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Effect of deteriorated microstructures on stress corrosion cracking of X70 pipeline steel in acidic soil environment

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Journal of University of Science and Technology Beijing 2008年第6期15卷 707-713页

作者： Zhiyong liu guoli Zhai Xiaogang Li Cuiwei Du Corrosion and Protection Center University of Science and Technology Beijing Beijing 100083 China

In order to investigate stress corrosion cracking （SCC） of X70 pipeline steel and its weld joint area in acidic soil environ- ment in China, two simulating methods were used： one was to obtain bad microstructures in heat affected zone by annealing at 1300 ℃ for 10 min and then, quenching in water; the other was to get different simulating solutions of acidic soil in Yingtan in south- east China. The SCC susceptibilities of X70 pipeline steel before and after quenching in the simulating solutions were analyzed using slow stain rate test （SSRT） and potentiodynamic polarization technique to investigate the SCC electrochemical mechanism of different microstructures further. The results show that SCC appears in the original microstructure and the quenched microstructure as the polarization potential decreases. Hydrogen revolution accelerates SCC of the two tested materials within the range of-850 mV to -1200 mV vs. SCE. Microstructural hardening and grain coarsening also increase SCC. The SCC mechanisms are different, anodic dissolution is the key of causing SCC as the polarization potential is higher than the null current potential, and hydrogen embrittlement will play a more important role to SCC as the polarization potential lower than the null current potential.

关键词： X70 steel heat affected zone heat treatment stress corrosion cracking (SCC) acidic soil environment

Deep vein thrombosis in early pregnancy:A retrospective study

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Gynecology and Obstetrics Clinical Medicine 2023年第1期3卷 44-50页

作者： Chen Zhang Xuemin Zhang guoli liu Department of Obstetrics and Gynecology Peking University People’s HospitalBeijing100044China Department of Vascular Surgery Peking University People’s HospitalBeijing100044China

Objective:To investigate the clinical characteristics,management,and prognosis of deep vein thrombosis(DVT)during early ***:We conducted a retrospective study among women with DVT during their first trimester of pregnancy who were admitted to the obstetrics department of Peking University People's Hospital between March 2008 and May *** analyzed clinical data of eight patients,including their general condition,obstetric characteristics,diagnosis,treatment,and gestational ***:Risk factors for DVT in the first trimester included personal history of DVT,thrombophilia and immune diseases,and DVT was more likely to affect the left *** main manifestation of DVT was pain or swelling of the affected limbs.D-dimer levels after anticoagulant treatment showed a downward trend compared with those before treatment(P=0.09),while D-dimer levels increased significantly after delivery compared with those before delivery(P=0.03).All the patients started on low-molecular-weight heparin(LMWH)therapy after a diagnosis of *** inferior vena cava(IVC)filters were implanted in 3 patients with mixed thrombosis before delivery,but were removed after the *** for 1 case with thrombophilia who refused treatment,others underwent anticoagulation therapy from 6 weeks to 1 year *** patients achieved a successful delivery with live ***:During early pregnancy,DVT was more common in women with maternal risk *** cases of venous thromboembolism(VTE)were observed in the left *** women with a high risk of DVT,medical intervention,early identification,accurate diagnosis and precise treatment during early pregnancy should be promoted.

关键词： Early pregnancy Deep vein thrombosis Clinical characteristics Diagnosis Treatment Prognosis

Nursing discharge teaching of hospitalized postpartum women in China:A cross-sectional study

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Gynecology and Obstetrics Clinical Medicine 2023年第4期3卷 236-240页

作者： Sen Li Yan liu guoli liu Department of Obstetrics and Gynecology Peking University People's HospitalBejingChina

Background:Postpartum women encounter a diverse array of physiological challenges following childbirth,and they may also contend with issues such as a lack of self-care knowledge childcare knowledge,and childcare *** study aimed to explore the quality of discharge teaching for hospitalized postpartum ***:A total of 292 parturients who gave birth in a tertiary hospital were selected using the convenience sampling method and surveyed using a general data questionnaire and discharge teaching quality ***:The total score for the quality of discharge teaching was 111.95±*** bivariate analysis,significant differences were identified between postpartum women with differences in postpartum complications,ambulation time,wound pain,infant health status,and infant feeding methods(p<0.05).Wound pain and infant feeding methods were significant factors in a multiple linear regression model(p<0.05).Conclusions:Nursing staff should focus on psychological nursing care and give more personalized teaching to postpartum women with severe wound pain and who bottle feed their newborns.

关键词： Postpartum women Quality of discharge teaching Nursing care

Chinese expert consensus on fertility-preserving treatment for young women with early stage well differentiated endometrial cancer

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Gynecology and Obstetrics Clinical Medicine 2021年第1期1卷 49-53页

作者： Rong Zhou Qun Lu guoli liu Yiqin Wang Jianliu Wang Peking University People's Hospital Expert Committee of Obstetrics and Gynecology of the Chinese Research Hospital AssociationChina

For young women with early stage well differentiated endometrial cancer who have fertility desire,it is import to give comprehensive assessment before initiation of conservative *** based therapy with regular assessment of treatment efficacy can achieve a promising *** complete remission patients are suggested with assisted reproductive technology or maintenance therapy depending on their immediate pregnancy *** is recommended for patients who have finished reproduction while re-treatment for recurrent cases should be carefully informed.

关键词： Fertility-preserving treatment Young women Endometrial cancer Progesterone

Research on the Status Quo of the Curriculum of Public Physical Education in High Schools

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Journal of Contemporary Educational Research 2020年第2期4卷 50-53页

作者： guoli liu Wuhan Institute of Physical Education Wushu CollegeWuhan 430079China

With the advancement of high-quality education,the importance of physical education courses has been ***,the teaching of sports which mainly teaches students’sports skills has mandatory learning *** the development and improvement of the physical education curriculum,the current public physical education curriculum in high schools is considered more scientific in terms of teaching content and form,focusing on the cultivation of students’interest in learning,and improving the students’various abilities and physical *** article mainly analyzes the status quo of the curriculum of public physical education in high schools and proposes corresponding countermeasures.

关键词： High schools Public physical education curriculum Setting status quo

Enlarging ovarian cysts mimicking malignant or borderline tumors during pregnancy

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Gynecology and Obstetrics Clinical Medicine 2021年第4期1卷 228-232页

作者： Yibo Dai guoli liu Yan Wang Jun Wei Zhiqi Wang Jianliu Wang Department of Obstetrics and Gynecology Peking University People's HospitalBeijingChina

Background:Ovarian cysts are uncommon gestational *** of high-level progesterone,ovarian endometriomas may undergo decidualization during pregnancy,manifesting as enlarging cysts with papillae and rich blood *** cases can mimic malignant or borderline tumors,causing dilemmas in clinical ***,we present two cases of enlarging ovarian cysts during pregnancy with evidence suggesting decidualized *** diagnosis and treatment are further discussed,which add to our limited knowledge and might help future clinical *** summary:In the first case,a right ovarian cyst was detected by ultrasound in a 32-year-old pregnant *** cyst measured 4.2 cm in diameter at 7t6 weeks of gestation,and gradually increased to 9.6 cm7.6 cm5.6 cm at 37t5 weeks,with multiple solid papillae lining the inner *** cesarean section,an ovarian mass of approximately 9 cm in diameter was surgically removed,which was later identified by pathological review as an endometrioma with *** second case also presented as an enlarging ovarian mass during the first and second *** size of the cyst peaked at 24t5 weeks of gestation,measuring 6.9 cm5.6 cm4.1 *** in the third trimester,the tumor slightly *** follow-up was adopted after successful vaginal delivery,and the cyst was found to have undergone quick regression shortly after *** patients recovered well after delivery with no further ***:Endometriomas with decidualization during gestation may resemble borderline or malignant *** monitoring and proper management are essential for guiding clinical management.

关键词： Ovarian cyst Pregnancy Pregnancy complication Endometrioma Decidualization Case report

The lepton flavor violating signal of the extra gauge boson Z′in photon-photon collision at the ILC

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Science China(Physics,Mechanics & Astronomy) 2010年第11期53卷 1992-1997页

作者： liu guoli 1,2 1 Physics Department,Zhengzhou University,Zhengzhou 450001,China 2 Kavli Institute for Theoretical Physics China,Chinese Academy of Sciences,Beijing 100190,China 1. Physics Department Zhengzhou University Zhengzhou 450001 China2. Kavli Institute for Theoretical Physics China Chinese Academy of Sciences Beijing 100190 China

The hitherto unconstrained lepton flavor mixings,induced by the new gauge boson Z ,which are the prediction of many new physics models,such as topcolor-assisted technicolor (TC2) models and flavor-universal TC2 models,may lead to the lepton flavor violating productions of τμˉ,τeˉ and μeˉ in photon-photon collision at the proposed International Linear Collider (ILC).Through a comparative analysis of these processes,we find that the better channel to probe the new physics models is the production of τμˉ or τeˉ which occurs at a much higher rate than μeˉ production due to the large mixing angle and the large flavor changing coupling,and may reach the detectable level of the ILC for a large part of the parameter *** the rates predicted by the Standard Model are far below the detectable level,these processes may serve as a sensitive probe for such new physics models.

关键词： new gauge boson Z lepton flavor violating processes photon-photon

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铝合金熔模铸造技术现状及发展

特种铸造及有色合金 2010年第1期30卷 72-74页

作者：刘国利北京航空材料研究院

简要介绍了铝合金熔模铸造发展趋势、熔模和铸型制备技术、铝合金熔炼技术、铸件成形技术,特别是反重力铸造技术,提出了铝合金熔模铸造进一步的研究方向。

关键词：铝合金熔模铸造反重力铸造

Self-aligned Coupled Waveguide Distributed Bragg Reflector Lasers

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Chinese Journal of Lasers 2002年第2期11卷 9-12页

作者： liu guoli WANG Wei ZHU Hongliang ZHANG JingyuanHU Xiaohua LU Yu ZHANG Jing(National Research Center for Optoelectronic Technology, Institute of Semiconductors, The Chinese Academy of Sciences, Beijing 100083, China) National Research Center for Optoelectronic Technology，Institute of Semiconductors The Chinese Academy of Sciences 北京 100083

A novel self-aligned coupled waveguide (SACW) multi-quantum-well (MQW) distributed Bragg reflector (DBR) laser is proposed and demonstrated for the first time. By selectively removing the MQW layer and leaving the low SCH/SACW layer the Bragg grating is partially formed on this layer. By optimizing the thickness of the low SCH/SACW layer, a-80% coupling efficiency between the MQW gain region and the passive region are obtained. The typical threshold current of the SACW DBR laser is 39 mA, the slope efficiency can reach to 0.2 mW/mA and the output power is more than 20 mW with a more than 30dB side mode suppression ratio.

关键词： DBR laser MQW self-aligned coupled waveguide high power