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Stability assessment of tree ring growth of Pinus armandii Franch in response to climate change based on slope directions at the Lubanling in the Funiu Mountains,China

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High-resolution reconstruction of April-September precipitation and major extreme droughts in China over the past∼530 years

林业研究（英文版） 2024年第2期 201页

作者： Jinkuan Li jianfeng peng Xiaoxu Wei Meng peng Xuan Li Yameng Liu Jiaxin Li

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Science Bulletin 2024年第17期69卷 2756-2764页

作者： Yongxiang Zhang Hongli Wang Xuemei Shao Hongbin Liu Haifeng Zhu Lily Wang Eryuan Liang Zhixin Hao Xiuqi Fang Qibin Zhang Jinjian Li Xinghe Shi Yujiang Yuan Feng Chen Tongwen Zhang Ruibo Zhang Huaming Shang jianfeng peng National Climate Centre China Meteorological AdministrationBeijing 100081China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Beijing New Epoch School the Administrative Bureau of Chinese Academy of SciencesBeijing 100086China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Alpine Ecology Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China School of Atmospheric Sciences Plateau Atmosphere and Environment Key Laboratory of Sichuan ProvinceChengdu University of Information TechnologyChengdu 610225China Qinghai Climate Centre Xining 810001 China Key Laboratory of Tree-Ring Physical and Chemical Research of China Meteorological Administration Key Laboratory of Tree-Ring Ecology of Xinjiang Uygur Autonomous RegionInstitute of Desert MeteorologyChina Meteorological AdministrationUrumqi 830002China Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security Institute of International Rivers and Eco-SecurityYunnan UniversityKunming 650000China College of Geography and Environmental Science Henan UniversityKaifeng 475004China

Extreme drought events have increased,causing serious losses and damage to the social economy under current warming ***,short-term meteorological data limit our understanding and projection of these *** the accumulation of proxy data,especially tree-ring data,large-scale precipitation field reconstruction has provided opportunities to explore underlying mechanisms *** point-by-point regression,we reconstructed the April-September precipitation field in China for the past~530 years on the basis of 590 proxy records,including 470 tree-ring width chronologies and 120 drought/flood *** regression models explained average 50%of the variance in *** the statistical test on calibration and verification,our models passed the significance level that assured reconstruction *** reconstruction data performed well,showing consistency and better quality than previously reported *** first three leading modes of variability in the reconstruction revealed the main distribution modes of precipitation over ***/drought and extremely wet/drought years accounted for 12.81%/10.92%(68 years/58 years)and 1.69%/3.20%(9 years/17 years)of the past~530 years in China,*** extreme drought events can be identified explicitly in our *** detailed features of the Chongzhen Great Drought(1637-1643),the Wanli Great Drought(1585-1590),and the Ding-Wu Great Famine(1874-1879),indicated the existence of potentially different underlying mechanisms that need further *** further improvements can be made for remote uninhabited areas and large deserts,our gridded reconstruction of April-September precipitation in China over the past~530 years can provide a solid database for studies on the attribution of climate change and the mechanism of extreme drought events.

关键词： Precipitation reconstruction Tree rings Historical documents Precipitation variability Extreme droughts

Enhanced photoelectrocatalytic degradation of ammonia by in situ photoelectrogenerated active chlorine on TiO_2 nanotube electrodes

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Journal of Environmental Sciences 2016年第12期28卷 103-108页

作者： Shuhu Xiao Dongjin Wan Kun Zhang Hongbin Qu jianfeng peng State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences School of Chemistry and Chemical Engineering Henan University of Technology

TiO2 nanotube （TINT） electrodes anodized in fluorinated organic solutions were successfully prepared on Ti sheets. Field-emission scanning electron microscopy （FE-SEM） and X-ray diffraction （XRD） were performed to characterize the TiNT electrodes. The linear voltammetry results under irradiation showed that the TiNT electrode annealed at 450℃ presented the highest photoelectrochemical activity. By combining photocatalytic with electrochemical process, a significantly synergetic effect on ammonia degradation was observed with Na2SO4 as supporting electrolyte at pH 10.7. Furthermore, the photoelectrocatalytic efficiency on the ammonia degradation was greatly enhanced in presence of chloride ions without the limitation ofpH. The degradation rate was improved by 14.8 times reaching 4.98 × 10^-2 min^-1 at pH 10.7 and a faster degradation rate of 6.34 × 10^-2 min^-1 was obtained at pH 3.01. The in situ photoelectrocatalytic generated active chlorine was proposed to be responsible for the improved efficiency. On the other hand, an enhanced degradation of ammonia using TiNT electrode fabricated in fluorinated organic solution was also confirmed compared to TiNT electrode anodized in fluorinated water solution and TiO2 film electrode fabricated by sol-gel method. Finally, the effect of chloride concentration was also discussed.

关键词： TiO2 nanotube electrodes Ammonia Photoelectrocatalytic process Enhanced degradation

Phosphate recovery from anaerobic digester effluents using CaMg(OH)_4

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Journal of Environmental Sciences 2016年第6期28卷 260-268页

作者： Xueyu Liu Zhonghou Xu jianfeng peng Yonghui Song Xiaoguang Meng State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences College of Water Sciences Beijing Normal University Center for Environmental Engineering Stevens Institute of Technology

Dolomite lime（DL）（CaMg（OH）4） was used as an economical source of Mg^2＋for the removal and recovery of phosphate from an anaerobic digester effluent of a municipal wastewater treatment plant（MWWTP） wastewater. Batch precipitation results determined that phosphate was effectively reduced from 87 to less than 4 mg-P/L when the effluent water was mixed with 0.3 g/L of DL. The competitive precipitation mechanisms of different solids in the treatment system consisting of Ca^2＋–Mg^2＋–NH4^＋–PO4^3-CO3^2-were determined by comparing model predictions with experimental results. Thermodynamic model calculations indicated that hydroxyapatite（Ca10（PO4）6（OH）2）, Ca4H（PO4）3·3H2O, Ca3（PO4）2（beta）, and Ca3（PO4）2（am2）were more stable than struvite（MgNH4PO36·H2O） and calcite（CaCO3）. However, X-ray diffraction（XRD） analysis determined the formation of struvite and calcite minerals in the treated effluent. Kinetic experimental results showed that most of the phosphate was removed from synthetic effluent containing NH4^＋within 2 hr, while only 20% of the PO4^3-was removed in the absence of NH4^＋after 24 hr of treatment. The formation of struvite in the DL-treated effluent was due to the rapid precipitation rate of the mineral. The final pH of the DL-treated effluent significantly influenced the mass ratio of struvite to calcite in the precipitates. Because more calcite was formed when the p H increased from 8.4 to 9.6, a pH range of 8.0–8.5 should be used to produce solid with high PO4^3-content. This study demonstrated that DL could be used for effective removal of phosphate from the effluent and that resultant precipitates contained high content of phosphate and ammonium.

关键词： Phosphorus recovery Struvite Crystallization Supernatant

Fretting Wear Behavior of Medium Carbon Steel Modified by Low Temperature Gas Multi-component Thermo-chemical Treatment

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Chinese Journal of Mechanical Engineering 2010年第3期23卷 288-296页

作者： LUO Jun ZHENG jianfeng peng Jinfang HE Liping ZHU Minhao Traction Power State Key Laboratory Southwest Jiaotong University Chengdu 610031 China

The introduction of surface engineering is expected to be an effective strategy against fretting damage. A large number of studies show that the low gas multi-component （such as carbon, nitrogen, sulphur and oxygen, etc） thermo-chemical treatment（LTGMTT） can overcome the brittleness of nitriding process, and upgrade the surface hardness and improve the wear resistance and fatigue properties of the work-pieces significantly. However, there are few reports on the anti-fretting properties of the LTGMTT modified layer up to now, which limits the applications of fretting. So this paper discusses the fretting wear behavior of modified layer on the surface of LZ50 （0.48%C） steel prepared by low temperature gas multi-component thermo-chemical treatment （LTGMTT） technology. The fretting wear tests of the modified layer flat specimens and its substrate （LZ50 steel） against 52100 steel balls with diameter of 40 mm are carried out under normal load of 150 N and displacement amplitudes varied from 2 μm to 40 μm. Characterization of the modified layer and dynamic analyses in combination with microscopic examinations were performed through the means of scanning electron microscope（SEM）, optical microscope（OM）, X-ray diffraction（XRD） and surface profilometer. The experimental results showed that the modified layer with a total thickness of 60 μm was consisted of three parts, i.e., loose layer, compound layer and diffusion layer. Compared with the substrate, the range of the mixed fretting regime（MFR） of the LTGMTT modified layer diminished, and the slip regime（SR） of the modified layer shifted to the direction of smaller displacement amplitude. The coefficient of friction（COF） of the modified layer was lower than that of the substrate in the initial stage. For the modified layer, the damage in partial slip regime（PSR） was very slight. The fretting wear mechanism of the modified layer both in MFR and SR was abrasive wear and delamination. The modified layer presented better wear res

关键词： fretting wear fretting regimes low temperature gas multi-component thermo-chemical treatment(LTGMTT) modified layer medium carbon steel

Comparison and modeling of two biofilm processes applied to decentralized wastewater treatment

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Frontiers of Environmental Science & Engineering 2009年第4期3卷 412-420页

作者： Guanglei QIU Liancheng XIANG Yonghui SONG jianfeng peng Ping ZENG peng YUAN Chinese Research Academy of Environmental Sciences Beijing 100012China College of Water Science Beijing Normal UniversityBeijing 100875China

In order to control water pollution in the rapidly urbanizing South China area,biological contact oxidation(BCO)process and biological aerated filter(BAF)process were applied in a pilot-scale experiment for decentralized wastewater *** investigation to find the optimal parameters of the two biofilm systems was conducted on hydraulic loading,organic loading,and aeration *** results indicated that the water reuse criteria required a maximum hydraulic and organic loading of 30.0 m^(3)/(m^(2)·d)and 4.0 kg COD/(m^(3)·d),respectively,as well as a minimum effluent DO of 4.0 mg/*** utilization of a new media allowed BAF to perform better than *** kinetic description of the COD removal process for BAF and BCO are Se=S0e^(-0.639t)/(1+1.035t),and S_(e)=S_(0)/[(1+0.947t)(1+1.242t)],*** correlativity analysis showed that the two models could predict the effluent water quality based on the hydraulic retention ***,the appropriate hydraulic loading for certain effluent water quality demands could be *** two models could be applied to wastewater treatment practice.

关键词： biological contact oxidation biological aerated filter decentralized wastewater treatment kinetic model

Climate-growth relationships of Pinus tabuliformis along an altitudinal gradient on Baiyunshan Mountain, Central China

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Chemotherapy-free radiotherapy combined with immune checkpoint inhibitors:a new regimen for locally advanced non-small cell lung cancer?

林业研究（英文版） 2024年第1期 206页

作者： Xiaoxu Wei jianfeng peng Jinbao Li Jinkuan Li Meng peng Xuan Li Yameng Liu Jiaxin Li

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Cancer Biology & Medicine 2023年第12期20卷 1035-1046页

作者： Lin Ma Liufu Deng jianfeng peng Jinming Yu Xiangjiao Meng Department of Oncology Renmin Hospital of Wuhan UniversityWuhan 430000China Department of Radiation Oncology Shandong Cancer Hospital and InstituteShandong First Medical University and Shandong Academy of Medical SciencesJinan 250117China School of Pharmacy Shanghai Jiao Tong UniversityShanghai 200240China

Maintenance immunotherapy after concurrent chemoradiotherapy remains the standard therapeutic approach in patients with unresectable locally advanced non-small cell lung cancer(LA-NSCLC).The efficacy of pembrolizumab without chemotherapy in stage IV NSCLC has incited interest in similar approaches for *** recent investigations involving the synergistic potential of immunotherapy combined with radiotherapy(i RT)have generated encouraging *** review discusses the existing studies and prospective directions of chemotherapy-free i RT strategies in unresectable *** the initial findings of chemotherapy-free i RT strategies have shown promising efficacy,we must consider the methodologic limitations of current studies and the myriad of challenges that accompany the implementation of chemotherapy-free i *** challenges include determining the optimal dose and fractionation,precise target volume delineation,and identification of additional suitable patient ***,the feasibility of chemotherapy-free i RT as a novel treatment modality for select patients with LA-NSCLC is contingent upon validation through randomized phase III trials.

关键词： Locally advanced non-small cell lung cancer(LA-NSCLC) radiotherapy immunotherapy new regimen challenges

Dendroclimatological study of Sabina saltuaria and Abies faxoniana in the mixed forests of the Qionglai Mountains, eastern Tibetan Plateau

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