检索结果-南通市图书馆

Exploring luminescence quenching on lanthanide-doped nanoparticles through changing the spatial distribution of sensitizer and activator

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第5期17卷 4517-4524页

作者： Jiwei Li Yao Xie Renrui Sun Junxun Zhou Lining Sun department of Chemistry College of SciencesShanghai UniversityShanghai 200444China department of Physics College of SciencesShanghai UniversityShanghai 200444China School of Medicine Shanghai UniversityShanghai 200444China

Luminescence quench is common in overdoped upconversion *** methods have been proposed to counteract the adverse effects of concentration quenching on luminescence,but in upconversion nanoparticles that are highly doped with both sensitizers and activators,the factors that contribute to the diminishing of the emission cannot be summarized by a single ***,a core-shell design is used to spatially separate the sensitizer(Yb^(3+))and activator(Er^(3+))and to modulate the emission by changes in the distribution position as well as the concentration of the dopant ions in order to probe the factors affecting the *** the sensitizer ions are located in the core,the luminescence intensity of the nanoparticles is significantly weaker than that of the other distribution,which implies that the effect of sensitizer and activator on luminescence in the highly doped state has a different and more complex *** intensity of the emission is more affected by Yb^(3+)than Er^(3+),which includes not only the self-quenching of Yb^(3+),but also the dominance in the Yb^(3+)-Er^(3+)*** this finding may provide new ideas for revealing the reasons for the diminished luminescence of highly doped upconversion nanoparticles and thus for enhancing luminescence.

关键词： upconversion luminescence lanthanide ion core-shell nanoparticles concentration quenching cross-relaxation

Cavity optomechanics with directionally squeezed light

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 181-182页

作者： Pierre Meystre department of Physics and college of Optical sciences University of ArizonaTucson 85721USA

It is well understood that the Heisenberg uncertainty principle imposes a fundamental limit on the precision of quantum *** way to get around this difficulty is to exploit quantum states that minimize the uncertainty on the observable of interest,increasing in the process the uncertainty on the conjugate *** states of the electromagnetic field.

关键词： field observable quantum

维普期刊数据库

Smart Healthcare Activity Recognition Using Statistical Regression and Intelligent Learning

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第1期78卷 1189-1205页

作者： K.Akilandeswari Nithya Rekha Sivakumar Hend Khalid Alkahtani Shakila Basheer Sara Abdelwahab Ghorashi department of Computer sciences Government Arts College(Autonomous)Salem636007India department of Computer sciences College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadh11671Saudi Arabia department of Information Systems College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadh11671Saudi Arabia

In this present time,Human Activity Recognition(HAR)has been of considerable aid in the case of health monitoring and *** exploitation of machine learning with an intelligent agent in the area of health informatics gathered using HAR augments the decision-making quality and *** many research works conducted on Smart Healthcare Monitoring,there remain a certain number of pitfalls such as time,overhead,and falsification involved during ***,this paper proposes a Statistical Partial Regression and Support Vector Intelligent Agent Learning(SPR-SVIAL)for Smart Healthcare *** first,the Statistical Partial Regression Feature Extraction model is used for data preprocessing along with the dimensionality-reduced features extraction ***,the input dataset the continuous beat-to-beat heart data,triaxial accelerometer data,and psychological characteristics were acquired from IoT wearable *** attain highly accurate Smart Healthcare Monitoring with less time,Partial Least Square helps extract the dimensionality-reduced *** that,with these resulting features,SVIAL is proposed for Smart Healthcare Monitoring with the help of Machine Learning and Intelligent Agents to minimize both analysis falsification and *** evaluation is carried out for factors such as time,overhead,and false positive rate accuracy concerning several *** quantitatively analyzed results indicate the better performance of our proposed SPR-SVIAL method when compared with two state-of-the-art methods.

关键词： Internet of Things smart health care monitoring human activity recognition intelligent agent learning statistical partial regression support vector

Multivariate form of Hermite sampling series

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2024年第2期39卷 253-265页

作者： Rashad M.Asharabi department of Mathematics College of Arts and SciencesNajran UniversityNajranSaudi Arabia

In this paper,we establish a new multivariate Hermite sampling series involving samples from the function itself and its mixed and non-mixed partial derivatives of arbitrary *** multivariate form of Hermite sampling will be valid for some classes of multivariate entire functions,satisfying certain growth *** will show that many known results included in Commun Korean Math Soc,2002,17:731-740,Turk J Math,2017,41:387-403 and Filomat,2020,34:3339-3347 are special cases of our ***,we estimate the truncation error of this sampling based on localized sampling without decay *** examples are also presented.

关键词： multidimensional sampling series sampling with partial derivatives contour integral truncation error

维普期刊数据库

Recent advances in glycerol valorization through electrocatalytic methods

在线全文

学校读者我要写书评

暂无评论

Tungsten 2024年第4期6卷 696-710页

作者： Hao-Hai Dong Yu-Xin Zhu Yi-Gu Li Jia-Yan Liang Ya Tan Xin-Yue Zhang Hao-Min Jiang Liu Lin Ze-Min Sun Center for Advanced Materials Research & college of Arts and sciences Beijing Normal University department of Chemistry University College London

The recent tremendous growth of biodiesel production from vegetable oils or waste fats has led to increased glycerol accumulation as a by-product of this *** sparked attention towards glycerol use and valorization of this largely available and cheap *** several methods for glycerol valorization,electrochemical glycerol oxidation reaction(EGOR)is an attractive alternative anodic reaction to oxygen evolution reaction for a variety of electrolytic synthesis,due to the low thermodynamic ***,the EGOR at the anode can be coupled with a cathodic hydrogen evolution reaction to achieve efficient energy conversion in an aqueous electrolytic *** review provides a comprehensive summary and critical analysis of glycerol electrochemical oxidation research during the last 5 *** review focuses on the recent development and prospects of electrochemical pathways(indirect or direct routes) for application in the *** particular,the recent development and prospects of using noble and non-noble group metal catalysts for glycerol electro-oxidation are ***,reaction product selectivity analysis and conversion efficiency are also highlighted.

关键词： Active oxygen species Electrocatalytic methods Glycerol Noble metal catalysts Non-noble metal catalysts

CD87-targeted BiTE and CAR-T cells potently inhibit invasive nonfunctional pituitary adenomas

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Life sciences 2024年第10期67卷 2169-2185页

作者： Yuan Ren Xinjie Bao Ming Feng Bing Xing Wei Lian Yong Yao Renzhi Wang department of Neurosurgery Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical College

Recently, bispecific T-cell engagers(BiTEs) and chimeric antigen receptor-modified T cells(CAR-Ts) have been shown to have high therapeutic efficacy in hematological tumors. CD87 is highly expressed in solid tumors with an oncogenic function. To assess their cytotoxic effects on invasive nonfunctioning pituitary adenomas(iNFPAs), we first examined CD87 expression and its effects on the metabolism of iNFPA cells. We generated CD87-specific BiTE and CAR/IL-12 T cells, and their cytotoxic effects on iNFPAs cells and in mouse models were determined. CD87 had high expression in i NFPA tissue and cell samples but was undetected in noncancerous brain samples. CD87×CD3 BiTE and CD87 CAR/IL-12 T-cells showed antigenic specificity and exerted satisfactory cytotoxic effects, decreasing tumor cell proliferation in vitro and reducing existing tumors in experimental mice. Overall, the above findings suggest that CD87 is a promising target for the immunotherapeutic management of iNFPAs using anti-CD87 BiTE and CD87-specific CAR/IL-12 T cells.

关键词： CD87 chimeric antigen receptor T cells invasive non-functional pituitary adenomas bispecific T cell engager Warburg effect

同方期刊数据库

Bile acid metabolism and signaling in health and disease:molecular mechanisms and therapeutic targets

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2024年第5期9卷 2014-2064页

作者： Joshua S.Fleishman Sunil Kumar department of Pharmaceutical sciences College of Pharmacy and Health SciencesSt.John’s UniversityQueensNYUSA

Bile acids,once considered mere dietary surfactants,now emerge as critical modulators of macronutrient(lipid,carbohydrate,protein)metabolism and the systemic pro-inflammatory/anti-inflammatory *** acid metabolism and signaling pathways play a crucial role in protecting against,or if aberrant,inducing cardiometabolic,inflammatory,and neoplastic conditions,strongly influencing health and *** curative treatment exists for any bile acid influenced disease,while the most promising and well-developed bile acid therapeutic was recently rejected by the ***,we provide a bottom-up approach on bile acids,mechanistically explaining their biochemistry,physiology,and pharmacology at canonical and non-canonical *** this mechanistic model of bile acids,we explain how abnormal bile acid physiology drives disease pathogenesis,emphasizing how ceramide synthesis may serve as a unifying pathogenic feature for cardiometabolic *** provide an in-depth summary on pre-existing bile acid receptor modulators,explain their shortcomings,and propose solutions for how they may be ***,we rationalize novel targets for further translational drug discovery and provide future *** than dismissing bile acid therapeutics due to recent setbacks,we believe that there is immense clinical potential and a high likelihood for the future success of bile acid therapeutics.

关键词： metabolism rejected shortcomings

OsPDR20 is an ABCG metal transporter regulating cadmium accumulation in rice

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 Environmental sciences 2024年第2期136卷 21-34页

作者： He Li Chao Li Di Sun Zhi Min Yang department of Biochemistry and Molecular Biology College of Life SciencesNanjing Agricultural UniversityNanjing 210095China

Cadmium(Cd)is a non-essential toxic heavy metal,seriously posing high environmental risks to human *** genetic resources relevant to functional genes is important for understanding the metal absorption and accumulation in crops and bioremediation of Cd-polluted *** study investigated a functionally uncharacterized ATP binding cassette transporter G family(ABCG)gene encoding a Pleiotropic Drug Resistance 20(PDR20)type metal transporter which is localized to the plasma membrane of ***20 was transcriptionally expressed in almost all tissues and organs in lifespan and was strongly induced in roots and shoots of young rice under Cd *** expression of OsPDR20 in a yeast mutant ycf1 sensitive to Cd conferred cellular tolerance with less Cd *** of OsPDR20 by RNA interference(RNAi)moderately attenuated root/shoot elongation and biomass,with reduced chlorophylls in rice grown under hydroponic medium with 2 and 10μmol/L Cd,but led to more Cd accumulation.A field trial of rice grown in a realistic Cd-contaminated soil(0.40 mg/kg)showed that RNAi plants growth and development were also compromised compared to wild-type(WT),with smaller panicles and lower spikelet fertility but little effect on yield of ***,OsPDR20 suppression resulted in unexpectedly higher levels of Cd accumulation in rice straw including lower leaves and culm and *** results suggest that OsPDR20 is actively involved in Cd accumulation and homeostasis in rice *** increased Cd accumulation in the RNAi plants has the potential application in phytoremediation of Cd-polluted wetland soils.

关键词： Rice ABCG transporter Cadmium accumulation Phytoremediation

维普期刊数据库

An Online Fake Review Detection Approach Using Famous Machine Learning Algorithms

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第2期78卷 2767-2786页

作者： Asma Hassan Alshehri department of Computer sciences College of Computer Engineering and SciencesPrince Sattam bin Abdulaziz UniversityAl KharjSaudi Arabia

Online review platforms are becoming increasingly popular,encouraging dishonest merchants and service providers to deceive customers by creating fake reviews for their goods or *** Sybil accounts,bot farms,and real account purchases,immoral actors demonize rivals and advertise their *** academic and industry efforts have been aimed at detecting fake/fraudulent product or service evaluations for *** primary hurdle to identifying fraudulent reviews is the lack of a reliable means to distinguish fraudulent reviews from real *** paper adopts a semi-supervised machine learning method to detect fake reviews on any website,among other *** reviews are classified using a semi-supervised approach(PU-learning)since there is a shortage of labeled data,and they are ***,classification is performed using the machine learning techniques Support Vector Machine(SVM)and Nave *** performance of the suggested system has been compared with standard works,and experimental findings are assessed using several assessment metrics.

关键词： Security fake review semi-supervised learning ML algorithms review detection