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Microstructure,wetting property of Sn-Ag-Cu-Bi-xCe solder and IMC growth at solder/Cu interface during thermal cycling

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Rare Metals 2021年第3期40卷 714-719页

作者： Yuan Wang Xiu-Chen Zhao Ying liu Yong Wang dong-mei li School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Center of Packaging and Testing Beijing Microelectronics Technology InstituteBeijing 100076China

The effects of adding small amounts of cerium(Ce) to Sn-3.3 Ag-0.2 Cu-4.7 Bi solder on microstructure,wettability characteristic,interfacial morphology and the growth of interfacial intermetallic compound(IMC) during thermal cycling were investigated by optical microscopy(OM),scanning electron microscopy(SEM) and solderability *** is found that the p-Sn phase,Ag_(3)Sn phase and Cu6 Sn5 phase in the solder are refined and the wetting force *** is an active element;it more easily accumulates at the solder/flux interface in the molten state,which decreases the interfacial surface energy and reduces the driving force for IMC formation on Cu substrate;therefore,the thickness of IMC at the solder/Cu interface decreases when appropriate Ce was added into the ***,the Ce-containing solders have lower growth rate of interfacial IMC than solders without Ce during the thermal cycling between-55 and 125℃.When the Ce content is 0.03 wt% in the Sn-3.3 Ag-0.2 Cu-4.7 Bi solder,the solder has the best wettability and the minimum growth rate of interfacial IMC layer.

关键词： Lead-free solder Rare earth element Microstructure Wettability Intermetallic compound Thermal cycling

Nasopharyngeal carcinoma with synchronous breast metastasis:A case report

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World Journal of Clinical Cases 2023年第23期11卷 5573-5579页

作者： Ye-Yan Lei dong-mei li Department of Surgery Guangdong Chinese Medicine Hospital Zhuhai BranchZhuhai 519015Guangdong ProvinceChina

BACKGROUND Recent reports have described cases of metachronous breast metastasis in patients with nasopharyngeal ***,no similar cases of synchronous breast metastasis have been reported,and evidence that can be used to support the clinical diagnosis of stage IV nasopharyngeal carcinoma in patients with concurrent breast metastasis remains ***,additional evidence is required to elucidate the clinical characteristics of this condition and aid in the development of optimal management *** SUMMARY We report the case of a 46-year-old woman who visited our hospital with a right breast mass as the first *** first pathological biopsy report suggested triple-negative breast invasive *** imaging revealed a nasopharyngeal *** puncture biopsy of the nasopharyngeal mass,molecular pathological Epstein–Barr virus in situ hybridization,and immunohistochemistry confirmed the diagnosis of nasopharyngeal carcinoma with breast *** patient did not undergo a mastectomy and achieved complete remission after chemotherapy and *** continued to receive oral chemotherapy as maintenance therapy and experienced no recurrence or metastasis during the 6-month follow-up *** This case report suggests that breast specialists should carefully rule out secondary breast cancers when diagnosing and treating breast ***,clinicians should aim to identify the pathological type of the tumor to obtain the most accurate diagnosis and prevent excessive diagnosis and treatment.

关键词： Nasopharyngeal carcinoma Concurrent breast metastasis Chemoradiotherapy Cancer Pathology Case report

Malignant syphilis accompanied with neurosyphilis in a malnourished patient: A case report

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World Journal of Clinical Cases 2019年第16期7卷 2406-2412页

作者： Gai Ge dong-mei li Ying Qiu Hong-Jun Fu Xiang-Yu Zhang dong-mei Shi Jining Medical University Jining 272067Shandong ProvinceChina Georgetown University Medical Center WashingtonDC 20057United States Department of Dermatology Jining No. 1 People’s HospitalJining 272067Shandong ProvinceChina Department of Pathology Jining No. 1 People’s HospitalJining 272067Shandong ProvinceChina Department of Dermatology and Laboratory of Medical Mycology Jining No. 1 People’s HospitalJining 272067Shandong ProvinceChina

BACKGROUND Syphilis is a common sexually transmitted disease caused by the Treponema pallidum (***).Malignant syphilis is a rare presentation of secondary ***,we present a case diagnosed with malignant syphilis accompanied with *** SUMMARY A 56-year-old man present with a 2-mo history of spreading ulcerous and necrotic papules and nodules covered with thick crusts over the face,trunk,extremities,and *** patient was diagnosed with malignant syphilis accompanied by neurosyphilis based on the characteristic morphology of the lesions,positive serological and cerebrospinal fluid tests for syphilis,brain magnetic resonance imaging,and histopathology,along with resolution of the lesions following the institution of penicillin *** lesions and neurological condition successfully resolved after a course of treatment with *** We suggest that neurosyphilis should be considered whenever people have psychiatric symptoms without cutaneous lesions or human immunodeficiency virus.

关键词： Malignant syphilis Secondary syphilis Neurosyphilis Jarisch-Herxheimer reaction Case report

Synthesis and insecticidal activities of novel bridged-neonicotinoids

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Chinese Chemical Letters 2017年第8期28卷 1743-1745页

作者： dong-dong Zhang Shu-Xia Cui Zhi-Ping Xu dong-mei li Zhong-Zhen Tian Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials School of Chemistry and Chemical Engineering University of Jinan Shanghai Key Laboratory of Chemical Biology School of Pharmacy East China University of Science and Technology

A series of novel bridged-neonicotinoid analogues were designed and synthesized, which were constructed by starting material 8 with cyclopentenone or cyclohexenone in the presence of catalyst aluminium chloride. All of the compounds were characterized and confirmed by^1H NMR,^（13）C NMR, HRMS and IR. The bioassay tests showed that compounds 5 and 6a showed higher bioactivities than imidacloprid against Aphis craccivora.

关键词： Neonicotinoid Bridged compound Insecticidal activity Michael addition Resistance

Density Functional Theory Study on La Complex with Schiff-base as Building Block

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Chinese Journal of Structural Chemistry 2006年第2期25卷 197-203页

作者： XIA Shu-Wei XU Xiang SUN Ya-li FAN Yu-Hua BI Cai-Feng ZHANG dong-mei YANG li-Rong Department of Chemistry Ocean University of China Qingdao 266003 China

Quantum density functional theory （DFT） results are reported for the building block [LaL^1（NO3）] of La complex [LaL^1（NO3）]NO3·5H2O （L^1 = （CH3）2CHCH2CH（NCHC4H3O）COO^-）. The structure was optimized and the calculation results show that the lanthanum ion is coordinated by one nitrogen atom and three oxygen atoms of L^1 and two oxygen atoms of nitrate ion. The bond length of La-N is 0.2637 nm and the average length of La-O is 0.2526 nm, which are consistent with the literatures. In addition, the stabilities, electronic structural characteristics and IR spectra of the complex have been analyzed, which describe the coordination of lanthanum ion with other atoms in detail.

关键词： rare-earth Schiff-base lanthanum complex density functional theory

A New Cu-Based Metallic Glass Composite with Excellent Mechanical Properties

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Chinese Physics Letters 2020年第8期37卷 68-71页

作者： dong-mei li Lan-Sheng Chen Peng Yu Ding Ding Lei Xia Chongqing Key Laboratory of Photo-Electric Functional Materials College of Physics and Electronic EngineeringChongqing Normal UniversityChongqing 401331China Laboratory for Microstructure&Institute of Materials Shanghai UniversityShanghai 200072China

A new Cu-based bulk metallic glass composite of nominal composition(at.%)Cu41Ni27Ti25Al7 with excellent plasticity and a strong work-hardening behavior is *** above 1859 MPa and plasticity more than 11%are achieved under compression and tension *** deformation mechanism is proposed to the structural heterogeneities of the composite that promotes multiple shear bands meanwhile inhibits their free propagation,which results in the macroscopically plastic strain and work *** alloy contains relatively cheap metals and has a low cost,which is beneficial to industrial applications.

关键词： alloy deformation composite

MAWBP and MAWD inhibit proliferation and invasion in gastric cancer

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World Journal of Gastroenterology 2013年第18期19卷 2781-2792页

作者： dong-mei li Jun Zhang Wen-mei li Jian-Tao Cui Yuan-Ming Pan Si-Qi liu Rui Xing You-Yong Lu Laboratory of Molecular Oncology Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education) Peking University Cancer Hospital/Institute Department of Biochemistry and Molecular Biology School of Medicine Shihezi University Beijing Institute of Genomics Chinese Academy of Sciences

AIM: To investigate role of putative mitogen-activated protein kinase activator with WD40 repeats (MAWD)/ MAWD binding protein (MAWBP) in gastric cancer (GC). METHODS: MAWBP and MAWD mRNA expression level was examined by real-time reverse transcriptasepolymerase chain reaction and semi-quantitative polymerase chain reaction in six GC cell lines. Western blotting was used to examine the protein expression levels. We developed GC cells that stably overexpressed MAWBP and MAWD, and downregulated expression by RNA interference assay. Proliferation and migration of these GC cells were analyzed by 3-(4,5-dimethyl2-thiazolyl)-2,5-diphenyl tetrazolium bromide (MTT), soft agar, tumorigenicity, migration and transwell assays. The effect of expression of MAWBP and MAWD on transforming growth factor (TGF)-β1-induced epithelialmesenchymal transition (EMT) was examined by transfection of MAWBP and MAWD into GC cells. We detected the levels of EMT markers E-cadherin, N-cadherin and Snail in GC cells overexpressing MAWBP and MAWD by Western blotting. The effect of MAWBP and MAWD on TGF-β signal was detected by analysis of phosphorylation level and nuclear translocation of Smad3 using Western blotting and immunofluorescence. RESULTS: Among the GC cell lines, expression of endogenous MAWBP and MAWD was lowest in SGC7901 cells and highest in BGC823 cells. MAWBP and MAWD were stably overexpressed in SGC7901 cells and knocked down in BGC823 cells. MAWBP and MAWD inhibited GC cell proliferation in vitro and in vivo . MTT assay showed that overexpression of MAWBP and MAWD suppressed growth of SGC7901 cells (P < 0.001), while knockdown of these genes promoted growth of BGC823 cells (P < 0.001). Soft agar colony formation experiments showed that overexpression of MAWBP and MAWD alone or together reduced colony formation compared with vector group in SGC7901 (86.25±8.43, 12.75±4.49, 30±6.41 vs 336.75±22.55, P < 0.001), and knocked-down MAWBP and MAWD demonstrated opposite effects (131.25±16.

关键词： Gastric cancer Mitogen-activated protein kinase activator with WD40 repeats binding protein Mitogen-activated protein kinase activator with WD40 repeats Invasion Transforming growth factor-β Epithelial-mesenchymal transition

Rushan earthquake swarm in eastern China and its indications of fluid-triggered rupture

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Earthquake Science 2017年第5期30卷 239-250页

作者： Jian-Chang Zheng dong-mei li Cui-Qin li Peng Wang Chang-Peng Xu Institute of Seismology Chung Cheng UniversityChiayiTaiwanChina Shandong Earthquake Agency China Earthquake AdministrationJi'nanChina

An extraordinary earthquake swarm occurred at Rushan on the Jiaodong Peninsula from October 1, 2013, onwards, and more than 12,000 aftershocks had been detected by December 31, 2015. All the activities of the whole swarm were recorded at the nearest station, RSH, which is located about 12 km from the epicenter. We examine the statistical characteristics of the Rushan swarm in this paper using RSH station data to assess the arrival time difference, ts p, of Pg and Sg phases. A temporary network comprising 18 seismometers was set up on May 6, 2014, within the area of the epicenter; based on the data from this network and use of the double difference method, we determine precise hypocenter locations. As the distribution of relocated sources reveals migration of seismic activity, we applied the mean-shift cluster method to perform clustering analysis on relocated catalogs. The results of this study show that there were at least 16 clusters of seismic activities between May 6, 2014, and June 30, 2014, and that each was characterized by a hypocenter spreading process. We estimated the hydraulic diffusivity, D, of each cluster using envelope curve fitting; the results show that D values range between 1.2 and 3.5 m2/d and that approximate values for clusters on the edge of the source area are lower than those within the central area. We utilize an epidemic-type aftershock sequence （ETAS） model to separate external triggered events from self-excited aftershocks within the Rushan swarm. The estimated parameters for this model suggest that α = 1.156, equiva- lent to sequences induced by fluid-injection, and that the forcing rate （μ） implies just 0.15 events per day. These estimates indicate that around 3% of the events within the swarm were externally triggered. The fact that variation in μ is synchronous with swarm activity implies that pulses in fluid pressure likely drove this series of earthquakes.

关键词： Earthquake swarm ·Fluid triggered Clusteranalysis ETAS model

Efficient removal of Co(Ⅱ)from aqueous solution by titanate sodium nanotubes

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Nuclear Science and Techniques 2016年第6期27卷 115-124页

作者： dong-mei li Fei-Ze li Jia-li liao Ji-Jun Yang Bing li Yun-Ming Chen Yuan-You Yang Jin-Song Zhang Jun Tang Ning liu Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China Nuclear Power Institute of China Chengdu 610041China

In this paper,a novel material for Co(Ⅱ)adsorption,titanate sodium nanotubes(Na_2Ti_2O_5-NTs)were synthesized and characterized,and then they were used to remove Co(Ⅱ) from aqueous solution and compared with titanic acid nanotubes(H_2Ti_2O_5-NTs) and potassium hexatitanate whiskers(K_2Ti_6O_(13)).The results showed that the adsorption of Co(Ⅱ) on the materials was dependent on p H values and was a spontaneous,endothermic ***,Na_2Ti_2O_5-NTs exhibited much more efficient ability to adsorb Co(Ⅱ) from aqueous solution,with the maximum adsorption capacity of 85.25 mg/***,Na_2Ti_2O_5-NTs could selectively adsorb Co(Ⅱ) from aqueous solution containing coexisting ions(Na^+,K^+,Mg^(2+),and Ca^(2+)).The results suggested that Na_2Ti_2O_5-NTs were potential effective adsorbents for removal of Co(Ⅱ) or cobalt-60 from wastewater.

关键词：钛酸纳米管钴(Ⅱ) 水溶液 CO(Ⅱ) 六钛酸钾晶须钠新型材料 CO吸附