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| 1 | Preparation of titanium oxycarbide from various titanium raw materials:Part I.Carbothermal reduction显示文摘Carbothermal reduction was performed at temperatures up to 1600°C for vanadium-bearing titanomagnetite,ilmenite concentrate,and high titania slag.The possibility of selective carbothermal reduction was discussed in detail from the viewpoint of thermodynamics,and also tested.The products were analyzed by X-ray diffraction,scanning electron microscopy,and chemical analysis.The results show that it is possible to reduce all iron oxide to metallic iron,and titania to oxycarbide(TiCxOy),without the reduction of other oxides like silica and magnesia. | GAO Chengjun,JIANG Bo,CAO Zhanmin,HUANG Kai,and ZHU Hongmin School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China | 2010 | Rare Metals2010，29，6： | 7 |
| 2 | Geochemical characteristics of hadal sediment in the northern Yap Trench显示文摘Two sediment cores were retrieved in the hadal zone of the Yap Trench,and their concentrations of six major elements Mg,Al,Ca,Ti,Mn and Fe and nine trace elements Sr,Ba,Pb,V,Cr,Co,Ni,Cu and Zn were determined in inductively coupled plasma atomic emission spectrometry(ICP-AES).According to the vertical distribution profiles of the 15 elements,the correlation of their concentrations,the ratios of Ni/Co,V/Cr,Fe/Al,and Ti/Al,and morphological characteristics of the sediment samples,the implications of the depositional environment and the sediment provenance were analyzed.The results show that the ratio of Ni/Co in all depths of the two sediment cores were below 5,and the ratio of V/Cr were lower than 2,indicating that the depositional environment of the hadal zone in the trench was oxidative and might have inflow of the Antarctic bottom oxygen-rich water.The sediment samples on the eastern side of the trench were siliceous mud mainly composed of diatoms,radiolarian,and sponge needles from surface to deep layer.The vertical profile of the elements,the concentration of TOC and the fossil record indicated that the sediment sample from station Dive113 was well mixed from surface to bottom layer.Based on the correlation of concentrations of the elements,the morphological characteristics of the sediment,and the ratios of Fe/Al and Ti/Al,we inferred that the sediment in the hadal zone of the trench had terrestrial,volcanic,biological,and authigenic sources.Major source of the sediment in the eastern side of the trench were terrestrial;whereas the sediment in the western side of the trench received more volcaniclastic input. | HUANG Yuhuan SUN Chengjun YANG Guipeng YUE Xin’an JIANG Fenghua CAO Wei YIN Xiaofei GUO Chaonan NIU Jiaohong DING Haibing | 2020 | Journal of Oceanology and Limnology2020，38，3： | 3 |
| 3 | Water characteristics of abyssal and hadal zones in the southern Yap Trench observed with the submersible Jiaolong显示文摘Using observations in an applied cruise of the submersible Jiaolong,water characteristics,geostrophic transport,and turbulent mixing in abyssal and hadal zones of the southern Yap Trench were studied.The spatial structures of deep water show that the abyssal water is cold,saline,and oxygen rich.The hadal water has very small changes in potential temperature and potential density,and a little decrease in salinity and obvious decrease in oxygen.The isotherm,isopycnal,and isohaline are depressed in abyss over the central trench.The turbulent mixing is enhanced in the near-bottom zone and the hadal water on the trench slope,especially at the steep slope,the dissipation rate and diffusivity is strong,which weakens the stratification.The geostrophic flows move southward in the western region of the trench and northward in the eastern region,indicating cyclonic circulation.In the central region of the trench,the water transport is^1.74 Sv southward.In the hadal zone,the northward and southward transports are balanced.Our analysis suggests that the abyssal water in the southern Yap Trench is from Lower Circumpolar Water(LCPW)and the hadal water seems to be of the isolated local water rather than LCPW. | LIU Xuehai LIU Yongzhi CAO Wei SUN Chengjun | 2020 | Journal of Oceanology and Limnology2020，38，3： | 2 |
| 4 | Distribution characteristics of lipids in hadal sediment in the Yap Trench显示文摘In this study,cored sediment samples collected by the Jiaolong Submersible at 6779 m depth from the hadal zone of the Yap Trench in May 2016 were sliced in 1-cm interval from top to bottom,and lipids in each sediment layer were quantitatively and qualitatively analyzed.The vertical distribution profiles of the lipids in the sediment sample,their main existing forms,and their possible sources were investigated.The results show that the concentration of lipid in the surface sediment was the highest with the carbon number from 12 to 27,dominated by medium and short-chain lipids.The total concentration of fatty acids in surface sediment was much higher than those in the offshore and deep-sea areas,being up to 325.77μg/g due to the funnel effect caused by the“V”terrain of the trench.Fatty acid 18:0 was the most abundant lipids in the sediment sample.Abnormal high concentrations of fatty acid 18:1ω7 and alkanes indicated the existence of hydrothermal fluids in the study area.In addition,saturated fatty acids and monounsaturated fatty acids existed mainly in free form,and polyunsaturated fatty acids existed mainly in bound form.Most of the alkanes were in bound form,and their major source was autochthounous input.The carbon number of alcohols in the sediment sample ranged from 12 to 20,mainly existed in bound form.The source of fatty acids was mainly autochthonous input,and the neutral lipids had both marine and terrestrial origin.This is the first study of lipids in hadal sediment of the Yap Trench.The results will promote deeper understanding of organic carbon cycle in marine environment. | YAN Yixin SUN Chengjun HUANG Yuhuan CAO Wei JIANG Fenghua YANG Guipeng DING Haibing | 2020 | Journal of Oceanology and Limnology2020，38，3： | 2 |
| 5 | Experiment on fractional frequency transmission system显示文摘 | Wang Xifan Cao Chengjun Zhou Zhichao | 2006 | IEEE Transactions on Power Systems2006，21，1： | 1 |
| 6 | Analysis and Simulation for Capacity of Time Division-Synchronous Code Division Multiple Access System显示文摘Capacity both in uplink and downlink of TD-SCDMA (time division-synchronous code division multiple access)system is studied in a multi-cell environment. The theoretical expressions of the mean of intercell interference in uplinkand the mean of sum of power allocation in downlink are given, by which uplink and downlink capacity is analyzed.Furthermore, we give the simulation models for both uplink and downlink capacity. The results from theoretical analysisand simulation fit very well. In the end, the maximum number of users that TD-SCDMA system can serve for 12.2kspeech service is given. | Sun Chengjun, Zhang Zhongzhao, Ba Yong2 & Cao Pengzhi (Communication Research ('enter, Harbin Institute of Technology, Harbin 150001, P. R. China Department of Electronic Engineering, Tsinghua University, Beijing 100084, P. R. China Research and Development Division, Shanghai Bell Company Limited, Shanghai 200092, P. R. China) | 2002 | Journal of Systems Engineering and Electronics2002，13，4： | 1 |
| 7 | Simultaneous 3D Visualization of the Microvascular and Neural Network in Mouse Spinal Cord Using Synchrotron Radiation Micro-Computed Tomography显示文摘Effective methods for visualizing neurovascular morphology are essential for understanding the normal spinal cord and the morphological alterations associated with diseases.However,ideal techniques for simultaneously imaging neurovascular structure in a broad region of a specimen are still lacking.In this study,we combined Golgi staining with angiography and synchrotron radiation micro-computed tomography(SRμCT)to visualize the 3D neurovascular network in the mouse spinal cord.Using our method,the 3D neurons,nerve fibers,and vasculature in a broad region could be visualized in the same image at cellular resolution without destructive sectioning.Besides,we found that the 3D morphology of neurons,nerve fiber tracts,and vasculature visualized by SRjiCT were highly consistent with that visualized using the histological method.Moreover,the 3D neurovascular structure could be quantitatively evaluated by the combined methodology.The method shown here will be useful in fundamental neuroscience studies. | Liyuan Jiang Chengjun Li Miao Li Xianzhen Yin Handing Wu Chunyue Duan Yong Cao Hongbin Lu Jianzhong Hu | 2021 | Neuroscience Bulletin2021，37，10： | 1 |
| 8 | Matching design and mismatching analysis towards radar absorbing coatings based on conducting plate显示文摘 | Cao Maosheng Qin Ruru Qiu Chengjun Zhu Jin | 2003 | Materials and Design2003，24，： | 1 |
| 9 | Matching design and mismatching analysis towards radar absorbing coatings based on conducting plate显示文摘 | Maosheng Cao Ruru Qin Chengjun Qiu Jing Zhu | 2002 | Materials and Design2002，，5： | 1 |
| 10 | 1D Bi_(2)S_(3) nanorods modified 2D BiOI nanoplates for highly efficient photocatalytic activity:Pivotal roles of oxygen vacancies and Z-scheme heterojunction显示文摘In this study,a novel Bi_(2)S_(3)/BiOI Z-scheme photocatalyst with 3D porous hierarchical network-like heterostructure(BSBI NHs)and rich oxygen vacancies(OVs)was fabricated by a facile ion exchange method followed by the in-situ growth process.A possible formation mechanism of BSBI NHs was studied,showing the self-assembled process of in-situ interwoven growth of 1D Bi_(2)S_(3) nanorods(NRs)on the surface of 2D BiOI disk-like nanoplates(NPs),which followed the Ostwald ripening and epitaxial growth.The modification of BiOI NPs by Bi_(2)S_(3) NRs brought about the formation of Z-scheme heterojunction and massive OVs,which improved the visible-light response property and promoted the separation of photoexcited charge carriers of BSBI NHs.BSBI NHs exhibited a significantly enhanced photocatalytic activity compared with Bi_(2)S_(3) and BiOI,and BSBI-1 can remove almost all bacteria and Rhodamine B(RhB)after 60 min visible light illumination.In addition,the photocatalytic mechanism was studied and speculated based on the tests of active species capture,electron spin resonance(ESR),and density functional theory(DFT)simulation calculation,proving the primary roles of·OH,·O_(2)^(-)and h^(+)during the photocatalytic reaction.This work provides new insights into the design and exploitation of novel heterojunctions with highly efficient photocatalytic performances for environmental remediation applications. | Peng Ju Yu Zhang Lei Hao Jiazhen Cao Xiaofan Zhai Kunpeng Dou Fenghua Jiang Chengjun Sun | 2023 | Journal of Materials Science & Technology2023，，11： | 0 |
| 11 | Vertical variations and composition of dissolved free amino acid in the seawater of the Yap Trench in the western Pacific Ocean显示文摘The composition and concentration of dissolved free amino acid(DFAA)of seawater samples collected in May 2016 from the surface to the hadal zone of the northern region of the Yap Trench were analyzed by pre-column derivatization of o-phthalaldehyde.Results show that the average concentration of DFAA in the study area was 0.47±0.36μmol/L.In different sampling stations,the concentrations of DFAA with water depth showed complex variation patterns.At the sediment-seawater interface,the concentrations of DFAA in the western side of the trench were obviously higher than that in its eastern side.In the study area,there were no significant correlations between the concentrations of DFAA and the environmental parameters such as concentrations of chlorophyll a(Chl a),dissolved oxygen(DO),pH,and dissolved inorganic nitrogen(DIN),indicating that the concentrations of DFAA in seawater of the trench are affected by many factors,such as photosynthesis,respiration,temperature,pressure,illumination,and circulation.The dominant DFAA are similar in different water layers of sampling stations,including aspartic acid(Asp),glutamic acid(Glu),glycine(Gly),and serine(Ser).The composition of different amino acids,and the relative abundance of acidic,basic,and neutral amino acids might be related to the sources and consumption of various amino acids.Nine pairs of amino acids in the DFAA showed significantly positive relationship by correlation matrix analysis,suggesting that they might share similar biogeochemical processes.The degradation index(DI)of the DFAA in seawater of the Yap Trench could reflect the degradation,source,and freshness of DFAA in the trench to some extents.This is a preliminary study of amino acids from sea surface to hadal zone in the ocean,more works shall be done in different trenches to reveal their biogeochemical characte ristics in extreme marine environme nts. | Jiaohong NIU Chengjun SUN Bo YANG Lei XIE Fenghua JIANG Wei CAO Yan CHEN Haibing DING Yuhuan HUANG Xianchi GAO | 2023 | Journal of Oceanology and Limnology2023，41，1： | 0 |
| 12 | Characteristics of dissolved sugars in the Southern Yap Trench from sea surface to hadal zone显示文摘2,4,6-Tripyridine-s-triazine(TPTZ)spectrophotometric method was applied to determine the concentrations of dissolved monosaccharides(MCHO),polysaccharides(PCHO),and total carbohydrate(TCHO)in seawater samples collected from sea surface to hadal zone and sediment-seawater interface of the Southern Yap Trench in the Western Pacific Ocean.Results show that the concentrations of MCHO,PCHO,and TCHO ranged from 6.3 to 22.3μmol C/L,1.1 to 25.4μmol C/L,and 12.1 to 44.9μmol C/L,respectively,from the euphotic layer to the hadal zone of the trench.At different sampling stations,the concentrations of MCHO,PCHO,and TCHO in the seawater showed complex vertical variation characteristics,but the overall variation trends were decreasing with water depth.In the Southern Yap Trench,the maximum concentration of MCHO in the seawater appeared in the euphotic layer,and the minimum in the hadal zone.The maximum concentration of PCHO appeared in the euphotic layer,and the minimum in the bathypelagic layer.The water layer where the maxima and minima of the average concentration of TCHO appeared was consistent with that of PCHO.PCHO was the major component of TCHO in the seawater of the Southern Yap Trench.In the seawater from the sediment-seawater interface,the concentrations of MCHO,PCHO,and TCHO ranged from 8.4 to 10.6μmol C/L,3.8 to 5.8μmol C/L,and 12.2 to 15.2μmol C/L,respectively,and MCHO was the major component of TCHO.The key factors affecting the concentration and existing forms of dissolved sugars in the seawater of the Southern Yap Trench included photosynthesis,respiration,polysaccharide hydrolysis,adsorption and desorption of particulate matter,trench“funnel effect”,deep ocean currents,sediment resuspension,and etc.This study provided fundamental data about labile organic matter in abyss and hadal zone of marine environment,which is significant for further understanding of deep-sea organic carbon cycle. | Dong CUI Chengjun SUN Chaonan GUO Wei CAO Fenghua JIANG Haibing DING | 2023 | Journal of Oceanology and Limnology2023，41，6： | 0 |
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