检索结果-南通市图书馆

Impacts of tourism development on the physical environment of Mussoorie,a hill station in the lower Himalayan range of India

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 Mountain Science 2018年第10期15卷 2276-2291页

作者： Sangeeta SUNDRIYAL Vijay SHRIDHAR Sandeep MADHWAL Kamal PANDEY vikram sharma School of Environment&Natural Resources Doon UniversityDehradun-248001UtturakhandIndia Indian Institute of Remote Sensing Dehradun-248001UttarakhandIndia

Tourism in mountainous regions is a significant source of revenue generation. However, it has also been associated with many adverse environmental consequences. This study aims at assessing the negative impacts of the incessant upsurge in tourism development on the physical environment of Mussoorie, a well-known mountain tourist destination in India. The impact indicators for the region were identified and assessed by qualitative and quantitative analysis of field observations. The observations indicated the aggravation of traffic congestion, atmospheric pollution, undisposed solid waste, water scarcity and infrastructure unavailability as the prevalent issues, especially during the peak tourist months. The extent of the consequential damage to the environment was evaluated by conducting an assessment of tourism-induced human disturbance on the natural landscape of the town. Slope, slope aspect, vegetation cover, road network and drainage network were incorporated as thedetermining landscape attributes to prepare thematic maps of landscape quality(perceivable intrinsic properties) and landscape fragility(vulnerability to anthropogenic disturbances) using GIS technique. An absorption capacity map was finally prepared to characterize the study area into regions of different conservation needs. The results identified the need for planning appropriate preservation strategies for different tourist places in the town. The study can be used by the policy makers for implementing the regulatory measures against potential disturbances due to mass-tourism.

关键词： Absorption capacity Analytical Hierarchy Process Geographic Information System Human interventions Landscape assessment Mountain Tourism Destination

Geological Observations from a Palaeolake Basin, Lamayuru, Ladakh, Northwestern Himalaya

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Open Journal of Geology 2021年第6期11卷 175-182页

作者： vikram sharma A. R. Chaudhri Department of Geology Kurukshetra University Kurukshetra India

A well known Buddhist monastery of Lamayuru is located in a village about 128 Km West of Leh. It is situated on more than 100 m thick Late Quaternary palaeolake deposits which are surrounded by rocks of Lamayuru Formation. Geologically, the Lamayuru Formation includes the Lamayuru and Namikala flysch deposits of Triassic-Jurassic age. This Formation is composed of shales, schist and phyllites. This Lamayuru Formation forms the base and source of palaeolake deposits. In Late-Pleistocene (35 ka B.P.) the Lamayuru River was dammed due to tectonically triggered landslide and the Lamayuru palaeolake came into existence. The sedimentation in the palaeolake basin commenced at 35 ka B.P. and culminated at 1 ka B.P. The deposits of palaeolake consist of carbonaceous mud, sand, silty clay and matrix supported breccia. The palaeolake deposits are a product of complex interplay of lacustrine, fluvio-deltaic to colluvial processes. The research study shows the prevalence of glacio-lacustrine conditions during the major part of depositional history as evidenced by the dominance of varves in these deposits.

关键词： Late-Quaternary Lamayuru Formation Palaeolake Deposits NW Himalaya

Active Tectonic Strike-Slip Fault Development near Goran, Samba and Kathua Districts, Jammu and Kashmir

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Geology 2020年第4期10卷 301-316页

作者： vikram sharma A. R. Chaudhri Department of Geology Kurukshetra University Kurukshetra India

Active tectonic morphometric studies of the sparsely investigated frontal Siwalik terrain around Goran in the Samba district bordering the Kathua district of J&K reveal the presence of NW-SE trending active sinistral strike-slip fault with oblique slip component which is parallel to the Surin-Masatgarh anticline. The Basantar River, the Tarnah stream, the Ujh River, the Sahaar stream and the Ravi River exhibit significant stream offsets where the fault crosses these channels. The values of the morphometric indices viz. stream sinuosity index (S), stream length gradient index (SL), valley floor width to valley height ratio (Vf), mountain front sinuosity index (Smf), hypsometric integral (Hi), basin asymmetry ratio (AF) and basin elongation ratio (Eb) calculated along the linear river offsets with respect to longitudinal River segments of the Rivers Basantar, Tarnah, Ujh, Sahaar and Ravi Rivers reveal that terrain is tectonically active and can be placed in tectonic active class I. The fault has an apparent offset of about 2000 m with it as it crosses the Basantar, the Tarnah, the Ujh, the Sahaar and the Ravi Rivers. The stream offsets upon field and laboratory investigations are developed due to an active sinistral strike slip fault which is being named as Goran fault. This fault has a surface expression of 100 km extending from the Basantar in the northwest up to the Beas River in the southwest whereas the remaining segment may exist as a hidden fault all along the Himalaya.

关键词： Active Tectonics Goran Fault Stream Offsets Himalaya

Effect of process parameter on the flowability of nanocrystalline CoNiCrAlY powder synthesized by mechanical milling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第9期92卷 210-223页

作者： Annadaa Shankara Dash Indranil Manna Deepa Devapal Sharad Chandra sharma Jyotsna Dutta Majumdar School of Nanoscience and Technology IIT KharagpurWest BengalIndia BIT Mesra RanchiJharkhandIndia Department of Metallurgical and Materials Engineering IIT KharagpurWest BengalIndia vikram Sarabhai Space Centre ThiruvanthapuramKeralaIndia

The present study concerns understanding the effect of process parameters on the characteristics and flowability of nanocrystalline CoNiCrAlY powder synthesized by mechanical *** milling has been conducted in a planetary ball mill with tungsten carbide(WC)ball,with ball to powder ratio of 10:1 at 300 rpm speed,using 1%stearic acid and toluene as process control agent(PCA)with time varying from 10 h to 36 *** synthesized nanocrystalline powder were characterized by Scanning Electron Microscopy,X-ray Diffraction technique,X-ray Photoelectron Spectroscopy,and Differential Scanning ***,flowability in terms of Hausner ratio was assessed by Tap Density *** particle size of the powder was found to decrease from 33μm to 22μm after 10 h of milling and further increases to 43μm and 38μm after 25 and 36 h of milling,respectively,in stearic acid ***,in toluene medium particle size continuously decreases from 33μm to 9.7μm with increasing milling *** particle morphology changes from spherical to platelet shape at low milling hours in both of the *** 25 h of milling,the shape of the particles is nearly spherical for stearic acid and irregular for toluene used as a *** size was found to decrease with increasing milling time from 147 nm to 7.7 nm and to 6.4 nm in stearic acid and toluene media,*** was presence ofγ,γʹ,β,hcp-Co,Al_(2)O_(3)and AlOOH phases on the powder particles milled in both the *** measured Hausner ratio of the powders was found to vary from 1.18 to 1.32 in stearic acid medium,and was found to increase with increasing milling *** the other hand,in toluene media flowability decreases(Hausner ratio increases from 1.33 to 1.44)with increasing milling time.

关键词： Mechanical milling Microstructure Process control agent(PCA) CoNiCrAIY Toluene Stearic acid Flowability

Rice straw management through biofuel,biochar,mushroom cultivation,and paper production to overcome environmental pollution in North India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Waste Disposal and Sustainable Energy 2023年第4期5卷 483-510页

作者： vikram Kumar Pooja Singh Jyoti sharma Sakshi Saini Priyanka sharma Asha sharma Department of Botany Maharshi Dayanand UniversityRohtakHaryana124001India

Rice is the prominent food grain required by more than half of the world's population to fulfill their nutritional *** the continuous growth in the population at the global level,rice production has also been ***,high rice production also creates a new problem in waste management *** straw,generated after rice harvest,possesses meager nutritional value,due to which it is less preferred as fodder and burned in the *** burning is one of the major causes of air pollution,leading to lung,heart,eye,and skin-related diseases and even premature *** stubble burning also decreases soil *** this review article,we have discussed the various economic uses of paddy straw which will help to reduce air pollution through the decline in paddy straw *** is produced from paddy straw,which can be mixed into the soil to restore fertility and reduce toxic metals'*** generation of biofuels such as biobutanol,bioethanol,and biogas from rice straw with their mechanism of synthesis is also discussed in this *** straw can also be utilized in the preparation of solid *** with this,mushroom cultivation in paddy straw houses is also *** straw can be used for the pulp and paper industries,which will help to reduce the tree dependence of these *** from this,a bibliometric analysis of the Scopus database on rice straw uses for the last 20 years was done,including a bibliographic keyword analysis to show published documents'*** review will give an elaborated overview of the alternative uses of rice straw with a quantitative analysis of air pollution caused by paddy straw *** review will also help to improve the current uses of paddy straw for industrial and commercial benefits to make it more economical.

关键词： Rice straw Environment pollution Biochar Biofuels Mushroom cultivation Paper and pulp

Peroxisome proliferator-activated receptor gamma as a therapeutic target for hepatocellular carcinoma:Experimental and clinical scenarios

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2022年第28期28卷 3535-3554页

作者： Swati Katoch Vinesh sharma vikram Patial Division of Dietetics and Nutrition Technology Institute of Himalayan Bioresource TechnologyPalampur 176061Himachal PradeshIndia Academy of Scientific and Innovative Research Ghaziabad 201002UPIndia

Hepatocellular carcinoma(HCC)is the most common type of liver cancer *** hepatitis is a significant risk factor for HCC,although metabolic syndrome and diabetes are more frequently associated with the *** increasing prevalence,there is expected to be>1 million cases annually by ***,there is an urgent need to establish potential therapeutic targets to cure this ***-proliferator-activated receptor gamma(PPARγ)is a ligand-activated transcription factor that plays a crucial role in the pathophysiology of *** synthetic agonists of PPARγsuppress HCC in experimental studies and clinical *** synthetic agonists have shown promising results by inducing cell cycle arrest and apoptosis in HCC cells and preventing the invasion and metastasis of ***,some synthetic agonists also pose severe side effects in addition to their therapeutic *** natural PPARγagonists can be an alternative to exploit this potential target for HCC *** this review,the regulatory role of PPARγin the pathogenesis of HCC is ***,the experimental and clinical scenario of both synthetic and natural PPARγagonists against HCC is *** of the available literature advocates PPARγas a potential therapeutic target for the treatment of HCC.

关键词： Anticancer Hepatocellular carcinoma Natural agonists Peroxisome proliferator-activated receptor-γ Thiazolidinediones

Kikuchi-Fujimoto disease:A comprehensive review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2023年第16期11卷 3664-3679页

作者： vikram K Mahajan Vikas sharma Neeraj sharma Ritu Rani Department of Dermatology Venereology and LeprosyDr.Radhakrishnan Government Medical CollegeHamirpur 177001Himachal PradeshIndia

Kikuchi-Fujimoto disease,a rare form of necrotizing lymphadenitis,is an uncommon,benign,self-limiting disorder of obscure *** affects mostly young adults of both ***,it presents with fever and lymphadenopathy of a firm to rubbery consistency frequently involving cervical lymph nodes while weight loss,splenomegaly,leucopenia,and elevated erythrocyte sedimentation rate feature in severely affected *** involvement occurs in about 30%-40%of cases as facial erythema and nonspecific erythematous papules,plaques,acneiform or morbilliform lesions of great histologic *** Kikuchi-Fujimoto disease and systemic lupus erythematosus share an obscure and complex relationship as systemic lupus erythematosus may occasionally precede,develop subsequently,or sometimes be associated concurrently with Kikuchi-Fujimoto *** is often mistaken for non-Hodgkin lymphoma while lupus lymphadenitis,cat-scratch disease,Sweet’s syndrome,Still’s disease,drug eruptions,infectious mononucleosis,and viral or tubercular lymphadenitis are other common *** needle aspiration cytology mostly has features of nonspecific reactive lymphadenitis and immunohistochemistry studies usually show variable features of uncertain diagnostic *** its diagnosis is exclusively from histopathology,it needs to be evaluated more carefully;an early lymph node biopsy will obviate the need for unnecessary investigations and therapeutic *** treatment with systemic corticosteroids,hydroxychloroquine,or antimicrobial agents mostly remains *** article reviews clinicoepidemiological,diagnostic,and management aspects of KFD from the perspective of practicing clinicians.

关键词： Cervical lymphadenopathy Histiocytic necrotizing lymphadenitis Kikuchi’s disease Lymphadenopathy Lymphoma Systemic lupus erythematosus

Patch testing and cross sensitivity study of adverse cutaneous drug reactions due to anticonvulsants: A preliminary report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Methodology 2017年第1期7卷 25-32页

作者： TN Shiny vikram K Mahajan Karaninder S Mehta Pushpinder S Chauhan Ritu Rawat Rajni sharma Department of Der-matology Venereology and LeprosyDr.R.P.Govt. Medical College

AIM To evaluate the utility of patch test and cross-sensitivity patterns in patients with adverse cutaneous drug reactions(ACDR) from common anticonvulsants. METHODS Twenty-four(M:F = 13:11) patients aged 18-75 years with ACDR from anticonvulsants were patch tested 3-27 mo after complete recovery using carbamazepine, phenytoin, phenobarbitone, lamotrigine, and sodium valproate in 10%, 20% and 30% conc. in pet. after informed consent. Positive reactions persisting on D3 and D4 were considered significant. RESULTS Clinical patterns were exanthematous drug rash with or without systemic involvement(DRESS) in 18(75%), Stevens-Johnsons syndrome/toxic epidermal necrolysis(SJS/TEN) overlap and TEN in 2(8.3%) patients each, SJS and lichenoid drug eruption in 1(4.2%) patient each, respectively. The implicated drugs were phenytoin in 14(58.3%), carbamazepine in 9(37.5%), phenobarbitone in 2(8.3%), and lamotrigine in 1(4.7%) patients,respectively. Twelve(50%) patients elicited positive reactions to implicated drugs; carbamazepine in 6(50%), phenytoin alone in 4(33.3%), phenobarbitone alone in 1(8.3%), and both phenytoin and phenobarbitone in 1(8.33%) patients, respectively. Cross-reactions occurred in 11(92%) patients. Six patients with carbamazepine positive patch test reaction showed cross sensitivity with phenobarbitone, sodium valproate and/or lamotrigine. Three(75%) patients among positive phenytoin patch test reactions had cross reactions with phenobarbitone, lamotrigine, and/or valproate. CONCLUSION Carbamazepine remains the commonest anticonvulsant causing ACDRs and cross-reactions with other anticonvulsants are possible. Drug patch testing appears useful in DRESS for drug imputability and cross-reactions established clinically.

关键词： Anticonvulsant hypersensitivity syndrome Carbamazepine Sodium valproate Drug rash with eosinophilia with or without systemic involvement Drug patch test Lamotrigine Phenobarbitone Phenytoin Stevens-Johnsons syndrome Toxic epidermal necrolysis

自由取向炭/炭复合材料的新型制备及工艺优化（英文）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

新型炭材料 2018年第5期33卷 424-433页

作者： Thakur Sudesh Kumar Raunija Rajeev K.Gautam Sharad Chandra sharma Anil Verma Carbon and Ceramics Laboratory Materials and Mechanical EntityVikram Sarabhai Space Centre Indian Space Research OrganisationThiruvananthapuram 695022KeralaIndia Sustainable Environergy Research Lab(SERL) Department of Chemical Engineering Indian Institute of Technology DelhiHauz-KhasNew Delhi 110016India Materials and Metallurgy Group Materials and Mechanical EntityVikram Sarabhai Space Centre Indian Space Research OrganisationThiruvananthapuram 695022KeralaIndia

采用在炭纤维束的内部浸润熔融沥青的传统方法制备得到的炭/炭(C/C)复合材料难以实现细旦化水平,这是因为单束丝中含有数千根丝,经浸渍后沥青附着,从而引起沥青局部渗出,以及因不均匀沥青稳定性而导致微观结构不均匀。本文通过稳定的中... 详细信息

采用在炭纤维束的内部浸润熔融沥青的传统方法制备得到的炭/炭(C/C)复合材料难以实现细旦化水平,这是因为单束丝中含有数千根丝,经浸渍后沥青附着,从而引起沥青局部渗出,以及因不均匀沥青稳定性而导致微观结构不均匀。本文通过稳定的中间相沥青和分散的短切炭纤维混合、热压和炭化过程制备出细旦化水平的C/C复合材料。探讨了工艺参数对中间相沥青残炭率的影响。通过残炭率/工艺时间、残炭率!(表观密度/实密度)来优化工艺参数。结果表明,通过此法得到了细旦化水平的中间相沥青与炭纤维复合材料。中间相沥青的残炭率随加热升温速率、沥青/炭纤维质量比的增加而降低;随热压压力而增加。在高压力和高质量比下,发生沥青局部渗出。通过调控得到最佳的C/C复合材料制备工艺参数为:热压压力15 MPa,升温速率0. 2℃/min及沥青/炭纤维质量比1∶1。

关键词：石油沥青中间相沥青短切炭纤维热压产率