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Loadability Assessment and Enhancement in Unbalanced Distribution Systems

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CSEE Journal of Power and Energy Systems 2018年第4期4卷 524-532页

作者： Arjun tyagi Ashu Verma Pradeep R.Bijwe Center for Energy Studies.IIT Delhi New DelhiIndia Department of Electrical Engineering IIT DelhiNew DelhiIndia

Voltage stability is a major concern in heavily loaded distribution *** determination of control parameters for loadability enhancement may maximize the utilization of distribution *** applicable studies,most of the approaches optimize real/reactive power losses for the current operating conditions of the distribution ***,these types of approaches increase the stability margin,such an increase may not be *** most important factor in loadability enhancement is representation of future load scenarios in addressing the optimization *** this paper a look ahead approach is developed for loadability enhancement of an unbalanced distribution *** determination of the critical loading point is conventionally done using continuation power flow,which is computationally very demanding,and also complex for implementation in unbalanced distribution ***,a new,computationally very efficient voltage stability indicator is developed here for determination of the loadability *** proposed methodology is demonstrated on IEEE 4 bus and 25 bus unbalanced distribution systems with different transformer connections.

关键词： loading stability margin voltage stability indicator unbalanced power flow

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心肌局部缺血的预适应(英文)

Acta Pharmacologica Sinica 2002年第10期23卷 3-8页

作者： Priya tyagi,Girish TAYAL Department of Pharmacology Maulana Azad Medical College New Delehi 110002 India Department of Pharmacology Maulana Azad Medical College New Delehi 110002 India

Preconditioning of the myocardium with short episodes of sublethal ischemia will delay the onset of necrosis during a subsequent lethal ischemic insult. Ischemic preconditioning seems to involve a variety of stress signals which include activation of membrane receptors and signaling molecules such as protein kinase C, mitogen-acti-vated protein kinases, opening of ATP-sensitive potassium channel, and expression of many protective proteins. The purpose of this review is to assess the current position in this field and to facilitate future research.

关键词：局部缺血预处理腺苷线粒体一氧化氮心肌

Phosphorus Starvation Tolerance in Rice Through Combined Physiological,Biochemical,and Proteome Analyses

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Rice science 2023年第6期30卷 613-631页

作者： Prathap V Suresh KUMAR Nand Lal MEENA Chirag MAHESHWARI Monika DALAL Aruna tyagi Division of Biochemistry Indian Council of Agricultural Research-Indian Agricultural Research InstituteNew Delhi 110012India Division of Germplasm Evaluation National Bureau of Plant Genetic ResourcesNew Delhi 110012India National Institute for Plant Biotechnology New Delhi 110012India

Phosphorus(P) deficiency limits the growth,development,and productivity of *** better understand the underlying mechanisms in P-deficiency tolerance and the role of Pup1 QTL in enhancing P use efficiency(PUE) for the development of P-efficient rice cultivars,a pair of contrasting rice genotypes(Pusa-44 and NIL-23) was applied to investigate the morpho-physio-biochemical and proteomic variation under P-starvation *** rice genotypes were grown hydroponically in a PusaRich medium with adequate P(16 mg/kg,+P) or without P(0 mg/kg,-P) for 30 d.P-starvation manifested a significant reductions in root and shoot biomass,shoot length,leaf area,total chlorophyll,and P,nitrogen and starch contents,as well as protein kinase *** stress increased root-to-shoot biomass ratio,root length,sucrose content,and acid phosphatase activity,particularly in the P-tolerant genotype(NIL-23).Comparative proteome analysis revealed several P metabolism-associated proteins(including OsCDPKs,OsMAPKs,OsCPKs,OsLecRK2,and OsSAPks) to be expressed in the shoot of NIL-23,indicating that multiple protein kinases were involved in P-starvation/deficiency ***,the up-regulated expression of OsrbcL,OsABCG32,OsSUS5,OsPoll-like B,and ClpC2 proteins in the shoot,and OsACA9,OsACA8,OsSPS2F,OsPP2C15,and OsBiP3 in the root of NIL-23,indicated their role in P-starvation stress control through the Pup1 QTL. Thus,our findings indicated that-P stress-responsive proteins,in conjunction with morpho-physio-biochemical modulations,improved PUE and made NIL-23 a P-deficiency tolerant genotype due to the introgression of the Pup1 QTL in the Pusa-44 background.

关键词： phosphorus deficiency Pup1 QTL protein kinase acid phosphatase proteome analysis rice

Influence of slope position and aspect on the vegetation attributes and treewater relations in forests of the central Himalayas

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Journal of Mountain Science 2023年第9期20卷 2592-2602页

作者： Vidit tyagi Surendra P.SINGH Ripu Daman SINGH Surabhi GUMBER Rajesh THADANI Rajiv PANDEY Dolphin(PG)Institute of Bio-medical and Natural Sciences Dehra Dun 248007India Central Himalayan Environment Association(CHEA) Dehradun 248007India Department of Forestry and Environmental Science DSB CampusKumaun UniversityNainital 263001India Centre for Ecology Development and Research(CEDAR) A-17 Mayfair GardensNew Delhi 110016India Indian Council of Forestry Research and Education(ICFRE) Dehra Dun 248007India

While the need for understanding the effects of topographical factors on forest structure and function is well recognized,comprehensive studies are *** study evaluates the effect of slope aspect and slope position on water relations and forest attributes across six forest types occurring between 400 m and 2600 m altitude in the Central Himalaya(27°-38°N).We found that predawn tree water potential and soil water potential were generally higher on moist north slope aspect(-0.78±0.05 MPa and-3.34±0.18 MPa,respectively)than dry south slope aspect(-0.82±0.18 MPa and-3.77±0.18 MPa,respectively).Across six different forests,these values were higher at hill base(-0.71±0.06 MPa and-2.77±0.19 MPa,tree predawn water potential and soil water potential,respectively)than other topographical *** favorable effect of north aspect and hill base was also observed in maintaining soil water and tree water potential during the dry *** attributes,such as species richness,unique species and plant density were also generally higher on north slope and hill base than southern aspect and lowest at hill *** forest types,the hill base provided shelter to 46 unique species,compared to 16-18 at the other positions,thus emphasizing its importance as refugia for species to survive climate change induced *** favorable conditions of hill base position not only contribute to increase in alpha diversity,but also to extended species distributional range.

关键词： Hill base Himalaya Refugia Unique species Water relation

A high methionine,low folate and vitamin B_6/B_(12) containing diet can be associated with memory loss by epigenetic silencing of netrin-1

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Neural Regeneration Research 2019年第7期14卷 1247-1254页

作者： Anuradha Kalani Pankaj Chaturvedi Komal Kalani Pradip K.Kamat Poonam Chaturvedi Neetu tyagi Department of Physiology School of MedicineUniversity of Louisville Medicinal Chemistry Department CSIR-Central Institute of Medicinal and Aromatic Plants Pharmacology Department and Toxicology Higuchi Biosciences CenterUniversity of Kansas Department of Neurology Dr.Ram Manohar Lohia Institute of Medical Sciences

Memory-epigenetics which is the loss of memory due to epigenetic modifications can be due to the silencing of genes involved in cognitive functions and this is the basis of the current *** hypothesize that a diet containing high methionine and low vitamins can lead to memory impairment by increasing global DNA methylation and therefore,silencing the netrin-1 gene,which encodes the glycoprotein involved in neurogenesis,axonal guidance and maintenance of the synaptic *** type(C57 BL/6 J) mice were fed with a diet containing excess methionine(1.2%),low-folate(0.08 mg/kg),vitamin B_6(0.01 mg/kg),and B_(12)(10.4 mg/kg) for 6 *** were examined weekly for the long-term memory function,using a passive avoidance test,which determined loss of fear-motivated long-term memory starting from the fourth week of ***,an increase in brain %5-methyl cytosine was observed starting from the 4 th week of diet in *** fed with a high methionine,low folate and vitamins containing diet showed a decrease in netrin-1 protein expression and an increase in netrin-1 gene promotor methylation,as determined by methylation-sensitive restriction enzyme-polymerase chain reaction *** increase in methylation of netrin-1 gene was validated by high-resolution melting and sequencing ***,the association of netrin-1 with memory was established by administering netrin that considerably restored long-term fear motivated *** together,these results suggest that a diet rich in methionine and lacking in folate and vitamin B_6/B_(12) can induce defects in learning and ***,the data indicates that decrease in netrin-1 expression due to hyper-methylation of its gene can be associated with memory *** animal procedures were approved by the Institutional Animal Care and Use Committee,University of Louisville,USA(No.A3586-01) on February 2,2018.

关键词： Alzheimer’s disease epigenetics memory methionine 5-methylcytosine methylation netrin-1

A Modified Plate Assay for Rapid Screening of Potassium-Solubilizing Bacteria

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Pedosphere 2016年第5期26卷 768-773页

作者： Mahendra Vikram Singh RAJAWAT Surender SINGH Satya Prakash tyagi Anil Kumar SAXENA Division of Microbiology Indian Agricultural Research Institute

The utility of microorganisms for solubilizing the unavailable forms of potassium(K) from soil has led to renewed interest in fabrication of rapid and sensitive plate assays for their isolation and screening. The present study developed a modified plate assay and compared it with previously reported methods for the isolation and screening of K-solubilizing bacteria. The newly developed plate assay is based on improved visualization of halo zone formation around the colonies on agar plates, through inclusion of an acid-base indicator dye, bromothymol blue(BTB), to modify the previously reported Aleksandrov medium. The halo zone exhibited a significant correlation(R = 0.939) with K released in liquid medium. The visualization of potential K solubilizers was improved using this method, which would help in detection of weak/non-acid producers based on secretion of organic acids in the medium. Organic acids in plate diffuse radially and form halo zones in response to reaction with the acid-base indicator dye BTB. Furthermore, K solubilization on plates with this method can be observed within 48–72 h, against the incubation time of 4–5 d needed in the earlier method. Therefore, the newly developed protocol for the plate assay was time saving, more sensitive, and beneficial in comparison to the previously reported Aleksandrov plate assay.

关键词： bromothymol blue (BTB) Aleksandrov medium halo zone formation indicator dye K solubilizers microorganisms

Nanomaterials for environmental burden reduction,waste treatment,and nonpoint source pollution control:a review

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Frontiers of Environmental Science & Engineering 2009年第3期3卷 249-264页

作者： Guobin SHAN Rao Y.SURAMPALLI Rajeshwar D.tyagi Tian C.ZHANG INRS-ETE University of QuebecQuebecG1K 9A9Canada U.S.Environmental Protection Agency Kansas CityKS 66117USA Civil Engineering University of Nebraska-LincolnOmahaNB 68182USA

Nanomaterials are applicable in the areas of reduction of environmental burden,reduction/treatment of industrial and agricultural wastes,and nonpoint source(NPS)pollution ***,environmental burden reduction involves green process and engineering,emissions control,desulfurization/denitrification of nonrenewable energy sources,and improvement of agriculture and food ***,reduction/treatment of industrial and agricultural wastes involves converting wastes into products,groundwater remediation,adsorption,delaying photocatalysis,and ***,NPS pollution control involves controlling water *** alter physical properties on a nanoscale due to their high specific surface area to volume *** are used as catalysts,adsorbents,membranes,and additives to increase activity and capability due to their high specific surface areas and nano-sized ***,nanomaterials are more effective at treating environmental wastes because they reduce the amount of material needed.

关键词： nanomaterials industrial agricultural nonpoint source pollution environmental burden reduction

Differential Expression of Iron Deficiency Responsive Rice Genes under Low Phosphorus and Iron Toxicity Conditions and Association of OsIRO3 with Yield in Acidic Soils

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Rice science 2023年第1期30卷 58-69页

作者： Ernieca Lyngdoh NONGBRI Sudip DAS Karma Landup BHUTIA Aleimo G.MOMIN Mayank RAI Wricha tyagi School of Crop Improvement College of Post Graduate Studies in Agricultural SciencesCentral Agricultural University(Imphal)Umiam 793103India

With the hypothesis that iron(Fe) deficiency responsive genes may play a role in Fe toxicity conditions,we studied five such genes OsNAS1,OsNAS3,OsIRO2,OsIRO3 and OsYSL16 across six contrasting rice genotypes for expression under high Fe and low phosphorus(P) conditions,and sequence *** Sahbhagi Dhan,Chakhao Poirieton and Shasharang were high yielders with no bronzing symptom visible under Fe toxic field conditions,and BAM350 and BAM811 were low yielders but did not show bronzing *** screening revealed that the number of crown roots and root length can be traits for consideration for identifying Fe toxicity tolerance in rice *** contents in rice roots and shoots of a high-yielding genotype KMR3 showing leaf bronzing were significantly *** response to 24 h high Fe stress,the expression levels of OsNAS3 were up-regulated in all genotypes except *** response to 48 h high Fe stress,the expression levels of OsNAS1 were3-fold higher in tolerant Shasharang,whereas in KMR3,it was significantly *** in response to 7 d excess Fe stress,the transcript abundances of OsIRO2 and OsNAS3 were contrasting in genotypes Shasharang and *** suggested that the reported Fe deficiency genes had a role in Fe toxicity and that in genotype KMR3 under excess Fe stress,there was disruption of metal *** the 48 h low P conditions,OsIRO2 and OsYSL16 were significantly up-regulated in Fe tolerant genotype Shasharang and in low P tolerant genotype Chakhao Poirieton,*** silico sequence analysis across 3 024 rice genotypes revealed polymorphism for 4 *** across OsIRO3and OsNAS3 revealed nucleotide polymorphism between tolerant and susceptible genotypes for Fe ***-synonymous single nucleotide polymorphisms and insertion/deletions(InDels) differing in tolerant and susceptible genotypes were identified.A marker targeting 25-bp InDel in OsIRO3,when run on a diverse panel of 43 rice geno

关键词： acidic soil low phosphorus iron toxicity OsNAS1 OsIRO3 rice yield

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框架结构化合物的热膨胀和相变特性(英文)

硅酸盐学报 2009年第5期37卷 703-714页

作者： tyagi A K[印度] ACHARY S N[印度] 印度巴巴原子研究中心化学部孟买400085

在现代精密器件中,因存在热梯度,材料的热膨胀成为一个重要的影响因素。通常材料受热后因化学键的伸长而产生膨胀,而仍有一些材料显示异常的(低的或负的)热膨胀特性,这些特性值得深入研究,并以期设计具有应用可能的热膨胀系数可控的材... 详细信息

在现代精密器件中,因存在热梯度,材料的热膨胀成为一个重要的影响因素。通常材料受热后因化学键的伸长而产生膨胀,而仍有一些材料显示异常的(低的或负的)热膨胀特性,这些特性值得深入研究,并以期设计具有应用可能的热膨胀系数可控的材料。众所周知,材料的异常热膨胀特性与框架构造化合物中的晶体结构常存在密切关系。近年来,人们对AMo2O8,APO4,A2Mo3O12类系列框架构造化合物进行了研究,以了解晶体结构对其热膨胀特性和相转变过程的影响。本文综合评述了影响这类材料热膨胀特性和相转变过程相关的结晶学研究结果。

关键词：负热膨胀框架构造化合物晶体结构相变 X射线衍射中子衍射膨胀计