检索结果-南通市图书馆

Toluene Alkylation to Selective Formation of p-Xylene over Co-Crystalline ZSM-12/ZSM-5 Catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2007年第1期16卷 37-41页

作者： p.N.Joshi p.S.Niphadkar p.A.Desai R.patil V.V.Bokade Catalysis Division National Chemical LaboratoryPune-411008India

The alkylation of toluene with methanol to selective formation of p-xylene has been systematically studied. ZSM-12 （MTW）/ZSM-5 co-crystalline zeolite in 40：60 proportions have been synthesized by the same molar gel composition, but at different temperatures and periods than that of ZSM-12 and ZSM-5, separately. All the prepared samples are characterized by XRD, SEM, BET, and XRF. The activity of toluene alkylation was investigated with a mixture of toluene and methanol as a feed over the ZSM-12, ZSM-12/ZSM-5 co-crystalline, ZSM-5, and physical mixture of ZSM-12/ZSM-5. From characterization, it is observed that the ZSM-12/ZSM-5 co-crystalline material is different from that of ZSM-12, ZSM-5, and their physical mixture. Further, the ZSM-12/ZSM-5 co-crystalline zeolite produces the highest content of xylene and has better selectivity for p-xylene than ZSM-12, ZSM-5, and their physical mixture.

关键词： ZSM-12 ZSM-5 co-crystalline toluene alkylation p-xylene

Torsion Completeness of Sylow p-Groups in Semisimple Group Rings

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2004年第5期20卷 893-898页

作者： p.V.DANCHEV Mathematical Department Plovdiv State UniversityPlovdiv 4000Bulgaria Insurance Supervision DirectorateMinistry of FinanceSofia 1000Bulgaria

Let G be an abelian p-group and K be a field of the first kind with respect to p of charK p and of s_p(K)=N or N∪{0}.Then it is shown that the normed Sylow p-subgroup S(KG)is torsion complete if and only if G is bounded(Theorem 1).An analogous fact is proved for the case when K is of the second kind(Theorem 2).These completely settle a conjecture posed by us in ***. ***.(1993)and are also a supplement to our result in the modular case published in Acta ***.(1997).

关键词： Normalized p-units Fields of the first and of the second type Torsion complete primary components

Arnie Levine and the MDM2-p53 discovery:a postdoctoral fellow's perspective

在线全文

学校读者我要写书评

暂无评论

Journal of Molecular Cell Biology 2019年第7期11卷 620-623页

作者： Gerard p.Zambetti Department of pathology St. Jude Children's Research Hospital262 Danny Thomas PlaceMemphisTN 38105USA

It was early 1990 that we had gathered at Arnie Levine's home for dinner to celebrate the transition of several postdoctoral fellows to faculty positions in *** a new postdoctoral fellow in his lab,I was thrilled to have the opportunity to spend some personal time with *** were discussing the paradigm shift made by his group a year earlier that p53 is a tumour suppressor (Finlay et at.,1989) and not an on cogene,as origi nally thought for a decade after its original discovery (Lane and Crawford,1979;Linzer and Levine,1979).

关键词： dinner group time

An ecofriendly approach for corrosion control of 6061 Al-15%(v)SiC(p)composite and its base alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2017年第3期25卷 363-372页

作者： Charitha B.p. padmalatha Rao Department of chemistry Manipal Institute of TechnologyManipalUdupiKamatakaIndia

Corrosion inhibition characteristics of bio polymer dextran was studied for the corrosion control of 6061 Al-15%_((v)) SiC_((p)) composite and its base alloy in 1 mol·L^(-1) HCl. Standard electrochemical techniques such as potentiodynamic polarization(pDp) measurements and electrochemical impedance spectroscopy(EIS) method were adopted for corrosion rate measurement. Surface morphology was studied by scanning electron microscopy(SEM) and elemental mapping was done by energy dispersive X-ray(EDX) analysis. Suitable mechanism was proposed for corrosion and inhibition process. Results indicated that dextran acts as an excellent anticorrosive agent for the corrosion control of 6061 Al-15%_((v)) SiC_((p)) composite, with maximum inhibition efficiency of 91% for the concentration of 0.4 g·L^(-1) at 303 K. Dextran acted as a mixed type of inhibitor, and got physically adsorbed both on composite and base alloy by obeying Langmuir adsorption isotherm. Dextran is proved to be a green inhibitor with environmental and economic benefits.

关键词： 6061 Al-15%(v) SiC(p) composite Green inhibitor Biopolymer Electrochemical studies SEM–EDX

Spiking neural p systems with neuron division and budding

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2011年第8期54卷 1596-1607页

作者： p■UN Gheorghe pREZ-JIMNEZ Mario J. Department of Computer Science and Artificial Intelligence University of Sevilla Avda Reina Mercedes s/n 41012 Sevilla Spain Institute of Mathematics of the Romanian Academy pO Box 1-764 014700 Bucuresti Romania

Spiking neural p systems are a class of distributed and parallel computing models inspired by spiking *** this work,the features of neuron division and neuron budding are introduced into the framework of spiking neural p systems,which are processes inspired by neural stem cell division. With neuron division and neuron budding,a spiking neural p system can generate exponential work space in polynomial time as the case for p systems with active *** this way,spiking neural p systems can efficiently solve computationally hard problems by means of a space-time tradeoff,which is illustrated with an efficient solution to SAT problem.

关键词： natural computing membrane computing spiking neural p system neuron division

Universal enzymatic numerical p systems with small number of enzymatic variables

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2018年第9期61卷 38-49页

作者： Zhiqiang ZHANG Tingfang WU ANDrei p■UN Linqiang pAN Key Laboratory of Image Information processing and Intelligent Control of Education Ministry of China School of Automation Huazhong University of Science and Technology School of Electric and Information Engineering Zhengzhou University of Light Industry Bioinformatics Department National Institute of Research and Development for Biological Sciences Department of Computer Science Faculty of Mathematics and Computer ScienceUniversity of Bucharest

Numerical p systems(for short, Np systems) are distributed and parallel computing models inspired from the structure of living cells and economics. Enzymatic numerical p systems(for short, ENp systems) are a variant of Np systems, which have been successfully applied in designing and implementing controllers for mobile robots. Since ENp systems were proved to be Turing universal, there has been much work to simplify the universal systems, where the complexity parameters considered are the number of membranes, the degrees of polynomial production functions or the number of variables used in the *** the number of enzymatic variables, which is essential for ENp systems to reach universality, has not been investigated. Here we consider the problem of searching for the smallest number of enzymatic variables needed for universal ENp systems. We prove that for ENp systems as number acceptors working in the all-parallel or one-parallel mode, one enzymatic variable is sufficient to reach universality; while for the one-parallel ENp systems as number generators, two enzymatic variables are sufficient to reach *** results improve the best known results that the numbers of enzymatic variables are 13 and 52 for the all-parallel and one-parallel systems, respectively.

关键词： bio-inspired computing numerical p system mobile robot membrane controller universality

Understanding p53 functions through p53 antibodies

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Molecular Cell Biology 2019年第4期11卷 317-329页

作者： Kanaga Sabapathy David p.Lane Laboratory of Molecular Carcinogenesis Division of Cellular & Molecular Research Humphrey Oei Institute of Cancer Research National Cancer Centre Singapore Singapore 169610 Singapore Cancer and Stem Cell Biology program Duke-NUS Medical School Singapore 169857 Singapore Department of Biochemistry National University of Singapore (NUS) Singapore 117597 Singapore Institute of Molecular and Cellular Biology Singapore 138673 Singapore p53 Laboratory Singapore 138648

Tp53 is the most frequently mutated gene across all cancer types. Our understanding of its functions has evolved since its discovery four decades ago. Initially thought to be an oncogene, it was later realized to be a critical tumour suppressor. A significant amount of our knowledge about p53 functions have come from the use of antibodies against its various forms. The early anti-p53 antibodies contributed to the recognition of p53 accumulation as a common feature of cancer cells and to our understanding of p53 DNA-binding and transcription activities. They led to the concept that conformational changes can facilitate p53’s activity as a growth inhibitory protein. The ensuing p53 conformational-specific antibodies further underlined p53’s conformational flexibility, collectively forming the basis for current efforts to generate therapeutic molecules capable of altering the conformation of mutant p53. A subsequent barrage of antibodies against post-translational modifications on p53 has clarified p53’s roles further, especially with respect to the mechanistic details and context-dependence of its activity. More recently, the generation of p53 mutation-specific antibodies have highlighted the possibility to go beyond the general framework of our comprehension of mutant p53-and promises to provide insights into the specific properties of individual p53 mutants. This review summarizes our current knowledge of p53 functions derived through the major classes of anti-p53 antibodies, which could be a paradigm for understanding other molecular events in health and disease.

关键词： antibodies conformation mutant p53 post-translational modifications

parallel Fuzzy p+Fuzzy I+Fuzzy D Controller:Design and performance Evaluation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2010年第4期7卷 463-471页

作者： Vineet Kumar A.p.Mittal Department of Instrumentation and Control Engineering Netaji Subhash Institute of TechnologySector-3

In this paper, a parallel fuzzy proportional plus fuzzy integral plus fuzzy derivative （Fp＋FI＋FD） controller is proposed. It is derived from the conventional parallel proportional-integral-derivative （pID） controller. It preserves the linear structure of a conventional parallel pID controller, with analytical formulas. The final shape of the controller is a discrete-time fuzzy version of a conventional parallel pID controller. Computer simulations are performed to evaluate the performance of the Fp＋FI＋FD controller for setpoint tracking and load-disturbance rejection for some complex processes, such as first- and second-order processes with delay, inverse response process with and without delay and higher order processes. Also, the performance of the proposed fuzzy controller is evaluated experimentally on highly nonlinear liquid-flow process with a hysteresis characteristic due to a pneumatic control valve. The simulation and real time control is done using National InstrumentTM hardware and software （LabVIEWTM）. The response of the Fp＋FI＋FD controller is compared with the conventional parallel pID controller, tuned with the Ziegler-Nichols （Z-H） and /~strSm- H^gglund （A-H） tuning technique. It is observed that the Fp＋FI＋FD controller performed much better than the conventional pI/pID controller. Simulation and experimental results demonstrate the effectiveness of the proposed parallel Fp＋FI＋FD controller.

关键词： proportional-integral-derivative (pID) fuzzy proportional plus fuzzy integral plus fuzzy derivative (Fp+FI+FD) controller liquid-flow process inverse response process dead time.

High black carbon and ozone concentrations during pollution transport in the Himalayas: Five years of continuous observations at NCO-p global GAW station

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第8期25卷 1618-1625页

作者： A. Marinoni p. Cristofanelli p. Laj R. Duchi D. putero F. Calzolari T. C. Landi E. Vuillermoz M. Maione p. Bonasoni Institute for Atmospheric Sciences and Climate National Research Council of Italy Laboratoire de Glaciologie et Géophysique de l'Environnement Université Grenoble 1 CNRS EV-K2-CNR Committee Urbino University DiSBeF

To study the influence of polluted air-mass transport carrying ozone （O3） and black carbon （BC） in the high Himalayas, since March 2006 the Nepal Climate Observatory at pyramid （NCO-p） GAW-WMO global station （Nepal, 5079 m a.s.l.） is operative. During the first 5-year measurements, the O3 and BC concentrations have shown a mean value of 48 ± 12 ppb （± standard deviation） and 208 ± 374 ng/m3, respectively. Both O3 and BC showed well defined seasonal cycles with maxima during pre-monsoon （O3 ： 61.3 ± 7.7 ppbV; BC： 444 ± 433 ng/m3） and minima during the summer monsoon （O3 ： 40.1 ± 12.4 ppbV; BC： 64 ± 101 ng/m3）. The analysis of the days characterised by the presence of a significant BC increase with respect to the typical seasonal cycle identified 156 days affected by ＂acute＂ pollution events, corresponding to 9.1% of the entire data-set. Such events mostly occur in the pre-monsoon period, when the O3 diurnal variability is strongly related to the transport of polluted air-mass rich on BC. On average, these ＂acute＂ pollution events were characterised by dramatic increases of BC （352%） and O3 （29%） levels compared with the remaining days.

关键词： ozone black carbon Himalayas pollution biomass burning troposphere