）／He and fission track analysis

Integrated fission track and (U-Th)/He analysis is carried out on 6 apatite and 6 zircon samples from a near vertical section in The Tiantangzhai region at the core of the present Dabieshan orogen. The result shows that the region experienced cooling/exhumation during the Late Cretaceousand Early Tertiary period. Age-elevation relationships for different dating systems and different minerals suggest a pulse of rapid exhumation at ～110 Ma before present, preserved in the structurally highest samples. At lower elevations, ages begin to decrease with decreasing elevation, suggesting lower exhumation rates since 90 Ma. Two periods of different exhumation rates are identified since 90 Ma. The average apparent exhumation rate for the period of 43.4—22.5 is 0.062 km/Ma, whereas that for the period of 76.4—47.4 Ma is 0.039 km/Ma.     

GPS单频PPP电离层延迟改正模型探讨

针对电离层延迟会导致GPS单频精密单点定位精度严重缺失的情况,分别探讨了克罗布歇模型、格网模型和历元差分模型,并采用IGS跟踪站数据进行电离层延迟改正。同时根据改正后的单频精密单点定位精度,比较了这三种电离层延迟改正模型的改正效果。结果表明:历元差分模型的改正效果最好,其改正后单频精密单点定位精度可达到厘米级,能较好地符合实际应用要求。     

Advances and applications of electrohydrodynamics

Electrohydrodynamics (EHD) has been applied in many areas, such as EHD enhanced heat transfer, EHD pump, electrospray mass spectrometry, electrospray nanotechnology, etc. The basic theories underlying these applications and a brief review of the EHD advances are presented in this paper. As electrospray is an important branch of EHD,the applications of electrospray are particularly discussed.Finally, this paper gives some suggestions for the future research and development.     

Undoped semi-insulating indium phosphide (InP) and its applications

During the past several years, the research and development of InP material has made great progress due to serving as the substrate for most optoelectronic devices operating at the communications wavelength of 1.31 and 1.55 μm. At present, InP has become an important semiconductor material together with Si and GaAs. When compared to GaAs, InP has higher electron velocity, higher radiation hardness and better heat-conducting property. The advantage of InP crystal material allows higher frequency operation and lower power requirements. Therefore, InP is widely being used for the manufacture of microwave devices, high-frequency devices and optoelectronic integrated circuits (OEICs) which are indispensable for wireless technology, satellite communications^[1—3]. Although n-type and p-type InP can meet actual needs, semi-insulating InP substrates remain to be improved due to their poor uniformity and consistency. For this reason, several possible approaches have been reported to the preparation of SI InP by wafer annealing under different conditions^[4—9].     

A study on nano-sized NiO electrodes doping with C and Co prepared by electrochemical deposition-sintering processes and their capacitance performance

In the present work, it was studied that nanoosized NiO electrodes doping with C and Co were prepared by electrochemical deposition in an ethanol solution containing nickel nitrate and cobalt nitrate and sintering processes. The capacitance performance of such electrodes was also studied. The results reveal that samples obtained by electrochemical deposition first on a porous nickel cathode in an ethanol solution contain 0.5 mol/L nitrates, in which Ni(NO3)2 and Co(NO3)2 were mixed in a molar proportion of 8 : 2. After sintering at 300℃ for 2 h, they exhibited the best performance. XRD analysis illustrates that the essential phase of the product is NiO doping with certain content of C and Co. The particles of product imaged a spherical morphology with sizes of 20---30 nm in diameter, and with an average crystal size of 4--5 nm. The capacitance measurement of the simulating C/NiO capacitors indicates that a single electrode can reach as high as 410.0 F/g, and still maintain the value of 323 F/g after 30 recycles showed as a stabilized value with increasing recycles, when it was discharged at a current of 5 mA.     

SHRIMP zircon U-Pb ages of Kalatongke No. 1 and Huangshandong Cu-Ni-bearing mafic-ultramafic complexes,North Xinjiang,and geological implications

In Xinjiang, northwestern China, there are some veryimportant magmatic Cu-Ni sulfide deposits hosted by ma-fic-ultramafic complexes. In addition to the Jingbulake inwestern Tianshan and the Xingdi in northeastern Tarimblock, the others are concentrated in the Kalatongke andHuangshan-Jingerquan mafic-ultramafic complex beltsand two largest Cu-Ni sulfide deposits occur in the Kala-tongke No.1 and Huangshandong complexes. In the pastdecade, a great number of researches have been conductedfo…