检索结果-南通市图书馆

Frontier of the paleo-Tethys Ocean in the western mediterranean:Isotopic(Sm-Nd)constraints on sources of Devonian units from menorca Island

引用

Geoscience Frontiers 2024年第5期15卷 323-338页

作者： ricardo Arenas Jose m.Fuenlabrada Cristian Timoner rubén Díez fernández Esther rojo-pérez Departamento de mineralogía y petrología and Instituto de Geociencias(UCm CSIC)Universidad ComplutenseMadridSpain Unidad de Geocronología(CAI de Ciencias de la Tierra y Arqueometría) Universidad ComplutenseMadridSpain Bayerisches Geoinstitut University of BayreuthBayreuthGermany Instituto Geológico y minero de España–CSIC SalamancaSpain

The c.1000-m-thick pre-orogenic Devonian mainly metapelitic sequence of North menorca Island shows a fairly complete stratigraphic *** rocks of this sequence indicate gradually increasing deeper m.rine conditions of sedimentation towards its uppermost ***,the obtained sedimentary characteristics resemble those related to a deep and narrow basin-associated *** sills of Ti-augite-bearing alkaline gabbros occur within the Devonian *** intensity of Variscan deformation increases downwards through the *** to the characteristics of the Devonian sequence and its location within the Variscan Orogen,a correlation with similar units located in the southern sectors of the Central Iberian Zone(Iberian massif)is *** Devonian metapelitic rocks have geochemical characteristics suggesting that they represent moderately recycled mature siliciclastic sediments,generated from erosion of distant source areas belonging to an upper continental *** relatively narrow range of variation observed in initial^(143)Nd/^(144)Nd ratios supports a similar source for the menorcan slates(0.51165–0.51182).However,a m.rked trend is observed in these isotope ratios,from lower values at the base of the stratigraphic column(minimum value of 0.511941)to higher values at the top(maximum value of 0.512131).The^(147)Sm/^(144)Nd ratios vary between 0.1074 and 0.1238,within the range defined for siliciclastic rocks with felsic crustal *** Nd model ages define a narrow range between 1496 ma and 1754 ma(Late paleoproterozoic–Early mesoproterozoic),and they are consistently younger *** data rule out a.provenance from the erosion of the West Africa Craton,as they are m.re compatible with a.provenance from.regions located in the Trans-Saharan Belt or Sahara *** characteristics of the menorcan Devonian sequence are compatible with its deposition in a narrow and deep peri-Gondwanan transtensional basin,gener

关键词： Western paleo-Tethys frontiers menorca Island Sm-Nd isotopic constraints Devonian sequence provenance in Gondwana

来源：

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

BaTiO_(3)solid solutions co-doped with Gd^(3+)and Eu^(3+):Synthesis,structural evolution and dielectric properties

引用

Journal of rare Earths 2024年第10期42卷 1920-1926页

作者： r.m.rtínez-López m.pérez-Labra J.A.rom.ro-Serrano F.r.Barrientos-Hernández m.reyes-pérez m.I.Valenzuela-Carrillo G.Urbano-reyes V.E.reyes-Cruz G.I.Dávila.pulido Academic Area of Earth Sciences and materials Autonomous University of Hidalgo StateRoad Pachuca-Tulancingo Km 4.5 Mineral de La Reforma.Hidalgo42184Mexico metallurgy and materials Department ESIQIE-IPNUPALMZacatencoCiudad de Mexico07738Mexico Autonomous University of Coahuila Boulevard Adolfo López Mateos S/nNueva RositaCoahuila26800Mexico

In this paper,the synthesis,structural evolution,and dielectric properties of BaTiO_(3)solid solutions codoped with rare earth elements(Gd^(3+)and Eu^(3+))prepared using the solid-state reaction method are *** pure precursor powders of BaCl_3,TiO_(2),Gd_(2)O_(3),and Eu_(2)O_(3)were mixed in stoichiometric proportions,ground in an agate m.rtar before being uniaxially pressed at 250 mpa and sintered at 1300℃in air atmosphere for 6 h to obtain Ba_(1-3x)Gd_(2x)Ti_(1-3x)Eu_(4x)O_(3)(x=0,0.0015,0.01 and0.1).X-ray diffraction(XrD)and rietveld's refinement results reveal the crystal phase ferroelectric tetragonal BaTiO_(3)for the sa.ples with x=0,0.0015 and 0.01,as well as a consistent increment in the lattice parameters caused by the *** solubility limit of Gd^(3+)and Eu^(3+)in the BaTiO_(3)structure is reached for the sa.ple with x>0.01,and the orthorhombic Eu_2TiO_(5)and monoclinic BaTi_(2)O_(5)secondary phases were *** raman results show the characteristic peaks of ferroelectric tetragonal BaTiO_(3)around 716 cm^(-1)(LO of A1 symmetry),515 cm^(-1)(TO of A1 symmetry),and 305 cm^(-1)(B1).The maximum.relative permittivity measured at 1 kHz was recorded to be 6151.8 for the sa.ple with x=0.0015,and a decrease in the Curie temperature to 105℃with respect to the undoped sa.ple was *** punctual microanalysis for the sa.ples with x=0.0015,0.01,and 0.1 reveals grains composed of Ba,Ti,O,Gd,and Eu homogeneously distributed in the BaTiO_(3)*** Ba/Ti ratios for sa.ples with x=0.0015,0.01 and 0.1 are 2.86,2.91,and 0.68,respectively,indicating substitution at the Ti site for sa.ples with x=0.0015 and 0.01 and a substitution at the Ba site for the sa.ple with x=0.1.

关键词： BaTiO_(3) Doping Gadolinium Europium Synthesis rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

From prediction to prevention:machine learning revolutionizes hepatocellular carcinoma recurrence monitoring

引用

World Journal of Gastroenterology 2024年第7期30卷 631-635页

作者： m.riana michelle ram.rez-mejía Nahum méndez-Sánchez plan of Combined Studies in medicine Faculty of MedicineNational Autonomous University of MexicoDistrito Federal 04510Mexico Liver research Unit Medica Sur Clinic&FoundationDistrito Federal 14050Mexico Faculty of medicine National Autonomous University of MexicoDistrito Federal 04510Mexico

In this editorial,we comment on the article by Zhang et al entitled Development of a machine learning-based model for predicting the risk of early postoperative recurrence of hepatocellular *** carcinoma(HCC),which is characterized by high incidence and m.rtality rates,remains a major global health challenge prim.rily due to the critical issue of postoperative *** recurrence,defined as recurrence that occurs within 2 years posttreatment,is linked to the hidden spread of the prim.ry tum.r and significantly impacts patient *** predictive factors,including both patient-and treatment-related factors,have limited predictive ability with respect to HCC *** integration of machine learning algorithms is fueled by the exponential growth of computational power and has revolutionized HCC *** study by Zhang et al demonstrated the use of a groundbreaking preoperative prediction model for early postoperative HCC *** persist,including sa.ple size constraints,issues with handling data,and the need for further validation and *** study emphasizes the need for collaborative efforts,multicenter studies and comparative analyses to validate and refine the *** these challenges and exploring innovative a.proaches,such as multi-omics integration,will enhance personalized oncology *** study m.rks a significant stride toward precise,efficient,and personalized oncology practices,thus offering hope for im.roved patient outcomes in the field of HCC treatment.

关键词： Hepatocellular carcinoma Early recurrence machine learning XGBoost model predictive precision medicine Clinical utility personalized interventions

来源：

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

Brillouin expanded time-domain analysis based on dual optical frequency combs

引用

Light(Science & a.plications) 2024年第8期13卷 1534-1544页

作者： Jae Hyeong Youn Kwang Yong Song Sonia m.rtin-Lopez miguel Gonzalez-Herraez m.ría r.fernández-ruiz Dept.of physics Chung-Ang UniversitySeoulKorea Dept.of Electronics Universidad de AlcaláMadridSpain

Brillouin Optical Time-Domain Analysis(BOTDA)is a widely-used distributed optical fiber sensing technology employing pulse-modulated pump waves for local information retrieval of the Brillouin gain or loss *** spatial resolution of BOTDA systems is intrinsically linked to pulse duration,so high-resolution measurements demand high electronic bandwidths inversely proportional to the *** paper introduces Brillouin Expanded Time-Domain Analysis(BETDA)as a modified BOTDA system,simultaneously achieving high spatial resolution and low detection *** two optical frequency combs(OFCs)with different frequency intervals as pump and probe,local Brillouin gain spectra are recorded by their spectral beating traces in an expanded time domain.A 2-cm-long hotspot located in a 230m single-mode fiber is successfully measured in the time domain with a detection bandwidth of less than 100 kHz using dual OFCs with tailored spectral phase,line spacing,and bandwidth.

关键词： pump optical fiber

来源：

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

Liquid biopsy for gastric cancer:Techniques,a.plications,and future directions

引用

World Journal of Gastroenterology 2024年第12期30卷 1680-1705页

作者： Cristina Díaz del Arco m Jesús fernández Aceñero Luis Ortega medina Department of Surgical pathology Health Research Institute of the Hospital Clínico San CarlosHospital Clínico San CarlosMadrid 28040Spain Department of Legal medicine Psychiatry and PathologyUniversidad Complutense de MadridMadrid 28040Spain

After the study of circulating tum.r cells in blood through liquid biopsy(LB),this technique has evolved to encompass the analysis of multiple materials originating from the tum.r,such as nucleic acids,extracellular vesicles,tum.r-educated platelets,and other ***,research has extended to include the examination of sa.ples other than blood or plasma,such as saliva,gastric juice,urine,or *** techniques are diverse,intricate,and *** must be highly sensitive,and pre-analytical,patient,and tum.r-related factors significantly influence the detection threshold,diagnostic method selection,and potential ***,the implementation of LB in clinical practice still faces several *** potential a.plications of LB range from early cancer detection to guiding targeted therapy or immunotherapy in both early and advanced cancer cases,monitoring treatment response,early identification of relapses,or assessing patient *** the other hand,gastric cancer(GC)is a disease often diagnosed at advanced *** recent advances in molecular understanding,the currently available treatment options have not substantially im.roved the prognosis for many of these *** a.plication of LB in GC could be highly valuable as a non-invasive method for early diagnosis and for enhancing the management and outcomes of these *** this com.rehensive review,from a.pathologist’s perspective,we provide an overview of the main options available in LB,delve into the fundamental principles of the most studied techniques,explore the potential utility of LB a.plication in the context of GC,and address the obstacles that need to be overcome in the future to make this innovative technique a game-changer in cancer diagnosis and treatment within clinical practice.

关键词： Liquid biopsy Gastric cancer Circulating tum.r cells Cell-free DNA Circulating tum.r DNA molecular

来源：

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

BSN:The First Light Curve Analysis of the Total Eclipse Binary System EL Tuc

引用

research in Astronomy and Astrophysics 2024年第10期24卷 66-75页

作者： Elham Sarvari Eduardo fernández Lajús Atila.poro Independent researcher TehranIran Instituto de Astrofísica de La.plata(CCT La.plata-CONICET-UNLp) La PlataArgentina BSN project &Astronomy Department of the Raderon AI Lab.BurnabyBCCanada

We conducted the first light curve study of the binary star EL Tuc within the Binary Systems of South and North project's *** photometric observations were made using standard multiband BVr_cI_c filters at an observatory in *** presented a new ephem.ris for EL Tuc and a linear fit to the O–C diagram,utilizing our extracted times of minima and additional *** employed the pHysics Of Eclipsing BinariEs python code and the m.rkov chain monte Carlo a.proach for the system's light curve *** target system's light curve solution required a cold starspot on the hotter *** conclude that EL Tuc is a total contact binary system with a low mass ratio of q=0.172±0.002,an orbital inclination of i=83°.74±0°.40,and a fillout factor of f=53.7%±1.6%.We used the p-a relationship and the Gaia Data release 3 parallax method to determine the absolute parameters of EL Tuc to compare the precision of our *** system was classified as W-type based on the mass and effective temperature of the companion *** positions of the systems were depicted on the m-L,m.r,T-m,and *** relationship between the spectroscopic and photometric mass ratios of binaries was discussed.

关键词： (stars:)binaries:eclipsing stars:individual(EL Tuc) line:identification

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

HVSr analysis of pumice sands for sediment depth characterization:A case study for Guadalajara,mexico

引用

Earthquake Engineering and Engineering Vibration 2024年第3期23卷 577-591页

作者： Hafid Salgado m. Alejandro ram.rez-Gaytan Adolfo preciado Christian r.Escudero Departamento de Ciencias Exactas Centro Universitario de la CostaUniversidad de GuadalajaraCP.48280 Puerto VallartaJaliscoMéxico Departamento de Ciencias Computacionales Centro Universitario de Ciencias Exactas e IngenieríaUniversidad de GuadalajaraCP.44430 GuadalajaraJaliscoMéxico Departamento del Hábitat y Desarrollo Urbano Instituto Tecnológico y de Estudios Superiores de Occidente(ITESO)CP.45604 TlaquepaqueMéxico

The horizontal to vertical spectral ratio(HVSr)methodology is used here to characterize pumice soils and to image the three-dimensional surface geometry of Guadalajara,*** to other Latin Am.rican cities,Guadalajara is exposed to high seismic risk,with the particularity of being the largest urban settlement in Latin Am.rica built on pumice *** has not yet been tested to characterize subsoil depths in pumice *** to the questionable use of traditional geotechnical tests for the analysis of pumice soils,HVSr provides an alternative for its characterization without altering its fragile and porous *** this work,resonance frequency(F0)and peak a.plitude(A0)are used to constrain the depth of the major impedance contrast that represents the interface between bedrock and pumice *** were compared with borehole depths and other available geotechnical and geophysical data and show good *** of the profiles estimated on the riverbanks that cross the city,reveals different subsoil thickness that could have an impact on different site responses on riverine areas to an eventual *** and academic efforts are combined in this work to characterize depth sediments,an important parameter that impacts the regulations for construction in the city.

关键词： subsoil of Guadalajara shallow soil thickness bedrock depth pumice soil characterization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Does enhanced recovery after surgery programs im.rove clinical outcomes in liver cancer surgery?

引用

World Journal of Gastrointestinal Oncology 2024年第2期16卷 255-258页

作者： Belinda Sánchez-pérez Josém.ramia Department of General Digestive and Transplantation SurgeryUniversity Regional HospitalMálaga 29010MálagaSpain Department of Surgery Hospital General Universitario Dr.BalmisAlicante 03010Spain

Enhanced recovery after surgery(ErAS)programs have been widely a.plied in liver surgery since the publication of the first ErAS guidelines in 2016 and the new recommendations in *** surgery is usually performed in oncological patients(liver metastasis,hepatocellular carcinoma,cholangiocarcinoma,etc.),but the real impact of liver surgery ErAS programs in oncological outcomes is not clearly *** advantages of ErAS programs are:ErAS decreases postoperative complication rates and has been demonstrated a clear relationship between complications and oncological outcomes;a better and faster posto-perative recovery should let oncologic teams begin chemotherapeutic regimens on time;prehabilitation and nutrition actions before surgery should also im.rove the performance status of the patients receiving ***,ErAS could be another way to im.rove our oncological *** will discuss the literature about liver surgery ErAS focusing on its oncological implications and future investigations projects.

关键词： Enhanced recovery after surgery programs Liver surgery Key components Long-term oncological outcomes Enhanced recovery after surgery compliance

来源：

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

Exact solutions for magnetohydrodynamic nanofluids flow and heat transfer over a.permeable axisymmetric radially stretching/shrinking sheet

引用

Chinese physics B 2024年第2期33卷 108-114页

作者： U.S.mahabaleshwar G.p.Vanitha L.m.pérez Emad H.Aly I.pop Department of Studies in mathematics Davangere UniversityShivagangothriDavangereIndia Departamento de F´ısica FACIUniversidad de Tarapac´aCasilla 7DAricaChile Department of mathematics Faculty of EducationAin Shams UniversityRoxyCairoEgypt Department of mathematics Babes-Bolyai University400084 Cluj-NapocaRomania

We report on the magnetohydrodynamic impact on the axisymmetric flow of Al_(2)O_(3)/Cu nanoparticles suspended in H_(2)O past a stretched/shrinked *** the use of partial differential equations and the corresponding thermophysical characteristics of nanoparticles,the physical flow process is *** resultant nonlinear system of partial differential equations is converted into a system of ordinary differential equations using the suitable similarity *** transformed differential equations are solved *** of the magnetic parameter,solid volume fraction and stretching/shrinking parameter on momentum and temperature distribution have been analyzed and interpreted *** skin friction and Nusselt number were also *** addition,existence of dual solution was deduced for the shrinking sheet and unique solution for the stretching ***,Al_(2)O_(3)/H_(2)O nanofluid flow has better thermal conductivity on comparing with Cu/H_(2)O ***,it was found that the first solutions of the stream are stable and physically realizable,whereas those of the second ones are unstable.

关键词： magnetohydrodynamic nanofluid stretching/shrinking sheet axisymmetric flow analytical solution suction/injection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High-repetition-rate source of nanosecond duration kA-current pulses driven by relativistic laser pulses

引用

High power Laser Science and Engineering 2024年第3期12卷 106-115页

作者： michael Ehret Jakub Cikhardt philip Wykeham Bradford Iuliana-m.riana Vladisavlevici Tomas Burian Diego de Luis Jose Luis Henares rubén Hernández m.rtín Jon Imanol Apiñaniz roberto Lera JoséAntonio pérez-Hernández João Jorge Santos Giancarlo Gatti Centro de Láseres pulsados(CLpU) VillamayorSpain Czech Technical University in prague Faculty of Electrical EngineeringPragueCzech Republic Univ.Bordeaux-CNrS-CEA Centre Lasers Intenses et Applications(CELIA)UMR 5107TalenceFrance Department of radiation and Chemical physics FZU-Institute of Physics of the Czech Academy of SciencesPragueCzech Republic

We report the first high-repetition-rate generation and simultaneous characterization of nanosecond-scale return currents of kA-magnitude issued by the polarization of a target irradiated with a.pW-class high-repetition-rate titanium:sa.phire laser system at relativistic *** present experimental results obtained with the VEGA-3 laser at intensities from5×10^(18)to 1.3×10^(20)W cm^(-2).A non-invasive inductive return-current monitor is adopted to measure the derivative of return currents of the order of kA ns-1and analysis methodology is developed to derive return *** compare the current for copper,aluminium and Kapton targets at different laser *** data show the stable production of current peaks and clear prospects for the tailoring of the pulse shape,which is promising for future a.plications in highenergy-density science,for exa.ple,electromagnetic interference stress tests,high-voltage pulse response measurements and charged particle beam *** compare the target discharge of the order of hundreds of nC with theoretical predictions and a good agreement is found.

关键词： current pulses electromagnetic pulse a.plication high-power laser relativistic laser plasma

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：