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Emergency membrane contactor based absorption system for ammonia leaks in water treatment plants

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Journal of Environmental Sciences 2008年第10期20卷 1189-1194页

作者： SHAO Jiahui, FANG Xuliang, HE yiliang, jin Qiang School of Environmental Science and Engineering, Shanghai Jiao Tong Univerisity, 800 Dongchuan Road, Shanghai 200240, China [a]School of Environmental Science Engineering Shanghai Jiao Tong Univerisity 800 Dongchuan Road Shanghai 200240 China

Because of the suspected health risks of trihalomethanes (THMs), more and more water treatment plants have replaced traditional chlorine disinfection process with chloramines but often without the proper absorption system installed in the case of ammonia leaks in the storage room. A pilot plant membrane absorption system was developed and installed in a water treatment plant for this purpose. Experimentally determined contact angle, surface tension, and corrosion tests indicated that the sulfuric acid was the proper choice as the absorbent for leaking ammonia using polypropylene hollow fiber membrane contactor. Effects of several operating conditions on the mass transfer coeffcient, ammonia absorption, and removal effciency were examined, including the liquid concentration, liquid velocity, and feed gas concentration. Under the operation conditions investigated, the gas absorption effciency over 99.9% was achieved. This indicated that the designed pilot plant membrane absorption system was effective to absorb the leaking ammonia in the model storage room. The removal rate of the ammonia in the model storage room was also experimentally and theoretically found to be primarily determined by the ammonia suction flow rate from the ammonia storage room to the membrane contactor. The ammonia removal rate of 99.9% was expected to be achieved within 1.3 h at the ammonia gas flow rate of 500 m3/h. The success of the pilot plant membrane absorption system developed in this study illustrated the potential of this technology for ammonia leaks in water treatment plant, also paved the way towards a larger scale application.

关键词： membrane contactor polypropylene hollow fiber ammonia absorption water treatment plants

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铁蛋白:疫苗设计新平台

科学 2022年第4期74卷 44-48页

作者：谢佳颖金奕良范克龙中国科学院生物物理研究所北京100101

作为一种广泛存在于生物体中的储铁蛋白质,铁蛋白具有易于修饰,易于量产和稳定、安全的特性。在重组疫苗领域,凭借自组装和三重对称轴的特性,铁蛋白可实现多价抗原及多种抗原的展示,并在空间结构上实现抗原的三聚化,成为疫苗领域广受关... 详细信息

作为一种广泛存在于生物体中的储铁蛋白质,铁蛋白具有易于修饰,易于量产和稳定、安全的特性。在重组疫苗领域,凭借自组装和三重对称轴的特性,铁蛋白可实现多价抗原及多种抗原的展示,并在空间结构上实现抗原的三聚化,成为疫苗领域广受关注的新平台。

关键词：铁蛋白疫苗基因工程设计自组装抗原展示

Fluorescence detection of phosphate in an aqueous environment by an aluminum-based metal-organic framework with amido functionalized ligands

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Frontiers of Environmental Science & Engineering 2022年第12期16卷 111-120页

作者： Peng Li Lingqian Dong Han jin jingren Yang Yonghui Tu Chao Wang yiliang He School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China China-UK Low Carbon College Shanghai Jiao Tong UniversityShanghai200240China Department of Instrument Science and Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai200240China

The on-site monitoring of phosphate is important for environmental *** phosphate detection methods are not appropriate to on-site monitoring owing to the use of complicated detection procedures,and the consequent high cost and maintenance requirements of the detection ***,a highly sensitive fluorescence-based method for phosphate detection with a wide detection range was developed based on a luminescent aluminum-based metal-organic framework(Al-MOF).The Al-MOF was prepared by introducing amine functional groups to conventional MIL to enhance phosphate binding,and exhibited excellent fluorescence properties that originated from the ligand-to-metal charge transfer(LMCT).The detection limit was as low as 3.25µmol/L(0.10 mg/L)and the detection range was as wide as 3–350µmol/L(0.10–10.85 mg/L).Moreover,Al-MOF displayed specific recognition toward phosphate over most anions and metal cations,even for a high concentration of the co-existent *** mechanism of phosphate detection was analyzed through the characterization of the combination of Al-MOF and phosphate,and the results indicated the high affinity between Al-O and phosphate inhibited that the LMCT process and recovered the intrinsic fluorescence of NH2−*** recovery of the developed detection method reached a satisfactory range of 85.1%–111.0%,and the feasibility of on-site phosphate detection was verified using a prototype sensor for tap water and lake water *** was demonstrated that the prepared Al-MOF is highly promising for on-site detection of phosphate in an aqueous environment.

关键词： Fluorescence Metal-organic framework Phosphate Detection Al-MOF

Generative Trapdoors for Public Key Cryptography Based on Automatic Entropy Optimization

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China Communications 2021年第8期18卷 35-46页

作者： Shuaishuai Zhu yiliang Han College of Cryptography Engineering Engineering University of People’s Armed PoliceXi’an 710086China Key Laboratory of Network and Information Security under the People’s Armed Police Xi’an 710086China

Trapdoor is a key component of public key cryptography design which is the essential security foundation of modern ***,the traditional way in designing a trapdoor is to identify a computationally hard problem,such as the NPC *** the trapdoor in a public key encryption mechanism turns out to be a type of limited *** this paper,we generalize the methodology of adversarial learning model in artificial intelligence and introduce a novel way to conveniently obtain sub-optimal and computationally hard trapdoors based on the automatic information theoretic search *** basic routine is constructing a generative architecture to search and discover a probabilistic reversible generator which can correctly encoding and decoding any input *** architecture includes a trapdoor generator built on a variational autoencoder(VAE)responsible for searching the appropriate trapdoors satisfying a maximum of entropy,a random message generator yielding random noise,and a dynamic classifier taking the results of the two *** evaluation of our construction shows the architecture satisfying basic indistinguishability of outputs under chosen-plaintext attack model(CPA)and high efficiency in generating cheap trapdoors.

关键词： generative model public key encryption indistinguishability model security model deep learning

Removing polybrominated diphenyl ethers in pure water using Fe/Pd bimetallic nanoparticles

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Frontiers of Environmental Science & Engineering 2015年第5期9卷 832-839页

作者： Min ZHANG Jian LU ZhenchengXU yiliang HF Bo ZHANG Song jin Brian BOMAN School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Indian River Research and Education-Cenierl U-niversi-ty- of-Florida Fort PierceFL34945USA South China Institute of Environment Sciences Ministry of Environmental Protection Guangzhou 510655 China Department of Civil and Architectural Engineering University of Wyoming Laramie WY 82071 USA

Polybrominated diphenyl ethers （PBDEs） have been widely used as fire-retardants. Due to their high production volume, widespread usage, and environmental persistence, PBDEs have become ubiquitous contaminants in various *** zero-valent iron （ZVI） is an effective reductant for many halogenated organic compounds. To enhance the degradation efficiency, ZVI/ Palladium bimetallic nanoparticles （nZVI/Pd） were synthe- sized in this study to degrade decabromodiphenyl ether （BDE209） in water. Approximately 90% of BDE209 was rapidly removed by nZVI/Pd within 80 min, whereas about 25% of BDE209 was removed by nZVL Degradation of BDE209 by nZVI/Pd fits pseudo-first-order kinetics. An increase in pH led to sharply decrease the rate of BDE209 degradation. The degradation rate constant in the treatment with initial pH at 9.0 was more than 6.8 x higher than that under pH 5.0. The degradation intermediates of BDE209 by nZVI/Pd were identified and the degradation pathways were hypothesized. Results from this study suggest that nZV//Pd may be an effective tool for treating polybromi- nated diphenyl ethers （PBDEs） in water.

关键词： bimetallic nanoparticles nanoscale zerovalent iron polybrominated diphenyl ethers degradation

An Automatic Analysis Approach Toward Indistinguishability of Sampling on the LWE Problem

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Tsinghua Science and Technology 2020年第5期25卷 553-563页

作者： Shuaishuai Zhu yiliang Han Xiaoyuan Yang the College of Cryptography Engineering Engineering University of People's Armed PoliceXi'an 710086China the Key Laboratory of Network and Information Security under the People's Armed Police Engineering University of People's Armed PoliceXi'an 710086China

Learning With Errors (LWE) is one of the Non-Polynomial (NP)-hard problems applied in cryptographic primitives against quantum ***,the security and efficiency of schemes based on LWE are closely affected by the error sampling *** existing pseudo-random sampling methods potentially have security leaks that can fundamentally influence the security levels of previous cryptographic *** that these primitives are proved semantically secure,directly deducing the influences caused by leaks of sampling algorithms may be ***,we attempt to use the attack model based on automatic learning system to identify and evaluate the practical security level of a cryptographic primitive that is semantically proved secure in indistinguishable security *** this paper,we first analyzed the existing major sampling algorithms in terms of their security and ***,concentrating on the Indistinguishability under Chosen-Plaintext Attack (IND-CPA) security model,we realized the new attack model based on the automatic learning *** experimental data demonstrates that the sampling algorithms perform a key role in LWE-based schemes with significant disturbance of the attack advantages,which may potentially compromise security ***,our attack model is achievable with acceptable time and memory costs.

关键词： lattice-based cryptography learning with errors security model Non-Polynomial(NP)-hard problems

Optimizing progress variable definition in flamelet-based dimension reduction in combustion

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Applied Mathematics and Mechanics(English Edition) 2015年第11期36卷 1481-1498页

作者： jing CHEN Minghou LIU yiliang CHEN Department of Thermal Science and Energy Engineering University of Science and Technology of China

An automated method to optimize the definition of the progress variables in the flamelet-based dimension reduction is proposed. The performance of these optimized progress variables in coupling the flamelets and flow solver is presented. In the proposed method, the progress variables are defined according to the first two principal components （PCs） from the principal component analysis （PCA） or kernel-density-weighted PCA （KEDPCA） of a set of flamelets. These flamelets can then be mapped to these new progress variables instead of the mixture fraction/conventional progress variables. Thus, a new chemistry look-up table is constructed. A priori validation of these optimized progress variables and the new chemistry table is implemented in a CH4/N2/air lift-off flame. The reconstruction of the lift-off flame shows that the optimized progress variables perform better than the conventional ones, especially in the high temperature area. The coefficient determinations （R2 statistics） show that the KEDPCA performs slightly better than the PCA except for some minor species. The main advantage of the KEDPCA is that it is less sensitive to the database. Meanwhile, the criteria for the optimization are proposed and discussed. The constraint that the progress variables should monotonically evolve from fresh gas to burnt gas is analyzed in detail.

关键词： principal component analysis (PCA),oprogress variable flamelet-basedmodel dimension reduction

Comparison of the effects of submerged laser peening,cavitation peening and shot peening on the improvement of the fatigue strength of magnesium alloy AZ31

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Journal of Magnesium and Alloys 2023年第5期11卷 1592-1607页

作者： Hitoshi Soyama Chieko Kuji yiliang Liao Department of Finemechanics Tohoku University6-6-01 AobaAramakiAoba-kuSendai 980-8579Japan Department of Industrial and Manufacturing Systems Engineering Iowa State University2529 Union Dr.AmesIA 50011United States of America

To investigate the improvement in the fatigue strength of magnesium alloy by peening methods,magnesium alloy AZ31 was treated by submerged laser peening(SLP),cavitation peening(CP),and shot peening(SP),and the fatigue properties were evaluated by a plane bending fatigue *** the case of SLP,both the impact induced by laser ablation(LA)and that caused by laser cavitation(LC),which developed after LA,were *** the present study,the fatigue life at a constant bending stress was examined to determine the suitable *** was found that the fatigue strengths at N=10^(7)for the SLP,CP,and SP specimens treated by each optimum condition were 56%,18%,and 16%higher,respectively,than that of the non-peened(NP)specimen,which was 97 *** key factors in the improvement of fatigue strength by peening methods were work hardening and the introduction of compressive residual stress.

关键词： Magnesium alloy Fatigue strength Laser peening Cavitation peening Shot peening

On the Properties of Cheng Projection

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Journal of Systems Science & Complexity 2021年第4期34卷 1471-1486页

作者： FENG Jun-e ZHANG Qingle LI yiliang School of Mathematics Shandong UniversityJinan 250100China

This paper mainly investigates some properties of Cheng projection,which was proposed recently by *** to reduce the dimension of *** a linear transformation from the original vector space to the target vector space,the matrix representation of Cheng projection is ***,the structure matrix of Cheng projection,called the Cheng projection matrix,is *** properties of Cheng projection are derived via its projection ***,the product and norm of Cheng projection matrices are concerned.

关键词： Cheng projection Cheng projection matrix Euclid norm matrix representation