检索结果-南通市图书馆

Slope stability evaluation and monitoring of a landslide: a case study from NE Turkey

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2020年第11期17卷 2624-2635页

作者： Ayberk kaya Umit murat MIDILLI Recep Tayyip Erdogan University Faculty of Engineering and ArchitectureDepartment of Civil EngineeringRize 53100Turkey Recep Tayyip Erdogan University Faculty of Engineering and ArchitectureDepartment of Geological EngineeringRize 53100Turkey

Landslides are quite common natural hazards in the eastern Black Sea region of NE *** the heavy rainfall in the K?prülü(Rize)village settlement area,located in this region where the slope debris overlies the agglomerates,a failure *** to the developed tension cracks and deformations on the ground,houses,tea gardens,and roads were damaged *** figure out the causes and mechanism of the sliding and to suggest the precautions,a detailed geotechnical study was carried *** the five survey lines,twelve boreholes were drilled with a total depth of 300 ***,the geophysical surveys on ten profiles were conducted and the inclinometer measurements were taken in five *** and disturbed samples were collected and laboratory experiments were *** measurements indicated that the sliding started in the slope debris and then spread to the agglomeratic *** slope stability was examined using the limit equilibrium(LE)and finite element(FEM)analysis *** results of the slope stability analyses showed that the failure mode is talus slide with composite shape and outputs coincide with the inclinometer monitoring *** on the collected data,it is determined that there will be unavoidable engineering problems if no precautions are *** of the negative reasons which make the application of supporting methods meaningless in the study area,it is considered that transferring the residences to a safer place without risk of natural hazards will be economical and reliable.

关键词： Landslide Stability Analysis Monitoring Precaution Koprulu Village

A taxonomic study on the families Lepadellidae and Trichocercidae （Rotifera： Monogononta） of Turkey

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2007年第4期25卷 423-426页

作者： kaya murat ALTINDAG Ahmet Department of Biology Faculty of Science Ankara University 06100 Besevler Ankara-Turkey

Thirteen rotifer species belonging to the families Lepadellidae and Trichocercidae were studied taxonomically from nine water bodies in Turkey. Lepadella biloba is a new entry to the Turkish rotifer fauna. All species... 详细信息

关键词： Rotifer taxonomy Lepadellidae Colurella Trichocercidae Turkey

Nonlinear restructuring of patterned thin films by residual stress engineering into out-of-plane wavy-shaped electrostatic microactuators for high-performance radio-frequency switches

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2023年第3期9卷 397-409页

作者： Rayan Bajwa Heba Saleh Milad Shojaeian Ibrahim Tekin murat kaya Yapici Faculty of Engineering and Natural Sciences Sabanci University34956 IstanbulTurkey Sabanci University SUNUM Nanotechnology Research Center 34956 IstanbulTurkey Department of Electrical Engineering University of Washington98195 SeattleWAUSA

Electrostatic microelectromechanical (MEMS) switches are the basic building blocks for various radio-frequency (RF) transceivers. However, conventional cantilever-based designs of MEMS switches require a large actuation voltage, exhibit limited RF performance, and suffer from many performance tradeoffs due to their flat geometries restricted in two dimensions (2D). Here, by leveraging the residual stress in thin films, we report a novel development of three-dimensional (3D) wavy microstructures, which offer the potential to serve as high-performance RF switches. Relying on standard IC-compatible metallic materials, we devise a simple fabrication process to repeatedly manufacture out-of-plane wavy beams with controllable bending profiles and yields reaching 100%. We then demonstrate the utility of such metallic wavy beams as RF switches achieving both extremely low actuation voltage and improved RF performance owing to their unique geometry, which is tunable in three dimensions and exceeds the capabilities of current state-of-the-art flat-cantilever switches with 2D-restricted topology. As such, the wavy cantilever switch presented in this work actuates at voltages as low as 24 V while simultaneously exhibiting RF isolation and insertion loss of 20 dB and 0.75 dB, respectively, for frequencies up to 40 GHz. Wavy switch designs with 3D geometries break through the design limits set by traditional flat cantilevers and provide an additional degree of freedom or control knob in the switch design process, which could enable further optimization of switching networks used in current 5G and upcoming 6G communication scenarios.

关键词： performance cantilever dimensions

Constraints on unconsolidated pyroclastic flow sediments related REE enrichments originated from potassic-alkaline Gölcük stratovolcano: Darıdere-Direkli-Yakaören (DDY) table 4deposits, southwestern Anatolia of Turkey

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

Acta Geochimica 2021年第6期40卷 926-944页

作者： murat Budakoglu Ali Tugcan Unluer Zeynep Doner Huseyin Kocaturk Mustafa kaya Mustafa Kumral M.Sezai Kirikoglu Department of Geological Engineering Faculty of MinesIstanbul Technical UniversityIstanbulTurkey

In the last five decades,Rare Earth Elements(REE)are mostly produced from carbonatite complexes and alkaline magmatic *** this respect,pyroclastic flows produced by the potassic-alkaline Gölcük volcanism in the Isparta(SW,Turkey)angle stand out as an important target area where REE enrichments can be *** study focuses on the REE potential,geochemical and mineralogical characteristics of REE-bearing minerals as well as formation modeling of unconsolidated pyroclastic flows in Darıdere-Direkli-Yakaören(DDY)deposits in ***-bearing minerals of DDY deposits which contain abundant trachytic-trachyandesitic rock fragments were determined as fluorapatite,britholite,and chevkinite by using XRD and SEM–EDX *** to the geochemical analysis,the vast majority of RREE(up to 996 ppm)content is LREE such as La,Ce and ***ıdere is the most REE enriched region followed by Yakaören and Direkli regions in terms of LREE(574.9 ppm),relative to MREE(38.5 ppm)and HREE(5.28 ppm)*** results are also on par with subduction-related Italian extrusive carbonatites such as Polino,Cupaello and San *** DDY deposits can also be comparable with intraplate extrusive REE deposits in terms of LREE enrichments,however,HREE,Nb,Th and Zr values are generally *** RREE concentrations tend to rise with the increasing contents of alkaline elements(Na and K),HFSE(such as Nb and U),as well as LILE(Ba,Sr and Rb)and are negatively affected by sedimentary carbonate *** economic value of the DDY deposits can gain importance due to the increasing global demand for LREE’s.

关键词： Pyroclastic flows Rare Earth Elements(REE) Apatite Britholite Chevkinite Alkaline-Ultrapotasic magmatism

Electrical and dielectric properties of Al/p-Si and Al/perylene/p-Si type diodes in a wide frequency range

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第1期23卷 519-524页

作者： Ahmet kaya akaya@turgutozal.edu.tr Physics Department Faculty of Sciences Gazi University Ankara 06500 Turkey

The perylene （C20H12） layer effect on the electrical and dielectric properties of Al/p-Si （MS） and Al/perylene/p-Si （MPS） diodes have been investigated and compared in the frequency range of 0.7 kHz-2 MHz. Experimental results show that C-V characteristics give an anomalous peak for two structures at low frequencies due to interface states （Nss） and series resistance （Rs）. The increases in C and G/o3 at low frequencies confirm that the charges at interface can easily follow an ac signal and yield excess capacitance and conductance. The frequency-dependent dielectric constant （er） and dielectric loss （e＇） are subtracted using C and G/co data at 1.5 V. The eI and e＂ values are found to be strongly dependent on frequency and voltage, and their large values at low frequencies can be attributed to the excess polarization coming from charges at traps. Plots of ln（o＇ac）-ln（w） for two structures have two linear regions, with slopes of 0.369 and 1.166 for MS, and of 0.077 and 1.061 for MPS, respectively. From the C 2-V characteristics, the doping acceptor atom concentration （NA） and barrier height （,~） for Schottky barrier diodes （SBDs） 1.303 ~ 1015 cm-3, and 1.10 and I. 13 eV, respectively. of MS and MPS types are also obtained to be 1.484 ~ 1015

关键词： organic-inorganic based Schottky diodes perylene (C20H12) interfacial layer electrical and di-electric properties frequency and voltage dependence

Human Gait Recognition Based on Kernel PCA Using Projections

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2007年第6期22卷 867-876页

作者： murat Ekinci murat Aykut Computer Vision Lab Department of Computer EngineeringKaradeniz Technical University61080 TrabzonTurkey

This paper presents a novel approach for human identification at a distance using gait recognition. Recognition of a person from their gait is a biometric of increasing interest. The proposed work introduces a nonlinear machine learning method, kernel Principal Component Analysis （PCA）, to extract gait features from silhouettes for individual recognition. Binarized silhouette of a motion object is first represented by four 1-D signals which are the basic image features called the distance vectors. Fourier transform is performed to achieve translation invariant for the gait patterns accumulated from silhouette sequences which are extracted from different circumstances. Kernel PCA is then used to extract higher order relations among the gait patterns for future recognition. A fusion strategy is finally executed to produce a final decision. The experiments are carried out on the CMU and the USF gait databases and presented based on the different training gait cycles.

关键词： biometrics gait recognition gait representation kernel PCA pattern recognition

Palmprint Recognition by Applying Wavelet-Based Kernel PCA

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2008年第5期23卷 851-861页

作者： murat Ekinci murat Aykut Computer Vision Lab Department of Computer Engineering Karadeniz Technical University

This paper presents a wavelet-based kernel Principal Component Analysis （PCA） method by integrating the Daubechies wavelet representation of palm images and the kernel PCA method for palmprint recognition. Kernel PCA is a technique for nonlinear dimension reduction of data with an underlying nonlinear spatial structure. The intensity values of the palmprint image are first normalized by using mean and standard deviation. The palmprint is then transformed into the wavelet domain to decompose palm images and the lowest resolution subband coefficients are chosen for palm representation. The kernel PCA method is then applied to extract non-linear features from the subband coefficients. Finally, similarity measurement is accomplished by using weighted Euclidean linear distance-based nearest neighbor classifier. Experimental results on PolyU Palmprint Databases demonstrate that the proposed approach achieves highly competitive performance with respect to the published palmprint recognition approaches.

关键词： palmprint recognition kernel PCA wavelet transform biometrics pattern recognition

Paleoseismological trenching and seismic hazard assessment of the Bozkurt Segment of the Maymundağı Fault, Acıgöl Graben, SW Türkiye

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第11期21卷 3789-3813页

作者： Ali kaya Pamukkale University Faculty of EngineeringDepartment of Geological EngineeringDenizli 20160Türkiye

The Acıgöl Graben in SW Turkey,ca.50-55 km in length and 11-15 km in width,formed during the Miocene to Quaternary *** graben is bounded by active normal faults of MaymundağıFault(MF)to the northwest and the GemişFault Zone(GFZ)to the southeast that have triggered significant earthquakes,causing considerable *** study focuses on the Bozkurt segment of the MF,which caused a damaging earthquake(Mw 6.0)in 2019 and another significant earthquake in 1886 during historical times.A paleoseismological trench survey along the Bozkurt segment revealed at least two faulting events,with the last event producing a vertical displacement of 0.25 *** Optical Stimulated Luminescence(OSL)dating indicates that the last earthquake occurred 3.13±0.33 ka BP,while the penultimate earthquake occurred 4.0±0.72 ka *** dates correspond to a long-term slip rate of approximately 0.36±0.11 mm/a and a mean recurrence interval of 2.08 ka,short-term slip rate 0.78±0.16 mm/a and recurrence interval of 0.96 ka,and compatible with the mean sedimentation rate of 0.26 mm/a,calculated from drill logs in Acıgöl *** the 6 km length of the Bozkurt segment and its vertical displacement of 0.25 m in the last event,this segment has the potential to generate earthquakes ranging from 5.6 to 5.9 ***-term slip rates derived from geomorphological data are 0.56 mm/year to the north and 0.64 mm/a to the south of the graben,indicating higher subsidence on the southern *** rates are in accordance with the slip rates calculated from the paleoseismological trench survey and sedimentation rate from the *** indications show that the Bozkurt segment is an active Holocene fault with relatively long recurrence intervals and low-slip ***,the paleoseismological studies in combination with geomorphological data are important tool to assess seismic hazards and to define the characteristics of individual fault segments.

关键词： Paleoseismology Fault slip-rates Subsidence Bozkurt earthquake OSL dating Acıgöl Graben

Aldol Condensation and Michael Addition of 4,4-Dimethyl- cyclohexane-l,3-dione and Aromatic Aldehydes, Unconventional Substituent Effects

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2011年第11期29卷 2355-2360页

作者： kaya, Muharrem Chemistry Department Faculty of Arts and Science Dumlupmar University 43100 Kutahya Turkey

By the cyclization of 4,4-dimethylcyclohexane-1,3-dione with different aromatic aldehydes, the xanthene regio- isomers were obtained. The diversity of xanthene isomers could be determined. The electronic and steric ef... 详细信息

关键词： aldol reaction Michael addition xanthene regioselectivity substituent effects X-ray diffraction