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China’s Import of Wastes and Its Implications

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Chinese Journal of Population,Resources and Environment 2008年第4期6卷 35-40页

作者： guo dongmei Policy Research Center for Environment and Economy Ministry of Environmental Protection Beijing 100029 China

The trade of wastes in the world has been increasing and China has become the largest importer of wastes. This paper examines the import trend of different wastes and finds out that the total import volume to China approved by the Chinese government keeps increasing and the illegal trade can not be banned despite repeated prohibitions; therefore, China is not only "a world factory", but actually "a global garbage dump". In order to well understand the implications of wastes import, this paper further analyzes the resource and environmental ef- fects and risks of different wastes imports as well as the strong driving force of wastes imports. Based on these detailed analysis and solid data, policy recommendations are put forward to reduce the demand for raw materials, to further strengthen the inspection of and supervision over the international trade of the wastes that can be used as raw materials by using the life cycle analysis and risk analysis, to improve the environmental standards and strengthen the disposal capacity, to re-export the raw materials produced from the imported wastes, to develop the long-term planning for the import of wastes and to promote international cooperation.

关键词： Wastes import Resource pressure Environmental risks Economic interests International cooperation

Photocatalytic Hydrogen Evolution from the Splitting of Water over Cd_(1-x)Zn_xS/K_2La_2Ti_3O_(10) Composites under Visible Light Irradiation

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Journal of Wuhan University of Technology(Materials Science) 2015年第5期30卷 928-934页

作者：刘利 guo dongmei 崔文权 HU Jinshan 梁英华 College of Chemical Engineering North China University of Science and Technology Hebei Province Petrochemical Construction Engineering Quality Supervision Station

A series of Cd1-xZnxS/K2La2Ti3O10 composites were synthesized via a simple co-precipitation method. The prepared samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), X-ray energy dispersive spectroscopy(EDX), ultraviolet-visible diffuse reflection(UV-Vis), X-ray photoelectron spectroscopy(XPS) and photoluminescence(PL) measurements. The composite structures consisted of Cd1-xZnxS nanoparticles evenly distributed on the surface of K2La2Ti3O10. The absorption edge of K2La2Ti3O10 shifted to the visible light region upon introduction of the Cd1-xZnxS nanoparticles. The photocatalytic activities of the catalysts were evaluated by hydrogen production under visible light irradiation. The prepared Cd0.8Zn0.2S(30wt%)/K2La2Ti3O10 exhibited higher photocatalytic activity, evolving 6.92 mmol/g H2 under visible light irradiation for 3 h. The promoted photocatalytic activity of the composites was attributed to the synergistic effect between Cd1-xZnxS and K2La2Ti3O10, which resulted in enhanced separation of photogenerated electrons and holes.

关键词： Cd1-xZnxS/K2La2Ti3O10 composites photocatalysis hydrogen evolution water splitting

Moho depth inversion in the Tibetan Plateau from high-precision gravity data

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Earth and Planetary Physics 2023年第4期7卷 487-498页

作者： HuiYou He Jian Fang HePing Sun dongmei guo ZhiXin Xue Jing Hou State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China Wuhan Gravitation and Solid Earth Tides National Observation and Research Station Wuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

The Tibetan Plateau(TP)is the youngest orogenic belt resulting from a continental collision on the *** is a natural laboratory for studying continental dynamics,such as continental convergence,plate subduction,and plateau *** the deep structure of the TP has always been a popular issue in geological *** Moho is the boundary between the crust and the mantle and therefore plays a crucial role in the Earth’s *** such as depth and lateral variation,as well as the fine structure of the crust-mantle interface,reveal the lithospheric dynamics in the *** methods are generally employed to study the Moho surface:seismic detection and gravity *** detection has the characteristic of high precision,but it is limited to a few cross-sectional lines and is quite *** is not suitable for and cannot be carried out over a large area of the *** Moho depth over a large area can be obtained through gravity inversion,but this method is affected by the nature of gravity data,and the accuracy of the inversion method is lower than that of seismic *** this work,a high-precision gravity field model was *** Parker-Oldenburg interface inversion method was used,within the constraints of seismic observations,and the Bott iteration method was introduced to enhance the inversion *** Moho depth in the TP was obtained with high precision,consistent with the seismic detection *** research results showed that the shape of the Moho in the TP is complex and the variation range is large,reaching 60−80 *** contrast with the adjacent area,a clear zone of sharp variation appears at the edge of the *** the interior of the TP,the buried depth of the Moho is characterized by two depressions and two *** the south of the Yarlung Zangbo River,the Moho inclines to the north,and to the north,the Moho depresses downward,which was interpreted as the Indian plate subducting to the north below Tib

关键词： gravity Moho Tibetan Plateau SGG-UGM-2(2159-order high-precision gravity field model)

Precise geoid computation using Stokes-Helmert’s scheme and strict integrals of topographic effects

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Geodesy and Geodynamics 2019年第4期10卷 290-296页

作者： dongmei guo Huiyou He Peng Sang State Key Laboratory of Geodesy and Earth’s Dynamics Institute of Geodesy and Geophysics The Chinese Academy of Science

The high-precision local geoid model was computed based on the improved Stokes-Helmert0 s boundary value problem and strict integrals of topographic effects. This proposed method involves three ***, the mathematical form of Stokes-Helmert0 s boundary value problem was derived, and strict computational formulas regarding topographic effects were provided to overcome the disadvantage of planar approximations. Second, a gravimetric geoid model was constructed using the proposed StokesHelmert0 s scheme with a heterogeneous data set. Third, a least squares adjustment method combined with a multi-surface function model was employed to remove the bias between the gravimetric geoid model and the GNSS/leveling data and to refine the final local geoid model. The accuracy of the final geoid model was evaluated using independent GNSS/leveling data. Numerical results show that an external precision of 1.45 cm is achievable.

关键词： Geoid computation Stokes-Helmert’s method Surface integration Heterogeneous heights

Micro-Displace Sensor Based on Self-Mixing Interference of the Fiber Laser With Phase Modulation

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Photonic Sensors 2014年第4期4卷 379-384页

作者： Hui HAO dongmei guo Ming WANG Wei XIA Xiaoqi NI Jiangsu Key Lab of Opto-Electronic Technology School of Physical Science and Technology Nanjing NormalUniversity Nanjing 210023 China

Micro-displacement measurement based on self-mixing interference using a fiber laser system was demonstrated. The sinusoidal phase modulation technique was introduced into the fiber laser self-mixing interference measurement system to improve the measurement resolution. The phase could be demodulated by the Fourier analysis method. Error sources were evaluated in detail, and the system was experimentally applied to reconstruct the motion of a high-precision commercial piezoelectric ceramic transducer （PZT）. The displacement measurement resolution was well beyond a half-wavelength. It provides a practical solution for displacement measurement based on all optical-fiber sensing applications with high precision.

关键词： Self-mixing interference micro-displacement sensing phase modulation fiber laser

Fabrication of iridium oxide neural electrodes at the wafer level

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Science China(Technological Sciences) 2016年第9期59卷 1399-1406页

作者： ZHANG He PEI WeiHua ZHAO ShanShan YANG XiaoWei LIU RuiCong LIU YuanYuan WU Xian guo dongmei GUI Qiang guo XuHong XING Xiao WANG YiJun CHEN HongDa State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Engineering Research Center for Semiconductor Integrated Technology Institute of Semiconductors Chinese Academy of Sciences

Electro-deposition, electrical activation, thermal oxidation, and reactive ion sputtering are the four primary methods to fabricate iridium oxide film. Among these methods, reactive ion sputtering is a commonly used method in standard micro-fabrication processes. In different sputtering conditions, the component, texture, and electrochemistry character of iridium oxide varies considerably. To fabricate the iridium oxide film compatible with the wafer-level processing of neural electrodes, the quality of iridium oxide film must be able to withstand the mechanical and chemical impact of post-processing, and simultaneously achieve good performance as a neural electrode. In this study, parameters of sputtering were researched and developed to achieve a balance between mechanical stability and good electrochemical characteristics of iridium oxide film on electrode. Iridium oxide fabricating process combined with fabrication flow of silicon electrodes, at wafer-level, is introduced to produce silicon based planar iridium oxide neural electrodes. Compared with bare gold electrodes, iridium oxide electrodes fabricated with this method exhibit particularly good electrochemical stability, low impedance of 386 kW at 1 kH z, high safe charge storage capacity of 3.2 m C/cm^2, and good impedance consistency of less than 25% fluctuation.

关键词： reactive ion sputtering iridium oxide wafer-level neural electrode

Different processing methods and pharmacological effects of Atractylodis Rhizoma

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Chinese Journal of Natural Medicines 2024年第8期22卷 756-768页

作者： guo dongmei XU Kang WAN Qianyun YU Songyang MA Chaoyang ZHANG Baohui LIU Yanju QU Linghang College of Pharmacy Hubei University of Chinese MedicineWuhan 430065China Center for Hubei TCM Processing Technology Engineering Wuhan 430065China Hubei Shizhen Laboratory Wuhan 430065China

Atractylodis Rhizoma,a traditional Chinese medicine with an extensive history of treating gastrointestinal disorders and other diseases,undergoes various processing methods in China to enhance its therapeutic efficacy for specific ***,a comprehensive report detailing the changes in chemical composition and pharmacological effects due to these processing methods is currently *** article provides a systematic review of the commonly employed processing techniques for Atractylodis Rhizoma,including raw Atractylodis Rhizoma(SCZ),bran-fried Atractylodis Rhizoma(FCZ),deep-fried Atractylodis Rhizoma(JCZ),and rice water-processed Atractylodis Rhizoma(MCZ).It examines the alterations in chemical constituents and pharmacological activities resulting from these processes and elucidates the mechanisms of action of the primary components in the various processed forms of Atractylodis Rhizoma in the treatment of gastrointestinal diseases.

关键词： Atractylodis Rhizoma Processing method Pharmacological effect Change in chemical composition Gastrointestinal disease

HERG1 K^+ Channels on the Leukemic Cells Mediated Angiogenesis in vitro

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Wuhan University Journal of Natural Sciences 2014年第2期19卷 178-184页

作者： LI Huiyu guo dongmei ZHENG Fang LIANG Kaiwei LI Wenying JIE Shenghua Center for Stem Cell Research and Application Union HospitalTongji Medical CollegeHuazhong University of Science and Technology

Human ether-a-go-go-related gene （HERG1） K^＋ channels are overexpressed in leukemia, which contributes to neoangiogene- sis. The purpose of this study was to investigate the role of HERG1 K^＋ channels on leukemia angiogenesis. We cultured human umbili- cal vein endothelial cells （HUVECs） in conditioned media, which were derived from leukemic cells with or without E-4031, a HERG1 K^＋ channel special inhibitor. The HUVECs proliferation was mea- sured using CCK-8 assay and migration by a Trans-well. Endothelial tube formation was investigated using Matrigel. Vascular endothelial growth factor （VEGF） levels were tested by ELISA and VEGF mRNA expression using RT-PCR. Our results revealed that blocking HERG1 K^＋ channels could inhibit leukemia-induced HUVECs pro- liferation, migration, and tube formation in vitro. The results sug- gested that HERG1 K~ channels could increase leukemia angio- genesis. Furthermore, blockage of HERG1 K^＋ channels could also decrease leukemic cells secreting VEGF and expressing VEGF mRNA. HERG1 K^＋ channels have a promoting effect on leukemia angiogenesis, and the possible mechanism may be that HERG1 K^＋ channels enhance VEGF expression. Thus, HERG1 K4 channel is a potential target of antiangiogenesis in leukemia.

关键词： HERG1 K^+hannels angiogenesis human umbilical vein endothelial cells leukemia vascular endothelial growth factor (VEGF)

Development of High Temperature Acoustic Emission Sensing System Using Fiber Bragg Grating

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Photonic Sensors 2018年第1期8卷 56-62页

作者： Dandan PANG Qingmei SUI Ming WANG dongmei guo Yaozhang SAI School of Information and Electrical Engineering Shandong Jianzhu University Jinan 250101 China Shandong Provincial Key Laboratory of Intelligent Buildings Technology Jinan 250101 China School of Control Science and Engineering Shandong University Jinan 250061 China

In some applications in structural health monitoring （SHM）, the acoustic emission （AE） detection technology is used in the high temperature environment. In this paper, a high-temperature-resistant AE sensing system is developed based on the fiber Bragg grating （FBG） sensor. A novel high temperature FBG AE sensor is designed With a high signal-to-noise ratio （SNR） compared with the traditional FBG AE sensor. The output responses of the designed sensors with different sensing fiber lengths also are investigated both theoretically and experimentally. Excellent AE detection results are obtained using the proposed FBG AE sensing system over a temperature range from 25℃ to 200℃. The experimental results indicate that this FBG AE sensing system can well meet the application requirement in AE detecting areas at high temperature.

关键词： Optical sensor high temperature fiber Bragg grating acoustic emission