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Organic-inorganic halide perovskites for memristors

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Journal of Semiconductors 2023年第9期44卷 39-46页

作者： Memoona Qammar Bosen Zou jonathan e.halpert Department of Chemistry Hong Kong University of Science and Technology(HKUST)Clear Water Bay RoadKowloon 999077Hong Kong SARChina

Organic-inorganic halides perovskites(OHPs)have drawn the attention of many researchers owing to their astonishing and unique optoelectronic *** have been extensively used for photovoltaic applications,achieving higher than 26%power conversion efficiency to *** materials have potential to be deployed for many other applications beyond photovoltaics like photodetectors,sensors,light-emitting diodes(LeDs),and *** address the looming challenge of Moore’s law and the Von Neumann bottleneck,many new technologies regarding the computation of architectures and storage of information are being extensively *** the discovery of the memristor as a fourth component of the circuit,many materials are explored for memristive ***,researchers have advanced the exploration of OHPs for memristive *** materials possess promising memristive properties and various kinds of halide perovskites have been used for different applications that are not only limited to data storage but expand towards artificial synapses,and neuromorphic *** we summarize the recent advancements of OHPs for memristive applications,their unique electronic properties,fabrication of materials,and current progress in this field with some future perspectives and outlooks.

关键词： organic-inorganic halide perovskites resistive switching memristors

Advancement in QDs for optoelectronic applications and beyond

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Nano Research 2024年第12期17卷 10426-10445页

作者： Memoona Qammar Max J.H.Tan Pengbo Ding Jianchao Ge Yinthai Chan jonathan e.halpert Department of Chemistry Hong Kong University of Science and Technology(HKUST)Hong Kong 999077China Department of Chemistry Northwestern UniversityEvanstonIllinois 60208USA Cosmic Discovery Sdn Bhd 10 Jalan Wawasan 3/KU7Sungai Kapar Indah42200 KlangSelangorMalaysia

This review focuses on the history and current state of the art optoelectronic applications of quantum dots involving light *** focus mainly on three areas of commercial,or potential commercial interest,including quantum dot light emitting devices(QLeDs,sometimes called QD-LeDs),lasing applications,and quantum computing *** main connection between these areas is the development of the science and engineering needed to achieve electrical excitation of the quantum dot in an optoelectronic device in order to achieve emission with characteristics particularly suited to the application in *** to the special physics of quantum dots,these materials are particularly well suited for both existing commercial applications,and potentially for future applications,such as single photon sources,spin cubits,or polarized *** conclude with an analysis of the future prospects for these exciting *** 30 years of progress since the Nobel Prize winning work on monodisperse samples of QDs,our goal is to highlight the current start of the art,discuss the current issues for each technology,and suggest future goals for the next 30 years for quantum dot research.

关键词： quantum dots quantum confinement optoelectronic properties color purity lasing quantum coherence quantum computing

How do molecular interactions affect fluorescence behavior of AIegens in solution and aggregate states?

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Science China Chemistry 2022年第1期65卷 135-144页

作者： Ying Yu Hao Xing Zhicong Zhou Junkai Liu Herman H-YSung Ian D.Williams jonathan e.halpert Zheng Zhao Ben Zhong Tang Department of Chemistry the Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionDepartment of Chemical and Biomedical EngineeringInstitute for Advanced Studyand Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Shenzhen Institute of Molecular Aggregate Science and engineering School of Science and EngineeringChinese University of Hong KongShenzhenGuangdong518172China Department of chemistry The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina AIe Institute Guangzhou Development DistrictHuangpuGuangzhou 510530China

Molecular interactions are crucial in diverse fields of protein folding,material science,nanotechnology,and life *** mounting experimental research controls luminescent behavior by adjusting molecular interactions in light-emitting materials,it remains elusive to correlate microscopic molecular interactions with macroscopic luminescent behavior ***,we synthesized three red luminogens with subtle structural variation and investigated the influence of molecular interactions on their luminescent behavior in solution and aggregate *** results indicate that strongπ-πand D-A interactions in both dilute solution(between luminogen and solvent molecules)and aggregate(between luminogens)states cause the redshift in emission,while weak interactions(e.g.,Van der Waals,C–H…π,and C–H…F interactions)enhance the quantum *** work provides a thoughtful investigation into the complicated influence of various molecular interactions on luminescent behavior.

关键词： molecular interactions fluorescence behaviors AIegens aggregates

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Formation of efficient dye-sensitized solar cells by introducing an interfacial layer of hierarchically ordered macro-mesoporous TiO_2 film

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Science China Chemistry 2011年第6期54卷 930-935页

作者： halpert jonathan e State Key Laboratory of Multi-phase Complex Systems Institute of Process engineering Chinese Academy of Sciences

Hierarchically ordered macro-mesoporous TiO2 films (Ti-Ma-Me) were fabricated on fluorine-doped tin oxide (FTO) substrates through the confinement self-assembly method. The prepared Ti-Ma-Me possesses periodically ordered structure and a large specific surface area, which was applied as an interfacial layer between the nanocrystalline TiO2 film (P25-TiO2) and FTO electrode in the dye-sensitized solar cell (DSSC). The introduction of a Ti-Ma-Me interfacial layer increased the shortcircuit current density (Jsc) from 7.49 to 10.65 mA/cm2 and the open-circuit voltage (Voc) from 0.65 to 0.70 V as the result of its improved light harvesting efficiency by allowing for the high roughness factor and enhanced multiple internal reflection or scattering as well as reducing the back-transport reaction by blocking direct contact between the electrolyte and FTO electrode. Therefore, the photovoltaic conversion efficiency (η) was improved by 83% from 3.04% to 5.55%, as compared to a device using a bare P25 TiO2 photoanode.

关键词： dye-sensitized solar cells hierarchical ordered macro-mesoporous photoanode

Clinical variability and molecular heterogeneity inprostate cancer

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Asian Journal of Andrology 2016年第4期18卷 543-548页

作者： jonathan Shoag Christopher e Barbieri Department of Urology NewYork-Presbyterian Hospital Weill Cornell Medical College New York USA Sandra and edward Meyer Cancer Center Weill Cornell Medica College New York USA.

Prostate cancer is a clinically heterogeneous disease, with some men having indolent disease that can safely be observed, while others have aggressive, lethal disease. Over the past decade, researchers have begun to unravel some of the genomic heterogeneity that contributes to these varying clinical phenotypes. Distinct molecular sub-classes of prostate cancer have been identified, and the uniqueness of these sub-classes has been leveraged to predict clinical outcomes, design novel biomarkers for prostate cancer diagnosis, and develop novel therapeutics. Recent work has also elucidated the temporal and spatial heterogeneity of prostate cancer, helping us understand disease pathogenesis, response to therapy, and progression. New genomic techniques have provided us with a window into the remarkable clinical and genomic heterogeneity of prostate cancer, and this new perspective will increasingly impact patient care.

关键词： cell biology eRG genomics molecular heterogeneity prostate cancer sequencing serine peptidase inhibitor, Kazaltype 1 SPOP tumor profiling

Determination of future land use changes using remote sensing imagery and artificial neural network algorithm:A case study of Davao City,Philippines

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Artificial Intelligence in Geosciences 2023年第1期4卷 111-118页

作者： Cristina e.Dumdumaya jonathan Salar Cabrera College of Information and Computing University of Southeastern PhilippinesBrgy.ObreroDavao CityPhilippines Faculty of Computing Data SciencesEngineering and TechnologyDavao Oriental State UniversityMati CityDavao Oriental8200Philippines

Land use and land cover(LULC)changes refer to alterations in land use or physical *** changes can be caused by human activities,such as urbanization,agriculture,and resource extraction,as well as natural phenomena,for example,erosion and climate *** changes significantly impact ecosystem services,biodiversity,and human *** this study,LULC changes in Davao City,Philippines,were simulated,predicted,and projected using a multilayer perception artificial neural network(MLP-ANN)*** MLP-ANN model was employed to analyze the impact of elevation and proximity to road networks(i.e.,exploratory maps)on changes in LULC from 2017 to *** predicted 2021 LULC map shows a high correlation to the actual LULC map of 2021,with a kappa index of 0.91 and a 96.68%*** MLP-ANN model was applied to project LULC changes in the future(i.e.,2030 and 2050).The results suggest that in 2030,the built-up area and trees are increasing by 4.50%and 2.31%,***,water will decrease by up to 0.34%,and crops is about to decrease by approximately 3.25%.In the year 2050,the built-up area will continue to increase to 6.89%,while water and crops will decrease by 0.53%and 3.32%,***,the results show that anthropogenic activities influence the land’s ***,the study illustrates how machine learning models can generate a reliable future scenario of land usage changes.

关键词： LULC Artificial neural network Remote sensing Land use land cover prediction Multilayer perception Philippines

How China's Holdings of Foreign Reserves Affect the Value of the US Dollar in europe and Asia

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China & World economy 2010年第3期18卷 24-39页

作者： jonathan e. Leightner Johns Hopkins University Hopkins-Nanjing Center Augusta State University

By January 2009, China held almost US$2tn in foreign reserves. The present paper estimates the marginal effect of China changing its holdings offoreign reserves on the value of the US dollar in europe and dsia. Because using traditional techniques to find this estimate would be inappropriate due to severe problems resulting from omitted variables, the present paper uses a new approach, bidirectional-reiterative trucated projected least squares, that has been proven to minimize problems associated with omitted variables. It is found that if China would sell 1 percent of its foreign reserves, then the value of the US dollar would fall by 0.44 percent. With such a large effect, China has an incentive to either not sell arty of its US dollar reserves or sell all of its US dollar reserves.

关键词： exchange rates China foreign reserves omitted variables

Non-exercise estimated cardiorespiratory fitness and cancer incidence:The NIH-AARP diet and health study

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Journal of Sport and Health Science 2023年第6期12卷 739-746页

作者： Baruch Vainshelboim jonathan Myers Charles eMatthews Center for Tobacco Research Division of Medical OncologyDepartment of Internal MedicineThe Ohio State UniversityColumbusOH 43214USA Cardiology Division Veterans Affairs Palo Alto Health Care System/Stanford UniversityPalo AltoCA 94304USA Metabolic epidemiology Branch Division of Cancer Epidemiology and GeneticsNational Cancer InstituteRockvilleMD 20850USA

Background Non-exercise estimated cardiorespiratory fitness(Nee-CRF)has been shown to be associated with mortality,although its association with cancer incidence is *** study aimed to assess the prospective association between Nee-CRF and cancer incidence in a large cohort of men and *** The National Institutes of Health-American Association of Retired Persons diet and health study is a prospective cohort that included 402,548 participants aged 50–71 years who were free from cancer at baseline(1995–1996)(men(n=238,835)and women(n=163,713))and were followed until December 31,*** exposure variable was Nee-CRF expressed in metabolic ***-CRF was estimated using a validated equation of self-reported predictors on demographics and lifestyle behaviors derived from baseline *** outcomes were total cancer incidence and incidence of prostate,breast,lung,and colorectal *** proportional hazards models were analyzed for the association between Nee-CRF and cancer incidence outcomes adjusted for established cancer risk *** During 13.7±3.2 years of follow-up(mean±SD),64,344 men and 31,315 women developed a new *** every 1-metabolic equivalent higher Nee-CRF,the hazard ratios and 95%confidence intervals(95%CIs)were 0.96(95%CI:0.94–0.97)and 0.88(95%CI:0.84–0.92)of total and colorectal cancer incidence among men,and 0.95(95%CI:0.93–0.97)and 0.94(95%CI:0.91–0.97)of total and breast cancer incidence among women,respectively(all pee-CRF was not associated with incidence of prostate and lung cancers in men or colorectal and lung cancers in *** These results suggest that higher CRF levels,as assessed by the applied non-exercise estimated method,may provide preventive benefits against the development of cancer,while low CRF could potentially serve as a modifiable cancer risk *** Nee-CRF into screening paradigms and referring low-fit individuals to improve CRF could complemen

关键词： Aerobic capacity Breast cancer Cancer risk Colorectal cancer VO_(2max)

Microfluidic bacterial traps for simultaneous fluorescence and atomic force microscopy

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Nano Research 2017年第11期10卷 3896-3908页

作者： Oliver Peric Melanie Hannebelle jonathan D. Adams Georg e. Fantner Laboratory for Bio-and Nano-Instrumentation Institute of Bioengineering School of Engineering EPFL 1015 Lausanne Switzerland

The atomic force microscope has become an established research tool for imaging microorganisms with unprecedented ***,its use in microbiology has been limited by the difficulty of proper bacterial ***,we have developed a microfluidic device that solves the issue of bacterial immobilization for atomic force microscopy under physiological *** device is able to rapidly immobilize bacteria in well-defined positions and subsequently release the cells for quick sample *** developed device also allows simultaneous fluorescence analysis to assess the bacterial viability during atomic force microscope *** demonstrated the potential of our approach for the immobilization of rod-shaped escherichia coli and Bacillus *** our device,we observed buffer-dependent morphological changes of the bacterial envelope mediated by the antimicrobial peptide *** approach to bacterial immobilization makes sample preparation much simpler and more reliable,thereby accelerating atomic force microscopy studies at the single-cell level.

关键词： atomic force microscope (AFM) microfabrication microfluidics microbiology correlative microscopy physical immobilization