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Effects of Boron Diffusion on Titanium Silicide Formation 硼扩散对硅化钛形成的影响
Q3 Physics and Astronomy Pub Date : 2023-01-01 DOI: 10.21272/jnep.15(1).01019
H. Karboua, N. Dahraoui, M. Boulakroune, T. Fortaki
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引用次数: 0
Laser-Induced Modification of the Morphology and Defect Structure of Heterostructures Based on Detector-Grade CdTe Crystals 基于探测器级CdTe晶体的异质结构形貌和缺陷结构的激光诱导改性
Q3 Physics and Astronomy Pub Date : 2023-01-01 DOI: 10.21272/jnep.15(1).01001
V. Gnatyuk, O. Maslyanchuk, V. Strebezhev, I. Fodchuk, M. Solovan, M. Sorokatyi, I. Boledzyuk, A. Kuzmin
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引用次数: 1
Model of Corncob Biochar Modified Carbon Paste Electrode for Nitrite Detection 玉米芯生物炭修饰碳糊电极亚硝酸盐检测模型
Q3 Physics and Astronomy Pub Date : 2023-01-01 DOI: 10.21272/jnep.15(3).03005
B. N. Sulastri, K. A. Madurani, F. Kurniawan
The ability of corncob biochar as a modifier of carbon paste electrodes for nitrite sensing was investigated and compared to unmodified carbon paste electrodes. Nitrite standard solutions in 0.1 M phosphate buffer solution (pH 7.0) were measured using cyclic voltammetry with a potential range of 0.1 to 1 V and a scan rate of 100 mV s – 1 . The corncob biochar-modified carbon paste electrode provided better performance than the unmodified electrode, with an anodic peak of 20 mg L – 1 nitrite appearing at a potential of 0.84 V, indicating nitrite oxidation. In contrast, the unmodified carbon paste electrode did not show any significant peak. To confirm that the observed peak is indeed the anodic peak of nitrite, we conducted measurements at different nitrite concentrations of 0, 20, and 50 mg L – 1 . In the absence of nitrite, no significant peak was observed. However, in nitrite solutions, the anodic peak increased with higher concentrations of nitrite. Additionally, the corncob biochar-modified carbon paste electrode demonstrated good selectivity for nitrite detection, as cyclic voltammetric measurements of some interference components did not produce redox peaks in the potential range of nitrite oxidation. These findings suggest that corncob biochar has significant potential for the development of electrochemical nitrite sensors.
研究了玉米芯生物炭作为碳糊电极亚硝酸盐传感改性剂的性能,并与未改性的碳糊电极进行了比较。采用循环伏安法,在0.1 M磷酸盐缓冲溶液(pH 7.0)中测定亚硝酸盐标准溶液,电位范围为0.1 ~ 1 V,扫描速率为100 mV s - 1。玉米芯生物炭修饰的碳糊电极性能优于未修饰的电极,在0.84 V电位下出现20 mg L - 1亚硝酸盐的阳极峰,表明亚硝酸盐氧化。相比之下,未经修饰的碳糊电极没有出现明显的峰值。为了证实观察到的峰确实是亚硝酸盐的阳极峰,我们在不同的亚硝酸盐浓度(0、20和50 mg L - 1)下进行了测量。在没有亚硝酸盐的情况下,没有观察到明显的峰。然而,在亚硝酸盐溶液中,阳极峰随着亚硝酸盐浓度的增加而增加。此外,玉米芯生物炭修饰的碳膏电极对亚硝酸盐检测具有良好的选择性,因为某些干扰组分的循环伏安测量在亚硝酸盐氧化电位范围内不会产生氧化还原峰。这些发现表明,玉米芯生物炭具有开发电化学亚硝酸盐传感器的巨大潜力。
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引用次数: 0
Experimental Study of the Dynamic Behavior of Pulses Emitted by a Linear System of Electromechanical Transducers 机电换能器线性系统脉冲动态特性的实验研究
Q3 Physics and Astronomy Pub Date : 2023-01-01 DOI: 10.21272/jnep.15(3).03027
O. Leiko, A. Derepa, O. M. Pozdniakova, Y. Starovoit, P. Popovych
A significant difference between electrical impulses, used for stimulation of elements of the acoustic location systems, and acoustic pulses, emitted by the systems, that occurs in the systems during their operation, has been discovered experimentally. Physical reasons for the appearance of these differences, for linear systems of electromechanical piezoceramic transducers, are transients in electromechanical oscillatory systems of transducers and spatial spread of the systems. It is shown that the first reason is caused by the inertia of the transducers and the second – by the delay in the wave front when it propagates along the system.Typical dynamical changes in acoustic pulses, depending on the causes of their occurrence, were discovered. It is shown that the inertia of the mechanical oscillatory systems causes smooth increases and decreses, of the front and rear edges of acoustic pulses, respectively, in the directions of main and side lobes of the directivity of the system.It was discovered that typical dynamic changes in acoustic pulses caused by the delay in the front edge of the emitted wave, for the directions that are distant from the main and side lobes and interference zeros of the directivity, led to significant increase of their length, compared to electric ones and to the emergence of dips in the pulses’ amplitudes between their edges and their long sound after the end of the electrical stimulation of the systems’ transducers. Displayed dynamic changes in the emitted acoustic pulses compared to electrical stimulation pulses significantly worsen the parameters of location systems evaluated by the parameters of electrical impulses. Therefore, they must be considered when designing such systems.
实验发现,用于刺激声定位系统元件的电脉冲与在系统运行过程中由系统发出的声脉冲之间存在显著差异。对于线性机电压电换能器系统,产生这些差异的物理原因是换能器的机电振荡系统的瞬态和系统的空间扩散。结果表明,第一种原因是由换能器的惯性引起的,第二种原因是由波前沿系统传播时的延迟引起的。发现了声脉冲的典型动力学变化,这取决于它们发生的原因。结果表明,在机械振荡系统的惯性作用下,声脉冲的前后沿在系统指向性的主叶和副叶方向上分别平滑地增大和减小。研究发现,在远离主瓣和副瓣的方向上,由于发射波前缘的延迟以及指向性的干扰零点,声脉冲发生了典型的动态变化,导致声脉冲的长度比电脉冲明显增加,并且在系统换能器的电刺激结束后,声脉冲的边缘和长声之间的幅度出现了下降。与电刺激脉冲相比,声脉冲发射的动态变化显著恶化了以电脉冲参数评价的定位系统参数。因此,在设计此类系统时必须考虑它们。
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引用次数: 0
Comparative Study of the Performance of Different Modulations in FSO Communication over a Turbulent Channel with Pointing Error 具有指向误差的湍流信道中FSO通信不同调制性能的比较研究
Q3 Physics and Astronomy Pub Date : 2023-01-01 DOI: 10.21272/jnep.15(3).03021
A. Fakchich, M. Bouhadda, R. El Alami, F. M. Abbou, A. Essahlaoui, M. El Ghzaoui, N. R. Medikondu
Free Space Optical (FSO) communication is a method of transmitting data using modulated light waves through free space, such as air or vacuum, instead of using traditional wired or fiber-optic cables. FSO systems typically use lasers or light-emitting diodes (LEDs) as light sources to transmit data, and photodiodes or other light detectors to receive the data. In this paper, we investigate the error performance of a Free Space Optical system using various modulation techniques under different intensity fluctuation conditions. Our analysis takes into account the combined effects of atmospheric turbulence-induced fading and misa-lignment fading on the propagating signal. We derive novel closed-form expressions for the statistics of the random attenuation of the propagation channel for each modulation scheme used. Additionally, we perform a comparative study of bit-error rate (BER) performance for all modulation techniques considered in this work. We present numerical results to evaluate the error performance of all modulation schemes used in FSO systems with the presence of atmospheric turbulence and/or misalignment. Furthermore, we compare the OOK, PPM, DPSK, and BSPK modulation techniques to determine the best modulation that achieves the minimum BER for a given signal-to-noise ratio value equal to 30 dB in different scenarios.
自由空间光通信(FSO)是一种通过自由空间(如空气或真空)使用调制光波传输数据的方法,而不是使用传统的有线或光纤电缆。FSO系统通常使用激光或发光二极管(led)作为光源来传输数据,并使用光电二极管或其他光探测器来接收数据。本文研究了在不同光强波动条件下,采用不同调制技术的自由空间光学系统的误差性能。我们的分析考虑了大气湍流引起的衰落和misa-lignment衰落对传播信号的综合影响。我们推导了用于每种调制方案的传播信道随机衰减统计量的新颖封闭表达式。此外,我们对本研究中考虑的所有调制技术的误码率(BER)性能进行了比较研究。我们给出了数值结果来评估在存在大气湍流和/或不对准的情况下FSO系统中使用的所有调制方案的误差性能。此外,我们比较了OOK、PPM、DPSK和BSPK调制技术,以确定在不同情况下,在给定的信噪比等于30 dB的情况下,实现最小误码率的最佳调制技术。
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引用次数: 0
Effect of HPHT Sintering on Crystal Structure of NbC and TaC Carbides in PcBN Composites of cBN-NbC-Al and cBN-TaC-Al Systems 高温高温烧结对cBN-NbC-Al和cBN-TaC-Al系PcBN复合材料中NbC和TaC碳化物晶体结构的影响
Q3 Physics and Astronomy Pub Date : 2023-01-01 DOI: 10.21272/jnep.15(3).03030
N. Belyavina, D. Stratiichuk, A. Kuryliuk, V. Turkevich, O. Nakonechna, P. Kogutyuk, L. P. Stasuk
Ceramic-matrix composites based on cubic boron nitride (cBN) with binders, containing refractory compounds of transition metals and aluminum, are widely used for high-speed
以立方氮化硼(cBN)为基料,以过渡金属和铝为耐火材料的陶瓷基复合材料在高速公路上有着广泛的应用
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引用次数: 0
Modern Photoactive Nanocomposites Based on TiO2 and CeO2 基于TiO2和CeO2的新型光活性纳米复合材料
Q3 Physics and Astronomy Pub Date : 2023-01-01 DOI: 10.21272/jnep.15(4).04001
M. M. Zahornyi, O. M. Lavrynenko, O. F. Kolomys, V. V. Strelchuk, N. I. Tyschenko, O. A. Korniіenko, A. I. Ievtushenko
.
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引用次数: 0
Interface for Semi-automatic Image Contrast Enhancement in the Propagation-based X-ray Phase Contrast Method 基于传播的x射线相衬法中半自动图像对比度增强的接口
Q3 Physics and Astronomy Pub Date : 2023-01-01 DOI: 10.21272/jnep.15(4).04037
A. V. Polishchuk, M. O. Pavlyuk, A. V. Tarasenko, V. V. Zhurakulov
This paper describes a graphical user interface developed for the normalization of radiograms and semi-automatic search for the most contrast images using a given reference, the experimental data for which were obtained using the analytical technique of X-ray phase contrast imaging. The projections of the biological object were obtained by applying free space propagation of coherent radiation when no additional optical elements are placed between the sample and the detector equipped with a YAG:Ce scintillator to exploit the interference effects characteristic of the method due to the high-intensity characteristics of the X-ray light of the SOLEIL synchrotron. The energy of the X-ray photons was 10 keV, and the distance between the sample and the detector was 16.5 cm. We consider the use of standard Matlab tools for algorithmic correction of inhomogeneities of the detector and probing light beam used to build an image of the internal structure of the object and to evaluate the contrast of a group of images, by choosing such common quality criteria as PSNR and SSIM. The program is able to generate such a set of images depending on the parameters entered by the user for a subjective search for contrast images. Numerical estimates well confirm the visual results of the algorithmic search and allow us to reach the most informative image from the generated array, which is created by the user using the interface. The aim of this work is to familiarize with the use of the developed software product and the concept of semi-automatic search among the dataset of digital phase-contrast images.
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引用次数: 0
Design of a Novel Capsule-Shaped Compact UWB Antenna for 5G Wireless Applications 用于5G无线应用的新型胶囊状紧凑型超宽带天线设计
Q3 Physics and Astronomy Pub Date : 2023-01-01 DOI: 10.21272/jnep.15(4).04031
Suverna Sengar, Praveen Kumar Malik, Subba Reddy V., Sudipta Das
In this paper, a simple and novel Ultra-wideband (UWB) micro strip patch antenna is developed with a compact dimension (15  12  0.8) mm 3 and low complexity. This design improves a number of microwave circuit features, including wide bandwidth, and achieved optimum gain, among others. The proposed antenna is intended to operate in the frequency range from 22 to 29.6 GHz, the antenna is mounted on a Rogers RT Duroid 5880 compact dielectric substrate with a thickness of 0.8 mm and a dielectric constant of ( ε r  2.2). Elliptical slots have been added in the simple capsule shape radiating patch to achieve wideband performance for the proposed antenna structure. The proposed antenna, with a frequency range from 22 to 29.6 GHz, has a wide bandwidth of 7.6 GHz. As a result, the proposed antenna design is small and appropriate for higher frequencies. The results of the simulation confirm that the antenna model is appropriate. In comparison to conventional patch, performance parameters like reflection coefficient, gain, and VSWR has improved. The EM simulator Ansoft HFSS v.15.0 performs all essential simulations, and a thorough comparative analysis based on the current antennas is performed. The suggested antenna has good impedance matching at |S 11 |  – 10 dB, VSWR is less than 2 and peak gain is 6.08 dBi at 24 GHz. Since the suggested antenna resonates at millimeter wave frequencies, it can be used for 5G applications. These excellent results in terms of tiny size, UWB operating band, high gain, good impedance matching, desired radiation features suggest that the proposed antenna would be a decent choice for 5G mm-wave applications.
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引用次数: 0
Surface Laser Melting of a Carburized LPBF-manufactured Ti-based Biomedical Grade Alloy 渗碳lpbf制备的ti基生物医学级合金的表面激光熔化
Q3 Physics and Astronomy Pub Date : 2023-01-01 DOI: 10.21272/jnep.15(4).04035
B. V. Efremenko, Yu. G. Chabak, E. V. Tsvetkova, A. V. Dzherenova, V. G. Efremenko, F. Kromka, V. I. Zurnadzhy, I. M. Olejnik
.
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引用次数: 0
期刊
Journal of Nano-and electronic Physics
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