|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Facile biphasic catalytic process for conversion of monoterpenoids to tricyclic hydrocarbon biofuels显示文摘Terpenoids have drawn much attention to scientists in synthesizing high-performance bio-jet fuels due to their ring structures,which feature potential high densities.Here,a facile biphasic catalytic process has been developed for the production of high-density tricyclic hydrocarbon biofuels from a monoterpenoid,1,8-cineole,using sulfuric acid(H2SO4)as the homogeneous catalyst.A^100%conversion of 1,8-cineole and a>40%carbon yield of cyclic dimers were achieved at 100℃within two hours.The mechanism for the acid-catalyzed conversion of 1,8-cineole to cyclic hydrocarbon dimers were explored.In particular,the formation of the diene intermediates and the following dimerization of dienes was essential to synthesize tricyclic terpene dimers.The biphasic catalytic process accelerated the deoxygenation rate and enabled the dimerization with the aid of organic solvent while controlling the reaction rates to avoid the formation of solid residues.Moreover,this process also facilitated the product separation by organic solvent extraction while enabling easy recycle of the homogenous catalysts. | Shaoqu Xie Trong HHuynh Peiyong Qin Tianwei Tan Hongfei Lin | 2020 | Journal of Energy Chemistry2020，29，10： | 1 |
| 2 | The hemagglutinin structure of an avian HINI influenza A virus显示文摘 | Lin Tianwei Wang Gengyan Li Anzhang | 2009 | Virology2009，392，1： | 1 |
| 3 | In situ coagulation-electrochemical oxidation of leachate concentrate:A key role of cathodes显示文摘To efficiently remove organic and inorganic pollutants from leachate concentrate,an in situ coagulation-electrochemical oxidation(CO-EO)system was proposed using Ti/Ti_(4)O_(7)anode and Al cathode,coupling the“super-Faradaic”dissolution of Al.The system was evaluated in terms of the removal efficiencies of organics,nutrients,and metals,and the underlying cathodic mechanisms were investigated compared with the Ti/RuO_(2)-IrO_(2)and graphite cathode systems.After a 3-h treatment,the Al-cathode system removed 89.0%of COD and 36.3%of total nitrogen(TN).The TN removal was primarily ascribed to the oxidation of both ammonia and organic-N to N_(2).In comparison,the Al-cathode system achieved 3-10-fold total phosphorus(TP)(62.6%)and metal removals(>80%)than Ti/RuO_(2)-IrO_(2)and graphite systems.The increased removals of TP and metals were ascribed to the in situ coagulation of Al(OH)_(3),hydroxide precipitation,and electrodeposition.With the reduced scaling on the Al cathode surface,the formation of Al^(3+)and electrified Al(OH)_(3)lessened the requirement for cathode cleaning and increased the bulk conductivity,resulting in increased instantaneous current production(38.9%)and operating cost efficiencies(48.3 kWh kg_(COD)^(−1)).The present study indicated that the in situ CO-EO process could be potentially used for treating persistent wastewater containing high levels of organic and inorganic ions. | Huankai Li Qian Zeng Feixiang Zan Sen Lin Tianwei Hao | 2023 | Environmental Science and Ecotechnology2023，，4： | 0 |
| 4 | Algorithms and statistical analysis for linear structured weighted total least squares problem显示文摘Weighted total least squares(WTLS)have been regarded as the standard tool for the errors-in-variables(EIV)model in which all the elements in the observation vector and the coefficient matrix are contaminated with random errors.However,in many geodetic applications,some elements are error-free and some random observations appear repeatedly in different positions in the augmented coefficient matrix.It is called the linear structured EIV(LSEIV)model.Two kinds of methods are proposed for the LSEIV model from functional and stochastic modifications.On the one hand,the functional part of the LSEIV model is modified into the errors-in-observations(EIO)model.On the other hand,the stochastic model is modified by applying the Moore-Penrose inverse of the cofactor matrix.The algorithms are derived through the Lagrange multipliers method and linear approximation.The estimation principles and iterative formula of the parameters are proven to be consistent.The first-order approximate variance-covariance matrix(VCM)of the parameters is also derived.A numerical example is given to compare the performances of our proposed three algorithms with the STLS approach.Afterwards,the least squares(LS),total least squares(TLS)and linear structured weighted total least squares(LSWTLS)solutions are compared and the accuracy evaluation formula is proven to be feasible and effective.Finally,the LSWTLS is applied to the field of deformation analysis,which yields a better result than the traditional LS and TLS estimations. | Jian Xie Tianwei Qiu Cui Zhou Dongfang Lin Sichun Long | 2024 | Geodesy and Geodynamics2024，15，2： | 0 |
| 5 | Spatiotemporal variations and determinants of stream nitrogen and phosphorus concentrations from a watershed in the Three Gorges Reservoir Area,China显示文摘Socioeconomic development induced nonpoint source(NPS)pollution has aroused an increasing concern,however,most of the previous studies were concentrated on the impacts of environmental determinants.Here,total nitrogen(TN)and total phosphorus(TP)concentrations from 13 sampling sites were collected biweekly from January 2018 to October 2021,and 26 potential factors including environmental and socioeconomic were considered in the Wangjiaqiao watershed of the Three Gorges Reservoir Area,China.Impacts of these factors on TN and TP were evaluated by partial least squares regression(PLSR)model.It showed that average TN and TP concentrations in wet seasons(TN,14.68 mg L^(-1):TP,0.113 mg L^(-1))were higher than that in dry seasons(TN,11.73 mg L^(-1);TP,0.087 mg L^(-1)).Additionally,the TN concentrations were greater in downstream than upstream,however,the highest TP concentrations were found in the middle of the watershed.The optimal PLSR model explained 69.6%,73.1%and 66.1%of the variance in TN concentration,as well as 65.7%,79.5%and 67.4%of the variance in TP concentration during the annual,dry and wet seasons,respectively.Moreover,TN was primarily influenced by topographic wetness index,planting structure,interspersion and juxtaposition index,orchard proportion,nitrogen fertilization,per capita income,and catchment area,whereas TP was mainly controlled by slope gradient,topographic wetness index,hypsometric integral,interspersion and juxtaposition index,and population density.Collectively,environmental factors had greater impacts on the TN and TP concentrations than socioeconomic factors.Raising farmers'awareness of the hazards of NPS pollution is beneficial to watershed NPS pollution control. | Jun Deng Yiwen Zhou Lin Chu Yujie Wei Zhaoxia Li Tianwei Wang Cuiting Dai | 2023 | International Soil and Water Conservation Research2023，11，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员