检索结果-南通市图书馆

Influence of cerium ions on structure-dependent magnetic properties of Ba-Sr M-type hexaferrite nanocrystals

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 Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram A.Pawar Sunil M.Patange P.M.Dighe Sher Singh meena Abdullah GAl-Sehemi Mehboobali Pannipara Santosh S.Jadhav Department of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia Department of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Padmashri Vikhe Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia Solid State Physics Division Bhabha Atomic Research CentreMumbai400085MaharashtraIndia Department of Chemistry King Khalid UniversityAbha61413Saudi Arabia Department of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present study is a systematic effort to investigate the structure-sensitive magnetic parameters of Ce^(3+) substituted Ba-Sr hexaferrite nanocrystals chemically formulated as Ba_(0.5)Sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powders were prepared using the sol-gel self-ignition route and structurally characterized by means of powder X-ray diffraction and Fourier transform infrared *** creation of the M-type hexaferrite phase within the synthesized samples was revealed from the Rietveld refinement of the X-ray *** occurrence of a secondary phase of CeO_(2) was revealed within the hexaferrites for the substitution,x> *** refined X-ray diffraction data were utilized to compute the lattice parameters,X-ray density,and lattice parameter *** crystal structure plotted from the refined XRD data reveals the occupancy of the ions at different lattice *** XPS data of the hexaferrite were analyzed to confirm the oxidation states of the constituent *** nanocrystalline nature of the hexaferrites was revealed from the crystallite sizes calculated using Scherer's *** analysis of FTIR spectra confirms that only a fraction of Ce^(3+)accommodated in the lattice and the remaining Ce content reside in the form of the CeO_(2) *** morphology of the hexaferrites was analyzed from the FESEM profiles of the ferrite *** magnetic behavior study was performed by analyzing the Curie temperature,hysteresis loops,and hyperfine interactions by means of susceptibility,V.S.M,and Mossbauer spectroscopy,*** hexaferrites with increasing coercivity,decreasing saturation magnetization,and decreasing Curie temperature are reported in the *** substituted Ce^(3+)ions inhibit the grain growth and create lattice imperfections giving rise to hexaferrites with tuned magnetic parameters suitable for different applications.

关键词： Ba-Sr hexaferrite Ce^(3+)substitution XPS Saturation magnetization Coercivity M?ssbauer spectroscopy

Predictive value of neutrophil-to-lymphocyte ratio in in-hospital mortality in sepsis patients:A cross-sectional study

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

Journal of Acute Disease 2024年第3期13卷 106-110页

作者： Pankaj Kumar Jain Manoj Seval Vikas meena Dinesh Kumar meena Department of Internal Medicine Government Medical CollegeKotaIndia

Objective:To explore the predictive value of neutrophil-to-lymphocyte ratio(NLR)in in-hospital mortality in sepsis ***:A prospective observational cross-sectional study was conducted on 100 patients with *** data about the patient’s demography,medical history,general examination including pulse rate,blood pressure,etc,use of vasopressor support,need for renal replacement therapy,mechanical ventilation,outcome,and lab parameters including total lymphocyte count with neutrophil-to-lymphocyte ratio were *** parameters between survivals and non-survivals were ***:Out of 100 patients,80%were from rural *** patients were 50 to 59 years old.26 Patients were *** patients in the nonsurvivor group were older and more had a history of diabetes mellitus when compared with the survivor *** non-survivor group had a higher NLR,APACHE栻,and SOFA ***:NLR is a readily available parameter and can be used as a good prognostic indicator for mortality in sepsis patients.

关键词： Neutrophil-to-lymphocyte ratio Sepsis Intensive Care Unit Mortality APACHE score SOFA score

Tuning of Optical Properties via Annealing of Bismuth Ferrite (BiFeO3) Thin Films

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 Composite Materials 2024年第3期14卷 124-131页

作者： Harish Kumar meena Khushbu meena Reena Verma Karishma Jain Sushil Kumar Jain Kedar Babu Sharma Balram Tripathi Department of Physics S S Jain Subodh PG College Jaipur India Department of Physics University of Rajasthan Jaipur India Department of Physics School of Physical Sciences Manipal University Jaipur Jaipur India

In this study we are reporting annealing induced optical properties of bismuth ferrite (BiFeO3) thin films deposited on glass substrate via spin coating at 5000 rpm. The structural, optical and surface morphology of BiFeO3 (BFO) thin films have been studied via X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Optical absorption (UV-Vis) and Photoluminescence (PL) spectroscopy. XRD spectra confirm annealing induced phase formation of BiFeO3 possessing a rhombohedral R3c structure. The films are dense and without cracks, although the presence of porosity in BFO/glass was observed. Moreover, optical absorption spectra indicate annealing induced effect on the energy band structure in comparison to pristine BiFeO3. It is observed that annealing effect shows an intense shift in the UV-Vis spectra as diffuse absorption together with the variation in the optical band gap. The evaluated optical band gap values are approximately equal to the bulk band gap value of BiFeO3.

关键词： Optical Properties Annealing Ferroelectrics Photo Luminescence BFO Thin Films

Prediabetes: An overlooked risk factor for major adverse cardiac and cerebrovascular events in atrial fibrillation patients

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 Diabetes 2024年第1期15卷 24-33页

作者： Rupak Desai Nishanth Katukuri Sumaja Reddy Goguri Azra Kothawala Naga Ruthvika Alle meena Kumari Bellamkonda Debankur Dey Sharmila Ganesan Minakshi Biswas Kuheli Sarkar Pramoda Prattipati Shaylika Chauhan Independent Researcher Independent ResearcherAtlantaGA 30079United States Department of Internal Medicine Mayo ClinicRochesterMN 55902United States Department of Medicine Chalmeda Anand Rao Institute of Medical SciencesTelangana 505001India Department of Medicine Jawaharlal Nehru Medical CollegeBelgaum 590010India Department of Medicine Narayana Medical CollegeAndhra PradeshNellore 524003India Department of Medicine Dr Pinnamaneni Siddhartha Institute of Medical Sciences and Research FoundationVijaywada 521286India Department of Medicine Medical College KolkataKolkata 700073India Department of Medicine P.E.S.Institute of Medical Sciences and ResearchAndhra Pradesh 517425India Department of Medicine Shaheed Ziaur Rahman Medical CollegeBogra 5800Bangladesh Department of Medicine College of Medicine and J.N.M HospitalKalyani 741235India Department of Medicine Jawaharlal Nehru Medical College IndiaKarnatakaBelagavi 590010India Department of Internal Medicine Geisinger Health SystemWikes-BarrePA 18702United States

BACKGROUND Prediabetes is a well-established risk factor for major adverse cardiac and cerebrovascular events(MACCE).However,the relationship between prediabetes and MACCE in atrial fibrillation(AF)patients has not been extensively ***,this study aimed to establish a link between prediabetes and MACCE in AF *** To investigate a link between prediabetes and MACCE in AF *** We used the National Inpatient Sample(2019)and relevant ICD-10 CM codes to identify hospitalizations with AF and categorized them into groups with and without prediabetes,excluding *** primary outcome was MACCE(all-cause inpatient mortality,cardiac arrest including ventricular fibrillation,and stroke)in AF-related *** Of the 2965875 AF-related hospitalizations for MACCE,47505(1.6%)were among patients with *** prediabetes cohort was relatively younger(median 75 vs 78 years),and often consisted of males(56.3%vs 51.4%),blacks(9.8%vs 7.9%),Hispanics(7.3%vs 4.3%),and Asians(4.7%vs 1.6%)than the non-prediabetic cohort(P<0.001).The prediabetes group had significantly higher rates of hypertension,hyperlipidemia,smoking,obesity,drug abuse,prior myocardial infarction,peripheral vascular disease,and hyperthyroidism(all P<0.05).The prediabetes cohort was often discharged routinely(51.1%vs 41.1%),but more frequently required home health care(23.6%vs 21.0%)and had higher *** adjusting for baseline characteristics or comorbidities,the prediabetes cohort with AF admissions showed a higher rate and significantly higher odds of MACCE compared to the non-prediabetic cohort[18.6%vs 14.7%,odds ratio(OR)1.34,95%confidence interval 1.26-1.42,P<0.001].On subgroup analyses,males had a stronger association(aOR 1.43)compared to females(aOR 1.22),whereas on the race-wise comparison,Hispanics(aOR 1.43)and Asians(aOR 1.36)had a stronger association with MACCE with prediabetes vs whites(aOR 1.33)and blacks(aOR 1.21).CONCLUSION This population-

关键词： Prediabetes Atrial fibrillation Cardiovascular disease risk Major adverse cardiovascular and cerebrovascular events Stroke Mortality

Evaluating the Efficacy of Cervical Tactile Ultrasound Technique as a Predictive Tool for Spontaneous Preterm Birth

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 Obstetrics and Gynecology 2024年第5期14卷 832-846页

作者： Vladimir Egorov Todd Rosen Jennifer Hill meena Khandelwal Victors Kurtenoks Brendan Francy Noune Sarvazyan Advanced Tactile Imaging Inc. Ewing New Jersey USA Department of Obstetrics Gynecology and Reproductive Sciences Rutgers Robert Wood Johnson Medical School New Brunswick New Jersey USA Department of Maternal-Fetal Medicine Cooper Medical School of Rowan University Camden New Jersey USA

Background: Premature cervical softening and shortening may be considered an early mechanical failure that predispose to preterm birth. Purpose: This study aims to explore the applicability of an innovative cervical tactile ultrasound approach for predicting spontaneous preterm birth (sPTB). Materials and Methods: Eligible participants were women with low-risk singleton pregnancies in their second trimester, enrolled in this prospective observational study. A Cervix Monitor (CM) device was designed with a vaginal probe comprising four tactile sensors and a single ultrasound transducer operating at 5 MHz. The probe enabled the application of controllable pressure to the external cervical surface, facilitating the acquisition of stress-strain data from both anterior and posterior cervical sectors. Gestational age at delivery was recorded and compared against cervical elasticity. Results: CM examination data were analyzed for 127 women at 240/7 - 286/7 gestational weeks. sPTB was observed in 6.3% of the cases. The preterm group exhibited a lower average cervical stress-to-strain ratio (elasticity) of 0.70 ± 0.26 kPa/mm compared to the term group’s 1.63 ± 0.65 kPa/mm with a p-value of 1.1 × 10−4. Diagnostic accuracy for predicting spontaneous preterm birth based solely on cervical elasticity data was found to be 95.0% (95% CI, 88.5 - 100.0). Conclusion: These findings suggest that measuring cervical elasticity with the designed tactile ultrasound probe has the potential to predict spontaneous preterm birth in a cost-effective manner.

关键词： Cervical Elasticity Spontaneous Preterm Birth Tactile Ultrasound Probe

Exosomes derived from tumor adjacent fibroblasts efficiently target pancreatic tumors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2024年第7期14卷 3009-3026页

作者： Saini Setua Shabia Shabir Poornima Shaji Ana Martinez Bulnes Anupam Dhasmana Swathi Holla Nivesh K.Mittal Nirakar Sahoo Tripti Saini Francesco Giorgianni Mohammad Sikander Andrew E.Massey Bilal B.Hafeez Manish K.Tripathi Vincent P.Diego meena Jaggi Junming Yue Nadeem Zafar Murali M.Yallapu Stephen W.Behrman Sheema Khan Subhash C.Chauhan Department of Pharmaceutical Sciences College of Pharmacyand College of MedicineUniversity of Tennessee Health Science Center(UTHSC)MemphisTN 36163USA Department of Computer Science Islamic University of Science and TechnologyAwantiporaJ&K 192122India Department of Immunology and Microbiology School of MedicineUniversity of Texas Rio Grande ValleyMcAllenTX 78504USA South Texas Center of Excellence in Cancer Research School of Medicinethe University of Texas Rio Grande ValleyMcAllenTX 78504USA Himalayan School of Biosciences and Cancer Research Institute Himalayan Institute of Medical SciencesSwami Rama Himalayan UniversityDehradun 248016India Plough Center for Sterile Drug Delivery Solutions UTHSCMemphisTN 38104USA Department of Biology College of SciencesUTRGVMcAllenTX 78539USA National Institute of Biomedical Imaging and Bioengineering(NIBIB) National Institutes of HealthBethesdaMD 20892USA South Texas Diabetes and Obesity Institute UTRGVMcAllenTX 78504USA Dept.of Laboratory Medicine&Pathology University of WashingtonSeattleWA 98195USA Department of Surgery Baptist Memorial Medical EducationBaptist Memorial HospitalMemphisTN 38120USA Baptist Health Sciences University MemphisTN 38104USA

The application of extracellular vesicles,particularly exosomes(EXs),is rapidly expanding in the field of medicine,owing to their remarkable properties as natural carriers of biological *** study investigates utilization of exosomes derived from stromal cells of tumor adjacent normal tissues(NAF-EXs)for personalized medicine,which can be derived at the time of diagnosis by endoscopic ***,we show that exosomes(EXs)derived from NAFs demonstrate differential bio-physical characteristics,efficient cellular internalization,drug loading efficiency,pancreatic tumor targeting and delivery of ***-derived EXs(NAF-EXs)were used for loading ormeloxifene(ORM),a potent anti-cancer and desmoplasia inhibitor as a model *** found that ORM maintains normal fibroblast cell phenotype and renders them incompatible to be triggered for a CAF-like phenotype,which may be due to regulation of Ca^(2+) influx in fibroblast ***-EXs-ORM effectively blocked oncogenic signaling pathways involved in desmoplasia and epithelial mesenchymal transition(EMT)and repressed tumor growth in xenograft mouse *** conclusion,our data suggests preferential tropism of NAF-EXs for PDAC tumors,thus imply feasibility of developing a novel personalized medicine for PDAC patients using autologous NAF-EXs for improved therapeutic outcome of anti-cancer ***,it provides the opportunity of utilizing this biological scaffold for effective therapeutics in combination with standard therapeutic regimen.

关键词： Pancreatic cancer Tumor adjacent normal tissue fibroblasts(NAF) Desmoplasia Extracellular vesicles Exosomes Tumor targeting Ormeloxifene Personalized medicine

Microbial biodegradation of plastics: Challenges, opportunities, and a critical perspective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2022年第12期16卷 133-154页

作者： Shilpa Nitai Basak Sumer Singh meena Department of Biotechnology Dr.B.R.Ambedkar National Institute of Technology JalandharPunjab144027India

The abundance of synthetic polymers has increased due to their uncontrolled utilization and disposal in the *** recalcitrant nature of plastics leads to accumulation and saturation in the environment,which is a matter of great *** exponential rise has been reported in plastic pollution during the corona pandemic because of PPE kits,gloves,and face masks made up of single-use *** physicochemical methods have been employed to degrade synthetic polymers,but these methods have limited efficiency and cause the release of hazardous metabolites or by-products in the *** species,isolated from landfills and dumpsites,have utilized plastics as the sole source of carbon,energy,and biomass *** involvement of microbial strains in plastic degradation is evident as a substantial amount of mineralization has been ***,the complete removal of plastic could not be achieved,but it is still effective compared to the preexisting traditional ***,microbial species and the enzymes involved in plastic waste degradation could be utilized as eco-friendly ***,microbial biodegradation approaches have a profound scope to cope with the plastic waste problem in a cost-effective and environmental-friendly ***,microbial degradation can be optimized and combined with physicochemical methods to achieve substantial *** review summarizes the different microbial species,their genes,biochemical pathways,and enzymes involved in plastic biodegradation.

关键词： Plastic-waste Polymers Health-hazards Biodegradation Microorganisms Enzymes

Effects of Large-Scale Climatic Oscillations on the Variability of the Indian Summer Monsoon Rainfall

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 Meteorological Research 2023年第3期37卷 341-352页

作者： Deepak meena Athira K Sarmistha SINGH Department of Civil Engineering Indian Institute of TechnologyPalakkadKerala 678557India

In India,large-scale climatic oscillations have strong influences on the Indian summer monsoon rainfall(ISMR),which plays a crucial role in India’s agricultural production and economic ***,there are limited studies in India that explore the influences of decadal and multidecadal oscillations on the ISMR and associated El Niño–Southern Oscillation(ENSO).Therefore,in this study we carried out a comprehensive and detailed investigation to understand the influences of ENSO,Pacific decadal oscillation(PDO),and Atlantic multidecadal oscillation(AMO)on ISMR across different regions in *** statistical significance of ISMR associated with different phases(positive/warm and negative/cold)of ENSO,PDO,and AMO(individual analysis),and combined ENSO–AMO,and ENSO–PDO(coupled analysis)were analysed by using the nonparametric Wilcoxon Rank Sum(WRS)*** individual analysis results indicate that in addition to the ENSO teleconnection,AMO and PDO significantly affect the spatial patterns of *** analysis was performed to understand how the phase shift of PDO and AMO has modulated the rainfall during El Niño and La Niña *** results indicate that the La Niña associated with a positive PDO phase caused excessive precipitation of about 21%–150%in the peninsular,west–central,and hilly regions compared to the individual effect of ENSO/PDO/AMO on ISMR;similarly,the west–central,coastal,and northwest regions received 15%–56%of excessive ***,during the El Niño combined with PDO positive(AMO positive),above-normal precipitation was observed in hilly,northeast,and coastal(hilly,northeast,west–central,and coastal)regions,opposite to the results obtained from the individual ENSO *** study emphasizes the importance of accounting the decadal and multidecadal forcing when examining variations in the ISMR during different phases of ENSO events.

关键词： climatic oscillation Indian summer monsoon rainfall(ISMR) El Niño-Southern Oscillation(ENSO) Atlantic multidecadal oscillation(AMO) Pacific decadal oscillation(PDO) Wilcoxon Rank Sum(WRS)test

TMTACS: Two-Tier Multi-Trust-Based Algorithm to Countermeasure the Sybil Attacks

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

Computers, Materials & Continua 2022年第11期73卷 3497-3512页

作者： meena Bharti Shaveta Rani Paramjeet Singh Department of Computer Science and Engineering I.K.Gujral Punjab Technical UniversityKapurthala144603PunjabIndia Department of Computer Science and Engineering Maharaja Ranjit Singh Punjab Technical UniversityBathinda151001PunjabIndia

Mobile Ad hoc Networks(MANETs)have always been vulnerable to Sybil attacks in which users create fake nodes to trick the system into thinking they’re *** fake nodes need to be detected and deactivated for security reasons,to avoid harming the data collected by various *** MANET is an emerging field that promotes trust management among *** is becoming more essential in the communication process,which is why clear and honest communication strategies are *** Management allows for MANET devices with different security protocols to *** a device finds difficulty in sending a message to the destination,the purpose of the communication process won’t be achieved and this would disappoint both that device and all of your devices in *** paper presents,the Two-Tier Multi-Trust based Algorithm for Preventing Sybil Attacks in MANETs(TMTACS).The TMTACS provides a two-tier security mechanism that can grant or revoke trust in the Nodes of the ***’s a smart way to identify Sybil nodes in the system.A proficient cluster head selection algorithm is also defined,which selects cluster head efficiently and does load balancing to avoid resource consumption from a single node ***,for routing efficient path is selected to deteriorate energy consumption and maximize *** recent technique is compared with Secured QoS aware Energy Efficient Routing(SQEER),Adaptive Trust-Based Routing Protocol(ATRP),and Secure Trust-Aware Energy-Efficient Adaptive Routing(STEAR)in terms of Packet Delivery Ratio(PDR),consumption of energy *** simulation was performed on MATrix LABoratory(MATLAB)and the results achieved by the present scheme are better than existing techniques.

关键词： Malicious node sybil attack MANET trust management security