检索结果-南通市图书馆

Effects of Substrate Pulse Bias Duty Cycle on the Microstructure and Mechanical Properties of Ti–Cu–N Films Deposited by Magnetic Field-Enhanced Arc Ion Plating

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2017年第2期30卷 176-184页

作者： Sheng-Sheng Zhao Yan-Hui Zhao Lv-Sha Cheng Vladimir Viktorovich Denisov nikolay Nikolaevich Koval Bao-Hai Yu Hai-Juan Mei School of Mechanical and Electrical Engineering Shenzhen Polytechnic Institute of Metal Research Chinese Academy of Sciences Institute of High Current Electronics Siberian BranchRussian Academy of Sciences

Ti–Cu–N films were deposited on 316 L stainless steel substrates by magnetic field-enhanced arc ion *** effect of substrate pulse bias duty cycle on the chemical composition,microstructure,surface morphology,mechanical and tribological properties of the films was systemically *** results showed that,with increasing the duty cycle,Cu content decreases from 3.3 to 0.58 at.%.XRD results showed that only Ti N phase is observed for all the deposited films and the preferred orientation transformed from Ti N（200） to Ti N（111） plane with the increase in duty *** surface roughness and deposition rate showed monotonous decrease with increasing the duty *** residual stress and hardness firstly increase and then decrease afterwards with the increase in duty cycle,while the variation of critical load shows reverse *** for the film with duty cycle of 10%,others perform the better wear resistance.

关键词： Magnetic field Arc ion plating Ti-Cu-N film Residual stress Hardness

维普期刊数据库

Deep neural networks for understanding noisy data applied to physical property extraction in scanning probe microscopy

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2019年第1期5卷 932-939页

作者： nikolay Borodinov Sabine Neumayer Sergei V.Kalinin Olga S.Ovchinnikova Rama K.Vasudevan Stephen Jesse Center for Nanophase Materials Science Oak Ridge National LaboratoryOak RidgeTN 37831USA

The rapid development of spectral-imaging methods in scanning probe,electron,and optical microscopy in the last decade have given rise for large multidimensional *** many cases,the reduction of hyperspectral data to the lower-dimension materialsspecific parameters is based on functional fitting,where an approximate form of the fitting function is known,but the parameters of the function need to be ***,functional fits of noisy data realized via iterative methods,such as least-square gradient descent,often yield spurious results and are very sensitive to initial ***,we demonstrate an approach for the reduction of the hyperspectral data using a deep neural network approach.A combined deep neural network/least-square approach is shown to improve the effective signal-to-noise ratio of band-excitation piezoresponse force microscopy by more than an order of magnitude,allowing characterization when very small driving signals are used or when a material’s response is weak.

关键词： neural networks property

Highly Sensitive Refractive Index Sensor Based on Plasmonic Bow Tie Configuration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonic Sensors 2020年第3期10卷 223-232页

作者： Muhammad Ali BUTT nikolay Lvovich KAZANSKIY Svetlana Nikolaevna KHONINA Department of Technical Cybernetic Samara National Research UniversitySamara 443086Russia Institute of RAS-Branch of the FSRC“Crystallography and Photonics” RAS151 MolodogvardeiskayaSamara 443001Russia

We propose a highly refractive index sensor based on plasmonic Bow Tie *** sensitivity of the resonator design is enhanced by incorporating a nanowall(NW)in a modified Bow Tie design where sharp tips of V-junction are *** approach provides high confinement of electric field distribution of surface plasmon polariton(SPP)mode in the narrow region of the ***,the effective refractive index(neff)of the mode increases and is highly responsive to the ambient *** sensitivity analysis of the SPP mode is calculated for six resonator *** results suggest that the NW embedded cavity offers the highest mode sensitivity due to the large shift of effective index when exposed to a slight change in the medium refractive ***,the device sensitivity of the proposed design is approximated at 2300 nm/RIU which is much higher than the sensitivity of the standard Bow Tie configuration.

关键词： Bow Tie configuration plasmonic sensor metal-insulator-metal waveguide refractive index sensor

Kinetics and mechanism of the low-energy β-a phase transition of the second kind in 2,4-dinitroanisole

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第10期40卷 210-224页

作者： Aleksandr V.Stankevich nikolay A.Rasputin Anisa KhRudina Gennady L.Rusinov Vera I.Filyakova Valery N.Charushin I.Ya. Postovsky Institute of Organic Synthesis Ural Branch of the Russian Academy of Sciencesekaterinburg 620108russia Russian Federal Nuclear Center-Zababakhin All-Russia Research Institute of Technical Physics snezhinsk 456770russia Kazan National Research Technological University kazan 420015russia

In this work, comprehensive studies of 2,4-dinitroanisole(2,4DNAN) were carried out using powder thermorentgenography of the internal standard. The time of the complete polymorphic transition in the solid phase β→a in 2,4DNAN under various combinations of conditions has been determined. It has been established that, regardless of the season of manufacture of the substance, when it is stored for 8-9months, with a change in ambient temperature from minus 30℃ to plus 30℃, a complete polymorphic transition β→a occurs. When stored in conditions below minus 5℃, polymorphic transition does not occur. When stored in conditions above plus 30℃ in a closed container, polymorphic transition occurs within 3 weeks. The polymorphic transition is accompanied by a decrease in density by 1.3%-1.5% and an increase in melting temperature by 10-12℃, depending on the degree of purity of the starting substance. The activation energy of the molecular rearrangement was 68-70 k J/mol(16.5 ± 3 kcal/mol). The mechanism of polymorphic transition has been evaluated, which is presumably based on internal homodiffusion and energy transfer to the surface of the mass of powder particles and the product. The average activation energy of the polymorphic transition process was 110 ± 6.2 k J/mol(26.2 kcal/mol). In an open container, reactions proceed by a homogeneous mechanism, and in a closed container by a heterogeneous mechanism involving the gas phase.

关键词： Energetic materials Melt-castable 2,4-Dinitroanisole Polymorphic transition Kinetics Mechanism Homodiffusion Sublimation

维普期刊数据库

A new genus and three new species of miniaturized microhylid frogs from Indochina(Amphibia: Anura:Microhylidae: Asterophryinae)

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2018年第3期39卷 130-157页

作者： nikolay A.Poyarkov Chatmongkon Suwannapoom Parinya Pawangkhanant Akrachai Aksornneam Tang Van Duong Dmitriy V.Korost Jing Che Department of Vertebrate Zoology Biological Faculty Lomonosov Moscow State University Joint Russian-Vietnamese Tropical Research and Technological Center 3. Division of Fishery School of Agriculture and Natural Resources University of Phayao 4. Department of Zoology Faculty of Science Kasetsart University Vietnam National Museum of Nature Vietnam Academy of Science and Technology Petroleum Geology Department Geological Faculty Lomonosov Moscow State University 7. State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Sciences Southeast Asia Biodiversity Research Institute Chinese Academy of Sciences

We report on the discovery of a new genus of microhylid subfamily Asterophryinae from northern and eastern Indochina, containing three new *** Gen. nov. are secretive miniaturized frogs(SVL<21 mm) with a mostly semi-fossorial lifestyle. To assess phylogenetic relationships, we studied 12 S rRNA – 16 S rRNA mt DNA fragments with a final alignment of 2 591 bp for 53 microhylid species. Morphological and osteological characters were analyzed using micro-CT scanning and used to describe the new genus. Results of phylogenetic analyses assigned the new genus into the mainly Australasian subfamily Asterophryinae as a sister taxon to the genus Siamophryne from southern Indochina. The three specimens collected from Gia Lai Province in central Vietnam, Cao Bang Province in northern Vietnam, and Chiang Rai Province in northern Thailand proved to be separate species, different both in morphology and genetics(genetic divergence 3.1%≤P≤5.1%). Our work provides further evidence for the "out of Indo-Eurasia"scenario for Asterophryinae, indicating that the initial cladogenesis and differentiation of this group of frogs occurred in the Indochina Peninsula. To date, each of the three new species of Vietnamophryne Gen. nov. is known only from a single specimen; thus,their distribution, life history, and conservation status require further study.

关键词： Vietnamophryne Gen. nov. Vietnamophryne inexpectata sp. nov. Vietnamophryne orlovi sp. nov. Vietnamophryne occidentalis sp. nov. Siamophryne Gastrophrynoides mtDNA micro-CT scanning Vietnam Thailand Herpetofauna Amphibia Biogeography Taxonomy Indochina

Erosion processes in karst landscapes of the Russian plain northern taiga,based on digital elevation modeling

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2016年第4期13卷 569-580页

作者： Elena POLYAKOVA Mikhail GOFAROV Yuriy KUTINOV Vladimir BELJAEV Zinaida CHISTOVA nikolay NEVEROV Vadim STARITSYN Alexandr MINEEV Sergey DURYNIN Institute of Ecological Problems of the North Ural Branch of Russian Academy of SciencesGeological Structure and Dynamics of the Lithosphere Laboratory Space Monitoring of the Arctic Centre of the Northern Arctic Federal University namedafter M.V.Lomonosov Arkhangelsk163000Russia Institute of Ecological Problems of the North Ural Branch of Russian Academy of SciencesMolecular Ecology and Biogeography LaboratoryArkhangelsk163000Russia Institute of Ecological Problems of the North Ural Branch of Russian Academy of SciencesGeological Structure and Dynamics of the Lithosphere LaboratoryArkhangelsk163000Russia

This paper considers the problems of the potential development of erosion processes in the natural landscapes of northern taiga in the Russian plain. It is considered that in forest ecosystems, erosion processes are slow and are weakly reflected in the terrain. However, the situation changes radically if the vegetation cover integrity is violated, which is inevitable with the modern methods of developing northern territories. Furthermore, global changes in average annual temperatures and the occurrence of karst processes may be the reason behind the development of erosion processes. The authors suggest a method for determining territories with a varying occurrence probability of erosional processes, based on digital elevation modelling. The territory of the Pinezhsky Nature Reserve(Arkhangelsk region) was chosen as the test plot. Direct field studies were previously used to detect exogenous geological processes in this territory. The authors were the first to suggest digital elevation modelling as a method that allows determining the potential danger of erosion in karst landscapes of the northern taiga. The geomorphometric studies resulted in the determination of areas with the greatest and lowest occurrence probability of erosion processes in the Pinezhsky Nature Reserve. It was established that the most significant erosion type was linear erosion, represented by incised river valleys and karst ravines. Sheet erosion is less significant and occurs as sinkholes, local declines, and chasms over the valleys of subterranean rivers.

关键词： Russian plain Erosion processes Karst Northern taiga Digital elevation model Geomorphometric parameters

维普期刊数据库

Discovery of Japalura chapaensis Bourret,1937(Reptilia:Squamata:Agamidae)from Southeast Yunnan Province,China

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2018年第2期39卷 105-113页

作者： Kai Wang Ke Jiang Yu-Fan Wang nikolay A.Poyarkov Jr. Jing Che Cameron D.Siler Sam Noble Oklahoma Museum of Natural History & Department of Biology University of Oklahoma Kunming Institute of Zoology Chinese Academy of Sciences Southeast Asia Biodiversity Research Institute Chinese Academy of Sciences Zhejiang Forest Resource Monitoring Center Department of Vertebrate Zoology Biological Faculty Lomonosov Moscow State University

Due to a paucity of surveys in northern Indochina and lack of international collaborations among neighboring countries, recognized distributional ranges for many amphibian and reptile species end at the political borders for some countries, despite seemingly continuous suitable habitat spanning the region. Combining both morphological and genetic data, we report the first discovery of Japalura chapaensis, a rare agamid lizard believed previously to be endemic to northern Vietnam only, along the border region of southeastern Yunnan Province,China. To facilitate future research on the genus Japalura sensu lato in Indochina, we provide detailed descriptions of additional specimens of this rare species, including the first description of coloration in life and an expanded diagnosis, and discuss the species boundary of J. chapaensis with respect to its congeners.

关键词： Draconinae Indochina Morphological Variation New record Range extension Systematics Taxonomy

Polarization-Insensitive Hybrid Plasmonic Waveguide Design for Evanescent Field Absorption Gas Sensor

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Photonic Sensors 2021年第3期11卷 279-290页

作者： nikolay Lvovich Kazanskiy Svetlana Nikolaevna Khonina Muhammad Ali Butt Department of Technical Cybernetics Samara National Research UniversityMoskovskoye Shosse 34Samara443086Russia Institute of RAS-Branch of the FSRC“Crystallography and Photonics”RAS Molodogvardeiskaya 151Samara443001Russia Institute of Microelectronics and Optoelectronics Warsaw University of TechnologyKoszykowa 75Warszawa00-662Poland

We propose a polarization-insensitive design of a hybrid plasmonic waveguide(HPWG)optimized at the 3.392µm wavelength which corresponds to the absorption line of methane *** waveguide design is capable of providing high mode sensitivity(Smode)and evanescent field ratio(EFR)for both transverse electric(TE)and transverse magnetic(TM)hybrid *** modal analysis of the waveguide is performed via 2-dimension(2D)and 3-dimension(3D)finite element methods(FEMs).At optimized waveguide parameters,Smode and EFR of 0.94 and 0.704,can be obtained for the TE hybrid mode,respectively,whereas the TM hybrid mode can offer Smode and EFR of 0.86 and 0.67,*** TE and TM hybrid modes power dissipation of~3 dB can be obtained for a 20-µm-long hybrid plasmonic waveguide at the 60%gas *** believe that the highly sensitive waveguide scheme proposed in this work overcomes the limitation of the polarization controlled light and can be utilized in gas sensing applications.

关键词： Hybrid plasmonic waveguide finite element method methane gas evanescent field absorption gas sensor polarization-insensitive

Atomic-Scale AES-EELS Analysis of Structure-Phase State and Growth Mechanism of Layered Nanostructures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Materials Physics and Chemistry 2016年第7期6卷 195-210页

作者： nikolay I. Plusnin Surface Physics Department of the Institute of Automation and Control Processes Vladivostok Russia

A review of our experience in range of electron spectroscopy of the physical vapor-phase deposition and growth of single- and multilayer nanostructures with atomic scale interfaces is presented. The foundation of an innovative methodology for the combined AES-EELS analysis of layered nanostructures is developed. The methodology includes: 1) determination of the composition, thickness, and the mechanism of phase transitions in nanocoatings under the probing depth most appropriated for the range of film thickness 1 - 10 ML;2) quantitative iteration Auger-analysis of the composition, thickness and growth mechanism of nanocoating;3) structural and phase analysis of nanocoatings with use of the analysis of position, shape and energy of the plasmon EELS peak and with subtracting the contribution from the substrate;4) analysis of phase transitions with use of the shift of the plasmon Auger-satellite and 5) non-destructive profiling of the composition of nanocoatings over depth with use of a dependence of the intensity and energy of EELS peaks on the value of the primary electron energy.

关键词： Surface Interface Nanocoating Layered Nanostructures PVD Growth AES-EELS Combined Analysis Iteration AES Analysis EELS Depth Profiling Element and Phase Composition Atom-Scale Resolution