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| 1 | Microbial reduction of uranium(Ⅵ)by Bacillus sp.Dwc-2:A macroscopic and spectroscopic study显示文摘The microbial reduction of U(VI) by Bacillus sp. dwc-2, isolated from soil in Southwest China,was explored using transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS) and X-ray absorption near edge spectroscopy(XANES). Our studies indicated that approximately 16.0% of U(VI) at an initial concentration of 100 mg/L uranium nitrate could be reduced by Bacillus sp. dwc-2 at pH 8.2 under anaerobic conditions at room temperature.Additionally, natural organic matter(NOM) played an important role in enhancing the bioreduction of U(VI) by Bacillus sp. dwc-2. XPS results demonstrated that the uranium presented mixed valence states(U(VI) and U(IV)) after bioreduction, which was subsequently confirmed by XANES. Furthermore, the TEM and high resolution transmission electron microscopy(HRTEM) analysis suggested that the reduced uranium was bioaccumulated mainly within the cell and as a crystalline structure on the cell wall.These observations implied that the reduction of uranium may have a significant effect on its fate in the soil environment in which these bacterial strains occur. | Xiaolong Li Congcong Ding Jiali Liao Liang Du Qun Sun Jijun Yang Yuanyou Yang Dong Zhang Jun Tang Ning Liu | 2017 | Journal of Environmental Sciences2017，29，3： | 8 |
| 2 | Bioaccumulation characterization of uranium by a novel Streptomyces sporoverrucosus dwc-3显示文摘The biosorption mechanisms of uranium on an aerobic bacterial strain Streptomyces sporoverrucosus dwc-3,isolated from a potential disposal site for(ultra-)low uraniferous radioactive waste in Southwest China,were evaluated by using transmission electron microscopy(TEM),energy dispersive X-ray(EDX)analysis,Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),proton induced X-ray emission(PIXE)and enhanced proton backscattering spectrometry(EPBS).Approximately60% of total uranium at an initial concentration of 10 mg/L uranium nitrate solution could be absorbed on 100 mg S.sporoverrucosus dwc-3 with an adsorption capacity of more than3.0 mg/g(wet weight)after 12 hr at room temperature at p H 3.0.The dynamic biosorption process of S.sporoverrucosus dwc-3 for uranyl ions was well described by a pseudo second-order model.S.sporoverrucosus dwc-3 could accumulate uranium on cell walls and within the cell,as revealed by SEM and TEM analysis as well as EDX spectra.XPS and FT-IR analysis further suggested that the absorbed uranium was bound to amino,phosphate and carboxyl groups of the cells.Additionally,PIXE and EPBS results confirmed that ion exchange also contributed to the adsorption process of uranium. | Xiaolong Li Congcong Ding Jiali Liao Liang Du Qun Sun Jijun Yang Yuanyou Yang Dong Zhang Jun Tang Ning Liu | 2016 | Journal of Environmental Sciences2016，28，3： | 5 |
| 3 | N-Type Mg_(3)Sb_(2-x)Bi_(x) Alloys as Promising Thermoelectric Materials显示文摘N-type Mg_(3)Sb_(2-x)Bi_(x) alloys have been extensively studied in recent years due to their significantly enhanced thermoelectric figure of merit(zT),thus promoting them as potential candidates for waste heat recovery and cooling applications.In this review,the effects resulting from alloying Mg_(3)Bi_(2) with Mg_(3)Sb_(2),including narrowed bandgap,decreased effective mass,and increased carrier mobility,are summarized.Subsequently,defect-controlled electrical properties in n-type Mg_(3)Sb_(2-x)Bi_(x) are revealed.On one hand,manipulation of intrinsic and extrinsic defects can achieve optimal carrier concentration.On the other hand,Mg vacancies dominate carrier-scattering mechanisms(ionized impurity scattering and grain boundary scattering).Both aspects are discussed for Mg_(3)Sb_(2-x)Bi_(x) thermoelectric materials.Finally,we review the present status of,and future outlook for,these materials in power generation and cooling applications. | Hongjing Shang Zhongxin Liang Congcong Xu Jun Mao Hongwei Gu Fazhu Ding Zhifeng Ren | 2020 | Research2020，，1： | 4 |
| 4 | Mixed Aleatory-epistemic Uncertainty Modeling of Wind Power Forecast Errors in Operation Reliability Evaluation of Power Systems显示文摘As the share of wind power in power systems continues to increase, the limited predictability of wind power generation brings serious potential risks to power system reliability. Previous research works have generally described the uncertainty of wind power forecast errors(WPFEs) based on normal distribution or other standard distribution models, which only characterize the aleatory uncertainty. In fact, epistemic uncertainty in WPFE modeling due to limited data and knowledge should also be addressed. This paper proposes a multi-source information fusion method(MSIFM) to quantify WPFEs when considering both aleatory and epistemic uncertainties. An extended focal element(EFE) selection method based on the adequacy of historical data is developed to consider the characteristics of WPFEs. Two supplementary expert information sources are modeled to improve the accuracy in the case of insufficient historical data. An operation reliability evaluation technique is also developed considering the proposed WPFE model. Finally,a double-layer Monte Carlo simulation method is introduced to generate a time-series output of the wind power. The effectiveness and accuracy of the proposed MSIFM are demonstrated through simulation results. | Jinfeng Ding Kaigui Xie Bo Hu Changzheng Shao Tao Niu Chunyan Li Congcong Pan | 2022 | Journal of Modern Power Systems and Clean Energy2022，10，5： | 1 |
| 5 | Biosorption of uranium on Bacillus sp dwc-2:preliminary investigation on mechanism显示文摘 | Li Xiaolong Ding Congcong Liao Jiali | 2014 | Journal of enviroumentalradioactivity2014，135，： | 1 |
| 6 | Observed characteristics of tidal currents and mean flow in the northern Yellow Sea显示文摘Several bottom-mounted Acoustic Doppler Current Profiler (ADCP) moorings were deployed in the northern Yellow Sea (NYS) during the four seasons of 2006–2007 and also the summertime of 2009. A synthesis analysis on the time-continuous records was performed to examine the characteristics and variations of tidal currents and mean flow over the observation period at these stations. Tidal currents accounted for ~75% of the total kinetic energy, with the absolute dominance of M2 constituent. Visible vertical variations of tidal flow were found on all sites, featured by the decrease of amplitude, increase of rotation rate as well as a decreasing trend of the phase for M2 component with depth. A notable exception was in the central NYS, where the maximum tidal currents occurred in the upper or middle layers (~20–40 m) instead of near the surface (<10 m). The observed mean flow was relatively weak, smaller than 15 cm/s. Velocity on the northern end of Yellow Sea Trough (YST) was characterized by low magnitude and an obvious layered structure vertically. In the Bohai Strait (BS) and the northern slope area, the currents weakened and the flow direction presented a major trend to deflect counterclockwise with depth in most observations. Summertime cyclonic circulation around the Yellow Sea Cold Water Mass (YSCWM), its intensification on the frontal zone and the Yellow Sea Warm Current (YSWC) for the winter season were all evident by our direct current measurements. However, the details of water exchange through the BS appeared partly diff erent from the traditionally-accepted pattern. The vertical diff erences of tidal and mean flow were larger in summer than that in winter, implying the influence of thermal structure to the local currents. Aff ected by the water stratification, mean flow usually reached its maximum near the thermocline in spring and summer, while showing a nearly uniform vertical distribution during winter. | BI Congcong BAO Xianwen DING Yang ZHANG Cong WANG Yu SHEN Biao WAN Kai | 2019 | Journal of Oceanology and Limnology2019，37，2： | 1 |
| 7 | The sensitivity of numerical simulation to vertical mixing parameterization schemes: a case study for the Yellow Sea Cold Water Mass显示文摘The vertical mixing parameterization scheme,by providing the eff ects of some explicitly missed physical processes and more importantly closing the energy budgets,is a critical model component and therefore imposes signifi cant impacts on model performance.The Yellow Sea Cold Water Mass(YSCWM),as the most striking and unique phenomenon in the Yellow Sea during summer,is dramatically aff ected by vertical mixing process during its each stage and therefore seriously sensitive to the proper choice of parameterization scheme.In this paper,a hindcast of YSCWM in winter of 2006 was implemented by using the Regional Ocean Modeling System(ROMS).Three popular parameterization schemes,including the level 2.5 Mellor-Yamada closure(M-Y 2.5),Generic Length Scale closure(GLS)and K-Profi le Parameterization(KPP),were tested and compared with each other by conducting a series of sensitivity model experiments.The infl uence of diff erent parameterization schemes on modeling the YSCWM was then carefully examined and assessed based on these model experiments.Although reasonable thermal structure and its seasonal variation were well reproduced by all schemes,considerable diff erences could still be found among all experiments.A warmer and spatially smaller simulation of YSCWM,with very strong thermocline,appeared in M-Y 2.5 experiment,while a spatially larger YSCWM with shallow mixed layer was found in GLS and KPP schemes.Among all the experiments,the discrepancy,indicated by core temperature,appeared since spring,and grew gradually by the end of November.Additional experiments also confi rmed that the increase of background diff usivity could eff ectively weaken the YSCWM,in either strength or coverage.Surface wave,another contributor in upper layer,was found responsible for the shrinkage of YSCWM coverage.The treatment of wave eff ect as an additional turbulence production term in prognostic equation was shown to be more superior to the strategy of directly increasing diff usivity for a coastal region. | Congcong BI Zhigang YAO Xianwen BAO Cong ZHANG Yang DING Xihui LIU Junru GUO | 2021 | Journal of Oceanology and Limnology2021，39，1： | 0 |
| 8 | Environmental hypoxia induces apoptosis in large yellow croaker Larimichthys crocea via both intrinsic and extrinsic pathways显示文摘Hypoxia has become an unfavorable factor affecting the sustainable development of the large yellow croaker Larimichthys crocea,an economically important mariculture fish in China.Apoptosis is a consequence of hypoxia on fish.However,the effects of hypoxia stress on apoptosis in L.crocea remain largely unknown.We investigated the effect of environmental hypoxia on apoptosis in L.crocea.Results show that hypoxia induced apoptosis in L.crocea both in vivo and in vitro.The mitochondrial membrane potential was significantly reduced in large yellow croaker fry(LYCF)cells.The expression levels of Bcell lymphoma/leukemia-2(Bcl-2)m RNA and protein were also significantly decreased in the liver and LYCF cells during 96 h and 48 h of hypoxia stress,respectively,whereas the expression level of Bcl-2 associated X(Bax)mRNA,Casp3 mRNA,and activity of caspase-3/7/9 were significantly increased,indicating that hypoxia induced caspase-dependent intrinsic apoptosis in L.crocea.The expression level of the apoptosis-inducing factor(AIF)protein was significantly increased in the liver and LYCF cells.The level of AIF protein was significantly decreased in the cytoplasm but increased in the nuclei of L.crocea,demonstrating that hypoxia induced the AIF-mediated caspase-independent intrinsic apoptosis.In addition,the activity of caspase-8 was significantly increased,indicating that hypoxia stress induced extrinsic apoptosis in L.crocea.Therefore,hypoxia induced apoptosis in L.crocea through both the intrinsic and extrinsic pathways.The present study accumulated basic biological information to help elucidate the mechanism of hypoxia response in marine fish. | Shengyu LUO Cheng LIU Xinming GAO Jingqian WANG Yibo ZHANG Jie DING Congcong HOU Junquan ZHU Bao LOU Weiliang SHEN Xiongfei WU Chundan ZHANG | 2023 | Journal of Oceanology and Limnology2023，41，6： | 0 |
| 9 | Recent progress on Sn_(3)O_(4)nanomaterials for photocatalytic applications显示文摘Tin(IV)oxide(Sn_(3)O_(4))is layered tin and exhibits mixed valence states.It has emerged as a highly promising visible-light pho-tocatalyst,attracting considerable attention.This comprehensive review is aimed at providing a detailed overview of the latest advance-ments in research,applications,advantages,and challenges associated with Sn_(3)O_(4)photocatalytic nanomaterials.The fundamental con-cepts and principles of Sn_(3)O_(4)are introduced.Sn_(3)O_(4)possesses a unique crystal structure and optoelectronic properties that allow it to ab-sorb visible light efficiently and generate photoexcited charge carriers that drive photocatalytic reactions.Subsequently,strategies for the control and improved performance of Sn_(3)O_(4)photocatalytic nanomaterials are discussed.Morphology control,ion doping,and hetero-structure construction are widely employed in the optimization of the photocatalytic performance of Sn_(3)O_(4)materials.The effective imple-mentation of these strategies improves the photocatalytic activity and stability of Sn_(3)O_(4)nanomaterials.Furthermore,the review explores the diverse applications of Sn_(3)O_(4)photocatalytic nanomaterials in various fields,such as photocatalytic degradation,photocatalytic hydro-gen production,photocatalytic reduction of carbon dioxide,solar cells,photocatalytic sterilization,and optoelectronic sensors.The discus-sion focuses on the potential of Sn_(3)O_(4)-based nanomaterials in these applications,highlighting their unique attributes and functionalities.Finally,the review provides an outlook on the future development directions in the field and offers guidance for the exploration and de-velopment of novel and efficient Sn_(3)O_(4)-based nanomaterials.Through the identification of emerging research areas and potential avenues for improvement,this review aims to stimulate further advancements in Sn_(3)O_(4)-based photocatalysis and facilitate the translation of this promising technology into practical applications. | Xin Yu Congcong Li Jian Zhang Lili Zhao Jinbo Pang Longhua Ding | 2024 | International Journal of Minerals,Metallurgy and Materials2024，31，2： | 0 |
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