Quaternary Boundary Optimal Control Problem for Quaternary Nonlinear Elliptic System with Constraints by Alaa S. Khneab, Jamil Amir Al-hawasy, Ion Chryssoverghi

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The Family of Multiparameter Quaternary Subdivision Schemes by Ghulam Mustafa, Muhammad Asghar, Shafqat Ali, Arzoo Qamar, Jia-Bao Liu

“…In this paper, we propose a simple and generalized formula for a family of multiparameter quaternary subdivision schemes. The conditions for convergence of subdivision schemes are also presented. …”
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Development of Ternary and Quaternary Catalysts for the Electrooxidation of Glycerol by L. M. Artem, D. M. Santos, A. R. De Andrade, K. B. Kokoh, J. Ribeiro

“…The CV and CA data reveal that quaternary catalysts present the highest current density for the electrooxidation of glycerol.…”
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Laccase cataylzed synthesis of quaternary malononitriles with an aryl substituent by Parisa Amani, Mansour Shahedi, Elaheh Rezaei, Zohreh Habibi

“…Synthesis of quaternary malononitriles with an aryl substituent is of great importance because these scaffolds serve as essential intermediates in the synthesis of bioactive compounds. …”
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Quaternary Segmentation Characteristics of the Hunhe Fault, Northeast China by Bo Wan, Guanghao Ha, Xiaohui Zhao, Rui Suo

“…Some segments show evidence of late Quaternary activity, contradicting prior research that classified the Hunhe fault as an active fault during the MIS (Marine Isotope Stages) 20-103MIS 20-103- MIS6-19MIS6-19 period and assessed its seismic potential differently. …”
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Antimicrobial Polyethylene through Melt Compounding with Quaternary Ammonium Salts by Fernanda F. Rossetti, Konstantin Siegmann, Joachim Köser, Irene Wegner, Ismail Keskin, Götz Schlotterbeck, Martin Winkler

“…Contact angle measurements and fluorescein binding assays showed the presence of quaternary ammonium groups at the surface. After storing the samples in 50°C warm water for 30 days, several were still antimicrobially active. …”
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Quaternary tracking of the Basin changes (Case Study: Ghezel Ozan) by Hassan Jafari, Fatemeh Bakhtiyari

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Investigation of the effects and evidence of late Quaternary glaciers on the Binaloud Heights by Abolghasem Amir Ahmadi, Leila Goli Mokhtari, Naemi Tebar Mahnaz

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Fossil Tiger Beetles (Coleoptera: Cicindelidae): Review and New Quaternary Records by Christopher D. Nagano, Scott E. Miller, Alan V. Morgan

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The Influence of Interfering Substances on the Antimicrobial Activity of Selected Quaternary Ammonium Compounds by Paula A. Araújo, Madalena Lemos, Filipe Mergulhão, Luís Melo, Manuel Simões

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Naphthalene sorption on red clay and halloysite modified by quaternary ammonium salts by Agnieszka Gładysz-Płaska, Agnieszka Lipke, Bogdan Tarasiuk, Magdalena Makarska-Białokoz, Marek Majdan

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Preparation of quaternary ammonium-modified silica and its adsorption of vanadium(V) by ZHANG Cuihong, WANG Jing, WANG Jie, YUAN Wenjiao

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Study on the constructions of optimal almost quaternary sequences with period 2q by Xiuping PENG, Huipu JI, Deliang ZHENG, Xiaoxia NIU

Subjects: “…quaternary sequence…”
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Depositional record of metal(loid)s since late quaternary in the Laizhou Bay, China by Longlong Liu, Longlong Liu, Junfeng Gao, Shengjiang Zhang, Sen Lin, Dongdong Lu, Jialin Zhang, Xiang Xie, Bin Chen, Jiandong Qiu

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Elevated concentrations of quaternary ammonium compounds in childcare centers: A pilot study by Yao Cheng, Zhong Lv, Erika Schreder, Min Hu, Abby Mutic, Guomao Zheng, Amina Salamova

Subjects: “…Quaternary ammonium compounds (QACs)…”
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Adsorption of Organic Compounds on to Bentonites Modified with Single or Dual Quaternary Ammonium Cations by R. Gönülşen, N. Yıldız, A. Çalımlı

“…The adsorption of benzoic acid, hydroquinone and toluene on to bentonites modified with single or dual quaternary ammonium cations was studied. Thus, the mineral surface of the bentonite was modified by replacing the inorganic ions with four quaternary ammonium cations, i.e. tetramethylammonium (TMA), benzyltriethylammonium (BTEA), hexadecyltrimethylammonium (HDTMA) and octadecyltrimethylammonium (ODTMA). …”
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Plio–Quaternary Tectonic Activity in the Northern Nubian Belts: The Main Driving Forces by Enzo Mantovani, Marcello Viti, Daniele Babbucci, Caterina Tamburelli

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Synthesis and Interface Activity of a Series of Carboxylic Quaternary Ammonium Surfactants in Hydraulic Fracturing by Shixin Dai, Yufei Gong, Feng Wang, Pan Hu

“…To further explore the anion effect of quaternary ammonium cationic surfactants on their relative performances, four fatty acid surfactants were prepared (cetyltrimethylammonium acetate (CTAAC), cetyltrimethylammonium butyrate (CTABU), cetyltrimethylammonium hexanoate (CTAHE), and cetyltrimethylammonium caprylate (CTACA)). …”
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Quaternary Large Mammals from the Granada Geopark: A Magnificent Record with Examples of Geoconservation. by Alfonso Arribas Herrera, Guiomar Garrido Álvarez, José Antonio Garrido García, Francisco Juan García Tortosa, Cristobal Medialdea Pérez

Subjects: “…quaternary…”
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Competitive Removal of Perchlorate Ions by Quaternary Amine Modified Reed in the Presence of Nitrate and Phosphate by Salem Baidas, Khaled Al-Deyain, Xiaoguang Meng, Baoyu Gao

“…We report a kinetic and equilibrium study in which we examined the removal of perchlorate anions from water by adsorption onto modified reed (MR), an adsorption material constituted by giant reed (GR) particles whose anion adsorption properties have been enhanced by quaternary amine (QA) crosslinking. In particular, we examined how MR adsorption of perchlorate interacts competitively with concomitant adsorption of agriculture-derived phosphate and nitrate contaminants. …”
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