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Air temperature feedback and its contribution to global warming

Science China Earth Sciences 2018年第10期61卷 1491-1509页

作者： Xiaoming hu ming CAI Song YANG Sergio A.SEJAS School of Atmospheric Sciences Sun Yat-sen University Guangzhou 510275 China Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Guangzhou 510275 China Department of Earth Ocean and Atmospheric Sciences Florida State University Tallahassee 32306 USA Institute of Earth Climate and Environment System Sun Yat-sen University Guangzhou 510275 China NASA Langley Research Center Climate Science Branch Hampton 03842 USA

Air temperature feedback results from the thermal-radiative coupling between the atmosphere and the surface and plays an important role in surface energy balance. This paper reveals the contribution of air temperature feedback to the global warming from 1980 to 2000. The air temperature feedback kernel, evaluated using the ERA-Interim reanalysis data, is used to discuss the physical mechanism for air temperature feedback, the dependency of the strength of air temperature feedback on the climatological spatial distributions of air temperature, water vapor and cloud content, and the contributions of air temperature feedback to rapid global warming. The coupling between temperature feedback and each of the external forcings and individual feedback processes will amplify the anomaly of direct energy flux convergence at the surface induced by the external forcings and individual processes. The air temperature feedback amplifies the initial surface warming due to the increase in CO2 concentration, ice and snow melting, increase in water vapor, and change in ocean heat storage. It also amplifies the surface warming due to the longwave radiaitve forcing associated with the increase in cloud cover, which acts to suppress the cooling of the shortwave effect of cloud forcing. Overall, temperature feedback plays an important role in the global warming from 1980 to2000, as the net positive contribution to the perturbation of global mean energy flux at the surface from the air temperature feedback is larger than the net negative contribution from external forcing and all non-temperature feedbacks.

关键词： Global warming Air temperature feedback Surface energy budget

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Facial Image Attributes Transformation via Conditional Recycle Generative Adversarial Networks

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Journal of Computer Science & Technology 2018年第3期33卷 511-521页

作者： huai-Yu Li Wei-ming Dong Bao-Gang hu National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

This study introduces a novel conditional recycle generative adversarial network for facial attribute transfor- mation, which can transform high-level semantic face attributes without changing the identity. In our approach, we input a source facial image to the conditional generator with target attribute condition to generate a face with the target attribute. Then we recycle the generated face back to the same conditional generator with source attribute condition. A face which should be similar to that of the source face in personal identity and facial attributes is generated. Hence, we introduce a recycle reconstruction loss to enforce the final generated facial image and the source facial image to be identical. Evaluations on the CelebA dataset demonstrate the effectiveness of our approach. Qualitative results show that our approach can learn and generate high-quality identity-preserving facial images with specified attributes.

关键词： generative adversarial network image editing facial attributes transformation

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A Quasi-Linear Relationship between Planetary Outgoing Longwave Radiation and Surface Temperature in a Radiative-Convective-Transportive Climate Model of a Gray Atmosphere

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Advances in Atmospheric Sciences 2024年第1期41卷 8-18页

作者： Jie SUN Michael SECOR ming CAI Xiaoming hu Department of Earth Oceanand Atmospheric ScienceFlorida State UniversityTallahasseeFlorida 32304USA School of Atmospheric Sciences Sun Yat-sen University and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Zhuhai 519082China

In this study,we put forward a radiative-convective-transportive energy balance model of a gray atmosphere to examine individual roles of the greenhouse effect of water vapor,vertical convection,and atmospheric poleward energy transport as well as their combined effects for a quasi-linear relationship between the outgoing longwave radiation(OLR)and surface temperature(T_(S)).The greenhouse effect of water vapor enhances the meridional gradient of surface temperature,thereby directly contributing to a quasi-linear OLR-T_(S) *** atmospheric poleward energy transport decreases the meridional gradient of surface *** a result of the poleward energy transport,tropical(high-latitude)atmosphere-surface columns emit less(more)OLR than the solar energy input at their respective locations,causing a substantial reduction of the meridional gradient of the *** combined effect of reducing the meridional gradients of both OLR and surface temperature by the poleward energy transport also contributes to the quasi-linear OLR-T_(S) *** convective energy transport reduces the meridional gradient of surface temperature without affecting the meridional gradient of OLR,thereby suppressing part of the reduction to the increasing rate of OLR with surface temperature by the greenhouse effect of water vapor and poleward energy *** of the nature of the energy balance in the climate system,such a quasi-linear relationship is also a good approximation for the relationship between the annual-mean net downward solar energy flux at the top of the atmosphere and surface temperature.

关键词： outgoing longwave radiation greenhouse effect poleward energy transport

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Recent advances in gold-complex and chiral organocatalyst cooperative catalysis for asymmetric alkyne functionalization

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Chinese Chemical Letters 2022年第12期33卷 4969-4979页

作者： ming Bao Su Zhou Wenhao hu Xinfang Xu Guangdong Key Laboratory of Chiral Molecule and Drug Discovery School of Pharmaceutical SciencesSun Yat-sen UniversityGuangzhou 510006China

Homogeneous gold catalysis has demonstrated the preponderant capability of realizing a broad range of synthetically versatile alkyne functionalization over the last two *** catalytic asymmetric alkyne transformation has focused on the principle of using gold catalysts either associated with chiral phosphine ligand or combined with chiral counterion,a variety of breakthroughs have been reported with the application of gold-complex and chiral organocatalyst cooperative catalysis strategy,which could enable the challenging transformations that cannot be realized by mono-catalysis with excellent *** review will cover two general protocols in this field,including relay catalysis and synergistic catalysis,with emphasis on the detailed cooperative catalysts models to illustrate the roles of the two catalysts and highlight the potential synthetic opportunities offered by asymmetric cooperative catalysis.

关键词： Gold catalysis Chiral organocatalyst catalysis Relay catalysis Synergistic catalysis Asymmetric alkyne functionalization

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Recursive calibration for a lithium iron phosphate battery for electric vehicles using extended Kalman filtering

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第11期12卷 818-825页

作者： Xiao-song hu Feng-chun SUN Xi-ming CHENG National Engineering Laboratory for Electric Vehicles Department of Mechanical EngineeringBeijing Institute of Technology Beijing 100081 China

In this paper,an efficient model structure composed of a second-order resistance-capacitance network and a simply analytical open circuit voltage versus state of charge(SOC) map is applied to characterize the voltage behavior of a lithium iron phosphate battery for electric vehicles(EVs).As a result,the overpotentials of the battery can be depicted using a second-order circuit network and the model parameterization can be realized under any battery loading profile,without a special characterization *** order to ensure good robustness,extended Kalman filtering is adopted to recursively implement the calibration *** linearization involved in the calibration algorithm is realized through recurrent derivatives in a recursive *** results show that the recursively calibrated battery model can accurately delineate the battery voltage behavior under two different transient power operating conditions.A comparison with a first-order model indicates that the recursively calibrated second-order model has a comparable accuracy in a major part of the battery SOC range and a better performance when the SOC is relatively low.

关键词： Model calibration Lithium iron phosphate battery Electric vehicle (EV) Extended Kalman filtering

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Improving bubble-particle attachment during the flotation of low rank coal by surface modification

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International Journal of Mining Science and Technology 2020年第2期30卷 217-223页

作者： Haishan hu ming Li Lulu Li Xiuxiang Tao School of Chemical Engineering&Technology China University of Mining and TechnologyXuzhou 221116China National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China

Based on the problems caused by many oxygen-containing functional groups and poor floatability on the surface of low rank coal,the characteristics of low rank coal were analyzed systematically by means of scanning electron microscopy(SEM),X-ray diffraction(XRD)and X-Ray photoelectron spectroscopy(XPS)*** bubble-particle induction time was used to determine the characterization of the bubble-particle attachment,and the bubble-particle attachment of low rank coal modified by soaking the coal samples in an acid or alkaline solution was *** floatability of the modified coal surface was verified by flotation *** results show that the particle size of 0.125–0.074 mm of the coal sample exhibited better bubble-particle attachment *** small bubble,the larger approach velocity of bubble and the larger bubble deformation were more helpful to enhance the bubbleparticle *** an acid solution,the smaller the p H was and the longer the soaking time was,the better the floatability of the coal sample and the higher the combustible material recovery *** combustible material recovery of low rank coal was increased to 78.79%by soaking the sample in an acid solution of pH=0 for 180 *** the contrary there was a best concentration for the alkaline solution.

关键词： Low rank coal Induction time Modification Flotation Bubble-particle attachment

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Functional role of ATM in the cellular response to DNA damage

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Frontiers of Chemical Science and Engineering 2011年第2期5卷 179-187页

作者： ming LIU Wenxiang hu College of Life Science Capital Normal UniversityBeijing 100048China Institute of Physical Organic and Medicinal Chemistry Capital Normal UniversityBeijing 100048China

Ataxia-telangiectasia mutated(ATM)plays a key role in regulating the cellular response to ionizing *** tumor-suppressor gene ATM,mutations in which cause the human genetic disease ataxia telangiecta-sia,encodes a key protein kinase that controls the cellular response to double-stranded *** of ATM results in phosphorylation of many downstream targets that modulate numerous damage response pathways,most notably cell cycle ***,we highlight some of the new developments in theﬁeld in our understanding of the mechanism of activation of ATM and its signaling pathways,explore whether DNA double-strand breaks are the sole activators of ATM and ATM-dependent signaling pathways,and address some of the prominent,unanswered questions related to ATM and its *** scope of this article is to provide a brief overview of the recent literature on this subject and to raise questions that could be addressed in future studies.

关键词： ataxia-telangiectasia mutated(ATM) cell cycle checkpoint DNA damage signalling transduction

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Evaluation of vibration stress of TA11 titanium alloy blade by quantitative fractography

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Rare Metals 2014年第3期33卷 263-269页

作者： Xin-Ling Liu Yuan-ming Xu Chun-hu Tao Beijing Institute of Aeronautical Materials Aviation Industries of China Key Laboratory of Aeronautical Materials Testing and Evaluation ChinaTao Failure Analysis Center of Aviation Industries of China School of Aeronautical Science and Engineering Beijing University of Aeronautics and Astronautics Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation

Vibration fatigue is the main failure mode of compressor blade. Evaluating the vibration stress of blade that leads to cracking is very useful for analysis of vibration fatigue. In this paper, fatigue stress estimation methods by quantitative fractography were studied through experimental blade and in-service first-stage compressor blade in order to evaluate the initiation vibration stress of in-service blade. The analysis process of initiation vibration stress was established. The evaluating result of vibration stress of in-service blade subjected to centrifugal force and bending vibration stress agrees with aero engine test result. It is shown that the evaluation method can not only evaluate the equivalent fatigue stresses of different crack depths but also yield the initiation equivalent fatigue stress.

关键词： Compressor blade Bending vibration Stress evaluate Quantitative fractography

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Integrated transcriptome and physiology analysis of Microcystis aeruginosa after exposure to copper sulfate

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Journal of Oceanology and Limnology 2020年第1期38卷 102-113页

作者： WANG Tao hu Yadong Zhu ming YIN Shaowu College of Marine Science and Engineering College of Life ScienceNanjing Normal UniversityNanjing 210023China Co-Innovation Center for Marine Bio-Industry Technology of Jiangsu Province Lianyungang 222005China College of Marine Life and Mariculture Huaihai Institute of TechnologyLianyungang 222005China Nanjing Ocean-wisdom Biotech Company Nanjing 211132China

Copper sulfate(CuSO4)is widely used in controlling the Microcystis aeruginosa *** studies reported the toxicity mechanisms of Cu^2+to *** at the physiological level,but little is known about a transcriptomic basis of these *** the present study,*** was treated by 0.5 mg/L Cu^2+(half of the 96-h EC50)for 72 *** results show that CH2+content in *** increased after 72 h Cu^2+exposure,whereas the Fv/Fm chlorophyll fluorescence value and chlorophyll a content in *** sharply *** oxygen species concentration and activity of antioxidant enzymes(superoxide dismutase,catalase and peroxidase)were all *** physiological data confirmed toxicity of Cu^2+to *** RNA-seq analysis showed that 6646725 and 7880291 clean reads were obtained for the Cu-treated and control libraries,*** 595 genes(252 downward trend and 343 upward trend)with the Gene Ontology(GO)annotations were divided into three main functional categories:cellular component,molecular function,and biological *** the Cluster of Orthologous Groups(COG)annotation,418 differentially expressed genes with 25 functional definitions were *** them,‘replication,recombination and repair’,‘energy production and conversion’,and‘general function prediction only’were the largest three groups of *** the Kyoto Encyclopedia of Genes and Genomes(KEGG)pathway analysis,genes involved in photosynthesis and oxidative phosphorylation were present at the highest *** addition,the genes involved in photosynthesis and oxidative phosphorylation were identified,and then confirmed using real-time *** study reported the first transcriptome of *** and oxidative phosphorylation were severely affected by Cu^2+toxicity,which may have contributed to cell *** data provide the potential mechanism to explain the CuSO4 effect on the harmful ***.

关键词： transcriptome physiology Microcystis aeruginosa copper sulfate

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Edge Video CDN： A Wi-Fi Content Hotspot Solution

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Journal of Computer Science & Technology 2016年第6期31卷 1072-1086页

作者： Wen hu Zhi Wang ming Ma Li-Feng Sun Tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing 100084 China Department of Computer Science and Technology Tsinghua University Beijing 100084 China Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China

The emergence of smart edge-network content item hotspots, which are equipped with huge storage space （e.g., several GBs）, opens up the opportunity to study the possibility of delivering videos at the edge network. Different from both the conventional content item delivery network （CDN） and the peer-to-peer （P2P） scheme, this new delivery paradigm, namely edge video CDN, requires up to millions of edge hotspots located at users＇ homes/offices to be coordinately managed to serve mobile video content item. Specifically, two challenges are involved in building edge video CDN, including how edge content item hotspots should be organized to serve users, and how content items should be replicated to them at different locations to serve users. To address these challenges, we propose our data-driven design as follows. First, we formulate an edge region partition problem to jointly maximize the quality experienced by users and minimize the replication cost, which is NP-hard in nature, and we design a Voronoi-like partition algorithm to generate optimal service cells. Second, to replicate content items to edge-network content item hotspots, we propose an edge request prediction based replication strategy, which carries out the replication in a server peak offioading manner. We implement our design and use trace-driven experiments to verify its effectiveness. Compared with conventional centralized CDN and popularity-based replication, our design can significantly improve users＇ quality of experience, in terms of users＇ perceived bandwidth and latency, up to 40%.

关键词： video content item delivery network (CDN) edge network content item hotspot

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