检索结果-南通市图书馆

Synthesis of optically active polymers bearing amino acid moieties by atom transfer radical polymerization

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第7期18卷 875-878页

作者： Liang Feng Fa Bao Zhao zhi Lei liu jian Ping Sun Ji Wen Hu Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 China

We report here an approach toward the synthesis of optically active polyacrylamide bearing amino acid moieties, poly[Nmethacryloyl L-leucine methyl ester] （PMALM）, with controlled average number molecular weight （Mn） and relatively narrow polydispersity index （PDI, Mw/Mn 〈 1.3） by atom transfer radical polymerization （ATRP） using initiating system methyl 2-bromopropionate/CuBr/tris（2-dimethylaminoethyl） amine. The optical properties of the resulting polymers were evaluated from specific optical rotation value and CD spectra.

关键词： Optically active polymer Atom transfer radical polymerization Poly[N-methacryloyl L-leucine methyl ester]

In situ formed three-dimensional (3D) lithium-boron(Li-B) alloy as a potential anode for next-generation lithium batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第12期40卷 3494-3500页

作者： Hai-Feng Huang Yi-Na Gui Fu Sun zhi-jian liu Hui-Long Ning Chen Wu Li-Bao Chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China

The practical application of the lithium anode in lithium metal batteries(LMBs) has been hindered by the uncontrollable growth of lithium dendrite and the high volumetric change during cycling. Herein, the in situ formed three-dimensional(3D) lithium-boron(Li-B) alloy is suggested as an excellent alternative to the Li metal, in which the 3D Li B skeleton can mitigate the growth of Li dendrites and volumetric change. In this study, the Li-B alloy anodes with different B contents were manufactured by high-temperature melting. It was found that the boron content had a significant effect on the electrochemical performance of the Li-B alloy. The Li-B alloy with the least B content(10 wt%, 10LiB) demonstrated the lowest overpotential of 0.0852 V after 300 h and the lowest interface resistance. However, the full cell with 15LiB as the anode displayed the best cycling performance of 115 m Ah·g^(-1) after 100 cycles with a columbic efficiency greater than 97%. The obtained results suggest that the in situ formed three-dimensional Li-B alloy anode can be an excellent alternative to the Li anode via tuning B contents for next-generation high energy density LMBs.

关键词： Li-B alloy 3D skeleton Solid electrolyte interface(SEI) Anode Lithium metal battery

Postoperative decrease of serum albumin predicts shortterm complications in patients undergoing gastric cancer resection

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第27期23卷 4978-4985页

作者： zhi-jian liu Xiao-Long Ge Shi-Chao Ai Hong-Kan Wang Feng Sun Li Chen Wen-Xian Guan Department of Gastrointestinal Surgery Nanjing Drum Tower Hospitalthe Affiliated Hospital of Nanjing University Medical School Sir Run Run Shaw Hospital Zhejiang University School of Medicine First Affiliated Hospital of Zhejiang University School of Medicine

AIM To find an accurate and simple predictor for postoperative short-term complications after gastrectomy. METHODS Two hundred and twenty-three patients undergoing gastric cancer resection between October 1,2015 and September 30,2016 were enrolled in this study. Univariate and multivariate analyses were used toidentify risk factors for complications after gastrectomy. The cutoff values and diagnostic accuracy were examined by receiver operating characteristic *** Sixty-two(27.8%) patients had short-term complications after gastric cancer resection. The postoperative decrease in serum albumin(?ALB) was an independent risk factor for complications(OR = 17.957,95%CI: 6.073-53.095,P < 0.001). The cutoff value was 14.0% and the area under the curve was higher than that of C-reactive protein on postoperative day 3(area under the curve: 0.806 vs 0.709). Patients with ?ALB ≥ 14.0% were more likely to have short-term complications after gastrectomy(46.7% vs 5.0%,P < 0.001),prolonged hospital stay(17.2 ± 10.8 d vs 14.1 ± 4.2 d,P = 0.007) and higher comprehensive complication index(P < 0.001) than those with ?ALB < 14.0%.CONCLUSION Postoperative ?ALB with a cutoff of 14.0% can be used to recognize patients who have high risk of short-term complications following gastric cancer resection.

关键词： Gastric cancer Postoperative complications Gastrectomy Serum albumin Predictor

An Ionic Liquid-assisted Hydrothermal Synthesis of Ce02 Nanorods

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

无机材料学报 2015年第3期30卷 325-329页

作者： CHEN Ting jianG Wei-Hui ZHANG Xiao-Jun XIE zhi-Xiang liu jian-Min jianG Wan School of Material Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333001 China

CeO2 nanorods were synthesized by a hydrothermal method at 160℃ from CeC16-6H20 and NH3.H20 in the presence of an ionic liquid 1-butyl-3-methyl-imidazolium chloride （[Bmim]C1）. The phase and morphology of the result- ing products were characterized by X-ray diffraction （XRD） and high-resolution transmission electron microscopy （HRTEM）, respectively. The results reveal that morphology of CeO2 prepared in the presence of the ionic liquid is nano- rod while it changes to irregular nanoparticle without ionic liquid. The resulting nanorods are about 13-25 nm in diameter and 200-500 nm in length. With the increase of ionic concentration, nanorods were disappeared gradually and nanoparticles were obtained. Moreover, increasing the hydrothermal temperature to 180℃, nanospheres at size of 19-24 nm could be synthesized by aggregation of-2 nm nanocrystals.

关键词： cerium oxide soft template hydrothermal treatment ionic liquid nanorod

Visual analysis of advance care planning related studies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

TMR Clinical Research 2020年第2期3卷 70-79页

作者： Qi Wu zhi-jian liu Xiao-Li Pang Ling Cheng Graduate School of Tianjin University of Traditional Chinese Medicine Tianjin 301617China School of Nursing Tianjin University of Traditional Chinese MedicineTianjin 301617China

Backgroud:To provide a reference for the further development of the field of the advance care planning(ACP),through the visual analysis of the related literature on the ***:Taking the core collection database of Web of ScienceTM as data sources,the method of subject word retrieval is *** metrology and CiteSpaceⅤinformation visualization software were used to analyze the literature on ACP published from inception to September ***:A total of 1,981 literature were *** number of ACP studies increased,USA published the most literature in the world,followed by Australia,Britain,Canada and the Netherlands and so *** most leading published journal was the Journal of Palliative Medicine,and the highest impact factor was Palliative Medicine(4.956).Sudore,Rebecca L and Hillary D Lum are the key researcher networks with the largest amount of articles published in ACP *** research content mainly included the definition,implementation process and implementation effect of *** focused on palliative care,hospice care,decision-making,communication,patient preference and so ***:The studies on ACP is on the rise,the research content is deepening,which suggests that we can learn from the research results of foreign countries in this field and continue to deepen the research in the field of ACP in China.

关键词： Advance care planning Bibliometrics Visual analysis

Design and Analysis of Ring Resonator with Thermal Tuning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Semiconductor Photonics and Technology 2007年第1期13卷 7-11页

作者： WANG Yi-feng liu Yong-zhi YUAN Ke-jian liu Shuang School of Opto-Electronic Information University of Electronic Science and Technology of China Chengdu 610054 CHN

A type of waveguide ring resonator, based on Er3+/Yb3+ co-doped phosphate glass and using thermal-optical effect as tuning manner, is brought up. The ring resonator is composed of two straight waveguides and a ring waveguide with radius of 400 μm. Electrode is evaporated on the top of the waveguide to achieve thermal tuning. Firstly, the filtering scheme of the ring resonator is analyzed, then how parameters of the electrode influence the filtering characteristics is discussed.

关键词： ring resonator thermal-optical effect phosphate glass

Outcomes of endoscopic sphincterotomy vs open choledochotomy for common bile duct stones

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2019年第4期25卷 485-497页

作者： Xiao-Dong Zhou Qiao-Feng Chen Yuan-Yuan Zhang Ming-Ju Yu Chang Zhong zhi-jian liu Guo-Hua Li Xiao-jiang Zhou Jun-Bo Hong You-Xiang Chen Department of Gastroenterology The First Affiliated Hospital of Nanchang University

BACKGROUND Endoscopic sphincterotomy(EST) for the management of common bile duct stones(CBDS) is used increasingly widely because it is a minimally invasive procedure. However, some clinical practitioners argued that EST may be complicated by post-endoscopic retrograde cholangiopancreatography(ERCP)pancreatitis(PEP) and accompanied by a higher recurrence of CBDS than open choledochotomy(OCT). Whether any differences in outcomes exist between these two approaches for treating CBDS has not been thoroughly elucidated to *** To compare the outcomes of EST vs OCT for the management of CBDS and to clarify the risk factors associated with stone *** Patients who underwent EST or OCT for CBDS between January 2010 and December 2012 were enrolled in this retrospective study. Follow-up data were obtained through telephone or by searching the medical records. Statistical analysis was carried out for 302 patients who had a follow-up period of at least 5 years or had a recurrence. Propensity score matching(1:1) was performed to adjust for clinical differences. A logistic regression model was used to identify potential risk factors for recurrence, and a receiver operating characteristic(ROC)curve was generated for qualifying independent risk *** In total, 302 patients undergoing successful EST(n = 168) or OCT(n = 134) were enrolled in the study and were followed for a median of 6.3 years. After propensity score matching, 176 patients remained, and all covariates were balanced. EST was associated with significantly shorter time to relieving biliary obstruction, anesthetic duration, procedure time, and hospital stay than OCT(P <0.001). The number of complete stone clearance sessions increased significantly in the EST group(P = 0.009). The overall incidence of complications and mortality did not differ significantly between the two groups. Recurrent CBDS occurred in18.8%(33/176) of the patients overall, but no difference was found between the EST(20.5%,

关键词： Common bile duct stone Choledochotomy Endoscopic sphincterotomy Outcome Recurrence Risk factor

Age softening phenomenon and microscopic mechanism of Li−B alloy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2020年第9期30卷 2491-2501页

作者： Hai-feng HUANG zhi-jian liu Chao-ping LIANG Li-bao CHEN State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

The age softening phenomenon of the Li−B alloy was investigated by a series of tensile tests under various aging *** results show that the tensile strength of the rolled Li−B alloy decreases with increasing aging *** aging temperature accelerates the softening process,and leads to an early end of aging.A model was proposed to analyze the mechanism of the age *** vacancy annihilation is the control factor of age *** strength−temperature relationship was estimated by the newly proposed model and a standard heat treatment,annealing at 150℃ for 1 h,was designed to eliminate the age softening of rolled Li−B alloy.

关键词： thermal battery Li−B alloy age softening lithium metal battery lithium dendrite

Real-world evidence on the efficacy and safety of vonoprazanamoxicillin dual therapy for Helicobacter pylori treatment in elderly patients

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第1期31卷 68-78页

作者： Wen Gao Jing-Wen Li Hui Ye Xue-zhi Zhang jian-Xiang liu Hong Cheng Department of Gastroenterology Peking University First HospitalBeijing 100034China School of Medicine Tsinghua MedicineTsinghua UniversityBeijing 100034China Department of Traditional Chinese Medicine and Integrative Medicine Peking University First HospitalBeijing 100034China

BACKGROUND A dual therapy regimen containing amoxicillin is a common treatment option for the eradication of Helicobacter pylori(***).While substantial research supports the efficacy and safety of vonoprazan and amoxicillin(VA)dual therapy in the general population,there is still a lack of studies specifically focusing on its safety in elderly *** To evaluate efficacy and safety of VA dual therapy as first-line or rescue treatment for *** in elderly *** As a real-world retrospective study,data were collected from elderly patients aged 60 years and above who accepted VA dual therapy(vonoprazan 20 mg twice daily+amoxicillin 1000 mg thrice daily for 14 days)for *** eradication in the Department of Gastroenterology at Peking University First Hospital between June 2020 and January *** status was evaluated by^(13)C-urease breath test 6 weeks after *** adverse events(AEs)during treatment were *** In total,401 cases were ***-one cases were excluded due to loss to follow-up,lack of re-examination,or unwillingness to take *** total of 380 included cases comprised 250 who received VA dual therapy as first-line treatment and 130 who received VA dual therapy as rescue *** was successfully eradicated in 239 cases(95.6%)in the first-line treatment group and 116 cases(89.2%)in the rescue treatment *** overall incidence of AEs was 9.5%for both ***,9.2%of patients experienced an AE in the first-line treatment group and 10.0%in the rescue treatment *** patients discontinued treatment due to AE,with a discontinuation rate of 1.3%.No serious AE *** The VA dual therapy regimen as a first-line treatment and a rescue therapy was effective and safe for elderly patients aged 60 and older.

关键词： Helicobacter pylori Vonoprazan Amoxicillin Dual therapy Elderly