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Simulation of the landform change process on a purple soil slope due to tillage erosion and water erosion using UAV technology

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Journal of Mountain Science 2020年第6期17卷 1333-1344页

作者： YANG Chao SU Zheng-an fan jian-rong fanG Hai-dong SHI Liang-tao ZHANG jian-hui HE Zhou-yao ZHOU Tao WANG Xiao-yi Key Laboratory of Mountain Hazards and Earth Surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China Research Center for Digital Mountain and Remote Sensing Application Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Science Beijing 100049China Institute of Tropical Eco-agriculture Sciences Yunnan Academy of Agricultural SciencesYuanmou 651300China Forestry College Sichuan Agricultural UniversityChengdu 611130China

Both tillage erosion and water erosion are severe erosional forms that occur widely on sloping agricultural ***,previous studies have rarely considered the process of landform change due to continuous simulation experiments of alternating tillage erosion and water *** identify such changes,we applied a scouring experiment(at a 60 L min-1 water discharge rate based on precipitation data from the local meteorological station and the catchment area in the Yuanmou County,Yunnan Province,China)and a series of simulated tillage experiments where plots were consecutively tilled 5,10,and 15 times in rotation(representing 5 yr,10 yr,and 15 yr of tillage)at slope gradients of 5°,10°,and 20°.Close-range photogrammetry(CRP)employing an unmanned aerial vehicle(UAV)and a real-time kinematic global positioning system(RTK-GPS)was used to measure landform changes,and highresolution digital elevation models(DEMs)were generated to calculate net soil loss ***,the CRP was determined to be accurate and applicable through the use of erosion *** average tillage erosion rates were 69.85,131.45,and 155.34 t·hm-2·tillage pass-1,and the average water erosion rates were 1892.52,2961.76,and 4405.93 t·hm-2·h-1 for the 5°,10°,and 20°sloping farmland plots,*** water erosion rates increased as tillage intensity increased,indicating that tillage erosion accelerates water *** these intensive tillage treatments,slope gradients gradually decreased,while the trend in slope gradients increased in runoff plots at the conclusion of the scouring *** to the original plots(prior to our experiments),interactions between tillage and water erosion caused no obvious change in the landform structure of the runoff plots,while the height of all the runoff plots *** findings showed that both tillage erosion and water erosion caused a pseudo-steady-state landform evolutionary mechanism and resulted in thin soil layers on cultivat

关键词： Landform change Tillage erosion Water erosion Close range photogrammetry Erosion pins Runoff plot

Molecular Dipole Moment Computed with Ab Initio MKS Charges

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Chinese Journal of Structural Chemistry 2002年第2期21卷 139-141页

作者： fan jian-Fen WANG Qu-Xia XIA Qi-Ying XIAO He-Ming B.van de Graaf Department of Chemistry Suzhou UniversitySuzhou 215006China Department of Chemistry University of Science and TechnologyNanjing 210094China Faculty of Chemical Engineering and Material Science Delft University of TechnologyJulianalaan 1362628 DelfThe Netherlands

Molecular dipole moments computed at the levels of HF/STO-3G, HF/6-31G(d, p), HF/6-311+G(2d, 2p), MP2/6-31G(d, p) and MP2/6-311+G(2d, 2p) have been investigated. HF/6-311+G(2d, 2p) was found to be the relatively good choice to compute MKS charges for reproducing the experimental values of molecular dipole moments. Root mean square deviation of computed dipole moments for 21 small polar molecules is about 0.1969 D.

关键词： molecular dipole moment MKS charge HF/6-311+G(2d 2p)

石灰与谷壳炭配施对酸性红壤肥力特征和花生产量的影响

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土壤通报 2024年第4期55卷 1007-1013页

作者：樊剑波艾栋柳开楼何小林梁丰吴艳黄晶黄尚书韩天富中国科学院红壤生态实验站江西鹰潭335200 中国农业科学院农业资源与农业区划研究所北京100081 江西省红壤及种质资源研究所江西南昌331717 江西省农业技术推广中心南昌330046 江西农业大学国土资源与环境学院/江西省鄱阳湖流域农业资源与生态重点实验室南昌330045

【目的】探明石灰与谷壳炭配施对红壤酸化特性和花生产量的影响,为实现红壤pH和花生产量同步提升提供理论依据。【方法】通过大田花生试验,以常规化肥处理为对照(CK),再设置4个处理:L1C1(石灰,750 kg hm^(-2);谷壳炭,2250 kg hm^(-2))、... 详细信息

【目的】探明石灰与谷壳炭配施对红壤酸化特性和花生产量的影响,为实现红壤pH和花生产量同步提升提供理论依据。【方法】通过大田花生试验,以常规化肥处理为对照(CK),再设置4个处理:L1C1(石灰,750 kg hm^(-2);谷壳炭,2250 kg hm^(-2))、L1C2(石灰,750 kg hm^(-2);谷壳炭,4500 kg hm^(-2))、L2C1(石灰,1500 kg hm^(-2);谷壳炭,2250 kg hm^(-2))、L2C2(石灰,1500 kg hm^(-2);谷壳炭,4500 kg hm^(-2))。测定播种后15 d和花生收获后的土壤pH、有机质和速效氮磷钾养分含量,比较分析不同处理的产量特征,并探讨石灰与谷壳炭配施下酸性红壤肥力和花生产量的相关关系。【结果】播种后15 d,与CK相比,L1C1、L1C2、L2C1和L2C2处理土壤pH、有机质、碱解氮、有效磷和速效钾含量分别提高了0.15~0.32个单位、11.92%~22.95%、42.07%~61.74%、17.05%~43.99%和13.72%~31.68%。花生收获后,L1C1、L1C2、L2C1和L2C2处理的土壤pH、有机质、碱解氮、有效磷和速效钾含量也大体呈现出显著高于CK的趋势。同时,等量谷壳炭条件下,L2C1、L2C2处理较L1C1和L1C2处理显著提高了播种后15 d土壤pH和花生收获后的土壤碱解氮含量。与CK相比,L1C1、L1C2、L2C1和L2C2处理花生产量分别提高了8.30%、9.76%、11.12%和13.31%。播种后15 d和花生收获后土壤pH、碱解氮与花生产量均呈显著正相关关系。线性回归分析结果表明,当播种后15天土壤pH提升0.1个单位,花生产量可增加80.25 kg hm^(-2),明显高于花生收获的增量(64.12 kg hm^(-2))。而当播种后15天和花生收获后的土壤碱解氮提升1.00 mg kg^(-1),花生产量可达到的增量差异较小(分别为11.07和9.72 kg hm^(-2))。【结论】与常规化肥处理相比,常规施用化肥配施石灰、谷壳炭可以显著提升酸化红壤pH,增加土壤有效态氮磷钾养分含量和提升花生产量。为此,建议在红壤旱地上重点调控土壤pH和碱解氮含量,以期实现花生高产。

关键词：红壤酸化花生石灰谷壳炭相关关系

Surface Ferrite Grain Refinement and Mechanical Properties of Low Carbon Steel Plates

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Journal of Iron and Steel Research International 2006年第4期13卷 35-39页

作者： fan jian-wen DAI Xiao-li XIE Rui-ping ZHANG Wei-xu WANG Zu-bin Shougang Research Institute of Technology Shougang Group Corporation Beijing 100041 China Chinese Society for Metals Beijing 100011 China

Considering the specialities of the steel plate production, the TMCP study has been carried out with Gleeble 2000 tester to explore the possibility of fine grained ferrite in the low carbon steel plates with the chemical composition of C 0.13--0.18, Si 0.12-0.18, Mn 0.50-0. 65, P 0. 010-0. 025, and S 0. 005-0. 028. The plates with thickness of 8. 7 mm in which the ferrite grain size is smaller than 8μm have been produced by special de- formation process in the laboratory. Furthermore, the trial production of special plain carbon steel plates of 16-25 mm in thickness and 2 000- 2 800 mm in width with fine grained ferrite has been successfully carried out in the Shougang Steel Plate Rolling Plant. The ferrite grain size is 5.5-7μm in the surface layers and 9.5-15μm in the central layer respectively. The yield strength is 320- 360 MPa, tensile strength is 440-520 MPa and the elongation is 25%- 34 %. It is very important for the rolling plants to improve the low carbon steel plates＇ mechanical properties. The results show that the ferrite grains in the surface layer can be refined effectively by the appropriate rolling process, and the strength can be also increased.

关键词： TMCP fine grained ferrite plain low carbon steel plate mechanical property

Lipid metabolism-related long noncoding RNAs:A potential prognostic biomarker for hepatocellular carcinoma

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World Journal of Gastroenterology 2024年第33期30卷 3799-3802页

作者： Rui-Nan Zhang jian-Gao fan Department of Gastroenterology Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China

The incidence rates of hepatocellular carcinoma(HCC)have increased in recent *** advancements in therapy and early diagnosis improving shortterm prognosis,long-term outcomes remain *** noncoding RNAs(lncRNAs)and lipid metabolism play crucial roles in the development and progression of *** lipid synthesis promotes HCC progression,and lncRNAs can reprogram the expression of lipogenic ***,lipid metabolism-related(LMR)-lncRNAs regulate lipid anabolism,accelerating the onset and progression of *** suggests that LMR-lncRNAs could serve as novel prognostic biomarkers and therapeutic targets.

关键词： Long noncoding RNAs Lipid metabolism Hepatocellular carcinoma Prognosis Biomarker

Effects of Glutamine Supplementation on Patients Undergoing Abdominal Surgery

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Chinese Medical Sciences Journal 2009年第1期24卷 55-59页

作者： Yue-Dina fan jian-chun Yu Wei-ming Kang Qun Zhang Department of Surgery Peking Union Medical College HospitalChinese Academy of Medical Sciences ＆ Peking Union Medical College Beijing 100730 China

Objective To evaluate the effects of supplementation of glutamine （GLN） on maintaining glu- tathione （GSH） level, immune system function, liver function, and clinical outcome of patients receiving abdominal operation. Methods Forty patients undergoing elective abdominal surgical treatment were randomly divided into 2 groups： study group （n=20） and control group （n=20）. All patients received total parenteral nutrition （TPN） for up to 7 days during perioperative period. The study group received TPN supplemented with GLN dipeptide while the control group received TPN without GLN dipeptide. Patients in both groups received equivalent nitrogen and caloric intake. Blood sample was taken on preoperative day, and the 1st, 3rd, 6th postoperative day to measure GSH level, immune indexes, and liver function indexes. Results The decrease of GSH level in plasma and red blood cell （RBC） in study group was less than that in control group during postoperative period. Ratio of GSH/glutathione disulfide （GSSG） in plasma in study grouP was higher than that in control group on the 3rd postoperative day （52.53±11.46 vs. 31.43±7.27, P = 0.001）. Albumin level in study group was higher than that in control group on the 3rd postoperative day （37.7±3.8 g/L vs. 33.8±4.2 g/L, P = 0.02）. There was no significant difference in the levels of immunoglobin （IgG, IgM, IgA） or T lymphocyte subgroup （CD4, CD8, CD4/CD8） in both groups during postoperative period. There was one case with infectious complication in control group, while none in study group. A trend of shortened hospital stay was observed in study group compared with control group （22.3±2.1 d vs. 24.9±1.7 d,P= 0.32）. Conclusions Supplementation of GLN-enriched TPN has beneficial effects on maintaining GSH levels in plasma and RBC, sustaining GSH/GSSG ratio and albumin level, and keeping antioxidant abilities during postoperative period in patients with abdominal operation, with the trends of decreasing incidence of infectious complicati

关键词： glutamine dipepfide glutathione total parenteral nutrition abdominal operation

Theoretical Study of Electron Transferin Bimolecular System of NH_3 and H_2O

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Chinese Journal of Structural Chemistry 2001年第5期20卷 339-343页

作者： fan jian-Fen XIA Qi-Ying B.van de Graaf XIAO He-Ming S.L.Njo Department of Chemistry Suzhou UniversitySuzhou 215006 China Faculty of Chemical Engineering and Material Science Delft University of TechnologyJulianalaan 136262 DelftNetherlands Department of Chemistry Nanjing University of Science and TechnologyNanjing 210094China

Mulliken, NPA, MK and CHelpG population analyses have been accomplished at the level of MP2/6-31G（d,p） for the title system. The variations of four kinds of charges on NH3 with intermolecular distance infer that electron transfers from NH3 to H2O. MK and CHelpG population analyses indicate more electron transfer than Mulliken and NPA ones. The atomic charges resulted from MK and CHelpG schemes infer that electron transfers from N in NH3 to H in H2O, which confirms that this bimolecular complex possesses linear structure as H3N…HOH.

关键词： bimolecular system of NH_3 and H_2O electron transfer MK and CHelpG charges ab initio calculation

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丘陵山地拖拉机折腰壳体仿真分析

农业工程 2024年第9期14卷 86-91页

作者：赵文科付帅潘龙龙张延功樊建朱昊潍柴雷沃智慧农业科技股份有限公司山东潍坊261200

针对丘陵山地拖拉机底盘受载工况恶劣,折扭壳体强度不足造成易断裂问题,在颠簸、斜坡和转向3种工况下运用Nastran和Hypermesh联合建立有限仿真分析模型进行校核计算。根据仿真分析结果判断壳体结构的合理性,通过改变折腰壳体结构设计使... 详细信息

针对丘陵山地拖拉机底盘受载工况恶劣,折扭壳体强度不足造成易断裂问题,在颠簸、斜坡和转向3种工况下运用Nastran和Hypermesh联合建立有限仿真分析模型进行校核计算。根据仿真分析结果判断壳体结构的合理性,通过改变折腰壳体结构设计使强度安全系数有效提升,经过3种工况的折腰壳体强度专项试验验证,并通过超声波仪器对壳体薄弱部位进行物理探伤,壳体无损害现象。试验结果验证了折腰壳体理论设计和仿真分析的可靠性及可行性。

关键词：丘陵山地拖拉机折腰壳体有限元校核计算物理探伤

GPRC5B protects osteoarthritis by regulation of autophagy signaling

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药学学报:英文版 2023年第7期13卷 2976-2989页

作者： Liang He Ziwei Xu Xin Niu Rong Li fanhua Wang Yu You Jingduo Gao Lei Zhao Karan M.Shah jian fan Mingyao Liu jian Luo Yangzhi Rehabilitation Hospital(Shanghai Sunshine Rehabilitation Center) Tongji University School of MedicineShanghai 201613China Shanghai Key Laboratory of Regulatory Biology Institute of Biomedical Sciences and School of Life SciencesEast China Normal UniversityShanghai 200241China Department of Oncology and Metabolism the Medical Schoolthe University of SheffieldSheffield S102TNUK Department of Orthopedics Tongji HospitalTongji University School of MedicineShanghai 200092China

Osteoarthritis(OA)is one of the most common chronic diseases in the ***,current treatment modalities mainly relieve pain and inhibit cartilage degradation,but do not promote cartilage *** this study,we show that G protein-coupled receptor class C group 5 member B(GPRC5B),an orphan G-protein-couple receptor,not only inhibits cartilage degradation,but also increases cartilage regeneration and thereby is protective against *** observed that Gprc5b deficient chondrocytes had an upregulation of cartilage catabolic gene expression,along with downregulation of anabolic genes in ***,mice deficient in Gprc5b displayed a more severe OA phenotype in the destabilization of the medial meniscus(DMM)induced OA mouse model,with upregulation of cartilage catabolic factors and downregulation of anabolic factors,consistent with our in vitro *** of Gprc5b by lentiviral vectors alleviated the cartilage degeneration in DMM-induced OA mouse model by inhibiting cartilage degradation and promoting *** also assessed the molecular mechanisms downstream of Gprc5b that may mediate these observed effects and identify the role of protein kinase B(AKT)-mammalian target of rapamycin(m TOR)-autophagy signaling ***,we demonstrate an integral role of GPRC5B in OA pathogenesis,and activation of GPRC5B has the potential in preventing the progression of OA.

关键词： Osteoarthritis GPRC5B Cartilage Chondrocyte Cartilage anabolism and catabolism Cartilage regeneration Autophagy Drug target