检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

延安市枯水期地表水污染源识别及贡献率研究

中国农村水利水电 2024年第3期 110-115,120页

作者：陈佳孟闫祯平令文师艳丽陈振宇中国矿业大学(北京)地球科学与测绘工程学院北京100083 天津市滨海新区环境创新研究院天津300450

定量解析污染源是有效控制水污染的基础,研究综合利用数理统计、GIS空间分析和主成分分析-绝对主成分得分-多元线性回归模型(PCA-APCS-MLR)等方法,提出了一种数据预处理方式,对2018-2020年延安市地表水系内49个采样点的23项水质关键指... 详细信息

定量解析污染源是有效控制水污染的基础,研究综合利用数理统计、GIS空间分析和主成分分析-绝对主成分得分-多元线性回归模型(PCA-APCS-MLR)等方法,提出了一种数据预处理方式,对2018-2020年延安市地表水系内49个采样点的23项水质关键指标进行污染源及其贡献率定量分析。结果表明:污染源以营养物污染(54.02%)及重金属污染(17.97%)为主,营养物污染对各水质指标的平均贡献率(52.70%)大于重金属污染(47.30%),营养物污染主要对延安市东北部影响较大,重金属污染对延河、秀延河上游地区影响较大。相比原始数据预处理方法的分析结果,该结果更具有地区代表性,可对延安市地表水污染治理提供数据支持,为地表水水质保护政策的制定提供科学参考。

关键词：地表水水质污染源识别 PCA 多元线性回归模型枯水期

维普期刊数据库博看期刊

Urokinase-targeted recombinant bacterial protein toxins-a rationally designed and engineered anticancer agent for cancer therapy

在线全文

学校读者我要写书评

暂无评论

Frontiers in Biology 2009年第1期4卷 1-6页

作者： Yizhen liU shi-yan li Department of Biomedical Sciences Colorado State UniversityFont CollinsCO 80523USA Cancer Research Institute of Scott&White TempleTX 76502USA

Urokinase-targeted recombinant bacterial protein toxins are a sort of rationally designed and engineered anticancer recombinant fusion proteins representing a novel class of agents for cancer *** protein toxins have long been known as the primary virulence factor(s)for a variety of pathogenic bacteria and are the most powerful human *** the other hand,it has been well documented that urokinase-type plasminogen activator(uPA)and urokinase plasminogen activator receptor(uPAR),making up the uPA system,are overexpressed in a variety of human tumors and tumor cell *** expression of uPA system is highly correlated with tumor invasion and *** exploit these characteristics in the design of tumor cell-selective cytotoxins,two prominent bacterial protein toxins,i.e.,the diphtheria toxin and anthrax toxin are deliberately engineered through placing a sequence targeted specifically by the uPA system to form anticancer recombinant fusion *** uPA system-targeted bacterial protein toxins are activated selectively on the surface of uPA systemexpressing tumor cells,thereby killing these *** article provides a review on the latest progress in the exploitation of these recombinant fusion proteins as potent tumoricidal *** is perceptible that the strategies for cancer therapy are being innovated by this novel therapeutic approach.

关键词： urokinase-type plasminogen activator(uPA) diphtheria toxin anthrax toxin recombinant fusion proteins cancer therapy

Corrosion resistance of steel materials in liCl-KCl melts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2012年第10期19卷 930-933页

作者： Le Wang Bing li Miao Shen shi-yan li Jian-guo Yu National Engineering Research Center for Integrated Utilization of Salt Lake Resource East China University of Science and TechnologyShanghai 200237China

The corrosion behaviors of 304SS, 316LSS, and Q235A in liCl-KCl melts were investigated at 450℃ by Tafel curves and elec- trochemical impedance spectroscopy （EIS）. 316LSS shows the best corrosion resistance behaviors among the three materials, including the most positive corrosion potential and the smallest corrosion current from the Tafel curves and the largest electron transfer resistance from the Nyquist plots. The results are in good agreement with the weight losses in the static corrosion experiments for 45 h. This may be attributed to the better corrosion resistance of Mo and Ni existing as alloy elements in 316LSS, which exhibit the lower corrosion current densities and more positive corrosion potentials than 316LSS in the same melts.

关键词： stainless steel molten salts corrosion resistance lithium electrolysis

Microstructure and Mechanical Properties of High Manganese TRIP Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2012年第4期19卷 57-62页

作者： ZHAO Jin-long XI yan shi Wen li lin College of Material Science and Engineering Shanghai University Shanghai 200072 China

Microstructure evolution and mechanical properties of newly designed 0.1C-6Mn-0.5Si-1Al TRIP-aided steels under different annealing conditions and the effects of matrix microstructure before intercritical annealing on the final microstructure were studied by means of X-ray diffraction（XRD）,scanning electron microcopy（SEM）,dilatometric simulation,optical microstructure（OM） and tensile testing in this *** experimental results indicate that the TRIP steel with Mn of 6% could form a considerable amount of retained austenite with good TRIP effect after a simple intercritical annealing treatment,and the matrix microstructure before intercritical annealing treatment can greatly affect the final *** original microstructure of the ferritic matrix steel was eliminated,while annealed martensite was remained from the martensite matrix steel under the same intercritical annealing conditions

关键词： high manganese TRIP steel intercritical annealing microstructure mechanical properties

超声引导下神经阻滞治疗带状疱疹后遗神经痛的疗效分析

在线全文

学校读者我要写书评

暂无评论

安徽医专学报 2024年第3期23卷 28-30页

作者：施丽岩李家明屠殿奇北京市通州区中西医结合医院北京100110

目的:探究超声引导下神经阻滞治疗带状疱疹后遗神经痛的近期疗效、可能作用机制以及对数字疼痛评分(NRS)、匹兹堡睡眠质量指数(PSQI)评分的影响。方法:选取某院收治的84例带状疱疹后遗神经痛患者。根据治疗方案进行分组,仅接受普瑞巴林... 详细信息

目的:探究超声引导下神经阻滞治疗带状疱疹后遗神经痛的近期疗效、可能作用机制以及对数字疼痛评分(NRS)、匹兹堡睡眠质量指数(PSQI)评分的影响。方法:选取某院收治的84例带状疱疹后遗神经痛患者。根据治疗方案进行分组,仅接受普瑞巴林治疗的38例患者为对照组,接受普瑞巴林联合超声引导下椎旁神经阻滞治疗的46例患者为观察组。比较两组患者的临床疗效、疼痛程度、睡眠质量、生活质量、免疫功能指标以及不良反应发生情况。结果:两组患者治疗前各指标差异均无统计学意义(P>0.05)。治疗后,相较于对照组,观察组患者临床总有效率、生活质量评分、免疫球蛋白G(IgG)、IgA以及IgM水平均明显升高(P<0.05);NRS、PSQI评分以及不良反应总发生率均明显下降(P<0.05)。结论:超声引导下神经阻滞治疗带状疱疹后遗神经痛,临床疗效显著,能有效改善患者的疼痛程度、睡眠质量以及生活质量,提高患者免疫功能,同时降低不良反应发生率,值得临床推广应用。

关键词：神经阻滞带状疱疹后遗神经痛 NRS评分 PSQI评分

Repeated lumps and infections: A case report on breast augmentation complications

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2019年第20期7卷 3322-3328页

作者： Ming-Xuan Zhang shi-yan li li-Long Xu Bo-Wen Zhao Xiao-yan Cai Guang-Lan Wang Department of Diagnostic Ultrasound and Echocardiography Sir Run Run Shaw HospitalZhejiang University College of MedicineHangzhou 310016Zhejiang ProvinceChina General Surgical Department Sir Run Run Shaw HospitalZhejiang University College of MedicineHangzhou 310016Zhejiang ProvinceChina Pathology Department Sir Run Run Shaw HospitalZhejiang University College of MedicineHangzhou 310016Zhejiang ProvinceChina

BACKGROUND Polyacrylamide hydrogel(PAAG)injections were once common in breast augmentation and have been prohibited for augmentation mammaplasty in China since a large number of patients who underwent breast augmentation with PAAG injections have continued to seek medical advice as a result of related *** all these complications,distant migration is relatively *** SUMMARY A 49-year-old female presented at the hospital with a one-year history of a vulvar *** sonography of the lump showed several subcutaneous fluid-filled regions from the left vulva to the pubic symphysis,which suggested possible fat *** enhanced magnetic resonance imaging(MRI)revealed a cystic area,which was considered a benign *** observations showed that the mass did not have an obvious capsule,the subcutaneous tissue presented as a cavity,and some yellow material came out of this cavity.A culture of the drainage did not show bacterial *** revealed a foreign body *** resection and closed drainage,lumps were successively observed in the left lower abdomen and the bilateral hypochondriac region with *** found that the hypoechoic areas in the bilateral hypochondriac region seemed continuous with deep in the *** patient reported that she had undergone surgery with PAAG injections 20 years ago after she was repeatedly asked about her past ***,a diagnosis of distant migration of PAAG was *** PAAG gel can migrate after long periods of time.A diagnosis should not be limited to the area where the symptom develops.

关键词： Breast augmentation Distant migration Repeated lump Repeated infection Case report

Influence of rare earth oxides on microstructure and mechanical properties of nickel-based superalloys fabricated by high energy beam processing:A review

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 Rare Earths 2024年第9期42卷 1629-1645,I0001页

作者： lianjie Bi Hua yan Peilei Zhang Haichuan shi Zhiyuan li Ruidi li School of Materials Science and Engineering Shanghai University of Engineering ScienceShanghai201620China College of Agricultural Science and Engineering Hohai UniversityNanjing211100China Department of Mechanics and Maritime Science Chalmers University of TechnologyGothenburSE41296Sweden State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China

In this paper,the effects of rare earth oxides on the micro structure and mechanical properties of nickelbased superalloys prepared by high-energy beam processing technology were critically *** focus is on the optimal amount of rare earth oxides that can produce ideal *** attention was paid to their main strengthening mechanisms,including solid solution strengthening mainly in the form of solid solution dissolved in the nickel-based alloy and improving the microstructure of the alloy by grain refinement or fine grain strengthening produced by homogenizing the distribution phase.Y_(2)O_(3),La_(2)O_(3) and CeO_(2) rare earth oxides can also improve the fluidity of the alloy molten pool and reduce the segregation of alloying *** advantages can significantly improve the mechanical properties of the ***,this paper outlines the future research directions of rare earth oxides,aiming to expand their application potential.

关键词： Rare earths High energy beam Nickel-based superalloys Microstructure Mechanical properties

Controlled Phase Gate Based on an Electron Floating on Helium

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第5期28卷 20-21页

作者： shi yan-li MEI Feng YU Ya-Fei ZHANG Zhi-Ming Key laboratory of Photonic Information Technology of Guangdong Higher Education Institutes SIPSE and LQITSouth China Normal UniversityGuangzhou 510006

We propose a scheme to generate the controlled phase gate by using an electron floating on liquid *** electron is also driven by a classical laser beam and by an oscillating magnetic *** the process,the vibration of the electron is used as the qubus to couple the energy level qubit(1D Stark-shifted hydrogen)and spin ***,the controlled phase gate can be generated.

关键词： field oscillating Electron

A highly sensitive multiple-mode optical thermometer designed in Eu^(2+/3+)and li^(+)co-doped polymorphism compound LaSc_(3)(BO_(3))_(4)

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 Advanced Ceramics 2024年第6期13卷 821-833页

作者： Nan yang Zhuo li Tingxia Zhou Ziwang Zhang Wen shi Yexiang Tong Jianxin shi School of Chemistry IGCMESun Yat-sen UniversityGuangzhou 510006China MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry IGCMEThe Key Lab of Low-Carbon Chemistry&Energy Conservation of Guangdong ProvinceSun Yat-sen UniversityGuangzhou 510006China

Noncontact optical thermometers have attracted widespread attention,but existing problems such as single-mode and low-sensitivity thermometers still urgently need to be ***,a novel multiple-mode thermometer was designed for the polymorphism LaSc_(3)(BO_(3))_(4):Eu^(2+/3+),li^(+).X-ray diffraction(XRD)patterns revealed a slight transition betweenα-andβ-phases with the concentrations of the dopants,which is further proved by structure refinements and first-principles *** coexistence of Eu^(2+)and Eu^(3+)in the phosphors and their relative percentages were confirmed by X-ray absorption near-edge structure(XANES)*** from appropriate emissions from Eu^(2+)and Eu^(3+)without obvious energy transfer and their opposite changing trends with temperatures under 307 nm excitation,a triple-mode optical thermometer is obtained for this material within the temperature range of 150–450 *** highest sensitivities of 27.65,14.05,and 7.68%·K^(−1)are achieved based on two fluorescence intensity ratio(FIR)modes of Eu^(2+)and Eu^(3+)(5d–4f/^(5)D_(0)–^(7)F_(2,4))and the fluorescence lifetime(FL)mode of Eu^(2+),*** the best of our knowledge,the former is almost the highest in Eu^(2+)and Eu^(3+)co-doped *** results indicate that this material may be used as an excellent multiple-mode optical thermometer.

关键词： phase transition europium(Eu)ions multiple-mode optical thermometer thermal quenching properties fluorescence intensity ratio(FIR) fluorescence lifetime(FL)