AIP Advances最新文献_第8页

Segmentation of lung nodules in CT images using weighted average based threshold and maximized variance 使用基于加权平均的阈值和方差最大化技术分割 CT 图像中的肺结节

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-04 DOI: 10.1063/5.0216374

Yankun Liu, Tong Zhang, Ma Liang, Enguo Wang

{"title":"Segmentation of lung nodules in CT images using weighted average based threshold and maximized variance","authors":"Yankun Liu, Tong Zhang, Ma Liang, Enguo Wang","doi":"10.1063/5.0216374","DOIUrl":"https://doi.org/10.1063/5.0216374","url":null,"abstract":"Background: Lung cancer is a major health concern globally, being the primary cause of cancer-related deaths. It accounts for approximately one–sixth of all cancer fatalities. Objective: The goal of this study is to develop an effective method for the early detection of lung tumors using computed tomography (CT) images. This method aims to identify lung tumors of various sizes and shapes, which is a significant challenge due to the variability in tumor characteristics. Methods: The research utilizes CT images of the lungs in sagittal view from the LID-IDRI database. To tackle the issue of tumor variability in size, shape, and number, the study proposes a novel image processing technique. This technique involves detecting tumor clusters using a weighted average-based automatic thresholding method. This method focuses on maximizing inter-class variance and is supplemented by further classification and segmentation processes. Results: The proposed image processing technique was tested on a dataset of 315 lung CT images. It demonstrated a high level of accuracy, achieving a 98.96% success rate in identifying lung tumors. Conclusion: The study introduces a highly effective method for the detection of lung tumors in CT images, irrespective of their size and shape. The technique’s high accuracy rate suggests it could be a valuable tool in the early diagnosis of lung cancer, potentially leading to improved patient outcomes.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"8 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A self-sustaining wireless sensing and flight control device for beetles 甲虫自持式无线传感和飞行控制装置

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-04 DOI: 10.1063/5.0228102

Xin Huang, Wenhao Zhao, Meisong Yuan, Kaixuan Sun, Bo Yang

引用次数: 0

A three-point velocity estimation method for two-dimensional coarse-grained imaging data 二维粗粒度成像数据的三点速度估算方法

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-04 DOI: 10.1063/5.0197251

J. M. Losada, A. D. Helgeland, J. L. Terry, O. E. Garcia

{"title":"A three-point velocity estimation method for two-dimensional coarse-grained imaging data","authors":"J. M. Losada, A. D. Helgeland, J. L. Terry, O. E. Garcia","doi":"10.1063/5.0197251","DOIUrl":"https://doi.org/10.1063/5.0197251","url":null,"abstract":"Time delay and velocity estimation methods have been widely studied subjects in the context of signal processing, with applications in many different fields of physics. The velocity of waves or coherent fluctuation structures is commonly estimated as the distance between two measurement points divided by the time lag that maximizes the cross correlation function between the measured signals, but this is demonstrated to result in erroneous estimates for two spatial dimensions. We present an improved method to accurately estimate both components of the velocity vector, relying on three non-aligned measurement points. We introduce a stochastic process describing the fluctuations as a superposition of uncorrelated pulses moving in two dimensions. Using this model, we show that the three-point velocity estimation method, using time delays calculated through cross correlations, yields the exact velocity components when all pulses have the same velocity. The two- and three-point methods are tested on synthetic data generated from realizations of such processes for which the underlying velocity components are known. The results reveal the superiority of the three-point technique. Finally, we demonstrate the applicability of the velocity estimation on gas puff imaging data of strongly intermittent plasma fluctuations due to the radial motion of coherent, blob-like structures at the boundary of the Alcator C-Mod tokamak.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"13 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A grid tied solar photovoltaic based off board electric vehicle charger in G2V and V2G mode 基于并网太阳能光伏技术的 G2V 和 V2G 模式板外电动汽车充电器

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-04 DOI: 10.1063/5.0212427

Jyoti M. Kumbhare, Sumant G. Kadwane

引用次数: 0

Achievement of low turn-on voltage in Ga2O3 Schottky and heterojunction hybrid rectifiers using W/Au anode contact 使用 W/Au 阳极触点实现 Ga2O3 肖特基和异质结混合整流器的低开启电压

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-03 DOI: 10.1063/5.0227210

Chao-Ching Chiang, Jian-Sian Li, Hsiao-Hsuan Wan, Fan Ren, Stephen J. Pearton

引用次数: 0

On the modulated fifth order dressed electron acoustic electrostatic and energy features in auroral plasma 论极光等离子体中的调制五阶电子声静电和能量特征

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-03 DOI: 10.1063/5.0227184

K. S. Alsadi, E. M. Darwish, E. K. El-Shewy

引用次数: 0

Density functional theory study of physisorption of ionic liquid pairs on hydroxylated and oxygen terminated α-SiO2 (001) surfaces 羟基化和氧端化 α-SiO2 (001) 表面离子液体对物理吸附的密度泛函理论研究

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-03 DOI: 10.1063/5.0221708

Xiangjian Wang, Oleg. N. Antzutkin, J. Andreas Larsson

{"title":"Density functional theory study of physisorption of ionic liquid pairs on hydroxylated and oxygen terminated α-SiO2 (001) surfaces","authors":"Xiangjian Wang, Oleg. N. Antzutkin, J. Andreas Larsson","doi":"10.1063/5.0221708","DOIUrl":"https://doi.org/10.1063/5.0221708","url":null,"abstract":"In this work, we investigate the ion pair tetramethylphosphonium cation, [P1,1,1,1]+, and bis(oxalato)borate anion, [BOB]−, as a model system for the study of ionic liquids interacting with both hydroxylated and oxygen terminated α-SiO2 (001) surfaces, using first-principles electronic structure theory. We use a single ionic pair and clusters of ion pairs, in order to have exclusively neutral supercell slab models. We use dispersion-corrected density functional theory (DFT) to ascertain that both the strong physical binding between the ions, dominated by ionic binding, and the weaker physical binding of ions to the different surfaces are correctly described. We have found that the binding of ion pairs is stronger to the hydroxylated α-SiO2 (001) surface compared to the oxygen terminated surface, which is attributed to the formation of H-binding with the oxygen atom(s) of the [BOB]− anion. Through rotation of ionic pair(s), we estimate the surface-ions energy barrier for translational movement and, thus, the strength of H-binding of the ions. At the surface of hydroxylated α-SiO2 (001), we have studied how water molecules form a network of H-binding with the OH groups of the surface and the [BOB]− anion, which offers an explanation for the reduction in the friction of ionic liquids on the inclusion of water. We suggest modeling protocols for simulation of ion pairs on surfaces, which can open up the possibility to use DFT to aid in designing and understanding the physicochemical mechanism of interactions of ionic materials (including ionic liquids) in various technological applications.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"28 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative bioengineering and optoelectronic properties of metoprolol by DFT, molecular docking, and molecular dynamic approaches 通过 DFT、分子对接和分子动力学方法比较美托洛尔的生物工程和光电特性

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-03 DOI: 10.1063/5.0215159

S. R. Seyyedi Birjand, R. Sabbaghzadeh, Maliheh Azadparvar, H. A. Rahnamaye Aliabad

{"title":"Comparative bioengineering and optoelectronic properties of metoprolol by DFT, molecular docking, and molecular dynamic approaches","authors":"S. R. Seyyedi Birjand, R. Sabbaghzadeh, Maliheh Azadparvar, H. A. Rahnamaye Aliabad","doi":"10.1063/5.0215159","DOIUrl":"https://doi.org/10.1063/5.0215159","url":null,"abstract":"The biophysical properties of metoprolol are investigated by the full potential-linearized augmented plane wave method and molecular docking and molecular dynamic approaches. The exchange–correlation potentials are calculated by the Perdew–Burke–Ernzerhof generalized gradient approximation as implemented in the WIEN2k package. The electronic results show the insulator nature of metoprolol with the indirect bandgap of 3.74 eV between HOMO and LUMO states. In the density of state spectra, the p state of O, C, and N elements confirm the stability of metoprolol. Metoprolol exhibits a metallic behavior in the z direction, while it has a dielectric behavior in the x and y directions. The static refractive indices are obtained 1.49, 1.53, and 1.63 in the x, y, and z directions, respectively. It was found that the maximum reflectivity occurs at the ultraviolet region in the z-direction. The calculated absorption spectra also confirm the other’s experimental results. The obtained results of molecular docking indicate the formation of hydrogen bonds between metoprolol and the beta-2 adrenergic receptors, and molecular dynamics showed a human beta-2 adrenoceptor either in its free state or in complex with a metoprolol molecule. The calculated binding energies of elements by molecular docking and the other biological properties of metoprolol by molecular dynamic are in close agreement with obtained Density Functional Theory (DFT) results for Pharmacia applications.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"3 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and theoretical study on the ceasing motion of a droplet manipulated by air-blowing nozzle 吹气喷嘴操纵液滴停止运动的实验和理论研究

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-03 DOI: 10.1063/5.0208630

Ning Xu, Wen-Ping Xu, Xin Fu, Rui Su, Wen-Yu Chen, Ying-Nan Shen, Jin Luo

{"title":"Experimental and theoretical study on the ceasing motion of a droplet manipulated by air-blowing nozzle","authors":"Ning Xu, Wen-Ping Xu, Xin Fu, Rui Su, Wen-Yu Chen, Ying-Nan Shen, Jin Luo","doi":"10.1063/5.0208630","DOIUrl":"https://doi.org/10.1063/5.0208630","url":null,"abstract":"In this study, the dynamic process of a droplet moving with a substrate until blocked by air flow is investigated experimentally and theoretically. A sequence of experiments has been conducted to investigate the impacts of wetting properties, droplet volumes, air flow velocities, and droplet velocities. The substrate is driven by a linear motion motor to ensure the droplet moves at a certain velocity alongside the substrate. The air flow that is vertically injected from the nozzles toward the substrate is known as an impinging jet. After the air flow impacts the substrate, it will blow horizontally. When the direction of air flow is opposite to that of the droplet movement, a force will be exerted on the surface of the droplet. This action incurs the deformation of the droplet and the cessation of its movement, eventually resulting in an equilibrium state. The droplet shape and motion processes are recorded by a high-speed camera. A mathematical model considering the effect of droplet contact angle, droplet size, droplet moving velocity, and air flow velocity is established in the state of equilibrium. Correlation factors are used in the model for the drag coefficient and air average velocity acting on the droplet. It is found that the air flow rate required to stop the motion of the droplet increases with the droplet moving velocity and the droplet size but reduces with the increase in the static contact angle. The mathematical model, when equipped with suitable correlation factors, exhibits good agreement with experimental data and could potentially be utilized as a predictor of critical velocity for the cessation of the droplet motion.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"100 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on acoustic emission characteristics of metagabbros with different felsic development under splitting load 不同长英质发育的辉长岩在劈裂载荷下的声发射特性研究

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-03 DOI: 10.1063/5.0226321

Tongzhao Zhang, Zhiqiang Liu, Yongsheng He, Hongguang Ji, Yichao Zhao, Zhaoyang Song

{"title":"Research on acoustic emission characteristics of metagabbros with different felsic development under splitting load","authors":"Tongzhao Zhang, Zhiqiang Liu, Yongsheng He, Hongguang Ji, Yichao Zhao, Zhaoyang Song","doi":"10.1063/5.0226321","DOIUrl":"https://doi.org/10.1063/5.0226321","url":null,"abstract":"The acoustic emission (AE) characteristic signal can reveal the mechanical properties of rock materials and the development characteristics of internal microcracks. Rocks with different mineral development characteristics produce different AE signals during fracture. This study selected variable metagabbros with varying feldspathic development for AE tests under splitting load. The results demonstrated that the characteristics of AE ringing counts during the Brazilian fracture of metagabbro were closely correlated with the content of felsic minerals. The cumulative AE ringing count of metagabbros with feldspar nondevelopment exceeded 250 000, while those of metagabbros with feldspar development did not reach 200 000. As the feldspathic mineral content increases, the AE ringing counts of metagabbro exhibit an increasing trend in the high-energy (1e6–+∞ aJ) and high-amplitude (90–100 dB) intervals. With the development of feldspar minerals, the fracture mode of metagabbro gradually changed from shear failure to tensile failure. The higher the development of felsic minerals, the higher the stress level corresponding to the maximum fractal dimension, the greater the energy released by rock failure, and the more severe the damage. This study is of great significance for revealing the mechanism of rock rupture.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"6 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0