检索结果-南通市图书馆

Patterns of Emergent Nonlinear Waves in an Initial Discontinuity Problem of the Bad Jaulent-Miodek Equation

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2024年

作者： ya-qing LIU bo-ling GUO Deng-shan WANG School of Applied Science Beijing Information Science and Technology University Institute of Applied Physics and Computational Mathematics Beijing Laboratory of Mathematics and Complex Systems (Ministry of Education) School of Mathematical Sciences Beijing Normal University

By means of the Whitham modulation theory, this paper studies the discontinuous initial value problem of the bad Jaulent-Miodek(JM) equation, which is compared with the good JM equation. The linear stability of the good and bad JM equations is analyzed to show the difference between the two equations. Also the physical significance of the JM equations is discussed by considering the reduction of the Euler's *** the zero-, one-, two-phase periodic solutions and the corresponding Whitham equations in the framework of the bad JM equation are derived by finite-gap integration approach. The degeneration of the one-phase periodic solution along with the genus-one Whitham equation are analyzed by taking the two sides limits of the modulus m of the Jacobi elliptic functions. The basic rarefaction wave patterns and dispersive shock wave patterns are proposed analytically and graphically, and then the complete classification of solutions and the all possible waveforms evolving from discontinuous initial values in the bad JM equation are established. In the results, various patterns of emergent nonlinear waves that appear to be new and are being detected for the first time.

关键词：

Highly efficient photo-thermal synergistic catalysis of CO_(2)methanation over La_(1-x)Ce_(x)NiO_(3)perovskite-catalyst

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 7945-7956页

作者： Ting Li Zhen-yu Zhang De-Cun Luo bo-yu Xu Rong-Jiang Zhang Ji-Long yao Dan Li Tao Xie Institute of Industrial Catalysis School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049China

Solar-driven photo-thermal catalytic CO_(2)methanation reaction is a promising technology to alleviate the problems posed by greenhouse gases ***,designing advanced photo-thermal catalysts remains a research challenge for CO_(2)methanation *** this work,a series of Abo3(A=lanthanide,B=transition metal)perovskite catalysts with Ce-substituted LaNiO3(La_(1-x)Ce_(x)NiO_(3),x=0,0.2,0.5,0.8,1)were synthesized for CO_(2)*** La_(0.2)Ce_(0.8)NiO_(3) exhibited the highest CH_(4) formation rate of 258.9 mmol·g^(-1)·hcat-1,CO_(2)conversion of 55.4%and 97.2%CH_(4) selectivity at 300℃with the light intensity of 2.9 W·cm^(-2).Then the catalysts were thoroughly analyzed by physicochemical structure and optical properties *** partial substitution of the A-site provided more active sites for the adsorption and activation of CO_(2)/H_(2).The sources of the active sites were considered to be the oxygen vacancies(O_(v))created by lattice distortions due to different species of ions(La^(3+),Ce^(4+),Ce^(3+))and exsolved Ni0 by H_(2)*** catalysts have excellent light absorption absorbance and low electron-hole(e^(-)/h^(+))recombination rate,which greatly contribute to the excellent performance in photo-thermal synergistic catalysis(PTC)CO_(2)*** results of in situ irradiated electron paramagnetic resonance spectrometer(ISI-EPR)and ISI-X-ray photoelectron spectroscopy(XPS)indicated that the aggregation of unpaired electrons near the defects and Ni metal(from La and Ce ions to Ov and Ni0)accelerated adsorption and activation of CO_(2)/H_(2).At last,the catalyst properties and structure were correlated with the proposed reaction mechanism from the in situ diffuse reflection infrared Fourier transform spectrum(DRIFTS)*** in situ precipitation of the B-site enhanced the dispersion of Ni,while its enriched photoelectrons upon illumination further promote hydrogen *** H^(*)spillover accelerated t

关键词： photo-thermal catalysis CO_(2)methanation perovskite A-site substitution in situ diffuse reflection infrared Fourier transform spectrum(DRIFTS)

Sequence-Controlled Synthesis of Alternating Poly(ester amide)s using Water as Control Agent in One-Pot

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 Journal of Polymer Science 2024年第8期42卷 1015-1020页

作者： Tao Liu Fang-Fang Niu Kan Cheng yu-Min Xia bo-Mou Ma Xue-Li Wang Jian-Yong yu Yong He State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

Poly(ester amide)s(PEAs)attract much attention as a new kind of biodegradable ***,the synthesis of PEAs with sequence-regulated chain structures is still complicated due to the multistep polymerization,high monomer purity,as well as the usage of organic solvents,which greatly inhibits its development and ***,a one-pot strategy without solvent was developed to synthesize the alternating PEA fromα,ω-amino alcohol and dicarboxylic acid by sequential polycondensation,where water was used as the controlling agent for amidation and ***,the amidation and esterification were controlled to proceed in turn by adding or removing water,realizing the one-pot preparation of alternating *** resultant PEA is characterized by^1H-and^(13)C-NMR,and its chain structure is confirmed to be highly quasi-alternating similar to alternating PEAs prepared by classical methods The evaluations from DSC and DMA demonstrate that the properties of quasi-alternating PEA(T_(m)=102℃,ΔH_(m)=30J·g^(-1))are far superior to those of random PEA(T_(m)=72℃,ΔH_(m)<1 J·g^(-1)).

关键词： Biodegradable macromolecules Polymer architectures Sequence-controlled synthesis One-pot polymerization

SnS_(2) nanosheets decorated SnO_(2) hollow multishelled nanostructures for enhanced sensing of triethylamine gas

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第5期43卷 2339-2348页

作者： Wen-Di Liu ya Xiong Ao Shen Xin-Zhen Wang Xiao Chang Wen-bo Lu Jian Tian School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China College of Physics Qingdao UniversityQingdao 266071China Zernike Institute for Advanced Materials University of Groningen9747 AG GroningenThe Netherlands

Highly sensitive,fast and low-temperature detection of triethylamine(TEA)gas based on SnO_(2) is attractive yet remains ***,SnS_(2) nanosheets(NSs)/SnO_(2) hollow multishelled structures(HoMSs)-based sensors are designed by the synthesis of SnO_(2) HoMSs,followed by in situ sulfuration with *** varying the thioacetamide levels,Sn S_(2)/SnO_(2) heterostructures with different SnS_(2) contents were obtained and their TEA gas sensing performances were investigated.

关键词： SnS attractive sheets

Disaster effects of climate change in High Mountain Asia:State of art and scientific challenges Disaster effects of climate change in High Mountain Asia:State of art and scientific challenges

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3期15卷 367-389页

作者： Hao WANG Bin-Bin WANG Peng CUI yao-Ming MA yan WANG Jian-Sheng HAO yu WANG ya-Mei LI Li-Jun SUN Jiao WANG Guo-Tao ZHANG Wei-Mo LI yu LEI Wen-Qing ZHAO Jin-bo TANG Chao-yue LI Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China China‒Pakistan Joint Research Center on Earth Sciences Chinese Academy of SciencesIslamabad 45320Pakistan College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China College of Atmospheric Science Lanzhou UniversityLanzhou 730000China National Observation and Research Station for Qomolongma Special Atmospheric Processes and Environmental Changes Dingri 858200China

High Mountain Asia(HMA)shows a remarkable warming tendency and divergent trend of regional precipitation with enhanced meteorological *** rapid thawing of the HMA cryosphere may alter the magnitude and frequency of nature *** reviewed the influence of climate change on various types of nature hazards in HMA region,including their phenomena,mechanisms and *** reveals that:1)the occurrences of extreme rainfall,heavy snowfall,and drifting snow hazards are escalating;accelerated ice and snow melting have advanced the onset and increased the magnitude of snowmelt floods;2)due to elevating trigger factors,such as glacier debuttressing and the rapid shift of thermal and hydrological regime of bedrock/snow/ice interface or subsurface,the mass flow hazards including bedrock landslide,snow avalanche,ice-rock avalanches or glacier detachment,and debris flow will become more severe;3)increased active-layer detachment and retrogressive thaw slumps slope failures,thaw settlement and thermokarst lake will damage many important engineering structures and infrastructure in permafrost region;4)multi-hazards cascading hazard in HMA,such as the glacial lake outburst flood(GLOF)and avalanche-induced mass flow may greatly enlarge the destructive power of the primary hazard by amplifying its volume,mobility,and impact force;and 5)enhanced slope instability and sediment supply in the highland areas could impose remote catastrophic impacts upon lowland regions,and threat hydropower security and future water *** future,ongoing thawing of HMA will profoundly weaken the multiple-phase material of bedrock,ice,water,and soil,and enhance activities of nature *** and cascading hazards of high magnitude will prevail in *** the glacier runoff overpasses the peak water,low flow or droughts in lowland areas downstream of glacierized mountain regions will became more frequent and *** escalating hazards in the HMA region requires tackling s

关键词： High Mountain Asia Climate change Cryosphere degradation Nature hazards Disaster risk

Artificial cavernosa-like tissue based on multibubble Matrigel and a human corpus cavernous fibroblast scaffold

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2024年第3期26卷 260-267页

作者： yu-Zhuo Chen Yi-Hong Zhou Min-bo yan Ming Xiao Biao Liu Ying-Hao Yin Xiao-Li Tan Yong-Quan Huang yu-Hong Lin Ting Xie Jia-Li Tian Qi Wang Jian-Ying Li Zi-Zhou Meng Zheng Li Emily Xing yu-Xin Tang ya-Wei Li Zhong-Zhen Su Liang-yu Zhao Department of Ultrasound The Fifth Affiliated HospitalSun Yat-sen UniversityZhuhai 519000China Department of Interventional Medicine Guangdong Provincial Key Laboratory of Biomedical ImagingThe Fifth Affiliated HospitalSun Yat-sen UniversityZhuhai 519000China Department of Urology The Fifth Affiliated HospitalSun Yat-sen UniversityZhuhai 519000China Department of Andrology the Center for Men’s HealthUrologic Medical CenterShanghai Key Laboratory of ReproductiveMedicineShanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China Cedars-Sinai Medical Center Los AngelesCA 90024USA

Ex vivo tissue culture of the human corpus cavernosum(cc)can be used to explore the tissue structural changes and complex signaling *** present,artificial Cc-like tissues based on acellular or three-dimensional(3D)-printed scaffolds are used to solve the scarcity of primary penis tissue ***,inconvenience and high costs limit the wide application of such ***,we describe a simple,fast,and economical method of constructing artificial CC-like *** Cc fibroblasts(FBs),endothelial cells(ECs),and smooth muscle cells(SMCs)were expanded in vitro and mixed with Matrigel in specific proportions.A large number of bubbles were formed in the mixture by vortexing combined with pipette blowing,creating a porous,spongy,and spatial *** Cc FBs produced a variety of signaling factors,showed multidirectional differentiation potential,and grew in a 3D grid in Matrigel,which is necessary for CC-like tissue to maintain a porous structure as a cell *** the C-like tissue,ECs covered the surface of the lumen,and SMCs were located inside the trabeculae,similar to the structure of the primary *** cell components remained stable for 3 days in vitro,but the EC content decreased on the 7th ***/integrated(WNT)signaling activation led to lumen atrophy and increased tissue fibrosis in CC-like tissue,inducing the same changes in characteristics as in the primary *** study describes a preparation method for human artificial cC-like tissue that may provide an improved experimental platform for exploring the function and structure of the cC and conducting drug screening for erectile dysfunction therapy.

关键词： artificial tissue corpus cavernosum ex vivo fibroblasts

Recovering rare earths,lithium and fluorine from rare earth molten salt electrolytic slag using sub-molten salt method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第9期42卷 1774-1781,I0005页

作者： Delong yang Mingming yu yusufujiang Mubula Weiquan yuan Zheyu Huang bo Lin Guangjun Mei Tingsheng Qiu School of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou341000China Jiangxi Key Laboratory of Mining Engineering Jiangxi University of Science and TechnologyGanzhou341000China School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan430070China Gannan Institute of Science and Technology Ganzhou341000China

Viewing the problem of high ene rgy consumption in the process of recovering rare earths from rare earth molten salt electrolysis slag,an environmentally friendly and low carbon process by sub-molten salt decomposition was *** thermodynamic analysis of sub-molten salt reaction indicates that the recovery of rare earths from the slag using sub-molten salt medium is thermodynamically *** this process,the rare earth fluoride and lithium in the slag are almost transformed into rare earth hydroxide,sodium fluoride and lithium hydroxide,fluorine and lithium are transferred into the washing solution,and the rare earths in the residues can be leached into solution by acid *** the optimum reaction conditions of reaction temperature 200℃,reaction time 3 h,NaOH initial concentration 80%,NaOH-Slag mass ratio 3:1,the leaching efficiency of rare earths,fluorine and lithium can reach to 99.05%,98.23% and 99.22%.After evaporation,the fluorine and lithium in the washing solution can be obtained in the forms of sodium fluoride and lithium fluoride,the recovery efficiency reach 95.5%and 92.8%,*** RE oxides(99.53%) can be obtained from the leaching solution after precipitation and roasting.

关键词： Rare earth electrolysis slag Sub-molten salt Green extraction Fluorine Lithium Recovery

Robotic-assisted low anterior resection for rectal cancer shows similar clinical efficacy to laparoscopic surgery: A propensity score matched study

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第6期16卷 1558-1570页

作者： Shen-Xiang Long Xin-Ning Wang Shu-bo Tian yu-Fang Bi Shen-Shuo Gao yu Wang Xiao-bo Guo Department of Gastrointestinal Surgery Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250021Shandong ProvinceChina Department of Endocrinology Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250021Shandong ProvinceChina Department of Nursing The People’s Hospital of Zhangqiu AreaJinan 250200Shandong ProvinceChina Medical Center for Gastrointestinal Surgery Weifang People’s HospitalWeifang 261000Shandong ProvinceChina

BACKGROUND Rectal cancer ranks as the second leading cause of cancer-related mortality worldwide,necessitating surgical resection as the sole treatment *** the years,there has been a growing adoption of minimally invasive surgical techni-ques such as robotic and laparoscopic *** surgery represents an innovative modality that effectively addresses the limitations associated with traditional laparoscopic *** previous studies have reported favo-rable perioperative outcomes for robot-assisted radical resection in rectal cancer patients,further evidence regarding its oncological safety is still *** To conduct a comparative analysis of perioperative and oncological outcomes between robot-assisted and laparoscopic-assisted low anterior resection(LALAR)*** The clinical data of 125 patients who underwent robot-assisted low anterior resection(RALAR)and 279 patients who underwent LALAR resection at Shandong Provincial Hospital Affiliated to Shandong First Medical University from December 2019 to November 2022 were retrospectively *** performing a 1:1 propensity score matching,the patients were divided into two groups:The RALAR group and the LALAR group(111 cases in each group).Subsequently,a comparison was made between the short-term outcomes within 30 d after surgery and the 3-year survival outcomes of these two *** Compared to the LALAR group,the RALAR group exhibited a significantly earlier time to first flatus[2(2-2)d vs 3(3-3)d,P=0.000],as well as a shorter time to first fluid diet[4(3-4)d vs 5(4-6)d,P=0.001].Additionally,the RALAR group demonstrated reduced postoperative indwelling catheter time[2(1-3)d vs 4(3-5)d,P=0.000]and decreased length of hospital stay after surgery[5(5-7)d vs 7(6-8)d,P=0.009].Moreover,there was an observed increase in total cost of hospitalization for the RALAR group compared to the LALAR group[10777(10780-11850)dollars vs 10550(8766-11715)dollars,P=0.012].No signi

关键词： Rectal cancer Robotic surgical procedures Laparoscopy Low anterior resection Clinical efficacy

Effect of nano-graphite on mechanical properties and oxidation resistance of ZrB_(2)-SiC-graphite electrode ceramics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第6期31卷 1502-1513页

作者： bo-lin yang Chang-liu Kuang Zheng-long Liu Chao yu Cheng-ji Deng Jun Ding The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

ZrB_(2)-based ceramic composites were prepared by spark plasma sintering using ZrB_(2) powder prepared by molten salt method as raw material and SiC and nano-graphite as *** effects of nano-graphite addition on the physical properties and oxidation resistance of ZrB_(2)-based ceramic samples were *** results show that the addition of an appropriate amount of nano-graphite can effectively improve the density of ZrB_(2)-based ceramic composites and improve the physical properties of the *** flexural strength of the ceramic sample with 8 vol.%nano-graphite reached 418.54 MPa,which was 53.14% higher than that of ZrB_(2)-SiC ceramic material(273.31 MPa),and its oxidation resistance was also significantly *** demonstrats that the addition of an appropriate amount of nano-graphite can effectively improve the physical properties and oxidation resistance of ZrB_(2)-SiC ceramic *** prolonging its service life in application and promoting the development of ZrB_(2)-based ceramic composites,it is of great significance for clean steel smelting.

关键词： ZrB_(2)-SiC-graphite electrode ceramic ZrB_(2)-based ceramic composite Nano-graphite Physical property Oxidation resistance