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Artykuły w czasopismach na temat „Chemical bonds research”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 21 lutego 2023

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1

Liu, Runzhan, Guoyong Mao, and Ning Zhang. "Research of chemical elements and chemical bonds from the view of complex network." Foundations of Chemistry 21, no. 2 (June 11, 2018): 193–206. http://dx.doi.org/10.1007/s10698-018-9318-7.

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Morawetz, Herbert. "History of Rubber Research." Rubber Chemistry and Technology 73, no. 3 (July 1, 2000): 405–26. http://dx.doi.org/10.5254/1.3547599.

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Abstract After the discovery of the tapping of Hevea rubber trees in the middle of the eighteenth century and early technological applications of Hevea rubber, efforts to discover the chemical nature of rubber started with the determination of its elemental composition in 1826. Later it was shown that rubber pyrolysis yields low molecular weight chemicals with the identical elemental composition. It was long believed that these add to each other by “secondary valence bonds.” However Staudinger's work starting in 1920 proved that Hevea (H.) rubber consists of chains linked by covalent bonds. Th

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Li, Pei Yi, Mei Yun Zhang, Zhi Jie Wang, and Chun Tao Lin. "A Research on Modification of Paper-Based Functional Polyurethane Material." Advanced Materials Research 311-313 (August 2011): 1186–89. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.1186.

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The methods of synthesizing polyurethane (Isophorone diisocyanate IPDI) with paper were investigated. The combination of SEM and IR analysis were used to analyze the chemical and physical characteristics and forming mechanism of the polyurethane derived from paper. The physical of base-paper material improved remarkably on the conditions of dosage of IPD 12%, reaction time 10min and temperature 60°C, facture length elevated by54.4%, folding strength raised by 12.4 times, and wet strength / dry strength was 50.54%.It was found that carbonate bond was formed between IPDI with cellulose in fibers

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Abed, Heba F., Waad H. Abuwatfa, and Ghaleb A. Husseini. "Redox-Responsive Drug Delivery Systems: A Chemical Perspective." Nanomaterials 12, no. 18 (September 14, 2022): 3183. http://dx.doi.org/10.3390/nano12183183.

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With the widespread global impact of cancer on humans and the extensive side effects associated with current cancer treatments, a novel, effective, and safe treatment is needed. Redox-responsive drug delivery systems (DDSs) have emerged as a potential cancer treatment with minimal side effects and enhanced site-specific targeted delivery. This paper explores the physiological and biochemical nature of tumors that allow for redox-responsive drug delivery systems and reviews recent advances in the chemical composition and design of such systems. The five main redox-responsive chemical entities t

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Wu, Shao Gui, Ya Ru Fan, and Jun Zhou. "Research Progress on Preparation Methods of PMIA Fiber." Advanced Materials Research 463-464 (February 2012): 769–72. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.769.

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PMIA is a functional fiber with superior heat-resistance, flame resistance, high temperature dimensional stability and electrical insulation. In PMIA crystal structure, there exist hydrogen bonds between two planes in the crystal and they are arranged in grid. The strong interactions between hydrogen bonds result in a very stable chemical structure of PMIA. Owing to lower internal rotation potential energy than PPTA, PMIA molecular chains are flexible structures and its elastic modulus is in the same level as other flexible macromolecules. In this paper, the structure character of molecular ch

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Santoso, Agus Muji, Bayu Guruh Binangkit, Mohamad Amin, Sutiman Bambang Sumitro, Betty Lukiati, Mumun Nurmilawati, Poppy Rahmatika Primandiri, Ida Rahmawati, S. Sulistiono, and Yayoi Kodama. "Anticancer mechanism of Pisangulin angulata through in silico and development as teaching material." Biosfer 12, no. 1 (April 29, 2019): 45–57. http://dx.doi.org/10.21009/biosferjpb.v12n1.45-57.

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This study aims to reveal the anticancer mechanism of the bioactive compound of Pisangulin angulata and to assess the feasibility of that results as teaching material. This research includes descriptive explorations. In the first stage, an in silico analysis was performed by molecular docking method between physalin compounds and GLI1 protein. The second steps of this study aim to develop teaching materials based research using the Analysis, Reorganizing, Piloting Class, and Evaluating (ARPE models). Feasibility test was carried out by experts and practitioners. Think Pair Share was used in th

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Yang, Dong Bo, Xing Kai Meng, Xia Zhang, and Jing Jing Tian. "Research on the Correlation between Biodiesel's Composition and Physical & Chemical Properties." Applied Mechanics and Materials 737 (March 2015): 65–70. http://dx.doi.org/10.4028/www.scientific.net/amm.737.65.

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Biodiesel's composition has a significant effect on biodiesel’s main physical and chemical properties. Through the test and analysis of the composition and the physical & chemical properties of 5 types of biodiesel, this paper uses linear regression model and least square method to conduct a research on the correlation between biodiesel's physical and chemical properties such as density, cold filter plugging point (CFPP), cetane number and kinematic viscosity, biodiesel's FAME content and the number of double bonds in its UFAME, and establishes correlation functions for relevant indexes, p

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Sari, Novieta, Suandi Sidauruk, Ruli Meiliawati, and Anggi Ristiyana Puspita Sari. "The Difficulties of X Grade High School Students in Palangka Raya City Academic Year of 2018/2019 in Understanding Chemical Bond Concept using Two-Tier Multiple Choice." GAMAPROIONUKLEUS 1, no. 2 (November 30, 2020): 135–48. http://dx.doi.org/10.37304/jpmipa.v1i2.3686.

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The concept of chemical bonds is one of the concepts that students are less familiar with, so there is a need for a diagnostic test to determine students' difficulty. This study aims to describe students' difficulties in understanding the concept of chemical bonds using two-tier multiple-choice which includes the following sub: (1) stable electron configuration, (2) valence electrons, (3) ionic bonds, (4) covalent bonds, and (5) metal bonds. The subjects of this study were students of class X MIA from SMA Negeri 1 Palangka Raya, SMA Negeri 3 Palangka Raya, and SMA Negeri 4 Palangka Raya with a

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Pumera, Martin, and Zdeněk Sofer. "Towards stoichiometric analogues of graphene: graphane, fluorographene, graphol, graphene acid and others." Chemical Society Reviews 46, no. 15 (2017): 4450–63. http://dx.doi.org/10.1039/c7cs00215g.

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Inaltekin, Tufan, Hakan Akcay, and Mehmet Kürşat Duru. "Examination of Pre-Service Science Teachers' Model Based-Content Knowledge and Knowledge of Students’ Understanding on Chemical Bonds." International Journal of Research in Education and Science 9, no. 1 (February 13, 2023): 17–54. http://dx.doi.org/10.46328/ijres.3084.

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This study aims to examine pre-service science teachers' (PSTs') model-based (MB) content knowledge (CK) and knowledge of students' understanding (KSU) of chemical bonds. The participants of the study consist of 229 senior pre service science teachers. The study is a case study from qualitative research designs. The data of the study were collected by using the "Chemical Bonds Model Knowledge Test (CBMKT)". The obtained data were analyzed using the "Model Based-Content Knowledge Rubric (MB-CK Rubric)" and "Model Based-Knowledge of Students' Understanding Rubric (MB-KSU Rubric)". The findings s

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Jusli, Euniza, Hasanan M. Nor, Ramadhansyah Putra Jaya, and Haron Zaiton. "Chemical Properties of Waste Tyre Rubber Granules." Advanced Materials Research 911 (March 2014): 77–81. http://dx.doi.org/10.4028/www.scientific.net/amr.911.77.

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This research aims to examine the chemical properties of waste rubber tyre granules. Rubber granules were analysed by using X-ray fluorescence to establish its chemical composition. Thermogravimetry and differential thermogravimetric analyses were performed to investigate the relationship between temperature and the minerological compositions of rubber granules to determine its suitability as an aggregate replacement in concrete mix. Fourier Transform Infra-Red (FTIR) indicated that due to the stability of the structures developed in OPC samples, the reactions between the structure bonds are l

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12

MOHAJERI, A., and P. DASMEH. "EVALUATING THE NATURE OF CHEMICAL BONDS BASED ON PROBABILISTIC MODELS." International Journal of Modern Physics C 18, no. 11 (November 2007): 1795–809. http://dx.doi.org/10.1142/s0129183107011753.

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A theoretical measure of the ionicity based on different mathematical concepts is presented in this research. Considering the distribution of valence electrons on each atom in a bond, we assume that the chemical properties of the atom can be expressed by means of probability. Using the introduced probability, different probabilistic models such as classical, fuzzy and information theoretical models have been employed to introduce new descriptors of bond ionicity. The ionicities were calculated for 12 heterodiatomic molecules and the bonds were classified in terms of covalency vs. ionicity. It

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Hafis, Muhammad, and Ahmad Afif Supianto. "Mobile Game Design for Learning Chemical Bonds with Endless Run Approach." International Journal of Interactive Mobile Technologies (iJIM) 12, no. 8 (December 24, 2018): 104. http://dx.doi.org/10.3991/ijim.v12i8.9260.

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This research focuses on the design of a mobile application game that uses endless run method to learn chemistry concept of chemical bonds, its design is analyzed thoroughly. Application-based learning is one of the method of learning that has been proven to be effective, however, previous studies focuses on the elements of serious gaming that neglects the fun elements in the game itself, disdaining the nature of a game. This research aims to discover the relevance of player happiness and fun level based when playing an educational game and its correlation with the level of learning while also

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14

BOGDANOVA, Ekaterina V., Elena I. MELNIKOVA, and Irina B. KOSHEVAROVA. "THE RESEARCH OF THE TYPES OF MOISTURE BONDS IN PROTEIN-CARBOHYDRATE CONCENTRATES OF CHEESE WHEY." Periódico Tchê Química 17, no. 34 (March 20, 2020): 33–44. http://dx.doi.org/10.52571/ptq.v17.n34.2020.51_p34_pgs_33_44.pdf.

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The purpose of the research is to improve the technology of producing cheese whey proteincarbohydrate concentrates, in terms of binding moisture with the main components. Objects of the research were natural cheese whey obtained in the production of Rossiyskii cheese and ultrafiltration cheese whey concentrates with protein dry matter percentage of 35 and 55%, produced with the use of MMS Swissflow UF industrial ultrafiltration unit with ceramic membranes. The chemical composition and Physico-chemical properties of raw materials and the finished product have been studied using standard methods

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15

Kristyasari, Marantika Lia, Henie Poerwandar Asmaningrum, and Rizka Fauzia Hanif. "Wright-Map to Analyze Students’ Abilities on Chemical Bond Test." SHS Web of Conferences 149 (2022): 01050. http://dx.doi.org/10.1051/shsconf/202214901050.

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The implementation of the evaluation of learning outcomes for students allows the emergence of biases that can cause students' abilities to not be depicted properly. This study aims to determine the ability of students based on the evaluation test of chemistry learning in high school. The research subjects involved 41 students. Data analysis using Wright Map on Rasch modelling based on chemical bond indicators such as 1) the process of forming ionic and covalent bonds, 2) differences in ionic and covalent bonds from physical and chemical properties, 3) analyzing the type of chemical bonds form

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Dewi, Akmalia Mutiara, and Agus Kamaludin. "Development of Audiovisual-Based PowToon Animation Video on Chemical Bonds for Tenth Grade." Jurnal Penelitian Pendidikan IPA 8, no. 1 (January 14, 2022): 222–29. http://dx.doi.org/10.29303/jppipa.v8i1.865.

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This research aimed to develop an audiovisual-based PowToon animation video on the subject matter of chemical bonds and analyze the quality of the audiovisual-based animated video as learning media to study chemical bonds based on the assessment of material experts, media experts, chemistry teachers, and students’ responses. This research used development research methods (R&D) with a 4D development model (Define, Design, Development, and Dissemination). However, the 4D development model was limited to the dissemination stage in this research. The product is an animated video, which is in

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17

Anugrah, Daru Seto Bagus, Laura Virdy Darmalim, Muhammad Rifky Irwanto Polanen, Permono Adi Putro, Nurwarrohman Andre Sasongko, Parsaoran Siahaan, and Zeno Rizqi Ramadhan. "Quantum Chemical Calculation for Intermolecular Interactions of Alginate Dimer-Water Molecules." Gels 8, no. 11 (October 31, 2022): 703. http://dx.doi.org/10.3390/gels8110703.

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The abundance of applications of alginates in aqueous surroundings created by their interactions with water is a fascinating area of research. In this paper, computational analysis was used to evaluate the conformation, hydrogen bond network, and stabilities for putative intermolecular interactions between alginate dimers and water molecules. Two structural forms of alginate (alginic acid, alg, and sodium alginate, SA) were evaluated for their interactions with water molecules. The density functional theory (DFT-D3) method at the B3LYP functional and the basis set 6-31++G** was chosen for calc

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Ma, Yin, Qing Shan Li, You Bo Di, and Min Zhang. "Research on Superfine Wool Surface Texture Modified in Biochemistry." Advanced Materials Research 96 (January 2010): 189–96. http://dx.doi.org/10.4028/www.scientific.net/amr.96.189.

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Superfine wool surface texture changed after the processing with biochemistry technology. Its fiber thinness and friction effect reduce, the itchy feeling caused by wool is rid of, and the contraction of carpets diminishes so that it lives up to the standard of machine washing and anti-pilling. Meanwhile, the chemical groups of fiber surface of the superfine wool changes as well, which produces a material of which the physical and chemical structure of the surface differs from the nano-interface of the original fiber. If supplemented by functional stuff and combined in the form of chemical bon

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Yoqubov, Bekhzod B., Akhmadjon Ibadullaev, Dilnora Q. Yoqubova, and Elmira U. Teshabaeva. "Prospects and Development of Research of Composite Elastomer Materials." Journal of Siberian Federal University. Chemistry 14, no. 4 (December 2021): 464–76. http://dx.doi.org/10.17516/1998-2836-0255.

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The aim of this work is to study the effect of new modified ingredients on the complex of properties of composite elastomeric materials. It was found that the introduction of modified ingredients into the composition of elastomeric compositions enhances interfacial interaction at the «rubber-filler» interface and the formation of additional bonds between rubber macromolecules and functional groups, as a result of which an improvement in the complex of properties of the compositions is observed. The introduction of modified carbon into the composition of elastomeric compositions enhances interf

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Shabani, Amin, Xavier Colin, Gregory Marque, and Carole Monchy-Leroy. "PEROXIDE CROSS-LINKING OF EPDMs HAVING HIGH FRACTIONS OF ETHYLENIC UNITS." Rubber Chemistry and Technology 87, no. 4 (December 1, 2014): 679–702. http://dx.doi.org/10.5254/rct.14.85989.

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ABSTRACT The considerable amount of research in the literature has practically allowed the elucidation of the mechanism of peroxide cross-linking of ethylene–propylene–diene–monomer rubber (EPDM), which occurs through a radical chain reaction initiated by the thermal decomposition of the peroxide molecule. According to this radical chain reaction, all types of labile hydrocarbon bonds (i.e., allylic, methynic, and methylenic CH bonds) would be exposed to alkoxy radicals and involved in the formation of the elastomeric network. However, for high fractions of ethylenic units (typically ≥60 mol.%

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Rohmah, Rosyidah Syafaatur, Nikmatin Sholichah, Yunilia Nur Pratiwi, and Rizki Nur Analita. "Analysis of Students’ Chemical Bonding Misconception with A Four-Tier Diagnostic Test." JTK (Jurnal Tadris Kimiya) 7, no. 2 (December 31, 2022): 166–74. http://dx.doi.org/10.15575/jtk.v7i2.20343.

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Students had difficulty understanding the chemical bonding concept because of its complex and abstract nature. This difficulty could lead to chemical bonding misconceptions. This study aimed to investigate basic chemistry students' misconceptions of chemical bonding. This study used a descriptive research design with a four-tier diagnostic test. The research’s subjects were basic chemistry students. Chemical Bonding Diagnostic Tool (CBDT) was used as an instrument to determine students' misconceptions. The results showed that students who had misconceptions about ionic, covalent, and coordinat

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Fawcett, Alexander. "Advances in the catalyst- and reagent-controlled site-divergent intermolecular functionalization of C(sp3)–H bonds." Pure and Applied Chemistry 92, no. 12 (December 16, 2020): 1987–2003. http://dx.doi.org/10.1515/pac-2020-0803.

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AbstractIntermolecular C(sp3)–H bond functionalization reactions promise to revolutionize how we synthesize organic molecules by enabling the introduction of functionality at previously inert sites. However, one of the greatest challenges in this research field is site-selectivity, wherein chosen C(sp3)–H bonds must be selectively functionalized and other C(sp3)–H bonds with similar stereoelectronic properties must remain intact. To address this problem, chemists have developed methods that rely on targeting innately more reactive C(sp3)–H bonds or on using pre-installed functional groups to d

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Liu, Qi Feng. "Research on Treatment of the Micro-Polluted Reservoir Water with Ozone Oxidation." Advanced Materials Research 884-885 (January 2014): 129–33. http://dx.doi.org/10.4028/www.scientific.net/amr.884-885.129.

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Bench and pilot scale pre-oxidation treatment runs were performed on the raw water samples from micro-polluted reservoir. Bench experimental results showed that the particles with large size decreased when ozone pre-oxidation was applied, meanwhile, the organic matters with unsaturated chemical bonds decreased obviously. Pilot experimental results showed that turbidity, UV254,CODMn and total coliform could be treated efficiently by ozone pre-oxidation combined with traditional technologies, but the effectiveness of DOC removal is not obvious. Keywords: ozone oxidation; UV254; Organic matter; m

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Ma, Rongqing, Hongfan Hu, Xinle Li, Guoliang Mao, Yuming Song, and Shixuan Xin. "Advances in Catalytic C–F Bond Activation and Transformation of Aromatic Fluorides." Catalysts 12, no. 12 (December 18, 2022): 1665. http://dx.doi.org/10.3390/catal12121665.

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The activation and transformation of C–F bonds in fluoro-aromatics is a highly desirable process in organic chemistry. It provides synthetic methods/protocols for the generation of organic compounds possessing single or multiple C–F bonds, and effective catalytic systems for further study of the activation mode of inert chemical bonds. Due to the high polarity of the C–F bond and it having the highest bond energy in organics, C–F activation often faces considerable academic challenges. In this mini-review, the important research achievements in the activation and transformation of aromatic C–F

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Zhao, Zhuo, Fang Fang, Junsheng Wu, Xinru Tong, Yanwen Zhou, Zhe Lv, Jian Wang, and David Sawtell. "Interfacial Chemical Effects of Amorphous Zinc Oxide/Graphene." Materials 14, no. 10 (May 11, 2021): 2481. http://dx.doi.org/10.3390/ma14102481.

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Research on the preparation and performance of graphene composite materials has become a hotspot due to the excellent electrical and mechanical properties of graphene. Among such composite materials, zinc oxide/graphene (ZnO/graphene) composite films are an active research topic. Therefore, in this study, we used the vacuum thermal evaporation technique at different evaporation voltages to fabricate an amorphous ZnO/graphene composite film on a flexible polyethylene terephthalate (PET). The amorphous ZnO/graphene composite film inherited the great transparency of the graphene within the visibl

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Czepułkowska, W., E. Wołowiec-Korecka, and L. Klimek. "The role of mechanical, chemical and physical bonds in metal-ceramic bond strength." Archives of Materials Science and Engineering 1, no. 92 (July 1, 2018): 5–14. http://dx.doi.org/10.5604/01.3001.0012.5506.

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Purpose: A review regarding the mechanisms of metal-ceramic join is presented. Design/methodology/approach: The impact of the air-abrasion parameters on the mechanical bond strength of the ceramic crowns was discussed. The presence of opaque on the chemical bond was analysed. Research of the influence of the difference in the coefficient of thermal expansion values on the metal-ceramic bond was included. The methods of testing the bond strength were analysed. Findings: The metal substructure-dental ceramic bond strength is affected by all types of bond. In bond strength, 3-point bending test a

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Leal, Wilmer, and Guillermo Restrepo. "Formal structure of periodic system of elements." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475, no. 2224 (April 2019): 20180581. http://dx.doi.org/10.1098/rspa.2018.0581.

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For more than 150 years, the structure of the periodic system of the chemical elements has intensively motivated research in different areas of chemistry and physics. However, there is still no unified picture of what a periodic system is. Herein, based on the relations of order and similarity, we report a formal mathematical structure for the periodic system, which corresponds to an ordered hypergraph. It is shown that the current periodic system of chemical elements is an instance of the general structure. The definition is used to devise a tailored periodic system of polarizability of singl

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Barsky, Vadim, Vitaly Gulyaev, and Andriy Rudnitsky. "Composition and Structure of Coal Organic Mass. Analytical Review." Chemistry & Chemical Technology 3, no. 4 (December 15, 2009): 315–19. http://dx.doi.org/10.23939/chcht03.04.315.

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The research works dedicated to the formation regularities of solid fuels chemical structure were analyzed. Modern conceptions of coals chemical structure, which are becoming deeper owing to tooling growth and facts accumulation, were examined by means of critical comparison of different hypothetical models of solid fuels “molecular” structure. The most general points of the respective theories were formulated, according to which “soft” influence on coal structure primary elements bonds system allows bringing its chemical potential to the maximum.

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Thanh, Le Tat. "RESEARCH OF CHEMICAL COMPONENTS OF SOME SEAWEED SPECIES IN CON CO ISLAND – QUANG TRI PROVINCE." Vietnam Journal of Science and Technology 54, no. 2C (March 19, 2018): 493. http://dx.doi.org/10.15625/2525-2518/54/2c/11879.

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11 samples of 8 seaweed families were collected at Con Co – Quang Tri and determined ofthe chemical compositions. The analysis results showed that these seaweed samples in Con Cocontain high content of trace elements and low content of heavy metals. Many samples havegood lipid quality to meet the requirements of safe food, as well as being good for the humanhealth (such as CC1, N9, N4, and N6 samples). Especially, some seaweed samples were foundto contain long-chain fatty acids with many double bonds presenting high bioactivity in theirlipid composition, such as C20: 4n-6 (AA) up to 22.35% (Hy

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Ghahri, Saman, Xinyi Chen, Antonio Pizzi, Reza Hajihassani, and Antonios N. Papadopoulos. "Natural Tannins as New Cross-Linking Materials for Soy-Based Adhesives." Polymers 13, no. 4 (February 16, 2021): 595. http://dx.doi.org/10.3390/polym13040595.

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Human health problems and formaldehyde emission from wood-based composites are some of the major drawbacks of the traditional synthetic adhesives such as urea formaldehyde resins. There have been many attempts to decrease formaldehyde emission and replace urea formaldehyde resins with bio-based adhesives for wood-based composites. Because of some weakness in soy-based adhesive, chemicals have been used as modifiers. Modified soy-based adhesives without any formaldehyde have been successfully used to prepare wood panels. To achieve this, different synthetic cross-linking chemicals such as pheno

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Setiawan, Nur Candra Eka, and Putri Ridha Ilahi. "Identification of Misconceptions in Chemical Bonding Materials Using Three Tier Diagnostic Test." Journal of Natural Science and Integration 5, no. 1 (April 30, 2022): 77. http://dx.doi.org/10.24014/jnsi.v5i1.16860.

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Chemistry learning focuses on understanding concepts, thus students who get difficulty understanding the concepts of chemistry learning will experience conceptual mistakes, especially abstract concepts such as chemical bonds. Students' difficulty understanding the material of chemical bonds can occur due to misconceptions. The misconceptions will hinder the construction and assimilation of new knowledge in students and thus students will experience difficulties in learning chemistry. To address such issue, an instrument for detecting misconceptions in chemistry is necessary to find out the mis

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Kuang, Ge, Zhi Bin Chen, Hui Guo та Ming Hao Li. "Lithium Extraction Mechanism from α-Spodumene by Fluorine Chemical Method". Advanced Materials Research 524-527 (травень 2012): 2011–16. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.2011.

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In order to decrease lithium extraction cost, pollution and energy. A new and efficient technology was particularly discussed in this paper, the fluorine chemical method to extract lithium from spodumene. The reaction mechanism had also been analysed by studying the crystal structure variation and reaction products. The results show that hydrofluoric acid corroded α-spodumene in low temperature, damaged the compact chemical bonds: Li-O, Al-O, Si-O, and Al-O-Si, and generated Li3AlF6 and AlF3, which can be dissolved in sulfuric acid. Our research provides theoretical guidance for the lithium ex

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Ibrahim, Muhammad Aidil, Nur Atikah M. Jani, Oskar Hasdinor Hassan, F. Abdullah, T. I. T. Kudin, Ab Malik Marwan Ali, and Muhd Zu Azhan Yahya. "FTIR Spectrum Investigation of Thionine-Graphene Nanocomposite." Applied Mechanics and Materials 864 (April 2017): 42–47. http://dx.doi.org/10.4028/www.scientific.net/amm.864.42.

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Graphene is a material that has been heavily investigated in many researches due to its beneficial characteristics such as large surface area, low manufacturing cost, high electro conductivity and incredible mechanical strength. Applying the graphene in water-based solvents however can cause agglomeration due to its hydrophobic properties. Researchers have composited the graphene with other materials in overcoming its hydrophobicity. In this research, graphene was nanocomposited with thionine to make it disperse well in water-based solvents while preserving its intrinsic properties. The nanoco

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Tam, Justin Z., Talulla Palumbo, Julie M. Miwa, and Brian Y. Chen. "Analysis of Protein-Protein Interactions for Intermolecular Bond Prediction." Molecules 27, no. 19 (September 21, 2022): 6178. http://dx.doi.org/10.3390/molecules27196178.

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Protein-protein interactions often involve a complex system of intermolecular interactions between residues and atoms at the binding site. A comprehensive exploration of these interactions can help reveal key residues involved in protein-protein recognition that are not obvious using other protein analysis techniques. This paper presents and extends DiffBond, a novel method for identifying and classifying intermolecular bonds while applying standard definitions of bonds in chemical literature to explain protein interactions. DiffBond predicted intermolecular bonds from four protein complexes:

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Zenil, Hector, Narsis A. Kiani, Ming-mei Shang, and Jesper Tegnér. "Algorithmic Complexity and Reprogrammability of Chemical Structure Networks." Parallel Processing Letters 28, no. 01 (March 2018): 1850005. http://dx.doi.org/10.1142/s0129626418500056.

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Here we address the challenge of profiling causal properties and tracking the transformation of chemical compounds from an algorithmic perspective. We explore the potential of applying a computational interventional calculus based on the principles of algorithmic probability to chemical structure networks. We profile the sensitivity of the elements and covalent bonds in a chemical structure network algorithmically, asking whether reprogrammability affords information about thermodynamic and chemical processes involved in the transformation of different compound classes. We arrive at numerical

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Korolev, Slava, and Alexsander Lavrov. "Research and technological testing of ores with dispersed gold of the Yellow Jacket Deposit." E3S Web of Conferences 192 (2020): 02027. http://dx.doi.org/10.1051/e3sconf/202019202027.

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The article discusses the mineral and geochemical features of the yellow Jacket ore Deposit located in Clark County, Nevada. Тhe Deposit differs significantly in many mineral and geochemical features from the deposits of dispersed gold ores belonging to the so-called Karlin formation type in compacted and locally weakly metamorphosed strata of carbonate rocks, mudstones and carbonated shales (carbonated turbidites). Positive results of analyses, including those with a cupellation (gravimetric) termination, were obtained in laboratories using non-standard approaches to sample preparation. Based

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Ermania Widjajantin and Rusmilawati Windari. "PEDOPHILIA AS A FORM OF SEXUAL DEVIANCE FROM A SOCIAL BONDS THEORETICAL PERSPECTIVE." IIUM Law Journal 29, (S1) (May 12, 2021): 177–94. http://dx.doi.org/10.31436/iiumlj.v29i(s1).641.

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Sexual crimes have seen a considerably increase in Indonesia. It not only affects women but also children. Sexual crime against children is also known as “pedophilia” and has now become a terrifying phenomenon. The escalation of sexual crime against children in Indonesia shows that there is a dire need to look into possible prevention strategies to sexual crime prevention. Considering the rapid increase of case of pedophilia in Indonesia, the government has enacted more severe punisment to the offender, that is, by imposing chemical castration under the Law No. 17 Year 2016 on the second amend

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Шматко, В. А., Т. Н. Мясоедова та Г. Э. Яловега. "Электронная структура полианилина, модифицированного солями меди и циркония". Журнал технической физики 128, № 5 (2020): 617. http://dx.doi.org/10.21883/os.2020.05.49319.328-19.

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The results of spectroscopic studies of the electronic structure and chemical bonds of PANI - Me composites (Me - Cu, Zr) are presented. X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, IR spectroscopy were used for research. It was established that regardless of which modifying additive polyaniline is used in composites is in partially oxidized form, however, in PANI - Zr is more oxidized than in PANI - Cu. The chemical states of nitrogen in the composites are determined; a different ratio of neutral and charged nitrogen groups is observed.

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Rey, Alicia, Arturo Espinosa Ferao, and Rainer Streubel. "Quantum Chemical Calculations on CHOP Derivatives—Spanning the Chemical Space of Phosphinidenes, Phosphaketenes, Oxaphosphirenes, and COP− Isomers." Molecules 23, no. 12 (December 17, 2018): 3341. http://dx.doi.org/10.3390/molecules23123341.

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After many decades of intense research in low-coordinate phosphorus chemistry, the advent of Na[OCP] brought new stimuli to the field of CHOP isomers and derivatives thereof. The present theoretical study at the CCSD(T)/def2-TZVPP level describes the chemical space of CHOP isomers in terms of structures and potential energy surfaces, using oxaphosphirene as the starting point, but also covering substituted derivatives and COP− isomers. Bonding properties of the P–C, P–O, and C–O bonds in all neutral and anionic isomeric species are discussed on the basis of theoretical calculations using vario

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Li, Yaoming, Xin Pei, Huang Zhang, and Meini Yuan. "A First-Principle Study of Interactions between Magnesium and Metal-Atom-Doped Graphene." Nanomaterials 12, no. 5 (March 1, 2022): 834. http://dx.doi.org/10.3390/nano12050834.

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In this study, the interactions of magnesium (Mg) atom and Mg(001) surface with different metal-atom-doped graphene were investigated using a density functional theory (DFT) method. For the interactions of magnesium with Al-, Mn-, Zn-, and Zr-doped and intrinsic graphene, it was found that the magnesium atoms were physisorbed into the hollow sites of the intrinsic graphene with only the smallest interaction energy (approximately −1.900 eV). However, the magnesium atoms tended to be chemisorbed on the doped graphene, which exhibited larger interaction energies and charge transfers. Additionally

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Kwun, Young, Abaid Virk, Waqas Nazeer, M. Rehman, and Shin Kang. "On the Multiplicative Degree-Based Topological Indices of Silicon-Carbon Si2C3-I[p,q] and Si2C3-II[p,q]." Symmetry 10, no. 8 (August 3, 2018): 320. http://dx.doi.org/10.3390/sym10080320.

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The application of graph theory in chemical and molecular structure research has far exceeded people’s expectations, and it has recently grown exponentially. In the molecular graph, atoms are represented by vertices and bonds by edges. Topological indices help us to predict many physico-chemical properties of the concerned molecular compound. In this article, we compute Generalized first and multiplicative Zagreb indices, the multiplicative version of the atomic bond connectivity index, and the Generalized multiplicative Geometric Arithmetic index for silicon-carbon Si2C3−I[p,q] and Si2C3−II[p

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Anandari, Risma Nila, Siti Khaizatul Minnah, Vidya Utami Widadni, Dona Safira, and Fatchiyah Fatchiyah. "In-Silico Analysis of Procyanidin Type-A Extracted From Cinnamon for Diabetes Mellitus Type 2 Treatment." JSMARTech 2, no. 3 (October 1, 2021): 92–95. http://dx.doi.org/10.21776/ub.jsmartech.2021.002.03.92.

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Type 2 diabetes mellitus (T2DM) is the most common disease in developing countries. People with type-2 diabetes are at high risk of complications leading to disability and premature death. Procyanidin compounds in cinnamon have an insulin-like activity that can regulate normal blood sugar levels. This research aimed to investigate the interaction between α-glucosidase and α-amylase with procyanidin A and their potential for diabetes treatment therapy. Data mining receptor was downloaded from RCSB PDB and ligands from PubChem. Drug likeness properties were evaluated using SwissADME, while toxic

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Hassanain, Waleed A., and Emad L. Izake. "Toward Label-Free SERS Detection of Proteins through Their Disulfide Bond Structure." SLAS DISCOVERY: Advancing the Science of Drug Discovery 25, no. 1 (September 19, 2019): 87–94. http://dx.doi.org/10.1177/2472555219875102.

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The molecular structure of many proteins contains disulfide bonds between their cysteine residues. In this work we demonstrate the utilization of the disulfide bond structure of proteins for their label-free determination by surface-enhanced Raman spectroscopy (SERS). The new approach for label-free SERS detection of proteins is demonstrated for human insulin. The protein was selectively extracted from spiked plasma samples using target-specific functionalized nanomaterial. Enzyme-linked immune assay (ELISA) was used to detect insulin in the blood plasma and cross-validate the SERS method. The

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Seyyedi, Behnam, Mohammad Edrisi, Maryam Seyyedi, and Gholamreza Mahdavinia. "A new single step synthesis of copper phthalocyanine green using microwave irradiation effects in functionalisation of C−H bonds in aromatic rings." Pigment & Resin Technology 43, no. 3 (April 29, 2014): 113–17. http://dx.doi.org/10.1108/prt-04-2013-0029.

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Purpose – The paper introduces a new method for single step synthesis of copper phthalocyanine green pigment using microwave irradiation to activate C−H bonds on the aromatic rings that are possible by creation of chlorine radicals. The aims of this study are to investigate the possibility of high-efficiency product reaction, removing acidic wastewater, time optimization, and maximizing number of chlorine on aromatic rings. Design/methodology/approach – The paper presents a new synthesis technique, which does not have the problems of the conventional methods. Microwave irradiation is used as a

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Kijaszek, Wojciech, Waldemar Oleszkiewicz, Adrian Zakrzewski, Sergiusz Patela, and Marek Tłaczała. "Investigation of optical properties of silicon oxynitride films deposited by RF PECVD method." Materials Science-Poland 34, no. 4 (December 1, 2016): 868–71. http://dx.doi.org/10.1515/msp-2016-0111.

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AbstractIn this study, the authors deposited silicon oxynitride films by Radio Frequency Plasma Enhanced Chemical Vapour Deposition (RF PECVD) method. The research explores the relationship between the deposition process parameters and the optical properties of the deposited SiOxNy films. The optical constants of SiOxNy films were measured and calculated by spectroscopic ellipsometry method. Additionally, the authors investigated the possibility of controlling the deposited film composition by the flow ratio of different gaseous precursors: ammonia (NH3), diluted silane (2%SiH4/98%N2), nitrous

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Alkorta, Ibon, José Elguero, and Antonio Frontera. "Not Only Hydrogen Bonds: Other Noncovalent Interactions." Crystals 10, no. 3 (March 6, 2020): 180. http://dx.doi.org/10.3390/cryst10030180.

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In this review, we provide a consistent description of noncovalent interactions, covering most groups of the Periodic Table. Different types of bonds are discussed using their trivial names. Moreover, the new name “Spodium bonds” is proposed for group 12 since noncovalent interactions involving this group of elements as electron acceptors have not yet been named. Excluding hydrogen bonds, the following noncovalent interactions will be discussed: alkali, alkaline earth, regium, spodium, triel, tetrel, pnictogen, chalcogen, halogen, and aerogen, which almost covers the Periodic Table entirely. O

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Yang, Hui, Tian He, and Xixi Yan. "Adhesion strategies for heterogeneous soft materials—A review." Engineering Research Express 4, no. 1 (January 14, 2022): 012001. http://dx.doi.org/10.1088/2631-8695/ac342e.

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Abstract Adhesion is a long-term research topic of great importance attracting plenty of attention. In past few years, many remarkable advances have been made in the field of heterogeneous soft material adhesion, considerably boosting the functional diversity and viability of heterogeneous soft material assemblies. This review focuses on the status quo of this field with attention leaning towards recently active and outstanding bioinspiration and biomimetic areas. First, the fundamental mechanisms of adhesion, including chemical bonds, topological entanglement, and gradient connections, are in

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Kamaluddin, Agus. "Chemo-entrepreneurship Modelling on Chemical Bonding Materials as an Effort to Grow Entrepreneurial Spirit of Students with Hearing Impairment in (Islamic) Senior High School." International Journal of Chemistry Education Research 2, no. 1 (February 19, 2018): 34–44. http://dx.doi.org/10.20885/ijcer.v2i1.10085.

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ABSTRACT: This research aims to develop MEc Bond learning media (Magnetic Educhem Bonding) for students with hearing impairment in (Islamic) senior high school based on chemo-entrepreneurship modeling. This research uses the development model by Borg & Gall that includes the identification of potentials and problems, product selection, literature review, planning, developing initial product draft, initial field trials and product revisions, and it ends with major field trials and product revision. The subjects of this research include material experts, media experts, disability experts, se

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Kamaluddin, Agus. "Chemo-entrepreneurship Modelling on Chemical Bonding Materials as an Effort to Grow Entrepreneurial Spirit of Students with Hearing Impairment in (Islamic) Senior High School." International Journal of Chemistry Education Research 2, no. 1 (February 19, 2018): 34–44. http://dx.doi.org/10.20885/ijcer.vol2.iss1.art6.

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ABSTRACT: This research aims to develop MEc Bond learning media (Magnetic Educhem Bonding) for students with hearing impairment in (Islamic) senior high school based on chemo-entrepreneurship modeling. This research uses the development model by Borg & Gall that includes the identification of potentials and problems, product selection, literature review, planning, developing initial product draft, initial field trials and product revisions, and it ends with major field trials and product revision. The subjects of this research include material experts, media experts, disability experts, se

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Cong, Qiao, Xing Yuan, and Jiao Qu. "A review on the removal of antibiotics by carbon nanotubes." Water Science and Technology 68, no. 8 (October 1, 2013): 1679–87. http://dx.doi.org/10.2166/wst.2013.420.

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Increasing concerns have been raised regarding the potential risks of antibiotics to human and ecological health due to their extensive use. Carbon nanotubes (CNTs) have drawn special research attention because of their unique properties and potential applications as a kind of adsorbents. This review summarizes the currently available research on the adsorption of antibiotics on CNTs, and will provide useful information for CNT application and risk assessment. Four different models, the Freundlich model (FM), Langmuir model (LM), Polanyi–Mane model (PMM), and Dubinin–Ashtakhov model (DAM), are

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