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Enhanced detection of freeze‒thaw induced landslides in Zhidoi county(Tibetan Plateau,China)with Google Earth Engine and image fusion

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Advances in Climate Change Research 2024年第3期15卷 476-489页

作者： Jia-Hui YANG Yan-Chen GAO Lang JIA wen-juan wang Qing-Bai WU Francis ZVOMUYA Miles DYCK Hai-Long HE College of Natural Resources and Environment Northwest A&F UniversityYangling 712100China State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Department of Soil Science University of Manitob1Winnipeg MB R3T 2N2Canada Department of Renewable Resources University of Albert1Edmonton AB T6G 2H1Canad

Freeze‒thaw induced landslides(FTILs)in grasslands on the Tibetan Plateau are a geological disaster leading to soil *** landslides reduce biodiversity and intensify landscape fragmentation,which in turn are strengthen by the persistent climate change and increased anthropogenic ***,conventional techniques for mapping FTILs on a regional scale are impractical due to their labor-intensive,costly,and time-consuming *** study focuses on improving FTILs detection by implementing image fusion-based Google Earth Engine(GEE)and a random forest *** of multiple data sources,including texture features,index features,spectral features,slope,and vertical‒vertical polarization data,allow automatic detection of the spatial distribution characteristics of FTILs in Zhidoi county,which is located within the Qinghai‒Tibet Engineering Corridor(QTEC).We employed statistical techniques to elucidate the mechanisms influencing FTILs *** enhanced method identifies two schemes that achieve high accuracy using a smaller training sample(scheme A:94.1%;scheme D:94.5%)compared to other methods(scheme B:50.0%;scheme C:95.8%).This methodology is effective in generating accurate results using only~10%of the training sample size necessitated by other *** spatial distribution patterns of FTILs generated for 2021 are similar to those obtained using various other training sample sources,with a primary concentration observed along the central region traversed by the *** results highlight the slope as the most crucial feature in the fusion images,accounting for 93%of FTILs occurring on gentle slopes ranging from 0°to 14°.This study provides a theoretical framework and technological reference for the identification,monitoring,prevention and control of FTILs in *** developments hold the potential to benefit the management of grassland ecosystem,reduce economic losses,and promote grassland sustainability.

关键词： Permafrost degradation Random forest Thaw slump Spatial distribution Tibetan Plateau

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Statistical regularity of road network features and ecosystem change in the Longitudinal Range-Gorge Region(LRGR)

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Chinese Science Bulletin 2007年第A02期52卷 82-89页

作者： LIU ShiLiang CUI BaoShan wen MinXia wang juan DONG ShiKui State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China

作为风景的一个内在的骚乱因素，道路是明显的人工的部件。地区性的风景模式和变化被道路网络的存在和延期影响。在道路特征和它的骚乱水平之间的关系的学习为地区性的生态系统管理是重要的。在 LRGR 基于道路走廊和网络特征的空间变化... 详细信息

作为风景的一个内在的骚乱因素，道路是明显的人工的部件。地区性的风景模式和变化被道路网络的存在和延期影响。在道路特征和它的骚乱水平之间的关系的学习为地区性的生态系统管理是重要的。在 LRGR 基于道路走廊和网络特征的空间变化分析，我们用 GIS 在风景模式变化上检验了道路网络的效果。进一步，在地区性的生态的骚乱之间的整齐和网络特征被讨论。道路密度是的结果 showe 显著地，相对地形学，村庄数字和生态系统，补丁数字，和意义与道路类型极大地变化了。随道路密度和网络扩展的增加，(网络电路) ，，并且((边节点比率) ，并且(联网连接) 索引增加了。另外，总计当地区性的最小的补丁区域，平均补丁区域和传染索引减少了时，增加的生态系统补丁数字，补丁密度，风景平均和分数维的索引。低档道路有的结果展览地区性的风景破碎上的更大的效果。我们使用了 1980 和 2000 的人的骚乱索引(H d ) 显示生态的骚乱水平。H d 索引与的一种积极、重要的关系，和索引，它建议生态的骚乱与网络增加了膨胀。

关键词：统计规则性公路网纵向岭谷区生态系统

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Radical cation salts induced domino reaction of anilines with enol ethers:Synthesis of 1,2,3,4-tetrahydroquinoline derivatives

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Chinese Chemical Letters 2011年第6期22卷 671-674页

作者： Xiao Dong Jia Yan Ren Cong Dde Huo wen juan wang Xiang Ning Chen Qiong Fu Xi Cun wang Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of EducationGansu Key Laboratory of Polymer Materials College of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070China State Key Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhou 730000China

A domino reaction of anilines with cyclic and acyclic enol ethers induced by catalytic amounts of TBPA^（·＋）（5 mol%） was investigated and a series of 2,4-disubstituted-1,2,3,4-tetrahydroquinolines were *** from cyclic enol ethers, when acyclic enol ethers were used in the reaction,they serve as surrogates of acetaldehyde,producing a series of 2-methyl-4- anilino-1,2,3,4-tetrahydroquinolines.A single electron transfer mechanism was proposed to rationalize the products formation.

关键词： Domino reaction Radical cation salts 1 2 3 4-Tetrahydroquinoline Enol ether

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Effect of traditional Chinese medicine compounds on rumen fermentation, methanogenesis and microbial flora in vitro

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Animal Nutrition 2019年第2期5卷 185-190页

作者： Shui Ping wang wen juan wang Zhi Liang Tan Guo Wei Liu Cheng Fu Zhou Meng Jie Yin College of Animal Science Southwest University Key Laboratory of Agro-Ecological Processes in Subtropical Region Institute of Subtropical AgricultureChinese Academy of Sciences

This study was conducted to investigate the effects of traditional Chinese medicine compounds(TCMC)on rumen fermentation, methane emission and populations of ruminal microbes using an in vitro gas production technique. Cablin patchouli herb(CPH), Atractylodes rhizome(AR), Amur Cork-tree(AC) and Cypsum were mixed with the weight ratios of 1:1:1:0.5 and 1:1:1:1 to make up TCMC1 and TCMC2,respectively. Both TCMC were added at level of 25 g/kg of substrate dry matter. In vitro gas production was recorded and methane concentration was determined at 12 and 24 h of incubation. After 24 h, the incubation was terminated and the inoculants were measured for pH, ammonia nitrogen, volatile fatty acids(VFA). Total deoxyribonucleic acid of ruminal microbes was extracted from the inocula, and populations were determined by a real-time quantitative polymerase chain reaction. Populations of total rumen methanogens, protozoa, total fungi, Ruminococcus albus, Fibrobacter succinogenes and Ruminococcus flavefaciens were expressed as a proportion of total rumen bacterial 16 S ribosomal deoxyribonucleic acid. Compared with the control, the 2 TCMC decreased(P < 0.05) total VFA concentration,acetate molar proportion, acetate to propionate ratio, gas and methane productions at 12 and 24 h,hydrogen(H) produced and consumed, and methanogens and total fungi populations, while the 2 TCMC increased(P < 0.05) propionate molar proportion. Traditional Chinese medicine compound 1 also decreased(P ≤ 0.05) R. flavefaciens population. From the present study, it is inferred that there is an effect of the TCMC in suppressing methanogenesis, probably mediated via indirect mode by channeling H2 utilized for methanogenesis to synthesis of propionate and direct action against the rumen microbes involved in methane formation. In addition, the relative methane reduction potential(RMRP) of TCMC2 was superior to that of TCMC1.

关键词： Traditional Chinese medicine compound Fermentation characteristics Methanogenesis Ruminal microbes In vitro

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A coumarin-based colorimetric and fluorescent probe for the highly selective detection of Au^(3+) ions

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Chinese Chemical Letters 2016年第9期27卷 1563-1566页

作者： Qi wang Yan Feng Jun Jiang wen-juan wang Jiu-You Chen Hong-Ting Sheng Xiang-Ming Meng Man-Zhou Zhu School of Chemistry and Chemical Engineering & Center for Atomic Engineering of Advanced Materials Anhui University

We develop a novel coumarin-all〈yne derivative （NC7-AL）, which can specifically react with Au^3＋ and give a colorimetric and fluorescent ＂turn-on＂ response toward Au3~, Notably, other alkynophilic metal species such as Au^＋, Ag^＋, Pd^2＋, Ni^2＋, Cu^2＋, and Hg^2＋ do not produce an interfering signal. A good linear relationship between emission intensity at 420 nm and Au^3＋ concentration from 0 to 2 equivalent is observed, and the detection limit （3σ/k） is estimated to be ca. 3.58 nmol/L. Harnessing the Au^3＋ .

关键词： Coumarin Alkyne Au^3+ Colorimetric Fluorescent probe

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Local resistance characteristics of elbows for supercritical pressure RP-3 flowing in serpentine micro-tubes

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Propulsion and Power Research 2024年第2期13卷 245-256页

作者： Yanchen Fu Yinlong Liu juan wang Yu wang Guoqiang Xu Jie wen Research Institute of Aero-engine Beihang UniversityBeijing 100191China National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics Beihang UniversityBeijing 100191China Zhongfa Aviation Institute of Beihang University Hangzhou 310023China AECC Sichuan Gas Turbine Research Institute Chengdu 610500China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412002China School of Energy and Power Engineering Beihang UniversityBeijing 100191China

Based on the demands of compact heat exchangers and micro cooling channels applied for aviation thermal protection on aero-engines,the elbow localﬂow resistance charac-teristics for supercritical pressure aviation fuel RP-3ﬂowing in adiabatic horizontal serpentine tubes with the inner diameter of 1.8 mm and the massﬂux of 1179 kg/(m^(2)·s)were experimen-tally *** long-short-tube method was used to obtain the elbow pressure drop from the total serpentine tube pressure drop,and the effects of system pressures(P/Pc=1.72-2.58)and geometry parameters including bend numbers(n=5-11),bend diameters(D/d=16.7-27.8),and bend distances(L/d=20-60)on elbow pressure drops and local resistance co-efﬁcients are analyzed on the basis of the thermal physical property *** results show that both the increase in the elbow pressure drop and the decrease in the local resistance coef-ﬁcient with temperatures speed up at the near pseudo-critical temperature region of T>*** the growth of the elbow local pressure drop could be inhibited by the increase of system pressures,while the local resistance coefﬁcient is slightly affected by *** inﬂuence of bend diameters on the local resistance coefﬁcient is mild when D/d is larger than 22.2 in the premise of fully developedﬂow in straight ***,a piecewise empir-ical correlation considering the bend diameter and physical property ratio is developed to pre-dict the elbow pressure drop of the serpentine tube and optimize the layout of the cooling tube system on aero-engines.

关键词： Supercritical pressure Aviation fuel Local resistance coefﬁcient Elbow Serpentine tube Empirical correlation

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Permanent lining castable with low bulk density and thermal conductivity:bauxite castable for tundish obtained by adding pearlescent sand

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Journal of Iron and Steel Research International 2024年第3期31卷 634-646页

作者： Yi wang Jian Yang Bao wang Hai-jun Zhang juan Han Pei-yan Pei wen-long Lv Jian-an Zhou The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081HubeiChina Wuhan Research Institute of Metallurgical Construction MCCWuhan 430081HubeiChina

The low thermal conductivity and light mass of castables for tundish permanent linings are crucial for minimizing the heat loss of molten *** consideration of the low bulk density and thermal conductivity of pearlescent sand,the thermal insulation performance of castables was attempted to be improved by adding pearlescent *** sand was modified to prevent the strength of its porous structure from *** modification mechanism of pearlescent sand and the effect of pearlescent sand on the performance of bauxite castables were *** results suggested that the addition of the modified pearlescent sand significantly raised the apparent porosity and decreased the bulk density of bauxite *** 1000℃,the bulk density of more than 60%of the modified pearlescent sand-bauxite castable was only 2.03 g/cm^(3).The mechanical properties and thermal shock resistance of the modified pearlescent sand-bauxite castable were inferior to those of conventional bauxite castable but were adequate to meet the use conditions of casta-bles for tundish permanent *** high temperatures of 200-800℃,the thermal conductivity of more than 60%of the modified pearlescent sand-bauxite castable was smaller than that of conventional bauxite *** addition of the modified pearlescent sand can greatly reduce the thermal conductivity and bulk density of bauxite castable.

关键词： Pearlescent sand-Hydrophobic modification Bauxite castable Thermal insulation performance Mechanical property

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Ketogenic diet therapy in children with epilepsy caused by SLC2A1 mutations:a single-center single-arm retrospective study

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World Journal of Pediatrics 2024年第5期20卷 517-524页

作者： Ying-Yan wang Yun-Qing Zhou Li-juan Luo Cui-Jin wang Nan Shen Hao Li Ji-wen wang Department of Neurology Shanghai Children’s Medical CenterSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Department of Infectious Diseases Shanghai Children’s Medical CenterSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Clinical Research Ward Clinical Research CenterShanghai Children’s Medical CenterSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina

Background This retrospective study assessed the efficacy and safety of ketogenic diet therapies in children with epilepsy caused by SLC2A1 genetic mutations and glucose transporter type 1 deficiency *** Pediatric patients with epilepsy symptoms admitted to our medical center between January 2017 and October 2021 were included if they presented with an SLC2A1 genetic mutation on whole-exome *** analyzed the patients’convulsions and treatment with antiepileptic *** patients were followed up at different time periods after ketogenic diet *** Six patients with SLC2A1 mutations were included in this *** patients had seizures of different types and frequencies,and they took antiepileptic drugs to relieve their *** were then treated with a ketogenic diet for at least four *** analyzed epilepsy control rates at 1,2,3,6,and 12 months after ketogenic diet *** patients were seizure-free within a month of receiving the diet *** patients were followed up for six months,three were followed up for 12 months after the treatment,and there was no recurrence of epilepsy during this *** antiepileptic drug withdrawal,none of the patients experienced seizure relapse when receiving ketogenic diet treatment *** severe adverse events occurred during the *** Ketogenic diet therapy is very effective and safe for the treatment of epilepsy caused by SLC2A1 ***,patients with glucose transporter type 1 deficiency syndrome caused by SLC2A1 mutations should begin ketogenic diet treatment as soon as possible.

关键词： Epilepsy Glucose transporter type 1 Ketogenic diet SLC2A1

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Multifunctional carbon materials from rugose rose for energy storage and water purification

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Frontiers of Chemical Science and Engineering 2024年第9期18卷 1-13页

作者： Peng-Hui Li Hui Zhou wen-juan Wu Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China College of Light Industry and Food Engineering Nanjing Forestry UniversityNanjing 210037China College of Chemical Engineering East China University of Science and TechnologyShanghai 200237China State Key Laboratory of Chemical Engineering Shanghai 200237China

With the advancement of social process,the resource problem is becoming more prominent,biomass materials come into being,and it is becoming more and more important to explore and prepare efficient and multifunctional biomass materials to alleviate the problems of energy storage and water *** this paper,nitrogen-doped hierarchical porous carbon materials(NRRC)were produced by one-step carbonization of withered rose as raw material and melamine as nitrogen source with KOH-activated *** resulting nitrogen-doped porous carbon material had the most abundant pores and the best microspherical graded pore structure,with a specific surface area of up to 1393 m2·g^(-1),a pore volume of 0.68 cm3·g^(-1),and a nitrogen-doped content of 5.52%.Electrochemical tests showed that the maximum specific capacitance of NRRC in the three-electrode system was 346.4 F·g^(-1)(0.5 A·g^(-1)),which was combined with favorable capacitance retention performance and cycling *** NRRC//NRRC symmetric supercapacitors were further assembled,and the maximum energy density of a single device was 23.88 Wh·kg^(-1),which still maintains excellent capacitance retention and cyclic charging/discharging *** example,the capacitance retention rate was always close to 96.27%with almost negligible capacitance loss after 10000 consecutive charge/discharge cycles(current density:10 A·g^(-1)).Regardless of the three-electrode or two-electrode system,the super capacitive performance of NRRC porous carbon materials was comparable to the electrochemical performance of many reported biomass porous carbon materials,which showed better energy storage advantages and practical application *** addition,NRRC porous carbon materials had excellent water purification *** dye adsorption test confirmed that NRRC had a high adsorption capacity(491.47 mg·g^(-1))for methylene *** undoubtedly also showed a potential and promising avenue for high value-added utilization

关键词： rose carbon adsorption electrode material electrochemical performance

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Catalytic C-H activation-initiated transdiannulation:An oxygen transfer route to ring-fluorinated tricyclic γ-lactones

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Chinese Chemical Letters 2024年第9期35卷 145-149页

作者： Qiuyun Li Yannan Zhu Yining wang Gang Qi wen-juan Hao Kelu Yan Bo Jiang School of Chemistry and Chemical Engineering Yancheng Institute of TechnologyYancheng 224051China School of Chemistry&Materials Science Jiangsu Normal UniversityXuzhou 221116China Key Laboratory of Life-Organic Analysis of Shandong Province School of Chemistry and Chemical EngineeringQufu Normal UniversityQufu 273165China

Catalytic C–H activation-initiated annulation reactions have emerged as a versatile strategy for the efficient construction of diverse ring structural units and complex cyclic molecules in synthetic ***,we describe a new Rh(Ⅲ)-catalyzed C–H activation-initiated transdiannulation reaction of N,Ndimethyl enaminones with gem-difluorocyclopropenes in the presence of H_(2)O,enabling a facile and oxygen transfer access to ring-fluorinated tricyclicγ-lactones with a 6-5 ring-junction tetrasubstituted *** approach features bond-forming/annulation efficiency,good functional group tolerance and complete regioselectivity,which may include a complex process consisting of Rh(Ⅲ)-catalyzed C(sp2)–H activation,cyclic alkene insertion,defluorinated ring-opening of gem-difluorocyclopropane,intramolecular oxygen transfer,intramolecular cyclization and oxidative hydration.

关键词： C-H bond activation Enaminones Transannulation Oxygen transfer Regioselectivity

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