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Journal of Environmental Sciences 2009年第6期21卷 842-848页

作者： xiao Jing RUI Qi GUO Yuling chang Xingya WANG Dayong College of Life Sciences Nanjing Normal University Nanjing 210046 China Department of Genetics and Developmental Biology Southeast University Nanjing 210009 China Key Laboratory of Developmental Genes and Human Disease in Ministry of Education Nanjing 210009 China

We examined the possible multiple defects induced by acute and prolonged exposure to high levels of manganese（Mn） solution by monitoring the endpoints of lifespan,development,reproduction,and stress *** data suggest that acute exposure（6 h） to Mn did not cause severe defects of life span,development,and reproduction,similarly,no significant defect could be found in animals exposed to a low concentration of Mn（2.5 μmol/L） for 48 *** contrast,prolonged exposure（48 h） to high Mn concentrations（75 and 200 μmol/L） resulted in significant defects of life span,development,and reproduction,as well as the increase of the percentage of population with hsp-16.2：：gfp expression indicating the obvious induction of stress responses in exposed ***,prolonged exposure（48 h） to high concentrations（75 and 200 μmol/L） of Mn decreased the expression levels of antioxidant genes of sod-1,sod-2,sod-3,and sod-4 compared to ***,prolonged exposure to high concentrations of Mn will induce the severe defects of life span,development,and reproduction in nematodes possibly by affecting the stress response and expression of antioxidant genes in Caenorhabditis elegans.

关键词： manganese toxicity prolonged exposure stress response antioxidant gene Caenorhabditis elegans

Model Algorithm Research on Cooling Path Control of Hot-rolled Dual-phase Steel

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Journal of Iron and Steel Research International 2016年第10期23卷 1028-1034页

作者： xiao-qing XU xiao-dong HAO Shi-guang ZHOU chang-sheng LIU Qi-fu ZHANG School of Material Science and Engineering Northeastern University New Metallurgy Hi-tech Group Co. Ltd.

With the development of advanced high strength steel,especially for dual-phase steel,the model algorithm for cooling control after hot rolling has to achieve the targeted coiling temperature control at the location of downcoiler whilst maintaining the cooling path control based on strip microstructure along the whole cooling section.A cooling path control algorithm was proposed for the laminar cooling process as a solution to practical difficulties associated with the realization of the thermal cycle during cooling *** heat conduction equation coupled with the carbon diffusion equation with moving boundary was employed in order to simulate temperature change and phase transformation kinetics,making it possible to observe the temperature field and the phase fraction of the strip in real *** this basis,an optimization method was utilized for valve settings to ensure the minimum deviations between the predicted and actual cooling path of the strip,taking into account the constraints of the cooling equipment′s specific capacity,cooling line length,*** showed that the model algorithm was able to achieve the online cooling path control for dual-phase steel.

关键词： dual-phase steel laminar cooling phase transformation integrated process model cooling path control

Effect of magnetic field on elements segregation in electroslag ingot

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Journal of Iron and Steel Research International 2022年第3期29卷 434-444页

作者： Gang Gao Chun-li Zhu xiao-fang Shi Li-zhong chang School of Metallurgy Engineering Anhui University of TechnologyMa’anshan243002AnhuiChina SINO STEEL Ma’anshan Institute of Mining Research Co. Ltd.Ma’anshan243000AnhuiChina

In order to improve the production efficiency of electroslag remelting process and the solidification quality of electroslag ingot,a novel electroslag furnace with electromagnetic stirring was designed and the effects of external magnetic field and different electrical parameters on electroslag remelting process were *** distribution of carbon,chromium,phosphorus and compactness in electroslag ingot was analyzed through original position analysis *** show that the external magnetic field accelerates the remelting of consumable *** the condition of remelting voltage of 34 V and current of 1500 A,the remelting rate of metal consumable electrode increases from 20 to 27 mm min−1 when the magnetic induction intensity of 62×10^(−4) and 108×10^(−4) T is ***,the remelting current decreases from 1500 to 1100 A under the condition of constant remelting rate and remelting voltage,thereby reducing the energy *** effect of external magnetic field on the segregation of different elements in electroslag ingot is *** the experimental conditions,the carbon segregation is unremarkable,but the phosphorus segregation is improved when the electromagnetic force generated by the interaction between the external magnetic field and the remelting current is ***,the excessive electromagnetic force aggravates the segregation of carbon and *** the increase in electromagnetic force,the chromium segregation gradually increases.

关键词： Electroslag remelting Magnetic field Solidification Segregation Remelting rate

Non-artifact vector P- and S-wave separation for elastic reverse time migration

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Petroleum Science 2022年第6期19卷 2695-2710页

作者： Xi-Yan Zhou Xu chang Yi-Bo Wang xiao-Tao Wen Jia-Chun You chang Sun Key Laboratory of Earth Exploration and Information Techniques Chengdu University of TechnologyChengdu610059SichuanChina College of Geophysics Chengdu University of TechnologyChengdu610059SichuanChina Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Key Laboratory of Petroleum Resource Research Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China

Elastic reverse time migration(RTM)uses the elastic wave equation to extrapolate multicomponent seismic data to the subsurface and separate the elastic wavefield into P-and S-waves.P-and S-wave separation is a necessary step in elastic RTM to avoid crosstalk between coupled ***,the current curl-divergence operator-based separation method has a polarity reversal problem in PS imaging,and vector separation methods often have separation artifacts at the interface,which affects the quality of the imaging *** propose a non-artifact P-and S-wave separation method based on the first-order velocity-strain *** equation is used for wavefield extrapolation and separation in the first-order staggered-grid finite-difference scheme,and the storage and calculation amounts are consistent with the classical first-order velocity-stress *** separation equation does not calculate the partial derivatives of the elastic parameters,and thus,there is no artifact in the separated Pand *** wavefield extrapolation,the dynamic characteristics of the reflected wave undergo some changes,but the transmitted wavefield is accurate;therefore,it does not affect the dynamic characteristics of the final migration *** numerical examples of 2 D simple models,part SEAM model,BP model,and 3 D 4-layer model,different wavefield separation methods and corresponding elastic RTM imaging results are *** found that the velocity-strain based elastic RTM can image subsurface structures well,without spike artifacts caused by separation artifacts,and without polarity reversal phenomenon of the PS imaging.

关键词： Multicomponent Elastic RTM P-and S-Wave separation Separation artifacts Decoupled velocity-strain equations

Nitric Oxide Blocks Blue Light-Induced K^+ Influx by Elevating the Cytosolic Ca^(2+) Concentration in Vicia faba L. Guard Cells

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Journal of Integrative Plant Biology 2013年第6期55卷 527-536页

作者： Xiang Zhao Yuan-Yuan Li Hui-Li xiao chang-Shui Xu xiao Zhang Institute of Plant Stress Biology State Key Laboratory of Cotton Biology College of Life Sciences Henan University

Ca2＋ plays a pivotal role in nitric oxide （NO）-promoted stomatal closure. However, the function of Ca2＋ in NO inhibition of blue light （BL）-induced stomatal opening remains largely unknown. Here, we analyzed the role of Ca2＋ in the crosstalk between BL and NO signaling in Vicia faba L. guard cells. Extracellular Ca2＋ modulated the BL-induced stomatal opening in a dose-dependent manner, and an application of 5 μM Ca2＋ in the pipette solution significantly inhibited BL-activated K＋ influx. Sodium nitroprusside （SNP）, a NO donor, showed little effect on BL-induced K＋ influx and stomatal opening response in the absence of extracellular Ca2＋ , but K＋ influx and stomatal opening were inhibited by SNP when Ca2＋ was added to the bath solution. Interestingly, although both SNP and BL could activate the plasma membrane Ca2＋ channels and induce the rise of cytosolic Ca2＋ , the change in levels of Ca2＋ channel activity and cytosolic Ca2＋ concentration were different between SNP and BL treatments. SNP at 100 μM obviously activated the plasma membrane Ca2＋ channels and induced cytosolic Ca2＋ rise by 102.4%. In contrast, a BL pulse （100 μmol/m 2 per s for 30 s） slightly activated the Ca2＋ channels and resulted in a Ca2＋ rise of only 20.8%. Consistently, cytosolic Ca2＋ promoted K＋ influx at 0.5 μM or below, and significantly inhibited K＋ influx at 5 μM or above. Taken together, our findings indicate that Ca2＋ plays dual and distinctive roles in the crosstalk between BL and NO signaling in guard cells, mediating both the BL-induced K＋ influx as an activator at a lower concentration and the NO-blocked K＋ influx as an inhibitor at a higher concentration.

关键词： Blue light cytosolic Ca2+ nitric oxide stomatal movement.

Al-doped ZnO/WO_(3) heterostructure films prepared by magnetron sputtering for isopropanol sensors

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Rare Metals 2024年第1期43卷 247-256页

作者： Wei-Xiang Gao Xue-Ting chang xiao-Jie Zhu Jun-Feng Li Ying-chang Jiang Dong-Sheng Wang Chuan-xiao Yang Shi-Bin Sun College of Logistics Engineering Shanghai Maritime UniversityShanghai 201306China College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China Institute of Logistics Science and Engineering Shanghai Maritime UniversityShanghai 201306China

Metal oxide semiconductors(MOSs) are ideal sensing materials for detecting volatile organic compounds due to their low cost, diversity, high stability, and ease of production. However, it remains a grand challenge to develop the MOSs-based gas sensors for sensing isopropanol with desired performance via a simple, effective,and controllable method. Herein, we reported the preparation of the Al-doped Zn O(AZO)/WO_(3) heterostructure films by directly depositing the AZO coating onto the WO_(3) coating using a strategy of magnetron sputtering. The AZO/WO_(3) heterostructure films were constructed by numbers of irregular nanoparticles that were interconnected with each other. The AZO/WO_(3) heterostructure films-based gas sensors exhibited excellent isopropanolsensing performance with high response, promising selectivity, low detection limit, fast response rate, wide detection range, and ideal reproducibility. The promising isopropanol-sensing performance of the AZO/WO_(3) heterostructure films arises mainly from their high uniformity, unique microstructures with high surface roughness,and the construction of the heterostructure between the AZO and WO_(3) coatings. This work provides a versatile approach to prepare the MOSs-based heterostructure films for assembling the gas sensors.

关键词： Metal oxide semiconductors Gas sensors Aldoped ZnO/WO_(3) Heterostructure films Isopropanol Magnetron sputtering

Eco-friendly calcium alginate microspheres enable enhanced profile control and oil displacement

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Petroleum Science 2024年第3期21卷 1928-1943页

作者： xiao-Han Zhang chang-Jing Zhou Yuan-Xiang xiao Bo Hui Yong-Gang Xie Yu-Bin Su Xin-Ru Li Jie Huang Mao-chang Liu International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an710049ShaanxiPR.China Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil&Gas Reservoirs School of Petroleum EngineeringXi'an Shiyou UniversityXi'an 710065ShaanxiPR.China Oil&Gas Technology Research Institute Changqing Oilfield Branch CompanyPetroChinaXi'an710021ShaanxiPR China Suzhou Academy of Xi'an Jiaotong University Suzhou215123JiangsuPR China

Polymer microspheres(PMs),such as polyacrylamide,have been widely applied for enhanced oil recovery(EOR),yet with environmental ***,we report a microfluid displacement technology containing a bio-based eco-friendly material,i.e.,calcium alginate(CaAlg)microspheres for *** dominant mechanisms responsible for EOR over Ca Alg fluid have been verified,including the microscopic oil displacement efficacy augmented by regulating capillary force(determined by the joint action of interfacial tension and wettability between different phases)and macroscopic sweep volume increment through profile control and mobility ratio *** comprehensive effectiveness can be further impacted when the CaAlg microsphere is embellished ulteriorly by using appropriate amount of sodium dodecyl sulfonate(SDS).The core flooding and nuclear magnetic resonance(NMR)tests demonstrate that CaAlg-SDS microsphere can balance the interphase property regulation(wettability alteration and IFT reduction)and rheology properties,enabling simultaneous profile control and oil *** introduction of SDS will have a negative impact on rheological properties,which is not favored for *** results show that the involvement of 4-m M SDS will provide the best behavior,with an EOR rate of 34.38%.This cost-effective and environmentally-friendly bio-microspherebased microfluidic displacement technology is expected to achieve“green”oil recovery in future oilfield exploitation.

关键词： Calcium alginate microspheres Wettability Interfacial tension Rheology Viscoelasticity Enhanced oil recovery(EOR)

BUCKLING AND POST-BUCKLING OF ANNULAR PLATES UNDER NON-AXISYMMETRIC PLANE EDGE FORCES

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Applied Mathematics and Mechanics(English Edition) 1991年第5期12卷 469-480页

作者： Cheng chang-jun Yang xiao Department of Mechanics Lanzhou UniversityLanzhou

On the basis of both the general theory[1,2]and the finite element method[4]of perforated thin plates with large deflection,the buckling and post-buckling of annular plates under non-axisymmetric plane edge forces are... 详细信息

关键词： non-axisymmetric edge forces variational principle finite element method post-buckling behaviour

Rop plays conserved roles in the reproductive and digestive processes of spider mites

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Insect Science 2023年第2期30卷 351-364页

作者： Xue Xia chang-Wu Peng Qing-Tong Ye xiao-Li Bing xiao-Yue Hong Department of Entomology Nanjing Agricultural UniversityNanjingChina

Ras opposite(Rop)is known to play an essential role in regulating vesicle trafficking,including synaptic transmission and general *** fundamental roles of Rop have been confirmed by the observation that null mutations in many organisms generate lethal phenotypes during ***,the effects of Rop during the postembryonic stages,especially in non-model organisms,remain largely ***,we provide new data that enhance our understanding of Rop's roles in the adults of multiple species of Tetranychus spider mites(Acari:Tetranychidae),a class of notorious agricultural *** in silico and experimental evidence demonstrated that Rop is under purifying selection and is highly conserved in Tetranychus *** interference experiments showed that Rop is required for maintaining normal fecundity but has no significant effect on *** further demonstrate that knockdown of Rop darkens the body color of spider mites and blocks the excretion of fecal pellets,which is likely to be related to an abnormality in the excretion of food waste in the digestive ***,our findings clarify novel functions of a vesicle trafficking-related gene in the adult stage of multiple Tetranychus species and highlight the need to evaluate the roles of essential genes in various organisms.

关键词： body color reproduction Rop spider mites Tetranychus vesicle trafficking

Two-Quark Condensate changes with Quark Current Mass

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Communications in Theoretical Physics 2009年第9期52卷 483-486页

作者： LU chang-Fang LU xiao-Fu WU xiao-Hua ZHAN Yong-Xin Department of Physics Sichuan University Chengdu 610064 China Department of Physics Sichuan Agricultural University Ya＇an 625014 China Institute of Theoretical Physics The Chinese Academy of Sciences Beijing 100080 China CCAST （World Laboratory） P.O. Box 8730 Beijing 100080 China

Using the Schwinger Dyson equation and perturbation theory,we calculate the two-quark condensates forthe light quarks u,d,strange quark s and a heavy quark c with their current masses *** results show thatthe two-quark condensate will decrease when the quark mass increases,which hints the chiral symmetry may be restoredfor the heavy quarks.

关键词： quark current mass quark condensates QCD sum rule Schwinger-Dyson equation perturbation theory