Instruments and Experimental Techniques最新文献

Automated Installation of Impulse Heating of a Wire Probe for Determining Critical Properties of Thermally Unstable Substances 用于测定热不稳定物质临界特性的脉冲加热线探针的自动安装

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700654

A. N. Kotov, N. S. Bogatishcheva, G. V. Panov

引用次数: 0

Optimal Method for Studying Cosmic Rays at Ultrahigh Energies 研究超高能量宇宙射线的最佳方法

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S002044122570071X

S. B. Shaulov

引用次数: 0

A Generator of High-Power Pulses with Nanosecond Front Edge Based on Blocks of Shock-Ionized Dynistors 基于冲击电离能块的纳秒级高能脉冲发生器

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700642

S. V. Korotkov, A. L. Zhmodikov, K. A. Kozlov, D. A. Korotkov

{"title":"A Generator of High-Power Pulses with Nanosecond Front Edge Based on Blocks of Shock-Ionized Dynistors","authors":"S. V. Korotkov, A. L. Zhmodikov, K. A. Kozlov, D. A. Korotkov","doi":"10.1134/S0020441225700642","DOIUrl":"10.1134/S0020441225700642","url":null,"abstract":"The possibility of efficiently using the principle of pulse voltage multiplication in generators of powerful nanosecond pulses based on high-voltage blocks of shock-ionized dynistors is demonstrated. The electric circuit and design of a generator containing a coaxial cable with a characteristic impedance of 75 Ω and four modules with an operating voltage of 10 kV are described. The modules are switched on in a relay-race mode; each module includes a block of dynistors and a capacitor bank with a capacitance of 8.8 nF. The results of an experimental study of the generator are given. When the cable is connected to a 75-Ω resistor and the capacitors are charged to a voltage of 10 kV, the generator provides the formation of output voltage pulses with an amplitude of ~38 kV, a front-edge duration of ~4.5 ns, and a half-height duration of ~145 ns. The jitter of the output pulses does not exceed 2 ns. When connecting the cable to a spark gap, the generator is capable of operating in a wide range of spark-gap breakdown voltages, as well as in the idling mode, in which the voltage amplitude at the end of the cable reaches a value close to 80 kV. The possibility of scaling up the generator output parameters is shown.","PeriodicalId":587,"journal":{"name":"Instruments and Experimental Techniques","volume":"68 3","pages":"394 - 399"},"PeriodicalIF":0.4,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0020441225700642.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145128666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stress Characteristics and Pressure Bearing Capacity of the Split Type Ultra-high-Pressure Die 分体式超高压模具的应力特性及承压能力

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700514

Liang Zhao, Liang Wang, Wenji Chen, Nannan Wu, Xiaobo Liang

{"title":"Stress Characteristics and Pressure Bearing Capacity of the Split Type Ultra-high-Pressure Die","authors":"Liang Zhao, Liang Wang, Wenji Chen, Nannan Wu, Xiaobo Liang","doi":"10.1134/S0020441225700514","DOIUrl":"10.1134/S0020441225700514","url":null,"abstract":"The split-type ultra-high-pressure die with a prism-type cavity is studied by numerical simulation and destructive experiments, which is used for synthesizing super-hard materials and scientific research. The relationship between the split angle and cylinder stresses, stress characteristics, and ultimate pressure-bearing capacity is analyzed. In split-type dies, the divided bodies are pressed together, providing significantly improved massive and lateral support effects, which effectively minimize cylinder stress. The simulation results demonstrate that an increase in the split angle of the cylinder leads to a corresponding decrease in cylinder stress. The stresses in the radial split-type cylinder with a prism-shaped cavity are significantly lower compared to those in belt-type and tangential split-type cylinders. The inner wall of the split-type cylinder, which is flat, bears compressive stresses in the circumferential, radial, and axial directions, resulting in a stress condition that closely resembles the hydrostatic stress state, which is an optimal condition for tungsten carbide material. The pressure-bearing capacities have been verified through destructive experiments and the results indicate that the split-type dies are capable of bearing higher pressures. The split-type ultra-high-pressure die introduces a novel idea and approach to achieving a higher ultimate pressure-bearing capacity and a larger cavity.","PeriodicalId":587,"journal":{"name":"Instruments and Experimental Techniques","volume":"68 3","pages":"427 - 436"},"PeriodicalIF":0.4,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145128671","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

Laser Methane Emission Monitoring Based on Harmonic Ratio Feature and Estimation of Absorption Pulse Parameters 基于谐波比特征和吸收脉冲参数估计的激光甲烷发射监测

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700526

N. V. Bach, I. A. Baryskievic, A. A. Baryskievic, V. Tsviatkou

引用次数: 0

A Setup for Studying Interactions of Fast Neutrons and Light Nuclei with an Electron−Positron Pair Spectrometer 用电子-正电子对谱仪研究快中子与轻核相互作用的装置

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700630

S. Kh. Karaevsky, S. I. Potashev, Yu. M. Burmistrov, A. A. Kasparov, E. A. Permyakov, V. N. Ponomarev, V. I. Razin

引用次数: 0

Optical Diagnostics of Low-Absorbing Drops in Nonstationary Aerosol Flows 非平稳气溶胶流中低吸收滴的光学诊断

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700587

A. E. Varfolomeev, V. V. Pimenov, A. A. Sabel’nikov, E. V. Chernenko, A. O. Aleksandrov, N. P. Zaretskii

引用次数: 0

Experimental Investigations for Substantiating the Development of a 103Ru/103mRh Generator 103Ru/103mRh发电机研制的实验研究

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700617

V. A. Zagryadskii, K. O. Korolev, Ya. M. Kravets, A. V. Kurochkin, A. N. Strepetov, T. A. Udalova

引用次数: 0

A Double Channel Frequency Counter Based on Kalman Filtering and Neural Network Compensation 基于卡尔曼滤波和神经网络补偿的双通道频率计数器

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S002044122570054X

Yibo Fan, Shishen Li, Lanqian Lu, Jianhao Huang, Jun Li, Bo Liu

引用次数: 0

Minimization of Problems while Creating Two-Phase Flowmeters for Cryogenics and Their Features: Part II. Diagnostics of Hydrogen and LNG Flows 最大限度地减少问题，同时创建两相流量计的低温和他们的特点：第二部分。氢和液化天然气流动的诊断

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700708

Yu. P. Filippov, A. M. Kovrizhnykh, A. Yu. Filippov

{"title":"Minimization of Problems while Creating Two-Phase Flowmeters for Cryogenics and Their Features: Part II. Diagnostics of Hydrogen and LNG Flows","authors":"Yu. P. Filippov, A. M. Kovrizhnykh, A. Yu. Filippov","doi":"10.1134/S0020441225700708","DOIUrl":"10.1134/S0020441225700708","url":null,"abstract":"The ways to create two-phase hydrogen flowmeters in the range of mass or volume flow rates from approximately 0.2 to 2.5 kg/s or from ~10 to ~130 m3/h, counting by liquid, and flowmeters for liquefied natural gas (LNG) from ~5 to ~210 kg/s or from ~50 to ~2100 m3/h are offered. The principle of operation of flowmeters is based on a combination of void-fraction RF-sensors with a uniform electric field inside sensitive elements with different sensitivities to determine the average density of a two-phase mixture and conical narrowing devices to find the average flow velocity. The expediency of using gamma densitometers for two-phase LNG flowmeters at relatively large diameters DN ≥ 250 is shown. It is proposed how to minimize the problems inherent in such two-phase flowmeters taking the experience of creating analogues for helium into account. The differences between the approaches for the implementation of systems for hydrogen and LNG compared to analogues for two-phase helium due to the significant difference in their properties are considered. Specific technical solutions of two-phase hydrogen and LNG flowmeters with horizontal flow-through cryostats are presented, which are operable in the range of void fractions from 0 to ~0.9 with a relatively small total hydraulic resistance of the flowmeter path. The features of RF-sensor calibrations at different temperatures of cryogens are noted. Some disadvantages of previous approaches to determining the LNG flowrates are shown and the uncertainties of finding the flowrates of two-phase hydrogen and LNG flows are estimated.","PeriodicalId":587,"journal":{"name":"Instruments and Experimental Techniques","volume":"68 3","pages":"511 - 525"},"PeriodicalIF":0.4,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145128669","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