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Ultra-thin Bloch-surface-wave-based reflector at telecommunication wavelength

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Photonics Research 2017年第5期5卷 494-499页

作者： R. dubey B. VOSOUGHI LAHIJANI M. HAYRINEN M. ROUSSEY M. KUITTINEN H. P. HERZIG Optics & Photonics Technology Laboratory (OPT) ecole Polytechnique Federale de Lausanne (EPFL) rue de la Maladiere 71b Institute of Photonics University of Eastern Finland

We experimentally demonstrate the optical properties of gratings engraved in a single-mode waveguide fabricated on top of a dielectric multilayer platform. The structure can be approached as a reflector for Bloch-surface-wavebased two-dimensional optical systems. The gratings have been fabricated on a thin(～λ∕25) titanium dioxide layer with a thickness of a few tens of nanometers deposited on the top of a multilayer platform. The optical properties of the gratings have been characterized in the near field with the aid of multi-heterodyne scanning nearfield optical microscopy. We investigate the surface wave's interference pattern, produced by incident and reflected light in front of the gratings. The presented gratings behave as an efficient Bloch-surface–wave-basedreflector at telecommunication wavelength.

关键词： reflector Bloch waveguide multilayer behave grating Bragg dielectric titanium fabrication

GEOLOGICAL STUDIES OF METAMORPHIC ROCKS IN THE VICINITY OF M.C.T./LESSER HIMALAYAN SHEAR ZONE, PARTS OF SIKKIM HIMALAYAS

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地学前缘 2000年第S1期7卷 33-35页

作者： Chandra Shekhar dubey(Department of Geology, University of Delhi, Delhi\|110007, India)

The Eastern Sikkim area forming a part of the Lesser Himalaya is located between 27°10′～27°30′N latitudes and 88°25′～88°40′E longitudes (750km 2). The previous workers agreed that a domal structure is present in Sikkim which is constituted by low to high grade metamorphic rocks characterised by inverted metamorphism. The rocks were repeatedly deformed and were metamorphosed at about 550 to 770℃ (550 to 750MPa). Geologically, the oldest rocks of Eastern Sikkim are represented by Darjeeling Formation showing medium to high grade metamorphism. It is followed by low grade Daling Formation which is characterised by tectonic wedges of Lingtse gneiss. The potassic syenite intrusive i.e. the Sikkim igneous formation is youngest rock type of the area. The Darjeeling Formation associated with amphibolite bands consists of kyanite\|sillimanite, staurolite and garnet zones, while the Daling Formation is characterised by low grade chloritoid and chlorite zones. Lingtse Formation is gneissic in which patches of retrograded and sheared garnet schists are present. Intrusions of potassic syenites (Sikkim Formation) occur in the form of oval and concordant bodies. The F 1, F 2 and F 3 folds are well developed in rocks of Eastern Sikkim area.. The F 1 folds are rootless, tightly isoclinal or reclined and highly obliterated in their attitude. The F 2 folds belong to class IC of Ramsay (1967). Their interlimb angles vary from 20～50 degrees. Intersection lineation due to S 0/S 1 and S 2 surfaces is parallel to the F 2 folds axis. Third generation structures are represented by open to moderately tight and kinked folds. Superimposition of F 3 folds on F 2 folds resulted into type II interference pattern of Ramsay (1967). Structural analysis of these folds have revealed that F 2 folds are non\|cylindrical. The kink or F 3 folds were possibly responsible for the formation of a megakink resembling with the domal structure. The repeatedly deformed rocks of Eastern Sikkim area were folded, faul

关键词： metamorphic rocks M C T/LESSER Himalayan shear zone Sikkim Himalayas

Effect of Base Width and Stiffness of the Structure on Period of Vibration of RC Framed Buildings in Seismic Analysis

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Open Journal of Earthquake Research 2015年第2期4卷 65-73页

作者： Prakash Sangamnerkar Sheo Kumar dubey Department of Civil Engineering Maulana Azad National Institute of Technology Bhopal India

Fundamental natural period of vibration T of the building is an important parameter for evaluation of seismic base shear. Empirical equations given in the Indian seismic code for the calculation of the fundamental period of a framed structure, primarily as a function of height, do not consider the effect of stiffness of the structure, base dimensions of the structure, number of panels in both the directions, amount of infill and properties of the infill. The fundamental period can be evaluated using simplified expressions found in codes, which are based on earthquake recordings in existing buildings, laboratory tests, numerical or analytical computations. These technical codes provide expressions which depend on basic parameters such as building height or number of stories. Building periods predicted by these expressions are widely used in practice although it has been observed that there is scope for further improvement in these equations since the height alone is inadequate to explain period variability. It is also known that the period of a RC frame structure differs depending on whether the longitudinal or transverse direction of the structure is considered. The aim of this study is to find the effects of building base width in both the directions, stiffness of the structure etc. and to predict the fundamental period of vibration of reinforced concrete buildings with moment resisting frames (MRF). A few examples of dynamic analysis are presented in this study to show the effect of base dimensions and stiffness of the structure in calculating the time period of the structure. And it is recommended to be incorporated in the formula for evaluating the natural period of vibration of structures.

关键词： Base Dimensions Dynamic Analysis Natural Period of Vibration Stiffness

Probiotic Screening of Lactobacilli Isolates from Uttapam Batter Fermented Supplementing with <i>Piper betle</i>L. Leaves

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Advances in Microbiology 2015年第13期5卷 858-870页

作者： Ashwini Kumar dubey Kadirvelu Jeevaratnam Department of Biochemistry and Molecular Biology Pondicherry University Puducherry India

The in vitro screening of lactobacilli isolates from uttapam batter, fermented supplementing with Piper betle L. leaves, was performed in order to select potent isolates for probiotic use. Their resistance to simulated gastric and intestinal juices as well as their adhesion to epithelial intestinal HCT-15 and vaginal HeLa cell lines were assessed and also evaluated for their immunomodulatory ability in ex vivo condition. Isolates were able to adhere as well as reduce pathogen adhesion to monolayer cell lines’ surfaces and reduced production of pro-inflammatory cytokine TNF-α in LPS treated PBMCs, while enhanced that of anti-inflammatory cytokine IL-10. The isolates exhibited properties of auto-aggregation, co-aggregation, hydrophobicity, bile salt hydrolase activity and strong antimicrobial activity against pathogenic bacteria. Thus, the different lactobacilli isolates displayed potent probiotic and immunomodulatory properties among which AJ7 and AJ82 had a great potential and may have applications in fermented foods as immunomodulatory probiotic additives.

关键词： Acid Tolerance Adhesion Immune Modulation Lactobacilli Probiotic

成虫体型大小驱动六斑月瓢虫性间相互选择(英文)

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昆虫学报 2016年第2期59卷 209-218页

作者： Ankita dubey OMKAR Geetanjali MISHRA Department of Zoology University of Lucknow

【目的】配偶选择是性选择的中心过程,当繁殖成本发生波动和配偶质量存在差异时,传统的性别作用也随之不同。为了验证在某些条件下雄性也可以像雌性一样进行选择,我们研究了雄性和雌性六斑月瓢虫Menochilus sexmaculatus(Fabricius)的... 详细信息

【目的】配偶选择是性选择的中心过程,当繁殖成本发生波动和配偶质量存在差异时,传统的性别作用也随之不同。为了验证在某些条件下雄性也可以像雌性一样进行选择,我们研究了雄性和雌性六斑月瓢虫Menochilus sexmaculatus(Fabricius)的交配成功率与作为适合度指标的成虫体型大小之间的关系。【方法】从初始种群中随机选择体型小和体型大的两性成虫,进行雄性和雌性配偶选择试验。并对成功交配的各个配对组的后代也进行配偶选择试验,测试其交配成功率。【结果】配偶选择试验结果表明,在雄性和雌性交配试验中交配的成功取决于体型大小。雄性根据其品质即体型大小这一繁殖力指标对雌性进行区分。同样,在雌性交配试验中体型大的雄虫比体型小的雄虫交配成功率高。无论亲本体型如何,体型大的雌虫都比体型小的雌虫产卵量高;不过,体型大小不影响卵的存活力。体型大的亲本的后代比体型小的亲本的后代发育更快,寿命更长,但是将其与来自初始种群的后代进行配偶选择时,它们在性合意(sexual desirability)或竞争力方面没有表现任何优势。【结论】六斑月瓢虫中存在以体型大小为目的性状的相互配偶选择。

关键词：六斑月瓢虫适合度配偶选择交配成功繁殖产量性竞争

Multidimensional QSAR Modeling of Amprenavir Derivatives as HIV-Protease Inhibitors

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Open Journal of Medicinal Chemistry 2011年第1期1卷 1-15页

作者： Sonal dubey G. Gowtham KLE University"s College of Pharmacy

A computational study has been performed on a series of 55 compounds having (S)-N-(3-(N-(cyclopean- tylmethyl)substituted-phenylsulfonamido)-2-hydroxypropyl)acetamide backbone as HIV-1 protease inhibitors. Various combinations of these specific inhibitors fragments were formed by breaking them at central alicyclic single bonds, while retaining the core. Standard Topomer 3D models were automatically constructed for each fragment, and a set of steric and electrostatic fields was generated for each set of topomers. The models generated showed r2 of 0.811 and crossvalidated r2 (q2) of 0.608. The other method used were Quasar and Raptor based on receptor-modelling concept (6D-QSAR) and this explicitly allows for the simulation of the induced fit, that yielded r2 of 0.574, cross-validated r2 (q2) of 0.504 and predictive r2 (q2) of 0.895 averaged over 200 models. This study has suggested the various type of substituent that can be attached to the core. The information obtained from these 3-D contour maps can be used for the design of amprenavir analogs possessing better protease inhibitory activity.

关键词： 3D-QSAR 5D-QSAR 6D-QSAR Topmer CoMFA Quasar Raptor

Epidemiology of lung cancer and approaches for its prediction:a systematic review and analysis

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Chinese Journal of Cancer 2016年第9期35卷 455-467页

作者： Ashutosh Kumar dubey Umesh Gupta Sonal Jain Institute of Engineering and Technology JK Lakshmipat UniversityNear

Background: Owing to the use of tobacco and the consumption of alcohol and adulterated food, worldwide cancer incidence is increasing at an alarming and frightening rate. Since the last decade of the twentieth century, lung cancer has been the most common cancer type. This study aimed to determine the global status of lung cancer and to evaluate the use of computational methods in the early detection of lung ***: We used lung cancer data from the United Kingdom(UK), the United States(US), India, and Egypt. For statistical analysis, we used incidence and mortality as well as survival rates to better understand the critical state of lung ***: In the UK and the US, we found a significant decrease in lung cancer mortalities in the period of 1990–2014, whereas, in India and Egypt, such a decrease was not much promising. Additionally, we observed that, in the UK and the US, the survival rates of women with lung cancer were higher than those of men. We observed that the data mining and evolutionary algorithms were efficient in lung cancer ***: Our findings provide an inclusive understanding of the incidences, mortalities, and survival rates of lung cancer in the UK, the US, India, and Egypt. The combined use of data mining and evolutionary algorithm can be efficient in lung cancer detection.

关键词：肺癌流行病学系统预测早期检测临界状态进化算法数据挖掘

近20年印度北阿坎德邦奈尼塔尔地区农业面积变化

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资源与生态学报:英文版 2023年第5期14卷 983-990页

作者： Saurabh PARGAIEN Rishi PRAKASH Ved Prakash dubey 格拉菲克时代电子与通信工程系德拉敦248002印度格拉菲克时代山地大学计算机科学与工程系德拉敦248002印度

本研究对印度北阿坎德邦奈尼塔尔地区的农业用地进行了时间序列分析。该研究基于Landsat5,Landsat7and Landsat8卫星图像数据,使用随机森林分类器对该区域近21年(2000–2021年)的农业和非农业土地进行分类。陆地卫星图像使用谷歌地球引... 详细信息

本研究对印度北阿坎德邦奈尼塔尔地区的农业用地进行了时间序列分析。该研究基于Landsat5,Landsat7and Landsat8卫星图像数据,使用随机森林分类器对该区域近21年(2000–2021年)的农业和非农业土地进行分类。陆地卫星图像使用谷歌地球引擎(GEE)平台进行处理,随机森林分类器的选择则是基于随机森林(RF)、支持向量机(SVM)和分类与回归树(CART)之间的比较分析。对总体准确度、用户准确度、生产者准确度和Kappa系数进行了评估,以确定研究区域的最佳分类器。结果表明,2021年RF、SVM和CART的总体准确率分别为96.38%、94.44%和91.94%;类似地,RF、SVM和CART的Kappa系数分别为0.96、0.89和0.81。陆地卫星在农业和非农业地区的分类图像显示,该区域在21年间(2000–2021年)农业用地减少了4.71%。该研究还表明,过去4年(即2018–2021年)该区域农业面积下降幅度最大。本研究对于发展中国家了解农用地变化并采取适当措施以保护该地区的动植物非常重要。

关键词：机器学习土地分类谷歌地球引擎

Broadcasting with Controlled Redundancy and Improved Localization in Wireless Sensor Networks

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Journal of Electronic Science and Technology 2013年第4期11卷 404-407页

作者： Tarun dubey Om Prakash Sahu the Department of Electronics and Communication Engineering National Institute of Technology

Wireless sensor networks （WSNs） consist of sensor nodes that broadcast a message within a network. Efficient broadcasting is a key requirement in sensor networks and has been a focal point of research over the last few years. There are many challenging tasks in the network, including redundancy control and sensor node localization that mainly depend on broadcasting. In this paper, we propose a broadcasting algorithm to control redundancy and improve localization （BACRIL） in WSNs. The proposed algorithm incorporates the benefits of the gossip protocol for optimizing message broadcasting within the network. Simulation results show a controlled level of redundancy, which is up to 57.6% if the number of sensor nodes deployed in a 500 m×500 m area are increased from 50 to 500.

关键词： Broadcast gossip localization nodedensity redundancy wireless sensor networks.