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Species Composition and Diversity in Mid-altitudinal Moist Temperate Forests of the Western Himalaya
Gairola, Sumeet,Sharma, C.M.,Suyal, Sarvesh,Ghildiya, S.K. Institute of Forest Science 2011 Journal of Forest Science Vol.27 No.1
The present study was undertaken in middle altitudinal (1500 to 2500 masl) moist temperate forest of Mandal-Chopta area in the Garhwal region of Uttarakhand, India. The aim of the present study was to assess the variation in species composition and diversity in different vegetation layers viz. herb, shrub and tree, at different altitudes. Shannon-Wiener diversity index ($\bar{H}$), $Nha^{-1}$, total basal cover per hectare (G), Simpson concentration of dominance, Pielou Equitability, species richness (SR), Margalef index, Menheink index of species richness and ${\beta}$-diversity were calculated to understand community composition. Tree G ranged from 84.25 to 35.08 $m^2ha^{-1}$ and total stem density varied from 990 to 1470 Nha-1. Total SR (herb, shrub and trees) among different forest types ranged between 31 and 58. Maximum G of herb and shrub layers was recorded at lower altitudes between 1500 and 1650 masl. ${\beta}$-diversity was higher in herb layers as compared to tree and shrub layers. Dominance-diversity curves were also drawn to ascertain resource apportionment among various species in different forest types. Values of species diversity, $\bar{H}$, $Nha^{-1}$ and G were higher in the study area as compared to similar forests growing in other parts of Uttarakhand Himalaya.
Species Composition and Diversity in Mid-altitudinal Moist Temperate Forests of the Western Himalaya
Sumeet Gairola,C.M. Sharma,Sarvesh Suyal,S.K. Ghildiyal 강원대학교 산림과학연구소 2011 Journal of Forest Science Vol.27 No.1
The present study was undertaken in middle altitudinal (1500 to 2500 masl) moist temperate forest of Mandal-Chopta area in the Garhwal region of Uttarakhand, India. The aim of the present study was to assess the variation in species composition and diversity in different vegetation layers viz. herb, shrub and tree, at different altitudes. Shannon-Wiener diversity index ( H ), Nha-1, total basal cover per hectare (G), Simpson concentration of dominance, Pielou Equitability, species richness (SR), Margalef index, Menheink index of species richness and β-diversity were calculated to understand community composition. Tree G ranged from 84.25 to 35.08 m2ha-1 and total stem density varied from 990 to 1470 Nha-1. Total SR (herb, shrub and trees) among different forest types ranged between 31 and 58. Maximum G of herb and shrub layers was recorded at lower altitudes between 1500 and 1650 masl. β-diversity was higher in herb layers as compared to tree and shrub layers. Dominance-diversity curves were also drawn to ascertain resource apportionment among various species in different forest types. Values of species diversity, H, Nha-1 and G were higher in the study area as compared to similar forests growing in other parts of Uttarakhand Himalaya.
Sumeet Gairola,Chandra M. Sharma,Sunil K. Ghildiyal,Sarvesh Suyal 한국산림과학회 2011 Forest Science And Technology Vol.7 No.3
The study was conducted along an altitudinal gradient (1500 to 2850 m above sea level) in moist tropical montane valley slopes of the Mandal-Chopta area in the Garhwal region of India. Twelve forest types according to the altitude, slope aspect, and species compositions were selected for the study. The aims of the study were to describe and examine the structure and composition of the tree vegetation along an altitudinal gradient, and to compare the results of the present study with the other forests of Uttarakhand Himalaya growing at similar altitudinal range. High values of stem density and species diversity were recorded in mixed broad-leaved forest types growing between 1600 and 2400 m a.s.l., whereas forest types growing at higher altitudes (42400 m a.s.l.) had low species richness and stem density. Tree density (tree ha71) showed positive relationship with species richness and Shannon–Wiener diversity index. Forest types growing at higher altitude (42400 m a.s.l.) showed geometric dominance-diversity curves. The values of stem density and total basal area in most of the forest types were higher than the earlier reported values from other parts of the Uttarakhand Himalaya.
Pulse Multiplication in Autotransformer Based AC-DC Converters using a Zigzag Connection
Sanjay Gairola,Bhim Singh 전력전자학회 2007 JOURNAL OF POWER ELECTRONICS Vol.7 No.3
This paper deals with pulse multiplication in zigzag connected autotransformer based 12-pulse AC-DC converters feeding vector controlled induction motor drives (VCIMD) for improving the power quality at the point of common coupling (PCC) without using a Zero-Sequence-Blocking-Transformer (ZSBT). The proposed 24-pulse AC-DC converter is based on the principle of DC ripple re-injection technique for pulse multiplication and harmonic mitigation. The design of the autotransformer is carried out for the proposed AC-DC converter and the effect of load variation on VCIMD is also studied to demonstrate the effectiveness of the proposed AC-DC converter. Test results from a laboratory developed prototype, along with simulated results, are presented to validate the design and model of the proposed 24-pulse AC-DC converter.
Pradeep Sambyal,S.K. Dhawan,Preeti Gairola,Sampat Singh Chauhan,S.P. Gairola 한국물리학회 2018 Current Applied Physics Vol.18 No.5
Present study focus on the designing of high performance microwave absorbing material against electromagnetic pollution. Herein we synthesize conducting polymer based composite encapsulated with Barium strontium titanate (BST), reduced graphene oxide (RGO), and Fe3O4 nanoparticles via chemical oxidative polymerization of pyrrole. The synthesized composite materials were thoroughly characterized using SEM, FTIR, XRD, TGA, and VSM techniques. The presence of filler materials in conducting polymer matrix leads to absorption dominated shielding effectiveness value of 48 dB in the frequency range of 8.2–12.4 GHz (X-band). Moreover, presence of dielectric and magnetic fillers increases the thermal and chemical stability of the composite material. The obtained shielding effectiveness value is above the recommended limit (30–40 dB) required for the commercial applications, therefore these composite material could be used as effective shield against EM pollution.
An 18-Pulse Full-Wave AC-DC Converter for Power Quality Improvement
Singh, Bhim,Gairola, Sanjay The Korean Institute of Power Electronics 2008 JOURNAL OF POWER ELECTRONICS Vol.8 No.2
In this paper, a novel delta/double-fork transformer based 18-pulse full-wave AC-DC converter is designed, modeled, simulated and developed to feed isolated DC varying loads. The proposed AC-DC converter is used for low voltage and large current DC loads in applications such as electrowinning, where isolation is required mainly for stepping down the supply voltage. The proposed converter improves power quality at AC mains and meets IEEE-519 standard requirements at varying loads.
Tandon, Sarthak,Gairola, Munish,Ahlawat, Parveen,Sharma, Kanika,Barik, Soumitra,Sachdeva, Nishtha,Pasricha, Sunil,Shenoy, Apeksha The Korean Society for Radiation Oncology 2018 Radiation Oncology Journal Vol.36 No.4
Surgical excision along with use of postoperative radiotherapy forms an integral management of sinonasal teratocarcinosarcoma (SNTCS). However, given the rarity of the tumor, no standardised guidelines, dose, technique and target delineation exist especially in the era of modern radiation delivery techniques. This is a case of 55-year-old male diagnosed as SNTCS treated with radical ethmoidectomy followed by volumetric modulated radiotherapy, showing good local control and acceptable toxicity profile.
A Zigzag Connected Auto-Transformer Based 24-Pulse AC-DC Converter
Singh, Bhim,Gairola, Sanjay The Korean Institute of Electrical Engineers 2008 Journal of Electrical Engineering & Technology Vol.3 No.2
In this paper, a 24-pulse AC-DC converter is designed, modeled, simulated, and developed to feed non-isolated varying loads. The proposed AC-DC converter configuration consists of an auto-transformer based on zigzag connection to overcome current harmonic problems in AC mains. It improves power quality at AC mains and it meets IEEE-519 standard requirements at varying loads. A set of power quality indices on input AC mains and on DC buses for a load fed from 6-pulse and 12-pulse AC-DC converters is also given to compare their performance. It is observed that input current total harmonic distortion(THD) of less than 8% is possible with the proposed topology of AC-DC converter at varying loads.
Pulse Multiplication in Autotransformer Based AC-DC Converters using a Zigzag Connection
Singh, Bhim,Gairola, Sanjay The Korean Institute of Power Electronics 2007 JOURNAL OF POWER ELECTRONICS Vol.7 No.3
This paper deals with pulse multiplication in zigzag connected autotransformer based 12-pulse AC-DC converters feeding vector controlled induction motor drives (VCIMD) for improving the power quality at the point of common coupling (PCC) without using a Zero-Sequence-Blocking-Transformer (ZSBT). The proposed 24-pulse AC-DC converter is based on the principle of DC ripple re-injection technique for pulse multiplication and harmonic mitigation. The design of the autotransformer is carried out for the proposed AC-DC converter and the effect of load variation on VCIMD is also studied to demonstrate the effectiveness of the proposed AC-DC converter. Test results from a laboratory developed prototype, along with simulated results, are presented to validate the design and model of the proposed 24-pulse AC-DC converter.
COMMON FIXED POINT FOR GENERALIZED MULTIVALUED MAPPINGS VIA SIMULATION FUNCTION IN METRIC SPACES
Antal, Swati,Gairola, U.C. Korean Mathematical Society 2020 대한수학회논문집 Vol.35 No.4
The purpose of this paper is to introduce the notion of generalized multivalued Ƶ-contraction and generalized multivalued Suzuki type Ƶ-contraction for pair of mappings and establish common fixed point theorems for such mappings in complete metric spaces. Results obtained in this paper extend and generalize some well known fixed point results of the literature. We deduce some corollaries from our main result and provide examples in support of our results.