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One-dimensional Viscous Diffusion Equation of Higher Order with Gradient Dependent Potentials and Sources

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Acta Mathematica Sinica,English Series 2018年第6期34卷 959-974页

作者： Yang CAO Jing Xue YIN ying hua li School of Mathematical Sciences Dalian University of Technology Dalian 116024 P. R. China School of Mathematical Sciences South China Normal University Guangzhou 510631 P. R. China

In this paper we consider the initial boundary value problem of a higher order viscous diffusion equation with gradient dependent potentials Φ（s） and sources A（s）. We first show the general existence and uniqueness of global classical solutions provided that the first order derivatives of both Φ（s） and A（s） are bounded below. Such a restriction is almost necessary, namely, if one of the derivatives is unbounded from below, then the solution might blow up in a finite time. A more interesting phenomenon is also revealed for potentials or sources being unbounded from below. In fact, if either the source or the potential is dominant, then the solution will blow up definitely in a finite time. Moreover, the viscous coefficient might postpone the blow-up time. Exactly speaking, for any T 〉 0, the solution will never blow up during the period 0 〈 t 〈 T, so long as thc viscous coefficient is large enough.

关键词： Cahn-Hilliard pseudo-parabolic asymptotic behavior

Empirical likelihood for Quantiles Under Associated Samples

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Acta Mathematicae Applicatae Sinica 2015年第1期31卷 71-80页

作者： ying-hua li Yong-song QIN Qing-zhu LEI School of Mathematics and Statistics Guangxi Normal University

The construction of confidence intervals for quantiles of a population under a associated sample is studied by using the blockwise technique. It is shown that the blockwise empirical likelihood （EL） ratio statistic is asymptotically X2-type distributed, which is used to obtain EL-based confidence intervals for quantiles of a population.

关键词： quantile associated sample blockwise empirical likelihood confidence interval

Sensitivity of key factors and uncertainties in health risk assessment of benzene pollutant

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Journal of Environmental Sciences 2007年第10期19卷 1272-1280页

作者： liU Zhi-quan ZHANG ying-hua li Guang-he ZHANG Xu Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

Predicting long-term potential human health risks from contaminants in the multimedia environment requires the use of models. However, there is uncertainty associated with these predictions of many parameters which can be represented by ranges or probability distributions rather than single value. Based on a case study with information from an actual site contaminated with benzene, this study describes the application of MMSOILS model to predict health risk and distributions of those predictions generated using Monte Carlo techniques. A sensitivity analysis was performed to evaluate which of the random variables are most important in producing the predicted distributions of health risks. The sensitivity analysis shows that the predicted distributions can be accurately reproduced using a small subset of the random variables. The practical implication of this analysis is the ability to distinguish between important versus unimportant random variables in terms of their sensitivity to selected endpoints. This directly translates into a reduction in data collection and modeling effort. It was demonstrated that how correlation coefficient could be used to evaluate contributions to overall uncertainty from each parameter. The integrated uncertainty analysis shows that although drinking groundwater risk is similar with inhalation air risk, uncertainties of total risk come dominantly from drinking groundwater route. Most percent of the variance of total risk comes from four random variables.

关键词： Monte Carlo sensitivity uncertainty MMSOILS models risk assessment

Effect of copper on edge cracking behavior and microstructure of rolled austenitic stainless steel plate

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Journal of Iron and Steel Research International 2022年第2期29卷 281-294页

作者： Guang-hui Zhao Jian Zhang Juan li hua-ying li Hai-tao liu li-feng Ma School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology Taiyuan030024ShanxiChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina

Cu is known to affect the edge cracking characteristics of austenitic stainless steel as it causes *** hot rolling test of four kinds of austenitic stainless steel with different copper content(0,2.42,3.60 and 4.35 wt.%)was carried out to examine the effect of hot rolling cracks on steel containing different copper *** evolution of crack and microstructure was analyzed using the scanning electron microscope,energy-dispersive spectrometer,electron back scattered diffraction and transmission electron *** results showed an upward trend in edge cracking degree when Cu content was 4.35%,and the crack extended from the edge of the steel plate to the middle by about 14 ***,severe oxidation was observed inside the crack by *** the increase in copper content at 1250℃,the content of{110}brass and{112}copper textures *** the content of copper was 4.35%,the decrease was most significant,and{112}copper texture content decreased to only 0.5%.Generally,the textures of 2.42%Cu and 3.60%Cu 304L steel changed little,while a large change in the texture of 4.35%Cu 304L steel was *** conclude,the increase in rolling temperature can prevent edge crack and its propagation effectively.

关键词： Austenitic stainless steel Copper Edge crack Microstructure Ferrite

Preparation of Monoclonal Antibody Against HPT and Its Application to Detecting Marker Protein in Genetically Modified Rice

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Biomedical and Environmental Sciences 2005年第5期18卷 321-325页

作者： li-CHEN YANG SU-XIANG ZHANG GUO-hua PI ying-hua li ZHEN ZHU XIAO-GUANG YANG National Institute of Nutrition and Food Safety National Institute of Viral Diseases Chinese Center for Disease Control and Prevention Beijing 100050 China Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China

To produce the monoclonal antibodies （mAbs） against hygromycin B phosphotransferase （HPT） and to develop immunoassay based on mAbs for biosafety assessment of HPT in genetically modified rice （GM rice）. Methods BALB/c mice were immunized with purified recombinant 6His. HPT protein, and the conventional hybridoma technology was used to generate the monoclonal hybridoma cells. EliSA and Western blot were used to analyze the specificity of mAbs recognizing HPT and the cross reaction with other proteins. A double-Ab sandwich EliSA method was established to detect HPT expression level in the sck gene-modified rice plants. Results Four hybridomas, named F1,D4-2, D4-4, and D4-5, producing the mAbs against HPT were successfully obtained with the titer of ascetic mAbs ranging from 10×10^-4 to10×10^-5. Identification of subclass showed that all the produced mAbs belonged to IgG1. Western blot showed specific binding reaction between the mAbs to the HPT proteins expressed in the GM rice. A double sandwich EliSA coated with anti-HPT polyclonal antibody was established with mAbs as sandwich antibody, which showed a sensitivity of 30ng/mL and did not crossreact with other proteins. The expression level of HPT in the leaves of sck-transformed lines was detected （80-150ng/mL）. But HPT protein in the grain and seed of GM rice could not be detected using this EliSA assay, Conclusion Anti-HPT mAbs prepared herein have a high specificity and can be used for rapid assay of HPT antigen. The expression level of HPT in the GM rice grain and seed is lower than our EliSA detection limit.

关键词： HPT Monoclonal antibody Preparation Application

Application of subsurface wastewater infiltration system to on-site treatment of domestic sewage under high hydraulic loading rate

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Water Science and Engineering 2015年第1期8卷 49-54页

作者： ying-hua li Hai-bo li Xin-yang Xu Xuan Gong Yong-chun Zhou School of Resources and Civil Engineering Northeastern University

In order to enhance the hydraulic loading rate （HLR） of a subsurface wastewater infiltration system （SWIS） used in treating domestic sewage, the intermittent operation mode was employed in the SWIS. The results show that the intermittent operation mode contributes to the improvement of the HLR and the pollutant removal rate. When the wetting-drying ratio （RwD） was 1.0, the pollutant removal rate increased by （13.6 ± 0.3）% for NH3-N, （20.7 ± 1.1）% for TN, （18.6± 0.4）% for TP, （12.2 ± 0.5）% for BOD, （10.1 ± 0.3）% for COD, and （36.2 ± 1.2）% for SS, compared with pollutant removal rates under the continuous operation mode. The pollutant removal rate declined with the increase of the HLR. The effluent quality met The Reuse of Urban Recycling Water - Water Quality Standard for Scenic Environment Use （GB/T 18921-2002） even when the HLR was as high as 10 cm/d. Hydraulic conductivity, oxidation reduction potential （ORP）, the quantity of nitrifying bacteria, and the pollutant removal rate of NH3-N increased with the decrease of the RWD. For the pollutant removal rates of TP, BOD, and COD, there were no significant difference （p 〈 0.05） under different RwDS. The suggested RWD was 1.0. Relative contribution of the pretreatment and SWlS to the pollutant removal was examined, and more than 80% removal of NH3-N, TN, TP, COD, and BOD occurred in the SWIS.

关键词： Domestic sewage Subsurface wastewater infiltration system Intermittent operation mode Hydraulic loading rate Pollutant removal rate

Nitrate Effect on Rice Growth and Nitrogen Absorption and Assimilation at Different Growth Stages

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Pedosphere 2006年第6期16卷 707-717页

作者： DUAN ying-hua ZHANG Ya-li SHEN Qi-Rong WANG Song-Wei College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing 210095 China

The effect of nitrate （NO3^-） on rice （Oryza sativa L.） growth as well as N absorption and assimilation during different growth stages was examined using three typical rice cultivars. Dry weight, yield, N uptake, nitrate reductase activity （NRA） in leaves, and glutamine synthetase activity （GSA） in roots and leaves during their entire growth periods, as well as the kinetic parameters of ammonium （NH4^＋） uptake at the seedling stage, were measured with solution culture experiments. Results indicated that addition of NH4^＋-N and NO3^-N at a ratio of 75：25 （NH4^＋＋NO3^- treatment） when compared with that of NH4^＋-N alone （NH4^＋ treatment） increased the dry weight of ‘Nanguang＇ cultivar by 30% and ‘Yunjing 38＇ cultivar by 31%, and also increased their grain yield by 21% and 17%, respectively. For the four growth stages, the total N accumulation in plants increased by an average of 36% for ‘Nanguang＇ and 31% for ‘Yunjing 38＇, whereas the increasing effect of NO3^- in the ‘4007＇ cultivar was only found at the seedling stage, in the NH4^＋＋NO3^- treatment compared to the NH4^＋ treatment, NRA in the leaves increased by 2.09 folds, and GSA increased by 92% in the roots and 52% in the leaves of the three cultivars. NO3^- supply increased the maximum uptake rate （Vmax） in the ‘Nanguang＇ and ‘Yunjing 38＇ cultivars, reflecting that the NO3^- itself, not the increasing N concentration, increased the uptake rate of NH4^＋ by rice. There was no effect on the apparent Michaelis-Menten constant （Kin） of the three cultivars. Thus, some replacement of NH4^＋ with NO3^-could greatly improve the growth of rice plants, mainly on account of the increased uptake of NH4^＋ promoted by NO3^-, and future studies should focus on the molecular mechanism of the increased uptake of NH4^＋ by NO3^-.

关键词： growth stages N absorption and assimilation nitrate N uptake rice

Lattice Boltzmann model for combustion and detonation

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Frontiers of physics 2013年第1期8卷 94-110页

作者： Bo Yan Ai-Guo Xu Guang-Cai Zhang Yang-Jun ying hua li National Key Laboratory of Computational Physics Institute of Applied Physics and Co~putational Mathe'maties P. O. Box 8009-26 Beijing 100088 China

In this paper we present a lattice Boltzmann model for combustion and detonation. In this model the fluid behavior is described by a finite-difference lattice Boltzmann model by Gan et al. [Physica A, 2008, 387: 1721]. The chemical reaction is described by the Lee-Tarver model [Phys. Fluids, 1980, 23: 2362]. The reaction heat is naturally coupled with the flow behavior. Due to the separation of time scales in the chemical and thermodynamic processes, a key technique for a successful simulation is to use the operator-splitting scheme. The new model is verified and validated by well-known benchmark tests. As a specific application of the new model, we studied the simple steady detonation phenomenon. To show the merit of LB model over the traditional ones, we focus on the reaction zone to study the non-equilibrium effects. It is interesting to find that, at the von Neumann peak, the system is nearly in its thermodynamic equilibrium. At the two sides of the von Neumann peak, the system deviates from its equilibrium in opposite directions. In the front of von Neumann peak, due to the strong compression from the reaction product behind the von Neumann peak, the system experiences a sudden deviation from thermodynamic equilibrium. Behind the von Neumann peak, the release of chemical energy results in thermal expansion of the matter within the reaction zone, which drives the system to deviate the thermodynamic equilibrium in the opposite direction. From the deviation from thermodynamic equilibrium, Δ m *, defined in this paper, one can understand more on the macroscopic effects of the system due to the deviation from its thermodynamic equilibrium.

关键词： lattice Boltzmann method Lee-Tarver model viscous detonation deviation from equilibrium

Fate of nitrogen in subsurface infiltration system for treating secondary effluent

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Water Science and Engineering 2017年第3期10卷 217-224页

作者： ying-hua li Hai-bo li Xin-yang Xu Si-yao Xiao Si-qi Wang Shu-cong Xu School of Resources and Civil Engineering Northeastern University School of Material Science and Engineering Shandong University

The concentration of total nitrogen(TN) is reported to vary between 20 and 35 mg/L in domestic wastewater. In raw wastewater, ammonia nitrogen eNHt4-NT is the main nitrogen form, accounting for 70%e82% of the TN concentration. Organic nitrogen, nitrite nitrogen eNOà2-NT,and nitrate nitrogen eNOà3-NT are present as well. For years, due to the lack of regulatory limits on nitrogen concentration in surface waters,nitrogen from secondary effluent has posed a significant threat to the health of aquatic ecosystems. Researchers have made substantial efforts to reduce the nitrogen concentration in secondary effluent. As a kind of advanced wastewater treatment technology, the subsurface infiltration(SI)system has been widely used, owing to its advantages, which include low operation cost, easy maintenance, and low energy consumption. This review discusses the fate of various forms of nitrogen in SI treatment, including organic nitrogen, NHt4-N, NOà2-N, and NOà3-N. Major biological processes involved in nitrogen removal and the main factors influencing its transformation are suggested. Finally, it is shown that ammonification followed by nitrification-denitrification plays a major role in nitrogen removal. Further research needs to focus on the emission characteristics of gaseous nitrogen(generated from the nitrification, denitrification, and completely autotrophic nitrogen-removal over nitrite(CANON) processes) with respect to their greenhouse effects.

关键词： Wastewater treatment Natural treatment technology Subsurface infiltration Nitrogen Biological process