检索结果-南通市图书馆

Land-atmosphere feedbacks weaken the risks of precipitation extremes over Australia in a warming climate

在线全文

学校读者我要写书评

暂无评论

Advances in Climate change Research 2024年第5期15卷 859-868页

作者： Mei-yu chang Zhi-Yan ZUO Liang QIAO kai-Wen ZHANG Bo LIU Key Laboratory of Polar Atmosphere-Ocean-Ice System for Weather and Climate of Ministry of Education/Shanghai Key Laboratory of Ocean-Land-Atmosphere Boundary Dynamics and Climate change Department of Atmospheric and Oceanic Sciences/lnstitute of Atmospheric SciencesFudan UniversityShanghai 200438China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China Department of Atmospheric Science School of Environmental StudiesChina University of GeosciencesWuhan 430074China

The importance of land-atmosphere feedbacks on regional precipitation changes has been recently ***,how land-atmosphere feedbacks shape daily precipitation distributions,particularly the tails of precipitation distributions associated with extreme events,remains unclear on a regional ***,using the latest land-atmosphere coupling experiments,this study reveals a consistent weakening effect of land-atmosphere feedbacks on the future increase in precipitation extremes over Australia,revealing the most pronounced reduction(56.8%)for the long-term(2080-2099)projection under the low emission(SSP1-2.6)*** weakening effect holds true for shifts in the extreme tail of precipitation distribution,resulting in a reduced risk of precipitation extremes in a warming ***-atmosphere feedbacks offset 28%-60%of the occurrence risk for the 99th percentile of daily precipitation,with the largest reduction of 172%when precipitation exceeds the 99.7th percentile in the long-term projection under the high emission(SSP5-8.5)*** less water replenishment,these feedbacks may reduce the risk of flooding but potentially expedite droughts,highlighting the role of land-atmosphere feedbacks in extreme event pro-jectionand regional climate adaptation.

关键词： Land-atmosphere feedbacks Extreme precipitation Australia Precipitation distribution

Chiral Anomaly-Enhanced Casimir Interaction between Weyl Semimetals

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第8期38卷 57-61页

作者： Jia-Nan Rong Liang Chen kai chang SKLSM Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Mathematics and Physics North China Electric Power UniversityBeijing 102206China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We theoretically study the Casimir interaction between Weyl *** the distance a between semiinfinite Weyl semimetals is in the micrometer regime,the Casimir attraction can be enhanced by the chiral *** Casimir attraction depends sensitively on the relative orientations between the separations(b1,b2)of Weyl nodes in the Brillouin zone and show anisotropic behavior for the relative orientation of these separations(b1,b2)when they orient parallel to the *** anisotropy is quite larger than that in conventional birefringent *** Casimir force can be repulsive in the micrometer regime if the Weyl semimetal slabs are sufficiently thin and the direction of Weyl nodes separations(b1,b2)is perpendicular to the *** Casimir attraction between Weyl semimetal slabs decays slower than 1/a4 when the Weyl nodes separations b1 and b2 are both parallel to the interface.

关键词： materials separation attraction

Isolation of a New PAK1 Gene from Sea Cucumber(Apostichopus japonicus) and Its Expression Analysis and Function Characterization

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2019年第5期18卷 1147-1157页

作者： REN Liyuan LI kaiquan ZHAN Yaoyao WANG Yi yu Yao CHEN Yang LIN kai SONG Jian chang Yaqing Key Laboratory of Mariculture & Stock Enhancement in North China’s Sea of Ministry of Agriculture and Rural Affairs Dalian Ocean UniversityDalian 116023China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China The University of New South Wales SydneyNew South Wales 2052Australia

The p21-activated kinase 1(PAK1)is a downstream serine/threonine kinase effector of Rac1/Cdc42 that regulates various biological processes including those associating with pathological *** investigate the function of PAK1 in echinoderms,we isolated a new PAK1 from sea cucumber Apostichopus japonicus(AjPAK1)by transcriptome database mining and with rapid amplification of cDNA ends(RACE).The full-length cDNA AjPAK1 was 2303 bp in length,containing a 1587 bp ORF encoding 528 amino acid *** deduced AjPAK1 contained a p21-Rho-binding domain(PBD)and a serine/threonine protein kinase catalytic domain(S_TKc),which was similar to the PAK1 of crown-of-thorns starfish Acanthaster planci and other ***1 expressed in all tissues of adult *** analyzed with the highest transcript anumdance detected in *** change in AjPAK1 abundance was observed at 4,24,48 and 72 h after Vibrio splendidus *** AjPAK1 induced a significant reduction of lysozyme content in coelomic fluid and relative transcript abundances of AjRac1 and AjMKK3/6 in *** *** results should aid to characterize PAK1 of sea cucumber and decipher its immune function.

关键词： Apostichopus japonicus PAK1 expression analysis Vibrio splendidus infection

Nψ,φ-type Quotient Modules over the Bidisk

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2020年第8期36卷 943-960页

作者： chang Hui WU Tao yu School of Mathematical Sciences Qufu Normal UniversityQufu 273165P.R.China School of Mathematical Sciences Dalian University of TechnologyDalian 116024P.R.China

Let H^2(D^2)be the Hardy space over the bidisk D^2,and let Mψ,φ=[(ψ(z)-φ(w))^2]be the submodule generated by(ψ(z)-φ(w))2,whereψ(z)andφ(w)are nonconstant inner *** related quotient module is denoted by Nψ,φ=H^2(D^2)ΘMψ,φ.In this paper,we give a complete characterization for the essential normality of Nψ,φ.In particular,ifψ(z)=z,we simply write Mψ,φand Nψ,φas Mφand Nφ*** paper also studies compactness of evaluation operators L(0)|Nφand R(0)|Nφ,essential spectrum of compression operator Sz on Nφ,essential normality of compression operators Sz and Sw on Nφ.

关键词： Quotient module compression operators essential normality

Active compliance and force estimation of a continuum surgical manipulator based on the tip-pose feedback

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第9期66卷 2517-2529页

作者： WU BaiBo ZHOU chang WANG Xiang SUN DaWei XU kai School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Gynaecology and Obstetrics Peking Union Medical College HospitalBeijing 100730China

Continuum manipulators have been applied in different surgical scenarios due to their dexterity and multi-DoF(degree of freedom)design *** improve surgery safety,it is preferable to enable active compliance and force sensing abilities for a continuum *** works on active compliance and force sensing often rely on force sensors at the proximal or the distal ends,which inevitably increases the system *** this paper,a shape reconstruction algorithm,a compliant motion controller,and a force estimation method are proposed successively based on the manipulator's tip pose via visual *** support vector regression(SVR)trainers are constructed and trained to compensate for the actuation residues,which are the differences between the actual actuation lengths outputs at the actuators and the ideal actuation lengths calculated from the estimated shape using the kinematics model,under no-load ***,a compliant motion controller and a force estimation method are realized based on the current actuation residues,compared with the actuation residues under the no-load *** this way,no additional sensors are needed as an endoscopic camera is often available in a laparoscopic or endoscopic surgical *** experiments were conducted on aφ3 mm-continuum manipulator to demonstrate the effectiveness of the proposed algorithms.

关键词： continuum manipulator vision feedback shape reconstruction compliant motion control force estimation

Computational investigation of hydrodynamics and cracking reaction in a heavy oil riser reactor

在线全文

学校读者我要写书评

暂无评论

Particuology 2012年第2期10卷 184-195页

作者： Jian chang kai Zhang Fandong Meng Longyan Wang Xiaoli Wei State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Luoyang Petrochemical Engineering Corporation SINOPEC Luoyang 471003China Sixth Community of Zhongyuan Oilfield Company SINOPECPuyang 475300China

This paper presents a computational investigation of hydrodynamics, heat transfer and cracking reaction in a heavy oil riser operated in a novel operating mode of low temperature contact and high catalyst-to-oil ratio. Through incorporating feedstock vaporization and a 12-lump cracking kinetics model, a validated gas-solid flow model has been extended to the analysis of the hydrodynamic and reaction behavior in an industrial riser. The results indicate that the hydrodynamics, temperature and species concentration exhibit significantly nonuniform behavior inside the riser, especially in the atomization nozzle region. The lump concentration profiles along the riser height provide useful information for riser optimization. Compared to conventional fluid catalytic cracking （FCC） process, feedstock conversion and gasoline yield are respectively increased by 1.9 units and 1.0 unit in the new FCC process, the yield of liquefied petroleum gas is increased by about 1.0 unit while dry gas yield is reduced by about 0.3 unit.

关键词： HydrodynamicsCracking reactionRiserCFDLow temperature contactHigh catalyst-to-oil ratio

Glutamic acid-assisted hydrothermal recrystallization to configure bamboo-like carbon nanotubes for improved triiodide reduction

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第9期34卷 159-167页

作者： Chun Yao Jiangwei chang Yiwang Ding chang yu Jieshan Qiu State Key Laboratory of Fine Chemicals Liaoning Key Laboratory for Energy Materials and Chemical EngineeringSchool of Chemical EngineeringDalian University of TechnologyDalian 116024China

Carbon nanotubes(CNTs)have been far and wide employed as the counter electrodes(CEs)in dyesensitized solar cells because of their individual physical and chemical ***,the techniques available now,such as chemical vapor deposition,arc discharge and laser ablation for synthesizing CNTs,commonly suffer from rigorous operations and complicated steps,which make the process difficult to be ***,we present a simple and facile glutamic acid-assisted hydrothermal recrystallization strategy to construct bamboo-like CNTs(GHP-BC-x).Generally,the conventional organic dye3,4,9,10-perylene tetracarboxylic dianhydride(PTCDA)is used as a precursor and glutamic acid efficiently promotes the recrystallization of the perylene cores'planarπ-conjugated system in PTCDA under hydrothermal conditions and then self-assembles into one-dimensio nal nano rods with improved crystallization degree,finally resulting in the morphology of bamboo-like CNTs after *** applied as the counter electrodes,the GHP-BC-3 displays a remarkable power conversion efficiency of8.25%,benefiting from the superb electrical conductivity and mass transfer dynamics,superior to that of Pt CE(7.62%).

关键词： Hydrothermal recrystallization Bamboo-like carbon nanotubes Counter electrodes Electrocatalysis Triiodide reduction

Pauli blocking potential applied to heavy-ion fusion reactions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第2期46卷 122-130页

作者： kai-Xuan Cheng chang Xu Chun-Wang Ma Jie Pu yu-Ting Wang School of Physics Henan Normal UniversityXinxiang 453007China School of Physics Nanjing UniversityNanjing 210008China

In this study,the Pauli blocking potential between two colliding nuclei in the density overlapping regionis applied to describe the heavy nuclei fusion *** by the Pauli blocking effect in theα-decay of heavynuclei,the Pauli blocking potential of single nucleon from the surrounding matter is *** fusion reactionswith strong density overlap,the Pauli blocking potential between the projectile and target can be constructed using asingle folding *** considering this potential,the double folding model with a new parameter set is employedto analyze the fusion processes of 95 systems.A wider Coulomb barrier and shallower potential pocket are formed inthe inner part of the potential between the two colliding nuclei,compared to that calculated using the Akyüz-Win-ther *** fusion hindrance phenomena at deep sub-barrier energies are described well for fusion systems^(16)O+^(208)Pb and^(58)Ni+^(58)Ni.

关键词： Pauli blocking effect double folding model fusion hindrance

An Exposure Meter of Lijiang Fiber-fed High-Resolution Spectrograph

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2023年第11期23卷 60-66页

作者： Xiao-Guang yu kai-Fan Ji Xi-Liang Zhang Liang chang yun-Fang Cai Ying Qin Zhen-Hong Shang yunnan Observatories Chinese Academy of SciencesKunming 650011China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China University of Chinese Academy of Sciences Beijing 100049China Faculty of Information Engineering and Automation Kunming University of Science and TechnologyKunming 650500China

In 2016,an exposure meter was installed on the Lijiang Fiber-fed High-Resolution Spectrograph to monitor the coupling of starlight to the science fiber during *** on it,we investigated a method to estimate the exposure flux of the CCD in real time by using the counts of the photomultiplier tubes(PMT)of the exposure meter,and developed a piece of software to optimize the control of the exposure ***,by using flat-field lamp observations,we determined that there is a linear and proportional relationship between the total counts of the PMT and the exposure flux of the ***,using historical observations of different spectral types,the corresponding relational conversion factors were determined and obtained ***,the method was validated using actual observation data,which showed that all values of the coefficient of determination were greater than ***,software was developed to display the counts of the PMT and the estimated exposure flux of the CCD in real-time during the observation,providing a visual reference for optimizing the exposure time control.

关键词： telescopes instrumentation:spectrographs instrumentation:photometers