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Extraction of Soil Boron for Predicting Its Availability to Plants

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Pedosphere 1991年第2期1卷 137-144页

作者： LIREN－AN u.c.gupta DepartmentofSoilScience ZhejiangAgriculturalUniversityHangzhou310029（China） ResearchBranch ResearchS

Field and greenhouse studies were conducted in Prince Edward Island (P. E.I.) on soybean (Glycine max (L.) Merr.), red clover (Trifolium *** L.), alfalfa (Medieagn saliva L.), and rutabaga (Brassica napobrassica. Mill). Plant B concentrations were compared to soil B extracted by hot-water, 0.05 M HcI, 1.5 M cH3cOOH and 0.01 M cacl2. The r values for extractable soil B vs. plant B were: hot water (0.67). 0.05 M Hcl (0.82), 1.5 M cH3cOOH (0.78) and hot 0.01 M cacl2(0.61). Results of soil B from the 0.05 M Hcl extracts were generally found to give the best correlation and linear regression among the four extractants tested for predicting the availability of B to the plants. Overall, the 0.05 M Hcl proved to be superior to hot water extraction and is recommended for predicting the available B status of the acid soils of P. E. I. The probability of error with 0.05 M HcL is less since it is shaken for a fixed period of time as opposed to subjective error which could be caused in monitoring the boiling time using hot water.

关键词： extraction 0.05 M HcI soil boron

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硼的中毒和缺乏

土壤学进展 1988年第1期 14-21+33页

作者： u.c.gupta 马文奇郑伟

本文讨论了影响植物硼中毒和缺乏的土壤与环境因素。着重讨论了硼中毒的影响因素。其主要内容涉及到硼的来源,硼对植物的重要性,植物缺硼及硼中毒的标准;土壤对硼的吸附及其影响硼吸附量的因素;土壤吸附性硼的解吸作用。阐述了灌溉水引... 详细信息

本文讨论了影响植物硼中毒和缺乏的土壤与环境因素。着重讨论了硼中毒的影响因素。其主要内容涉及到硼的来源,硼对植物的重要性,植物缺硼及硼中毒的标准;土壤对硼的吸附及其影响硼吸附量的因素;土壤吸附性硼的解吸作用。阐述了灌溉水引起土壤中硼的累积而产生的植物硼中毒,灌溉条件下土壤溶液达到硼平衡所需的时间,以及高硼土壤解毒的方法。还讨论了硼与其它元素间的相互关系;降雨量、温度、光强等环境因子对硼有效性的影响;在制订缺硼及硼中毒临界值上遇到的困难及其土壤有效硼表示方法上的混乱.此外还提出了尚需进一步研究的问题。

关键词：土壤溶液硼中毒硼浓度砂培试验植物生长植物吸收粘土矿物粘粒矿物硅酸盐矿物缺硼土壤吸附性作物产量

Instability of binary nanofluids with magnetic field

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Applied Mathematics and Mechanics(English Edition) 2015年第6期36卷 693-706页

作者： u.gupta J.SHARMA V.SHARMA Dr.S.S.Bhatnagar university Institute of chemical Engineering and Technology Panjab University Energy Research centre Panjab University Department of Mathematics Himachal Pradesh University

The present paper investigates the effects of a vertical magnetic field on the double diffusive nanofluid convection, The effects of the Brownian motion and ther- mophoresis due to the presence of nanoparticles and the effects of the Dufour and Sorer parameters due to the presence of solute are included in the investigated model. The normal mode technique is used to solve the conservation equations. For the analytical study, valid approximations are made in the complex expression for the Rayleigh number to get useful and interesting results. The bottom heavy binary nanofluids are more stable than the regular binary fluids, while the top heavy binary nanofluids are less stable than the regular binary fluids. The critical wave number and the critical Rayleigh number in- crease whereas the frequency of oscillation （for the bottom heavy configuration） decreases when the chandrasekhar number increases. The numerical results for the alumina-water nanofiuid are studied by use of the MATHEMATIcA software.

关键词： natural convection binary nanofluid Brownian motion thermophoresis,chandrasekhar number

Duration distributions for different softness groups of gamma-ray bursts

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Science china(Physics,Mechanics & Astronomy) 2010年第7期53卷 1375-1382页

作者： gupta A.c. Aryabhatta Research Institute of Observational Sciences(ARIES) Manora PeakNainital-263129India

Gamma-ray bursts(GRBs) are divided into two classes according to their *** investigate if the softness of bursts plays a role in the conventional classification of the *** employ the BATSE(Burst and Transient Source Experiment) catalog and analyze the duration distributions of different groups of GRBs associated with distinct *** analysis reveals that the conventional classification of GRBs with the duration of bursts is influenced by the softness of the *** exists a bimodality in the duration distribution of GRBs for each group of bursts and the time position of the dip in the bimodality histogram shifts with the softness *** findings suggest that the conventional classification scheme should be modified by separating the two well-known populations in different softness groups,which would be more reasonable than doing so with a single *** to the relation between the dip position and the softness parameter,we get an empirical function that can roughly set apart the short-hard and long-soft bursts:SP =(0.100 ± 0.028) T-(0.85 0.18) 90,± where SP is the softness parameter adopted in this paper.

关键词： gamma-rays bursts:methods data analysis:methods statistical

Guinea pig model of tuberculosis

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Asian Pacific Journal of Tropical Medicine 2009年第2期2卷 76-80页

作者： Pushpa gupta u.D.gupta Experimental Animal Facility National JALMA Institute for Leprosy & Other Mycobacterial DiseasesTajganjAgra 282001India

Animal models are being developed for testing different vaccine candidates as well as testing of new antitubercular since a long ***,guinea pigs and rabbits are animals which are frequently *** each model has got its merits as well as demerits and each of them differ from human tuberculosis in one aspect or the other but none of the model completely mimics the human *** of the different animal species, guinea pig model is one of the better models as it is very sensitive to *** infection but it has certain limitations like paucity of immunological ***,it is the best model for tuberculosis research.

关键词： Vaccines Animal Models Tuberculosis Guinea pig

Semi-solid near-net shape rheocasting of heat treatable wrought aluminum alloys

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Transactions of Nonferrous Metals Society of china 2010年第9期20卷 1719-1724页

作者： u.A.c uRLE Materials Science and Manufacturing Council for Scientific and Industrial Research

Flexibility of the cSIR-RcS, induction stirring with simultaneous air cooling process, in combination with high pressure die casting is successfully demonstrated by semi-solid rheocasting of plates performed on commercial 2024, 6082 and 7075 wrought aluminum alloys. Tensile properties were measured for the above mentioned rheocast wrought aluminum alloys in the T6 condition. The results showed that tensile properties were close to or even in some cases exceeded the minimum specifications. The yield strength and elongation of rheocast 2024-T6 exceeded the minimum requirements of the wrought alloy in the T6 condition but the ultimate tensile strength achieved only 90% of the specification because the Mg content of the starting alloy was below the commercial alloy specification. The strengths of rheocast 6082-T6 exceeded all of the wrought alloy T6 strength targets but the elongation only managed 36% of the required minimum due to porosity, caused by incipient melting during solution heat treatment, and the presence of fine intermetallie needles in the eutectic. The yield strength of rheocast 7075 exceeded the required one and the ultimate tensile strength also managed 97% of the specification; while the elongation only reached 46% of the minimum requirement also due to incipient melting porosity caused during the solution heat treatment process.

关键词： high pressure die casting (HPDc) aluminum alloys as-cast condition T6 treatment incipient melting

Seismic wave velocities of rare gas solids through elastic properties in Earth's lower mantle

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Science china Earth Sciences 2009年第10期52卷 1599-1611页

作者： Seema gupta Suresh c. GOYAL Department of Physics Agra College Faculty of Engineering and Technology Raja Balwant Singh College

The expressions for second (SOE) and third order elastic (TOE) constants for rare gas solids are derived for comparative study of elastic behavior within the framework of many body potentials including the effect of p... 详细信息

关键词： elastic properties seismic wave velocities RGS

Spatio-temporal variability in microfossil and geochemical records of cenomanian-Turonian oceanic anoxic event-2:a review

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Journal of Palaeogeography 2024年第4期13卷 646-674页

作者： c.P.Sooraj Shweta gupta Jahnavi Punekar Department of Earth Sciences Indian Institute of Technology BombayPowaiMumbai 400076India

The cenomanian-Turonian boundary oceanic anoxic event(OAE-2;Bonarelli event;~94 Ma)is associated with a species turnover in the marine calcareous microfossil record,widespread marine anoxia,black shale deposition and positiveδ13c *** study reviews 141 cTBE sites globally,aiming to understand micropaleontological,geochemical,and sedimentological expressions of *** is a clear palaeogeographic and palaeobathymetric heterogeneity in the development of OAE-2 marine anoxia.A majority of the documented OAE-2 sites are from deep marine *** calcareous nannoplankton and benthic foraminifera record a diversity decline,while planktic foraminifera shows community level shifts and no major mass *** variability of total organic carbon in OAE-2 sediments across sites(10 wt.%)and theδ13c profiles(diachronous)have been attributed to different mechanisms of anoxia *** increased primary“productivity model”gains support from productivity proxies(e.g.,Ba,P,cu,Ni),redox-sensitive elements(e.g.,Mn,Mo,u,V,As),and eutrophic genera(e.g.,benthic foraminifera Gabonita spp.,calcareous nannofossils Biscutum *** Zeugrhabdotus erectus).The enhanced organic carbon“preservation model”in stratified(semi)restricted basins gains support from sites with lower enrichment of redox-sensitive elements and oligotrophic flora and fauna in the OAE-2 *** of the caribbean and the High Atlantic Large Igneous Province events(cLIP and HALIP)mark them as likely triggers of the OAE-2 related global perturbation of marine *** triggers may have caused climate warming,altered hydrological cycles,enhanced continental weathering,shifts in ocean circulation,and nutrient *** knowledge gaps,further research is urged,utilizing innovative proxies,and exploring underrepresented depositional systems to comprehensively understand OAE-2 onset and biotic crisis.

关键词： Oceanic anoxic Event-2 Global organic carbon distribution Geochemical proxies Marine calcifiers Palaeoceanography

Photocatalytic reduction of organic pollutant under visible light by green route synthesized gold nanoparticles

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Journal of Environmental Sciences 2017年第5期29卷 236-246页

作者： Bharat c.choudhary Debajyoti Paul Tarun gupta Sandesh R.Tetgure Vaman J.Garole Amulrao u.Borse Dipak J.Garole School of chemical Sciences North Maharashtra University Jalgaon 425001 Maharashtra India centre for Environmental Science & Engineering Indian Institute of Technology Kanpur Kanpur 208016 Uttar Pradesh India Department of Earth Sciences Indian Institute of Technology Kanpur Kanpur 208016 Uttar Pradesh India Enoironmental Enoineering and Manaoement Department of Civil Engineering Indian Institute of Technology Kanpur Kanpur 208016 Uttar Pradesh India Directorate of Geology and Mining Government of Maharashtra Nagpur 440010 Maharashtra India

We report a rapid method of green chemistry approach for synthesis of gold nanoparticles（AuNPs）using Lagerstroemia speciosa leaf extract（LSE）. L. speciosa plant extract is known for its effective treatment of diabetes and kidney related problems. The green synthesis of Au NPs was complete within 30 min at 25°c. The same could also be achieved within 2 min at a higher reaction temperature（80°c）. Both uV–visible spectroscopy and transmission electron microscopy results suggest that the morphology and size distribution of Au NPs are dependent on the pH of gold solution,gold concentration,volume of LSE,and reaction time and temperature. comparison between Fourier transform infrared spectroscopy（FT-IR）spectra of LSE and the synthesized Au NPs indicate an active role of polyphenolic functional groups（from gallotannins,lagerstroemin,and corosolic acid）in the green synthesis and capping of Au NPs. The green route synthesized Au NPs show strong photocatalytic activity in the reduction of dyes viz.,methylene blue,methyl orange,bromophenol blue and bromocresol green,and 4-nitrophenol under visible light in the presence of Na BH4. The non-toxic and cost effective LSE mediated Au NPs synthesis proposed in this study is extremely rapid compared to the other reported methods that require hours to days for complete synthesis of Au NPs using various plant extracts. Strong and stable photocatalytic behavior makes Au NPs attractive in environmental applications,particularly in the reduction of organic pollutants in wastewater.

关键词： Green synthesis Gold nanoparticles Lagerstroemia speciosa Photocatalyst Dyes Nitroaromatic compound