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Raindrop Size Distribution Measurements at High Altitudes in the Northeastern Tibetan Plateau during Summer

Advances in Atmospheric Sciences 2023年第7期40卷 1244-1256页

作者： Huibang HAN Yuxin ZHANG Jianbing TIAN Xiaoyan KANG Meteorological Disaster Prevention technology Center in qinghai province Xining 810000China key laboratory for Disaster Prevention and Mitigation in qinghai province Xining 810000China

Characteristics of raindrop size distribution during summer are studied by using the data from six Parsivel disdrometers located in the northeastern Tibetan *** analysis focuses on convective and stratiform precipitation at high altitudes from 2434 m to 4202 *** results show that the contribution of stratiform and convective precipitation with rain rate between 1≤R<5 mm h^(-1) to the total precipitation increases with altitude,and the raindrop scale and number concentration of convective precipitation is larger than that for stratiform *** droplet size spectra of both stratiform and convective precipitation shows a single peak with a peak particle size between 0.31–0.50 mm,and they have essentially the same peak particle size and number concentration at the same *** maximum spectral widths of stratiform clouds are between 4 mm and 5 mm,while those of convective clouds range from 4 mm to 8 *** Gamma distribution is more suitable than the Marshall-Palmer distribution in terms of the actual raindrop spectrum *** stratiform precipitation particles are smaller with higher number concentration,while the opposite is true for the convective precipitation *** convective precipitation particles drop faster than stratiform precipitation particles when the particle size exceeds 2 mm,and the falling velocity of raindrops after standard curve fitting is underestimated during the observation ***,conventional radar estimation methods would underestimate the precipitation in the Northeastern Tibetan Plateau.

关键词： raindrop size distribution precipitation microphysics Northeastern Tibetan Plateau fall velocity

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An improved particle filter indoor fusion positioning approach based on Wi-Fi/PDR/geomagnetic field

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Defence technology（防务技术） 2024年第2期32卷 443-458页

作者： Tianfa Wang Litao Han Qiaoli Kong Zeyu Li Changsong Li Jingwei Han Qi Bai Yanfei Chen College of Geodesy and geomatics Shandong University of Science and TechnologyQingdao266590China key laboratory of geomatics and Digital technology of Shandong province Shandong University of Science and TechnologyQingdao266590China

The existing indoor fusion positioning methods based on Pedestrian Dead Reckoning(PDR)and geomagnetic technology have the problems of large initial position error,low sensor accuracy,and geomagnetic *** this study,a novel indoor fusion positioning approach based on the improved particle filter algorithm by geomagnetic iterative matching is proposed,where Wi-Fi,PDR,and geomagnetic signals are integrated to improve indoor positioning *** important contribution is that geomagnetic iterative matching is firstly proposed based on the particle filter *** the positioning process,an iterative window and a constraint window are introduced to limit the particle generation range and the geomagnetic matching range *** position is corrected several times based on geomagnetic iterative matching in the location correction stage when the pedestrian movement is detected,which made up for the shortage of only one time of geomagnetic correction in the existing particle filter *** addition,this study also proposes a real-time step detection algorithm based on multi-threshold constraints to judge whether pedestrians are moving,which satisfies the real-time requirement of our fusion positioning *** experimental verification,the average positioning accuracy of the proposed approach reaches 1.59 m,which improves 33.2%compared with the existing particle filter fusion positioning algorithms.

关键词： Fusion positioning Particle filter Geomagnetic iterative matching Iterative window Constraint window

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Effect and mechanism of reactive oxygen species-mediated NOD-like receptor family pyrin domain-containing 3 inflammasome activation in hepatic alveolar echinococcosis

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World Journal of Gastroenterology 2023年第14期29卷 2153-2171页

作者： Cai-Song Chen Yao-Gang Zhang Hai-Jiu Wang Hai-Ning Fan Research Center for High Altitude Medicine of qinghai University Affiliated Hospital of Qinghai UniversityXining 810001Qinghai ProvinceChina qinghai province Research key laboratory for Echinococcosis Affiliated Hospital of Qinghai UniversityXining 810001Qinghai ProvinceChina Department of Hepatobiliary and Pancreatic Surgery Qinghai Province Research Key Laboratory for EchinococcosisAffiliated Hospital of Qinghai UniversityXining 810001Qinghai ProvinceChina

BACKGROUND The NOD-like receptor family pyrin domain-containing 3(NLRP3)inflammasome is a significant component of the innate immune system that plays a vital role in the development of various parasitic ***,its role in hepatic alveolar echinococcosis(HAE)remains *** To investigate the NLRP3 inflammasome and its mechanism of activation in *** We assessed the expression of NLRP3,caspase-1,interleukin(IL)-1β,and IL-18 in the marginal zone and corresponding normal liver of 60 patients with HAE.A rat model of HAE was employed to investigate the role of the NLRP3 inflammasome in the marginal zone of *** experiments were conducted to investigate the effect of Echinococcus multilocularis(***)in stimulating Kupffer cells and ***,immunohistochemistry,Western blotting,and enzyme-linked immunosorbent assay were used to evaluate NLRP3,caspase-1,IL-1β,and IL-18 expression;flow cytometry was used to detect apoptosis and reactive oxygen species(ROS).RESULTS NLRP3 inflammasome activation was significantly associated with *** of ROS production decreased NLRP3-caspase-1-IL-1βpathway activation and mitigated hepatocyte damage and *** *** induces hepatocyte damage and inflammation by activating the ROS-mediated NLRP3-caspase-1-IL-1βpathway in Kupffer cells,indicating that ROS may serve as a potential target for the treatment of HAE.

关键词： Hepatic alveolar echinococcosis Inflammasome Inflammation Kupffer cell NLR family pyrin domain-containing 3 protein Reactive oxygen species

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Long-term Properties of Aeolian Sand-magnesium Oxychloride Cement Composites and Its Engineering application

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Journal of Wuhan University of technology(Materials Science) 2023年第4期38卷 842-848页

作者：常成功 DONG Jinmei ZHENG Weixin WEN Jing 阎峰云肖学英 AN Lingyun State key laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou730050China key laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakeChinese Academy of SciencesXining810008China key laboratory of Salt Lake Resources Chemistry of qinghai province Xining810008China qinghai Provincial key laboratory of Nanomaterials and technology College of Physics and Electronic Information EngineeringQinghai Minzu UniversityXining810007China

In order to prepare a new material with long-term stable performance,low cost,easy construction,and ecological environmental protection,the influence of aeolian sand on the compressive and flexural strength as well as micro morphology and phase composition of magnesium oxychloride cement(MOC)was *** experimental results indicate that,with the increase of content of doping sand,the compressive strength and flexural strength of MOC decrease ***,when the quality ratio of aeolian sand and light burned magnesia powder is 1:8,the performance meets the actual engineering ***,the compressive strength of MOC is not less than 18 MPa,and flexural strength is not less than 4 ***,within 12 months of age,the compressive strength and flexural strength are *** is no obvious change in phase composition,and its main phase is still 5·1·8 *** appearance changes from needle-like to gel-like *** on engineering applications,it is found that when the novel sand-fixing material is used in the field for one year,its macroscopic feature is not damaged,compressive strength and flexural strength are also more stable,phase composition negligibly changes,and micro morphology has also been turned into be gellike *** further confirm the long-term stability and weather resistance of MOC doping aeolian sand,providing theoretical and technical support for the widely application of MOC in the field of sand fixation in the future.

关键词： magnesium oxychloride cement aeolian sand mechanical properties micro morphology phase composition

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Mapping landslide susceptibility at the Three Gorges Reservoir, China, using gradient boosting decision tree,random forest and information value models

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Journal of Mountain Science 2020年第3期17卷 670-685页

作者： CHEN Tao ZHU Li NIU Rui-qing TRINDER C John PENG Ling LEI Tao Institute of Geophysics and geomatics China University of GeosciencesWuhan 430074China geomatics technology and application key laboratory of qinghai province Xining 810001China School of Civil and Environmental Engineering The University of New South WalesSydneyNSW 2052Australia China Institute of Geo-Environment Monitoring Beijing 100081China School of Electronical and Information Engineering Shaanxi University of Science and TechnologyXi’an 710021China

This work was to generate landslide susceptibility maps for the Three Gorges Reservoir(TGR) area, China by using different machine learning models. Three advanced machine learning methods, namely, gradient boosting decision tree(GBDT), random forest(RF) and information value(InV) models, were used, and the performances were assessed and compared. In total, 202 landslides were mapped by using a series of field surveys, aerial photographs, and reviews of historical and bibliographical data. Nine causative factors were then considered in landslide susceptibility map generation by using the GBDT, RF and InV models. All of the maps of the causative factors were resampled to a resolution of 28.5 m. Of the 486289 pixels in the area,28526 pixels were landslide pixels, and 457763 pixels were non-landslide pixels. Finally, landslide susceptibility maps were generated by using the three machine learning models, and their performances were assessed through receiver operating characteristic(ROC) curves, the sensitivity, specificity,overall accuracy(OA), and kappa coefficient(KAPPA). The results showed that the GBDT, RF and In V models in overall produced reasonable accurate landslide susceptibility maps. Among these three methods, the GBDT method outperforms the other two machine learning methods, which can provide strong technical support for producing landslide susceptibility maps in TGR.

关键词： Mapping landslide susceptibility Gradient boosting decision tree Random forest Information value model Three Gorges Reservoir

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Research on Tibetan Speech Recognition Based on the Am-do Dialect

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Computers, Materials & Continua 2022年第12期73卷 4897-4907页

作者： Kuntharrgyal Khysru Jianguo Wei Jianwu Dang key laboratory of Artificial Intelligence application technology State Ethnic Affairs Commission Qinghai Minzu UniversityXining810007China Tianjin key laboratory of Cognitive Computing and application Tianjin UniversityTianjin300072China Japan Advanced Institute of Science and technology IshikawaJapan

In China,Tibetan is usually divided into three major dialects:the Am-do,Khams and Lhasa *** Am-do dialect evolved from ancient Tibetan and is a local variant of modern *** this dialect has its own specific historical and social conditions and development,there have been different degrees of communication with other ethnic groups,but all the abovementioned dialects developed from the same language:*** paper uses the particularity of Tibetan suffixes in pronunciation and proposes a lexicon for the Am-do language,which optimizes the problems existing in previous *** data of the Am-do dialect are expanded by data augmentation technology combining noise and reverberation,and the morphological characteristics and characteristics of the Tibetan language are further *** to the particularity of Tibetan grammar,grammatical features are used to optimize grammatical relationships and are combined with a language model,and the Am-do dialect is scored and *** results show that compared with the baseline,our proposed new lexicon and data augmentation technology yields a relative increase of approximately 3%in character error rates(CERs)and a relative increase of 3%-19%in the recognition rate of acoustic models and language models.

关键词： Am-do dialect acoustic model language model rescoring

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Correction of global digital elevation models in forested areas using an artificial neural network-based method with the consideration of spatial autocorrelation

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International Journal of Digital Earth 2023年第1期16卷 1568-1588页

作者： Yanyan Li Linye Li Chuanfa Chen Yan Liu College of Geodesy and geomatics Shandong University of Science and TechnologyQingdaoPeople’s Republic of China key laboratory of geomatics and Digital technology of Shandong province Shandong University of Science and TechnologyQingdaoPeople’s Republic of China

To remove vegetation bias(VB)from the global DEMs(GDEMs),an artificial neural network(ANN)-based method with the consideration of elevation spatial autocorrelation is developed in this *** study sites with different forest types(evergreen,mixed evergreen-deciduous,and deciduous)are employed to evaluate the performance of the proposed model on three popular 30-m GDEMs,including SRTM1,AW3D30,and *** LiDAR DTM as the ground truth,the accuracy of the GDEMs before and after VB correction is assessed,as well as two existing GDEMs including MERIT and *** show that all the original GDEMs significantly overestimate the LiDAR DTM in the three forest types,with the largest biases of 21.5 m for SRTM1,26.3 m for AW3D30,and 27.18 m for *** data randomly sampled from the corrected area as the training points,the proposed model reduces the mean errors(root mean square errors)of the three GDEMs by 98.8%-99.9%(55.1%-75.8%)in the three *** training data have the same forest type as the corrected GDEM but under different local situations,the proposed model lowers the GDEM errors by at least 76.9%(44.1%).Furthermore,our corrected GDEMs consistently outperform the existing GDEMs for the two cases.

关键词： Vegetation bias terrain parameter elevation correction machine learning

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Isolation of Mucor circinelloides Z4 and Mucor racemosus Z8 from heavy metal-contaminated soil and their potential in promoting phytoextraction with Guizhou oilseed rap

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Journal of Central South University 2015年第1期22卷 88-94页

作者：朱生翠汤建新曾晓希魏本杰杨少迪黄斌 Hunan key laboratory of Green Packaging and Biological Nanotechnology Hunan University of Technology Meteorological Institute of qinghai province School of Metallurgy and Environment Central South University

Fungi Z4 and Z8, isolated from the heavy metal polluted soil, have strong resistance to Cd and Pb. The strains were identified on the base of their morphology and internal transcribed spacers(ITS) region. Pot experiments were conducted to study the effect of two strains(Z4 and Z8) on the growth and accumulation of Cd and Pb of Guizhou oilseed rape. The results show that strains Z4 and Z8 belong to Mucor circinelloides and Mucor racemosus, respectively. The heights of Guizhou oilseed rape inoculated with strain Z8 increase by 47.90% than the control. The highest fresh mass is found in the plant with Z4/Z8, which is enhanced by160.81%. Pot experiments show that Z4/Z8 inoculums can accelerate accumulation of heavy metals in the plant. The contents of Cd and Pb are increased by 117.60% and 63.48%, respectively. Meanwhile, the heavy metal concentrations in potting soil with the two strains are found to be lower than those of the control, and the concentrations of Cd and Pb are decreased by 60.57% and 27.12%,respectively.

关键词： phytoextraction fungus cadmium lead oilseed rape

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Effects of degradation succession of alpine wetland on soil organic carbon and total nitrogen in the Yellow River source zone,west China

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Journal of Mountain Science 2021年第3期18卷 694-705页

作者： LIN Chun-ying LI Xi-lai ZHANG Jing SUN Hua-fang ZHANG Juan HAN Hui-bang WANG Qi-hua MA Cheng-biao LI Cheng-yi ZHANG Yu-xing MA Xue-qian State key laboratory of Plateau Ecology and Agriculture Qinghai UniversityXining 810016China qinghai province Weather Modification Office Xining 810001China College of Agriculture and Animal Husbandry Qinghai UniversityXining 810016China Meteorological Institute of qinghai province Xining 810001China qinghai province geographic situation monitoring Institute Xining 810001China

Wetland is an important carbon pool,and the degradation of wetlands causes the loss of organic carbon and total *** study aims to explore how wetland degradation succession affects soil organic carbon(SOC)and total nitrogen(TN)contents in alpine wetland.A field survey of 180 soilsampling profiles was conducted in an alpine wetland that has been classified into three degradation succession *** SOC and TN contents of soil layers from 0 to 200 cm depth were studied,including their distribution characteristics and the relationship between *** results showed that SOC and TN of different degradation succession gradients followed the ranked order of Non Degradation(ND)>Light Degradation(LD)>Heavy Degradation(HD).SWC was positively correlated with SOC and TN(p<0.05).As the degree of degradation succession worsened,SOC and TN became more sensitive to the *** was closely related to the degree of wetland degradation succession,SWC,SOC and TN,especially in the topsoil(0-30 cm).This result showed that SWC was an important indicator of SOC/TN in alpine *** is highly recommended to strengthen water injection into the wetland as a means of effective restoration to reverse alpine meadow back to marsh alpine wetland.

关键词： Degradation succession Soil organic carbon(SOC) Total nitrogen(TN) Soil water content(SWC) Microtopography Soil depth

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Identification and virulence test of a new pathogen that causes verticillium striping on rapeseed in northwestern China

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Oil Crop Science 2024年第1期9卷 8-19页

作者： We Si Ruisheng Wang Mingde Wu Long Yang Guoqing Li Jing Zhang State key laboratory of Agricultural Microbiology and key laboratory of Plant Pathology of Hubei province Huazhong Agricultural UniversityWuhan 430070China qinghai Academy of Agriculture and Forestry Sciences Qinghai UniversityXiningQinghai Province810016China

Five stems of rapeseed with abundant black microsclerotia were collected from Huangyuan County of qinghai province,China,and fungal isolates were obtained from the *** were identified based on morphology,molecular features and specific PCR *** results showed that the 10 fungal isolates belonged to Verticillium longisporum lineage A1/*** of the 10 isolates(HW7-1)was tested for virulence on three species of rapeseed,including *** Zhongshuang 9,*** Qingyou 9 and *** Tayou 2 by conidia inoculation of HW7-1 on roots of young *** seedlings were inoculated with *** conidia or water *** seedlings of these treatments were transplanted in culture mix and incubated in a growth chamber(20℃).Results suggested that the control seedlings of three cultivars appeared quite healthy,while the seedlings inoculated with HW7-1 turned yellowing leaves,seedling stunting or even death after 22 days *** was re-isolated from he yellow leaves,thus fulfilling Koch's ***,compared to the control treatments,inoculation with HW7-1 caused flowering delay and seed yield reduction on Tayou 2 with production of microsclerotia on the *** our knowledge,this is the first report of *** lineage A1/D3 on rapeseed in northwestern China.

关键词： Verticillium longisporum lineage A1/D3 Virulence Rapeseed China

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