检索结果-南通市图书馆

W, Mo, Co Co-diffusion on Steel with Different Carbon Content

在线全文

学校读者我要写书评

暂无评论

材料热处理学报 2004年第5B期25卷 688-691页

作者： zhangyan-mei LIZhong-hou LIUYan-ping XUZhong ResearchInstituteofSurfaceEngineering TaiyuanUniversityofTechnologyTaiyuanChina

Tungsten, molybdenum and cobalt were co-diffused into the surface of ingot, 20 steel, 45 steel and T8 steel by a double glow plasma surface alloying technique. Surface alloyed layers formed on ingot and 20 steel are composed of -Fe +(Fe,Co)7(W,Mo)6, which possess the same strong age-hardening ability as the metallurgical age-hardened high speed steel, the maximum hardness can reach 1100 HV0.o25 after ageing treatment. Surface alloyed layers formed on 45 steel and T8 steel are composed of M6C, hardness of which are over 1100-1400 HV0.o25- Alloyed layers formed on ingot and 20 steel possess good toughness. Alloyed layer of carbide type exhibits slightly brittleness.

关键词：碳含量表面铸合碳钢硬度脆性钼钴共扩散

在线全文

学校读者我要写书评

暂无评论

报废凝油剂在含油污水处理上的应用

防化研究 2024年第2期3卷 62-67页

作者：孙付兵张法恒刘丹丹胡张雁李晨 61699部队

我国凝油剂库存积压严重,当前以焚烧为主的处置方式造成资源浪费严重。本文利用报废凝油剂作为絮凝剂处理含油污水,可实现凝油剂的再利用,减少焚烧带来的污染。研究表明,凝油剂虽经超期储存,但其化学性质依然稳定,无明显变质;粒径虽变... 详细信息

我国凝油剂库存积压严重,当前以焚烧为主的处置方式造成资源浪费严重。本文利用报废凝油剂作为絮凝剂处理含油污水,可实现凝油剂的再利用,减少焚烧带来的污染。研究表明,凝油剂虽经超期储存,但其化学性质依然稳定,无明显变质;粒径虽变大但粉体未发生板结。将报废凝油剂用于含油污水絮凝除油,发现在含油污水体系中,凝油剂对油滴界面张力的降低和Zeta电位的中和作用不明显。这主要是凝油剂的长烷基侧链、铝-氧配位键与油滴亲和起到了絮凝作用。为了进一步提高凝油剂的除油效率,通过添加阳离子破乳剂组成复合絮凝剂,并对配比进行优化,有效降低了复合絮凝剂使用量,除油效率达到90%以上。

关键词：报废凝油剂异辛酸铝含油污水处理絮凝剂

Burst Mode Transmission in GPON

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2004年第2期11卷 66-71页

作者： LILiang-chuan zhangyan-gan LILing XUDa-xiong OpticalCommunicationsCenter BeijingUniversityofPostsandTelecommunicationsBeijing100876P.R.China

In this paper, a newly approved standard G.984 for Gigabit-capable Passive Optical Networks (GPON) is introduced. Technical challenges about high-speed burst-mode data transmission in GPON are discussed and key issues... 详细信息

关键词： GPON burst mode transmission optical network

Unravelling the critical role of surface Nafion adsorption in Ptcatalyzed oxygen reduction reaction by in situ electrical transport spectroscopy

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第11期65卷 2290-2298页

作者： Yamei Sun Jingyi Tian zhangyan Mu Bailin Tian Qiulan Zhou Cheng Liu Shengtang Liu Qiang Wu Mengning Ding Key Laboratory of Mesoscopic Chemistry of MOE State Key Laboratory of Analytical Chemistry for Life SciencesSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China

Solid-state ionic conductor is a vital part in all electrochemical energy conversion devices. As a widely-applied protonconducting polymer and stabilizer for electrode preparation, Nafion has key applications in electrochemical devices operated under acidic conditions. Specific adsorption of Nafion on the catalyst surface is considered to result in partial loss of intrinsic activity in reactions such as oxygen reduction reaction(ORR), due to its comprehensive occupation of active sites. Many in situ characterization methods such as voltammetric fingerprinting and spectroscopic approaches have been used to explore the dynamic adsorption of Nafion on the electrode surface. However, most of current efforts have been focused on the behaviors of Nafion itself, with little attention paid to its effects on the adsorption of surface intermediates. Here, we employed the in situ electrical transport spectroscopy(ETS) to investigate Nafion adsorption on Pt catalysts and its effects on the ORR *** findings suggest that specific adsorption of Nafion results in the increased coverage of oxygen intermediates with weaker adsorption strength, which in turn plays a critical role in the reaction selectivity. The successful application of ETS on the dynamic characterization of reaction intermediates provides a novel perspective for catalyst design in ORR-related applications in future sustainable chemistry.

关键词： electrical transport spectroscopy Nafion adsorption oxygen reduction reaction platinum hydrogen peroxide

Development and evaluation of the screening performance of a low-cost high-risk screening strategy for breast cancer

在线全文

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2022年第9期19卷 1375-1384页

作者： Yubei Huang Huan Wang zhangyan Lyu Hongji Dai Peifang Liu Ying Zhu Fengju Song Kexin Chen Department of Cancer Epidemiology and Biostatistics 2Department of Breast ImagingTianjin Medical University Cancer Institute and HospitalNational Clinical Research Center for CancerKey Laboratory of Cancer Prevention and Therapy of TianjinTianjin’s Clinical Research Center for CancerKey Laboratory of Cancer Molecular Epidemiology of TianjinKey Laboratory of Breast Cancer Prevention and TherapyMinistry of EducationTianjin 300060China

Objective:To develop and evaluate the screening performance of a low-cost high-risk screening strategy for breast cancer in low resource ***:Based on the Multi-modality Independent Screening Trial,6 questionnaire-based risk factors of breast cancer(age at menarche,age at menopause,age at first live birth,oral contraceptive,obesity,family history of breast cancer)were used to determine the women with high risk of breast *** screening performance of clinical breast examination(CBE),breast ultrasonography(BUS),and mammography(MAM)were calculated and compared to determine the optimal screening method for these high risk ***:A total of 94 breast cancers were detected among 31,720 asymptomatic Chinese women aged 45–65 *** to significantly higher detection rates(DRs)and suitable coverage of the population,high risk women were defined as those with any of 6 risk *** high risk women,the DR for BUS[3.09/1,000(33/10,694)]was similar to that for MAM[3.18/1,000(34/10,696)],while it was significantly higher than that for the CBE[1.73/1,000(19/10,959),P=0.002].Compared with MAM,BUS showed significantly higher specificity[98.64%(10,501/10,646)vs.98.06%(10,443/10,650),P=0.001],but no significant differences in sensitivity[68.75%(33/48)vs.73.91%(34/46)],positive prediction values[18.54%(33/178)vs.14.11%(34/241)],and negative prediction values[99.86%(10,501/10,516)vs.99.89%(10,443/10,455)].Further analyses showed no significant difference in the percentages of early stage breast cancer[53.57%(15/28)vs.50.00%(15/30)],lymph node involvement[22.73%(5/22)vs.28.00%(7/25)],and tumor size≥2 cm[37.04%(10/27)vs.29.03%(9/31)]between BUS and *** analyses stratified by breast densities or age at enrollment showed similar ***:The low-cost high-risk screening strategy based on 6 questionnaire-based risk factors was an easy-to-use method to identify women with high risk of breast ***,BUS and MAM had comparable screening

关键词： Cancer screening breast cancer high risk mammography ultrasonography

Charlie Soong and Wilmington

在线全文

学校读者我要写书评

暂无评论

China Today 2004年第12期53卷 58-60页

作者： zhangyan formerdeputyeditor-in-chiefofChinaToday

IN front of the Fifth Avenue Methodist Church in Wilmington, North Carolina stands a monument erected. in 1944 which reveals an unusual historic connection with China. The engraved plaque states that Charlie Jones Soong, father of the famous Soong family of modern China, converted to Christianity in this church on November 7, 1880.

关键词：美国卡罗莱纳州 Charlie Soong Wilmington 中国基督教

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

常见塑料的微生物降解研究进展

化学与生物工程 2024年第2期41卷 13-25页

作者：陈张燕郑燕虹刘湘晴李海玥夏丽杨坪萍李芹刘峰张怀东福建师范大学生命科学学院福建福州350117 工业微生物发酵技术国家地方联合工程研究中心福建福州350117

全世界每年都会产生大量的塑料,而塑料的难降解性以及回收率低导致塑料污染遍布全球。微塑料在环境中的持续积累,对生态系统和人类健康造成了严重威胁。简单介绍了塑料污染概况,综述了几种常见塑料(PE、PP、PVC、PET、PU、PS)的微生物... 详细信息

全世界每年都会产生大量的塑料,而塑料的难降解性以及回收率低导致塑料污染遍布全球。微塑料在环境中的持续积累,对生态系统和人类健康造成了严重威胁。简单介绍了塑料污染概况,综述了几种常见塑料(PE、PP、PVC、PET、PU、PS)的微生物降解研究进展,对几种常见塑料的降解菌和降解酶进行了总结,并指出了提高降解效率的有效途径。

关键词：塑料微生物降解酶

维普期刊数据库博看期刊

Improvement of Drought Tolerance in Transgenic Tobacco Plants by a Dehydrin-Like Gene Transfer

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2004年第8期3卷 575-583页

作者： SHENYe JIAWei-long zhangyan-qin HUYuan-lei WUQi LINZhongping NationalKeyLaboratoryofProteinEngineeringandPlantGeneEngineering PekingUniversityBeijing100871P.R.China ResearchCenterforDrought ShanxiAcademyofAgricultureSciencesTaiyuan030031P.R.China

A full-length cDNA of dehydrin BcDh2 from Boea crassifolia and its antisense nucleotidesequence have been transferred into tobacco (Nicotiana tabacum) NC89 under the controlof a caulifower mosaic virus 35S promoter. Under a progressive water stress, photosyntheticrate, transpiration rate and stomatal conductance of the sense and antisense plantsreduced, and those of the control reduced much more. Photosynthetic rate, transpirationrate and stomatal conductance of all plants tested increased significantly 24 hourslater after recoveried water supply, and those of the sense and antisense plants werehigher than control. These indicated that overexpression of a dehydrin gene in tobaccomay improve tolerance to water stress for plants, however, antisense BcDh2 gene intransgenic plant did not influence physiological conditions. The results of germinationexperiment of the transgenic seeds showed that on MS medium with different concentrationPEG (8000), sense seed could more endure drought than control, while antisense seed wassensitive to drought. The results suggested that the overexpression of a dehydrin genein tobacco might improve the tolerance to water stress for plants.

关键词： Dehydrin Sense Antisense Drought tolerance

Interaction between HLA-G and NK cell receptor KIR2DL4 orchestrates HER2-positive breast cancer resistance to trastuzumab

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2021年第7期6卷 2210-2224页

作者： Guoxu Zheng zhangyan Guo Weimiao Li Wenjin Xi Baile Zuo Rui Zhang Weihong Wen An-Gang Yang Lintao Jia State Key Laboratory of Cancer Biology Department of ImmunologyFourth Military Medical UniversityXi'anChina Department of Oncology The Second Affiliated Hospital of Xi’an Jiaotong UniversityXi’anChina State Key Laboratory of Cancer Biology Department of Biochemistry and Molecular BiologyFourth Military Medical UniversityXi’anChina

Despite the successful use of the humanized monoclonal antibody trastuzumab(Herceptin)in the clinical treatment of human epidermal growth factor receptor 2(HER2)-overexpressing breast cancer,the frequently occurring drug resistance remains to be *** regulatory mechanisms of trastuzumab-elicited immune response in the tumor microenvironment remain largely ***,we found that the nonclassical histocompatibility antigen HLA-G desensitizes breast cancer cells to trastuzumab by binding to the natural killer(NK)cell receptor *** engaged by HLA-G,KIR2DL4 promotes antibody-dependent cell-mediated cytotoxicity and forms a regulatory circuit with the interferon-γ(IFN-γ)production pathway,in which IFN-γ upregulates KIR2DL4 via JAK2/STAT1 signaling,and then KIR2DL4 synergizes with the Fey receptor to increase IFN-γ secretion by NK *** treatment of neoplastic and NK cells leads to aberrant cytokine production characterized by excessive tumor growth factor-β(TGF-β)and IFN-γ,which subsequently reinforce HLA-G/KIR2DL4 *** addition,TGF-β and IFN-γ impair the cytotoxicity of NK cells by upregulating PD-L1 on tumor cells and PD-1 on NK *** of HLA-G/KIR2DL4 signaling improved the vulnerability of HER2-positive breast cancer to trastuzumab treatment in *** findings provide novel insights into the mechanisms underlying trastuzumab resistance and demonstrate the applicability of combined HLA-G and PD-L1/PD-1 targeting in the treatment of trastuzumab-resistant breast cancer.

关键词： KIR2DL4 trastuzumab treatment