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Article ; Online: Sol-Gel Chemistry

Sébastien Clément / Ahmad Mehdi

Molecules, Vol 25, Iss 2538, p

From Molecule to Functional Materials

2020 Volume 2538

Abstract: Through this Special Issue, you will discover the potentiality of inorganic polymerization (sol-gel process) which is a unique and versatile way for the preparation of materials [.] ...

Abstract	Through this Special Issue, you will discover the potentiality of inorganic polymerization (sol-gel process) which is a unique and versatile way for the preparation of materials [.]
Keywords	sol-gel ; hydrolytic ; non-hydrolytic ; self-assembly ; catalysis ; titanium dioxide ; Organic chemistry ; QD241-441
Language	English
Publishing date	2020-05-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Hydrolytic vs. Nonhydrolytic Sol-Gel in Preparation of Mixed Oxide Silica–Alumina Catalysts for Esterification

Atheer Al Khudhair / Karim Bouchmella / Pierre Hubert Mutin / Vasile Hulea / Olinda Gimello / Ahmad Mehdi

Molecules, Vol 27, Iss 2534, p

2022 Volume 2534

Abstract: The development of green and sustainable materials for use as heterogeneous catalysts is a growing area of research in chemistry. In this paper, mesoporous SiO 2 -Al 2 O 3 mixed oxide catalysts with different Si/Al ratios were prepared via hydrolytic ( ... ...

Abstract	The development of green and sustainable materials for use as heterogeneous catalysts is a growing area of research in chemistry. In this paper, mesoporous SiO 2 -Al 2 O 3 mixed oxide catalysts with different Si/Al ratios were prepared via hydrolytic (HSG) and nonhydrolytic sol-gel (NHSG) processes. The HSG route was explored in acidic and basic media, while NHSG was investigated in the presence of diisopropylether as an oxygen donor. The obtained materials were characterized using EDX, N 2 -physisorption, powder XRD, 29 Si, 27 Al MAS-NMR, and NH 3 -TPD. This approach offered good control of composition and the Si/Al ratio was found to influence both the texture and the acidity of the mesoporous materials. According to 27 Al and 29 Si MAS NMR analyses, silicon and aluminum were more regularly distributed in NHSG samples that were also more acidic. Silica–alumina catalysts prepared via NHSG were more active in esterification of acetic acid with n-BuOH.
Keywords	sol-gel ; catalysis ; silica–alumina ; Organic chemistry ; QD241-441
Subject code	333
Language	English
Publishing date	2022-04-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The Explanation of the Requirements for the development of the Army Aviation doctrine in Hybrid warfare

AHMAD MEHDI JAMALI / Abdolali Poorshasp

علوم و فنون نظامی, Vol 13, Iss 40, Pp 53-

2017 Volume 76

Abstract: The change in the nature of the battles has necessitated a reassessment of the capabilities and weaknesses of the aggressor and the insider forces. The experience of the recent wars in the region shows that a kind of war has appeared with a particular ... ...

Abstract	The change in the nature of the battles has necessitated a reassessment of the capabilities and weaknesses of the aggressor and the insider forces. The experience of the recent wars in the region shows that a kind of war has appeared with a particular complexity, which involves the use of a combination of conventional and unconventional means to destabilize target countries. On the other hand, the use of military units, especially airborne units in the battlefield, requires preparation of various plans that are appropriate to future conditions, so before the war begins, much effort is needed to increase the combat readiness of these forces. In hybrid warfare situations, with regard to airborne capabilities, similar to these types of threats, the question arises: is there no need to develop the Army Aviation doctrine? In this paper, after examining recent hybrid wars and recognizing the airborne capabilities and geostrategic position of Iran, it was concluded that the need to develop the Army Aviation doctrine in hybrid wars was felt more than ever. In fact, this paper aimed to assess the need to develop the Army Aviation doctrine in hybrid warfare. This research is descriptive-analytical and finally, some suggestions are presented.
Keywords	the army aviation ; doctrine ; hybrid warfare ; Military Science ; U
Subject code	940
Language	English
Publishing date	2017-08-01T00:00:00Z
Publisher	AJA Command and Staff University
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Improvement of Air Assistance Performance at the Fourth Air Base of the Islamic Republic of Iran's Army using new methods (Optical and Thermometer) of search and rescue

Rahman Varzideh / Ahmad Mehdi Jamali / Faramarz Azizi

علوم و فنون نظامی, Vol 15, Iss 47, Pp 5-

2019 Volume 28

Abstract: The purpose of this research is to improve the performance of search and rescue operations in order to improve airborne assistance at the 4th Air Base of the Army of the Islamic Republic of Iran. Therefore, it is purposeful, applied and in terms of type, ...

Abstract	The purpose of this research is to improve the performance of search and rescue operations in order to improve airborne assistance at the 4th Air Base of the Army of the Islamic Republic of Iran. Therefore, it is purposeful, applied and in terms of type, method and descriptive nature / case. The statistical population includes all the pilots and the Rescue Team of the 4th Airborne Army of the Islamic Republic of Iran, with 30 people (in total). Interviews, questionnaires and library studies were used as a tool for data collection. The findings of the research confirm that the use of different methods of search and rescue and the equipping of helicopters with new equipment will have a significant impact on improving the performance of airborne assistance at this base. The results of the quantitative analysis indicate that 76% of the sample population believe that each of the indicators of the use of optic and thermometric methods to improve the performance of aids in the 4th Air Base of the Army of the Islamic Republic of Iran Iran are effective. The results of this study indicate that in order to improve the performance of the 4th Air Force Base Airborne Aid in the direction of the search and rescue, the rescue helicopters should be equipped with optical and thermometer cameras and, which the way of use will be at the end of the article.
Keywords	army aviation ; airborne assistance ; search and rescue ; optical and thermometer ; Military Science ; U
Subject code	290
Language	English
Publishing date	2019-05-01T00:00:00Z
Publisher	AJA Command and Staff University
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Solid–Liquid Europium Ion Extraction via Phosphonic Acid-Functionalized Polyvinylidene Fluoride Siloxanes

Mohammad Wehbi / Ahmad Mehdi / Ali Alaaeddine / Nada Jaber / Bruno Ameduri

Polymers, Vol 12, Iss 1955, p

2020 Volume 1955

Abstract: Novel triethoxysilane and dimethyl phosphonate functional vinylidene fluoride (VDF)-containing terpolymers, for potential applications in Eu ion extraction from water, were produced by conventional radical terpolymerization of VDF with ... ...

Abstract	Novel triethoxysilane and dimethyl phosphonate functional vinylidene fluoride (VDF)-containing terpolymers, for potential applications in Eu ion extraction from water, were produced by conventional radical terpolymerization of VDF with vinyltriethoxylsilane (VTEOS) and vinyldimethylphosphonate (VDMP). Although initial attempts for the copolymerization of VTEOS and VDMP failed, the successful terpolymerization was initiated by peroxide to lead to multiple poly(VDF- ter -VDMP- ter -VTEOS) terpolymers, that had different molar percentages of VDF (70–90 mol.%), VTEOS (5–20 mol.%) and VDMP (10 mol.%) in 50–80% yields. The obtained terpolymers were characterized by 1 H, 19 F, 29 Si and 31 P NMR spectroscopies. The crosslinking of such resulting poly(VDF- ter -VDMP- ter -VTEOS) terpolymers was achieved by hydrolysis and condensation (sol–gel process) of the triethoxysilane groups in acidic media, to obtain a 3D network, which was analyzed by solid state 29 Si and 31 P NMR spectroscopies, TGA and DSC. The thermal stability of the terpolymers was moderately high (up to 300 °C under air), whereas they display a slight increase in their crystallinity-rate from 9.7% to 12.1% after crosslinking. Finally, the dimethyl phosphonate functions were hydrolyzed into phosphonic acid successfully, and the europium ion extraction capacity of terpolymer was studied. The results demonstrated a very high removal capacity of Eu(III) ions from water, up to a total removal at low concentrations.
Keywords	radical copolymerization ; fluoropolymers ; europium extraction ; sol–gel ; phosphonates ; Organic chemistry ; QD241-441
Subject code	333
Language	English
Publishing date	2020-08-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Hawarirooz and defending the invasion of Ba'athist enemy in the second year of war

Yousof Bakhtiari / hammid hassanpoor / AHMAD MEHDI JAMALI

علوم و فنون نظامی, Vol 14, Iss 44, Pp 51-

2018 Volume 68

Abstract: The Islamic Republic of Iran's Army aviation, according to its capabilities in supporting fire, heliborn, reconnaissance and evacuating the injured personnel was ready from the beginning to the end of the war in offensive and defensive operations, ... ...

Abstract	The Islamic Republic of Iran's Army aviation, according to its capabilities in supporting fire, heliborn, reconnaissance and evacuating the injured personnel was ready from the beginning to the end of the war in offensive and defensive operations, including the military strategy of the Islamic Republic of Iran to expel the enemy and repel the enemy's invasion ofenemy played a more effective role in the second year of the imposed war. Therefore, it is necessary to examine the experiences and performance of this unit and its staff in the context of the above dimensions, and its role in defeating and repelling the enemy's aggression. The general purpose of this paper is to explain the army aviation's performance in the areas of fire support, heliborn the forces, aerial reconnaissance and evacuation of the injured in the second year of the war. The results showed that the Iranian army aviation in the area of fire support of offensive and defensive units in the southern operations and in the area of the heliborn forces and transportation of ammunition and logistics in the operational areas of the west and northwest as well as the evacuation of injured and martyrs in the south and northwest and Also, in the field of aerial reconnaissance in operational areas of the south and northwest of the country, and played the effective role in the victories of the second year of the imposed war. Key words: army aviation, IRIA, Disposal of Aggression, Second Year of War
Keywords	key words : "army aviation" ; "iria" ; "disposal of aggression" ; "second year of war" ; Military Science ; U
Subject code	940
Language	English
Publishing date	2018-08-01T00:00:00Z
Publisher	AJA Command and Staff University
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: How to AH1 helicopter support in hybrid warfare

Majeed Rajabpour / AHMAD MEHDI JAMALI / Mohammad ebrahim Khalili

علوم و فنون نظامی, Vol 14, Iss 43, Pp 97-

2018 Volume 128

Abstract: Abstract: In the present study how to support of Cobra in the hybrid war. The variables influencing the research consists of update 3 class Logistics and update 5 class Logistics and maintenance. According to the nature of the research subject, this ... ...

Abstract	Abstract: In the present study how to support of Cobra in the hybrid war. The variables influencing the research consists of update 3 class Logistics and update 5 class Logistics and maintenance. According to the nature of the research subject, this research hs applied and its method is consistent with the descriptive method, for the analysis of data from the analysis of images is necessary to take advantage. To the this research, data collection and field tow ways a library using the tools of the study documents, interviews with experts and taken the self qustionnaire. Considering that the size of statistical community with equal 150 people(N=150), so by using the formula sample size, the Cochrane communtity was calculated(n=78), validity of questionnaire using the method halve, 89% was caculated. Test research on the heveh of error assume 5 persent, shows that between the individual influencing variables with the support of Cobra helicpter, there is a direct relationship. At end of the investigation, the researcher applied the suggestion regarding how support of the Cobra in the hybrid war has been described as effective combhnation.
Keywords	aviation ; support ; update 3 class logistics ; update 5 class logistics ; maintenance ; hybrid war ; Military Science ; U
Subject code	380
Language	English
Publishing date	2018-05-01T00:00:00Z
Publisher	AJA Command and Staff University
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Europium-Doped Sol-Gel SiO2-Based Glasses

Hussein Fneich / Nathalie Gaumer / Stéphane Chaussedent / Wilfried Blanc / Ahmad Mehdi

Molecules, Vol 23, Iss 7, p

Effect of the Europium Source and Content, Magnesium Addition and Thermal Treatment on Their Photoluminescence Properties

2018 Volume 1768

Abstract: Rare-earth doped silica-based glasses lead the optical materials due to their tailorable spectroscopic and optical properties. In this context, we took advantage of the sol-gel process to prepare various Eu-doped silica glasses to study their luminescent ...

Abstract	Rare-earth doped silica-based glasses lead the optical materials due to their tailorable spectroscopic and optical properties. In this context, we took advantage of the sol-gel process to prepare various Eu-doped silica glasses to study their luminescent properties before and after annealing at 900 °C. The effect of magnesium on these properties was studied in comparison with Mg-free-glass. Using TEM, nitrogen sorption, XRD and FT-IR, we confirmed that the magnesium modifies the glass structure and the thermal treatment eliminates the aqueous environment, modifying the structure ordering. The emission spectra and the decay time curves show the advantages of the Mg addition and the annealing on the photoluminescent properties.
Keywords	luminescent materials ; sol-gel ; silica ; europium ; magnesium ; photoluminescence ; Organic chemistry ; QD241-441
Subject code	620
Language	English
Publishing date	2018-07-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A Collagen-Mimetic Organic-Inorganic Hydrogel for Cartilage Engineering

Laurine Valot / Marie Maumus / Luc Brunel / Jean Martinez / Muriel Amblard / Danièle Noël / Ahmad Mehdi / Gilles Subra

Gels, Vol 7, Iss 73, p

2021 Volume 73

Abstract: Promising strategies for cartilage regeneration rely on the encapsulation of mesenchymal stromal cells (MSCs) in a hydrogel followed by an injection into the injured joint. Preclinical and clinical data using MSCs embedded in a collagen gel have ... ...

Abstract	Promising strategies for cartilage regeneration rely on the encapsulation of mesenchymal stromal cells (MSCs) in a hydrogel followed by an injection into the injured joint. Preclinical and clinical data using MSCs embedded in a collagen gel have demonstrated improvements in patients with focal lesions and osteoarthritis. However, an improvement is often observed in the short or medium term due to the loss of the chondrocyte capacity to produce the correct extracellular matrix and to respond to mechanical stimulation. Developing novel biomimetic materials with better chondroconductive and mechanical properties is still a challenge for cartilage engineering. Herein, we have designed a biomimetic chemical hydrogel based on silylated collagen-mimetic synthetic peptides having the ability to encapsulate MSCs using a biorthogonal sol-gel cross-linking reaction. By tuning the hydrogel composition using both mono- and bi-functional peptides, we succeeded in improving its mechanical properties, yielding a more elastic scaffold and achieving the survival of embedded MSCs for 21 days as well as the up-regulation of chondrocyte markers. This biomimetic long-standing hybrid hydrogel is of interest as a synthetic and modular scaffold for cartilage tissue engineering.
Keywords	hydrogel ; sol-gel ; hybrid material ; collagen-mimetic peptide ; cartilage tissue engineering ; mesenchymal stromal cells ; Science ; Q ; Chemistry ; QD1-999 ; Inorganic chemistry ; QD146-197 ; General. Including alchemy ; QD1-65
Subject code	620
Language	English
Publishing date	2021-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A bioinspired approach for the modulation of electroosmotic flow and protein-surface interactions in capillary electrophoresis using silylated amino-amides blocks and covalent grafting.

Gouyon, Jérémie / Clavié, Margaux / Raquel, Gutiérrez-Climente / Ngo, Giang / Dumy, Pascal / Etienne, Pascal / Martineau, Pierre / Pugnière, Martine / Ahmad, Mehdi / Subra, Gilles / Perrin, Catherine / Ladner, Yoann

Electrophoresis

2023 Volume 45, Issue 5-6, Page(s) 557–572

Abstract: We explore a bioinspired approach to design tailored functionalized capillary electrophoresis (CE) surfaces based on covalent grafting for biomolecules analysis. First, the approach aims to overcome well-known common obstacles in CE protein analysis ... ...

Abstract	We explore a bioinspired approach to design tailored functionalized capillary electrophoresis (CE) surfaces based on covalent grafting for biomolecules analysis. First, the approach aims to overcome well-known common obstacles in CE protein analysis affecting considerably the CE performance (asymmetry, resolution, and repeatability) such as the unspecific adsorption on fused silica surface and the lack of control of electroosmotic flow (EOF). Then, our approach, which relies on new amino-amide mimic hybrid precursors synthesized by silylation of amino-amides (Si-AA) derivatives with 3-isocyanatopropyltriethoxysilane, aims to recapitulate the diversity of protein-protein interactions (π-π stacking, ionic, Van der Waals…) found in physiological condition (bioinspired approach) to improve the performance of CE protein analysis (electrochromatography). As a proof of concept, these silylated Si-AA (tyrosinamide silylation, serinamide silylation, argininamide silylation, leucinamide silylation, and isoglutamine silylation acid) have been covalently grafted in physiological conditions in different amount on bare fused silica capillary giving rise to a biomimetic coating and allowing both the modulation of EOF and protein-surface interactions. The analytical performances of amino-amide functionalized capillaries were assessed using lysozyme, cytochrome C and ribonuclease A and compared to traditional capillary coatings poly(ethylene oxide), poly(diallyldimethylammonium chloride), and sodium poly(styrenesulfonate). EOF, protein adsorption rate, protein retention factor k, and selectivity were determined for each coating. All results obtained showed this approach allowed to modulate the EOF, reduce unspecific adsorption, and generate specific interactions with proteins by varying the nature and the amount of Si-AA in the functionalization mixture.
MeSH term(s)	Electroosmosis ; Amides ; Electrophoresis, Capillary/methods ; Polyethylene Glycols/chemistry ; Proteins ; Silicon Dioxide/chemistry
Chemical Substances	Amides ; Polyethylene Glycols (3WJQ0SDW1A) ; Proteins ; Silicon Dioxide (7631-86-9)
Language	English
Publishing date	2023-12-31
Publishing country	Germany
Document type	Journal Article
ZDB-ID	619001-7
ISSN	1522-2683 ; 0173-0835
ISSN (online)	1522-2683
ISSN	0173-0835
DOI	10.1002/elps.202300168
Database	MEDical Literature Analysis and Retrieval System OnLINE

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