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Perturbations in Earth's Atmosphere over An Indian Region during the Total Solar Eclipse on 22 July 2009

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Journal of Meteorological Research 2019年第4期33卷 784-796页

作者： S.B.surendra PRASAD Vinay KUMAR K.Krishna REDDY S.K.DHAKA Shristy MALIK M.Venkatarami REDDY U.Murali KRISHNA Semi-arid-zone Atmospheric Research Centre SARC Department of Physics Yogi Vemana University Radio and Atmospheric Physics Lab Rajdhani College University of Delhi Department of Applied Physics Delhi Technical University

During a total solar eclipse(TSE) on 22 July 2009, atmospheric perturbations were monitored from the surface to thermosphere to understand TSE’s impact on the meteorological(temperature, relative humidity, wind speed, and wind direction) and chemical(O3and NOx) parameters around Kadapa(14.28°N, 78.42°E), a tropical semi-arid region of India. For this purpose, an experiment was conducted at Yogi Vemana University Campus, Kadapa, India, to measure the temperature, wind speed, wind direction, and concentrations of ozone(O3), NO, NO2, and NOxby using the automatic weather station(AWS) and O3analyzer. On the eclipse day(22 July 2009), the surface observations at Kadapa showed a reduction in temperature(about 1.1°C) because of the solar insulation. Comparison of the thermal,dynamical(wind), and chemical parameters on the TSE day with control days [preceding(21 July 2009) and succeeding(23 July 2009) the TSE] illustrated the influence of solar eclipse. During the eclipse period, the O3mixing ratio decreased, while NO2and NOxincreased; however, NO remained unchanged. In addition, radio occultation(RO)temperature profiles from Constellation Observing System for Meteorology, Ionosphere, and Climate(COSMIC)/Formosat Satellite Mission(FORMOSAT-3) and Thermosphere, Ionosphere, and Mesosphere Energetics and Dynamics(TIMED) satellites were utilized to understand the impact of TSE on dynamics of the middle and upper atmosphere from tropopause to the thermosphere. High vertical resolution COSMIC observations revealed that during the solar eclipse, tropopause was cooler with twin peaks(double tropopause). The lower thermosphere between 110 and 130 km became warmer during the TSE, which might be caused by the dynamical response of the atmosphere in this region to the solar eclipse. The experimental data have provided very fine-scale variations of the atmospheric parameters both in time and height and also constituted a new set of results on TSE for further research.

关键词： total solar eclipse(TSE) atmospheric perturbations tropopause dynamics COSMIC/FORMOSAT-3 satellite radio occultation(RO) observations

Almond gum assisted synthesis of Mg doped Fe_(2)O_(3) NPs:Structural analysis,electrochemical sensing,and optical applications

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ChemPhysMater 2022年第4期1卷 330-337页

作者： Madanakumara Hanumanthappa Jayanna Halepoojar Siddalingappa Yellamagad Channabasaveshwara Soundeswaran Sundararajan Mruthyunjaya Vishwas Shyamala Kurki Srinivasaiah surendra Boppanahalli Siddegowda Basavaraju Nandeesh Department of Physics Dr Ambedkar Institute of TechnologyBangalore 560056India Department of Physics Kuvempu UniversityShankaraghatta Shimoga 577451India Yellamagad Channabasaveshwara c Soundeswaran Sundararajan Mruthyunjaya Vishwas e Shyamala Kurki Srinivasaiah fSurendra Boppanahalli Siddegowda School of Physics and Geology Nrupathunga UniversityBangalore 560001India Department of Physics Mount Carmel CollegeBangalore 560001India Department of Chemistry Dayananda Sagar College of EngineeringBengaluru 560078India Department of Physics East West Institute of TechnologyBangalore 560091India

Mg-doped Fe_(2)O_(3)nanoparticles(M-FNPs)are successfully prepared first time by facile green-aided(almond gum)combustion *** structural analysis of synthesized nanoparticles was well analyzed by Powder X-ray Diffrac-tion(PXRD),Fourier Transform Infrared spectroscopy(FT-IR),Scanning Electron Microscope(SEM),Raman spec-troscopy and UV-Visible spectral *** showed a nanocrystalline nature and determined the average particle size to be 85 *** surface morphologies of the prepared nanocomposite was measured by SEM tech-nique reveals the porous and spongy like *** photodegradation activity on 20×10^(−6)of Fast Orange Red(FOR)organic model dye using M-FNPs(50 mg)under UV light irradiation was investigatedin ***-trochemical examination of the prepared material was conducted using graphite-M-FNP electrode paste in 0.1 M KCl solution,and its performance in redox reaction was determined to be very good via cyclic voltammetry and electrochemical impedance ***,an extension to sensor studies revealed broad differences in redox positions for paracetamol sensors,at 0.64 V and 0.41 V,confirming highly chemical sensor activity in alkaline medium for 1∼5 mM concentrations.

关键词： Mg doped Fe_(2)O_(3)photocatalyst Green combustion Electrochemical analysis Photocatalysis

Synchronized Chaos in a Modulated Bidirectional Ring Laser

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Synchronized Chaos in a Modulated Bidirectional Ring Laser

第十二届全国量子光学学术会议

作者： surendra Singh Fuad Rawwagah Physics Department University of Arkansas FayettevilleAR 72701USA Physics Department University of Arkansas FayettevilleAR 72701USA

＜正＞Nonlinear dynamics of a pump-modulated bidirectional solid-state ring laser are studied theoretically and experimentally. Theoretical investigations are based on the semiclassical equations of motion for an optically pumped bidirectional ring laser that supports single mode in each direction. These equations include coupling of

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第7肋软骨移植矫正鞍鼻畸形临床研究

第7肋软骨移植矫正鞍鼻畸形临床研究

作者： YADAV surendra PARSAD 昆明医科大学

学位级别：硕士

目的评估第7肋软骨移植矫正鞍鼻畸形的效果和安全性。方法自2013年1月～2017年3月,对32例鞍鼻畸形(10例男性,22例女性)平均年龄在25岁(12～30岁),14例为创伤后鼻畸形,10例为先天性鼻畸形,8例为唇裂继发鞍鼻畸形患者,切取第七肋软骨移植... 详细信息

目的评估第7肋软骨移植矫正鞍鼻畸形的效果和安全性。方法自2013年1月～2017年3月,对32例鞍鼻畸形(10例男性,22例女性)平均年龄在25岁(12～30岁),14例为创伤后鼻畸形,10例为先天性鼻畸形,8例为唇裂继发鞍鼻畸形患者,切取第七肋软骨移植矫正鞍鼻畸形,唇裂继发鞍鼻畸形患者同时进行了患侧鼻基底移植,观察切取软骨时间、获取软骨的长度,术后观察肋软骨移植后效果、供区瘢痕等并发症,对肋软骨移植隆鼻效果和安全性进行评估。结果平均切取肋软骨时间为30分钟,肋软骨长度为4.5 cm。术后30例得到随访,随访时间3～24个月,除1例出现感染,经换药后软骨部分吸收;3例出现鼻根部位偏斜,1例出现固定钢针外露,2例出现胸部瘢痕增生外,全部病例鞍鼻得到矫正,对手术效果满意。结论第7肋软骨量充足,容易切取,移植后能取得很好的临床效果,是矫治重度鞍鼻畸形的理想移植物。

关键词：自体肋软骨鼻整形鞍鼻移植

Mineralogy, liberation and leaching characteristics of iron oxide phases in an Indian diaspore sample

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Transactions of Nonferrous Metals Society of China 2018年第8期28卷 1640-1651页

作者： Danda Srinivas RAO Swagat S.RATH Nilima DASH Swagatika MOHANTY surendra K.BISWAL Council of Scientific and Industrial Research Institute of Minerals and Materials Technology

The removal of iron from an Indian diaspore sample was studied using magnetic separation and leaching techniques aided by an in-depth mineralogical characterization study involving quantitative mineralogical evaluation by scanning electron microscope（QEMSCAN）, electron probe micro-analyzer（EPMA） and X-ray diffraction（XRD）. The characterization studies indicate that extremely fine-sized hematite grains are associated with several other mineral phases in a complex manner with around 60% of the hematite not liberated even below the size of 38 μm limiting the scope of physical separation processes to remove the iron. Wet high intensity magnetic separation（WHIMS） studies reveal that only 49% of iron can be removed. Further, leaching studies using oxalic acid suggest that around 76% of the iron can be removed under conditions such as a solid to liquid ratio of 0.05：1, a temperature of 90 ℃ a time period of 120 min and an acid concentration of 1 mol/L. The dissolution of iron in oxalic acid is found to be controlled by chemical reaction and the activation energy is calculated as 35.15 k J/mol.

关键词： diaspore liberation mineralogy leaching magnetic separation

Coherence Properties of Light from Optical Parametric Oscillators

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Coherence Properties of Light from Optical Parametric Oscill...

The Dispersion Characteristics of a One Dimensional Plasma Photonic Crystal Having Inhomogeneous Plasma Density Profiles

第十二届全国量子光学学术会议

作者： surendra Singh Reeta Vyas Physics Department University of Arkansas FayettevilleAR 72701USA Physics Department University of Arkansas FayettevilleAR 72701USA

＜正＞Nonclassical light beams generated by degenerate and non-degenerate optical parametric oscillators （ OPO） have played a significant role in studies of squeezing, entanglement and other nonclassical properties of light. Fluctuation properties of these nonclassical light beams have been studied by using various coherent state representations of the field density matrix. Here we discuss the use of positive-P representation of the density matrix

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Optics and Photonics Journal 2012年第3期2卷 222-229页

作者： surendra Prasad Vivek Singh A. K. Singh Department of Physics Banaras Hindu University Varanasi India

The dispersion characteristics of binary 1D-PPCs having inhomogeneous plasma in the unit cell are studied. Using the transfer matrix method the required dispersion relations are obtained. Here the linear and exponential plasma density profiles are considered and compared with the homogeneous plasma having uniform density profile. It is observed that the inhomogeneity in plasma layer highly affect dispersion curves. By comparing the dispersion curves obtained in all considered cases, it is found that the widths of band gaps and phase velocities are always larger for exponential density profile than the linear uniform density profiles in the considered frequency range.

关键词： Plasma Photonic Crystal Inhomogeneous Plasma Density Dispersion Characteristics Linear Plasma Density Profile Exponentially Plasma Density Profile

Development of Emission Factors for Quantification of Blasting Dust at Surface

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Journal of Environmental Protection 2010年第4期1卷 346-361页

作者： surendra Roy Govind Raj Adhikari Trilok Nath Singh 不详

Environmental impact assessment (EIA) and environmental management plan (EMP) is a statutory requirement for execution of new mining projects or for expansion of the operating projects. For this purpose, quantification of blasting dust emission is required. This can be done by developing emission factors for blasting. The concept is similar to that of specific charge in blasting. For mining operations other than blasting, quantification of dust can be done using emis- sion factors. Emission estimation techniques are very limited for blasting. In this study, the emission factors were de- veloped by carrying out a detailed field study at one of the largest opencast coal mines of India in all four seasons. Da- ta on atmospheric and meteorological conditions were generated by installing sodar and automatic weather station at the mine site. Respirable dust samplers were installed for monitoring of the dust emitted during coal or overburden bench blasting. Emission factors for dust concentrations were developed in gram per cubic meter of rock excavated. The developed emission factors were used to estimate dust emissions for adjacent mines due to similarity in mining and meteorological conditions. Seasonal variations in moisture contents in benches, where dust was monitored, indicated the lowest emission factors in monsoon due to high moisture in the bench materials. Similar field studies were also conducted at another coalfield of India for two seasons. It was found that the emission factors are site-specific.

关键词： Emission Factor Blasting Dust Particulate Matter Surface Coal Mines

Improving Strawberry Irrigation with Micro-Sprinklers and Their Impact on Pest Management

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Agricultural Sciences 2016年第12期7卷 859-868页

作者： surendra K. Dara Samuel Sandoval-Solis David Peck University of California Cooperative Extension San Luis Obispo CA USA Department of Land Air and Water Resources Davis CA USA Manzanita Berry Farms Santa Maria CA USA

Overhead aluminum sprinklers, which are used during the early stages of strawberry crop development to establish transplants and to leach out salts from the root zone, deliver significant volumes of water. Micro-sprinklers, which are typically used in orchard crops, were evaluated in a commercial strawberry field in California as an alternative to conventional aluminum sprinklers to conserve water without any negative impact on yields. In addition to the water consumption, data were collected from multiple plots within each treatment to determine the impact on plant growth, disease incidence, and seasonal yield. Micro-sprinklers used 32% less water than aluminum sprinklers during a three-week period without affecting fruit yield. They also appeared to lessen the severity of powdery mildew and botrytis fruit rot. This is the first study reporting the use of micro-sprinkler system, which can be a good alternative to the aluminum sprinklers to conserve irrigation water.

关键词： Strawberry Irrigation Micro-Sprinkler Powdery Mildew Botrytis Fruit Rot