检索结果-南通市图书馆

Morphology,structure and corrosion resistance of Mg-Al LDH films fabricated in different Al^(3+)concentration solutions

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第2期42卷 697-704页

作者： Liang Wu xing-xing Ding Xiao-Feng Zhao Yuan-Huan Liu Xue-Long Hao Ai-Tao tang gen Zhang Fu-Sheng Pan School of Materials Science and Engineering Chongqing UniversityChongqing400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing400044China SunRui Marine Environment Engineering Company Ltd Qingdao266101China National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials General Research Institute for Nonferrous MetalsBeijing100088China

In situ-grown Mg-Al layered double hydroxide(LDH)films were obtained on an anodized AZ31 substrate,with the immersion of sample in different concentrations of Al^(3+)*** structure,composition and morphology of LDH films were investigated by X-ray diffraction(XRD),Fourier transform infrared(FTIR)and scanning electronic microscopy(SEM),and the corrosion behavior of LDH films was further studied by electrochemical impedance spectroscopy(EIS).The influence of Al^(3+)concentration on the growth behavior of LDH was also *** results indicated that the nest-like structure of MgAl-LDH film was composed of interconnected MgAl-LDH ***,the LDH obtained in0.032 mol·L^(-1)Al^(3+)solution,possessing dense laminated structure,could effectively seal the porous surface of anodic oxide *** results revealed that the samples coated with LDH films showed a higher electrochemical impedance,and thus,the corrosion resistance of samples coated with LDH films was signally improved compared with the anodized alloy.

关键词： Magnesium alloy In situ method Layered double hydroxide(LDH)films Al^(3+)concentration Corrosion resistance

裂隙发育岩体水电工程地下洞室预裂爆破试验研究

在线全文

学校读者我要写书评

暂无评论

爆破 2024年第2期41卷 67-74页

作者：陈星艮关富僳付兆凯纳小平郝利军李洪涛四川大学水利水电学院成都610065 四川水发勘测设计研究有限公司成都610065 中国水利水电第五工程局有限公司成都610066

硬梁包水电站地下厂房地质构造复杂,围岩裂隙发育,岩性杂乱,岩体具有“硬、碎、杂”特点,厂房开挖成型难度较大、预裂爆破效果差,为解决此问题,结合地下厂房第Ⅲ层中部拉槽施工预裂,开展了系统的爆破试验。初期试验中,预裂爆破线装药密... 详细信息

硬梁包水电站地下厂房地质构造复杂,围岩裂隙发育,岩性杂乱,岩体具有“硬、碎、杂”特点,厂房开挖成型难度较大、预裂爆破效果差,为解决此问题,结合地下厂房第Ⅲ层中部拉槽施工预裂,开展了系统的爆破试验。初期试验中,预裂爆破线装药密度低于规范计算值近100 g/m的情况下,两侧边墙岩体在爆破后十分破碎,无法明显看到预裂孔的痕迹。开展的岩体声波测试和岩体完整性分析表明:厂房岩体全孔平均纵波速度为4.03 km/s,整体完整性差;岩体沿预裂孔轴向0~1.5 m、1.5~3.9 m、3.9~7.4 m深度的分段波速平均值分别为2.59 km/s、3.58 km/s、4.70 km/s,表现出在深度方向上的分段完整性差异。根据上述特点,在厂房开挖施工过程中,预裂爆破的平均单孔线装药密度取为0.123~0.284 kg/m,并针对不同深度选取不同的线装药密度,各分段采用小药卷均匀间隔装药,试验和应用效果良好,保证了壁面基本成型,半孔率显著提高。

关键词：地下洞室裂隙发育岩体预裂爆破参数优化装药结构

Surface microstructure control of microalloyed steel during slab casting

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2017年第8期24卷 803-810页

作者： Li-jun Xu Shu-lan Zhang Chun-gen Qiu Sheng-tao Qiu xing-zhong Zhang Central Iron and Steel Research Institute Beijing 100081China

Lots of work has been done to investigate slab surface microstructure evolution during continuous casting in order to improve hot ductility and avoid transverse *** slab surface microstructure after continuous casting was characterized by optical microscopy,and the precipitation behavior was investigated by transmission electron *** the same time,the mechanical properties of the slabs were measured using a Gleeble 1500 Dthermal simulator and the transformation temperatures were examined by means of a thermal *** experimental results show that homogeneous microstructure without film-like ferrites and chain-like precipitates at grain boundary can be obtained through surface intensive cooling and transverse cracks do not occur on the slab *** the experimental steel,fine ferrite can form at slab surface when the water flow rate is larger than 1560L/min at vertical *** the distance to surface increases,microstructure turned to ferrite and ***,nano-size carbonitrides precipitated in the ferrite grain and the size was larger at the junction of the *** mechanical experiment results show that the hot ductility of the sample deformed at 650°C was better than that of the sample deformed at 750°*** reason is that filmlike ferrite formed at the grain boundary in the sample deformed at 750°***,the slab must be cooled quickly below Ar3 to prevent the occurrence of film-like ferrite and transverse cracks on the slab surface during casting.

关键词： Microalloyed steel Surface intensive cooling Ferrite Carbonitride Crack

Study on B_d→φK_s Decay in EDQS Model

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第11期52卷 919-923页

作者： WANG Shuai-Wei LI gen-Quan YANG xing-Qiang HUANG Jin-Shu Department of Physics Nanyang Normal University Nanyang 473061 China

We study Bd → φKs decay in extra down-type quarks （EDQS） model with a non-universal Z boson associated with flavor changing neutral currents （FCNCs） at the tree level. With the up-to-date experimental data of Br（Bd → φKs）, SCKs, and ACKs, we derive the bounds on the Z-b-s coupling parameter ｜Ubs ｜ and the new weak phase φ, using the constrained parameter spaces, we finally give predictions for Bd → φφ decay, which could be tested at the Fermilab Tevatron and the LHC-b experiments.

关键词： EDQS modell CP asymmetry QCD factorization

基于指纹图谱与多指标成分定量结合化学模式识别分析的小儿热速清颗粒质量评价研究

在线全文

学校读者我要写书评

暂无评论

药物分析杂志 2024年第6期44卷 1062-1073页

作者：周爱鲜廖正根勒孚仕刘慧星赵国巍梁新丽江西中医药大学现代中药制剂教育部重点实验室南昌330004 江西倍肯药业有限公司宜春336400

目的:采用指纹图谱、多指标成分含量测定与化学模式识别分析技术相结合的方法研究不同批次小儿热速清颗粒,为其质量评价提供依据。方法:采用SuperLu C18色谱柱(250 mm×4.6 mm, 5μm),流动相为甲醇(A)-0.1%磷酸水(B),梯度洗脱,体积流量1... 详细信息

目的:采用指纹图谱、多指标成分含量测定与化学模式识别分析技术相结合的方法研究不同批次小儿热速清颗粒,为其质量评价提供依据。方法:采用SuperLu C18色谱柱(250 mm×4.6 mm, 5μm),流动相为甲醇(A)-0.1%磷酸水(B),梯度洗脱,体积流量1.0 mL·min^(-1),柱温30℃,检测波长280 nm,对15批小儿热速清颗粒指纹图谱进行相似度评价,指认出11个特征成分,并对葛根素、连翘酯苷A、连翘苷、黄芩苷、汉黄芩苷、黄芩素、汉黄芩素7个有效成分进行含量测定,采用聚类分析(HCA)及主成分分析(PCA)对15批样品进行分类并进行正交最小偏二乘法-判别分析(OPLS-DA),筛选出样品批次间差异成分。结果:建立了小儿热速清颗粒HPLC指纹图谱及7个成分的含量测定方法,且这2种方法学验证的结果均符合要求,确定了28个共有峰,并指认了11个色谱峰,15个批次相似度范围为0.995~0.999;HCA和PCA结果显示15个批次成分聚为2类,OPLS-DA分析筛选出13个造成样品批次间差异的标志物;多指标成分含量测定表明不同批次间小儿热速清颗粒中化学成分含量差异性较小。结论:建立的小儿热速清颗粒HPLC指纹图谱及7个成分含量测定方法的专属性强,准确、可靠,结合化学模式识别可有效的用于小儿热速清颗粒的质量控制。

关键词：小儿热速清颗粒高效液相色谱法指纹图谱相似度评价化学模式识别主成分分析多成分含量测定质量评价相关性分析

Gold-leaching performance and mechanism of sodium dicyanamide

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1759-1768页

作者： gen-zhuang Li Jue Kou Yi xing Yang Hu Wei Han Zi-yuan Liu Chun-bao Sun University of Science and Technology Beijing School of Civil and Resource EngineeringBeijing 100083China University of Science and Technology Beijing School of Energy and Environmental EngineeringBeijing 100083China

In this work,sodium dicyanamide(SD)was used as a leaching reagent for gold recovery,and the effects of the SD dosage and solution pH on the gold-leaching performance were investigated.A gold recovery of 34.8%was obtained when SD was used as the sole leaching reagent at a dosage of 15 kg/*** the presence of a certain amount of potassium ferrocyanide(PF)in the SD solution,the gold recovery was found to increase from 34.8%to 57.08%.Using the quartz crystal microbalance with dissipation(QCM-D)technique,the leaching kinetics of SD with and without PF were *** QCM-D results indicate that the gold-leaching rate increased from 4.03 to 39.99 ng·cm^(–2)·min^(–1) when the SD concentration was increased from 0 to 0.17 mol/L,and increased from 39.99 to 272.62 ng·cm^(–2)·min^(–1) when 0.1 mol/L of PF was used in combination with *** pregnant solution in the leaching tests was characterized by X-ray photoelectron spectroscopy and electrospray mass spectrometry,which indicated that Au and(N(CN)2)–in the SD solution formed a series of metal complex ions,[AuNax(N(CN)2)x+2]–(x=1,2,3,or 4).

关键词： gold leaching sodium dicyanamide QCM-D leaching kinetics potassium ferrocyanide

TP53-induced glycolysis and apoptosis regulator alleviates hypoxia/ischemia-induced microglial pyroptosis and ischemic brain damage

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2021年第6期16卷 1037-1043页

作者： Lan-Lan tan Xiao-Lu Jiang Li-Xiao Xu gen Li Chen-Xi Feng Xin Ding Bin Sun Zheng-Hong Qin Zu-Bin Zhang xing Feng Mei Li Department of Neonatology Children’s Hospital of Soochow UniversitySuzhouJiangsu ProvinceChina Department of Pediatrics Research Institute Children’s Hospital of Soochow UniversitySuzhouJiangsu ProvinceChina Jiangsu Key Laboratory of Neuropsychiatric Diseases Department of PharmacologyCollege of Pharmaceutical SciencesSoochow UniversitySuzhouJiangsu ProvinceChina

Our previous studies have demonstrated that TP53-induced glycolysis and apoptosis regulator(TIGAR)can protect neurons after cerebral ischemia/***,the role of TIGAR in neonatal hypoxic-ischemic brain damage(HIBD)remains *** the present study,7-day-old Sprague-Dawley rat models of HIBD were established by permanent occlusion of the left common carotid artery followed by 2-hour *** 6 days before induction of HIBD,a lentiviral vector containing short hairpin RNA of either TIGAR or gasdermin D(LV-sh_TIGAR or LV-sh_GSDMD)was injected into the left lateral ventricle and *** aggressively proliferating immortalized(HAPI)microglial cell models of in vitro HIBD were established by 2-hour oxygen/glucose deprivation followed by 24-hour *** days before in vitro HIBD induction,HAPI microglial cells were transfected with LV-sh_TIGAR or LV-sh_*** results showed that TIGAR expression was increased in the neonatal rat cortex after HIBD and in HAPI microglial cells after oxygen/glucose deprivation/*** TIGAR knockdown in rats markedly worsened pyroptosis and brain damage after hypoxia/ischemia in vivo and in *** of exogenous nicotinamide adenine dinucleotide phosphate(NADPH)increased the NADPH level and the glutathione/oxidized glutathione ratio and decreased reactive oxygen species levels in HAPI microglial cells after oxygen/glucose deprivation/***,exogenous NADPH blocked the effects of TIGAR knockdown in neonatal HIBD in vivo and in *** findings show that TIGAR can inhibit microglial pyroptosis and play a protective role in neonatal *** study was approved by the Animal Ethics Committee of Soochow University of China(approval No.2017LW003)in 2017.

关键词： hypoxic-ischemic brain damage in vitro in vivo microglia NADPH pyroptosis ROS TIGAR

Expression of Embryonic Stem Cell Marker Oct-4 and Its Prognostic Significance in Rectal Adenocarcinoma

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2010年第2期22卷 106-111页

作者： Chun-gen xing Xue-guan Lu Yong-sheng Zhang Fang Zhou Xiao-ping Xu Department of general Surgery Second Affiliated Hospital of Soochow University Suzhou 215004 China Department of Radiation Oncology Second Affiliated Hospital of Soochow University Suzhou 215004 China Department of Pathology Second Affiliated Hospital of Soochow University Suzhou 215004 China

Objective： Recent evidence suggests that Oct-4 is highly expressed in several cancers, and its expression contributes to tumor growth. In this study, we investigated the level of Oct-4 expression in rectal adenocarcinoma, and evaluated the prognostic significance of Oct-4 expression in these cases. Methods： The immunohistochemical expression of Oct-4 was evaluated in 52 formalin-fixed paraffin-embedded postoperative rectal adenocarcinoma tissue samples. The impact of the immunoreactivity of Oct-4 in regard to clinical outcome was determined by Kaplan-Meier and log-rank. Results： The expression level of Oct-4 ranged from 0 to 18.5%. There was no significant association between Oct-4 expression and gender （P=0.772）, age （P=0.123）, clinical stage （P=0.391）, and histological grade （P=0.056）. The 3-year local recurrence-free rates with negative and positive expression of Oct-4 were 83.5% and 75.0%, respectively （P=0.583）. The 3-year metastasis-free rates with negative and positive expression of Oct-4 were 88.6% and 61.9%, respectively （P=0.035）. The 3-year overall survival rates with negative and positive expression of Oct-4 were 77.9% and 49.0%, respectively （P=0.037）. Conclusion： The results suggest that embryonic stem cell marker Oct-4 expression may have prognostic significance in patients with rectal adenocarcinoma. However, to confirm this more and larger studies are required.

关键词： Rectum Adenocarcinoma Oct-4 Stem ceil Prognosis

A Node Splitting Interface Algorithm for Multi-rate Parallel Simulation of DC Grids

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2018年第3期4卷 388-397页

作者： Qing Mu Jun Liang Xiaoxin Zhou gen Li xing Zhang Cardiff University Cardiff CF243AA China Electric Power Research Institute Beijing 100192China

With wider applications of power electronic devices in modern power systems,simulation using traditional electro-mechanical and electromagnetic simulation tools suffer from low speed and ***-rate technologies can greatly improve simulation efficiency by avoiding simulating the entire system using a small ***,the drawbacks of the current synchronization mechanisms is that they introduce numerical errors and numerical instabilities in multi-rate parallel *** improved multi-rate parallel technology,node splitting interface(NSI),is proposed to reduce errors and enhance simulation stability.A new synchronization mechanism is used to avoid prediction and signal *** analyses are carried out to prove the convergence and absolute stability of the proposed NSI *** algorithm is particularly suitable for simultaneously investigating long term dynamics of DC grids and fast transients of power electronic converters.

关键词： DC grids electromagnetic transient analysis multi-rate interface parallel algorithm power system simulation