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Comparison and quantitative assessment of two regional soil erosion survey approaches

International Soil and Water Conservation Research 2023年第4期11卷 660-668页

作者： lixia dong Suhua Fu Baoyuan Liu Bing Yin Faculty of Geographical Science Beijing Normal UniversityBeijing100875PR ChinaFaculty of Geographical ScienceBeijing Normal UniversityBeijing100875PR China Advanced Institute of Natural Sciences Beijing Normal University at Zhuhai519087PR China State Key Lab Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest A&F UniversityPR China

Regional soil erosion surveys are the first step of soil conservation *** and sampling ap-proaches are commonly used for soil erosion surveys at the regional *** the grid approach,the region is divided into grids(e.g.,1 km × 1 km),and the soil erosion rate of each grid was *** the sampling approach,a small portion of the area(typically 4%or less)was taken and then the soil erosion rate was *** on the above calculation,both approaches evaluated the soil erosion area(which is the area where the soil erosion rate is greater than the soil loss tolerance(t))and its distribution in the whole *** purpose of this paper is to compare the assessment results of the two approaches and analyse their practicality using Yunyang County,Chongqing,China(area is 3636 km^(2)).The soil erosion rate,percentage of soil erosion area(PSEA,which is the ratio of the area where the soil erosion rate is greater than the soil loss tolerance(t)to the area of the total study region)and its spatial distribution were compared between the two *** results showed that the grid approach overestimated the average soil erosion rate and PSEA overall for all 33 sample units and the whole region in comparison to the sampling *** sampling approach can yield a reasonable spatial distribution of the soil erosion rate in the whole *** addition,the soil erosion regions were more clustered than those using the grid approach,which can be more suitable for soil conservation ***,the sampling approach is an efficient and practical approach in regional soil erosion *** results can provide insights into regional soil erosion surveys.

关键词： Regional soil erosion Soil erosion survey Grid approach Sampling approach CSLE

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Research on Carbon Emission for Preventive Maintenance of Wind Turbine Gearbox Based on Stochastic Differential Equation

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Energy Engineering 2024年第4期121卷 973-986页

作者： Hongsheng Su lixia dong Xiaoying Yu Kai Liu School of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou730070China

Time based maintenance(TBM)and condition based maintenance(CBM)are widely applied in many large wind farms to optimize the maintenance issues of wind turbine gearboxes,however,these maintenance strategies do not take into account environmental benefits during full life cycle such as carbon emissions ***,this article proposes a carbon emissions computing model for preventive maintenance activities of wind turbine gearboxes to solve the *** on the change of the gearbox state during operation and the influence of external random factors on the gearbox state,a stochastic differential equation model(SDE)and corresponding carbon emission model are established,wherein SDE is applied to model the evolution of the device state,whereas carbon emission is used to implement carbon emissions *** simulation results indicate that the proposed preventive maintenance cannot ensure reliable operation of wind turbine gearboxes but reduce carbon emissions during their *** with TBM,CBM minimizes unit carbon emissions without influencing reliable operation,making it an effective maintenance method.

关键词： Stochastic differential equation(SDE) condition-based maintenance(CBM) carbon emissions

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Identification of autophagy-related genes in idiopathic pulmonary fibrosis using bioinformatics methods

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Chinese Medical Journal 2022年第3期135卷 365-367页

作者： Shulei Sun lixia dong Shuo Li Jie Cao Department of Respiratory and Critical Care Medicine Tianjin Medical University General HospitalTianjin 300052China

To the Editor:Idiopathic pulmonary fibrosis(IPF)is a chronic,progressive,and fibrotic lung *** clinical processes of IPF include dyspnea,decreased lung function,and *** median survival time of patients with IPF is approximately 3 *** 5-year survival rate is less than 30%.[1]Although some progress has been made in anti-fibrotic therapy,IPF is still an incurable ***,it is necessary to explore the pathological process of IPF from the perspective of cell biology,and these explorations can provide a basis for the treatment of IPF.

关键词： lung clinical Idiopathic

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The Right Decision on the Vaginal Construction in Mayer- Rokitansky-Kiister-Hauser syndrome

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International Journal of Technology Management 2016年第3期 75-76页

作者： Xiulan Liang Huashu Ma lixia dong Xingtai People's Hospital XingtaiHeBei054000 China

Vaginal agenesis is a congenital anomaly that affects the life of one of each four thousand women around the world. There is a trend that patients request immediate surgical correction, instead of passive vaginal dilatation. Therefore a differentiated counselling should be provided. We present a comparative chart, based on published evidence, with aspect to the available techniques, which will facilitate the decision- making process in the clinical practice. From our point of view, the best results are achieved with techniques that combine the advantages of the minimal-invasive surgery with those derived of the use of peritoneum as coveting tissue of the neovagina. Nevertheless there is a lack on interdisciplinary consensus about the best option to restore the physical and sexual quality of life.

关键词： vaginal surgery miillerian ducts abnormalities Mayer-Rokitansky-Kfister-Hauser syndrome neovagina reconstructive surgical procedures methods surgery of the female genitalia.

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两种阴道成形术式的临床应用比较

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中国修复重建外科杂志 2006年第8期20卷 829-831页

作者：董丽霞邢台市人民医院妇产科河北邢台054001

目的对比两种阴道成形术的临床应用价值。方法1996年1月～2005年3月,对37例应用羊膜移植阴道成形术和26例腹腔镜下改良Vecchitti阴道成形术进行对比,比较分析其治疗先天性无阴道的优缺点,并分别对两种术式应用的阴道模型进行了相应改进... 详细信息

目的对比两种阴道成形术的临床应用价值。方法1996年1月～2005年3月,对37例应用羊膜移植阴道成形术和26例腹腔镜下改良Vecchitti阴道成形术进行对比,比较分析其治疗先天性无阴道的优缺点,并分别对两种术式应用的阴道模型进行了相应改进。结果羊膜移植阴道成形术组37例均取得成功,术后随访35例,随访时间2个月～4年;发生羊膜感染3例,瘢痕挛缩2例,其中1例于术后13个月行瘢痕切开术获成功,另1例拒绝再次手术。腹腔镜下改良Vecchitti阴道成形术组手术26例均取得成功,术后均获随访,随访时间2个月～2.5年,无阴道感染及瘢痕挛缩。两种术式成形的阴道宽敞,黏膜呈粉红色,有皱壁、润滑、弹性好,外阴外观无改变,性生活满意。两种术式中的改进之处均取得了良好的临床应用效果。结论腹腔镜下改良Vecchitti阴道成形术与羊膜移植阴道成形术比较具有明显优势,有推广价值。

关键词：羊膜腹腔镜阴道成形术比较研究

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Effects of Carbon Ion on M1 Seedlings of Sugar Sorghum under Drought Stress

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2009年第1期 128-129页

作者： He Jinyu Li Wenjian Yu lixia dong Xicun

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The radiographic bronchiectasis in patients with COPD-OSA overlap syndrome

The radiographic bronchiectasis in patients with COPD-OSA ov...

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中国睡眠研究会第十一届全国学术年会

作者： Xia Yang lixia dong Jie Cao Tianjin Medical University General Hospital

Background and purpose COPD-OSA（chronic obstructive pulmonary disease-obstructive sleep apnea） overlap syndrome have higher mortality and more frequent exacerbation compared with either disease alone. Bronchiectasis revealed by high-resolution computed tomography（HRCT） is common in COPD and associated with the exacerbation. Sleep disorders and hypoxia are associated with bronchiectasis, but whether OSA is associated with comorbid bronchiectasis in COPD（COPD-Bx） is unknown. Patients and methods Patients with stable COPD were enrolled consecutively and evaluated for the presence of OSA by nocturnal polysomnography（PSG）. The presence and severity of bronchiectasis on lung HRCT were evaluated by the Smith and severity scores. COPD symptoms were evaluated by COPD Assessment Test（CAT） and Modified British Medical Research Council Questionnaire（mMRC）. The blood routine, the concentrations of high sensitive c-reactive protein（hs-CRP）, serum total Immunoglobulin E（IgE） and the proportion of the blood lymphocyte subtypes were measured. Results We enrolled 124 patients with stable COPD, of which 70（56.5%） were diagnosed to have OSA according to the data of PSG screening. The prevalence of bronchiectasis was 42.9% in patients with OSA, but 18.5% in those without OSA（P=0.025）. The severity score and the Smith score which is the radiographic extent of bronchiectasis, were both comparable between COPD-Bx patients with and without OSA. COPD patients with OSA had higher scores of CAT, mMRC, AHI and longer time spent with SpO2＜90% as compared to those without OSA. In COPD-Bx patients with OSA, there were more higher levels of CRP and lower CD4/CD8 as compared to those without OSA. In all the COPD patients, the severity score of bronchiectasis was correlated with the levels of CD8（r=0.694, P＜0.01） and CD4/CD8（r=-0.544, P＜0.01）. And the Smith score was also correlated with the levels of CD8（r=0.710, P＜0.01） and CD4/CD8（r=-0.558, P＜0.01）. Conclusions COPD-OSA overlap syndrome patient ha

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中国家庭财富不平等状况、形成机制及对策

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当代经济研究 2023年第4期 115-128页

作者：董丽霞中国社会科学院经济研究所北京100836

在共同富裕视域下,研究中国家庭财富分配演变及其形成机制,对扎实推进共同富裕具有重要意义。研究结果发现:我国居民家庭财富不平等程度较高且呈上升趋势,财富有向高财富组集中的倾向;户主的年龄、教育程度、收入水平和户籍,配偶的教育... 详细信息

在共同富裕视域下,研究中国家庭财富分配演变及其形成机制,对扎实推进共同富裕具有重要意义。研究结果发现:我国居民家庭财富不平等程度较高且呈上升趋势,财富有向高财富组集中的倾向;户主的年龄、教育程度、收入水平和户籍,配偶的教育水平、收入,以及家庭住房数量都会对家庭财富产生显著影响,这些因素会导致家庭财富积累差异化,进而造成财富不平等;高财富组老年人的比例越来越高,且城镇家庭财富占比远高于农村家庭;最高10%财富组和中间40%财富组占有大部分住房资产和金融资产,且负债结构以房产负债为主;最低50%财富组只占有少数住房和金融资产,且负债结构以消费负债为主。上述结论意味着未来房价升高和金融资产价格上涨可能会进一步拉大财富差距。

关键词：共同富裕财富分配财富集中度资产结构负债结构

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数字普惠金融与中国农村家庭财富差距

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技术经济 2022年第12期41卷 111-122页

作者：董丽霞中国社会科学院经济研究所北京100836

促进农民增收致富和推动乡村振兴是二十大关注的重要问题。本文用分位回归方法分析了数字普惠金融对中国农村家庭财富差距的影响。结果发现:数字普惠金融可以显著提高农村家庭财富积累,并有利于缩小农村家庭财富差距。异质性分析表明,... 详细信息

促进农民增收致富和推动乡村振兴是二十大关注的重要问题。本文用分位回归方法分析了数字普惠金融对中国农村家庭财富差距的影响。结果发现:数字普惠金融可以显著提高农村家庭财富积累,并有利于缩小农村家庭财富差距。异质性分析表明,数字普惠金融发展对于低收入家庭和低教育水平家庭财富的正向作用更强,进一步证明了上述结论。机制分析表明,数字普惠金融能显著促进农村家庭特别是低财富家庭的创业行为,而创业对于最低财富组家庭资产的正向刺激作用最强;受流动性约束可能性越大的低财富家庭,越能从数字普惠金融的发展中获益。本文的研究说明,发展数字普惠金融对于探索农民致富路径和推进乡村振兴有积极作用。

关键词：数字普惠金融农村家庭财富差距创业分位回归

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甲醇制烯烃/甲醇制丙烯副产C_(5)~C_(9)^(+)馏分加氢催化剂及工艺研究

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石油化工 2023年第11期52卷 1519-1524页

作者：董立霞杜周中国石化北京化工研究院燕山分院北京102500

对甲醇制烯烃(MTO)/甲醇制丙烯(MTP)副产C_(5)~C_(9)^(+)馏分进行详细的组分和杂质分析。实验结果表明,MTO馏分主要为C_(5)~C_(7),烃类主要为单烯烃;MTP馏分主要为苯、正己烷和己二烯;MTO/MTP副产C_(5)~C_(9)^(+)馏分中含有较多的含氧... 详细信息

对甲醇制烯烃(MTO)/甲醇制丙烯(MTP)副产C_(5)~C_(9)^(+)馏分进行详细的组分和杂质分析。实验结果表明,MTO馏分主要为C_(5)~C_(7),烃类主要为单烯烃;MTP馏分主要为苯、正己烷和己二烯;MTO/MTP副产C_(5)~C_(9)^(+)馏分中含有较多的含氧化合物与含氯化合物,远超常规加氢催化剂的耐受范围;以Ti改性的复合氧化物载体制备催化剂BY-6M并用于MTO/MTP副产C_(5)~C_(9)^(+)馏分加氢,常规加氢评价条件下均可实现产品中无二烯烃检出、单烯烃含量变化不大,且稳定运行1000 h,达到工业化应用标准。

关键词：加氢催化剂 C_(5)~C_(9)^(+)馏分甲醇制烯烃甲醇制丙烯芳烃

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