Instruments and Experimental Techniques最新文献_第8页

Mitigating the Effect of Multipath on the Stability of Time Transfer Using GNSS 利用全球导航卫星系统减轻多径效应对时间传输稳定性的影响

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2024-10-23 DOI: 10.1134/S0020441224700635

Gihan G. Hamza

{"title":"Mitigating the Effect of Multipath on the Stability of Time Transfer Using GNSS","authors":"Gihan G. Hamza","doi":"10.1134/S0020441224700635","DOIUrl":"10.1134/S0020441224700635","url":null,"abstract":"Coordinated Universal Time (UTC) is calculated using the time data of hundreds of remote atomic clocks. These time data are generated by comparing the atomic clocks to another standard clock through time transfer. One-way time transfer using the Global Navigation Satellite Systems (GNSS) is one of the most essential and widely used time transfer techniques. The stability of the transferred time may be degraded due to many phenomena that affect GNSS signals during their path from the transmitter to the receiver. Multipath reflections are one of these phenomena that considerably degrade one way time transfer stability. It is a common notion that the fewer multipath reflections there are, the better the time transfer stability will be. This can be achieved by limiting the reception of GPS signals to high elevation satellites. In this paper, the author studied the effect of satellite elevation on time transfer stability for both GPS and Galileo. The results of this study suggest that the old shape of the relation between the elevation mask and the time transfer stability may have changed. Therefore, the author proposed a new technique for mitigating the effect of multipath on time transfer stability. The proposed technique was applied to real timing data generated from the Golden receiver of the Physikalisch-technische Bundesanstalt (PTB), which is the German national metrology institute.","PeriodicalId":587,"journal":{"name":"Instruments and Experimental Techniques","volume":"67 3","pages":"578 - 586"},"PeriodicalIF":0.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electronics Unit for “Sun–Terahertz” Scientific Equipment 用于 "太阳-太赫兹 "科学设备的电子装置

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2024-10-23 DOI: 10.1134/S0020441224700829

M. V. Philippov, V. S. Makhmutov, O. S. Maksumov, A. A. Kvashnin, A. N. Kvashnin, M. V. Razumeyko, V. I. Logachev, S. V. Mizin, S. V. Sokov

引用次数: 0

Time-of-Flight Spectroscopy of Hyperthermal Molecular Beams of Alkali and Alkaline Earth Metal Halides 碱金属和碱土金属卤化物超热分子束的飞行时间光谱学

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2024-10-23 DOI: 10.1134/S0020441224700660

V. M. Azriel’, V. M. Akimov, E. V. Ermolova, D. B. Kabanov, L. I. Kolesnikova, L. Yu. Rusin, M. B. Sevryuk

引用次数: 0

Optimization of the Transient Characteristics of the Rectifiers under High-Energy Electron Irradiation 优化整流器在高能电子辐照下的瞬态特性

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2024-10-23 DOI: 10.1134/S0020441224700866

I. V. Schemerov, P. B. Lagov, S. P. Kobeleva, V. D. Kirilov, A. S. Drenin, A. A. Mescheryakov

{"title":"Optimization of the Transient Characteristics of the Rectifiers under High-Energy Electron Irradiation","authors":"I. V. Schemerov, P. B. Lagov, S. P. Kobeleva, V. D. Kirilov, A. S. Drenin, A. A. Mescheryakov","doi":"10.1134/S0020441224700866","DOIUrl":"10.1134/S0020441224700866","url":null,"abstract":"It is shown that capacitance–frequency characterization can help to derive the optimization limits for radiation optimization of the transient properties of the rectifiers. Measurements of the current–voltage, capacitance–voltage, capacitance–frequency characteristics, and reverse recovery profiling were provided for silicon-based rectifiers. p–n-junction rectifiers were irradiated by 5 MeV electrons with fluences from 1014 to 1015 cm–2. It is shown that reverse-recovery time decreases after 5 MeV electron irradiation and this decreasing changes monotonously with irradiation dose (from 2.2 ms to 15 µs for 1015 cm–2). At the same time, series resistance increases dramatically (from 0.5 to 90 Ω); it indicates strong degradation of the high-frequency properties. Next criteria for optimal radiation dose can be used: the irradiation level associated with the maximum of boundary frequency indicates the optimum in terms of switching speed. Before this dose, maximum frequency is limited by reverse-recovery time of diode. After this dose, the limiting factor is the relaxation time of RC-circuit, where R is the series resistance of the diode and C is the capacitance of the SRC-region.","PeriodicalId":587,"journal":{"name":"Instruments and Experimental Techniques","volume":"67 3","pages":"587 - 592"},"PeriodicalIF":0.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facility for Registration of Deformation-Stimulated Luminescence of Crystals 晶体形变激发发光注册设备

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2024-10-23 DOI: 10.1134/S0020441224700854

K. Sh. Shunkeyev, D. M. Sergeyev, Sh. Zh. Sagimbayeva, Zh. K. Ubaev, A. E. German, A. Yu. Litskevich

引用次数: 0

A Hardware and Software Complex for Monitoring the Temperature of an MRI Magnet 用于监测核磁共振成像磁铁温度的硬件和软件综合系统

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2024-10-23 DOI: 10.1134/S0020441224700775

V. L. Odivanov, Ya. V. Fattakhov, A. R. Fakhrutdinov, V. A. Shagalov, A. A. Bayazitov

引用次数: 0

Analysis Synthesis and Implementation of Linear Energy Mixer by a Real-time Digital Signal Procesor 利用实时数字信号处理器分析、合成和实现线性能量混合器

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2024-10-23 DOI: 10.1134/S0020441224700623

Eli Flaxer

{"title":"Analysis Synthesis and Implementation of Linear Energy Mixer by a Real-time Digital Signal Procesor","authors":"Eli Flaxer","doi":"10.1134/S0020441224700623","DOIUrl":"10.1134/S0020441224700623","url":null,"abstract":"Multiple-Input Buck–Boost (MIBB) dc–dc converters receive energy from two or more energy sources that can Deliver Several Outputs of variable power. There are situations in which it is advantageous to use a buck-boost converter, i.e., when there is no guarantee that the input voltage will always be higher or always lower than the output voltage. This happens for example when there is an input voltage in an inverter that makes the interface between the photovoltaic panels or wind generators and the electrical grid. Here, we present a trigger-controlled MIBB converter topology with various input voltage sources and energy diversification of 0–100% of each source, determined by a pre-determined arbitrary value. The full-range linear transfer function of the controller drives the closed-loop MIBB system to operate as a linear single-input buck–boost converter. The response time of the controller is about 400 μs and therefore allows for high-speed real-time control. The intelligent fixed frequency switching strategy overcomes the limitations of present multiple-input converters by switching period sharing. System performance was verified by simulations and an experimental setup with two source inputs. It is shown that the system can be treated as a linear system, controlled by a single parameter—K. As a result, a simple to control MIBB system with a wide input/output range and fast response time is presented.","PeriodicalId":587,"journal":{"name":"Instruments and Experimental Techniques","volume":"67 3","pages":"484 - 493"},"PeriodicalIF":0.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-Current PMT with Improved Performance for Registration of Fast-Flowing Processes 性能更佳的大电流 PMT，用于快速流动过程的注册

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2024-10-23 DOI: 10.1134/S0020441224700726

A. S. Dolotov, M. N. Dolotova, R. A. Karakulov, P. I. Konovalov, R. I. Nurtdinov

引用次数: 0

Measurement of Time Resolution of Scintillation Detectors with EQR-15 Silicon Photodetectors for the Time-of-Flight Neutron Detector of the BM@N Experiment 用 EQR-15 硅光电探测器测量用于 BM@N 实验飞行时间中子探测器的闪烁探测器的时间分辨率

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2024-10-23 DOI: 10.1134/S0020441224700696

F. F. Guber, A. P. Ivashkin, N. M. Karpushkin, A. I. Makhnev, S. V. Morozov, D. V. Serebryakov, V. A. Baskov, V. V. Polyanskiy

{"title":"Measurement of Time Resolution of Scintillation Detectors with EQR-15 Silicon Photodetectors for the Time-of-Flight Neutron Detector of the BM@N Experiment","authors":"F. F. Guber, A. P. Ivashkin, N. M. Karpushkin, A. I. Makhnev, S. V. Morozov, D. V. Serebryakov, V. A. Baskov, V. V. Polyanskiy","doi":"10.1134/S0020441224700696","DOIUrl":"10.1134/S0020441224700696","url":null,"abstract":"To study the dependence of the equation of state of high-density nuclear matter on the term characterizing the isospin (proton–neutron) asymmetry of nuclear matter, it is necessary to measure azimuthal flow of neutrons as well as azimuthal flow of charged particles from a dense nuclear matter in the nuclear–nuclear collisions. For this purpose, the Institute for Nuclear Research (Russian Academy of Sciences) is developing a new high-granular neutron detector that will be used in the BM@N experiment at the extracted beam of the Nuclotron accelerator at the Joint Institute for Nuclear Research (JINR, Dubna). This detector will identify neutrons and measure their energies in the heavy-ion collisions up to 4 GeV per nucleon. This article presents the results of measurements of the time resolution and light yields of samples of scintillation detectors with sizes 40 × 40 × 25 mm3 that will be used in a neutron detector based on the currently available fast plastic scintillator manufactured by JINR using an EQR15 11-6060D-S photodetector for light readout. For comparison, the results of measurements for a detector of the same size with a EJ-230 fast scintillator and with the same type of photodetector are given. The measurements were made on cosmic muons as well as on the Pakhra electron synchrotron of the Lebedev Physical Institute of the Russian Academy of Sciences located in Troitsk, Moscow.","PeriodicalId":587,"journal":{"name":"Instruments and Experimental Techniques","volume":"67 3","pages":"443 - 446"},"PeriodicalIF":0.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband Receiver for MRI 核磁共振成像宽带接收器

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2024-10-23 DOI: 10.1134/S0020441224700842

V. A. Shagalov, A. R. Fakhrutdinov, Ya. V. Fattakhov, V. L. Odivanov

引用次数: 0