Search results for: Shijun Ni

Items from 1 to 20 out of 27 results

article

Compositional and Sr‐Nd isotopic features of the Xiejiayao ophiolite in the North Qilian Orogenic Belt, NW China: Implications for the petrogenesis and tectonic setting

Cong Zhao, Jing Zhao, Shijun Ni, Youliang Chen, more

Geological Journal > 57 > 5 > 1978 - 1988

The ophiolites along the North Qilian Orogenic Belt are considered to be fragments of ancient oceanic crusts and lithospheric mantle of the Palaeozoic North Qilian Ocean (a branch of the Proto‐Tethys). Compared with other ophiolites in this belt, the genesis of the Xiejiayao ophiolite has been poorly studied so far, making it difficult to understand the tectonic evolution of the ocean. In this study,...

article

Transformations of 2-line ferrihydrite and its effect on cadmium adsorption

Yi Huang, Shipeng Zhang, Chao Liu, Huilin Lu, more

Environmental Science and Pollution Research > 2018 > 25 > 18 > 18059- 18070

In this study, 2LFh was synthesized, and the effects of 2LFh synthesis in the laboratory as well as its synthetic products’ mineral crystal phase changes during high temperature aging process caused by Ca²⁺, Mg²⁺, and Cl⁻ were also studied. In addition, the Cd²⁺ adsorption effects of the products above with different pH values and different Cd²⁺ concentrations were studied in this experiment. The...

article

Counting‐loss correction for X‐ray spectroscopy using unit impulse pulse shaping

Xu Hong, Jianbin Zhou, Shijun Ni, Yingjie Ma, more

Journal of Synchrotron Radiation > 25 > 2 > 505 - 513

High‐precision measurement of X‐ray spectra is affected by the statistical fluctuation of the X‐ray beam under low‐counting‐rate conditions. It is also limited by counting loss resulting from the dead‐time of the system and pile‐up pulse effects, especially in a high‐counting‐rate environment. In this paper a detection system based on a FAST‐SDD detector and a new kind of unit impulse pulse‐shaping...

article

Distribution of potentially toxic elements in sediment of the Anning River near the REE and V-Ti magnetite mines in the Panxi Rift, SW China

Xinyu Wang, Zeming Shi, Yue Shi, Shijun Ni, more

Journal of Geochemical Exploration > 2018 > 184 > PA > 110-118

To clarify the impact of developing world-class REE and V-Ti magnetite mines on the distribution of potentially toxic elements (As, Cd, Co, Cu, Cr, Hg, Ni, Pb, Tl, U, and Zn) in adjacent aqueous sediments, thirty sediment samples from the Anning River and seventeen ore samples from the Panxi Rift of China were investigated. The results from this study suggest the following: (1) Mining activities have...

article

Syn‐collision Biotite Hornblende Granodiorite from the Zedong Area, Tibet: Zircon U–Pb Isotope Chronology, Petro‐geochemistry, and Geodynamic Significance

Feilin ZHU, Zeming SHI, Fuhao XIONG, Shijun NI, more

Acta Geologica Sinica ‐ English Edition > 91 > 2 > 515 - 529

Cu–Au mineralization is rare in the Jurassic–Early Tertiary batholiths related to the India–Asia collision. Geochemical analysis and U–Pb isotope chronology was carried out on Shuangbujiere biotite hornblende granodiorite from the Zedong area. Zircon grains of the biotite hornblende granodiorite show oscillatory growth zonation and have high Th/U ratios of 1.08–2.39, indicating a magmatic origin for...

article

Sensitive determination of osmium in natural waters by inductively coupled plasma mass spectrometry after photochemical vapor generation

Ying Gao, Shuzhen Li, Hongyan He, Tonglin Li, more

Microchemical Journal > 2017 > 130 > C > 281-286

Accurate analysis of osmium is important in geochemistry and geochronology. The current osmium analytical methods often suffer from low sensitivity, multi-step extraction, high procedural blank, and severe memory effect. In this work, a highly sensitive and simple method for the determination of osmium in natural waters was developed by coupling inductively coupled plasma-mass spectrometry with photochemical...

article

Bienzyme-based visual and spectrophotometric aptamer assay for quantitation of nanomolar levels of mercury(II)

Ruoxi Zhang, Li Deng, Paijin Zhu, Shuxia Xu, more

Microchimica Acta > 2017 > 184 > 2 > 541-546

The article describes a bienzyme visual system for aptamer-based assay of Hg(II) at nanomolar levels. The detection scheme is based on the finding that Hg(II) ions captured by aptamer-functionalized magnetic beads are capable of inhibiting the enzymatic activity of uricase and thus affect the formation of H₂O₂ and the blue product, i.e., oxidized tetramethylbenzidine. This strategy allows for a visual...

article

Characteristics, Sources and Health Risk Assessment of Trace Metals in PM₁₀ in Panzhihua, China

Xin Cheng, Yi Huang, Zhijie Long, Shijun Ni, more

Bulletin of Environmental Contamination and Toxicology > 2017 > 98 > 1 > 76-83

Ambient PM₁₀ air samples were collected at two industrial sites and one urban residential site in the mining city of Panzhihua, China, from April, 2014, to January, 2015. Mass concentrations of ten trace metals (As, Cd, Cr, Ni, Co, V, Mn, Cu, Pb, and Zn) in PM₁₀ were determined by inductively coupled plasma-mass spectrometry. The results showed Zn, Pb, Cu, Mn and V were the most abundant elements...

article

A chemiluminescence resonance energy transfer system composed of cobalt(II), luminol, hydrogen peroxide and CdTe quantum dots for highly sensitive determination of hydroquinone

Shuxia Xu, Jialin Li, Xianming Li, Min Su, more

Microchimica Acta > 2016 > 183 > 2 > 667-673

This article describes a nonenzymatic chemiluminescence resonance energy transfer (CRET) system for highly sensitive determination of hydroquinone. It was found that the Co(II)-catalyzed luminescence of luminol in pH 11.5 solution is transferred to CdTe quantum dots (QDs) via a CRET mechanism. Hydroquinone is oxidized by H₂O₂ to benzoquinone which quenches the fluorescence of the QDs. The enhancement...

article

Pb Isotopic Geochemistry of the Nuri Cu‐W‐Mo Deposit and Its Implications in Shannan Area, Southern Tibet

Feilin ZHU, Zeming SHI, Shijun NI, Mingyou HE, more

Acta Geologica Sinica ‐ English Edition > 88 > s2 > 670 - 671

article

The Geologic Histroy of the IOCG Deposits in Southwestern China

Hao SONG, Shijun NI, Chengjiang ZHANG, Zhengqi XU, more

Acta Geologica Sinica ‐ English Edition > 88 > s2 > 377 - 378

article

Platinum‐Group Elements Constraint on the Origin Mechanism of the Hetaoshu Rich‐PGE Deposit in the Xiaoguanhe Region, Panxi Area

Feilin ZHU, Yan TAO, Zeming SHI, Shijun NI, more

Acta Geologica Sinica ‐ English Edition > 88 > s2 > 346 - 347

article

New Evidence for Genesis of the Zoige Carbonate‐Siliceous‐Pelitic Rock Type Uranium Deposit in Southern Qinling: Discovery and Significance of the 64 Ma Intrusions

Hao SONG, Chengjiang ZHANG, Shijun NI, Zhengqi XU, more

Acta Geologica Sinica ‐ English Edition > 88 > 6 > 1757 - 1769

The carbonaceous‐siliceous‐argillitic rock type uranium deposit in the Zoige area is located in the northeastern margin of the Tibetan Plateau, and has gained much attention of many geologists and ore deposit experts due to its scale, high grade and abundant associated ores. Because of the insufficient reliable dating of intrusive rocks, the relationship between mineralization and the magmatic activities...

article

Increased sediment discharge driven by heavy rainfall after Wenchuan earthquake: A case study in the upper reaches of the Min River, Sichuan, China

Hairong Ding, Yong Li, Shijun Ni, Guangwen Ma, more

Quaternary International > 2014 > 333 > Complete > 122-129

The Wenchuan earthquake with magnitude 8.0 hit Longmen Mountain on May 12, 2008. The coseismic deformation changed the slope in an instant and caused massive outbreaks of landslides and debris flows, which altered the river transport system. The seismic landslides, debris flows and subsequent heavy rainfall and flooding increased sediment discharge. Data on sediment discharge, rainfall, landslides,...

article

Evolution of isotopic composition and deuterium excess of brines in the Sichuan Basin, China

Qiushi Yan, Zhiyou Gao, Shijun Ni, Zeming Shi, more

Acta Geochimica > 2013 > 32 > 1 > 69-77

The isotopic composition and parameters for deuterium excess of brines, which were sampled in the Sichuan Basin, show obvious regularities of distribution. The brine isotopic composition shows distinct two systems of marine and terrestrial deposits, with the Middle Triassic strata as the boundary. Brine hydrogen isotopic composition of marine deposits is lower while oxygen isotopic composition is...

chapter

Fractal Gradient Method to Determine the Geochemistry Anomaly Concentration Zoning

You Zhou, Shijun Ni, Zeming Shi

2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering > 1 - 4

2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE)

Geochemistry anomaly concentration zoning is an important index in anomaly evaluation of Geochemical prospecting. In traditional methods, the main parameters are often assigned by human and lack of theoretical basis. Geochemical field has fractal feature and gradient feature of its mineral element content, so this paper established fractal gradient indicator. We argues that the Geochemistry anomaly...

chapter

Seize the opportunity of assessment to improve the education management level on department of geochemistry

Xiuhong Peng, Shijun Ni, Chengshi Qing, Chengjiang Zhang, more

2010 IEEE International Conference on Advanced Management Science(ICAMS 2010) > 2 > 303 - 305

2010 IEEE International Conference on Advanced Management Science (ICAMS)

The department of geochemistry of Chengdu University of Technology was restructured on the basis of geochemistry of the traditional advantages of professional department and radioactive geologist department. It was the pillar department of geoscience which relied on Ph.D., MA, degree authorization and postdoctoral workstation. The opportunity of assessment was seized to combine the professional features,...

article

A molecular modeling study on small molecule gas transportation in poly (chloro-p-xylylene)

Chunhai Lu, Shijun Ni, Wenkai Chen, Junsheng Liao, more

Computational Materials Science > 2010 > 49 > 1 Supplement > S65-S69

Results of molecular dynamics (MD) and Monte Carlo (MC) simulations on transport process of small molecules in poly (chloro-p-xylylene) membranes are discussed. Diffusion coefficients have been obtained by MD combined with Einstein fluid equation. Solubility coefficients have also been calculated by the transition state Great Canonical ensemble Monte Carlo (GCMC) method. Then permeability has been...

chapter

Cultivating the scientific research ability of undergraduates with thesis and research project combined

Xiuhong Peng, Shijun Ni, Chengshi Qing, Zeqin Li, more

2010 2nd International Conference on Education Technology and Computer > 4 > V4-430 - V4-432

2010 2nd International Conference on Education Technology and Computer (ICETC 2010)

Graduation thesis research is an important practical teaching part in training the specialized and the overall quality of students in institutions of higher learning, it is an effective way to train the ability of working independently, scientific research and innovation capacity of students. The combination of thesis and research projects had not only solved the lack of funds at present time, but...

chapter

Spatial and Temporal Effect on Heavy Metal Pollution of Atmospheric Dust in Fire Coal of City Power Plant

Xiuhong Peng, Chengshi Qing, Yongqin Ye, Yuanwen Deng, more

2010 4th International Conference on Bioinformatics and Biomedical Engineering > 1 - 4

2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE 2010)

The heavy metal pollution on atmospheric dust made by fire coal of city power plant is receiving more and more attentions, but spatial and temporal effect researches on fire coal amount and heavy metal pollution of atmospheric dust after enterprise' relocation out of urban area are comparatively less. This paper studied three thermal power plants in east city and Beihu Park on the outskirts, doing...

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INFONA - science communication portal

Search results for: Shijun Ni

Compositional and Sr‐Nd isotopic features of the Xiejiayao ophiolite in the North Qilian Orogenic Belt, NW China: Implications for the petrogenesis and tectonic setting

Transformations of 2-line ferrihydrite and its effect on cadmium adsorption

Counting‐loss correction for X‐ray spectroscopy using unit impulse pulse shaping

Distribution of potentially toxic elements in sediment of the Anning River near the REE and V-Ti magnetite mines in the Panxi Rift, SW China

Syn‐collision Biotite Hornblende Granodiorite from the Zedong Area, Tibet: Zircon U–Pb Isotope Chronology, Petro‐geochemistry, and Geodynamic Significance

Sensitive determination of osmium in natural waters by inductively coupled plasma mass spectrometry after photochemical vapor generation

Bienzyme-based visual and spectrophotometric aptamer assay for quantitation of nanomolar levels of mercury(II)

Characteristics, Sources and Health Risk Assessment of Trace Metals in PM₁₀ in Panzhihua, China

A chemiluminescence resonance energy transfer system composed of cobalt(II), luminol, hydrogen peroxide and CdTe quantum dots for highly sensitive determination of hydroquinone

Pb Isotopic Geochemistry of the Nuri Cu‐W‐Mo Deposit and Its Implications in Shannan Area, Southern Tibet

The Geologic Histroy of the IOCG Deposits in Southwestern China

Platinum‐Group Elements Constraint on the Origin Mechanism of the Hetaoshu Rich‐PGE Deposit in the Xiaoguanhe Region, Panxi Area

New Evidence for Genesis of the Zoige Carbonate‐Siliceous‐Pelitic Rock Type Uranium Deposit in Southern Qinling: Discovery and Significance of the 64 Ma Intrusions

Increased sediment discharge driven by heavy rainfall after Wenchuan earthquake: A case study in the upper reaches of the Min River, Sichuan, China

Evolution of isotopic composition and deuterium excess of brines in the Sichuan Basin, China

Fractal Gradient Method to Determine the Geochemistry Anomaly Concentration Zoning

Seize the opportunity of assessment to improve the education management level on department of geochemistry

A molecular modeling study on small molecule gas transportation in poly (chloro-p-xylylene)

Cultivating the scientific research ability of undergraduates with thesis and research project combined

Spatial and Temporal Effect on Heavy Metal Pollution of Atmospheric Dust in Fire Coal of City Power Plant

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