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Search Results: 1 - 10 of 22199 matches for " Kun Xiang "
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Magnetic Method Surveying and Its Application for the Concealed Ore-Bodies Prospecting of Laba Porphyry Molybdenum Ore Field in Shangri-La, Northwestern Yunnan Province, China  [PDF]
Nguyen Ba Dai, Chuan Dong Xue, Kun Xiang, Kun Xiang, Tran Trong Lap, Qureshi Javed Akhter, Shi Lei Li
Journal of Geoscience and Environment Protection (GEP) , 2014, DOI: 10.4236/gep.2014.23006
Abstract:

Recently, a number of large molybdenum (-copper) deposits have been discovered successively in the Laba area, Shangri-La county, northwestern Yunnan province. The investigation confirmed that there is a superlarge porphyry-skarn hydrothermal vein type molybdenum-polymetallic- metallogenic system with the total prediction reservoir of more than 150 mt molybdenum. The porphyry intrusions contributed to the mineralization closely, the superficial little vein molybdenum (-copper, lead, silver) ore-bodies are usually located in faults and fractures, and the deep porphyry type ore-bodies occurred in the granodiorite porphyries, the skarn type ore-bodies occurred in the contact zone intrused into Triassic limestone or Permian basalts. Laba ore block is a new exploration area with great prospecting potential. In order to reduce the target area and guide the further exploration work, the magnetic method measurement about 3.3 square kilometres was carried out in the ore field. This paper presents an application of analyzing the horizontal and vertical derivative, using Fast Fourier Transform (FFT) filter (FFT high-pass, low-pass, cosine roll-off, suscepbility), calculated spectra frequency energy to predict the depth and intensity of the apparent remanence magnetization of source (Hilbert). The calculated results and magnetic anomalous show that the remanence anomaly is caused by the intrusions into the Triassic limestone and Permian basalts with small anomalies, and the depth of located source is not great. We have identified a number of positions to the three drilled well, the drilled result specify interpretation with very high accuracy. The magnetic method is helpful to identify porphyry mineralization, and judge the shape and depth of the concealed ore-bearing intrusive bodies under the similar geological condition.

NOTES ON SYRINGA MEYERI SCHNEID. AND ITS CONFUSED SPECIES
蓝丁香及其混淆种的澄清

QIN Xiang,Kun,
秦祥坤

植物分类学报 , 1998,
Abstract: By comparing the type specimens, Syringa spontanea is distinguished from S. meyeri by the small suborbicular lamina palmately 5 veined and the dense pubescence on terete branchlets. Therefore, it is more consistent to recognize S. spontanea as a distinct species.
Notes on Syringa meyeri Schneid. and Its Confused Species
蓝丁香及其混淆种的澄清

QIN Xiang-Kun,
秦祥

中国科学院研究生院学报 , 1998,
Abstract: By comparing the type specimens, Syringa spontanea is distinguished from S. meyeri by the small suborbicular lamina palmately 5-veined and the dense pubescence onterete branchlets. Therefore, it is more consistent to recognize S.spontanea as a distinct species.
Calculating adiabatic evolution of the perturbed DNLS/MNLS solitons
Xiang-Jun Chen,Wa Kun Lam
Physics , 2004, DOI: 10.1016/j.physleta.2005.02.030
Abstract: A symbolic computation technique is developed to calculate adiabatic evolution equations for parameters of the perturbed DNLS/MNLS solitons obtained by the recently developed direct perturbation theory [X.-J. Chen and J. Yang, Phys. Rev. E {\bf 65}, 066608(2002)]. Effects of the intrapulse Raman scattering, third-order group velocity dispersion, and narrow-banded filters with nonlinear gain on the MNLS solitons are studied as examples.
Formation of Millisecond Pulsars with Low-Mass Helium White Dwarf Companions in Very Compact Binaries
Kun Jia,Xiang-Dong Li
Physics , 2014, DOI: 10.1088/0004-637X/791/2/127
Abstract: Binary millisecond pulsars (BMSPs) are thought to have evolved from low-mass X-ray binaries (LMXBs). If the mass transfer in LMXBs is driven by nuclear evolution of the donor star, the final orbital period is predicted to be well correlated with the mass of the white dwarf (WD), which is the degenerate He core of the donor. Here we show that this relation can be extended to very small WD mass ($\sim 0.14-0.17\,M_\odot$) and narrow orbital period (about a few hours), mainly depending on the metallicities of the donor stars. There is also discontinuity in the relation, which is due to the temporary contraction of the donor when the H-burning shell crosses the hydrogen discontinuity. BMSPs with low-mass He WD companions in very compact binaries can be accounted for if the progenitor binary experienced very late Case A mass transfer. The WD companion of PSR J1738+0333 is likely to evolve from a Pop~II star. For PSR J0348+0432, to explain its extreme compact orbit in the Roche lobe-decoupling phase, even lower metallicity ($Z=0.0001$) is required.
Evolution of Transient Low-Mass X-ray Binaries to Redback Millisecond Pulsars
Kun Jia,Xiang-Dong Li
Physics , 2015,
Abstract: Redback millisecond pulsars (hereafter redbacks) are a sub-population of eclipsing millisecond pulsars in close binaries. The formation processes of these systems are not clear. The three pulsars showing transitions between rotation- and accretion-powered states belong to both redbacks and transient low-mass X-ray binaries (LMXBs), suggesting a possible evolutionary link between the them. Through binary evolution calculations, we show that the accretion disks in almost all LMXBs are subject to the thermal-viscous instability during certain evolutionary stages, and the parameter space for the disk instability covers the distribution of known redbacks in the orbital period - companion mass plane. We accordingly suggest that the abrupt reduction of the mass accretion rate during quiescence of transient LMXBs provides a plausible way to switch on the pulsar activity, leading to the formation of redbacks, if the neutron star has been spun up to be an energetic millisecond pulsar. We investigate the evolution of redbacks, taking into account the evaporation feedback, and discuss its possible influence on the formation of black widow millisecond pulsars.
Study of prediction for groundwater contamination in wastewater land treatment system
Liu Zhaochang,Liu Xiang,Zhu Kun,
Liu Zhaochang
,Liu Xiang,Zhu Kun

环境科学学报(英文版) , 1992,
Abstract: This paper uses a prediction model of groundwater pollution based on the experiments in the laboratory and in field .The model, which was tested and calibrated by the field observated data ,satisfactorily simulated the field conditions in land treatment system of wastewater . Particularly , the model can provide the reliable pollution prediction of heavy metals , organisms and nitrogen . The model was used to predict the groundwater pollution caused by the land treatment system in the region of North China . The calibration of the model showed that correlation coefficients between the tested and predictive data of Cr6+. As3+, organism and NH4+ could reach 0.990, which proved that the model possessed the realistic instructive significance for design and use of wastewater land treatment systems .
Targeted gene delivery in tumor xenografts by the combination of ultrasound-targeted microbubble destruction and polyethylenimine to inhibit survivin gene expression and induce apoptosis
Zhi-Yi Chen, Kun Liang, Ri-Xiang Qiu
Journal of Experimental & Clinical Cancer Research , 2010, DOI: 10.1186/1756-9966-29-152
Abstract: Two different expression vectors (pCMV-LUC and pSIREN) were incubated with PEI to prepare cationic complexes (PEI/DNA) and confirmed by the gel retardation assay. Human cervical carcinoma (Hela) tumors were planted subcutaneously in both flanks of nude mice. Tumor-bearing mice were administered by tail vein with PBS, plasmid, plasmid and SonoVue microbubble, PEI/DNA and SonoVue microbubble. One tumor was exposed to ultrasound irradiation, while the other served as control. The feasibility of targeted delivery and tissue specificity facilitated by UTMD and PEI were investigated. Moreover, immunohistochemistry analyses about gene silencing and apoptosis induction were detected.Electrophoresis experiment revealed that PEI could condense DNA efficiently. The application of UTMD significantly increases the tissue transfection. Both expression vectors showed that gene expressions were present in all sections of tumors that received ultrasound exposure but not in control tumors. More importantly, the increases in transgene expression were related to UTMD with the presence of PEI significantly. Silencing of the survivin gene could induce apoptosis effectively by downregulating survivin and bcl-2 expression, also cause up-regulation of bax and caspase-3 expression.This noninvasive, novel combination of UTMD with PEI could enhance targeted gene delivery and gene expression in tumor xenografts at intravenous administration effectively without causing any apparently adverse effect, and might be a promising candidate for gene therapy. Silencing of survivin gene expression with shRNA could be facilitated by this non-viral technique, and lead to significant cell apoptosis.Gene therapy holds great promise for the treatment of cancer diseases. Successful gene therapy requires safe and efficient delivery systems [1]. Most viral vectors pose a potential risk of insertional mutagenesis and interference responses [2]. Nonviral delivery systems are safe and easy to apply, but suffer from
Effects of Different CO2 Levels on Chicken Embryonic Development During Early Stage of Incubation
Hongbing Han,Xiang Li,Kun Yu,Zhengxing Lian
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.2624.2630
Abstract: During the early stage of incubation of chicken eggs, different CO2 concentrations play an important role in the embryonic and postnatal growth. However, the mechanism involved in this process is still not well clarified. In this study, chicken eggs were incubated under different CO2 concentration levels (0.03-0.05, 2, 5 and 10%) during the 1st 4 days of incubation and measured of several embryo growth parameters. It was then found that higher CO2 concentration significantly played down the albumen pH value after 2 days of incubation and the embryo weight and length, diameter of area vasculosa of yolk sac and number of somite all decreased with the increasing of CO2 level. Compared with the mortality (3.23%) and abnormality (0%) in the control group, the corresponding percentages in three treatment groups were much higher with the lowest at 17 and 29%, respectively. Taking the two sides together, it might be well concluded that high CO2 concentration during the 1st 4 days of egg incubation inhibited chicken embryonic development through the lowering of albumen pH value.
1-(4-Cyanobenzyl)-4-methylpyridinium bromide
Hong Chen,Kun Zhu,Guang-Xiang Liu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809020054
Abstract: In the title compound, C14H13N2+·Br , the 1-(4-cyanobenzyl)-4-methylpyridinium cation has a Λ-shaped conformation, and the dihedral angle between the benzene and pyridinium rings is 75.8 (2)°. In the crystal, two cations form a dimer through π–π interactions between pyridine rings [the centroid–centroid distance is 3.685 (1) ].
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