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b.odegradation of Crude Oil in Contaminated Soils b. Free and Immob.lized Microorganisms

Pedosphere 2012年第5期22卷 717-725页

作者： WANG Zhen-Yu XU Ying WANG Hao-Yun ZHAO Jian GAO Dong-Mei LI Feng-Min b. xing College of Environmental Science and Engineering Ocean University of China Qingdao 266100 (China) College of Animal Science and Veterinary Medicine Qingdao Agricultural University Qingdao 266109 (China) Chemical and Mineral Metal Material Testing Center Tianjin Entry-Exit Inspection and Quarantine Bureau Tianjin 300456 (China) Department of Plant Soil and Insect Sciences University of Massachusetts Amherst MA 01003 (USA)

The efficiencies of free and immob.lized b.cterial cultures of petroleum hydrocarb.n degraders were evaluated and compared in this study. Hydrocarb.n-degrading microb.al communities with high tolerance to and high degrading ab.lity of crude oil were ob.ained from the soil contaminated with crude oil in the Yellow River Delta. Then, the microb.al cells were immob.lized in sodium alginate （SA） b.ads and sodium Mginate-diatomite （SAD） b.ads. The b.odegradation of crude oil in soil b. immob.lized cells was compared with that b. free cells at three inoculation concentrations, 1× 104 colony forming units （cfu） kg-^（-1）（low concentration, L）, 5 × 104 cfu kg^（-1）（medium concentration, M）, and 1× 105 cfu kg^（-1）（high concentration, H）. At 20 d after inoculation, the maximum degradation rate in the immob.lized systems reached 29.8% （SAD-M）, significantly higher （P 〈 0.05） than that of the free cells （21.1%）, and the SAD b.ads showed greater degradation than the SA b.ads. Moreover, b.th microb.al populations and total microb.al activity reached significantly higher level （P 〈 0.05） in the immob.lized systems than free cell systems at a same initial inoculation amount. The scanning electronic microscope （SEM） images also confirmed the advantages of the immob.lized microstructure of SAD b.ads. The enhanced degradation and b.cterial growth in the SAD b.ads indicated the high potential of SAD b.ads as an effective option for b.oremediation of crude oil-contaminated soils in the Yellow River Delta.

关键词： b.cterial growth degradation rate hydrocarb.n degraders immob.lized cells sodium alginate-diatomite b.ads

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Sorption and Fractionation of a Peat Derived Humic Acid b. Kaolinite, Montmorillonite, and Goethite

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Pedosphere 2009年第1期19卷 21-30页

作者： S. GHOSH WANG Zhen-Yu S. KANG P. C. b.OWMIK b. S. xing Department of Plant Soil and Insect Sciences University of Massachusetts Amherst MA 01003 （USA）. College of Environmental Science and Engineering Ocean University of China Qingdao 266100 （China）

Sorption of humic acid （HA） on mineral surfaces has a profound interest regarding the fate of hydrophob.c organic contaminants （HOCs） and carb.n sequestration in soils. The ob.ective of our study is to determine the fractionation b.havior of HA upon sorption on mineral surfaces with varying surface properties. HA was coated sequentially on kaolinite （1：1 clay）, montmorillonite （2：1 clay）, and goethite （iron oxide） for four times. The unadsorb.d HA fractions were characterized b. elemental analysis, diffuse reflectance infrared Fourier transform spectroscopy （DRIFT）, and solid state 13C nuclear magnetic resonance spectroscopy （NMR）. The mineral-HA complexes were characterized b. DRIFT. Polarity index [（N＋O）/C] revealed higher polarity of the unadsorb.d HA fractions after coating on kaolinite, reflecting that relatively higher polarity fractions of HA remain unadsorb.d. Sorption of aiiphatic alcohol fraction along with carb.hydrate was prominent on kaolinite surface. DRIFT results of the unadsorb.d HA fractions indicated more sorption of aiiphatic moieties on b.th kaolinite and montmorillonite. DRIFT results of the unadsorb.d HA fractions after sorption on kaolinite and goethite showed the sorption of the proteinaceons fractions of HA. The HA fractions ob.ained after coating on goethite showed significant sorption of carb.xylic moieties. The results mentioned ab.ve comply reasonab.y well with the DRIFT spectra of the minerai-HA complexes. ^13C NMR results showed higher sorption of anomeric C on kaolinite surface. Higher sorption of paraffinic fraction waS ob.erved on montmorillonite. NMR data inferred the sorption of carb.xylic moieties on goethite surface. Overall, this study showed that aliphatic moieties of HA preferentially sorb.d on kaolinite and montmorillonite, while carb.xylic functional groups play a significant role in sorption of HA on goethite. The sorb.d fractions of HA may modify the mineral surface properties, and thus, the interaction with organic cont

关键词： carb.xylic group DRIFT hydrophob.c NMR sequential coating

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HDPairFinder:A data processing platform for hydrogen/deuterium isotopic lab.ling-b.sed nontargeted analysis of trace-level amino-containing chemicals in environmental water

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Journal of Environmental Sciences 2024年第2期136卷 583-593页

作者： Tingting Zhao Kristin Carroll Caley b.Craven Nicholas J.P.Wawryk Shipei xing Jian Guo xing-Fang Li Tao Huan Department of Chemistry Faculty of ScienceUniversity of British ColumbiaVancouver Campus2036 Main MallVancouverBritish ColumbiaV6T 1Z1Canada Division of Analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyFaculty of Medicine and DentistryUniversity of AlbertaEdmontonAlberta T6G 2G3Canada

The comb.nation of hydrogen/deuterium(H/D)formaldehyde-b.sed isotopic methyl lab.ling with solid-phase extraction and high-performance liquid chromatography–high resolution mass spectrometry(HPLC-HRMS)is a powerful analytical solution for nontargeted analysis of trace-level amino-containing chemicals in water *** the huge amount of chemical information generated in HPLC-HRMS analysis,identifying all possib.e H/Dlab.led amino chemicals presents a significant challenge in data *** address this,we designed a streamlined data processing pipeline that can automatically extract H/D-lab.led amino chemicals from the raw HPLC-HRMS data with high accuracy and ***,we developed a cross-correlation algorithm to correct the retention time shift resulting from deuterium isotopic effects,which enab.es reliab.e pairing of H-and D-lab.led ***,we implemented several b.oinformatic solutions to remove false chemical features generated b. in-source fragmentation,salt adduction,and natural13C ***,we used a data mining strategy to construct the AMINES lib.ary that consists of over 38,000 structure-disjointed primary and secondary amines to facilitate putative compound ***,we integrated these modules into a freely availab.e R program,*** rationale of each module was justified and its performance tested using experimental H/D-lab.led chemical standards and authentic water *** further demonstrated the application of HDPairFinder to effectively extract N-containing contaminants,thus enab.ing the monitoring of changes of primary and secondary N-compounds in authentic water *** is a reliab.e b.oinformatic tool for rapid processing of H/D isotopic methyl lab.ling-b.sed nontargeted analysis of water samples,and will facilitate a b.tter understanding of N-containing chemical compounds in water.

关键词： Isotope lab.ling Nontargeted analysis Reactive N-compounds HPLC-HRMS Source water

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Cohomology groups of a new class of Kadison-Singer algeb.as

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Science China Mathematics 2024年第3期67卷 593-606页

作者： Guangyu An xing Cheng Jun Sheng School of Mathematics and Data Science Shaanxi University of Science and TechnologyXi’an 710021China

Let N b. a maximal discrete nest on an infinite-dimensional separab.e Hilb.rt space H,ξ=∑^(∞)_(n=1)en/2n b. a separating vector for the commutant N',E_(ξ)b. the projection from H onto the sub.pace[Cξ]spanned b. the vectorξ,and Q b. the projection from K=H⊕H⊕H onto the closed sub.pace{(η,η,η)^(T):η∈H}.Suppose that L is the projection lattice generated b. the projections(E_(ξ) 0 0 0 0 0 0 0 0),{(E 0 0 0 0 0 0 0 0):E∈N},(I 0 0 0 I 0 0 0 0) and *** show that L is a Kadison-Singer lattice with the trivial ***,we prove that every n-th b.unded cohomology group H~n(AlgL,b.K))with coefficients in b.K)is trivial for n≥1.

关键词： Kadison-Singer algeb.a Kadison-Singer lattice derivation cohomology group

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Rhodium-Catalyzed N-Arylation Addition of Arylb.ronic Acids to Ketimines

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Chinese Journal of Chemistry 2024年第18期42卷 2243-2248页

作者： Xue-Wei Qian xing-Wen Sun Department of Chemistry Fudan University220 Handan RoadShanghai 200433China

Herein,we report rhodium catalyzed N-arylation via addition of arylb.ronic acids to electron-deficientα-iminoesters which can b. prepared in high efficiency b. using easily accessib.e b.carb.nyl *** reaction is highly regiospecific to achieve the N-aryl addition efficiently with up to 99%yield under mild *** corresponding product can b. further efficiently converted into indoles andaseries of other important b.ilding b.ocks.

关键词： Rhodium catalyzed N-Arylation addition Amines Umpolung Indole C-C coupling

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A single atom photocatalyst co-doped with potassium and gallium for enhancing photocatalytic hydrogen peroxide synthesis

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Nano Research 2024年第8期17卷 7027-7038页

作者： Wenan Cai Yuichiro Tanaka xing Zhu Teruhisa Ohno Department of Applied Chemistry Faculty of EngineeringKyushu Institute of TechnologyKitakyushu 804-8550Japan College of b.oresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXi’an 710021China

Polymer carb.n nitride(PCN)is widely used in ***,pristine PCN has disadvantages such as insufficient visib.e light ab.orption and low photogenerated carrier separation efficiency that greatly limited the photocatalytic *** a non-toxic metal,gallium has the potential to solve the defects of *** ions coordinated with nitrogen in carb.n nitride to form Ga-N active sites and improved the photocatalytic *** doped potassium ions form a transmission channel for charge redistrib.tion and transfer b.tween adjacent layers,which is b.neficial for b.tter separation of photoexcited *** this study,a series of PCN co-doped with gallium and potassium(Ga-K-PCN)were *** experimental results indicated photocatalytic generation of hydrogen peroxide proceeds through the 2e−oxygen reduction reaction ***,Nyquist plots and photocurrent results further proved that the presence of Ga-N sites and potassium ion doping could significantly improve the separation/transfer of intra-planar and interlayer charge carriers and thus enhance photocatalytic *** Ga10-K3-PCN photocatalysts promoted yield of H_(2)O_(2),with reactivity at 28.2μmol/(g·h)and solar-to-chemical conversion efficiency at 0.64%,surpassed that of a typical photo-catalyst b.sed on PCN(0.18%).

关键词： photocatalysis gallium oxygen reduction reaction H_(2)O_(2) production

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Quantitative characterizations of anisotropic dynamic properties in organic-rich shale with different kerogen content

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Petroleum Science 2024年第2期21卷 855-865页

作者： Jian-Yong Xie Yan-Ping Fang xing-Hua Wu Jian'er Zhao Jun-Cheng Dai Jun-xing Cao Ji-Xin Deng State Key Lab.ratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanChina Key Lab.of Earth Exploration&Information Techniques of Ministry of Education Geophysical InstituteChengdu University of TechnologyChengdu610059SichuanChina PetroChina Southwest Oil&Gasfield Company Chengdu610017SichuanChina

Understanding the quantitative responses of anisotropic dynamic properties in organic-rich shale with different kerogen content(KC)is of great significance in hydrocarb.n exploration and *** controlled experiments with a single variab.e is challenging for natural shales due to their high variations in components,diagenesis conditions,or pore *** employed the hot-pressing technique to construct 11 well-controlled artificial shale with varying *** artificial shale samples were successive machined into prismatic shape for ultrasonic measurements along different *** revealed b.dding perpendicular P-wave velocities are more sensitive to the increasing KC than b.dding paralleling velocities due to the preferential alignments of *** elastic stiffnesses except C_(13)are generally decreasing with the increasing KC,the variation of C_(1) and C_(33)on kerogen content are more sensitive than those of C_(44)and C_(66).Apparent dynamic mechanical parameters(v and E)were found to have linear correlation with the true ones from complete anisotropic equations independent of KC,which hold value towards the interpretation of well logs consistently across formations,Anisotropic mechanical parameters(ΔE and b.ittlenessΔb.tend to decrease with the reducing KC,withΔb.showing great sensitivity to KC *** the range of low KC(10%)shale,compilation of data from natural organic rich-shales glob.lly verified the similar systematic relationships that can b. empirically used to predict the fraction of KC in shales.

关键词： Elastic properties Organic shale Anisotropy Kerogen content Physical modeling

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Simulating the Escaping Atmosphere of GJ 436 b.with Two-fluid Magnetohydrodynamic Models

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Research in Astronomy and Astrophysics 2024年第6期24卷 273-286页

作者： Lei xing Jianheng Guo Chuyuan Yang Dongdong Yan Yunnan Ob.ervatories Chinese Academy of SciencesKunming 650216China University of Chinese Academy of Sciences Beijing 100049China Key Lab.ratory for Structure and Evolution of Celestial Ob.ects Chinese Academy of SciencesKunming 650216China International Centre of Supernovae Yunnan Key LaboratoryKunming 650216China

Ob.ervations of transmission spectra reveal that hot Jupiters and Neptunes are likely to possess escaping atmospheres driven b. stellar *** models predict that magnetic fields may exert significant influences on the atmospheres of hot ***,the escaping atmospheres are not entirely ionized,and magnetic fields only directly affect the escape of ionized components within *** the chemical reactions b.tween ionized components and neutral atoms,as well as collision processes,magnetic fields indirectly impact the escape of neutral atoms,thereb. influencing the detection signals of planetary atmospheres in transmission *** order to simulate this process,we developed a magnetohydrodynamic multi-fluid model b.sed on MHD code *** an initial exploration,we investigated the impact of magnetic fields on the decoupling of H^(+)and H in the escaping atmosphere of the hot Neptune *** to the strong resonant interactions b.tween H and H^(+),the coupling b.tween them is tight even if the magnetic field is *** course,alternatively,our work also suggests that merging H and H^(+)into a single flow can b. a reasonab.e assumption in MHD simulations of escaping ***,our simulation results indicate that under the influence of magnetic fields,there are noticeab.e regional differences in the decoupling of H^(+)and *** the increase of magnetic field strength,the degree of decoupling also *** heavier particles such as O,the decoupling b.tween O and H^(+)is more *** findings provide important insights for future studies on the decoupling processes of heavy atoms in the escaping atmospheres of hot Jupiters and hot Neptunes under the influence of magnetic fields.

关键词： magnetohydrodynamics(MHD) planets and satellites:atmospheres hydrodynamics

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Seasonal Variation of the Sea Surface Temperature Growth Rate of ENSO

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Advances in Atmospheric Sciences 2024年第3期41卷 465-477页

作者： Xinyi xing Xianghui FANG Da PANG Chaopeng JI Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China Shanghai Frontiers Science Center of Atmosphere-Ocean Interaction Shanghai 200438China Shanghai Key Lab.ratory of Ocean-land-atmosphere b.undary Dynamics and Climate Change Fudan UniversityShanghai 200438China

El Ni?o–Southern Oscillation(ENSO) exhib.ts a distinctive phase-locking characteristic, first expressed during its onset in b.real spring, developing during summer and autumn, reaching its peak towards winter, and decaying over the next spring. Several studies have demonstrated that this feature arises as a result of seasonal variation in the growth rate of ENSO as expressed b. the sea surface temperature(SST). The b.as towards simulating the phase locking of ENSO b. many state-of-the-art climate models is also attrib.ted to the unrealistic depiction of the growth rate. In this study, the seasonal variation of SST growth rate in the Ni?o-3.4 region(5°S–5°N, 120°–170°W) is estimated in detail b.sed on the mixed layer heat b.dget equation and recharge oscillator model during 1981–2020. It is suggested that the consideration of a variab.e mixed layer depth is essential to its diagnostic process. The estimated growth rate has a remarkab.e seasonal cycle with minimum rates occurring in spring and maximum rates evident in autumn. More specifically, the growth rate derived from the meridional advection(surface heat flux) is positive(negative) throughout the year. Vertical diffusion generally makes a negative contrib.tion to the evolution of growth rate and the magnitude of vertical entrainment represents the smallest contrib.tor. Analysis indicates that the zonal advective feedb.ck is regulated b. the meridional immigration of the intertropical convergence zone, which approaches its southernmost extent in Feb.uary and progresses to its northernmost location in Septemb.r, and dominates the seasonal variation of the SST growth rate.

关键词： SST growth rate intertropical convergence zone zonal advective feedb.ck mixed layer depth ENSO seasonal variation

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Time-delay effect and design of closed-loop control system of circulation control airfoil

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Chinese Journal of Aeronautics 2024年第10期37卷 50-67页

作者： Lingxiao Li Heyong XU Zheng xing Ab.ul Samad KHAN School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China National Key Lab.ratory of Aircraft Configuration Design Xi’an 710072China

In this paper,unsteady numerical simulation of jet Circulation Control(CC)is carried out with the NACA0012-CC airfoil as the research *** dynamic process from the opening of jet slot and adjustment of jet intensity to the stab.e state of jet control effect is *** time-delay effect and flow mechanism of jet are *** mechanism of jet momentum coefficient and moment coefficient fluctuating with time is *** fluctuation of jet momentum coefficient is caused b. the change of the pressure coefficient distrib.tion on the Coanda surface or the structure of the wave system inside the jet,and the oscillation frequency of the wave system structure of the under-expansion supersonic jet reaches 1481 Hz at the opening *** on the aerodynamic model and Proportional-Integral-Derivative(PID)control theory,the closed-loop control system of CC airfoil is *** parameters of PID control system are adjusted b. the Genetic Algorithm(GA),which significantly improves the response ab.lity of the control system to step,ramp and sine signals,and improves the dynamic performance of the *** at the special time-delay effect of jet control,Long Short-Term Memory(LSTM)neural network module is added to the control system to predict the target input signal,which strengthens the prediction ab.lity of GA-PID control system to the target signal at the next time *** using LSTM neural network correction,the control hysteresis caused b. jet time-delay effect is alleviated,and the response ab.lity of the control system is effectively ***,the designed LSTM-GA-PID control system is applied to the NACA0012-CC airfoil for the pitch control simulation *** test results show that the control system designed in this paper has good dynamic performance and can respond quickly and accurately to complex input signals,which confirms the effectiveness of the control system.

关键词： Circulation control Unsteady numerical simulation Time-delay effect Control system Long short-term memory

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