检索结果-南通市图书馆

Nickel-carbonate nanowire array： An efficient and durable electrocatalyst for water oxidation under nearly neutral conditions

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2018年第3期12卷 467-472页

作者： Yuyao Ji Min ma xuqiang Ji Xiaoli Xiong Xuping Sun College of Chemistry and materials Science Sichuan Normal University Chengdu 610068 China College of Chemistry Sichuan University Chengdu 610064 China Key Lab of Process Analysis and Cont ol of Sichuan Universities Yibin University Yibin 644000 China

It is highly attractive but still remains a great challenge to develop an efficient electrocatalyst for oxygen evolution reaction under nearly neutral conditions. In this work, we report the transformation of Ni3S2 nanowire array on nickel foam into the amorphous nickel carbonate nanowire array on nickel foam （NiCO3/NF）. The resulting NiCO3/NF shows high electrocatalytic activity towards water oxidation and affords current density of 50 ma. cm-2 at overpotential of 395 mV in 1.0 mol·L^-1 KHCO3. Moreover, this NiCO3/NF is also durable with a long-term electrochemical durability of 60 h. This catalyst electrode achieves a high turnover frequency of 0.21 mol O2·s^-1 at the overpotential of 500 mV.

关键词： water oxidation NiCO3/NF nearly neutral conditions superior activity electocatalyst

Neuroendoscopic treatment of multiple intracranial arachnoid cysts: a case report

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Neurosurgical Journal 2018年第3期4卷 177-181页

作者： Di Chen Jun Zhang Lixin Wu Xueyuan Li Siqi ma xuqiang Zhu Dongming Yan Department of Neurosurgery The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052China Department of Orthopedics Zhengzhou Orthopedics HospitalZhengzhou 450052China

Background: Multiple arachnoid cysts are very rare within the central nervous system. The cysts will sometimes increase in size with age, lead to the mass effect or cerebrospinal fluid (CSF) flow obstruction, and cause some symptoms, which requires the surgery intervention. Case presentation: A 35-year-old female was admitted to our hospital with some symptoms related to hydrocephalus for 1 month. Brain magnetic resonance imaging (MRI) revealed well-marginated cystic lesions with CSF signal intensity in the ventricular and cisternal systems, bilateral temporal lobes, and left occipital lobe. Cine phase-contrast MRI showed the aqueduct of sylvius was blocked by the cyst in the quadrigeminal cistern. We employed endoscopic ventriculocystostomy and septostomy to create the communication of the cyst with ventricular and cistern system. As a result, the patient’s symptoms were relieved. Conclusions: Endoscopic management can be an effective way for treating intracranial multiple arachnoid cysts, which is the first report of this kind. We hope that this report could help improve the management of intracranial arachnoid cysts with the neuroendoscopic technology.

关键词： Arachnoid cysts Endoscopic fenestration Obstructive hydrocephalus

Antrodia cinnamomea exerts an anti-hepatoma effect by targeting PI3K/AKT-mediated cell cycle progression in vitro and in vivo

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2022年第2期12卷 890-906页

作者： Yan Zhang Pin Lv Junmei ma Ning Chen Huishan Guo Yan Chen Xiaoruo Gan Rong Wang xuqiang Liu Sufang Fan Bin Cong Wenyi Kang Hebei Key Laboratory of Forensic Medicine College of Forensic MedicineHebei Medical UniversityShijiazhuang 050017China Hebei Food Safety Key Laboratory Hebei Food Inspection and Research InstituteShijiazhuang 050091China Cardiovascular Medical Science Center Department of Cell BiologyHebei Medical UniversityShijiazhuang 050017China National R&D Center for Edible Fungus Processing Technology Henan UniversityKaifeng 475004China Research Unit of Digestive Tract Microecosystem Pharmacology and Toxicology Chinese Academy of Medical SciencesBeijing 100730China

Antrodia cinnamomea is extensively used as a traditional medicine to prevention and treatment of liver cancer.However,its comprehensive chemical fingerprint is uncertain,and the mechanisms,especially the potential therapeutic target for anti-hepatocellular carcinoma(HCC)are still unclear.Using UPLC-Q-TOF/MS,139 chemical components were identified in A.cinnamomea dropping pills(ACDPs).Based on these chemical components,network pharmacology demonstrated that the targets of active components were significantly enriched in the pathways in cancer,which were closely related with cell proliferation regulation.Next,HCC data was downloaded from Gene Expression Omnibus database(GEO).The Cancer Genome Atlas(TCGA)and Dis Ge NET were analyzed by bioinformatics,and 79 biomarkers were obtained.Furtherly,nine targets of ACDP active components were revealed,and they were significantly enriched in PI3 K/AKT and cell cycle signaling pathways.The affinity between these targets and their corresponding active ingredients was predicted by molecular docking.Finally,in vivo and in vitro experiments showed that ACDPs could reduce the activity of PI3 K/AKT signaling pathway and downregulate the expression of cell cycle-related proteins,contributing to the decreased growth of liver cancer.Altogether,PI3 K/AKT-cell cycle appears as the significant central node in anti-liver cancer of A.Cinnamomea.

关键词： Antrodia cinnamomea UPLC-Q-TOF/MS Anti-hepatocellular carcinoma Network pharmacology PI3K/AKT Cell cycle

Investigation of carbon fiber composite stiffened skin with vacuum assisted resin infusion/prepreg co-curing process

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2014年第10期57卷 1956-1966页

作者： MA XuQiang GU YiZhuo LI Min LI YanXia ZHANG ZuoGuang Key Laboratory of Aerospace Advanced materials and Performance (Ministry of Education) School of Materials Science and EngineeringBeihang University

Co-cured vacuum assisted resin infusion process(co-VARI process),which combined vacuum assisted resin infusion(VARI)with prepreg vacuum bag only process(VBO),was adopted to fabricate T-shaped stiffened skin with non-crimp fabric(NCF)stiffener and prepreg skin.During compaction stage of co-VARI process,prepreg resin impregnated fiber fabric under elevated temperature and vacuum pressure.This phenomenon was characterized by fluorescent micrographs with different holding temperature and time.Its influences on processing quality and mechanical performance for co-VARI stiffened skin with different filler materials at triangular region were further analyzed by optical micrographs and pull-off test,respectively.The results show that increasing holding temperature and prolonging holding time can promote prepreg resin impregnation in fiber fabric.Moderate prepreg resin impregnation is favorable to reduce resin rich region and increase fiber volume fraction at prepreg-fabric interface.Moreover,prepreg resin impregnation effect plays significant roles on pull-off performance for co-VARI stiffened skin with fabric filler but has negligible influences on specimens with prepreg filler.In addition,compared with stiffened skin with fabric filler,superior processing quality and pull-off performances are achieved for co-VARI stiffened skin with prepreg core filler.These results are helpful to optimize processing procedures and fabricate composite structure by coVARI process.

关键词：树脂浸渍预浸料碳纤维复合材料真空袋皮肤固化过程 VARI 纤维织物

Exploitation of methane in the hydrate by use of carbon dioxide in the presence of sodium chloride

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2009年第4期6卷 426-432页

作者： Zunzhao Li xuqiang Guo Lanying Yang Xiaona ma China Univ Petr State Key Lab Heavy Oil Proc Beijing 102249 Peoples R China

The replacement process of CH4 from CH4 hydrate formed in NaCl solution by using pressurized CO2 was investigated with a self-designed device at temperatures of 271.05, 273.15 and 275.05 K and a constant pressure of 3.30 MPa. The mass fraction of the NaCl solution was either 0.5 wt% or 1.0 wt%. The effects of temperature and concentration of NaCl solution on the replacement process were investigated. Experimental results showed that high temperature was favorable to the replacement reaction but high NaCl concentration had a negative effect on the replacement process. Based on the experimental data, kinetic models of CH4 hydrate decomposition and CO2 hydrate formation in NaCl solution were established. The calculated activation energies suggested that both CH4 hydrate decomposition and CO2 hydrate formation are dominated by diffusion in the hydrate phase.

关键词： CO2 hydrate CH4 hydrate guest molecule replacement kinetic model

在线全文

学校读者我要写书评

暂无评论

结构阻尼混杂复合材料研究进展

宇航材料工艺 2020年第6期50卷 1-7页

作者：马绪强苏正涛中国航发北京航空材料研究院减振降噪材料及应用技术航空科技重点实验室北京100095

纤维增强树脂基复合材料因其比强度比模量高、阻尼减振性能优异等优点已成为航空航天领域重要的结构材料。混杂化是实现复合材料结构承载与阻尼性能一体化的有效途径。本文以近十年结构阻尼混杂复合材料研究为基础,从微纳颗粒混杂、层... 详细信息

纤维增强树脂基复合材料因其比强度比模量高、阻尼减振性能优异等优点已成为航空航天领域重要的结构材料。混杂化是实现复合材料结构承载与阻尼性能一体化的有效途径。本文以近十年结构阻尼混杂复合材料研究为基础,从微纳颗粒混杂、层内编织混杂、层间铺层混杂和插层结构混杂四个方面对结构阻尼混杂复合材料的阻尼减振性能进行了详细分析。指出了结构阻尼混杂复合材料在阻尼减振领域应用存在的问题并给出了建议。

关键词：结构阻尼复合材料阻尼减振混杂损耗因子阻尼比

Experimental study of separation of ammonia synthesis vent gas by hydrate formation

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2009年第2期6卷 188-193页

作者： Dong Taibin Wang Leiyan Liu Aixian Guo xuqiang ma Qinglan Li Guowen Sun Qiang State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China

Termodynamic data on methane hydrate formation in the presence of ammonia are very important for upgrading of ammonia synthesis vent gas using hydrate formation. This paper is focused on the formation conditions of methane hydrate in the presence of ammonia and the effects of gas-liquid ratio and temperature on the separation of vent gas by hydrate formation. Equilibrium data for methane hydrate within an ammonia mole concentration range from 1% to 5 % were obtained. The experimental results indicated that ammonia has an inhibitive effect on hydrate formation. The higher the ammonia concentration, the higher is the pressure reguired for methane hydrate formation would be. The primary experimental results showed that when volume ratio of gas to liquid was 80：1 and temperature was 283.15 K, total mole fraction of （H2＋N2） in gas phase could reach 96.9 %.

关键词： CH4 hydrate ammonia THF thermodynamics separation

地布覆盖不同滴灌量条件下苹果树干液流变化特征研究

在线全文

学校读者我要写书评

暂无评论

山西农业大学学报(自然科学版) 2023年第5期43卷 119-128页

作者：杨凯续海红马冬格李旭强山西农业大学果树研究所山西太原030031 果树种质资源创制与利用山西省重点实验室山西太原030031 山西农业大学园艺学院山西晋中030815

[目的]本研究旨在探究地布覆盖条件下滴灌苹果树的蒸腾耗散规律,为合理制定适宜的果园灌溉制度提供理论方法。[方法]采用插针式植物热扩散液流计于2022年5月-10月,连续监测不同水分处理下滴灌苹果树新梢生长期至成熟期的液流速率变化特... 详细信息

[目的]本研究旨在探究地布覆盖条件下滴灌苹果树的蒸腾耗散规律,为合理制定适宜的果园灌溉制度提供理论方法。[方法]采用插针式植物热扩散液流计于2022年5月-10月,连续监测不同水分处理下滴灌苹果树新梢生长期至成熟期的液流速率变化特征,并结合气象数据分析树干液流速率与气象因子的相关关系,最后利用XGBoost模型建立液流速率与气象因子的关系模型。[结果]苹果树干液流速率在生育期内均呈单峰型曲线,具有明显的昼高夜低日变化特征。生育期的对比表明,新梢生长期苹果树干的单日速率峰值、单日平均液流速率、生育期平均速率及生育期最大值均处于生育期最高水平。不同灌溉处理的液流变化对比显示,低水处理时苹果树干液流变化强度明显减弱,其单日速率峰值、单日平均液流速率、生育期平均速率及生育期最大值较高水处理降低了37.08%~65.27%。全生育期气象参数对树干液流速率的影响强度大小为:太阳辐射>饱和水汽压差>大气温度>相对湿度>风速,其中太阳辐射对果树液流变化的正效应最显著。在此基础上,利用XGBoost算法建立了基于气象参数的苹果树液流速率预测模型,模型的决策系数为0.815。[结论]苹果树的生育期差异、灌溉处理、气象变化对树干液流变化均具有显著影响,其中新梢生长期果树生长旺盛,且受高辐射天气的影响,使得果园的蒸腾耗散强度增加。

关键词：地布覆盖滴灌树干液流 XGBoost模型

Watermelon domestication was shaped by stepwise selection and regulation of the metabolome

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2023年第3期66卷 579-594页

作者： Pingli Yuan Congping Xu Nan He xuqiang Lu Xingping Zhang Jianli Shang Hongju Zhu Chengsheng Gong Hanhui Kuang Tang Tang Yong Xu Shuangwu ma Dexi Sun Weiqin Zhang Muhammad J.Umer Jian Shi Alisdair R.Fernie Wenge Liu Jie Luo Henan Joint International Research Laboratory of South Asian Fruits and Cucurbits Zhengzhou Fruit Research InstituteChinese Academy of Agricultural SciencesZhengzhou 450009China Hainan Yazhou Bay Seed Laboratory Sanya Nanfan Research Institute of Hainan UniversitySanya 572025China Peking University Institute of Advanced Agricultural Sciences Weifang 261325China College of Horticulture and Forestry Sciences Huazhong Agricultural UniversityWuhan 430070China Wuhan Metware Biotechnology Co. Ltd.Wuhan 430070China National Watermelon and Melon Improvement Center Beijing Academy of Agricultural and Forestry SciencesBeijing 100097China max-Planck-Institute of Molecular Plant Physiology Potsdam-Golm 144776Germany College of Tropical Crops Hainan UniversityHaikou 572208China

Although crop domestication has greatly aided human civilization,the sequential domestication and regulation of most quality traits remain poorly understood.Here,we report the stepwise selection and regulation of major fruit quality traits that occurred during watermelon evolution.The levels of fruit cucurbitacins and flavonoids were negatively selected during speciation,whereas sugar and carotenoid contents were positively selected during domestication.Interestingly,fruit malic acid and citric acid showed the opposite selection trends during the improvement.We identified a novel gene cluster(CGC1,cucurbitacin gene cluster on chromosome 1)containing both regulatory and structural genes involved in cucurbitacin biosynthesis,which revealed a cascade of transcriptional regulation operating mechanisms.In the CGC1,an allele caused a single nucleotide change in Cl ERF1 binding sites(GCC-box)in the promoter of Cl Bh1,which resulted in reduced expression of Cl Bh1 and inhibition of cucurbitacin synthesis in cultivated watermelon.Functional analysis revealed that a rare insertion of 244 amino acids,which arose in C.amarus and became fixed in sweet watermelon,in Cl OSC(oxidosqualene cyclase)was critical for the negative selection of cucurbitacins during watermelon evolution.This research provides an important resource for metabolomics-assisted breeding in watermelon and for exploring metabolic pathway regulation mechanisms.

关键词： metabolome mGWAS gene cluster domestication cucurbitacin biosynthesis