2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)最新文献_第5页

Occurrence characteristics and causative mechanisms of daytime L-band scintillations over Dibrugarh, a station at the northern edge of EIA during 2010 – 2014 2010 - 2014年EIA北缘Dibrugarh站点白天l波段闪烁发生特征及成因机制

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738571

Barsha Dutta, B. R. Kalita, P. Bhuyan

{"title":"Occurrence characteristics and causative mechanisms of daytime L-band scintillations over Dibrugarh, a station at the northern edge of EIA during 2010 – 2014","authors":"Barsha Dutta, B. R. Kalita, P. Bhuyan","doi":"10.23919/URSIAP-RASC.2019.8738571","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738571","url":null,"abstract":"Dibrugarh $( 27.5 ^{circ}mathrm {N} , 95 ^{circ}mathrm {E} , 43 ^{circ}$ dip), a location at the northern edge of EIA behaves as low as well as mid latitude location during nighttime. The nighttime L-band scintillations during ascending half of the solar cycle 24 (from January, 2010 to December, 2014) over Dibrugarh are found to be attributed to both equatorial irregularities and sporadic-E (Dutta et al., 2018a). The occurrence characteristics and possible mechanisms of daytime scintillations are investigated and presented in this paper at the same frequency for the same phase of solar cycle. The daytime amplitude scintillations are found to be associated with insignificant phase scintillations, TEC depletions, ROT and ROTI (Figure 1). This implies that no plasma bubbles are formed during daytime scintillations over the location. The association of insignificant TEC depletions/ ROT fluctuations during daytime scintillations were observed earlier at Guilin $( 25.3 ^{circ}mathrm {N} , 110.3 ^{circ}mathrm {E})mathrm {a}$ station near the northern crest of EIA (Zou and Wang, 2009; Zou, 2011) and at equatorial station University Kebangsaan Malaysia (UKM), Malaysiya $( 2.6 ^{circ}mathrm {N} , 101.5 ^{circ}mathrm {E})($ Seif et al., 2012). They reported that daytime scintillations were caused by small scale irregularities in E-region.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126642826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Plasma Wave Scenario in Comets 彗星中的等离子体波

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738542

V. Yadav

引用次数: 1

Variability in Emission Rate of Auto-Rickshaw Based on Real World Driving Profile: A Case Study in Guwahati City 基于真实驾驶工况的机动三轮车排放率变异性研究——以古瓦哈提市为例

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738673

A. Choudhary, S. Gokhale, A. Shukla, P. Kumar, A. K. Singh

{"title":"Variability in Emission Rate of Auto-Rickshaw Based on Real World Driving Profile: A Case Study in Guwahati City","authors":"A. Choudhary, S. Gokhale, A. Shukla, P. Kumar, A. K. Singh","doi":"10.23919/URSIAP-RASC.2019.8738673","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738673","url":null,"abstract":"Auto-rickshaw is an important para-transit mode of urban transportation in India. Cheap in fair but old technology and adulterated fuel quality make it emission intensive. Therefore, this study is aiming the emission assessment of most demanding mode of transportation. The study investigated the variation in the emission rate with respect to operating kinetics by real-world on-road emission measurements of driving profile. The video clips screening revealed that owing to smaller size auto-rickshaw negotiates the traffic, smaller streets and weaves through the mixed traffic which increases frequency of wear and tear engine and increases the emission rate. During peak hours up to 80% of time auto-rickshaw operates in speed 6–28 km/h and acceleration -1 to $1mathrm {m}/ mathrm {s}^{2}$, which subjected to higher frequency of stop-and–go pattern of traffic flow and therefore causing higher engine load, subjected to higher emission rate. Each pollutant showed different behavior for the same variations in speed and acceleration. The emission rates of CO and HC was found higher at speed range12–30 km/h whereas emission rate of NOx and CO2 were found higher speed range of 30–40 km/h. The evaluation of travelling behavior corresponding instantaneous emission of auto-rickshaw concludes that and the improving vehicle flow and reducing frequency of sudden acceleration and deceleration could curb emission rate and reduce fuel consumption.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122997163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Modeling of lower ionospheric response during solar X-ray events using propagating radio wave signal 利用传播无线电波信号模拟太阳x射线事件期间较低电离层响应

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738537

T. Basak, S. Sasmal, S. Chakraborty, S. Chakrabarti

{"title":"Modeling of lower ionospheric response during solar X-ray events using propagating radio wave signal","authors":"T. Basak, S. Sasmal, S. Chakraborty, S. Chakrabarti","doi":"10.23919/URSIAP-RASC.2019.8738537","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738537","url":null,"abstract":"The excess solar X-ray radiation during solar flares causes an enhancement of ionization in the lower ionospheric D-region and hence affects sub-ionospherically propagating Very Low Frequency (VLF) radio wave signal amplitude and phase. VLF signal amplitude and dynamic phase perturbation $(Delta A)$ and amplitude time delay $(Delta t)$ (also the corresponding solar X-ray as measured by GOES-15) of several VLF transmitters such as NWC/19.8 kHz, VTX/18.2 kHz etc. signals have been computed for solar flares. In the first part of the work, using the well-known Long Wave Propagation Capability technique, we simulated the flare induced excess amount of lower ionospheric electron density profile by amplitude perturbation method [1]. Unperturbed D-region electron density is also obtained from simulation with the help of the 2-component D-region model and compared with International Reference Ionosphere-model results. Further, in the second part, we compute the corresponding ‘sluggishness’ through ionospheric time delay and effective electron recombination coefficient $(alpha_{eff})$ analysis [1]. We find that while the time delay is anti-correlated with the flare peak energy flux $(varphi_{max})$ which is independent of solar zenith angle values [2, 3].","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114431607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mid-latitude and high latitude ionospheric disturbances during Sudden Stratospheric Warming events observed by VLF/LF signals VLF/LF信号观测到的平流层变暖事件中中纬度和高纬度电离层扰动

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738682

A. Sen, S. Pal, S. Mondal, Y. Hobara

引用次数: 1

Identification and Estimation of Rainfall Intensity using Microwave Radiometric Measurements 利用微波辐射测量识别和估计降雨强度

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738706

Tuhina Halder, A. Adhikari, A. Maitra

引用次数: 0

Deciphering the weakening of the Indian summer monsoon circulation using a regional climate model RegCM 4.5 利用区域气候模式RegCM 4.5解读印度夏季风环流的减弱

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738175

B. Abish, A. K

引用次数: 0

Novel Design of Printed Antenna Integrated with Bandpass Filter for C-band Applications c波段集成带通滤波器的印刷天线新设计

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738386

P. Shome, T. Khan

{"title":"Novel Design of Printed Antenna Integrated with Bandpass Filter for C-band Applications","authors":"P. Shome, T. Khan","doi":"10.23919/URSIAP-RASC.2019.8738386","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738386","url":null,"abstract":"A novel configuration of filtering antenna for C-band applications is presented in this paper. An elliptical radiator based UWB monopole antenna is first investigated and then integrated to a wideband bandpass filter to achieve high frequency selectivity as well as compactness. The bandpass filter is constituted by stepped impedance stub loaded resonator for C-band applications. Aperture backed inter-digital coupled lines are used to feed the multiple-mode resonator of proposed bandpass filter. The proposed filtenna leaves out the necessity of cascading any additional $50 Omega$ microstrip elements in between the developed antenna and filter, thus making the system smaller. The incorporation of planar antenna and the filter is carried out using FR4 substrate board with permittivity 4.4 and thickness 1.6 mm. The overall dimension of the wideband filtenna is obtained as $59 times 42$ mm $^{2}$. Performance analysis of the UWB antenna, bandpass filter and their integrated structure has been carried out systematically in this paper. An in-depth agreement between simulated and measured results is discovered for the proposed configurations.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128984355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Specific Absorption Rate Measurement various Frequencies of Mobile Phones 不同频率手机的比吸收率测量

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738359

J. Nirala, P. R., J. Behari

引用次数: 0

Deep low frequency image of Coma cluster of galaxies 后发星系团的深低频图像

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-01 DOI: 10.23919/URSIAP-RASC.2019.8738415

D. Lal, C. Ishwara-Chandra

引用次数: 0