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Effect of solar wind plasma parameters on space weather

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Research in Astronomy and Astrophysics 2015年第1期15卷 85-106页

作者： Balveer S.Rathore Dinesh c.Gupta subhash c.Kaushik School of Study in Physics Jiwaji UniversityGwalior Madhya Pradesh India

Today’s challenge for space weather research is to quantitatively predict the dynamics of the magnetosphere from measured solar wind and interplanetary magnetic field（IMF） conditions. correlative studies between geomagnetic storms（GMSs）and the various interplanetary（IP） field/plasma parameters have been performed to search for the causes of geomagnetic activity and develop models for predicting the occurrence of GMSs, which are important for space weather predictions. We find a possible relation between GMSs and solar wind and IMF parameters in three different situations and also derived the linear relation for all parameters in three *** the basis of the present statistical study, we develop an empirical model. With the help of this model, we can predict all categories of GMSs. This model is based on the following fact： the total IMF Btotalcan be used to trigger an alarm for GMSs, when sudden changes in total magnetic field Btotaloccur. This is the first alarm condition for a storm’s arrival. It is observed in the present study that the southward Bzcomponent of the IMF is an important factor for describing GMSs. A result of the paper is that the magnitude of Bzis maximum neither during the initial phase（at the instant of the IP shock） nor during the main phase（at the instant of Disturbance storm time（Dst） minimum）. It is seen in this study that there is a time delay between the maximum value of southward Bzand the Dst minimum, and this time delay can be used in the prediction of the intensity of a magnetic storm two-three hours before the main phase of a GMS. A linear relation has been derived between the maximum value of the southward component of Bzand the Dst, which is Dst =（-0.06）＋（7.65）Bz＋ *** auxiliary conditions should be fulfilled with this, for example the speed of the solar wind should, on average, be 350 km s-1 to 750 km s-1, plasma β should be low and, most importantly, plasma temperature should be low for intense storms. If the plasma tem

关键词： solar wind geomagnetic storms(GMSs) interplanetary magnetic field(IMF)

An experimental and numerical study of packing, compression, and caking behaviour of detergent powders

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Particuology 2014年第1期12卷 2-12页

作者： subhash c.Thakur Hossein Ahmadian Jin Sun Jin Y.Ooi School of Engineering University of Edinburgh Newcastle Innovation centre Procter and Gamble Technical Centre Ltd

This paper presents an experimental and numerical study of the packing, compression, and caking behaviour of spray dried detergent （SDD） powders with a two-fold aim： an experimental process of observation and evaluation of the packing, compression and caking behaviour of SDD powders, and a numerical approach based on discrete element modelling （DEM）. The mechanical properties, including the stress-strain response and the corresponding porosity change as a function of consolidation stress in a confined cylinder, the stress-strain response during unconfined shearing and the cake strength as a func- tion of consolidation stress, were evaluated and compared for different SDD powders using an extended uniaxial tester （Edinburgh Powder Tester - EPT）. The experiments using EPT showed excellent repro- ducibility in the measurement of packing, compression and caking behaviour and were therefore very useful for describing the handling characteristics of these powdered products including screening new products and different formulations. It was found that the sample with higher moisture had lower bulk porosity but higher compressibility and cake strength. The porosity, compressibility and cake strength were found to vary across different size fractions of the same sample. The larger sieve-cut samples had higher initial bulk porosity, compressibility and cake strength. It is revealed that moisture plays a sig- nificant role in packing, compression, and shearing behaviour of the powder. Three-dimensional DEM modelling using a recently developed elasto-plastic adhesive-frictional contact model showed that the contact model is able to capture the detergent behaviour reasonably well and can be used to model complex processes involving these powders.

关键词： Discrete element methodPowder flowcohesive materialUniaxial testPlasticitycontact model

Bioinspired nanomaterials for wearable sensing and human–machine interfacing

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Nano Research 2024年第2期17卷 445-461页

作者： Vishesh kashyap Junyi Yin Xiao Xiao Jun chen Department of Bioengineering University of CaliforniaLos AngelesLos AngelesCA 90095USA Department of Mechanical and Aerospace Engineering University of CaliforniaLos AngelesLos AngelesCA 90095USA

The inculcation of bioinspiration in sensing and human–machine interface(HMI)technologies can lead to distinctive characteristics such as conformability,low power consumption,high sensitivity,and unique properties like self-healing,self-cleaning,and *** sensing and HMI are fields rife with opportunities for the application of bioinspired nanomaterials,particularly when it comes to wearable sensory systems where biocompatibility is an additional *** review discusses recent development in bioinspired nanomaterials for wearable sensing and HMIs,with a specific focus on state-of-the-art bioinspired capacitive sensors,piezoresistive sensors,piezoelectric sensors,triboelectric sensors,magnetoelastic sensors,and electrochemical *** also present a comprehensive overview of the challenges that have hindered the scientific advancement in academia and commercialization in the industry.

关键词： bioinspired nanomaterials human–machine interface wearable sensors wearable bioelectronics

Pulsed electrolysis of carbon dioxide by large-scale solid oxide electrolytic cells for intermittent renewable energy storage

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carbon Energy 2023年第4期5卷 2-12页

作者： Anqi Wu chaolei Li Beibei Han Wu Liu Yang Zhang Svenja Hanson Wanbing Guan subhash c.Singhal Key Laboratory of Advanced Fuel cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboZhejiangChina Faculty of Science and Engineering University of Nottingham Ningbo ChinaNingboZhejiangChina

cO_(2) electrolysis with solid oxide electrolytic cells(SOEcs)using intermittently available renewable energy has potential applications for carbon neutrality and energy *** this study,a pulsed current strategy is used to replicate intermittent energy availability,and the stability and conversion rate of the cyclic operation by a large-scale flat-tube SOEc are *** hundred cycles under pulsed current ranging from -100 to -300 mA/cm^(2) with a total operating time of about 800 h were carried *** results show that after 100 cycles,the cell voltage attenuates by 0.041%/cycle in the high current stage of−300 mA/cm^(2),indicating that the lifetime of the cell can reach up to about 500 *** total cO_(2) conversion rate reached 52%,which is close to the theoretical value of 54.3% at -300 mA/cm^(2),and the calculated efficiency approached 98.2%,assuming heat *** study illustrates the significant advantages of SOEc in efficient electrochemical energy conversion,carbon emission mitigation,and seasonal energy storage.

关键词： carbon dioxide cyclic electrolysis pulse current solid oxide electrolytic cells

Larvicidal activity of Dregea volubilis and Bombax malabaricum leaf extracts against the filarial vector culex quinquefasciatus

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Asian Pacific Journal of Tropical Medicine 2011年第6期4卷 436-441页

作者： Emdad Hossain Anjali Rawani Goutam chandra subhash c.Mandal Jayanta Kumar Gupta Pharmacy college AzamgarhItauraPO:ChandeshwarAzamgarh 276128Uttar PradeshIndia Department of Zoology Mosquito Research UnitParasitology LaboratoryThe University of BurdwanBurdwan 713104West BengalIndia Department of Pharmaceutical Technology Jadavpur UniversityKolkata 700032India

Objective:To analyze the larvicidal activity of two plant leaf powder and leaf-extracts, Dregea volubilis and Bombax malabaricum against culex ***:The larvicidal bioassay was done for powdered leaves of Dregea volubilis and Bombax malabaricum individually and their methanol extracts against first-,second-,third- and fourth-instar larval forms of culex *** rate was recorded after 24,48 and 72 h of postexposure. Lc50 and LG90 values were calculated at different time intervals for third instar larvae. Results:All the graded concentration（0.1%,0.2%,0.3%,0.4%,0.5%） of powdered leaves showed significant（P c extracts of both the plants against culex *** corresponding c50 values were 56.97 ppm and 48.85 ppm,respectively after 24 h of *** is no mortality of non-target organism such as chironomous circumdatus,Oreochromis niloticus niloticus and Diplonichus annulatum within 72 h of post exposure to 0.1%,0.2%,0.3%crude powdered leaves and methanolic extracts of both the two individual plants under the laboratory *** results of preliminary qualitative phytochemical analysis of both the plants revealed the presence of many bioactive principles such as steroids,tannins,flavonoids,triterpenoids,saponins,etc. that may be responsible for their bio-control ***:The results have shown potential and eco-friendly use of both plant extracts against larva of culex quinquefasciatus for the first time.

关键词： Bombax malabaricum culex quinquefasciatus Dregea volubilis Larvicidal activity

Thickness Dependent Physical Properties of Thermally Evaporated Nanocrystalline cdSe Thin Films

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Acta Metallurgica Sinica(English Letters) 2015年第10期28卷 1299-1304页

作者： Anuradha Purohit subhash chander Satya Pal Nehra Mahendra Singh Dhaka Department of Physics Mohanlal Sukhadia University centre of Excellence for Energy and Environmental Studies Deenbandhu Chhotu Ram University of Science and Technology Microelectronics Research center Iowa State University of Science and Technology

This paper presents a study on thickness dependent physical properties of cadmium selenide thin films. The films of thickness 445, 631 and 810 nm were deposited employing thermal evaporation technique on glass and ITO-coated glass substrates followed by thermal annealing in air atmosphere at 200 °c. These films were subjected to X-ray diffractometer, UV-Vis spectrophotometer, scanning electron microscopy（SEM） and electrometer for structural, optical,surface morphological and electrical analysis respectively. The structural analysis reveals that the films are nanocrystalline in nature with cubic phase and preferred orientation（111）. The crystallographic parameters such as lattice constant, interplanar spacing, grain size, internal strain, dislocation density, number of crystallites per unit area and texture coefficient are calculated and discussed. The optical band gap is found in the range 1.75-1.92 e V and observed to increase with *** SEM study shows that the annealed films are uniform, fully covered and well defined. The electrical analysis shows that the conductivity is varied with film thickness and found within the order of semiconductor behavior.

关键词： Thin films X-ray diffraction Optical properties Electrical properties Evaporation

calophyllum inophyllum: recalcitrant or intermediate seed?

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Journal of Forestry Research 2012年第1期23卷 103-107页

作者： subhash Hathurusingha Nanjappa Ashwath centre for Plant and Water Science CQ University Rockhampton 4702 Australia

We studied seed storage behaviour of a multipurpose tree calophyllum inophyllum （clusiaseae）. Seeds were collected at Roslyn bay （2307′60＂ S, 150°43′60＂ E） central Queensland. Seed drying and desieeation tolerance tests were carried out according to International Seed Testing Association （ISTA） rules. We found c. inophyllum seeds to be recalcitrant and vulnerable to chilling injury, hence, unsuited for cold storage. c. inophyllum seeds maintained their viability for an appreciable period （〉 8 months） if stored in wanner environments.

关键词： calophyllum inophyllum germination moisture content recalcitrant storage longevity seed storage behaviour

Role of cYP2E1 gene polymorphisms association with hepatitis risk in Northeast India

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World Journal of Gastroenterology 2010年第38期16卷 4800-4808页

作者： Manab Deka Moumita Bose Bharati Baruah Purabi Deka Bose subhash Medhi Sujoy Bose Anjan Saikia Premashish Kar subhash Medhi Sujoy Bose Department of Biotechnology Gauhati University Department of Medicine Maulana Azad Medical college Medical and Gastroenterology Unit central Hospital N.F.Railway MaligaonGuwahati-781011India

AIM:To investigate hepatitis virus, genetic and environmental factors, and their interactions in predisposing patients to liver diseases in Northeast India. METHODS:A total of 104 jaundice patients and 124 community controls were included. Serological analysis was performed by routine enzyme-linked immunosorbent assay, and nucleic acid testing for hepatitis viruses was done by polymerase chain reaction (PcR), followed by PcR direct sequencing for viral genotyping. cytochrome P450 2E1 (cYP2E1) polymorphism was studied by PcR-restriction fragment length polymorphism. Nitrite and volatile nitrosamines in indigenous foods consumed routinely by the Northeast Indian ethnic population were estimated by Griess’s reagent and Gc-MS, ***: Hepatitis A virus (HAV) infection was predominantly prevalent (36.5%) in our cohort, followed by hepatitis B virus (HBV), hepatitis E virus (HEV) andhepatitis c virus. HBV genotype D and HEV genotype 1 were the most dominant. cYP2E1 c1/c2 genotype frequency was comparatively higher in alcoholic (Pcryptogenic (P=0.014, OR=8.714) patients, and was associated with significantly higher hepatitis risk (P=0.0.007,OR=6.489). Mutant c allele of cyp2E1 DraⅠ frequency was comparatively higher in HAV (P=0.006), alcoholic (P =0.003) and cryptogenic (P=0.014) cases, and was associated with overall hepatitis risk (P=0.026, OR=5.083). Indigenous foods, Gundruk, Kharoli, betel leaf and nuts were found to have the highest nitrite content. cONcLUSION: Apart from viral factors, cYP2E1 polymorphism might be associated with increased risk of liver diseases in Northeast India. Indigenous foods that contain nitrite and nitrosamine might be an associated risk factor.

关键词： Viral hepatitis cytochrome P450 2E1 Gene polymorphism Nitrites Nitrosamines

Bioactive nanotherapeutic trends to combat triple negative breast cancer

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Bioactive Materials 2021年第10期6卷 3269-3287页

作者： Pallabita chowdhury Upasana Ghosh Kamalika Samanta Meena Jaggi subhash c.chauhan Murali M.Yallapu Department of Pharmaceutical Sciences University of Tennessee Health Science CenterMemphisTNUSA Department of Biomedical Engineering School of EngineeringRutgers UniversityThe State University of New JerseyPiscatawayNJ08854USA Department of Immunology and Microbiology School of MedicineUniversity of Texas Rio Grande ValleyMcAllenTXUSA South Texas center of Excellence in cancer Research School of MedicineUniversity of Texas Rio Grande ValleyMcAllenTXUSA

The management of aggressive breast cancer,particularly,triple negative breast cancer(TNBc)remains a formidable challenge,despite treatment *** newer therapies such as atezolizumab,olaparib,and sacituzumab can tackle the breast cancer prognosis and/or progression,but achieved limited survival benefit(s).The current research efforts are aimed to develop and implement strategies for improved bioavailability,targetability,reduce systemic toxicity,and enhance therapeutic outcome of FDA-approved treatment *** review presents various nanoparticle technology mediated delivery of chemotherapeutic agent(s)for breast cancer *** article also documents novel strategies to employ cellular and cell membrane cloaked(biomimetic)nanoparticles for effective clinical *** technologies offer a safe and active targeting nanomedicine for effective management of breast cancer,especially TNBc.

关键词： Breast cancer treatment Triple negative breast cancer chemotherapy Nanoparticles Membrane cloaked nanoparticles Nanomedicine Biomimetic nanoparticles