Journal of Electrostatics最新文献_第9页

Effect of high static electric field on germination and early stage of growth of Avena sativa and Raphanus sativus 高静电场对莜麦和油菜发芽和早期生长的影响

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-06-07 DOI: 10.1016/j.elstat.2024.103939

Adam Pelesz , Marta Fojcik

{"title":"Effect of high static electric field on germination and early stage of growth of Avena sativa and Raphanus sativus","authors":"Adam Pelesz , Marta Fojcik","doi":"10.1016/j.elstat.2024.103939","DOIUrl":"https://doi.org/10.1016/j.elstat.2024.103939","url":null,"abstract":"<div><p>Presented study investigated the impact of a stationary electric field with an average value of 185 kV/m on the germination process and early growth of radish (<em>Raphanus sativus</em> – a eudicot plant) and oat (<em>Avena sativa</em> – a monocot plant). Electric field stimulation may prove to be one method to sustainably increase crop efficiency. The research is aimed to increase knowledge of the effect of a static electric field on the plant growth process, because understanding of the topic is still limited. The plants were grown on a viscose substrate in a dark room without any light. Studies have shown that the electric field can affect the germination and growth process depending on the plant species. The findings indicate a positive influence of the electric field on radish germination. The presence of the electric field accelerates the germination process and growth of young plants. On the first day of germination (the 3rd day of cultivation), about 3.2 times as many plants germinated in the samples exposed to a stationary electric field compared to the control samples. On the last day of the experiment (the 8th day of cultivation), the tallest plants in the samples subjected to the electric field were 8 % higher, compared to the tallest plants in the control samples. On the other hand, the results demonstrate a negative impact of the electric field on oat seed germination. The presence of an electric field delays the germination process and reduces the number of germinated seeds. On the last day of the experiment (the 11th day of cultivation), about 1.25 times fewer oat plants germinated in the samples exposed to a stationary electric field compared to the control samples. The tallest plants in the samples subjected to the electric field were 1.1 times smaller than the tallest plants in the control samples.</p></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"130 ","pages":"Article 103939"},"PeriodicalIF":1.8,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141292333","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

Experimental study of aerosol behavior in ambient electric and magnetic fields at low indoor relative humidity 低室内相对湿度环境电场和磁场中气溶胶行为的实验研究

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-06-04 DOI: 10.1016/j.elstat.2024.103937

John Voccio , Mansour Zenouzi , Andrew Seredinski , Ali Khabari , Scott Young , Terris Reddick , Andrew Lanzrath , Aiyana Weekes-Tulloch , Marcel Almonte , Jorgo Ruci , Priyansh Sharma

{"title":"Experimental study of aerosol behavior in ambient electric and magnetic fields at low indoor relative humidity","authors":"John Voccio , Mansour Zenouzi , Andrew Seredinski , Ali Khabari , Scott Young , Terris Reddick , Andrew Lanzrath , Aiyana Weekes-Tulloch , Marcel Almonte , Jorgo Ruci , Priyansh Sharma","doi":"10.1016/j.elstat.2024.103937","DOIUrl":"https://doi.org/10.1016/j.elstat.2024.103937","url":null,"abstract":"<div><p>The tendency of aerosols to carry viral particles featured significantly in public discourse during the SARS Covid-19 pandemic. In this research, the potential significance of the aerosol electric charge, especially as it relates to indoor relative humidity (RH) is considered. While electrostatic interactions may occur at any level of humidity, the level of humidity has a strong influence on these interactions. Above 55 % RH, there is sufficient moisture in the air to facilitate neutralization of the electric charges of particles and surfaces, whereas, at lower humidity levels, less moisture and higher surface resistivities enable increasingly stronger electrostatic interactions. Experiments were designed and conducted to study the behavior of electrically charged aerosols in fields emanating from capacitive touchscreens and permanent magnets. These preliminary experimental results suggest that operating indoor environments closer to the 55–60 % RH range could reduce interactions between these charged aerosols and capacitive touchscreens. This relative humidity range is within the acceptable ranges of humidity recommended by ASHRAE standard 55 which defines thermal environmental conditions for human occupancy.</p></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"130 ","pages":"Article 103937"},"PeriodicalIF":1.8,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141245035","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

Optimization of an electric field calibration chamber for high-precision measurements for imaging applications 优化用于成像应用高精度测量的电场校准室

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-06-03 DOI: 10.1016/j.elstat.2024.103938

Ross Adelman, Timothy M. Pritchett, David M. Hull, Alex George, Sean Heintzelman

{"title":"Optimization of an electric field calibration chamber for high-precision measurements for imaging applications","authors":"Ross Adelman, Timothy M. Pritchett, David M. Hull, Alex George, Sean Heintzelman","doi":"10.1016/j.elstat.2024.103938","DOIUrl":"https://doi.org/10.1016/j.elstat.2024.103938","url":null,"abstract":"<div><p>The DEVCOM Army Research Laboratory (ARL) electric field “cage” generates a uniform E-field over a large working volume, along the lines of the IEEE-Std 1308–1994. The end plates are spaced farther apart than the IEEE standard field source, and the fringing fields are controlled by the addition of “guard tubes.” This chamber was originally constructed to calibrate and characterize electric field sensors, and it has been redesigned to support quasi-static electric field imaging applications. A planar array of sensors forms a grounded end plate of the cage and is used to measure distortions in the uniform field generated by the cage due to objects placed inside. However, the array itself distorts this field and introduces significant errors. Several modifications were made to mitigate the errors, including adding nonfunctional “dummy” elements, a border around the array, and a back plane behind it. The parameter space for these additions is very large, since the number of nonfunctional elements, the width of the border, and the size and placement of the back plane can all be tuned independently. Extensive computer modeling was used to explore this parameter space and test thousands of possible designs. The design chosen yields modeled absolute field errors over a 1.2-m × 0.8-m sensing plane that are less than 0.5 % for a uniform ambient field (empty cage), and less than 1 % for a sphere with a 0.5-m radius in an ambient field.</p></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"130 ","pages":"Article 103938"},"PeriodicalIF":1.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141242509","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

Measurement of transferred charge in brush discharges from insulating materials 绝缘材料电刷放电中转移电荷的测量

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-06-01 DOI: 10.1016/j.elstat.2024.103901

Paul Holdstock

引用次数: 0

Electrostatic charging of material webs in production machines and how to eliminate it 生产设备中材料卷筒的静电荷及其消除方法

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-05-29 DOI: 10.1016/j.elstat.2024.103934

Wolfgang Schubert , Atsushi Ohsawa

引用次数: 0

EHD gas pump as a cooling device for electronic components in a horizontal channel 作为水平通道中电子元件冷却装置的 EHD 气体泵

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-05-26 DOI: 10.1016/j.elstat.2024.103935

S.-F. Cheng , J.C. Leong , F.C. Lai

{"title":"EHD gas pump as a cooling device for electronic components in a horizontal channel","authors":"S.-F. Cheng , J.C. Leong , F.C. Lai","doi":"10.1016/j.elstat.2024.103935","DOIUrl":"https://doi.org/10.1016/j.elstat.2024.103935","url":null,"abstract":"<div><p>Previous studies have shown that electrohydrodynamic (EHD) gas pumps are a viable alternative for traditional fans. In this study, it further demonstrates that an EHD gas pump is a device particularly ideal for cooling electronic components. To this end, four electronic components which are individually mounted on each wall of a horizontal channel are cooled by a two-stage EHD gas pump. To evaluate the effectiveness of EHD gas pump, two electrode configurations are considered; aligned and offset. Three heat dissipation rates are considered: 100 W/m<sup>2</sup>, 200 W/m<sup>2</sup> and 500 W/m<sup>2</sup>. The average surface temperature and the maximum temperature (i.e., the hot spot) of each electronic component are carefully examined. The results are compared with those obtained without using an EHD pump. It shows that an EHD pump with offset electrode configuration produces the best cooling effect as it generates more mixing of flow inside the channel. The average surface temperature and the maximum temperature on the electronic components cooled by EHD gas pump with offset configuration are lower than those cooled by EHD pump with aligned electrodes. More importantly, the results show that the performance of EHD pumps in terms of energy efficiency may be further improved when the two stages are operated in uneven voltages.</p></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"129 ","pages":"Article 103935"},"PeriodicalIF":1.8,"publicationDate":"2024-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141097443","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

How fast does a static charge decay? An updated review on a classical problem 静电荷的衰减速度有多快？经典问题的最新回顾

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-05-25 DOI: 10.1016/j.elstat.2024.103930

Philippe Molinié

{"title":"How fast does a static charge decay? An updated review on a classical problem","authors":"Philippe Molinié","doi":"10.1016/j.elstat.2024.103930","DOIUrl":"https://doi.org/10.1016/j.elstat.2024.103930","url":null,"abstract":"<div><p>Understanding and modelling the static charge decay on an insulating material surface have been the topic of numerous research works since the nineteenth century. After an introduction on this historical context, a selection is presented here covering the various phenomena that may be held responsible for the decay: ion deposit from the surrounding atmosphere, charge injection and transport through the conduction and trapping levels of the solid, internal polarization by free carrier motion or dipole polarization, as well as surface conduction and migration of the deposited charge along the surface.</p><p>Surface potential measurements are a convenient technique to study these various types of charge motion but the underlying complexity concerning their interpretation is often neglected. Depending on the context, the law of electrostatics may produce a hyperbolic as well as an exponential decay. On an insulating polymer, or any other disordered insulator, charge transport is dispersive, and conduction as well as dipolar polarization responses are described by time power laws. The knowledge of this time response is not sufficient to build a convincing physical model, because of the universality of this response, which leaves many degrees of freedom to interpret the data. Knowledge of the possible elementary processes and their signatures in the observables is therefore requested before the implementation of curve-fitting procedures.</p></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"129 ","pages":"Article 103930"},"PeriodicalIF":1.8,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141095323","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

Properties of PM and gaseous products generated by low-power domestic boiler after wood combustion and removed by electrostatic precipitator 小功率家用锅炉燃烧木材后产生的、经静电除尘器去除的可吸入颗粒物和气态产物的特性

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-05-24 DOI: 10.1016/j.elstat.2024.103931

T. Czech , A. Marchewicz , A. Krupa , A.T. Sobczyk , T. Turzyński , M. Gazda , A. Jaworek

{"title":"Properties of PM and gaseous products generated by low-power domestic boiler after wood combustion and removed by electrostatic precipitator","authors":"T. Czech , A. Marchewicz , A. Krupa , A.T. Sobczyk , T. Turzyński , M. Gazda , A. Jaworek","doi":"10.1016/j.elstat.2024.103931","DOIUrl":"https://doi.org/10.1016/j.elstat.2024.103931","url":null,"abstract":"<div><p>In this paper, the elemental composition and morphology of fly ash particles after wood pellets combustion in low-power domestic boiler and removed by electrostatic precipitator were investigated by EDS, XRD and SEM methods. The gaseous products discharged into the atmosphere were identified by the FTIR method. Because fly ash particles are usually exhausted to the atmosphere, new constructions of small electrostatics precipitators for domestic use were proposed in recent years in the literature, for the collection of fly ash particles emitted by such boilers fired by biomass fuel (wood pellets) or by coal. The goal of this study was to characterize the combustion products retained at various places from boiler to stack, i.e., beneath the grating (as bottom ash), on heat exchanger, inner walls of stack, and the collection electrodes of electrostatic precipitator. It was shown that the precipitated biomass fly ash comprises of large irregular particles, which were the agglomerates of primary nanoparticles or unburned fragments of fuel (biomass pieces). These particles were composed mainly of K, Cl, Ca, C, O, P and S (>1 at.%).</p></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"129 ","pages":"Article 103931"},"PeriodicalIF":1.8,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141090160","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

DC electric field sensor in a grounded enclosure with height adjustable pin 接地外壳中的直流电场传感器，带高度可调插销

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-05-22 DOI: 10.1016/j.elstat.2024.103936

Tao Chen, Brandon Hill, Sadna Isik, Cyrus Shafai, Lot Shafai

引用次数: 0

Cylindrical multipole expansion of electrostatic potential in form of triple sum of associated Legendre polynomials 以相关 Legendre 多项式三重和的形式对静电势进行圆柱多极扩展

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-05-20 DOI: 10.1016/j.elstat.2024.103932

Filip Vučić

引用次数: 0