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Degradation of polycyclic aromatic hydrocarbons by Pseudomonas ***2 isolated from active sewage sludge of chemical plant

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Journal of Environmental Sciences 2012年第12期24卷 2141-2148页

作者： jing ma Li Xu Lingyun Jia School of Life Science and Biotechnology Dalian University of TechnologyLiaoning 116023China

It is important to screen strains that can decompose polycyclic aromatic hydrocarbons （PAHs） completely and rapidly with good adaptability for bioremedlation in a local area. A bacterial strain JM2, which uses pbenanthrene as its sole carbon source, was isolated from the active sewage sludge from a chemical plant in Jilin, China and identified as Pseudomonas based on 16S rDNA gene sequence analysis. Although the optimal growth conditions were determined to be pH 6.0 and 37~C, JM2 showed a broad pH and temperature profile. At pH 4.5 and 9.3, JM2 could degrade more than 40% of fluorene and phenanthrene （50 mg/L each） within 4 days. In addition, when the temperature was as low as 4~C, JM2 could degrade up to 24% fluorene and 12% phenanthrene. This showed the potential for JM2 to be applied in bioremediation over winter or in cold regions. Moreover, a nutrient augmentation study showed that adding formate into media could promote PAH degradation, while the supplement of salicylate had an inhibitive effect. Furthermore, in a metabolic pathway study, salicylate, phthalic acid, and 9-fluorenone were detected during the degradation of fluorene or phenanthrene. In conclusion, Pseudomonas sp. JM2 is a high performance strain in the degradation of fluorene and phenanthrene under extreme pH and temperature conditions. It might be useful in the bioremediation of PAHs.

关键词： polycyclic aromatic hydrocarbons Pseudomonas sp. biodegradation formate salicylate

Rate-distortion weighted SPIHT algorithm for interferometer data processing

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Journal of Systems Engineering and Electronics 2011年第4期22卷 547-556页

作者： jing ma Jindong Fei Dong Chen Science and Technology on Space Systems Simulation Laboratory Beijing Simulation Center Beijing 100854 E R. China Institute of Telecommunication Satellite China Academy of Space Technology Beijing 100094 P. R. China

As one of the next generation imaging spectrometers, the interferential spectrometer （iS） possesses the advantages of high throughput, multi-channel and great resolution. The data of IS are produced in the spatial domain, but optical applications are in the Fourier domain. Traditional compression methods can only protect the visual quality of interferometer data in the spatial do- main but ignore the distortion in the Fourier domain. The relation between the distortion in the Fourier domain and the compression in the spatial domain is analyzed. By mathematical proof and val- idation with experiments, the relation between spatial and Fourier domains is discovered, and the significance in the Fourier domain is more important as optical path difference （OPD） increasing in the spatial domain. Based on this relation, a novel coding scheme is proposed, which can compress data in the spatial domain while reducing the distortion in the Fourier domain. In this scheme, the bit stream of the set partitioning in hierarchical trees （SPIHT） is truncated by adaptively lifting rate-distortion slopes according to the priorities of OPD based on rate-distortion optimization theory. Experimental results show that the proposed method can provide better protection of spectrum curves in the Fourier domain while maintaining a comparable visual quality in the spatial domain.

关键词： interferential spectrometer (IS) multi-spectrum compression set partitioning in hierarchical trees (SPIHT).

Stretch-shear mode laminated metglas/Pb(Zr,Ti)O3/metglas composite with an enhanced magnetoelectric effect

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Science Bulletin 2017年第6期62卷 388-390页

作者： Chengzhou Xin Jiannan ma jing ma Cewen Nan State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China

magnetoelectric(ME)composites have recently attracted an ever-increasing interest and provoked a great number of research activities,driven by the potential applications in novel multifunctional devices,such as sensors and transducers[1].Direct ME effect,which describe the appearance of an electric polarization P upon applying a magnetic field H,is usually evaluated by the

关键词： mode Zr,Ti)O3/metglas composite with an enhanced magnetoelectric effect PZT ME Ti

Deep learning for complex chemical systems

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National Science Review 2023年第12期10卷 8-10页

作者： Wei Li Guoqiang Wang jing ma Institute of Theoretical and Computational Chemistry Key Laboratory of Mesoscopic Chemistry of Ministry of Education School of Chemistry and Chemical Engineering Nanjing University

Modern experimental techniques and theoretical simulations extended the research scope of complex chemical processes in functional molecules/materials innovation. Quantum chemistry (QC)-level simulations of macromolecules and condensed-phase systems need machine learning (ML) or deep learning (DL)[1]to decrease computational costs, which traditionally increases exponentially with system size. To guide rational design and optimize synthetic processes,

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In-line Plasma-induced Graft-copolymerization of Pentaerythritol Triacrylate onto Polypropylene

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Chinese Journal of Polymer Science 2018年第8期36卷 979-983页

作者： Gui-Qiu ma Guan-Kai Sun Zhe ma jing-Qing Li jing Sheng Department of Polymer material Science and Engineering Institute of Advanced Polymer MaterialsSchool of Material Science and EngineeringTianjin Key Laboratory of Composite and Functional MaterialsTianjin University

Pentaerythritol triacrylate （PETA） was successfully grafted onto the plasma-treated isotactic polypropylene （iPP） via the in situ melt processing. The X-ray photoelectron spectroscopy （XPS） results showed that the hydroxyl and carbonyl groups, and peroxides could be generated via plasma treatment. The content of free radical in plasma-treated iPP （PiPP） was measured by 2,2-diphenyl-1- picrylhydrazyl （DPPH）. It was found that the resulting peroxides induced the grafting copolymerization of PETA onto iPP, and the grafted PETA promoted the formation of β-crystal in PiPP, which was evidenced by Fourier transform infrared spectroscopy （FTIR）, differential scanning calorimetry （DSC） and wide-angle X-ray diffraction （WAXD） measurements, respectively.

关键词： Plasma treatment Melt processing Graft copolymerization Pentaerythritol triacrylate

Development and validation of prognostic nomogram based on log odds of positive lymph nodes for patients with gastric signet ring cell carcinoma

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Chinese Journal of Cancer Research 2020年第6期32卷 778-793页

作者： Zijie Xu jing jing Guiliang ma Department of General Surgery Qingdao Municipal HospitalQingdao UniversityQingdao 266071China Department of Endocrinology Qingdao Municipal HospitalQingdao UniversityQingdao 266071China

Objective: Our aims were to establish novel nomogram models, which directly targeted patients with signet ring cell carcinoma(SRC), for individualized prediction of overall survival(OS) rate and cancer-specific survival(CSS).Methods: We selected 1,365 SRC patients diagnosed from 2010 to 2015 from Surveillance, Epidemiology and End Results(SEER) database, and then randomly partitioned them into a training cohort and a validation *** predicted indicators, which were identified by using univariate testing and multivariate analyses, were used to construct our prognostic nomogram models. Three methods, Harrell concordance index(C-index), receiver operating characteristics(ROC) curve and calibration curve, were used to assess the ability of discrimination and predictive accuracy. Integrated discrimination improvement(IDI), net reclassification improvement(NRI) and decision curve analysis(DCA) were used to assess clinical utility of our nomogram ***: Six independent predicted indicators, age, race, log odds of positive lymph nodes(LODDS), T stage, M stage and tumor size, were associated with OS rate. Nevertheless, only five independent predicted indicators were associated with CSS except race. The developed nomograms based on those independent predicted factors showed reliable discrimination. C-index of our nomogram for OS and CSS was 0.760 and 0.763, which were higher than American Joint Committee on Cancer(AJCC) 8 th edition tumor-node-metastasis(TNM) staging system(0.734 and 0.741, respectively). C-index of validation cohort for OS was 0.757 and for CSS was 0.773. The calibration curves also performed good consistency. IDI, NRI and DCA showed the nomograms for both OS and CSS had a comparable clinical utility than the TNM staging ***: The novel nomogram models based on LODDS provided satisfying predictive ability of SRC both in OS and CSS than AJCC 8 th edition TNM staging system alone.

关键词： Log odds of positive lymph nodes nomograms prognosis signet ring cell

Influence of shaped charge structure parameters on the formation of linear explosively formed projectiles

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Defence Technology（防务技术） 2022年第10期18卷 1863-1874页

作者： Tian-bao ma jing Liu Qi Wang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

The research of LEFP(linear explosive forming projectile)is of great value to the development of new warhead due to its excellent *** further improve the damage ability of the shaped charge warhead,a special shell overhanging structure was designed to increase the charge based on the traditional spherical charge,in which case the crushing energy of LEFP could be ***-DYNA was used to simulate different charge structures obtained by changing the number of detonation points,the length of shell platform,the radius of curvature and the thickness of *** RSM(response surface model)between the molding parameters of LEFP and the structural parameters of charge was *** on RSM model,the structure of shaped charge was optimized by using multi-objective genetic ***,the formation process of jet was analyzed by pulsed X-ray *** results show that the velocity,length-diameter ratio and specific kinetic energy of the LEFP were closely related to the structural parameters of the shaped *** the optimization of charge structure,the forming effect and penetration ability of LEPP had been significantly *** experimental data of jet velocity and length were consistent with the numerical results,which verifies the reliability of the numerical results.

关键词： LEFP Numerical simulation Shaped charge Structure optimization

Theoretical study of low-lying excited states of molecular aggregates. I. Development of linear-scaling TD-DFT

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Science China Chemistry 2013年第9期56卷 1263-1266页

作者： LIU WenJian ma jing Beijing National Laboratory for Molecular Sciences Institute of Theoretical and Computational ChemistryState Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular Engineeringand Center for Computational Science and EngineeringPeking University School of Chemistry and Chemical Engineering Institute of Theoretical and Computational ChemistryKey Laboratory of Mesoscopic Chemistry of MOENanjing University

The project aims to develop an integrated linear-scaling time-dependent density functional theory (TD-DFT) for studying low-lying excited states of luminescent molecular materials, especially those fluorescence and phosphorescence co-emitting systems. The central idea will be "from fragments to molecule" (FF2M). That is, the fragmental information will be employed to synthesize the molecular wave function, such that the locality (transferability) of the fragments (functional groups) is directly built into the algorithms. Both relativistic and spin-adapted open-shell TD-DFT will be considered. Use of the renormalized exciton method will also be made to further enhance the efficiency and accuracy of TD-DFT. Solvent effects are to be targeted with the fragment-based solvent model. It is expected that the integrated TD-DFT and program will be of great value in rational design of luminescent molecular materials.

关键词： linear-scaling TD-DFT from fragments to molecule spin-orbit coupling renormalized excitions fragment-based solvent model luminsescent molecular material

Muon g - 2 in the Littlest Higgs Model

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Communications in Theoretical Physics 2006年第5期45卷 894-900页

作者： Farshid Tabbakh LIU jing-jing ma Wen-Gan Department of Modern Physics University of Science and Technology of China （USTC） Hefei 230027 China

In this paper the anomalous magnetic dipole moment ofmuon in the littlest Higgs （LH） model is studied at one-loop level. We discuss the dependence of the contributions on the global symmetry breaking scale f, mizing angles c` and , and the Higgs triplet vacuum expectation value v＇ in the electroweak precision data preferring ranges. We find that the LH model can give a relatively small, but non-negligible extra weak contribution to the muon anomalous magnetic moment and can reduce the deviation of △aμ from 2.6σ for the SM to 2.5σ for the LH model.

关键词： Littlest Higgs model anomalous magnetic dipole moment of muon