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Degradation of pyrene by immobilized microorganisms in saline-alkaline soil

Journal of Environmental Sciences 2012年第9期24卷 1662-1669页

作者： Shanxian Wang Xiaojun Li Wan Liu peijun Li Lingxue Kong Wenjie ren Haiyan Wu Ying tu Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Centre for Material and Fiber Innovation Institute for Technology and Research Innovation Deakin University Geelong Vic 3217 Australia College of Resource and Environmental Engineering Liaoning Technical University Fuxin 123000 China

Biodegradation of polycyclic aromatic hydrocarbons （PAHs） is very difficult in saline-alkaline soil due to the inhibition of microbial growth under saline-alkaline stress. The microorganisms that can most effectively degrade PAHs were screened by introducing microorganisms immobilized on farm byproducts and assessing the validity of the immobilizing technique for PAHs degradation in pyrene-contaminated saline-alkaline soil. Among the microorganisms examined, it was found that Mycobacterium sp. B2 is the best, and can degrade 82.2% and 83.2% of pyrene for free and immobilized cells after 30 days of incubation. The immobilization technique could increase the degradation of pyrene significantly, especially for fungi. The degradation of pyrene by the immobilized microorganisms Mucor sp. F2, fungal consortium MF and co-cultures of MB＋MF was increased by 161.7% （P 〈 0.05）, 60.1% （P 〈 0.05） and 59.6% （P 〈 0.05） after 30 days, respectively, when compared with free F2, MF and MB＋ME Scanning electron micrographs of the immobilized microstructure proved the positive effects of the immobilized microbial technique on pyrene remediation in saline- alkaline soil, as the interspace of the carder material structure was relatively large, providing enough space for cell growth. Co-cultures of different bacterial and fungal species showed different abilities to degrade PAHs. The present study suggests that Mycobacterium sp. B2 can be employed for in situ bioremediation of PAHs in saline-alkaline soil, and immobilization of fungi on farm byproducts and nutrients as carriers will enhance fungus PAil-degradation ability in saline-alkaline soil.

关键词： saline-alkaline soil immobilization PAHs-degrading microorganisms biodegradation characteristics Mycobacterium

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tunable plasmon-induced transparency based on asymmetric H-shaped graphene metamaterials

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Chinese Physics B 2018年第12期27卷 297-303页

作者： Yu-Chen Tian Wei Jia pei-Wen ren Chun-Zhen Fan School of Physical Science and Engineering Zhengzhou University

We propose and numerically demonstrate a tunable plasmon-induced transparency(PIT) phenomenon based on asymmetric H-shaped graphene metamaterials. The tunable PIT effect is realized through varying the applied polarization angles rather than changing the structure geometry. By simply adjusting the polarization angle, the transmission spectra can be controlled between the switch-on state and switch-off state. The physical mechanism of the induced transparency is revealed from magnetic dipole inductive coupling and phase coupling. Importantly, by varying the Fermi energy of the graphene or the refractive index of the substrate, the resonant position of the PIT can be dynamically controlled and the maximum modulation depths can reach up to 60.7%. The sensitivity(nm/RIU) of the graphene structure, which is the shift of resonance wavelength per unit change of refractive index, is 5619.56 nm/RIU. Moreover, we also extend our research to the x-axis symmetric H-shaped structure, and the tunable PIT transmission window can also be realized. The physical mechanism of the induced transparency is revealed from the electric dipole hybridization coupling. Our designed H-shaped graphene-based structures is a promising candidate for compact elements such as tunable sensors, switches and slow-light devices.

关键词： plasmon-induced transparency graphene polarization optical filter

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Effects of Process Parameters of Semisolid Stirring on Microstructure of Mg–3Sn–1Mn–3SiC(wt%) Strip Processed by Rheo-rolling

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Acta Metallurgica Sinica(English Letters) 2017年第1期30卷 66-72页

作者： Zhan-Yong Zhao ren-Guo Guan Jian-Hong Zhang Zhou-Yang Zhao pei-Kang Bai School of Materials Science and Engineering North University of China School of Materials Science and Engineering Northeastern University

A novel semisolid stirring and rheo-rolling process for preparing Mg-3Sn-1Mn-3SiC （wt%） composite strips was proposed, and the effects of process parameters of semisolid stirring on microstructures of Mg-3Sn-1Mn-3SiC （wt%） composite strips were investigated. The average grain size and roundness decrease, and the distribution of SiC becomes more homogeneous with the decrease in stirring temperature and the increase in the stirring speed. When the stirring time is increased, the distribution of SiC particles tends to be homogeneous, and the average grain diameter and roundness of α- Mg grain decrease. Under the following process parameters： the stirring temperature at 640 ℃, the stirring speed at 1100 rpm, the stirring time at 30 min and the roll speed at 0.2 m/s, Mg-3Sn-1Mn-3SiC （wt%） strip with a cross-sectional size of 4 mm × 160 mm was prepared. The ultimate tensile strength and elongation of Mg-3Sn-1Mn-3SiC （wt%） composite strip reached 226 ± 6 MPa and （7.4 ± 0.2）%, which are obviously improved in comparison with Mg-3Sn-1Mn （wt%）.

关键词： Mg-matrix composite Rheo-rolling Microstructure Property

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Dynamically tunable optical properties in graphene-based plasmon-induced transparency metamaterials

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Chinese Physics B 2019年第2期28卷 363-368页

作者： Wei Jia pei-Wen ren Yu-Chen Tian Chun-Zhen Fan School of Physical Science and Engineering Zhengzhou University

A graphene-based metamaterial for THz plasmon induced transparency(PIT) is presented and numerically studied in this paper, which consists of two horizontal graphene strips attached to a continuous vertical wire separately. The calculated surface current distributions demonstrate that the distinct PIT window results from the near-field coupling of two bright modes. To explore the physical mechanism of PIT effect, we employ the coupled Lorentz oscillator model. The transmission spectra obtained with this model fits well with the simulation results. The performance of the PIT system can be controlled through the geometry parameters of graphene strips. Moreover, the transparency window can be dynamically tuned by varying the Fermi energy and the carrier mobility of the graphene strips. The slow light effect is also explored in our proposed structure and it can achieve 1.25 ps when Fermi energy is 1.3 eV. Finally, the position of the transmission window with the variation of the nearby medium refractive index is examined. Such a proposed graphene-based PIT system may have great potential applications in photonic devices.

关键词： plasmon-induced transparency graphene tunable

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Abnormal saturation magnetization dependency on W content for Co-W thin films

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Acta Metallurgica Sinica(English Letters) 2010年第1期23卷 8-12页

作者： Bo YANG Gaowu QIN Weili pei Yuping ren Na XIAO Xiang ZHAO Katsunari OIKAWA Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) Northeastern University Shenyang 110004 China Graduate School of Engineering Tohoku University Sendai 980-8579 Japan

A series of hexagonal close-packed （HCP） Co-W thin films were deposited by sputtering on surface oxidized silicon substrates at 300 ℃. A linear dependency of saturation magnetization （Ms） on W content was found up to about 9 at. pct W, and then it underwent an increased Ms vs. W content curve as compared to the initial linear dependency. The thermal magnetization technique was used to confirm that the ino creased Ms behaviour is correlated to the phase separation of the Co-W thin films. The phase separation behaviour was also found to be dependent on W content and the reason was discussed in detail. Finally an interesting composition range was suggested to be about 13 at. pct-17 at. pct W for the Co-W thin films, in which they exhibit much higher magnetic anisotropy energy than Co-Cr thin films and improved phase separation.

关键词： Magnetic recording media Phase separation Thin film Thermal magnetization

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Effect of electroacupuncture on E-prostanoid 2 expression in the spinal cord in rats with neuropathic pain

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Journal of Traditional Chinese Medicine 2017年第4期37卷 496-502页

作者： Ji Lili Jiang Huili ren Xiujun Guo Mengwei Ge Dongyu Li Genmao tu Ya School of Acupuncture-moxibustion and tuina Beijing University of Chinese Medicine Beijing 100029 China School of Basic Medicine Beijing University of Chinese Medicine Beijing 100029 China

OBJECTIVE: To observe the effect of electroacupuncture(EA) treatment on the expression of E-prostanoid 2(EP2) in the spinal cord using a rat model of neuropathic pain, and to examine the effect of different acupuncture ***: Rats were randomly divided into six groups: a normal group, model group, sham group,EA 1 group(distal-proximal acupoints), EA 2 group(proximal acupoints), and EA 3 group(distal acupoints). Rats in the EA groups were treated for20 min, once daily for 7 days. The mechanical withdrawal threshold was evaluated at 1 day preoperatively and at 3, 5, and 7 days postoperatively. At 7days postoperatively, hematoxylin-eosin(HE) staining was used to investigate spinal morphological changes. Spinal EP2 messenger ribonucleic acid(m RNA) was detected using reverse-transcription polymerase chain ***: After the EA treatment, the mechanical withdrawal threshold was up-regulated compared with the model group(P 0.05). The EA 1and EA 2 groups showed a larger treatment effect than the EA 3 group. The HE results showed that EA can improve spinal histomorphology induced by neuropathic ***: EA had a strong analgesic and anti-inflammatory effect. The therapeutic effect of EA on the down-regulation of spinal EP2 m RNA expression may be greater when either local acupoints or a distal-proximal combination of acupoints are used than when distal points are used.

关键词： Neuropathic pain Electroacupuncture Nucleus pulposus E-prostanoid 2 Spinal cord

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Ferroptosis inhibition attenuates inflammatory response in mice with acute hypertriglyceridemic pancreatitis

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World Journal of Gastroenterology 2023年第15期29卷 2294-2309页

作者： Yi-Teng Meng Yi Zhou pei-Yu Han Hong-Bo ren Department of Gastroenterology Shenzhen People’s Hospital(The Second Clinical Medical CollegeJinan UniversityThe First Affiliated HospitalSouthern University of Science and Technology)Shenzhen 518020Guangdong ProvinceChina Wuxi School of Medicine Jiangnan UniversityWuxi 214000Jiangsu ProvinceChina Department of Gastroenterology Qilu HospitalJinan 250012Shandong ProvinceChina

BACKGROUND Ferroptosis is involved in developing inflammatory diseases;yet,its role in acute hypertriglyceridemic pancreatitis(HTGP)remains *** To explore whether ferroptosis is involved in the process of HTGP and elucidate its potential *** An HTGP mouse model was induced using intraperitoneal injection of P-407 and caerulein(CAE).Then,pancreatic tissues from the model animals were subjected to proteome sequencing *** pathological changes and scores of the pancreas,lung,and kidney were determined using hematoxylin-eosin *** levels of serum amylase(AMY),triglyceride,and total cholesterol were measured with an automatic blood cell ***,the serum levels of tumor necrosis factor(TNF)-α,interleukin(IL)-6,and IL-1βwere determined by enzyme linked immunosorbent ***(MDA),glutathione(GSH),and Fe^(2+)were detected in the ***,immunohistochemistry was performed to assess the expression of ferroptosis-related *** Proteome sequencing revealed that ferroptosis was involved in the process of HTGP and that NADPH oxidase(NOX)2 may participate in ferroptosis ***,the levels of serum AMY,TNF-α,IL-6,and IL-1βwere significantly increased,MDA and Fe^(2+)were upregulated,GSH and ferroptosis-related proteins were reduced,and the injury of the pancreas,lung,and kidney were aggravated in the P407+CAE group compared to CAE and wild type groups(all P<0.05).Notably,the inhibition of ferroptosis and NOX2 attenuated the pathological damage and the release of TNF-α,IL-6,and IL-1βin the serum of the *** Ferroptosis was found to have an important role in HTGP and may be considered a potential target for clinical treatment.

关键词： Ferroptosis Acute hypertriglyceridemic pancreatitis NADPH oxidase 2 Ferrostatin-1 Vas2870

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A new type electrohydraulic servo valve based on magnetic shape memory alloy

A new type electrohydraulic servo valve based on magnetic sh...

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第八届中国功能材料及其应用学术会议

作者： tu Fu-quan MAO Yang XU ren-bo Key Laboratory of Metallurgical Equipment and Control Technology Ministry of EducationCollege of Machinery and AutomationWuhanUniversity of Science and Technology

ISBN: (纸本)9783037859698

In this paper,the magnetically controlled characteristic and shape variation mechanism magnetic shape memory alloys(MSMA) sample are studied through the servo valve actuatorbased on *** MSMA is a new type of functional materials,which has huge drivingforce and large controllability *** kind of actuator is designed by differential modeof MSMA,employing bias coils to generate biasing magnetic field and applying field coils to provide magnetic field which is *** between displacement of the new actuator and time is got by numerical simulation using Maxwell ***,motivated by the simulation results,the rationality of structural design of the new type of actuator is validated.

关键词： MSMA actuator Field coils Bias magnetic field Maxwell simulation

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Study on rain-runoff process in the peripheral mountainous area of the Sichuan Basin

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Chinese Journal Of Geochemistry 2008年第2期27卷 183-188页

作者： FU Bin WANG Yu-kuan ren Yi LIU Cheng XU pei Key Laboratory of Mountain Surface Process and Hazards Chinese Academy of Sciences Chengdu 610041 China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Studies on rain-runoff process in the peripheral mountainous area of the Sichuan Basin, which is regarded as a key ecological shelter, will contribute to flood control and environmental protection for the Upper Yang-tze River Basin. In two typical catchments-the Fujiang River Catchment and the Wujiang River Catchment, rainfall simulations have been conducted to study the rain-runoff processes of yellow soil and limestone soil in three types of land use-forestland, farmland and grassland. Results showed that (1) within the same rainfall process, overland flow occurs first on farmland, then on grassland, and finally on forestland; (2) soil surface coverage has a great impact on the occurrence and amount of overland flow. The runoff amount can increase 2-4 times after the coverage is removed;(3) the infiltration before the occurrence of overland flow will decrease because of higher gravel contents of soil, but it takes no effect on infiltration once overland flow becomes stable; (4) the runoff coefficient of the limestone soil forestland is greater than that of the yellow soil forest land, but less than that of the farmland; (5) three empirical infiltration models, including Horton' model, Kostiakov' model, and modified Kostiakov' model, were compared by using the observed results under rainfall simulation. The results showed that the Kostiakov' model performed better than both the Horton' model and modified Kostiakov model. According to the results of this research, the Kostiakov's model can be used to simulate rainfall infiltration when water erosion is modeled in the peripheral mountainous area of the Sichuan Basin.

关键词：山地四川盆地降雨量河流

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Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers

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Acta Metallurgica Sinica(English Letters) 2019年第9期32卷 1142-1150页

作者： Xin-Yu ren Hai-Shui ren Yong-Wang Kang Hua-Ping Xiong Chong pei Bo Chen Yao-Yong Cheng A.I.Ustinov Welding and Plastic Forming Division Beijing Institute of Aeronautical MaterialsBeijing 100095China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical MaterialsBeijing 100095China E.O.Paton Electric Welding Institute of NAS of Ukraine Kiev 03680Ukraine

Diffusion bonding of refractory Nb–Si-based alloy was performed with Ni/Al and Ti/Al nanolayers under the condition of 1473 K/30 MPa/60 *** NbSS/Nb5Si3 in situ composite with the nominal composition of Nb–22 Ti–16 Si–3 Cr–3 Al–2 Hf was used as the parent *** joint microstructures were examined by using a scanning electron microscope equipped with an X-ray energy dispersive *** test was conducted for the bonded joints at room *** the joint bonded with Ni/Al multilayer,element diffusion occurred between the base metal and the nanolayer,with the reaction products of AlNb2+Ni3 Al,NiAl and AlNi2 Ti *** average shear strength was 182 *** using Ti/Al multilayer,the interface mainly consisted of TiAl,(Ti,Nb)Al and(Ti,Nb)2 Al phases,and the corresponding joints exhibited an increased strength of 228 *** this case,the fracture mainly took place in the TiAl phase and presented a typical brittle characteristic.

关键词： Nbss/Nb5Si3 composite Diffusion bonding Nanolayer Shear strength

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