检索结果-南通市图书馆

Journal of Forestry Research 2013年第4期24卷 715-720页

作者： Gitamani Dutta ashalata devi Department of Environmental Science Tezpur University

We investigated the plant population structure and the phy- tosociological and regeneration status in two disturbed tropical forests in Assam Province, the Hojai Reserve Forest and Kumorakata Reserve Forest. A total of 166 species （80 trees, 20 shrubs and 66 herbs） of 136 genera and 63 families were recorded in both study sites. The disturbance index at the two sites, Kumorakata Reserve Forest and Hojai Reserve Forest, were recorded at 11.4% and 3.70% respectively. Reverse J-shaped population curve and exploitation of tree species in higher girth classes were recorded at both study sites. In the girth classes （10-30 cm, 30-60 cm, 60-90 cm and 90-120 cm in size） the percentage of cut stump density was higher than the percentage of individual living trees. The 18% （Kumorakata Reserve Forest） and 7% （Hojai Reserve Forest） spe- cies were recorded as not regenerating. Illegal felling and over-exploitation of forest resources may lead to species-specific changes in the population structure and can alter the future structure and composi- tion of the forests.

关键词： plant diversity regeneration disturbance population struc-ture Assam India

An application of blended amendments in monsoon rice field

在线全文

学校读者我要写书评

暂无评论

Ecological Processes 2017年第1期6卷 373-380页

作者： Madhumita Ghosh ashalata devi Department of Environmental Science Tezpur UniversityP.O-784028 NapaamIndia

Introduction:Rice is the main food crop of the world,and the cultivation of rice crop during the monsoon season is hard due to the rain-induced *** from this,farmers in north-eastern regions of India often implement improper crop management leading to poor ***,the development of suitable management practices under improved varieties of rice become essential for increasing rice productivity,improving soil quality status and reducing methane ***:The aim of the study was to investigate the variation in soil properties,crop growth and methane emission under the application of an inorganic fertiliser as well as its mixtures with both inorganic and plant *** such an attempt,a field-based experiment was conducted with the rice variety Chandrama during 2015 in slightly acidic soil having sandy loam *** amendments,*** and NPK,blended separately with magnesium sulphate,fresh neem(Azadirechta indica)leaves,used tea(Camellia sinensis ***)leaves,and fresh karanj(Pongamia glabra)leaves were used for the study with four replications ***:Application of NPK separately with the leaves of neem,tea and karanj separately at the onset of monsoon season markedly affected the soil porosity and the water-holding capacity of the ***,in comparison with sole NPK fertilisation,a significance increase in soil organic matter accumulation(2.48±0.10%)was seen only for karanjblended NPK while magnesium sulphate-blended NPK showed the lowest methane emission(0.30±0.01 mg/m2/h).The rice plants grown on karanj-blended NPK soil showed the highest yield(0.560±0.01 kg/m2)among the five ***:It was found that only the karanj leaves blended NPK could significantly improve the soil organic matter and increase rice yield without intensifying methane emission,while magnesium sulphate blended with NPK could significantly reduce methane emission in the flooded rice paddy soil at 0.5 t/ha application level but

关键词： Inorganic fertiliser Leaves of plants Soil properties Rice yield Methane emission

A new Bergeria(Flemingitaceae) from the Mississippian of Xinjiang,NW China and its evolutionary implications

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2019年第1期8卷 89-98页

作者： Ru Feng ashalata D’Rozario Jian-Wei Zhang School of Urban and Environment Science Huaiying Normal University Xinjiang Institute of Ecology and Geography Chinese Academy of Science Department of Botany Narasinha Dutt College

A new Bergeria(Lepidodendrales, Flemingitaceae), B. wenquanensis sp. nov., is described in this paper, typically characterized by the longest and elongated leaf cushions ever found. The specimen, collected from the Mississippian of Wenquan County, Xinjiang Uygur Autonomous Region, China, is represented by a fossil stem about two meters long, with distinct leaf cushions. The genus Bergeria has usually been assigned to partially decorticated Lepidodendron stems. Although Cathaysian Lepidodendron have been extensively reported in China, most of them were found in the central, eastern and southern parts of the country, rarely in northwestern China. This new species is so far the westernmost record and the most isolated representative from the Cathaysian Lepidodendron *** on the distribution of the Cathaysian Lepidodendron during the Mississippian, most of the species were in the South China Plate near the Equator, while the new species is discrete in the north, far from the Equator. According to the spatiotemporal distribution of Cathaysian Lepidodendron, this genus appeared during the Mississippian, a period which was represented by rather few species, it flourished and expanded northwards during the Pennsylvanian, taking the north block of the South China Plate as the center. Since the Cisuralian to the Guadalupian, the genus became gradually sparser in all areas of distribution, probably due to strong climate change. During the Lopingian, the genus migrated southwards to the South China block and had a broader distribution range again, and it became extinct to the end of this interval. The new species is also significant for the evolution of Lepidodendron leaf cushions. During the Mississippian, the primitive species of Lepidodendron usually had narrow, fusiform leaf cushions, while the Pennsylvanian or Permian species were more variable in shape of leaf cushions, from inverted water-drop, rhomboidal, hexagonal, trapeziform to horizontal rhomboidal.

关键词： Cathaysian flora Bergeria Lepidodendron Mississippian Xinjiang

A New Species of the Extinct Genus Schizolepis from the Jurassic Daohugou Flora,Inner Mongolia,China with Special Reference to the Fossil Diversity and Evolutionary Implications

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2011年第2期85卷 471-481页

作者： ZHANG Jianwei ashalata D＇ROZARIO YAO Jianxin WU Zhenjie WANG Lijun Institute of Geology Chinese Academy of Geological Science Beijing 100037 China Department of Botany Narasinha Dutt College 129 Bellilious Road Howrah 711 101 India College of Ethnology and Sociology South Central University for Nationalities Wuhan 430074 Hubei China

Schizolepis daohugouensis sp. nov. is described from the Jurassic sediments of Daohugou flora, from Ningcheng County, Inner Mongolia Autonomous Region, China. The female cone is slender, cylindrical in shape, seed scale complexes are loosely and helically arranged on the cone axis at intervals of 3-5 mm. The seed scales are bilobed and divided almost from the base; the scales have no evident petiole but an articulation at the region of attachment to the cone axis. Each lobe of the seed scales is oval in shape, widest at the lower middle part; lobes are obtusely pointed with entire margins. Bract scale is fan shaped. Based on the records of Schizolepis, this is the first report of the occurrence of female cone of Schizolepis with the seed scales, the winged seeds and vegetative branches preserved together in the Jurassic deposits. The new discovery provides evidence that confirms the phylogenetic position of Schizolepis to the extant Pinaceae.

关键词： Daohugou Jurassic Pinaceae Schizolepis China

Plant Remains from an Archaeological Site as Indicators of Vegetation and Agricultural Practice Between(3 320±400) and(2 080±80) yr BP in Gangetic West Bengal,India

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2006年第6期48卷 628-641页

作者： Ruby Ghosh Subir Bera ashalata D'Rozario Manju Banerjee Supriyo Chakraborty Department of Botany University of Calcutta 35 Ballygunge Circular RoadKolkata 700019India Narasinha Dutt College 129 Bellilious Road Howrah 711101India Radiocarbon Dating Laboratory Birbal Sahni Institute of Palaeobotany 53 University RoadLucknow 226007India

Diverse plant remains recovered from an archaeological site of Chslcollthlc-Early Historic age in the Bhalrabdanga area of Pakhanna （latitude 23°25′N, longitude 87°23′E）, situated on the west bank of the Damodar river, Bankura district, West Bengal, India, include food grains, wood charcoals, and palynomorphs. Radiocarbon dating of the recovered biological remains reveal the age of the site as （3 320 ± 400） to （2 080± 80） yr BP. The food grains were Identified as Oryza sativa L. and Vigna mungo L, and seeds of Brassica cf. campestris L. were also found; these indicate the agricultural practice and food habits of the ancient people living at Pakhanna from the Chalcolithlc to the Early Historic period. Sediments Including plant remains have been broadly divided into two zones, considering archaeological findings and radiocarbon dating. Analysis of the plant remains （I.e, wood charcoals and palynomorphs） in addition to cultivated food grains has revealed that a rich vegetation cover existed in this area, with a prevailing tropical and humid climate, comprising the timber-yielding plants Shores sp., Terminalia sp., and Tamarindus sp., with undergrowths of diverse shrubs and herbs during the Chalcolithic period （zone I） dated （3 320 ± 400） yr BP. Comparatively poorer representation and frequency of plant remains Indicate a drier climate during the Early Historic period （zone Ⅱ） dated as （2 110 ± 340） to （2 080 ± 80） yr BP. Comparisons of the archaeobotanical data recovered from the Chalcollthic and Early Historic period and also a principle components analysis Indicate a change In the climate of the area from tropical and humid at （3 320 ± 400） yr BP to tropical and drier conditions at （2 110 ± 340） to （2 080 ± 80） yr BP. The present-day tropical, dry deciduous vegetation of the area suggests that climate change has occurred in the area since the contemporaneous past. The plant remains database has been utilized to reconstruct the settlement pattern of the community livi

关键词： agriculture archaeological site culture, India Pakhanna, plant remains vegetation West Bengal.

Deep insights into the advancements and applications of perovskite based photovoltaic cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2018年第3期27卷 753-763页

作者： Chandni devi Rajesh Mehra Electronics and Communication Department NITTTR

The organometal halide perovskite materials have a blend of surprising optoelectronic properties, for example high value of absorption coefficient and abrupt optical retention edge, lifetime, long charge carrier diffusion length and many more. Brought in conjunction with the capacity for manufacturing at low temperature, likewise from the solution, devices based on perovskite, particularly solar cells have been contemplated seriously with striking advancements in performance, in the course of recent years. The amalgamation of minimal effort, high efficiency and extra applications gives incredible potential to commercialization of these cells. The applications and performance of perovskite cells frequently relate with the structures of the device. Numerous creative structures of the devices were produced, targeting for vast scale manufacture, diminishing creation cost, upgrading the PCE and subsequently expanding the prospective for future applications. This paper outlines the various advanced structures of PSC, challenges confronted by these PSCs and their future perspectives. The commercial applications of PSC are additionally talked about in this paper.

关键词： Solar cells Flexibility ETM Perovskite HTM Structures

NONCONSTANT PREY HARVESTING IN RATIO-DEPENDENT PREDATOR-PREY SYSTEM INCORPORATING A CONSTANT PREY REFUGE

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2012年第2期5卷 85-104页

作者： SAPNA devi DST Centre for Interdisciplinary Mathematical Sciences Banaras Hindu University Varanasi-221005 India

This paper deals with the problem of nonconstant harvesting of prey in a ratio-dependent predator-prey system incorporating a constant prey refuge. Here we use the reasonable catch-rate function instead of usual catch-per-unit-effort hypothesis. The existence, as well as the stability of possible equilibria, is carried out. Bionomic equilibrium of the system is determined and optimal harvest policy is studied with the help of Pontryagin＇s maximum principle. The key results developed in this paper are illustrated using numer- ical simulations. Our results indicate that dynamic behavior of the system very much depends on the prey refuge parameter and increasing amount of refuge could increase prey density and may lead to the extinction of predator population density.

关键词： Predator-prey prey refuge taxation ratio-dependent stability bionomic equilibrium harvesting optimal equilibrium.

An Optimized Transfer Learning Model Based Kidney Stone Classification

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2023年第2期44卷 1387-1395页

作者： S.devi Mahalakshmi Department of Computer Science and Engineering Mepco Schlenk Engineering CollegeSivakasi626005TamilnaduIndia

The kidney is an important organ of humans to purify the *** healthy function of the kidney is always essential to balance the salt,potassium and pH levels in the ***,the failure of kidneys happens easily to human beings due to their lifestyle,eating habits and diabetes *** pre-diction of kidney stones is compulsory for timely *** processing-based diagnosis approaches provide a greater success rate than other detection *** this work,proposed a kidney stone classiﬁcation method based on optimized Transfer Learning(TL).The Deep Convolutional Neural Network(DCNN)models of DenseNet169,MobileNetv2 and GoogleNet applied for clas-siﬁ*** combined classiﬁcation results are processed by ensemble learning to increase classiﬁcation *** hyperparameters of the DCNN model are adjusted by the metaheuristic algorithm of Gorilla Troops Optimizer(GTO).The proposed TL model outperforms in terms of all the parameters compared to other DCNN models.

关键词： DCNN GTO kidney stone transfer learning

One step synthesis and characterization of copper doped sulfated titania and its enhanced photocatalytic activity in visible light by degradation of methyl orange

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第4期24卷 475-483页

作者： Radha devi Chekuri Siva Rao Tirukkovalluri Department of Inorganic and Analytical Chemistry School of Chemistry Andhra University Visakhapatnam India

This paper reports on the synthesis of copper doped sulfated titania nano-crystalline powders with varying （2.0%-10.0%, by mass） by single step sol gel method. The synthesized photo catalyst has been characterized by employing various techniques like X-ray Diffraction （XRD）, Ultraviolet-Visible Diffuse Reflection Spectroscopy （UV-Vis DRS）, X-ray Photoelectron Spectroscopy （XPS）, Scanning Electron Microscopy （SEM）, Energy Dispersive Spectrometry （EDS）, Fourier Transform Infrared Spectroscopic Studies （FT-IR）, and Transmission Electron Microscopy （TEM）. From the XRD and TEM results, all the samples were reported in anatase phase with reduction in particle size in the range of 7 to 12 nm. SEM indicated the change in morphology of the particles. The presence of copper in titania lattice was evidenced by XPS. From UV-Vis DRS and FT-IR studies indicated that prominent absorption shift is observed towards visible region （red shift）, the entry ofCu2 ＋ into Ti02 lattice as a substitution- al dopant and S042- ions were covalently bonded with Ti4＋ on the surface of the copper doped titania respectively. The photocatalytic activity studies were investigated by considering methyl orange （MO） as dye pollutant in the presence of the visible light. The effect of various parameters like effect of dosage of the catalyst, dopant concentration, pH of the solution, and concentration of the dye was studied in detail.

关键词： Copper doped sulfated TiO2 Sol-gel methodPhotocatalysisMethyl orange

Maintenance of gut microbiome stability for optimum intestinal health in pigs——a review

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2023年第3期14卷 853-863页

作者： Santi devi Upadhaya In Ho Kim Department of Animal Resource and Science Dankook UniversityNo.29 AnseodongCheonan31116ChoongnamSouth Korea

Pigs are exposed to various challenges such as weaning,environmental stressors,unhealthy diet,diseases and infections during their lifetime which adversely affects the gut *** inability of the pig microbiome to return to the pre-challenge baseline may lead to dysbiosis resulting in the outbreak of ***,the maintenance of gut microbiome diversity,robustness and stability has been influential for optimum intestinal health after *** human and animal researches have focused on more holistic approaches to obtain a robust gut microbiota that provides protection against pathogens and improves the digestive physiology and the immune *** this review,we present an overview of the swine gut microbiota,factors affecting the gut microbiome and the importance of microbial stability in promoting optimal intestinal ***,we discussed the current understanding of nutritional interventions using fibers and pre/probiotics supplementation as non-antibiotic alternatives to maintain microbiota resilience to replace diminished species.

关键词： Microbial diversity Nutritional intervention Perturbation Resilience Swine gut microbiome stability