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Experimental and theoretical analysis of equilibrium segregation and radiation-induced segregation of Cr at grain boundariesin a reduced activation ferritic/martensitic(RAFM)steel

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Journal of Iron and Steel Research International 2021年第4期28卷 445-452页

作者： li-dong xia Hao Chen Zhi-gang Yang Chi Zhang Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Helium ion irradiation at 350℃was performed to study equilibrium segregation and radiation-induced segregation(RIS)of Cr at grain boundaries in reduced activation ferritic/martensitic *** concentration at grain boundary was measured by scanning transmission electron microscopy with an energy-dispersive *** measured Cr concentration at grain boundaries in heat treated zone was 11.7 and 12.8 wt.%in irradiated zone,respectively,which matched well to the calculated results from Mclean and modified Perk *** segregation and RIS of Cr mechanisms were theoretically *** analysis indicates that as temperature rises,equilibrium Cr segregation decreases monotoni-cally,while RIS of Cr has a bell-shape profile,which increases first and then *** is also shown that at low and high temperatures,equilibrium segregation of Cr is higher than that of RIS;at intermediate temperatures,equilibrium Cr segregation is lower than RIS.

关键词： Reduced activation ferritic/martensitic steel Equilibrium Cr segregation Radiation-induced segregation Grain boundary Rate theory Mclean equation

Influence of lactic acid bacteria, cellulase, cellulase-producing Bacillus pumilus and their combinations on alfalfa silage quality

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Journal of Integrative Agriculture 2018年第12期17卷 2768-2782页

作者： li dong-xia NI Kui-kui ZHANG Ying-chao liN Yan-li YANG Fu-yu College of Animal Science and Technology China Agricultural UniversityBeijing 100193P.R.China Beijing Sure Academy of Biosciences Beijing 100085P.R.China

This study assessed the effects of lactic acid bacteria(LAB), cellulase, cellulase-producing Bacillus pumilus and their combinations on the fermentation characteristics, chemical composition, bacterial community and in vitro digestibility of alfalfa silage. A completely randomized design involving a 8(silage additives)×3 or 2(silage days) factorial arrangement of treatments was adopted in the present study. The 8 silage additive treatments were: untreated alfalfa(control); two commercial additives(GFJ and Chikuso-1); an originally selected LAB(Lactobacillus plantarum a214) isolated from alfalfa silage; a cellulase-producing Bacillus(CB) isolated from fresh alfalfa; cellulase(C); and the combined additives(a214+C and a214+CB). Silage fermentation characteristics, chemical composition and microorganism populations were analysed after 30, 60 and 65 days(60 days followed by exposure to air for five additional days). In vitro digestibility was analysed for 30 and 60 days. Compared with the other treatments, selected LAB a214, a214 combined with either C or CB, and Chikuso-1 had the decreased(Pling process, and there were no differences(P>0.05) among them. Fiber degradation was not significant(P≥0.054) in any C or CB treatments. The a214 treatment showed the highest(P=0.009) in vitro digestibility of dry matter(595.0 g kg–1DM) after ensiling and the highest abundance of Lactobacillus(69.42 and 79.81%, respectively) on days 60 and 65, compared to all of other treatments. Overall, the silage quality of alfalfa was improved with the addition of a214, which indicates its potential as an alfalfa silage inoculant.

关键词： alfalfa silage cellulase fermentation quality invitro digestibility lactic acid bacteria

Damping and power spectra of quasi-periodic intensity disturbances above a solar polar coronal hole

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Research in Astronomy and Astrophysics 2016年第6期16卷 85-92页

作者： Fang-Ran Jiao li-dong xia Zheng-Hua Huang Bo li Hui Fu Ding Yuan Kalugodu Chandrashekhar Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space Sciences Shandong University Weihai 264209 Shandong China Jeremiah Horrocks Institute University of Central Lancashire Preston PR1 2HE UK

We study intensity disturbances above a solar polar coronal hole that can be seen in the AIA 171 and 193 ＆ passbands, aiming to provide more insights into their physical nature. The damping and power spectra of the intensity disturbances with frequencies from 0.07 mHz to 10.5 mHz are investigated. The damping of the intensity disturbances tends to be stronger at lower frequencies, and their damping behavior below 980＂（for comparison, the limb is at 945＂） is different from what happens above. No significant difference is found between the damping of the intensity disturbances in the AIA 171 ~ and that in the AIA 193 ]k. The indices of the power spectra of the intensity disturbances are found to be slightly smaller in the AIA 171/~ than in the AIA 193 ~, but the difference is within one standard deviation. An additional enhanced component is present in the power spectra in a period range of 8-40 min at lower heights. The power spectra of a spicule is highly correlated with its associated intensity disturbance, which suggests that the power spectra of the intensity disturbances might be a mixture of spicules and wave activities. We suggest that each intensity disturbance in the polar coronal hole is possibly a series of independent slow magnetoacoustic waves triggered by spicular activities.

关键词： Sun: corona- Sun: waves -- Sun: turbulence -- method: observational

Dynamic tracking and mobility analysis of single GLUT4 storage vesicle in live 3T3-L1 cells

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Cell Research 2004年第6期14卷 480-486页

作者： Chen Hong li, li BAI, dong dong li, Sheng xia, Tao XU Institute of Biophysics and Biochemistry, Huazhong University of Science and Technology, Wuhan 430074, China National Key Laboratory of Biomacromoleculars, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China Institute of Biophysics and Biochemistry Huazhong University of Science and Technology Wuhan 430074 China

Glucose transporter 4 (GLUT4) is responsible for insulin-stimulated glucose transporting into the insulin-sensitive fat and muscle cells. The dynamics of GLUT4 storage vesicles (GSVs) remains to be explored and it is unclear how GSVs are arranged based on their mobility. We examined this issue in 3T3-L1 cells via investigating the three-dimensional mobility of single GSV labeled with EGFP-fused GLUT4. A thin layer of cytosol right adjacent to the plasma membrane was illuminated and successively imaged at 5 Hz under a total internal reflection fluorescence microscope with a penetration depth of 136 nm. Employing single particle tracking, the three-dimensional subpixel displacement of single GSV was tracked at a spatial precision of 22 nm. Both the mean square displacement and the diffusion coefficient were calculated for each vesicle. Tracking results revealed that vesicles moved as if restricted within a cage that has a mean radius of 160 nm, suggesting the presence of some intracellular tethering matrix

关键词： Insulin GLUT4 GLUT4 storage vesicle (GSV) 3T3-L1 total internal reflection fluorescence microscopy single particle tracking.

A New Method for Monitoring Scattered Stray light of an Inner-occulted Coronagraph

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Research in Astronomy and Astrophysics 2024年第2期24卷 216-227页

作者： Da-Yang liu Hong-Xin Zhang Ming-Zhe Sun Zheng-Hua Huang li-dong xia Wei-Xin liu Hui Fu Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong UniversityWeihai 264209China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

The scattered stray light of a coronagraph is a type of stray light that is generated by the objective lens as its surface defects are irradiated by *** defects mainly include dust and blemishes on the lens surface,microroughness of the lens surface,and impurity and inhomogeneity of the *** the other types of relatively stable defects introduced when the objective lens is being manufactured,the scattered stray light caused by dusts on the lens surface is difficult to quantify accurately due to the disorder and randomness of the dust *** contribution of this type of stray light to the overall stray light level is difficult to determine through simulations and *** can result in continuous deterioration of the stray light level of a coronagraph and thus affect the observation capabilities of the *** solve this issue,through analyzing the forming mechanism of scattered stray light and ghost image generated by the inner-occulted coronagraph,we propose a novel method to monitor the scattered stray light from dusts by utilizing different stray light correlation *** this method,we first simulate and measure the level of stray light from the ghost image of the objective lens,and then determine the flux ratio of scattered light and ghost image on the conjugate *** the flux ratio varies with the accumulation of dusts on the lens surface,it remains constant on the image ***,the level of dust scattering light on the image plane can be obtained by using this ratio together with the level of ghost image stray *** accuracy of this method has been validated in a laboratory by applying the objective lens with numerous surface cleanliness levels.

关键词： Sun corona-Sun atmosphere-instrumentation miscellaneous-methods analytical-techniques image processing

Efficient synthesis of hydroxyl functioned polyesters from natural polyols and sebacic acid

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Chinese Chemical Letters 2011年第6期22卷 635-638页

作者： Zhuo Yuan Ning Qing Shan Zhang Qin Pei Wu Yun Zheng li dong xia Ma Jia Zhe Chen School of Chemical Engineering and Environment Beijing Institute of TechnologyBeijing 100081China

Amphiphilic hydroxyl functioned polyester（HFP） can be used as compatibilizers for blends of starch and *** developed a synthetic method for effective preparation of *** was removed by high flow rate N_2 rather than high vacuum during polycondensation of sebacic acid with xylitol,sorbitol,or mannitol in the presence of dehydrative condensation catalyst and the product is with[η]of 27.2 mL/g,M_n of 1903,M_w of 167,693,T_g of -30.5℃,T_m of 44.0℃.Weight loss is 1.73%under 200℃. The integral distributions of molecular weight are 43.6 wt%and 63.8 wt%over 10,000 and 3000,*** results indicated that higher molecular weight HFP was economically synthesized.

关键词： Hydroxyl functioned polyester Poly(sorbitol sebacate) Dehydrative condensation catalyst Biodegradable plastics

Pulmonary Embolism in Patients with Acute Exacerbation of Chronic Obstructive Pulmonary Disease

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Chinese Medical Journal 2018年第14期131卷 1732-1737页

作者： Yao-Qian Cao li-xia dong Jie Cao Department of Respiratory General Hospital Tianjin Medical University Tianjin 300052 China

Objective： In most cotintries, nearly 6% of the adults are suffering from chronic obstructive pulmonary disease （COPD）. which puts a huge economic burden on the society. Moreover, COPD has been considered as an independent risk factor for pulmonary embolism （PE）. In this review, we summarized the existing evidence that demonstrates the associations between COPD exacerbation and PE from various aspects, including epidemiology, pathophysiological changes, risk factors, clinical features, management, and prognosis. Data Sources： We searched the terms ＂chronic obstructive pulmonary disease,＂＂＇pulmonary embolism,＂＂exacerbations,＂ and ＂＇thromboembolic＂ in PubMed database and collected the results up to April 2018. The language was limited to English. Study Selection： We thoroughly examined the titles and abstracts of all studies that met our search strategy. The data from prospective studies, meta-analyses, retrospective studies, and recent reviews were selected for preparing this review. Results： The prevalence of PE in patients with COPD exacerbation varied a lot among different studies, mainly due to the variations in race, sample size, study design, research setting, and enrollment criteria. Overall, whites and African Americans showed significantly higher prevalence of PE than Asian people, and the hospitalized patients showed higher prevalence of PE compared to those who were evaluated in emergency department. PE is easily overlooked in patients with COPD exacerbation due to the similar clinical symptoms. However, several factors have been identified to contribute to the increased risk of PE during COPD exacerbation. Obesity and lower limb asymmetry were described as independent predictors for PE. Moreover, due to the high risk of PE, thromboprophylaxis has been used as an important treatment for hospitalized patients with COPD exacerbation. Conclusions： According to the previous studies, COPD patients with PE experienced an increased risk of death and prolonged l

关键词： Acute Exacerbations Chronic Obstructive Pulmonary Disease Pulmonary Embolism

Endothelial function and T-lymphocyte subsets in patients with overlap syndrome of chronic obstructive pulmonary disease and obstructive sleep apnea

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Chinese Medical Journal 2019年第14期132卷 1654-1659页

作者： Juan Wang Xin li Wan-Ju Hou li-xia dong Jie Cao Department of Respiratory Medicine Tianjin Medical University General HospitalTianjin 300052China

Background:The coexistence of chronic obstructive pulmonary disease (COPD) and obstructive sleep apnea (OSA) is termed overlap syndrome (OS).COPD and OSA both have increased risks of developing cardiovascular *** study aimed to explore if patients with OS exhibited a higher prevalence of cardiovascular complications,and if patients with OS exhibited vascular endothelial dysfunction and abnormalities in the cellular immune function of T ***:Totally 25 patients with stable COPD (COPD group),25 patients with OSA (OSA group),25 patients with OS (OS group),and 20 healthy adults (control group) were enrolled between January 2017 and December 2017 from the Respiratory Department of Tianjin Medical University General *** clinical characteristics of the four groups were collected and the expression levels of soluble vascular cell adhesion molecule-1 (sVCAM-1),tumor necrosis factor-α(TNF-α),and T-lymphocyte subsets were ***-way analysis of variance,x^2 test and Pearson correlation were used to manage the ***:The prevalence of hypertension and coronary heart disease was significantly higher in the OS group than in the control,OSA,and COPD groups (x^2 =20.69,P lial injury,stronger inflammatory respon

关键词： Chronic obstructive pulmonary disease Obstructive sleep apnea Overlap syndrome Endothelium T-lymphocyte subsets

Analysis of Health Service Utilization and its Influencing Factors among Patients with Pneumoconiosis in China

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Biomedical and Environmental Sciences 2021年第1期34卷 83-88页

作者： WANG Huan Qiang JIA Jun lin JIANG Zhao Qiang JIN Qi li dong xia liNG Rui Jie li Ying CUI Ping CHEN Gang ZHAO Hong Yu li Yan WEN Ke LYU xiang Pei LOU Jian lin li Tao National Institute of Occupational Health and Poison Control Chinese Center for Disease Control and PreventionBeijing 100050China Hangzhou Medical College(Zhejia ng Academy of Medical Sciences) Hangzhou 310013ZhejiangChina Center for Clinical Big Data and Analytics The Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310009ZhejiangChina Guizhou Hospital for Occupational Disease Prevention and Control Guiyang 550006GuizhouChina Hubei Hospital for Occupational Diseases Wuhan 430000HubeiChina Hunan Prevention and Treatment Center for Occupational Disease Changsha 410007HunanChina Shandong Academy of Occupational Health and Occupational Medicine Jinan 250062ShandongChina Beidaihe Hospital for Occupational Disease Prevent on and ControlState Administration of Production SafetyQinhuangdao 066100HebeiChina Yunnan Hospital for Occupational Diseases Kunming 650011YunnanChina Jilin Hospital for Occupational Disease Prevention and Control Changchun 132000JilinChina

Pneumoconiosis,an interstitial lung disease that occurs from breathing in certain kinds of damaging dust particles,is a major occupational disease in *** diagnosed with occupational pneumoconiosis can avail of free medical treatment,whereas patients without a diagnosis of occupational diseases cannot not claim free medical treatment in most provinces from the government before *** study aimed to analyze the priority of medical facility selection and its influencing factors among patients with pneumoconiosis.

关键词： diagnosis treatment among