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Sorely reducing emissions of non-methane short-lived climate forcers will worsen compound flood-heatwave extremes in the Northern Hemisphere

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Advances in Climate Change Research 2024年第4期15卷 737-750页

作者： Ying-Fang li zhi-li wang Ya-Dong LEI Xiao-Chao YU lin liU Hui-Zheng CHE Xiao-Ye ZHANG State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of China Meteorological Administration Chinese Academy of Meteorological SciencesBeijing 100081China University of Chinese Academy of Sciences Beijing 100190China

Non-methane short-lived climate forcer(SLCF)or near-term climate forcer(NTCF)emissions,as a significant driver of climate change,can be reduced to improve air *** reductions may contribute to additional warming of the climate system in the short term,thereby strongly affecting the likelihood of climate ***,there has been no quantitative assessment of the impact of non-methane SLCF mitigation on compound flood-heatwave extremes(CFHEs).This study quantitatively investigates the changes in future(2031-2050 versus 1995-2014)CFHEs and the resulting population exposure in the Northern Hemisphere(NH)due to non-methane SLCF *** used multi-model ensemble simulations under two future scenarios from the Aerosol and Chemistry Model Intercomparison Project(AerChemMIP)in the Coupled Model Intercomparison Project Phase 6(CMIP6).The two future scenarios share the same greenhouse gas(GHG)emissions but have weak(Shared Socioeconomic Pathway(SSP)3-7.0)versus strong(SSP3-7.0-lowNTCF)levels of air quality control *** results show that future non-methane SLCF reductions during 2031-2050 results in about a 7.3%±2.3%increase in grid exposure to CFHEs in the NH relative to the period *** frequency,intensity,and duration of CFHEs increase by varying *** the period 2031-2050,the frequency of CFHEs across the NH increases by 2.9±0.9 events per decade due to non-methane SLCF *** increases in CFHE frequency are more pronounced in East Asia,South Asia,Siberia,and northern and eastern North *** East and South Asia,the in-tensities of both heatwaves and floods corresponding to CFHEs increase markedly,where heatwave magnitude(HWM)increases by 0.3±0.2 K in East Asia and weighted average precipitation(WAP)increases by 18.3%±15.3%and 12.0%±4.5%in East Asia and South Asia,*** other regions,rising temperatures dominate the increase in *** regard to the duration of CFHEs,future reductions in non-methane SLC

关键词： Non-methane SLCFs CHFEs Cleaner air Population exposure

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Two-dimensional shallow water equations with porosity and their numerical scheme on unstructured grids

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Water Science and Engineering 2013年第1期6卷 91-105页

作者： zhi-li wang Yan-fen GENG State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research Institute School of Transportation Southeast University

In this study, porosity was introduced into two-dimensional shallow water equations to reflect the effects of obstructions, leading to the modification of the expressions for the flux and source terms. An extra porosity source term appears in the momentum equation. The numerical model of the shallow water equations with porosity is presented with the finite volume method on unstructured grids and the modified Roe-type approximate Riemann solver. The source terms of the bed slope and porosity are both decomposed in the characteristic direction so that the numerical scheme can exactly satisfy the conservative property. The present model was tested with a dam break with discontinuous porosity and a flash flood in the Toce River Valley. The results show that the model can simulate the influence of obstructions, and the numerical scheme can maintain the flux balance at the interface with high efficiency and resolution.

关键词： shallow water equations with porosity source term," Roe-type Riemann solver," finitevolume method unstructured grid

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Design of an L1 band low noise single-chip GPS receiver in 0.18 μm CMOS technology

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The Journal of China Universities of Posts and Telecommunications 2010年第3期17卷 60-65页

作者： CHEN Ying-mei li zhi-qun wang zhi-gong JING Yong-kang ZHANG li Institute of Radio Frequency and Electronic Integrated Circuits Southeast University Nanjing 210096 China

This article presents an L1 band low noise integrated global positioning system （GPS） receiver chip using 0.18 μm CMOS technology. Dual-conversion with a low-IF architecture was used for this GPS receiver. The receiver is composed of low noise amplifier （LNA）, down-conversion mixers, band pass filter, received signal strength indicator, variable gain amplifier, programmable gain amplifier, ADC, PLL frequency synthesizer and other key blocks. The receiver achieves a maximum gain of 105 dB and noise figure less than 6 dB. The variable gain amplifier （VGA） and programmable gain amplifier （PGA） provide gain control dynamic range over 50 dB. The receiver consumes less than 160 mW from a 1.8 V supply while occupying a 2.9 mm2 chip area including the ESD I/O pads.

关键词： CMOS RF receiver GPS low IF satellite communications wireless communications

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A Luminescent Cd(Ⅱ) Coordination Polymer Constructed from Isophthalic Acid and 1,3-Bis-(4-pyridyl)propane

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Chinese Journal of Structural Chemistry 2015年第6期34卷 925-930页

作者： XU Bo li zhi-wang JIANG Yang li Cun-Cheng Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong (University of Jinan) School of Chemistry and Chemical Engineering University of Jinan

A new coordination complex [Cd2（ip）2（bpp）]n （1, H2ip = isophthalic acid, bpp = 1,3-bis-（4-pyridyl） propane） has been synthesized and structurally characterized. Crystal data for the title complex are as follows： triclinic system, space group Pi with a = 9.6724（6）, b = 10.2243（6）, c = 14.8205（9） A, a = 88.927（5）, β = 71.664（6）, ）, = 75.767（5）°, F= 1345.79（14） A3, Mr = 751.29, Z= 2, F（000） = 740, Dc = 1.854 g/cm^3,μ（MoKa） = 1.636 mm^-1, R = 0.0259 and wR = 0.0623 for 4754 observed reflections with I 〉 20（0. X-ray structure analysis reveals that complex 1 holds a 3D architecture based on a-Po primitive cubic units with the [Cd4（COO）8] units treated as 6-connected nodes. Solid-state properties for 1, such as infrared spectroscopy, elemental analyses, thermal stability and luminescent property, have also been investigated.

关键词： coordination polymer crystal structure luminescence mixed-ligand approach

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Tensile reliability analysis for gravity dam foundation surface based on FEM and response surface method

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Water Science and Engineering 2010年第2期3卷 233-240页

作者： Tong-chun li Dan-dan li zhi-qiang wang College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 P. R. China

In this study, the limit state equation for tensile reliability analysis of the foundation surface of a gravity dam was established. The possible crack length was set as the action effect and allowable crack length was set as the resistance in the limit state. The nonlinear FEM was used to obtain the crack length of the foundation surface of the gravity dam, and the linear response surface method based on the orthogonal test design method was used to calculate the reliability, providing a reasonable and simple method for calculating the reliability of the serviceability limit state. The Longtan RCC gravity dam was chosen as an example. An orthogonal test, including eleven factors and two levels, was conducted, and the tensile reliability was calculated. The analysis shows that this method is reasonable.

关键词： tensile reliability foundation surface of gravity dam nonlinear FEM," response surface method," Longtan RCC gravity dam

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Graphdiyne(C_(n)H_(2n-2))as an"electron transfer bridge"boosting photocatalytic hydrogen evolution over Zn_(0.5)Co_(0.5)S/MoS_(2)S-scheme heterojunction

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Rare Metals 2024年第5期43卷 1999-2014页

作者： Mei li Jing-zhi wang zhi-liang Jin School of Chemistry and Chemical Engineering North Minzu UniversityYinchuan 750021China School of Chemistry and Chemical Engineering Ningxia Key Laboratory of Solar Chemical Conversion TechnologyKey Laboratory for Chemical Engineering and TechnologyState Ethnic Affairs CommissionNorth Minzu UniversityYinchuan 750021China

In the process of photocatalytic water cracking,the migration rate and utilization rate of photogenerated charges determine the hydrogen evolution performance of the *** this paper,a carbon isotope superconducting material graphdiyne(GDY)is prepared by mechanical ball milling and introduced into the S-scheme heterojunction Zn_(0.5)Co_(0.5)S/MoS_(2)inorganic *** terms of hydrogen evolution kinetics,GDY acts as an electron bridge,not only accelerating the migration of photogenerated carriers but also improving the utilization of photogenerated ***,the large twodimensional layer provides more loading and anchoring points for Zn_(0.5)Co_(0.5)S/MoS_(2),which increases the number of active *** ternary composite catalyst 20%GDY/Zn_(0.5)Co_(0.5)S/MoS_(2)(20-GCSM)generates 69.94μmol of hydrogen(5 h)in triethanolamine *** is 2.97 and1.80 times higher than Zn_(0.5)Co_(0.5)S and Zn_(0.5)Co_(0.5)S/MoS_(2),*** the cyclic experiment,it still has stable hydrogen evolution performance after standing for24 h(under dark conditions).In addition,the potential mechanism of photocatalytic hydrogen evolution is demonstrated through in-situ X-ray photoelectron *** work provides a reference for further research in the field of introducing carbon materials into photocatalytic systems and improving the utilization of photogenerated charges.

关键词： Graphdiyne S-scheme heterojunction Electron transfer bridge Hydrogen production

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Continuous positive airway pressure in children with severe pneumonia: a meta-analysis

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World Journal of Pediatrics 2020年第6期16卷 637-641页

作者： zhi-li wang Yu He Zheng-Xiu Luo Chongqing Key Laboratory of Pediatrics Department of RespiratoryMinistry of Education Key Laboratory of Child Development and DisordersNational Clinical Research Center for Child Health and Disorders(Chongqing)China International Science and Technology Cooperation Base of Child Development and Critical DisordersChildren's Hospital of Chongqing Medical UniversityChongqing 400014China

Pneumonia is the leading cause of death among children aged 1-59 months worldwide[1].WHO recommends providing low flow oxygen by nasal cannula in pediatric patients with oxygen saturation<90%[2].With the provision of oxygen supplementation,some children still require further respiratory support such as mechanical ventilation due to the failure to maintain oxygen saturation and severe respiratory distress[3,4].However,mechanical ventilation may result in ventilator-induced lung injury[5].As a simple and minimally invasive technique,continuous positive airway pressure(CPAP)has been used in children with severe pneumonia[6,7],but its effect and safety are ***,we performed a meta-analysis that compared CPAP with standard therapy or low-flow oxygen to figure out the effects and safety of CPAP.

关键词： airway pneumonia distress

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Retrieval of multiple scattering contrast from x-ray analyzer-based imaging

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Chinese Physics B 2021年第1期30卷 600-604页

作者： Heng Chen Bo liu li-Ming Zhao Kun Ren zhi-li wang School of Electronics Science&Applied Physics Hefei University of TechnologyHefei 230009China

We present a moment-based alternative approach to retrieve multiple scattering contrasts from x-ray analyzer-based imaging. By use of the properties of moments of convolutions, the multiple-image radiography approach is theoretically validated. Furthermore, higher order moments of the object scattering distribution, inaccessible in multiple-image radiography, are simultaneously provided by this alternative approach. It is experimentally demonstrated that the skew and kurtosis information related to the distribution of sub-pixel features within the object can be obtained from those complementary contrasts. Finally, the sensitivity of the retrieved multiple scattering contrasts is investigated experimentally. The finding that the sensitivity is inversely proportional to the square root of the detected photon number essentially indicates that the retrieval of moments with an order higher than two can be achieved without increasing exposure time or dose. The presented alternative approach provides an access to the exploitation of multiple scattering contrasts, which is expected to be useful in biomedical research, materials science, security screening, etc.

关键词： x-ray imaging analyzer-based imaging rocking curve moment analysis

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Mathematical Analysis on a General Delayed HBV Model with Capsids and Two Infection Routes

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 508-525页

作者： li-li liU Hong-gang wang Ya-zhi li Shanxi Key Laboratory of Mathematical Techniques and Big Data Analysis on Disease Control and Prevention Complex Systems Research CenterShanxi UniversityTaiyuan 030006China School of Mathematics and Statistics Qiannan Normal University for NationalitiesDuyun 558000China

Considering that HBV belongs to the DNA virus family and is hepatotropic,we model the HBV DNA-containing capsids as a *** this paper,a delayed HBV infection model is established,where the general incidence function and two infection routes including cell-virus infection and cell-cell infection are *** to some preliminaries,including well-posedness,basic reproduction number and existence of two equilibria,we obtain the threshold dynamics for the *** illustrate numerical simulations to verify the above theoretical results,and furthermore explore the impacts of intracellular delay and cell-cell infection on the global dynamics of the model.

关键词： delayed HBV model capsids general incidence function two infection routes global stability

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Output speed and flow of double-acting double-stator multi-pumps and multi-motors

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第4期12卷 301-309页

作者： De-sheng WEN zhi-li wang Jun GAO Yong ZHANG Shi-jun LV Tetsuhiro TSUKIJI College of Mechanical Engineering Yanshan University Qinhuangdao 066004 China College of Engineering and Applied Science Sophia University Tokyo 102-8554 Japan

The primary focus of this study was to investigate a series of novel motors and pumps,based on a new type of structure called *** double-stator structure can be used as pump or motor just based on the application requirements.A certain amount of pumps or motors can be formed in one shell,and these sub-pumps or sub-motors can work alone or be combined without influence on each *** this kind of double-stator pump(motor) is called a multi-pump(multi-motor).Through the analysis of multifarious connection modes of the double-acting double-stator multi-pumps and multi-motors,the mathematical expressions of the output flow rate and the rotational speed are *** results indicate that a quantity of different flow rates can be provided by one fixed-displacement multi-pump under the condition of unalterable driven speed by ***,when supplied by settled input flow,without complex variable mechanism,the functions of double-speed,multiple-speed,and even differential connection can be obtained by employing the use of a double-stator *** novel hydraulic transmission is made of such a double-stator multi-pump and multi-motor,and has broad application prospects.

关键词： Multi-pumps Multi-motors Flow rate Rotational speed Hydraulic transmission Differential motor

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