检索结果-南通市图书馆

Influence of operational parameters on the photocatalytic performance of DE-NOx process Via MIL-101(Fe)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2018年第6期28卷 689-695页

作者： hoang Phuc Nguyen tae ho Kim Soo Wohn Lee Research Center for Eco Multi-Functional Nano Materials Sun Moon University Department of Environmental & Bio-Chemical Engineering Sun Moon University

Metal organic framework(MOF)has been paid great attention as a potential candidate for various applications in the field of energy and environment,particularly in air *** various MOFs,MIL-101(Fe) represents an interesting material possessing many advantages,including the ease of fabrication,high porosity,high specific surface area with open metal sites,making it a promising material in the field of harmful gas *** these advantages,MIL-101(Fe) was synthesized by facile microwave-solvothermal method and applied as a photocatalyst for the degradation of *** de-NOxefficiency of the synthesized powder was evaluated with respect to various operating parameters including substrates,sample doses,light spectrum and light intensity,initial NO concentration,and relative *** results have shown that the efficiency of NOxphotocatalytic degradation reaches to 77%under solar irradiation via 0.1 g of MIL-101(Fe) with optimum condition of reaction,(alumina substrate,350 ppb of initial NO concentration,40–50%of relative humidity).Then this work provides the optimum condition for the efficient photocatalytic degradation of NOx.

关键词： Metal-organic framework MIL-101 Gaseous pollutant NOx emission Photocatalyst

Effect of Fe_2P in LiFePO_4/Fe_2P composite on electrochemical properties synthesized by MA and control of heat condition

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2006年第Z2期25卷 179-183页

作者： park Jong Suk LEE Kyung tae LEE Kyung Sub Department of Material Science and Engineering Hanyang University Seoul 133-731 Korea

In order to control the size and distribution of the high conductive Fe2P in LiFePO4/Fe2P composite, two different cooling rates (Fast: 15 ℃·min-1, Slow: 2 ℃·min-1) were employed after mechanical alloying. The discharge capacity of the fast cooled was 83 mAh·g-1 and the slow cooled 121 mAh·g-1. The particle size of the synthesized powder was examined by transmission electron microscopy and distribution of Fe2P was characterized using scanning electron microscopy (SEM). In addition, two-step heat treatment was carried out for better distribution of Fe2P. X-ray diffraction (XRD) and Rietveld refinement reveal that LiFePO4/Fe2P composite consists of 95.77% LiFePO4 and 4.33% of Fe2P.

关键词： LiFePO4/Fe2P composite mechanical alloying heat treatment discharge capacity

Endoscopic diverticulotomy with an isolated-tip needle-knife papillotome (Iso-Tome) and a fitted overtube for the treatment of a Killian-Jamieson diverticulum

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第42期14卷 6589-6592页

作者： Chang Kyun Lee Il-Kwun Chung Ji-Young park tae hoon Lee Suck-ho Lee Sang-Heum park hong-Soo Kim Sun-Joo Kim Division of Gastroenterology Department of Internal Medicine Soonchunhyang University College of Medicine Cheonan Hospital Cheonan Choongnam 330-721 South Korea

A Killian-Jamieson diverticulum （KID） is an unfamiliar and rare cervical esophageal diverticulum. This diverticulum originates on the anterolateral wall of the proximal cervical esophagus through a muscular gap （the Killian-Jamieson space） below the cricopharyngeal muscle and lateral to the longitudinal muscle of the esophagus. To date, only surgical treatment has been recommended for a symptomatic KJD due to its close proximity to the recurrent laryngeal nerve and the concern of possible nerve injury. Recently, traditional open surgery for a symptomatic KJD is being challenged by the development of new endoscopic techniques and devices. We present here a case of a symptomatic KID that was successfully treated with the flexible endoscopic diverticulotomy using two new devices. An isolated-tip needle-knife papillotome （Iso-Tome） was used for the dissection of the tissue bridge of the diverticulum. And a flexible overtube with a modified distal end （a fitted overtube） was used for adequate visualization of the tissue bridge of the diverticulum and protection of the surrounding tissue during dissection of the tissue bridge. Our successful experience suggests that the flexible endoscopic diverticulotomy with the use of appropriate endoscopicdevices can be a safe and effective method for the treatment of a symptomatic KJD.

关键词： Esophagus Diverticulum Killian-Jamieson diverticulum Endoscopy Diverticulotomy

Mooring Tension and Motion Characteristics of A Submerged Fish Reef with Net in Waves and Currents Using Numerical Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Ocean Engineering 2012年第2期26卷 261-276页

作者： tae ho Kim David W.Fredriksson Judson DeCewc School of Marine Technology Chonnam National University Department of Naval Architecture and Ocean Engineering United States Naval Academy Annapolis Center for Ocean Engineering University of New Hampshire

A numerical model was used to analyze the motion response and mooring tension of a submerged fish reef system. The system included a net attached to a rigid structure suspended up from the bottom with a single, high tension mooring by fixed flotation. The analysis was performed by using a Morison equation type finite element model configured with truss elements. Input forcing parameters into the model consisted of both regular and irregular waves, with and without a steady current. Heave, surge and pitch dynamic calculations of the reef structure were made. Tension response results of the attached mooring line were also computed. Results were analyzed in both the time and frequency domain in which appropriate, linear transfer functions were calculated. The influence of the current was more evident in the tension and heave motion response data. This is most likely the result of the large buoyancy characteristics of the reef structure and the length of the mooting cable. Maximum mooting component tension was found to be 13.9 kN and occurred when the reef was subjected to irregular waves with a co-linear current of 1.0 m/s velocity. The results also showed that the system had little damping （in heave） with damped natural periods of 2.8 s. This combination of system characteristics promotes a possible resonating situation in typical open sea conditions with similar wave periods.

关键词： floating fish reef fish aggregating device numerical model waves and currents net structure

Grasper type scissors for endoscopic submucosal dissection of gastric epithelial neoplasia

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第37期19卷 6221-6227页

作者： Woo-Chul Chung Byung-Wook Kim Chul-Hyun Lim tae-ho Kim Jae-Myung park Joon-Sung Kim Division of Gastroenterology Department of Internal MedicineSuwon St.Vincent’s HospitalThe Catholic University of Korea Division of Gastroenterology Department of Internal MedicineIncheon St.Mary’s HospitalThe Catholic University of Korea Division of Gastroenterology Department of Internal MedicineSeoul St.Mary’s HospitalThe Catholic University of Korea Division of Gastroenterology Department of Internal MedicineBucheon St.Mary’s HospitalThe Catholic University of Korea

AIM:To evaluate the efficacy and safety of grasper type scissors(GTS)for endoscopic submucosal dissection(ESD)of gastric epithelial ***:The study was performed by 4 endoscopists in 4 institutions affiliated to The Catholic University of *** was performed in 76 consecutive patients with gastric epithelial neoplasia by using the GTS(37 patients)or the hook knife plus coagrasper(HKC)(39 patients).The complete resection rate,complication rate,total time elapsed and elapsed time per square centimeter of the dissected specimen were analyzed between the GTS and HKC ***:The mean age of the GTS group was 62.3±11.4 years and mean age of the HKC group was 65.6±10.1 *** adenocarcinoma was found in32.4%in the GTS group and 33.3%in the HKC *** procedures were performed without interruption in every case in both *** en bloc resection rates of both groups were 100%.The total time elapsed during the procedure was 44.54±21.72 min in the GTS group and 43.77±21.84 min in the HKC group(P=0.88)and the time elapsed per square centimeter of the resected lesion was 7.53±6.35 min/cm2in the GTS group and 6.92±5.93 min/cm2in the HKC group(P=0.66).The overall complication rate was not significantly different between the two ***:GTS is a safe and effective device for ESD compared with *** can be performed with GTS alone,which can reduce the costs for ESD.

关键词： Gastric epithelial neoplasia Endoscopic submucosal dissection Grasper type scissors hook knife Coagrasper

Single-step Preparation of Nano-homogeneous NiO/YSZ Composite Anode for Solid Oxide Fuel 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

Nano-Micro Letters 2013年第2期5卷 111-116页

作者： Jung-hoon Song Mi Young park Hye Won park Hyung-tae Lim Research Institute of Industrial Science and Technology (RIST) Fuel Cell Project Changwon National University School of Nano & Advanced Materials Engineering

homogeneous co-precipitation and hydrothermal treatment were used to prepare nano- and highly dispersed Ni O/YSZ(yttria-stabilized zirconia) composite powders. Composite powders of size less than 100 nm were successfully prepared. This process did not require separate sintering of the YSZ and Ni O to be used as the raw materials for solid oxide fuel cells. The performance of a cell fabricated using the new powders(*** density ~0.87 W/cm^2) was higher than that of a cell fabricated using conventional powders(max. power density ~0.73 W/cm^2). Co-precipitation and hydrothermal treatment proved to be very effective processes for reducing cell production costs as well as improving cell performance.

关键词： Fuel cells Powder processing Electrochemistry Hydrothermal process NiO/YSZ composite anode

Comprehensive analysis of two-dimensional charge transport mechanism in thin-film transistors based on random networks of single-wall carbon nanotubes using transient measurements

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第2期15卷 1524-1531页

作者： Hyeonwoo Shin Sang-Joon park Byeong-Cheol Kang tae-Jun Ha Department of Electrical Engineering and Computer Science Inter-university Semiconductor Research CenterSeoul National UniversitySeoul 08826Korea Department of Electronic Materials Engineering Kwangwoon UniversitySeoul 01897Korea

Understanding charge transport mechanisms in thin-film transistors based on random networks of single-wall carbon nanotubes(SWCNT-TFTs)is essential for further advances to improve the potential for various nanoelectronic ***,a comprehensive investigation of the two-dimensional(2D)charge transport mechanism in SWCNT-TFTs is reported by analyzing the temperature-dependent electrical characteristics determined from the direct-current and non-quasi-static transient measurements at 80-300 *** elucidate the time-domain charge transport characteristics of the random networks in the SWCNTs,an empirical equation was derived from a theoretical trapping model,and a carrier velocity distribution was determined from the differentiation of the transient ***,charge trapping and de-trapping in shallow-and deep-traps in SWCNT-TFTs were analyzed by investigating charge transport based on their trapping/de-trapping *** comprehensive analysis of this study provides fundamental insights into the 2D charge transport mechanism in TFTs based on random networks of nanomaterial channels.

关键词： single-wall carbon nanotube random networks two-dimensional(2D)charge transport time-domain transient measurements charge trapping/de-trapping shallow-/deep-traps

Surface-roughened current collectors for anode-free all-solid-state batteries

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 Energy Chemistry 2022年第7期31卷 248-257,I0007页

作者： Donghee Gu Hyoungchul Kim Jong-ho Lee Sangbaek park Energy Materials Research Center Korea Institute of Science and Technology(KIST)Seoul 02792.Republic of Korea School of Civil Environmental and Architectural EngineeringKorea University.Seoul 02841.Republic of Korea Division of Nanoscience and Technology University of Science and Technology(UST)Seoul02792.Republicof Korea Department of Materials Science and Engineering Chungnam National UniversityDaejeon 34134.Republic of Korea

Anode-free all-solid-state batteries(AFASSBs), composed of a fully lithiated cathode and a bare current collector(CC) that eliminates excess lithium, can maximize the energy density(because of a compact cell configuration) and improve the safety of solid-state systems. Although significant progress has been made by modifying CCs in liquid-based anode-free batteries, the role of CCs and the mechanism of Li formation on CCs in AFASSBs are still unexplored. Here, we systematically investigate the effect of the surface roughness of the CCs on the Li plating/stripping behavior in AFASSBs. The results show that the moderately roughened CC substantially improves the Coulombic efficiency and cycle stability of AFASSBs owing to the increased contact points between the solid electrolyte and the roughened CC. In contrast, the excessively roughened CC deteriorates the performance owing to the contact ***, an ex situ interface analysis reveals that the roughened surface of the CC could suppress the interfacial degradation during the Li ion extraction from a sulfide solid electrolyte to a CC. This provides an indication to the origin that hinders the electrochemical performance of AFASSBs. These findings show the potential for the application of surface-engineered CCs in AFASSBs and provide guidelines for designing advanced CCs.

关键词： Anode-free Solid-state batteries Current collectors Surface roughness Li formation

Iron sulfides with dopamine-derived carbon coating as superior performance anodes for sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Nano Research 2019年第10期12卷 2609-2613页

作者： Aihua Jin Seung-ho Yu Jae-Hyuk park Seok Mun Kang Mi-Ju Kim tae-Yeol Jeon Junyoung Mun Yung-Eun Sung Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul 08826Republic of Korea School of Chemical and Biological Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Chemical and Biological Engineering Korea University145 Anatn-roSeongbtik-guSeoul 02841Republic cf Korea Beamline Department Pohang Accelerator Laboratory(PAL)Pohang 37673Republic of Korea Department of Energy and Chemical Engineering Incheon National University12-1Songdo-dong Yeonsu-guIncheon 22012Republic of Korea

High energy ball-milled iron sulfides with thin carb on layer coati ng(BM-FeS/C composites)were prepared by the simple and econo mical ***-milled process,followed by carb on coati ng,reduced the particle size and increased the electrical con *** n employed as sodium-ion battery ano des,BM?F eS/C composites showed extremely high electrochemical performa nee with reversible specific capacity of 589.8 mAh·g^-1 after 100 cycles at a current density of 100 mA·g^-*** also exhibited superior rate capabilities of 375.9 mAh·g^-1 even at 3.2 Ag^1 and 423.6 mAh·g^-1 at 1.5 Ag_1.X-ray absorptio n near edge structure an alysis con firmed the electrochemical pathway for con version reaction of BM-FeS/C composites.

关键词： sodium-ion batteries iron sulfides high energy ball-milling dopamine X-ray absorption near edge structure