检索结果-南通市图书馆

Behavior of CaO and Calcium in pure Magnesium

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 150-154页

作者： HA Seong-Ho LEE Jin-Kyu JO Hyung-Ho JUNG Seung-Boo kim Shae K. Department of Advanced Material Engineering Sungkyunkwan University 300 Chunchun-dong Jangan-gu Suwon Gyunggi-do 440-746 KoreaAdvanced Material Division Korea Institute of Industrial Technology 7-47 Songdo-dong Yeonsu-gu Incheon 406-840 Korea Advanced Material Division Korea Institute of Industrial Technology 7-47 Songdo-dong Yeonsu-gu Incheon 406-840 Korea Department of Advanced Material Engineering Sungkyunkwan University 300 Chunchun-dong Jangan-gu Suwon Gyunggi-do 440-746 Korea

Mg alloys exhibit a number of good properties such as low density, good castability and high specific strength. However, molten Mg and Mg alloys are ignited without the melt protective gases during melting and casting process due to their high reactivity. The purpose of this study is to investigate effects of Ca and CaO on pure Mg through microstructure observation, ignition test and phase analysis. With increasing Ca and CaO contents, the ignition resistance of Ca or CaO added pure Mg is increased and the grains are refined. As results of XRD and EDS, CaO is reduced to Ca in CaO added pure Mg. Mg2Ca phase is formed even in 0.1 wt.%CaO added pure Mg by reduction mechanism, while Mg2Ca phase is formed over 1.35 wt.% Ca added pure Mg.

关键词： Mg CaO ignition resistance Mg2Ca phase

Flexible and disposable paper-based gas sensor using reduced graphene oxide/chitosan composite

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第6期101卷 165-172页

作者： Hyunjun Park Woong kim Sang Won Lee Joohyung Park Gyudo Lee Dae Sung Yoon Wonseok Lee Jinsung Park Department of Control and Instrumentation Engineering Korea UniversitySejong 30019Republic of Korea School of Biomedical Engineering Korea UniversitySeoul 02841Republic of Korea Department of Biotechnology and Bioinformatics Korea UniversitySejong 30019Republic of Korea Department of Electrical Engineering Korea National University of TransportationChungju 27469Republic of Korea

Nitrogen dioxide(NO_(2))is a representative toxicant in air pollution that mostly arises from the exhaust gas released by *** is related to various respiratory diseases such as pneumonia and sudden infant death ***,because the toxicity of nitrogen dioxide is high in overpopulated areas(i.e.,a capital or metropolis),the development of simple,practical,and facile sensors is highly *** work presents a flexible and disposable paper-based NO_(2)sensor based on a reduced graphene oxide/chitosan(r GO/CS)*** synthesized r GO/CS composite can be easily flexed and deformed into various shapes,which are attributed to chitosan molecules that function as a dispersion and reduction agent and support *** addition,this composite can be attached to paper owing to its adhesive property;hence it can be utilized in versatile applications in a disposable *** analyzing the conductive change of the r GO/CS composite when it reacts with NO_(2),we can detect nitrogen dioxide in a concentration range of 0–100 ppm with a detection limit of 1 ***,we performed NO_(2)detection in the exhaust gas released by automobiles using the r GO/CS composite for practical *** results indicated that the r GO/CS composite has the potential to be used in feasible gas sensing as a facile and disposable sensor under various conditions.

关键词： Reduced graphene oxide Chitosan Composite material Nitrogen dioxide Paper-based gas sensor Flexible and disposable sensor

Exophytic inflammatory myofibroblastic tumor of the stomach in an adult woman:A rare cause of hemoperitoneum

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第1期14卷 136-139页

作者： Seong-Heum Park Jong-Han kim Byung Wook Min Tae Jin Song Gil Soo Son Seung Joo kim Sang Woo Lee Hwan-Hoon Chung Ju Han Lee Jun Won Um Department of Surgery Korea University College of Medicine 126-1 5-Ga Anam-Dong Sungbuk-Gu Seoul 136-705 Korea Department of Internal Medicine Korea University College of Medicine 126-1 5-Ga Anam-Dong Sungbuk-Gu Seoul 136-705 Korea Department of Radiology Korea University College of Medicine 126-1 5-Ga Anam-Dong Sungbuk-Gu Seoul 136-705 Korea Department of Pathology Korea University College of Medicine 126-1 5-Ga Anam-Dong Sungbuk-Gu Seoul 136-705 Korea

Inflammatory myofibroblastic tumor （INT） of the stomach in adults is extremely rare, with unpredictable prognosis. We present a 55-year-old woman with a gastric IMT. She experienced sudden abdominal pain 4 d previously. Physical examination showed mild abdominal tenderness in the hypogastrium, but no palpable abnormal abdominal mass. Abdominal CT showed a mass of approximately 8 cm in the gastrocolic ligament. On laparoscopic exploration, unexpected hemoperitoneum of approximately 1.5 L of blood was found, and an exophytic gastric mass of approximately 10 cm, appeared from the anterior wall of the gastric body along the greater curvature. Laparoscopy further showed that non- clotting blood in the abdominal cavity seemed to be from the gastric tumor. After conversion to open surgery for more precise evaluation of the cause of hemoperitoneum and the large friable tumor, gastric wedge resection, including the tumor, was conducted. The final diagnosis was consistent with IMT that originated from the gastric wall.

关键词： Stomach disease Stomach neoplasms Hemoperitoneum Myofibroma Granuloma Plasma cell Stomach surgery

不同肌肉组选择导出模块对组间肌电反复性的影响（英文）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

医用生物力学 2019年第4期34卷 425-433页

作者： Yushin kim Minhee kim Bumchul YOON Sangheon LEE 韩国高等科学技术研究院力学工程系大田韩国高丽大学保健大学院首尔韩国高丽大学医学研究中心康复医学科首尔韩国

目的评价组间肌电反复性对不同肌肉组选择导出模块的影响。方法记录12名参与实验者在自选速度下行走时16块肌肉的肌电图。用组内相关系数评价每个步行周期的肌肉兴奋度和肌肉模块。依据肌肉兴奋度的反复性,区分出3种类型的肌肉组。结果... 详细信息

目的评价组间肌电反复性对不同肌肉组选择导出模块的影响。方法记录12名参与实验者在自选速度下行走时16块肌肉的肌电图。用组内相关系数评价每个步行周期的肌肉兴奋度和肌肉模块。依据肌肉兴奋度的反复性,区分出3种类型的肌肉组。结果可靠肌肉组显示出较高的组内相关系数(>0.4),而全身肌肉组和混合肌肉组显示出较低的组内相关系数(<0.4)。3种类型肌肉组比较,可靠肌肉组分析得出的模块具有最好的反复性,全身肌肉组和混合肌肉组的反复性较低。结论具有较高可靠性的肌肉兴奋性能够得出较一致的模块。得出一致模块的方法非常重要,尤其是在依靠肌肉兴奋性反馈而改变的运动模式中。

关键词：肌肉兴奋度肌电图行走稳定性重复性

Durability of viral response after off-treatment in HBeAg positive chronic hepatitis B

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2012年第43期18卷 6277-6283页

作者： Myeong Jun Song Do Seon Song Hee Yeon kim Sun Hong Yoo Si Hyun Bae Jong Young Choi Seung Kew Yoon Yong-Han Paik June Sung Lee Hyun Woong Lee Hyung Joon kim Departments of Internal Medicine College of Medicine The Catholic University of Korea Seoul 137-040 South Korea Departments of Internal Medicine Samsung Medical Center Sungkyunkwan University School of Medicine Seoul 135-710 South Korea Departments of Internal Medicine College of Medicine Inje University Ilsan Paik Hospital of The Korea Goyang-si 411-706 South Korea Departments of Internal Medicine College of Medicine The Chung-Ang University of Korea Seoul 156-755 South Korea

AIM:To evaluate the durability in hepatitis B e antigen (HBeAg) positive chronic hepatitis B patients who discontinued antiviral treatment. METHODS:A total of 48 HBeAg positive chronic hepatitis B patients who were administered nucleoside analogues and maintained virological response for ≥ 6 mo [hepatitis B virus (HBV) DNA 104 copies/mL after HBeAg seroconversion with previously undetectable HBV-DNA level. RESULTS:During the median follow-up period of 18.2 mo (range:5.1-47.5 mo) after cessation of antiviral treatment, the cumulative serological recurrence rate was 15 % at 12 mo. The median duration between the cessation of antiviral treatment and serologic recurrence was 7.2 mo (range:1.2-10.9 mo). Of the 48 patients with HBeAg positive chronic hepatitis, 20 (41.6%) showed virological recurrence. The cumulative virologic recurrence rates at 12 mo after discontinuing the antiviral agent were 41%. The median duration between off-treatment and virologic recurrence was 7.6 mo (range:4.3-27.1 mo). The mean age of the virological recurrence group was older than that of the non-recurrence group (46.7 ± 12.1 years vs 38.8 ± 12.7 years, respectively; P = 0.022). Age (> 40 years) and the duration of consolidation treatment (≥ 15 mo) were significant predictive factors for offtreatment durability in the multivariate analysis [P = 0.049, re

关键词： Durability Seroconversion Chronic hepatitis B Hepatitis B e antigen positive Recurrence Consolidation

Effects of Ginkgo biloba extracts with mirodenafil on the relaxation of corpus cavernosal smooth muscle and the potassium channel activity of corporal smooth muscle 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

Asian Journal of Andrology 2011年第5期13卷 742-746页

作者： Jung Jun kim Deok Hyun Han Soo Hyun Lim Tae Hun kim Mee Ree Chae Kyung Jin Chung Sung Chul Kam Ju-Hong Jeon Jong Kwan Parks Sung Won Lee Department of Urology Samsung Medical Center Sungkyunkwan University School of Medicine Seou1135-710 Korea Department of Urology Gachon University Gil Hospital Incheon 405-760 Korea Department of Urology Gyeengsang National University College of Medicine Gyeongsangnam-do 660-702 Korea Department of Physiology and Biophysics Seeul National University College of Medicine Seeul 110-799 Korea Department of Urology Medical School Chonbuk National University and Institute for Medical Sciences Chonbuk National University and Research Institute and Clinical Trial Center of Medical Device of Chonbuk National University Hospital Jeonju-si 561-712 Korea

In this study, we investigated the effects of a combination of Ginkgo biloba extracts （GBE） and phosphodiesterase type 5 （PDE-5） inhibitors on the muscular tone of the corpus cavernosum and potassium channel activity of corporal smooth muscle cells. Strips of corpus cavernosum from male New Zealand white rabbits were mounted in organ baths for isometric tension studies. After contraction with 1 × 10^-5 mol I^-1 norepinephrine, GBE （0.01-1 mg ml^-1） and mirodenafil （0.01-100 nmol I^-1） were added together into the organ bath. In electrophysiological studies, whole-cell currents were recorded by the conventional patch-clamp technique in cultured smooth muscle cells of the human corpus cavernosum. The corpus cavemosum was relaxed in response to GBE in a dose-dependent manner （from 0.64%±8.35% at 0.01 mg ml^-1 to 52.28%±11.42% at 1 mg ml^-1）. After pre-treatment with 0.03 mg ml^-1 of GBE, the relaxant effects of mirodenafil were increased at all concentrations, After tetraethylammonium （TEA）（1 mmol I^-1） administration, the increased effects were inhibited （P〈0.01）. Extracellular administration of GBE increased the whole-cell K^＋ outward currents in a dose-dependent fashion. The increase of the outward current was inhibited by I mmol 1-1 TEA. These results suggest that GBE could increase the relaxant potency of mirodenafil even at a minimally effective dose. The K＋ flow through potassium channels might be one of the mechanisms involved in this synergistic relaxation.

关键词： calcium-activated potassium channels erectile dysfunction Ginkgo biloba phosphodiesterase inhibitors smooth muscles

Magnetic resonance evaluation of human mesenchymal stem cells in corpus cavernosa of rats and rabbits

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2007年第3期9卷 361-367页

作者： Yun-Seob Song Ja-Hyeon Ku Eun-Seop Song Jung-Hoon kim Jin-Suck Jeon Kong-Hee Lee Sook-Ja kim Hee-Jeong Cheong Ik-Sung Lim Dongho Choi Jong-Ho Won Department of Urology Stem Cell therapy Center Soonchunhyang School of Medicine Seoul 140-743 Korea Department of Urology Seoul National University Hospital Seoul 110-744 Korea Department of Obstetrics and Gynecology Inha University School of Medicine Incheon 400-103 Korea Department of Radiology Soonchunhyang School of Medicine Seoul 140-743 Korea Department of Internal Medicine Soonchunhyang School of Medicine Seoul 140-743 Korea Department of Urology Soonchunhyang School of Medicine Seoul 140-743 Korea Stem Cell therapy Center Soonchunhyang School of Medicine Seoul 140-743 Korea Department of Industrial Management ＆ Engineering Namseoul University College of Engineering Cheonan 330-707 Korea Department of Surgery Stem Cell therapy Center Soonchunhyang School of Medicine Seoul 140-743 Korea Department of Internal Medicine Stem Cell therapy Center Soonchunhyang School of Medicine Seoul 140-743 Korea

Aim： To investigate whether the biological process of superparamagnetic iron oxide （SPIO）-labeled human mesenchymal stem cells （hMSCs） may be monitored non-invasively by using in vivo magnetic resonance （MR） imaging with conventional 1.5-T system examinations in corpus cavernosa of rats and rabbits. Methods： The labeling efficiency and viability of SP10-labeled hMSCs were examined with Prussian blue and Tripan blue, respectively. After SPIO-labeled hMSCs were transplanted to the corpus cavernosa of rats and rabbits, serial T2-weighted MR images were taken and histological examinations were carried out over a 4-week period. Results： hMSCs loaded with SPIO compared to unlabeled cells had a similar viability. For SPIO-labeled hMSCs more than lx 105 concentration in vitro, MR images showed a decrease in signal intensity. MR signal intensity at the areas of SPIO-labeled hMSCs in the rat and rabbit corpus cavernosa decreased and was confined locally. After injection of SPIO-labeled hMSCs into the corpus cavernosum, MR imaging demonstrated that hMSCs could be seen for at least 12 weeks after injection. The presence of iron was confirmed with Prussian blue staining in histological sections. Conclusion： SP10-labeled hMSCs in corpus cavernosa of rats and rabbits can be evaluated non-invasively by molecular MR imaging. Our findings suggest that MR imaging has the ability to test the long-term therapeutic potential of hMSCs in animals in the setting of erectile dysfunction.

关键词： human mesenchymal stem cells magnetic resonance stem cells penis cell labeling corpus cavemosa

Electrochemically metal-doped reduced graphene oxide films:Properties and applications

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 Materials Science & Technology 2020年第5期40卷 72-80页

作者： Myung-Sic Chae Tae Ho Lee Kyung Rock Son Tae Hoon Park Kyo Seon Hwang Tae Geun kim School of Electrical Engineering Korea UniversityAnam-ro 145Seongbuk-guSeoul 02841South Korea Department of Clinical Pharmacology and Therapeutics College of MedicineKyung Hee UniversitySeoul 02447South Korea

The fine control of doping levels in graphene materials such as reduced graphene oxide(RGO)is important to properly manipulate their ambipolar transport characteristics for various device ***,conventional doping methods involve complex chemical reactions,large-scale doping processes,and poor ***,a simple and controllable electrochemical doping treatment(EDT),performed via the conductive channels created at the RGO surface by the application of an electric field,is introduced to tailor the electrical properties of RGO films.X-ray photoelectron spectroscopy and Raman spectroscopy measurements are performed to detect the presence of Ni atoms in RGO films after the EDT(EDT-RGO).Then,EDT-RGO field-effect transistors(FETs)are fabricated with different doping areas(0 to 100%fractional area)on the RGO active channel to investigate the effect and selective-area doping capability of the *** to p-type doping compensation by the intercalated Ni atoms,the electron mobility of the EDT-RGO FET decreases from 1.40 to 0.12 cm2 V-1s-1 compared with that of the undoped RGO-FET,leading to the conversion from ambipolar to unipolar p-type transfer characteristics.

关键词： Reduced graphene oxide Electrochemical doping treatment Electrical breakdown process Field-effect transistor

Combination-based nanomaterial designs in single and double dimensions for improved electrodes in lithium ion-batteries and faradaic supercapacitors

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第11期28卷 119-146页

作者： Tuyet Nhung Pham Duckshin Park Yongil Lee Il Tae kim jaehyun Hur You-Kwan Oh Young-Chul Lee Department of BioNano Technology Gachon University1342 SeongnamdaeroSujeong-guSeongnam-siGyeonggi-do 13120Republic of Korea Korea Railroad Research Institute(KRRI) 176 Cheoldobakmulkwan-roUiwang-si 16105Gyeonggi-doRepublic of Korea Department of Chemical and Biological Engineering Gachon UniversitySeongnam-siGyeonggi-do 13120Republic of Korea School of Chemical and Biomolecular Engineering Pusan National UniversityBusan 46241Republic of Korea

In the past decade, researchers in the fields of energy production have concentrated on the improvement of new energy storage devices. Lithium-ion batteries(LIBs) and faradaic supercapacitors(FSs) have attracted special attention as a result of the rapid development of new electrode nanomaterials, especially hybrid nanomaterials, which can meet the increasingly higher requirements for future energy, such as the capability to deliver high-power performance and an extremely long life cycle. In these hybrid nanostructures, a series of synergistic effects and unique properties arising from the combination of individual components are a major factor leading to improved charge/discharge capability, energy density, and system lifetime. This paper describes the most recent progress in the growth of hybrid electrode materials for LIBs and FSs systems, focusing on the combination of zero-dimensional(0 D), one-dimensional(1 D), two-dimensional(2 D), and three-dimensional(3 D) nanomaterials, respectively.

关键词： Hybrid nanomaterials Synergistic effects Zero-dimensional nanomaterials One-dimensional nanomaterials Two-dimensional nanomaterials Three-dimensional nanomaterials