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Synthesis of mono and bis-4-methylpiperidiniummethyl-urea as corrosion inhibitors for steel in acidic media

Abbas TEIMOURI, Nasrin SOLTANI, Alireza Najafi CHERMAHINI

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 1,   Pages 43-50 doi: 10.1007/s11705-010-0532-7

Abstract: Mono and bis-4-methylpiperidiniummethyl urea were synthesized, characterized and used as new corrosion inhibitors of mild steel in the acidic media. Inhibitory effect of two compounds on mild steel surface in the 1 mol·L sulphuric acid has been studied by a series of techniques, such as potentiodynamic polarization, weight loss and quantum chemical calculation methods. Potentiodynamic polarization measurements showed that two inhibitors are mixed type. All measurements showed that inhibition efficiencies enhanced with increase of inhibitor concentration. This reveals that inhibitive actions of inhibitors were mainly due to adsorption on mild steel surface. Density functional (DFT) calculations have been carried out for the title compounds by performing HF and DFT levels of theory using the standard 6-31G* basis set.

Keywords： corrosion inhibitors     mild steel     acidic medium     theoretical studies     DFT    

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A review on different theoretical models of electrocaloric effect for refrigeration

Frontiers in Energy 2023, Volume 17, Issue 4,   Pages 478-503 doi: 10.1007/s11708-023-0884-6

Abstract: This paper reviews the electrocaloric effect of ferroelectric materials based on different theoretical

Keywords： electrocaloric effect     effective Hamiltonian     phase-field modeling     different theoretical models    

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Genome-wide association studies: inherent limitations and future challenges

Yan Du, Jiaxin Xie, Wenjun Chang, Yifang Han, Guangwen Cao

Frontiers of Medicine 2012, Volume 6, Issue 4,   Pages 444-450 doi: 10.1007/s11684-012-0225-3

Abstract:

Genome-wide association studies (GWAS) have achieved great success in identifying genetic variantsDeep sequencing followed by functional studies will be needed to elucidate the underpinning biological

Keywords： genome-wide association studies (GWAS)     genetic variant     cancer     limitation     challenge    

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Genomic and pharmacogenetic studies of childhood acute lymphoblastic leukemia

Ching-Hon Pui

Frontiers of Medicine 2015, Volume 9, Issue 1,   Pages 1-9 doi: 10.1007/s11684-015-0381-3

Abstract:

With the cure rate of childhood acute lymphoblastic leukemia (ALL) approaching 90%, further improvement in the treatment outcome and quality of life of patients will require better understanding of the mechanisms of drug resistance, identifying new leukemic cell genetic lesions that are amendable to available target therapy, and optimizing treatment based on host pharmacodynamics and pharmacogenomics. Deeper characterization of leukemic cell genetic abnormalities has discovered new subtypes of leukemia such as early T-cell precursor ALL and Philadelphia chromosome-like ALL, and identified many genomic alterations that have diagnostic, prognostic, or therapeutic implications. In this regard, several novel fusion transcripts are responsive to ABL tyrosine kinase inhibitors and potentially to JAK inhibitors. Genome-wide analyses have also unraveled the role of inherited cancer predisposing genes and small nucleotide polymorphisms of several genes in the development of childhood ALL. These advances promise to lead to more sophisticated personalized treatment strategies in the near future.

Keywords： pharmacogenomics     acute lymphoblastic leukemia     genomics     pharmacogenetics    

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NOx removal by non-thermal plasma reduction: experimental and theoretical investigations

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 10,   Pages 1476-1484 doi: 10.1007/s11705-022-2165-z

Abstract: This work presents the experimental and theoretical study on the Keywords： ${\rm{NO}}_x $ removal     NTP reduction     mechanism     energy consumption    

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Thermal transport properties of monolayer phosphorene: a mini-review of theoretical studies

Guangzhao QIN, Ming HU

Frontiers in Energy 2018, Volume 12, Issue 1,   Pages 87-96 doi: 10.1007/s11708-018-0513-y

Abstract: Considering the fact that there have been so many studies on the thermal transport in phosphorene, itis on emerging demand to have a review on the progress of previous studies and give an outlook on future

Keywords： thermal transport     phosphorene     resonant bonding    

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Prediction of the theoretical and semi-empirical model of ambient temperature

Foued CHABANE,Noureddine MOUMMI,Abdelhafid BRIMA,Abdelhafid MOUMMI

Frontiers in Energy 2016, Volume 10, Issue 3,   Pages 268-276 doi: 10.1007/s11708-016-0413-y

Abstract: It is well known that the ambient temperature is a sensitive parameter which has a great effect on biology, technology, geology and even on human behavior. A prediction is a statement about an uncertain event. It is often, but not always, based upon experience or knowledge. Although guaranteed accurate information about the future is in many cases impossible, prediction can be useful to assist in making plans about possible developments. As a result, temperature profiles can be developed which accurately represent the expected ambient temperature exposure that this environment experiences during measurement. The ambient temperature over time is modeled based on the previous and data and using a Lagrange interpolation. To observe the comprehensive variation of ambient temperature the profile must be determined numerically. The model proposed in this paper can provide an acceptable way to measure the change in ambient temperature.

Keywords： ambient temperature     environment     correlation     theoretical model     semi-empirical    

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Theoretical and technological exploration of deep

Heping XIE, Yang JU, Shihua REN, Feng GAO, Jianzhong LIU, Yan ZHU

Frontiers in Energy 2019, Volume 13, Issue 4,   Pages 603-611 doi: 10.1007/s11708-019-0643-x

Abstract: To effectively acquire coal resources deeper than 2000 m, new theoretical and technological conceptsThen, it presents a new theoretical concept, including the theories of mining-induced rock mechanics,In summary, this paper develops new theoretical and technological systems for accomplishing groundbreaking

Keywords： coal resource     deep in situ     fluidized mining     theoretical system     key technologies     strategic roadmap    

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Theoretical analysis and experimental investigation of valveless piezoelectric pump with unsymmetrical

ZHANG Jianhui, LU Jizhuang, XIA Qixiao, LI Hong

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 13-19 doi: 10.1007/s11465-007-0002-1

Abstract: Meanwhile, the theoretical equation of the pump flow rate is established.It is proved that the theory is rational and correct by comparing the experimental flow rate and the theoreticalIn addition, for calculating the theoretical flow rate, the positive and converse flow resistance coefficients

Keywords： unsymmetrical     theoretical flow     theoretical equation     pump flow     converse flow    

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Progress of Brain Network Studies on Anesthesia and Consciousness: Framework and Clinical Applications Review

Jun Liu, Kangli Dong, Yi Sun, Ioannis Kakkos, Fan Huang, Guozheng Wang, Peng Qi, Xing Chen, Delin Zhang, Anastasios Bezerianos, Yu Sun

Engineering 2023, Volume 20, Issue 1,   Pages 77-95 doi: 10.1016/j.eng.2021.11.013

Abstract: This review summarizes recent research on brain network studies of anesthesia, and compares the underlying

Keywords： Anesthesia     Brain network     Connectivity     Graph theoretical analysis     Clinical monitoring system    

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Data quality assessment for studies investigating microplastics and nanoplastics in food products: Are

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 8, doi: 10.1007/s11783-023-1694-0

Abstract:

● Data quality assessment criteria for MP/NPs in food products were developed.

Keywords： Microplastic     Nanoplastic     Food products     Data quality     Human health risk    

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Technical studies on high-speed turnouts for china railways

He Huawu

Strategic Study of CAE 2009, Volume 11, Issue 5,   Pages 23-30

Abstract:

High-speed turnout serves as a vital part of track structure for high-speed railway, and its structure and condition play an important role in train running safety and quality. In this paper, design parameters and linear plane of high-speed turnout, main structure characteristics of components (including fastening, turnout sleeper, switching system etc.), design theories of high-speed turnout, relevant technical requirements as well as innovative achievements are described, which will offer remarkable guiding significance for the further R&D, test, verification and wide-use of high-speed turnout in China railways.

Keywords： high-speed railway     high-speed turnout     technical studies    

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ROUTE DEVELOPMENT, ANTIVIRAL STUDIES, FIELD EVALUATION AND TOXICITY OF AN ANTIVIRAL PLANT PROTECTANT

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 1, doi: 10.15302/J-FASE- 2021390

Abstract: route provides a solid foundation for its large-scale synthesis and subsequent efficacy and toxicity studies

Keywords： antiviral plant protectant / antiviral in the greenhouse / field evaluation / l-trp-NCA / synthesis optimization / toxicity tests    

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Mechanism insight into the formation of HS from thiophene pyrolysis: A theoretical study

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1404-8

Abstract:

• Possible formation pathways of H2S were revealed in thiophene pyrolysis.

Keywords： Density functional theory     Waste rubber     Thiophene     H2S     Pyrolysis    

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Experimental studies on extraction of cobalt ions from dilute aqueous solutions by using complexation-ultrafiltration

Jianxian ZENG, Junfeng LIU, Niandong HUANG,

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 3,   Pages 360-366 doi: 10.1007/s11705-009-0269-3

Abstract: The extraction of cobalt ions from dilute aqueous solutions was investigated by ultrafiltration with the help of poly(acrylic acid) sodium salt (PAASS). Polysulfone and polyethersulfone hollow fiber ultrafiltration membranes were employed in this process. The kinetics of complexation reaction was studied for PAASS with Co. Results showed that, under a large excess of PAASS, it takes 65, 55 and 40 min at pH 5, 6 and 7, respectively, to get the equilibrium of complexation. The reaction kinetics can be described by a pseudo-first-order equation. Then, the effects of various parameters on the extraction of Co were examined in detail. Results indicated that loading ratio, pH value and low-molecular competitive complexing agent affect significantly cobalt rejection coefficient . Furthermore, a concentration experiment was carried out at pH 7. With increasing volume concentration factor, membrane flux declines slowly, and value is always about 1. The concentrated retentate was used further for a decomplexation experiment. The decomplexation ratio of cobalt-PAASS complex reaches as high as 90.1%. After the decomplexation step, a diafiltration experiment was performed at pH 2.5. Cobalt ions can be extracted satisfactorily from the retentate, and a purified PAASS is obtained.
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Title Author Date Type Operation

Synthesis of mono and bis-4-methylpiperidiniummethyl-urea as corrosion inhibitors for steel in acidic media

Abbas TEIMOURI, Nasrin SOLTANI, Alireza Najafi CHERMAHINI

Journal Article

A review on different theoretical models of electrocaloric effect for refrigeration

Journal Article

Genome-wide association studies: inherent limitations and future challenges

Yan Du, Jiaxin Xie, Wenjun Chang, Yifang Han, Guangwen Cao

Journal Article

Genomic and pharmacogenetic studies of childhood acute lymphoblastic leukemia

Ching-Hon Pui

Journal Article

NOx removal by non-thermal plasma reduction: experimental and theoretical investigations

Journal Article

Thermal transport properties of monolayer phosphorene: a mini-review of theoretical studies

Guangzhao QIN, Ming HU

Journal Article

Prediction of the theoretical and semi-empirical model of ambient temperature

Foued CHABANE,Noureddine MOUMMI,Abdelhafid BRIMA,Abdelhafid MOUMMI

Journal Article

Theoretical and technological exploration of deep

Heping XIE, Yang JU, Shihua REN, Feng GAO, Jianzhong LIU, Yan ZHU

Journal Article

Theoretical analysis and experimental investigation of valveless piezoelectric pump with unsymmetrical

ZHANG Jianhui, LU Jizhuang, XIA Qixiao, LI Hong

Journal Article

Progress of Brain Network Studies on Anesthesia and Consciousness: Framework and Clinical Applications

Jun Liu, Kangli Dong, Yi Sun, Ioannis Kakkos, Fan Huang, Guozheng Wang, Peng Qi, Xing Chen, Delin Zhang, Anastasios Bezerianos, Yu Sun

Journal Article

Data quality assessment for studies investigating microplastics and nanoplastics in food products: Are

Journal Article

Technical studies on high-speed turnouts for china railways

He Huawu

Journal Article

ROUTE DEVELOPMENT, ANTIVIRAL STUDIES, FIELD EVALUATION AND TOXICITY OF AN ANTIVIRAL PLANT PROTECTANT

Journal Article

Mechanism insight into the formation of HS from thiophene pyrolysis: A theoretical study

Journal Article

Experimental studies on extraction of cobalt ions from dilute aqueous solutions by using complexation-ultrafiltration

Jianxian ZENG, Junfeng LIU, Niandong HUANG,

Journal Article