检索结果-南通市图书馆

Ultra-low concentration of total organic carbon in ultrapure water using ion-exchange resin embedding silanized magnetic nanoparticles

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 2020年第6期32卷 11-17页

作者： Jung joon lee Jihyeon Park Bo-Hyun Kim Sunjong lee Department of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwon 16419South Korea Korea Institute of Industrial Technology 89 Yangdaegiro-gilIpjang-myeonCheonan-si 31056South Korea

Regeneration of pure water is an important issue not only for the healthy life but also for the fine control of precise processes in various *** important issue in ultrahigh purified water is to reduce the amount of total organic carbon(TOC).Herein,we introduce a new approach to reduce the TOC using the surface silanized nanoparticles,in which the magnetic nanoparticles(mNPs)are silanized and then complexed with ion exchange resin(IER)*** Fe3O4 mNPs are surface modified by using high concentrated vinyltrimethoxysilane(VTMS)and then adhered on the surface of IER *** surface modified mNPs have a thick-shell of polysiloxane layer varying from 5 to 22 nm depending on the amount of VTMS used,which leads the significant increase of specific surface *** IER beads embedding VTMS-silanized mNPs achieves about 7μg/L of the TOC level in ultrapure water system,which is two orders less than 228μg/L of the feeding water and one order less than 96μg/L from the system using pristine IER *** result is mainly attributed to the polysiloxane layer forming broccoli-like surface structure and some part by the vinyl group of VTMS exposed to the amines in the water.

关键词： Total organic carbon Ultrapure water Magnetic nanoparticle Ion-exchange resin Hybrid structure

Piezoelectrically Actuated Biomimetic Self-Contained Quadruped Bounding Robot

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2009年第1期6卷 29-36页

作者： Thanhtam ho Sangyoon lee Department of Mechanical Design and Production Engineering Konkuk UniversitySeoul 143-701Korea

This paper presents the development of a mesoscale self-contained quadruped mobile robot that employs two pieces of piezocomposite actuators for the bounding *** design of the robot leg is inspired by legged insects and animals, and the biomimetic concept is implemented in the robot in a simplified form,such that each leg of the robot has only one degree of *** lack of degree of freedom is compensated by a slope of the robot frame relative to the horizontal *** the implementation of the self-contained mobile robot,a small power supply circuit is designed and installed on the *** results show that the robot can locomote at about 50 mm·s^(-1)with the circuit on board,which can be considered as a significant step toward the goal of building an autonomous legged robot actuated by piezoelectric actuators.

关键词： piezoelectric actuator quadruped robot bounding locomotion self-contained legged robot

Arabidopsis TOR signaling is essential forsugar-regulated callus formation

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2017年第10期59卷 742-746页

作者： Kyounghee lee Pil joon Seo Department of Biological Sciences Sungkyunkwan University Suwon 16419 Korea

Dedifferentiation is a remarkable process that produces pluripotent stem cells from differentiated somatic cells to ensure developmental *** have evolved the ability of cellular dedifferentiation,and signaling cascades related to auxin and cytokinin-dependent callus formation have been extensively ***,the molecular mechanism underlying sugar-dependent callus format:ion remains ***,we show that sugar-dependent callus formation is mainly regulated by the TOR-E;Fa module in ***-activated TOR kinase phosphorylates and stabilizes E;Fa proteins to transcriptionally activate S-phase genes during callus *** parallel,E;Fa is transcriptionally regulated by the ARF-LBD transcription ***:i-layered regulation of E;Fa by sugar and auxin is likely to shape balanced cellular dedifferentiation capability in Arabidopsis.

关键词： TOR Figure CIM LBD

how the physical inactivity is affected by social-, economic- and physical-environmental factors: an exploratory study using the machine learning approach

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2023年第1期16卷 2503-2521页

作者： Kangjae lee Jue Wang joon Heo Department of Location-Based Information System Kyungpook National UniversitySangju-siGyeongsangbukdoRepublic of Korea Department of Geography Geomatics and EnvironmentUniversity of Toronto MississaugaMississaugaCanada Department of Civil and Environmental Engineering Yonsei UniversitySeoulRepublic of Korea

Previous studies have utilized regression models to investigate the impact of environmental factors on physical ***,such approaches are inadequate for data-driven analysis seeking to identify robust associations from the intricate and multi-variable interactions between physical activity and environmental *** the emergence of the concept of the exposome,which encompasses the totality of exposures,this paper explores machine learning models for predicting the percentage of physical inactivity in ***,while considering 28 social-,economic-,and physical-environmental *** aim of this study is to address the research gap and gain insight into the complex associations between environmental exposures and physical *** machine learning models were tested,and the performances were compared to select the best classifier for further *** study used data from the Behavioral Risk Factor Surveillance System(BRFSS)of the Centers for Disease Control and *** mean population of all counties was 102,841,and the mean percentage of population below 18 years was 22.3%.The partial dependence plot analysis indicated that only one feature–bachelor’s degree–exhibited a close-to-linear relationship with physical ***-vehicle crash death rate and mean temperature showed nonlinear and non-monotonic relationships with the predicted percentage of physical inactivity.

关键词： Physical inactivity environmental effects machine learning GIS

Blockade of PD-L1/PD-1 signaling promotes osteo-/odontogenic differentiation through Ras activation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Oral Science 2022年第2期14卷 164-173页

作者： So Mi Jeon Je Sun Lim Su Hwan Park Hyung joon Kim Hyung-Ryong Kim Jong-ho lee Department of Health Sciences The Graduate School of Dong-A UniversityBusanRepublic of Korea Department of Oral Physiology Periodontal Diseases Signaling Network Research CenterDental and Life Science InstituteSchool of DentistryPusan National UniversityYangsanRepublic of Korea Department of Pharmacology College of DentistryJeonbuk National UniversityJeonjuRepublic of Korea Department of Biomedical Sciences Dong-A UniversityBusanRepublic of Korea

The programmed cell death ligand 1(PD-L1)and its receptor programmed cell death 1(PD-1)deliver inhibitory signals to regulate immunological tolerance during immune-mediated ***,the role of PD-1 signaling and its blockade effect on human dental pulp stem cells(h DPSCs)differentiation into the osteo-/odontogenic lineage remain *** show here that PD-L1 expression,but not PD-1,is downregulated during osteo-/odontogenic differentiation of h ***,PD-L1/PD-1 signaling has been shown to negatively regulate the osteo-/odontogenic differentiation of h ***,depletion of either PD-L1 or PD-1 expression increased ERK and AKT phosphorylation levels through the upregulation of Ras enzyme activity,which plays a pivotal role during h DPSCs osteo-/odontogenic *** with nivolumab(a human anti-PD-1 monoclonal antibody),which targets PD-1 to prevent PD-L1 binding,successfully enhanced osteo-/odontogenic differentiation of h DPSCs through enhanced Ras activity-mediated phosphorylation of ERK and *** findings underscore that downregulation of PD-L1 expression accompanies during osteo-/odontogenic differentiation,and h DPSCs-intrinsic PD-1 signaling inhibits osteo-/odontogenic *** findings provide a significant basis that PD-1 blockade could be effective immunotherapeutic strategies in h DPSCs-mediated dental pulp regeneration.

关键词： death finding monoclonal

Pancreatic hardness: Correlation of surgeon's palpation, durometer measurement and preoperative magnetic resonance imaging features

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第11期23卷 2044-2051页

作者： Tae ho hong joon-Il Choi Michael Yong Park Sung Eun Rha Young joon lee Young Kyoung You Moon Hyung Choi Department of Surgery Seoul St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea Cancer Research Institute Seoul St.Mary’s HospitalCollege of Medicinethe Catholic University of Korea Department of Radiology Seoul St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea

AIM To evaluate the correlation between subjective assessments of pancreatic hardness based on the palpation, objective measurements using a durometer, and magnetic resonance imaging(MRI) findings for assessing pancreatic *** Eighty-three patients undergoing pancreatectomies were enrolled. An experienced surgeon subjectively evaluated the pancreatic hardness in the surgical field by palpation. The pancreatic hardness was also objectivelyevaluated using a durometer. Preoperative MRI findings were evaluated by a radiologist in terms of the apparent diffusion coefficient(ADC) values, the relative signal intensity decrease(RSID) of the pancreatic parenchyma, and the diameter of the pancreatic parenchyma and duct. Durometer measurement results, ADC values, RSID, pancreatic duct and parenchyma diameters, and the ratio of the diameters of the duct and parenchyma were compared between pancreases judged to be soft or hard pancreas on the palpation. A correlation analysis was also performed between the durometer and MRI *** The palpation assessment classified 44 patients as having a soft pancreas and 39 patients as having a hard pancreas. ADC values were significantly lower in the hard pancreas group. The ductal diameter and duct-to-pancreas ratio were significantly higher in the hard pancreas group. For durometer measurements, a correlation analysis showed a positive correlation with the ductal diameter and the duct-to-pancreas ratio and a negative correlation with ADC values. CONCLUSION Hard pancreases showed lower ADC values, a wider pancreatic duct diameter and a higher duct-to-pancreas ratio than soft pancreases. Additionally, the ADC values, diameter of the pancreatic duct and duct-to-pancreas ratio were closely correlated with the durometer results.

关键词： Pancreas Texture Hardness Magnetic resonance imaging Fistula

Identifying the relationships between subsurface absorber defects and the characteristics of kesterite solar cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Energy 2023年第8期5卷 42-54页

作者： Dae-ho Son Dong-Hwan Jeon Dae-Hwan Kim Jin-Kyu Kang Shi-joon Sung Jaebaek lee Taeseon lee Enkhjargal Enkhbayar Junho Kim Kee-Jeong Yang Division of Energy Technology DGISTDaeguRepublic of Korea Research Center for Thin Film Solar Cells DGISTDaeguRepublic of Korea Department of Physics Incheon National UniversityIncheonRepublic of Korea

Understanding the defect characteristics that occur near the space-charge regions(SCRs)of kesterite(CZTSSe)solar cells is important because the recombination loss at the CZTSSe/CdS interface is considered the main cause of their low *** surfaces with different elemental compositions were formed without polishing(C00)and with polishing for 20 s(C20)and 60 s(C60).For C60,a specific region near the SCR was excessively Cu-rich and Zn-poor compared to C00 and *** charged defects formed where the elemental variation was *** the main deep acceptor defect energy level(E_(a2))near the SCR increased,the efficiency,open-circuit voltage deficit,and current density degraded,and this phenomenon was especially rapid for large E_(a2) *** the E_(a2) near the SCR became deep,the carrier diffusion length decreased more for the CZTSSe solar cells with a low carrier mobility than for the CuInGaSe_(2)(CIGSe)solar *** large amplitude of the electrostatic potential fluctuation in the CZTSSe solar cells induced a high carrier recombination and a short carrier ***,the properties of the CZTSSe solar cells were more strongly degraded by defects with deep energy levels near the SCR than those of the CIGSe solar cells.

关键词： defect density defect energy level elemental variation kesterite space charge region

A metallic anti-biofouling surface with a hierarchical topography containing nanostructures on curved micro-riblets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2022年第1期8卷 83-96页

作者： Taekyung Kim Sunmok Kwon Jeehyeon lee joon Sang lee Shinill Kang National Center for Optically-assisted high precision Mechanical Systems Yonsei UniversitySeoul 03722Korea School of Mechanical Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Korea

Metallic surface finishes have been used in the anti-biofouling,but it is very difficult to produce surfaces with hierarchically ordered *** the present study,anti-biofouling metallic surfaces with nanostructures superimposed on curved micro-riblets were produced via top-down *** to the attachment theory,these surfaces feature few attachment points for organisms,the nanostructures prevent the attachment of bacteria and algal zoospores,while the micro-riblets prohibit the settlement of *** oxidation was performed to induce *** forms a hydration layer on the surface,which physically blocks foulant adsorption along with the anti-biofouling *** characterized the surfaces via scanning electron and atomic force microscopy,contact-angle measurement,and wear-resistance *** contact angle of the hierarchical structures was less than 1°.Laboratory settlement assays verified that bacterial attachment was dramatically reduced by the nanostructures and/or the hydration layer,attributable to *** micro-riblets prohibited the settlement of *** 77 days of static immersion in the sea during summer,the metallic surface showed significantly less biofouling compared to a surface painted with an anticorrosive coating.

关键词： Anti-biofouling Superhydrophilic Hierarchical topography Metallic engineered surface Nanoimprinting,static immersion test,field trials

Catalysts for electrochemical ammonia oxidation:Trend,challenge,and promise

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 Materials 2022年第12期65卷 3334-3352页

作者： Sol A lee Mi Gyoung lee ho Won Jang Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Electrical and Computer Engineering University of TorontoToronto M5S 3G4OntarioCanada Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea

Developing sustainable and clean energy technology is critial to address the current energy and environmental *** an energy carrier,hydrogen has been getting attention due to its abundance,high energy density,and zero carbon *** to the difficulty of hydrogen storage and transport,the electro-oxidation of ammonia shows great potential for renewable energy since it satisfies both energy supply and environmental protection as a carbon-free fuel with high hydrogen ***,ammonia electro-oxidation is a sluggish reaction and shows low *** the complicated mechanism and intermediates is conducive to developing efficient electrocatalysts with high catalytic activity and *** review begins with the ammonia oxidation technologies and their *** two typical mechanisms for ammonia electro-oxidation,Oswin-Salomon mechanism and Gerischer-Mauerer mechanism,are discussed,and attention to the poisoning species is ***,the electrocatalysts for ammonia reaction are classified into Pt-based catalysts and non-noble metal-based catalysts,and their performances are reviewed with various *** on the progress on the electrochemical ammonia oxidation catalysts,the challenges and future insight on ammonia oxidation reaction are discussed and proposed.

关键词： NH3 oxidation reaction electrocatalysts green hydrogen