检索结果-南通市图书馆

Bicontinuous porous membranes with micro-nano composite structure using a facile atomization-assisted nonsolvent induced phase separation method

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2022年第8期16卷 1268-1280页

作者： Jing Wang Guoyuan pan yu Li Yang Zhang Hongwei Shi Xuanbo Liu hao yu Muhua Zhao Yiqun Liu Changjiang Wu College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China SINOPEC Beijing Research Institute of Chemical Industry Beijing 100013China

The micro-nano composite structure can endow separation membranes with special surface properties,but it often has the problems of inefficient preparation process and poor structural *** this work,a novel atomization-assisted nonsolvent induced phase separation method,which is also highly efficient and very simple,has been *** using this method,a bicontinuous porous microfiltration membrane with robust micro-nano composite structure was obtained via commercially available polymers of polyacrylonitrile and *** formation mechanism of the micro-nano composite structure was *** microphase separation of polyacrylonitrile and polyvinylpyrrolidone components during the atomization pretreatment process and the hydrogen bonding between polyacrylonitrile and polyvinylpyrrolidone molecules should have resulted in the nano-protrusions on the membrane *** membrane exhibits superhydrophilicity in air and superoleophobicity *** membrane can separate both surfactant-free and surfactant-stabilized oil-in-water emulsions with high separation efficiency and permeation *** excellent antifouling property and robust microstructure,the membrane can easily be recycled for long-term ***,the scale-up verification from laboratory preparation to continuous production has been *** simple,efficient,cost-effective preparation method and excellent membrane properties indicate the great potential of the developed membranes in practical applications.

关键词： atomization nonsolvent induced phase

Microstructure and Mechanical Behavior of in Situ Primary Si/Mg_2Si Locally Reinforced Aluminum Matrix Composites Piston by Centrifugal Casting

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2011年第4期24卷 656-660页

作者： hao Xuhong LIU Changming pan Dengliang College of Material Science and Engineering Chongqing University Chongqing 40003 China

Al-Si pistons are frequently damaged by burning piston top surface due to elevated combustion temperature, and by rubbing the first ring groove against the engine cylinder liner. To prevent piston from these damages, some technologies were invented, such as mounting high Ni cast iron ring around the first ring groove in Al alloy piston body and thermal resistant steel on piston top surface, and fabricating Al composite pistons by squeeze casting for enhancing the whole or local piston performance. In this paper, composite pistons locally reinforced with in situ primary Si and primary Mg2Si particles are fabricated by centrifugal casting. The microstructure characteristics, hardness and wear resistance of the composite piston are investigated and the motion characteristic of the in situ particles in centrifugal field is analyzed. The results of the experiments show that primary Si and Mg2Si particles mix up with each other in melt and segregate at the regions of piston top and piston ring grooves under the effect of centrifugal force. Particulate reinforced regions have a higher hardness and better wear resistance compared with the unreinforced regions and this performance increases after heat treatment. The analysis result of particle movement shows that, primary Si and primary Mg2Si particles move at approximately the same velocity in the centrifugal field, because of the growth of primary Si and fusion after colliding between primary Si particles, which compromised the velocity difference of primary Si and primary Mg2Si particles caused by the difference of their densities. Research results have some theory significance and applicative value of project in development of new aluminum matrix composites piston products.

关键词： piston centrifugal casting in situ composite primary Si Mg2Si

Real-time tracking of ER turnover during ERLAD by a rhenium complex via lifetime imaging

在线全文

学校读者我要写书评

暂无评论

National Science Review 2022年第7期9卷 80-87页

作者： Liang hao yu-Yi Ling Zhi-Xin Huang Zheng-Yin pan Cai-Ping Tan Zong-Wan Mao MOE Key Laboratory of Bioinorganic and Synthetic Chemistry School of ChemistryState Key Laboratory of Oncology in South China Sun Yat-Sen University

Endoplasmic reticulum(ER) degradation by autophagy(ER-phagy) is a recently revealed selective autophagy pathway that plays important roles in organelle turnover and protein degradation,but the biological functions of ER-phagy are largely ***,we present an ER-targeting Re(I) tricarbonyl complex(Re-ERLAD) that can accumulate in the ER,induce ER-to-lys osome-associated degradation(ERLAD) upon visible light irradiation,and label ER buds and track their morphological alterations during *** emission of Re-ERLAD is sensitive to viscosity,which is a key parameter reflecting the amount of unfolded protein in the *** detection using two-photon fluorescence lifetime imaging microscopy shows that ER viscosity initially increases and then decreases during ERLAD,which reveals that ERLAD is a pathway for alleviating ER stress caused by unfolded *** conclusion,our work presents the first specific photoinducer and tracker of ERLAD,which can be used in studying the regulatory mechanism and function of this process.

关键词： rhenium ER-phagy viscosity TPFLIM

Synthesis and electrochemical properties of Mn-substituted high-capacity nickel hydroxide

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2022年第6期41卷 1977-1982页

作者： hao Lei Yang pan Rong-Gui Guo Jing Zhang Xue Han Li-Min yu Wen-Quan Jiang Research Institute of Rare Earth Metallurgical Materials and Applied Technology General Research Institute for Nonferrous MetalsBeijing 100088China

Nickel hydroxide is widely used as cathode materials in nickel-metal secondary *** this work,Mn-substituted nickel hydroxide samples with a special α/βmixed phase structure were synthesized by chemical co-precipitation *** physical properties were char-acterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),differential scanning calorimetry(DSC)and field emission scanning electron microscopy(FE-SEM).The results show that the structure of the samples and the amount of intercalated anions and water molecules are highly related to the content of the Mn *** electrochemical performances were characterized by charge/discharge tests and electrochemi-cal cycle *** results demonstrate that the Mn-sub-stituted samples with a α/β mixed phase structure perform a much higher discharge capacity than normal β-nickel *** specific discharge capacity reaches 330 mAh·g^(-1) after 50 cycles of charge/discharge in charging rate of 0.2C under ambient ***-while,the samples show no capacity loss in electrochem-ical cycles,which indicates that the mixed phase nickel hydroxide maintains high structure stability.

关键词： Nickel hydroxide Cathode material Nickel-metal battery Mixed phase Electrochemical performance

Hydrogen production via autothermal reforming of ethanol over noble metal catalysts supported on oxides

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2009年第2期18卷 191-198页

作者： Hongqing Chen hao yu Yong Tang Minqiang pan Guangxing Yang Feng Peng Hongjuan Wang Jian Yang School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 Guangdong China School of Mechanical and Automotive Engineering South China University of Technology Guangzhou 510640 Guangdong China

Hydrogen was produced over noble metal（Ir, Ru, Rh, Pd） catalysts supported on various oxides, including γ-Al2O3, CeO2, ZrO2 and La2O3, via the autothermal reforming reaction of ethanol （ATRE） and oxidative reforming reaction of ethanol （OSRE）. The conversion of ethanol and selectivites for hydrogen and byproducts such as methane, ethylene and acetaldehyde were studied. It was found that lanthana alone possessed considerable activity for the ATRE reaction, which could be used as a functional support for ATRE catalysts. It was demonstrated that Ir/La2O3 prevented the formation of methane, and Rh/La2O3 encumbered the production of ethylene and acetaldehyde. ATRE reaction was carried out over La2O3-supported catalysts （Ir/La2O3） with good stability on stream, high conversion, and excellent hydrogen selectivity approaching thermodynamic limit under autothermal condition. Typically, 3.4H2 molecules can be extracted from a pair of ethanol and water molecules over Ir（5wt%）/La2O3. The results presented in this paper indicate that Ir/La2O3 can be used as a promising catalyst for hydrogen production via ATRE reaction from renewable ethanol.

关键词： autothermal reforming ethanol hydrogen production iridium lanthanum oxide

Purely Inseparable Extensions and Ramification Filtrations

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2021年第1期37卷 35-58页

作者： hao yu HU Department of Mathematics Nanjing UniversityNanjing 210093P.R.China

In this article,we investigate the shift of Abbes and Saito’s ramification filtrations of the absolute Galois group of a complete discrete valuation field of positive characteristic under a purely inseparable *** als... 详细信息

关键词： Abbes and Saito’s ramification filtration purely inseparable extension characteristic form

Some 3-adic congruences for binomial sums

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2014年第4期57卷 711-718页

作者： ZHANG Yong pan hao Department of Basic Course Nanjing Institute of Technology Department of Mathematics Nanjing University

We prove some 3-adic congruences for binomial sums,which were conjectured by Zhi-Wei *** example,for any integer m≡1（mod 3）and any positive integer n,we have v3（1/n ∑n-1X k=0 1/mk 2k/ k〉））≥min{3（n）,3（m-1）-1},where 3（n）denotes the 3-adic order of *** our proofs,we use several auxiliary combinatorial identities and a series converging to 0 over the 3-adic field.

关键词： 3-adic order binomial sum

Colonization by Klebsiella variicola FH-1 stimulates soybean growth and alleviates the stress of Sclerotinia sclerotiorum

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2023年第9期22卷 2729-2745页

作者： ZHAI Qian-hang pan Ze-qun ZHANG Cheng yu Hui-lin ZHANG Meng GU Xue-hu ZHANG Xiang-hui pan Hong-yu ZHANG hao College of Plant Protection Jilin Agricultural UniversityChangchun 130118P.R.China College of Plant Sciences Jilin UniversityChangchun 130062P.R.China

Sclerotinia stem rot,caused by Sclerotinia sclerotiorum,is a destructive soil-borne disease leading to huge yield *** previously reported that Klebsiella variicola FH-1 could degrade atrazine herbicides,and the vegetative growth of atrazine-sensitive crops(i.e.,soybean)was significantly increased in the FH-1-treated ***,we found that FH-1 could promote soybean growth and induce resistance to *** our study,strain FH-1 could grow in a nitrogen-free environment,dissolve inorganic phosphorus and potassium,and produce indoleacetic acid and a *** results of pot experiments showed that *** FH-1 promoted soybean plant development,substantially improving plant height,fresh weight,and root length,and induced resistance against *** infection in soybean *** area under the disease progression curve(AUDPC)for treatment with strain FH-1 was significantly lower than the control and was reduced by up to 42.2%within 48 h(P<0.001).Moreover,strain FH-1 rcovered the activities of catalase,superoxide dismutase,peroxidase,phenylalanine ammonia lyase,and polyphenol oxidase,which are involved in plant protection,and reduced malondialdehyde accumulation in the *** mechanism of induction of resistance appeared to be primarily resulted from the enhancement of transcript levels of PR10,PR12,AOS,CHS,and PDF1.2 *** colonization of FH-1 on soybean root,determined using CLSM and SEM,revealed that FH-1 colonized soybean root surfaces,root hairs,and exodermis to form *** summary,*** FH-1 exhibited the biological control potential by inducing resistance in soybean against *** infection,providing new suggestions for green prevention and control.

关键词： sclerotinia stem rot of soybean Klebsiella variicola FH-1 inducing resistance root colonization biofilm

Vehicle identification by improved stacking via kernel principal component regression

在线全文

学校读者我要写书评

暂无评论

International Journal of Intelligent Computing and Cybernetics 2014年第4期7卷 415-435页

作者： Bailing Zhang hao pan Department of Computer Science and Software Engineering Xi’an Jiaotong-Liverpool UniversitySuzhouChina Lucas Varity Langzhong Brake Co.Ltd Langfang Development ZoneHebeiChina

Purpose–Many applications in intelligent transportation demand accurate categorization of *** purpose of this paper is to propose a working image-based vehicle classification *** first component vehicle detection is implemented by applying Dalal and Triggs’s histograms of oriented gradients features and linear support vector machine(SVM)*** second component vehicle classification,which is the emphasis of this paper,is accomplished by an improved stacked *** an effective ensemble learning strategy,stacked generalization has been proposed to combine multiple models using the concept of a ***,it was found that the well-known meta-learning scheme multi-response linear regression(MLR)for stacked generalization performs poorly on the vehicle ***/methodology/approach–A new meta-learner is then proposed based on kernel principal component regression(KPCR).The stacked generalization scheme consists of a heterogeneous classifier ensemble with seven base classifiers,*** discriminant classifier,fuzzy k-nearest neighbor,logistic regression,Parzen classifier,Gaussian mixture model,multiple layer perceptron and ***–Experimental results using more than 2,500 images from four types of vehicles(bus,light truck,car and van)demonstrated the effectiveness of the proposed *** improved stacked generalization produced consistently better results when compared to any of the single base classifier used and four other beta learning algorithms,including MLR,majority voting,logistic regression and decision ***/value–With the seven base classifiers,the KPCR-based stacking offers a performance of 96 percent accuracy and 95 percent k coefficient,thus exhibiting promising potentials for real-world applications.

关键词： Intelligent transportation Learning Pattern recognition