Littérature scientifique sur le sujet « Qualitative Analytic Chemistry »
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Articles de revues sur le sujet "Qualitative Analytic Chemistry"
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Widarti, Hayuni Retno, Deni Ainur Rokhim, M. Muchson, Endang Budiasih, Sutrisno Sutrisno, Rico Wahyu Pratama et Moh Ilmanul Hakim. « Developing Integrated Triplet Multi-Representation Virtual Laboratory in Analytic Chemical Materials ». International Journal of Interactive Mobile Technologies (iJIM) 15, no 08 (23 avril 2021) : 119. http://dx.doi.org/10.3991/ijim.v15i08.21573.
Texte intégralRésumé :
<p>Technological developments have triggered the emergence of various kinds of learning media innovations. Learning media is a very important part of the learning process. In this study, researchers designed a learning media in the form of a virtual laboratory on the practicum material of the basics of analytical chemistry which is integrated with multi-representation triplets to create and describe the results of learning media.</p>The method used in this development was Research and Development (R&D) method using the 4-D (four-D) development model. Data collection used qualitative and quantitative data. The qualitative data were in the form of comments and suggestions from the validator, while the quantitative data were the validation questionnaire and legibility test. The results showed that the validation of the material obtained a percentage of 84% (very valid), media validation of 78% (valid), and the results of trials on correspondents obtained a percentage in the range 81-92% (very valid). It can be concluded that the virtual laboratory learning media on the analytical chemistry laboratory material with the integration of the developed multi-representation triplet explanations is feasible to use, especially in the practicum of the basics of analytical chemistry on the topic of group I cation analysis and argentometry. This shows that the virtual laboratory developed has the potential to support online practicum learning, and the macroscopic, submicroscopic, and symbolic depiction in the virtual laboratory can help the process of receiving information by students
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Romadhiyana Kisno Saputri et Akhmad Al-Bari. « PERSEPSI MAHASISWA TERHADAP PRAKTIKUM DARING MATA KULIAH KIMIA ANALISIS ». Jurnal Educatio FKIP UNMA 6, no 2 (23 décembre 2020) : 676–83. http://dx.doi.org/10.31949/educatio.v6i2.723.
Texte intégralRésumé :
During the COVID-19 pandemic period, every education unit requires an online learning process, not only for theoretical courses, but also for practical courses, including analytical chemistry practicum courses. Student perceptions of online lectures can help students in implementing the process lectures during the Covid 19 pandemic, because a good and correct lecture will help students improve their understanding and knowledge of students. This study aims to find out students perception about online practicum in analytical chemistry. This research is a qualitative descriptive study. The sample was taken using simple random sampling consisted of 45 students. Data were obtained using questionnaires and in-depth interviews. Student perceptions were seen from three aspects, teaching and learning process, the ability of lecturers, facilities and infrastructure which were assessed using a likert scale. The data analysis by qualitative analysis, consisting of data collection, data reduction, data presentation, and conclusion drawing. Student perceptions in all aspects have a mean of 64.95% so that students 'perceptions of online practicum in analytical chemistry are positive. Students' perceptions of teaching and learning aspects have a value of 69.57% which indicates a positive perception, on aspects of lecturer competence have a value. 77.90% which shows a positive perception of the infrastructure aspect has a value of 47.39% which indicates a positive perception.
Keywords: students perceptions; online practicum; Analytic Chemistry
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Rosita, Betti, et Ulfa Khairani. « ANALISIS LAMA WAKTU PELAYANAN LABORATORIUM DI RUMAH SAKIT UMUM DAERAH PASAMAN BARAT ». JURNAL KESEHATAN PERINTIS (Perintis's Health Journal) 5, no 1 (29 juin 2018) : 114–21. http://dx.doi.org/10.33653/jkp.v5i1.153.
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Hospital laboratory services is one of the activities in hospitals that support quality health services. One indicator of the success of health services in the field of clinical pathology laboratory services is the waiting time for laboratory services. The standard set for laboratory service outcome waiting time is ≤ 140 minutes for blood chemistry and routine blood. This research analyzed the service time of outpatient laboratory that conducted hematology and clinical chemistry examination in the laboratory of Pasaman Barat Hospital. This research is a type of descriptive analytic research that is quantitative and supported by qualitative using cross sectional approach. The result of the research showed that laboratory service time at RSUD Pasaman Barat fulfilled the standard (≤ 140 minutes) for hematology examination 33.94 minutes, clinical chemistry 83.92 minutes, hematology and clinical chemistry 98 minutes. Based on the results of this study, the stages that contribute to the length of time laboratory services for hematological examination lies in the pre analytical stage, for clinical chemistry examination is located at the analytical stage, as well as for hematology and clinical chemistry examination lies in the analytic stage as well as the factors that affect the length of time laboratory services are human resources that is in the ability of officers and infrastructure facilities
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Upadhyay, Hemant K., Sapna Juneja, Ghulam Muhammad, Ali Nauman et Nancy Awadallah Awad. « Analysis of IoT-Related Ergonomics-Based Healthcare Issues Using Analytic Hierarchy Process Methodology ». Sensors 22, no 21 (27 octobre 2022) : 8232. http://dx.doi.org/10.3390/s22218232.
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The objective of the present work is for assessing ergonomics-based IoT (Internet of Things) related healthcare issues with the use of a popular multi-criteria decision-making technique named the analytic hierarchy process (AHP). Multiple criteria decision making (MCDM) is a technique that combines alternative performance across numerous contradicting, qualitative, and/or quantitative criteria, resulting in a solution requiring a consensus. The AHP is a flexible strategy for organizing and simplifying complex MCDM concerns by disassembling a compound decision problem into an ordered array of relational decision components (evaluation criteria, sub-criteria, and substitutions). A total of twelve IoT-related ergonomics-based healthcare issues have been recognized as Lumbago (lower backache), Cervicalgia (neck ache), shoulder pain; digital eye strain, hearing impairment, carpal tunnel syndrome; distress, exhaustion, depression; obesity, high blood pressure, hyperglycemia. “Distress” has proven itself the most critical IoT-related ergonomics-based healthcare issue, followed by obesity, depression, and exhaustion. These IoT-related ergonomics-based healthcare issues in four categories (excruciating issues, eye-ear-nerve issues, psychosocial issues, and persistent issues) have been compared and ranked. Based on calculated mathematical values, “psychosocial issues” have been ranked in the first position followed by “persistent issues” and “eye-ear-nerve issues”. In several industrial systems, the results may be of vital importance for increasing the efficiency of human force, particularly a human–computer interface for prolonged hours.
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Raga, A. C., et J. Cantó. « Mixing layers in flows in star forming regions ». Symposium - International Astronomical Union 178 (1997) : 89–102. http://dx.doi.org/10.1017/s0074180900009268.
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There are now many observations of high velocity, molecular emission associated with outflows from young stars. This emission might come from molecules that are formed in the outflowing material, or from entrained, ambient molecular gas. The present paper explores the latter possibility, describing the efforts that have been made to model the “lateral entrainment” that occurs in the turbulent mixing layer formed along the edges of a jet-like flow (or, equivalently, at any interface between a fast moving flow and the surrounding environment). A simple, analytic approach based on model equations is used to provide a qualitative picture of the dynamical, thermal and chemical structure of such a turbulent mixing layer. Finally, a review of the efforts up to date of modelling the dynamics and chemistry of turbulent mixing layers is presented.
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Seo, Sang, et Dohoon Kim. « Study on Inside Threats Based on Analytic Hierarchy Process ». Symmetry 12, no 8 (29 juillet 2020) : 1255. http://dx.doi.org/10.3390/sym12081255.
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Insider threats that occur within organizations cause more serious damage than external threats. However, there are many factors that are difficult to determine, such as the definition, classification, and severity of security breaches; hence, it is necessary to analyze system logs and user behavior-based scenarios within organizations. The reality is that qualitative judgment criteria are different for everyone to apply, and there is no detailed verification procedure to compare them objectively. In this study, realistic insider threats were examined through the definition, classification, and correlation/association analysis of various human–machine logs of acts associated with security breaches that occur in an organization. In addition, a quantitative process and decision-making tool were developed for insider threats by establishing various internal information leakage scenarios. As a result, insider threats were assessed quantitatively and a decision-making process was completed that enabled case analysis based on several insider threat scenarios. This study will enable precise modeling of insider threats that occur in real organizations and will support an objective process and a decision-making system to establish a range of required information for security protection measures.
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Halliwell, BS, IBCLC, Hannah A., Ebony King, MD, Maggie Gonzalez-Matute, BS, Jeremy A. Kirksey, BS, Cheldy Martinez, BS, Micharri Pratts, BA, RN, Sivanah Ybarra, BSPH, Nikesha Williams, BS et Shervin Assari, MD, MPH. « “It’s Like the Elephant in the Room” A Qualitative Analysis of Racism in a U.S. High School ». World Journal of Educational Research 9, no 4 (17 août 2022) : p28. http://dx.doi.org/10.22158/wjer.v9n4p28.
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Identifying and addressing systemic racial oppression in the education system is a key component in confronting pervasive health and economic disparities for Black students. In this qualitative study, we conducted secondary analysis of existing data. Transcripts of interviews and focus group discussions belonged to 21 Black students in a charter school in Michigan in the year 2013. Open access data were downloaded from University of Michigan’s Inter-university Consortium for Political and Social Research (ICPSR) database in 2022. We used an inductive analytic approach to analyze the qualitative data for constructs related to experiences of structural racism. Three constructs that characterized students’ experiences of structural racism in the U.S. education system were found: (a) Lack of Color-conscious Curriculum; (b) Selective Cultural Erasure; and (c) The Demonstration of Racialized Power. For researchers, these data highlight a need for more studies on the effects of structural racism in the U.S. education system on educational, economic, and health outcomes. For administrative and policy makers, the results emphasize the need for educational initiatives that address deeply-rooted structural inequalities in the U.S. education system. This may include adoption of color-conscious curriculum and culturally responsive pedagogy, the utilization of restorative justice practices, and reparations for Black Americans.
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ElQasaby, Ahmed R., Fahad K. Alqahtani et Mohammed Alheyf. « State of the Art of BIM Integration with Sensing Technologies in Construction Progress Monitoring ». Sensors 22, no 9 (4 mai 2022) : 3497. http://dx.doi.org/10.3390/s22093497.
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The necessity for automatic monitoring tools led to using 3D sensing technologies to collect accurate and precise data onsite to create an as-built model. This as-built model can be integrated with a BIM-based planned model to check the project’s status based on algorithms. This article investigates the construction progress monitoring (CPM) domain, including knowledge gaps and future research direction. Synthesis literature was conducted on 3D sensing technologies in CPM depending on crucial factors, including the scanning environment, assessment level, and object recognition indicators’ performance. The scanning environment is important to determine the volume of data acquired and the applications conducted in the environment. The level of assessment between as-planned and as-built models is another crucial factor that could precisely help define the knowledge gaps in this domain. The performance of object recognition indicators is an essential factor in determining the quality of studies. Qualitative and statistical analyses for the latest studies are then conducted. The qualitative analysis showed a shortage of articles performed on 5D assessment. Then, statistical analysis is conducted using a meta-analytic regression model to determine the development of the performance of object recognition indicators. The meta-analytic model presented a good sign that the performance of those indicators is effective where [p-value is = 0.0003 < 0.05]. The study is also envisaged to evaluate the collected studies in prioritizing future works from the limitations within these studies. Finally, this is the first study to address ranking studies of 3D sensing technologies in the CPM domain integrated with BIM.
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Wulandari, Wulandari, Suci Siti Lathifah et Oding Sunardi. « IMPLEMENTASI PEMBELAJARAN BIOLOGI BAGI ANAK BERKEBUTUHAN KHUSUS DI SEKOLAH LUAR BIASA BAGIAN B (TUNARUNGU) SMALB DHARMA WANITA KOTA BOGOR ». Bioilmi : Jurnal Pendidikan 7, no 1 (1 janvier 2021) : 18–23. http://dx.doi.org/10.19109/bioilmi.v7i1.9495.
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This research is a qualitative research with descriptive analytic method. The purpose of this study was to describe an analyze learning at SMALB Dharma Wanita Kota Bogor. This research was carried out from February 2019 to Juli 2019 with several informan namely Biology Teacher 1, Principal, Biology Teacher 2, Parents Of Students, Students and Curriculum. This research was conducted with direct contact with the subject of research foun in the field and obtained two types of data, namely primary data derived from interviews and observations, as well as secondary data derived from study documentation, based on data analysis, biology learning in to 3 processes, bamely planning, implementation and evaluation. Biology learning planning at SMALB Dharma Wanita, namely the teacher holding a work meeting ( in house training) discusses the completeness of the administration of the teacher and strategies or methods that will be used by the class. The implementation of biology learning at SMALB Dharma Wanita consists of introductory, core and concluding activities. Evaluation of learning in SMALB Dharma Wanita consists of cognitive, affektive and psychomotor.
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Kumar, Nand Kishor. « Relationship Between Differential Equations and Difference Equation ». NUTA Journal 8, no 1-2 (31 décembre 2021) : 88–93. http://dx.doi.org/10.3126/nutaj.v8i1-2.44113.
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The study of Differential equations and Difference equations play animportant and significant role in many sciences. These equations are used as mathematical tool used in solving various problems in modeling,physics, chemistry,biology, anthropology, etc. or even in social studies. Differential equations are used to solve real life problems by approximation of numerical methods. Theory of Differential and Difference equations has been taught at all levels in high schools and at the universities for all students, including students majoring in Mathematics.
This is a micro –study in which the research is designed in an exploitative, qualitative, descriptive and analytic framework to analyze the differential-difference equations. In this study, theoretical concepts, descriptive, analytical and numerical methods about differential-difference equations which areclarified by related examples. This research article seeks to study the relationship between them.
The finite difference method for solving equations leads to difference equationtheory, developing a parallel between difference equations and differential equations. The first differences are related to the first derivatives. Difference equations are discrete versions of differential equations, and similarly differential equations are continuous versions of difference equations.
Thèses sur le sujet "Qualitative Analytic Chemistry"
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Asimopoulos, George. « Hartley transform based algorithm for the qualitative and quantitative analysis of multi-component mixtures with the use of emission excitation matrices ». Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06062008-171404/.
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Menegotto, Morgana. « Avaliação da degradação biótica do poli(ácido lático), do polipropileno e suas misturas pela ação de fungos basidiomicetos ». reponame:Repositório Institucional da UCS, 2014. https://repositorio.ucs.br/handle/11338/887.
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Resíduos poliméricos, quando destinados em ambientes inadequados, associados a sua resistência à degradação, podem promover poluição ambiental. Desta forma, estudos que possibilitam favorecer a degradação de alguns polímeros vêm crescendo e são considerados como alternativa para os atuais problemas de poluição ambiental. Outra alternativa que possibilita alterar características de interesse dos polímeros é por meio do desenvolvimento de misturas poliméricas, sendo que suas propriedades físicas e químicas podem ser alteradas para uma vasta gama de aplicações, proporcionando desempenho desejável ao produto final. Neste trabalho foi desenvolvida misturas poliméricas entre o polipropileno (PP), polímero sintético, e o poli(ácido lático) (PLA), polímero biodegradável com e sem a presença de agente compatibilizante (AC) a base de PP modificado com anidrido maleico. O objetivo do trabalho foi avaliar as propriedades da mistura de PLA e PP sem e com a presença de agente compatibilizante, bem como a ação de 10 fungos asidiomicetos isolados dos biomas mata atlântica e pampa na degradação individualmente dos polímeros e da mistura de PLA/PP. As misturas poliméricas foram produzidas por processo de extrusão e injeção e verificadas as propriedades morfológicas, térmicas, químicas e mecânicas. Para o processo de degradação biológica em cultivo sólido in vitro foram produzidos filmes de PP, PLA e suas misturas, por moldagem por compressão. Os polímeros puros foram submetidos à exposição aos 10 fungos por períodos de 14, 28 e 75 dias a 28°C sendo os fungos Trametes villosa (Sw.) Kreisel 82I.6, Schizophyllum cf. commune (Fr.) 85E.16 e Auricularia bull Ex. Juss. 551.9B os que proporcionaram indícios de degradação nos filmes de PLA e o fungo T. villosa (Sw.) Kreisel 82I.6 nos filmes de PP. A mistura de PLA/AC/PP (75/3/25) selecionada por apresentar maior caráter hidrofílico, foi submetida à exposição ao fungo T. villosa (Sw.) Kreisel 82I.6 por 14, 28 e 60 dias a 28°C. Após o período avaliado, foram verificadas as propriedades físicas (perda de massa), morfológicas (microscopia ótica e microscopia eletrônica de varredura) e características químicas (espectroscopia no infravermelho com transformada de Fourier). Como resultados das propriedades das misturas, estas mostraram-se imiscíveis e as propriedades mecânicas foram inferiores as do PLA, sem alteração da estabilidade térmica e mudança da hidrofilia com o aumento de PP. O PLA diminuiu sua cristalinidade após o processamento e o PP aumentou. Foram produzidos extratos em cultivo líquido do PLA com os fungos T. villosa (Sw.) Kreisel 82I.6, S. cf. commune (Fr.) 85E.16 e A. bull Ex. Juss. 551.9B e do PP com o fungo T. villosa (Sw.) Kreisel 82I.6, contudo as enzimas não foram eficientes quanto a degradação biológica nos caldos. Os fungos que apresentaram maior potencial de degradação em cultivo sólido do PLA foram o T. villosa (Sw.) Kreisel 82I.6, S. cf. commune (Fr.) 85E.16 e A. bull Ex. Juss 551.9B e para o PP foi o fungo T. villosa (Sw.) Kreisel 82I.6; evidenciado na colonização da superfície com remoção de material após 28 e 75 dias de incubação. O fungo T. villosa (Sw.) Kreisel 82I.6 utilizado no processo de degradação em cultivo sólido da mistura PLA/AC/PP (75/3/25) propiciou que fosse identificado indícios de degradação nos períodos estudados.Submitted by Ana Guimarães Pereira (agpereir@ucs.br) on 2015-02-20T16:07:37Z No. of bitstreams: 1 Dissertacao Morgana Menegotto.pdf: 4833989 bytes, checksum: 9e911dfa8cf78af6b06ea5d15a320088 (MD5)
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Bolsa de Desenvolvimento Tecnológico e Inovação
Polymeric wastes when intended improperly, associated with its resistance to degradation may promote environmental pollution. Therefore, studies involving the degradation of some polymers are considered as an alternative to current environmental pollution problems. Another alternative that allows changing the characteristics of interest of the polymers is through the development of polyblends, and their physical and chemical properties can be changed to a wide range of applications, providing desirable performance to the final product. In this work were used polypropylene (PP), synthetic polymer, and polylactic acid (PLA), biodegradable polymer with and without the presence of compatibilizer (AC) based maleic anhydride modified PP. The objective of this study was to evaluate the properties of the blend of PLA and PP with and without the presence of compatibilizer as well the action of 10 basidiomycete fungi isolated from biomes, rainforest and pampa in as individually degradation polymers and the blends of PLA/PP. Polyblends of PP and PLA with and without the presence of a compatibilizer were produced by extrusion and injection process and morphological analysis, thermal, chemical and mechanical properties. For the process of biological degradation in solid culture in vitro were produced films of PP, PLA and their blend by compression molding. The pure polymers were subjected to exposure to the ten basidiomycete fungi for a period of 14, 28 and 75 days at 28°C, being the fungi Trametes villosa (Sw.) Kreisel 82I.6, Schizophyllum cf. commune (Fr.) 85E.16 and Auricularia bull Ex. Juss. 551.9B those who have provided evidence of degradation in the films of PLA and the fungus T. villosa (Sw.) Kreisel 82I.6 in the films of PP. A blend of PLA/AC/PP 75/3/25 selected due to its higher hydrophilic character, was subjected to exposure to the fungus T. villosa (Sw.) Kreisel 82I.6 during 14, 28 and 60 days at 28°C. After the evaluation period the physical properties (weight loss), morphological (light microscopy and scanning lectron microscopy) and chemical characteristics (infrared spectroscopy with Fourier transform) were observed. As a result of the properties of the blends, these proved to be immiscible, and the mechanical properties were lower than those of the PLA, without change in thermal stability and change in hydrophilicity with PP increasing. PLA decreased crystallinity after processing and PP increased. The solutions produced in liquid culture of the PLA with fungi T. villosa (Sw.) Kreisel 82I.6, S. cf. commune (Fr.) 85E.16 and A. bull Ex Juss. 551.9B and PP with the fungus T. villosa (Sw.) Kreisel 82I.6, however, the enzymes were not as efficient biological degradation in the broth. The fungi that showed higher degradation potential in solid culture of PLA were the T. villosa (Sw.) Kreisel 82I.6, S. cf. commune (Fr.) 85E.16 and A. bull Ex. Juss 551.9B below those reported in the literature time and the PP, the fungus T. villosa (Sw.) Kreisel 82I.6.; it promoted surface changes with removal of material after 28 and 75 days of incubation. The fungus T. villosa (Sw.) Kreisel 82I.6 used in the process of degradation in solid culture blend PLA/AC/PP (75/3/25), was identified that provided evidence of degradation during periods of exposure this study.
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Mahuteau, Laurent. « Study of algorithms for analysis of xrf spectra to automate inspection of carpets ». Thesis, Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26625.
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The objective of this thesis is to categorize carpet types according to their XRF spectra and verify if further classification of carpets is possible for use of an XRF analysis system in the carpet manufacturing line. This thesis consists of (1) implementing and studying effective algorithms for automated analysis of X-ray spectra, (2) comparing known algorithms for X-ray spectra analysis, and (3) implementing our own algorithm for classification of carpets spectra obtained for further fluorine online analysis of XRF inspected carpets. This research is intended for quick and accurate automated analysis of raw XRF spectra and matching analysis results to a database of XRF spectra of raw carpets. The research uses spectrum signal processing and spectrum analysis regarding efficacy of combined methods for XRF inspected carpets.
X-Ray Fluorescence is a key technology for detection of chemical elements. Fluorine is a key element for carpet's quality. XRF has been chosen to be a potential candidate to measure fluorine since it is a versatile tool for low concentration element detection. Due to specific XRF background spectrum for each different carpet type, carpet samples may need specific calibrations for further computation of carpet fluorine concentration. Automating the detection of the carpet type is intended to help in automating the XRF calibration.
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Calloni, Caroline. « Jabuticaba (Plinia trunciflora (O. Berg) Kausel) : composição química, atividade antioxidante in vitro e redução do etresse oxidativo/nitrosativo via modulação da função mitocondrial em cultura de fibroblastos humanos (MRC-5) ». reponame:Repositório Institucional da UCS, 2014. https://repositorio.ucs.br/handle/11338/882.
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A jabuticaba (Plinia sp.), uma fruta nativa do Brasil, tem despertado grande interesse científico devido ao seu conteúdo de fitonutrientes e seus benefícios a saúde, sendo considerada um alimento funcional. Estudos demonstraram que a jabuticaba é rica em compostos fenólicos, principalmente antocianinas e flavonóis. Esses compostos vêm sendo relacionados à redução da incidência de doenças que apresentam o estresse oxidativo e nitrosativo em sua fisiopatologia, como doenças cardiovasculares, diabetes e o câncer. Recentemente, estudos têm demonstrado que a disfunção mitocondrial está presente como um fator determinante no desenvolvimento e progressão do estresse oxidativo e nitrosativo e que compostos fenólicos teriam a capacidade de regular essa disfunção. Neste contexto, o objetivo deste trabalho foi avaliar a composição de macronutrientes, o conteúdo de compostos fenólicos totais e antocianinas da casca e da polpa de jabuticaba (P. trunciflora). Paralelamente, determinou-se a composição química do extrato de casca de jabuticaba (ECJ), através de espectrometria de massas, e a sua atividade antioxidante in vitro através dos ensaios de DPPH• e ABTS•+. Além disso, avaliou-se a capacidade do ECJ em reduzir o estresse oxidativo/nitrosativo e modular a função mitocondrial, a qual foi determinada através da atividade do complexo I da cadeia de transporte de elétrons e da biossíntese de ATP, na linhagem celular de fibroblastos de pulmão humano (MRC-5) tratados com H2O2. Os resultados demonstraram que o principal macronutriente presente tanto na casca quanto na polpa da jabuticaba são carboidratos. A casca apresentou maior conteúdo de fibras totais em relação à polpa. Além disso, os compostos fenólicos apresentaram-se em maior quantidade na casca da jabuticaba, sendo que a maior parte destes compostos encontrados na casca são antocianinas. A análise de espectrometria de massas do ECJ permitiu a identificação de cianidina-3-O-glicosideo, canferol, ácido hexadecanóico e ácido octadecanóico. O ECJ apresentou atividade antioxidante in vitro nos dois ensaios utilizados. Nas células MRC-5 o ECJ foi capaz de evitar significativamente a diminuição da atividade do complexo I da cadeia de transporte de elétrons e atenuou a diminuição na biossíntese de ATP induzida pelo H2O2. Concomitantemente, o ECJ foi capaz de minimizar o aumento da peroxidação lipídica, os níveis de óxido nítrico e a perda da viabilidade induzida pelo H2O2 nas células MRC-5. Estes dados mostram, pela primeira vez, a capacidade do ECJ em reduzir danos oxidativos/nitrosativos via modulação da função mitocondrial em células de mamíferos. Além disso, esses achados representam um avanço em relação ao entendimento dos mecanismos de ação dos compostos fenólicos e colaboram como uma alternativa para o desenvolvimento de possíveis tratamentos de doenças que apresentam a disfunção mitocondrial e o estresse oxidativo/nitrosativo em sua fisiopatologia.Submitted by Ana Guimarães Pereira (agpereir@ucs.br) on 2015-02-12T12:25:33Z No. of bitstreams: 1 Dissertacao Caroline Calloni.pdf: 2384035 bytes, checksum: b09d76eb830be7e315d9a2479fa5b6fc (MD5)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Jaboticaba (Plinia sp.), a native fruit from Brazil, has attracted scientific interest due to its phytonutrient content and potential health benefits, and therefore it has being considered a functional food. Studies have shown that jaboticaba is a rich source of phenolic compounds, mainly anthocyanins and flavonols. Phenolic compounds are natural products that hold important biological activities and have been reported to reduce the incidence of disease associated with oxidative and nitrosative stress in their pathophysiology, such as cardiovascular diseases, diabetes and cancer. Recent studies have shown that mitochondrial dysfunction is a key factor in development and progression of oxidative and nitrosative stress. Moreover, studies have observed the ability of phenolic compounds to modulate mitochondrial function. Thus the aim of this study was to evaluate the macronutrient composition, the total phenolic content and anthocyanins content in jaboticaba (P. trunciflora) peel and pulp. Simultaneously, it was determined the chemical composition of the jaboticaba peel extract (JPE) by mass spectrometry, and its in vitro antioxidant activity through the DPPH• and ABTS•+ assays. The ability of JPE to reduce oxidative/nitrosative stress and modulate mitochondrial function, assessed by complex I activity and ATP biossintesis, in human lung fibroblasts cells (MRC 5) challenged with H2O2 were also determined. Results evidenced that the majority of macronutrients present in both peel and pulp are carbohydrates. Jaboticaba peel showed higher fiber content than the pulp. Phenolic compounds are also present in higher quantity in the peel, and almost all phenolic compounds present in the peel are anthocyanins. Mass spectrometry analysis of the JPE allowed the identification of cyanidin-3-O-glucoside, kaempferol, hexadecanoic acid and octadecanoic acid compounds. The JPE presented in vitro antioxidant activity, through DPPH• and ABTS•+ assays. In MRC-5 cells, JPE was able to prevent the decrease in complex I activity and attenuated the decrease in ATP levels induced by H2O2. The ECJ was also able to minimize the increased in lipid peroxidation and nitric oxide levels, and prevented the cell viability loss induced by H2O2. These results show for the first time, the ability of JPE to reduce oxidative/nitrosativos damage via modulation of mitochondrial function in mammalian cells. Furthermore, these findings represent an advance over the understanding of the mechanisms of action of phenolic compounds and collaborate as an alternative for the development of potential treatments for diseases with mitochondrial dysfunction and oxidative/nitrosative stress in their pathophysiology.
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Garcia, Charlene Silvestrin Celi. « Salvia officinalis (Lamiaceae) Lin. : caracterização química, atividade citotóxica e apoptótica em células de mamíferos ». reponame:Repositório Institucional da UCS, 2014. https://repositorio.ucs.br/handle/11338/880.
Texte intégralRésumé :
Salvia officinalis (Lamiaceae), conhecida popularmente como sálvia, tem sido muito utilizada no sul do Brasil como condimento nos alimentos, tintura hidroalcoólica e chá para o tratamento de vários distúrbios de saúde. As propriedades dessa planta são estudadas por apontar possíveis mecanismos de ação antioxidante e antitumoral. Neste trabalho, o extrato hidroalcoólico e aquoso de sálvia foram analisados quimicamente por meio de cromatografia gasosa acoplada a espectrômetro de massas (GC-MS) e electrospray de alta resolução acoplada a espectrômetro de massas (ESI-QTOF MS/MS) em modo negativo. A identificação química mostrou a presença de ácidos como caféico, rosmarínico, málico, succínico, tartárico, cítrico, ursólico e compostos como luteolina-7-O-glucoronide, eucaliptol, β-tujona, β-cariofileno, α-cariofileno, α- tujona, cânfora viridiflorol, mannol, rosmanol e seus isômeros metilcarnosato e ácido 12-metoxicarnosinico. Os extratos apresentaram compostos polifenólicos com capacidade de varrer os radicais 2,2-difenil-1-picrilhidrazil (DPPH•) e 2,2’- azino-bis(3-etilbenzotiazolina-6-ácido sulfônico) (ABTS•+), além de atividade catalase (CATlike) e superóxido dismutase (SOD-like). Ambos os extratos apresentaram menor citotoxicidade em linhagens não tumorais (HeK-293 e MRC-5) e seletividade para linhagens tumorais (Hep-2, HeLa, A-549, HT-29, A-375 e HepG2). Além disso, verificou-se que o aumento do tempo de exposição ao extrato hidroalcoólico diminuiu a viabilidade em linhagens tumorais. Foram observadas alterações morfológicas por coloração de Giemsa e a avaliação da apoptose com anexina V e iodeto de propídeo mostraram a maioria das células tumorais em estágios finais do processo de apoptose e necrose após 24h de tratamento em ambos os extratos. Sugere-se que o extrato de Salvia officinalis (L.) possui atividade biológica em células tumorais, podendo ser objetivo de mais estudos com a finalidade de comprovar sua eficácia como possível agente para o tratamento do câncer.Submitted by Ana Guimarães Pereira (agpereir@ucs.br) on 2015-02-12T12:00:17Z No. of bitstreams: 1 Dissertacao Charlene Silvestrin Celi Garcia.pdf: 2151872 bytes, checksum: 7bfd73bdf5fd152982466e3f75044d21 (MD5)
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Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul, FAPERGS
Salvia officinalis (Lamiaceae), popularly known as sage, has been used in south of Brazil as a condiment in foods, as tincture and tea for the treatment various health disorders. The properties of this plant have been studied and suggest possible mechanisms of antioxidant and antitumor action. Here, the sage hydroalcoholic and aqueous extract were chemically analyzed by gas chromatography-mass spectrometry (GC-MS) and by high-resolution electrospray ionization mass spectrometry (ESI-HRMS) in negative mode. The chemical identification showed the presence of acids as caffeic, rosmarinic, malic, succinic, tartaric, citric, ursolic and compouns like luteolin-7-O-glucoronide, eucalyptol, β-thujone, β-caryophyllene, α-caryophyllenen and α-thujone, camphor, viridiflorol, mannol, rosmanol and its isomers methylcarnosate and 12-methoxycarnosinic acid. The extracts showed the content of polyphenolic compounds, ability to scavenge the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH•) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS•+), moreover catalase (CAT-like) and superoxide dismutase (SOD-like) activity. Both extracts showed lower cytotoxicity in non-tumor lines (HEK-293 and MRC-5) and selectivity for tumor cell lines (Hep-2, HeLa, A-549, HT-29, A-375 e HepG2). Furthermore, it was found that increasing the treatment exposure time of the hydroalcoholic extract decreases the tumor cell viability. Morphological changes by giemsa were observed and staining for annexin V and propidium iodide showed majority of tumor cells at late stages of the apoptotic process and necrosis after 24h treatment with both extracts. The results of this study suggest that the extract of Salvia officinalis (L.) has biological activity against tumor cell and may be the objective of further studies in order to prove its effectiveness as a possible agent for the treatment of cancer.
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Williamson, Rhett J. « Qualitative Analysis for the Characterization and Discrimination of Printing Inks ». FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/3055.
Texte intégralRésumé :
Improvements in printing technology and the wide accessibility of advanced printers has resulted in an increase in counterfeiting. Of particular interest to forensic document examiners, ink analysis of security documents has emerged as an important tool for the analysis, comparison, and association of inks to a potential production source. In this study, methods were developed for Py-GC/MS, ATR-FTIR, DART-MS, and MALDI-MS analyses of printing inks of four classes: 78 inkjet inks, 76 toners, 79 offset inks, and 86 intaglio inks in order to generate information on the organic chemical characterization of the inks to determine the ability to associate and discriminate the inks for uses in security document examinations. The suite of analytical techniques evaluated in the study focused on having the following analytical characteristics: 1) rapid analysis time, 2) little-to-no sample preparation, 3) minimal destructiveness to the sample, 4) allow for association of inks with the same source of origin as well as discrimination of inks originating from different sources. As a result of this study, a novel searchable library database of inks was developed for use with each analytical chemical method that allows for data fusion.
Py-GC/MS analysis was used to achieve >63% discrimination of toner inks on the basis of the characterization of polymer degradation products. The combination of a protocol implementing first ATR-FTIR and subsequently DART-MS analysis resulted in >96% discrimination for toners, 95% for inkjet, >92% for offset, and >54% for intaglio. In addition, a case study was performed using DART-MS to illustrate its utility as a tool for ink analysis in document examination. The results of MALDI-MS analyses from two different instruments resulted in >90% discrimination of a subset of all inks by characterizing the colorant molecules present in ink formulations. A study characterizing luminescent compounds present in the formulation of inks in crossed-line intersections was performed using a combination of MALDI-MS, LC-MS, and TLC. Overall, it was shown that the combination of analytical techniques included within this dissertation can provide information on the organic chemical composition of four classes of printing inks, which is useful for the future of document examination.
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Theophilo, Paulo Henrique Medeiros. « Qualitative Analytical Chemistry in Federal University of Cearà : a look on the Theaching using Lerarning Objects ». Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13427.
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Hà cerca de vinte anos, o pesquisador Paschoal Senise do Instituto de QuÃmica da Universidade de SÃo Paulo, ressaltava a necessidade de se refletir sobre a diferenÃa entre QuÃmica AnalÃtica e AnÃlise QuÃmica. Ele acreditava que a conscientizaÃÃo desta diferenÃa proporcionaria um maior aproveitamento da disciplina de QuÃmica AnalÃtica Qualitativa. No Brasil, esta foi introduzida nas universidades a partir de 1935, com base nos ensinamentos da chamada Escola de Rheinboldt. Em meio a esta ascensÃo, os trabalhos publicados sobre QuÃmica AnalÃtica Qualitativa, a partir dos anos sessentas, tÃm seu cunho direcionado para as atividades de ensino. Os currÃculos dos cursos universitÃrios norte-americanos reduziram a carga horÃria, outras relegando seu ensino para as atividades de laboratÃrio na disciplina de QuÃmica Geral, ou mesmo, retirando a disciplina por completo dos cursos. Tal situaÃÃo repercutiu no mundo cientÃfico e vÃrios educadores e pesquisadores, dentre eles Henry Taube, PrÃmio Nobel de QuÃmica de 1983, se manifestaram a favor da manutenÃÃo da disciplina como forma de introduzir a quÃmica descritiva e motivar os alunos a estudarem as reaÃÃes quÃmicas. A presente pesquisa evidencia a importÃncia e a situaÃÃo na qual se encontra a QuÃmica AnalÃtica Qualitativa na Universidade Federal do CearÃ. Nessa pesquisa 5 turmas foram observadas das quais duas delas foram utilizadas como turma de trabalho onde entrevistou-se 37 estudantes com objetivo de verificar a satisfaÃÃo e os problemas relacionados à disciplina em questÃo. Fez-se uma historicizaÃÃo da disciplina e traÃou-se uma anÃlise crÃtica em relaÃÃo à aplicaÃÃo da mesma nos cursos oferecidos pela Universidade Federal do CearÃ. De acordo com os resultados na fase de observaÃÃo e entrevista, fez-se uma reestruturaÃÃo do material didÃtico com o objetivo de colaborar com o professor na contextualizaÃÃo necessÃria à abordagem da tecnologia de informaÃÃo e comunicaÃÃo (CTS). Promoveu-se a confecÃÃo de objetos de aprendizagem como vÃdeos com as tÃcnicas de anÃlises, diapositivos, espectroscÃpio didÃtico e banners que facilitam a apresentaÃÃo do conteÃdo e o contextualizam. A reestruturaÃÃo proporciona maior efetividade na apresentaÃÃo, reduzindo o tempo de exposiÃÃo e melhorando o aprendizado. De acordo com as opiniÃes de discentes e docentes foi possÃvel verificar maior desenvoltura das turmas logo nas primeiras aulas. O material elaborado nÃo tem a pretensÃo de substituir o trabalho do professor ou mesmo substituir livros didÃticos, mas sim de conseguir facilitar a compreensÃo do estudante, fazendo com que o conteÃdo seja melhor apropriado pelo discente da disciplina QuÃmica AnalÃtica Qualitativa, oferecida nos cursos de Licenciatura em QuÃmica, nas categorias presenciais e semipresenciais, da Universidade Federal do CearÃ.Some twenty years, Pascoal Senise researcher at the Institute of Chemistry, University of SÃo Paulo, emphasized the need to reflect on the difference between Analytical Chemistry and Chemical Analysis. He believed that awareness of this difference would provide a better use of the discipline of Qualitative Analytical Chemistry. In Brazil, this was introduced in universities after 1935, based on the teachings of the so-called School of Rheinboldt. Amidst the rise, papers on Qualitative Analytical Chemistry, from the years sixties have its seal directed to teaching activities. The curricula of American university courses reduced workload, other relegating teaching to the lab activities in the discipline of General Chemistry, or even completely removing the discipline courses. This situation affected the scientific world and several educators and researchers, among them Henry Taube, Nobel Prize in Chemistry 1983, were in favor of maintaining discipline as a way of introducing the descriptive chemistry and motivate students to study chemical reactions. This research highlights the importance and the situation in which one finds the Qualitative Analytical Chemistry at the Federal University of CearÃ. There was a historicizing of Discipline and drew up a critical analysis regarding the application of the same courses offered by the Federal University of CearÃ. According to the results of this analysis, it is believed that a restructuring of its courseware in order to collaborate with the teacher in the context of necessary information and communication (CTS) technology approach is needed. Promoted to making videos with technical analysis, slides that facilitate the presentation of content and contextualize. The restructuring provides greater effectiveness in the presentation, reducing the exposure time and improve learning. Thus, the extra time due to the improvement in the approach can be used in discussions that promote the emergence of investigative thinking for the student to develop their creative intuition and ability necessary to Chemistry rofessional. It was possible to detect greater ease of classes in the first few lessons. The section does not pretend to replace the teacher's job or even replace textbooks, but to achieve facilitate student understanding, making the content of the course is best suitable for student discipline Qualitative Analytical Chemistry, offered in undergraduate courses in Chemistry, in the classroom and hybrid categories, the Federal University of CearÃ.
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Haraguchi, Toshio. « Análise químico-farmacêutica da buspirona ». Universidade de São Paulo, 1990. http://www.teses.usp.br/teses/disponiveis/9/9139/tde-12022015-171521/.
Texte intégralRésumé :
A buspirona, ansiolítico da segunda geração usada no tratamento de ansiedade, foi analisada fisico-quimica e quimicamente, com o objetivo de fornecer subsídios para a respectiva monografia. Fizeram-se os seguintes testes de caracterização deste fármaco: faixa de fusão, análise elementar, pH, umidade e solubilidade. Realizaram-se igualmente as provas de identificação constante de: análise cromatográfica, ensaio de cloreto, espectro no infravermelho, espectro no ultravioleta, espectro de ressonância magnética protônica, espectro de massa, espectro de carbono-13, termogravimetria, calorimetria exploratória diferencial e cromatografia líquida de alta resolução. Efetuaram-se, também, determinações quantitativas pelos seguintes métodos: micro-Kjeldahl, gravimétrico, potenciométrico com nitrato de prata, doseamento com ácido perclórico em meio acetico por volumetria e potenciometria e espectrofotométrico no ultravioleta. Concluiu-se que: 1) o teste de caracterização mais indicado e o ponto de fusão; 2) das provas de identificação, as mais simples e rápidas são as seguintes: identificação de cloreto, infravermelho e ultravioleta; 3) dos métodos de determinação quantitativa, mais prático e o doseamento com ácido perclórico em meio acético, usando como indicador o vermelho de quinaldina.Buspirone, a new non-benzodiazepine anxiolytic agent which is effective in the treatment of anxiety, was analyzed by physicochemical and chemical methods, having in mind a monograph of this drug. The fo1lowing characterization tests of this drug were performed: melting range, elementary analysis, pH, loss in drying, solubility. The following identification tests were also carried out: chromatographic analysis, identification of chloride, infrared absorption, ultraviolet absorption, protonic magnetic resonance spectra, mass spectrum, carbon 13C NMR spectroscopy, thermogravimetry and high performance liquid chromatography. Quantitative determinations were obtained through the following methods: micro-Kjeldahl, gravimetry, potenciometry, non-aqueous titration with perchloric acid and ultraviolet spectrometry. The following conclusions were reached: 1) the best characterization test is the melting range; 2) the simplest and quickest tests of identification are: identification of chloride, infrared and ultraviolet spectrophotometry; 3) the most practical method is the non-aqueous assay with perchloric acid.
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Smith, Kerri M. « Quantitative and qualitative mass spectrometric analysis of anticancer agents, drugs of abuse and enzyme-inhibitor complexes ». Cleveland State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=csu1373987824.
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Calefi, Roberta Maura. « Ensino de química analítica qualitativa na graduação : sua importância e metodologias adotadas ». Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-26072010-101443/.
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Um estudo sobre alguns aspectos relacionados ao ensino de Química Analítica Qualitativa no Brasil é apresentado, com o objetivo de oferecer subsídios para discussão sobre a importância e as formas de se trabalhar o conteúdo dessa disciplina em nosso país. Inicialmente, foi feito um levantamento dos aspectos históricos da análise qualitativa, sua introdução e desenvolvimento no ensino superior brasileiro, com destaque ao seu introdutor, o Prof. Heinrich Rheinboldt, a autores nacionais que se ocuparam do assunto, como o Prof. Paschoal Senise (e seus seguidores) e às pesquisas desenvolvidas em nosso país, por Fritz Feigl. Também foi enviado um questionário com 11 perguntas sobre diversos aspectos da disciplina, dirigidas a 134 docentes responsáveis por ministrar Química Analítica Qualitativa em 75 Instituições de Ensino Superior, tanto públicas como particulares, abrangendo todo o território nacional. As questões tinham o objetivo de avaliar a importância dada à disciplina, seu conteúdo e formas de apresentação pelo país. Destes, apenas 20 responderam e suas respostas foram compiladas e analisadas sob diversos aspectos. Como última parte do trabalho foi feita uma resenha das principais metodologias de ensino experimental da Química Analítica Qualitativa, tendo como base os principais livros-texto, citados pelos professores no questionário. Também foram incluídas algumas propostas de metodologia nas quais se evita o uso do controverso sulfeto de hidrogênio. A principal conclusão é que há uma divergência profunda de opiniões sobre a apresentação da disciplina quanto à sua forma e carga horária, porém com certa convergência quanto ao conteúdo. Entretanto, a maioria dos professores que responderam ao questionário, concordou com a importância da disciplina na formação do estudante de química.A study of some aspects considered relevant, concerning the teaching of Qualitative Chemical Analysis in Brazil is presented, looking for subsidy discussions on the importance and approaches of teaching this discipline. Initially historical aspects of the Qualitative Analysis as well as its introduction in our country is presented emphasizing its introducer Prof. Heinrich Rheinboldt and Brazilian authors that concerned on the subject as Prof. Paschoal Senise (and his students) and the research developed here by Fritz Feigl in the last century. A questionary with 11 questions about several aspects of the discipline was sent out to 134 teachers responsible by teaching Qualitative Chemical Analysis in 75 universities and colleges (state and private) all around the country. The questions had the goal of evaluating the importance attributed to the contents and didactical approach used in the discipline. Only 20 answers were received back and their contents were compiled and analyzed under several aspects. As the last part of the work a summary of the main experimental teaching approaches of Qualitative Chemical Analysis based on the text-books mostly cited in the answers to the questionary is presented together with some propositions from the literature that avoid the use of the controversial hydrogen sulphide. The main conclusion is that there is a deep divergence about how to present the contents of the discipline concerning the teaching approach and the time dedicated to the subject with certain agreement in relation to the contents. However, the majority of the teachers that attempt the questionary agreed with the importance of Qualitative Chemical Analysis in the formation of the chemistry student.
Livres sur le sujet "Qualitative Analytic Chemistry"
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Vogel, Arthur Israel. Vogel's qualitative inorganic analysis. 6e éd. Harlow, Essex, England : Longman Scientific & Technical, 1987.
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D, Odom Jerome, et Holtzclaw Henry Fuller 1921-, dir. General chemistry with qualitative analysis. Boston : Houghton Mifflin, 1997.
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Petrucci, Ralph H. General chemistry with qualitative analysis. 2e éd. New York : Macmillan, 1987.
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G, Svehla, dir. Vogel's qualitative inorganic analysis. 7e éd. Harlow : Longman, 1996.
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K, Wismer Robert, dir. General chemistry with qualitativeanalysis. 2e éd. New York : Macmillan, 1987.
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L, Masterton William. Chemical principles with qualitative analysis. Philadelphia : Saunders College Pub., 1986.
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1903-, Caldwell William Elmer, et Epstein Lawrence M, dir. Semimicro qualitative analysis. Belmont, Calif : Wadsworth Pub., 1986.
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Chasteen, Thomas G. Qualitative and instrumental analysis of environmentally significant elements. New York : Wiley, 1993.
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Qualitative organic analysis : Spectrochemical techniques. 2e éd. London : McGraw-Hill, 1986.
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1899-, Sorum C. H., dir. Introduction to semimicro qualitative analysis. 8e éd. Upper Saddle River, N.J : Pearson Prentice Hall, 2004.
Trouver le texte intégralChapitres de livres sur le sujet "Qualitative Analytic Chemistry"
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Valcárcel, Miguel. « Qualitative Aspects of Analytical Chemistry ». Dans Principles of Analytical Chemistry, 201–45. Berlin, Heidelberg : Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-57157-2_5.
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Valcárcel Cases, Miguel, Ángela I. López-Lorente et M. Ángeles López-Jiménez. « Qualitative Analytical Processes ». Dans Foundations of Analytical Chemistry, 233–72. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62872-1_6.
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Burgot, Jean-Louis. « Some Applications of Redox Reactions in Qualitative Analysis ». Dans Ionic Equilibria in Analytical Chemistry, 405–19. New York, NY : Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-8382-4_21.
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Schulz, Hartwig. « Qualitative and Quantitative FT-Raman Analysis of Plants ». Dans Challenges and Advances in Computational Chemistry and Physics, 253–78. Dordrecht : Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7832-0_9.
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Burgot, Jean-Louis. « Some Applications of the Precipitation Phenomenon in Inorganic and Organic Qualitative and Quantitative Analysis ». Dans Ionic Equilibria in Analytical Chemistry, 721–41. New York, NY : Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-8382-4_39.
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Bley, K., et I. Ugi. « Computer — Assisted Analysis of Qualitative Structure/Activity Relations of Organic Molecules ». Dans Software Development in Chemistry 4, 67–73. Berlin, Heidelberg : Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75430-2_8.
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Tan, Kim Chwee Daniel. « Using Inquiry to Facilitate Meaningful Learning in Inorganic Chemistry Qualitative Analysis ». Dans Education Innovation Series, 211–26. Singapore : Springer Singapore, 2014. http://dx.doi.org/10.1007/978-981-4585-78-1_11.
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Ziegler, Tom, Vincenzo Tschinke et Louis Versluis. « Quantitative Results and Qualitative Analysis by the Hartree-Fock-Slater Transition State Method ». Dans Quantum Chemistry : The Challenge of Transition Metals and Coordination Chemistry, 189–98. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4656-9_14.
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Kharitonov, Yu Ya. « Analytical Chemistry. Analytics 1. General Theoretical Foundations. Qualitative Analysis ». Dans Analytical Chemistry. Analytics 1. General Theoretical Foundations. Qualitative Analysis, 1–688. 7e éd. OOO «GEOTAR-Media» Publishing Group, 2022. http://dx.doi.org/10.33029/9704-6183-9-ach1-2022-1-688.
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Kharitonov, Yu Ya. « Analytical Chemistry. Analytics 1. General Theoretical Foundations. Qualitative Analysis ». Dans Analytical Chemistry. Analytics 1. General Theoretical Foundations. Qualitative Analysis, 1–608. OOO «GEOTAR-Media» Publishing Group, 2021. http://dx.doi.org/10.33029/9704-5978-2-ach1-2021-1-608.
Texte intégralActes de conférences sur le sujet "Qualitative Analytic Chemistry"
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Guerrero, Gloria Edith, Cesar Augusto Jaramillo et Carlos Augusto Meneses. « Mmacutp : Mobile application for teaching analytical chemistry for students on qualitative analysis ». Dans 2016 International Conference on Interactive Mobile Communication, Technologies and Learning (IMCL). IEEE, 2016. http://dx.doi.org/10.1109/imctl.2016.7753770.
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Romero, Vanesa, Isela Lavilla, Inmaculada de la Calle, Francisco Pena et Carlos Bendicho. « QUALITATIVE ANALYTICAL CHEMISTRY IN A CRIME SCENE : A MEANS OF INCREASING STUDENTS' INTEREST ». Dans 14th International Conference on Education and New Learning Technologies. IATED, 2022. http://dx.doi.org/10.21125/edulearn.2022.0592.
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Pinasti, Titen, Ahmad Mudzakir et Hernani. « Can the chemistry of rare earth elements enhance student's system thinking ? A qualitative content analysis ». Dans PROCEEDING OF INTERNATIONAL CONFERENCE ON FRONTIERS OF SCIENCE AND TECHNOLOGY 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0102636.
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Pois, P. D., et W. G. M. Agterof. « Qualitative and Quantitative Analysis by High-Performance Liquid Chromatography of Synthetic Alkylaryl Sulfonates : Surfactants for Potential Application in Enhanced Oil Recovery ». Dans SPE Oilfield and Geothermal Chemistry Symposium. Society of Petroleum Engineers, 1985. http://dx.doi.org/10.2118/13571-ms.
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A., Manjunath, Ashwini A., Mahalesh Devandrappa, Balaji Biradar, Mohanraj Pattar et B. R. Kerur. « Qualitative analysis of pharmaceutical drugs by x-ray transmission method : A non-destructive technique ». Dans PROF. DINESH VARSHNEY MEMORIAL NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS : NCPCM 2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5098668.
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Kundu, Prithwish, Muhsin M. Ameen, Chao Xu, Umesh Unnikrishnan, Tianfeng Lu et Sibendu Som. « Implementation of Detailed Chemistry Mechanisms in Engine Simulations ». Dans ASME 2017 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icef2017-3596.
Texte intégralRésumé :
The stiffness of large chemistry mechanisms has been proved to be a major hurdle towards predictive engine simulations. As a result, detailed chemistry mechanisms with a few thousand species need to be reduced based on target conditions so that they can be accommodated within the available computational resources. The computational cost of simulations typically increase super-linearly with the number of species and reactions. This work aims to bring detailed chemistry mechanisms within the realm of engine simulations by coupling the framework of unsteady flamelets and fast chemistry solvers. A previously developed Tabulated Flamelet Model (TFM) framework for non-premixed combustion was used in this study. The flamelet solver consists of the traditional operator-splitting scheme with VODE (Variable coefficient ODE solver) and a numerical Jacobian for solving the chemistry. In order to use detailed mechanisms with thousands of species, a new framework with the LSODES (Livermore Solver for ODEs in Sparse form) chemistry solver and an analytical Jacobian was implemented in this work. Results from 1D simulations show that with the new framework, the computational cost is linearly proportional to the number of species in a given chemistry mechanism. As a result, the new framework is 2–3 orders of magnitude faster than the conventional VODE solver for large chemistry mechanisms. This new framework was used to generate unsteady flamelet libraries for n-dodecane using a detailed chemistry mechanism with 2,755 species and 11,173 reactions. The Engine Combustion Network (ECN) Spray A experiments which consist of an igniting n-dodecane spray in turbulent, high-pressure engine conditions are simulated using large eddy simulations (LES) coupled with detailed mechanisms. A grid with 0.06 mm minimum cell size and 22 million peak cell count was implemented. The framework is validated across a range of ambient temperatures against ignition delay and liftoff lengths. Qualitative results from the simulations were compared against experimental OH and CH2O PLIF data. The models are able to capture the spatial and temporal trends in species compared to those observed in the experiments. Quantitative and qualitative comparisons between the predictions of the reduced and detailed mechanisms are presented in detail. The main goal of this study is to demonstrate that detailed reaction mechanisms (∼1000 species) can now be used in engine simulations with a linear increase in computation cost with number of species during the tabulation process and a small increase in the 3D simulation cost.
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Fhaner, Matthew. « Implementation of Green Solvents to Monitor Thermal Oxidation of Common Frying Oils ». Dans 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/hvza2523.
Texte intégralRésumé :
Developing simple, fast, and user-friendly methods for monitoring frying oil oxidation has resulted in novel advances in recent years. Current instrumentation and methodologies in this field offer various benefits, but there are few truly quantitative methods for assessing frying oil quality. One analytical method that continues to garner attention is electrochemistry. One of the reasons is the direct quantitative relationship between analytical signal and sample concentration. The direct stoichiometric relationship between electrons and an analyte undergoing reduction or oxidation is a predictable relationship between measured charge (Coulombs) and mols of analyte. To this extent, our group has focused on investigating the use of electrochemical methods for the assessment of antioxidant and lipid degradation. Following two of the twelve principles of green chemistry, our group identified less hazardous solvent systems for the analysis of antioxidants. After identifying potential solvent candidates, our efforts have shifted to evaluating green solvents for the analysis of lipids. Our advancements in solvent options yield the potential for transferring our methods to industry settings such as restaurants and food manufactures with minimal safety risks to the user. Current research utilizes square-wave voltammetry to monitor fatty acid degradation in vegetable, canola, peanut, and safflower oils. In this presentation, voltametric signals (oxidation peak currents, fatty acid–oxidation peak identification, and figures of merit) will be compared against complimentary analytical techniques such as FAME analysis via GC-MS and peroxide value analysis. Preliminary results verify previously reported studies that demonstrate common frying oils produce unique voltametric traces that can be used for qualitative analysis in addition to oxidation peak currents varying with oil concentration and thermal exposure respectively.
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Meschian, Moe, Andy Duncan, Matt Yarmuch et Fred Myschuk. « An Investigation on Microstructural Evolution of X70 Steel Pipe During Hot Induction Bending ». Dans 2018 12th International Pipeline Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipc2018-78018.
Texte intégralRésumé :
It is generally accepted that hot induction bending (HIB) results in a decrease in strength and an increase in fracture toughness in bend area, heat affected zone (HAZ) and weld metal (WM). As the result, Post bend heat treatment (PBHT) is not considered to be a requirement and could be waived for saving money and time. This research work raises the concern that factual verification of proper microstructure and no localized brittle zone is vitally necessary prior to waving PBHT. Evaluation of the steel microstructure and mechanical properties as the result of various pipe chemistries during pipe bending has been verified in this experimental work. It is emphasized that knowledge and control of prior steel pipe chemistry, control of temperature, cooling rate and bending speed assures the reliability and repeatability of induction bends, especially in critical environments such as low temperature application. In the present work, qualitative and quantitative microstructural analysis, hardness and impact test performed and evaluated on samples from X70 line pipe with 3 different steel chemistries. The samples prepared from different locations on body, weld and HAZ in the as received and as bent condition. It was found that the final microstructure and mechanical properties in the as bent condition is dependent on the chemistry, steel cleanliness and microstructural uniformity. It was observed that small localized brittle zone with traces of upper Bainite and Martensite islands could be transformed in the microstructure with rich chemistry containing non-homogenous central segregation. It is concluded that factual verification of proper microstructure with no localized hard zone is required prior to waving PBHT.
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Di Domenico, Massimiliano, Peter Gerlinger et Manfred Aigner. « Numerical Investigation of Soot Formation in Laminar Ethylene-Air Diffusion Flames ». Dans ASME Turbo Expo 2007 : Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27118.
Texte intégralRésumé :
In this work a new soot formation model is used to predict temperature, species and soot concentrations in laminar ethylene-air diffusion flames. The gas-phase chemistry is described by elementary reactions with transport equations solved for any species. The chemical paths yielding to soot are modeled by a sectional approach for Polycyclic Aromatic Hydrocarbons (PAHs). Soot dynamics is described by a two-equation model for soot mass fraction and particle number density. Phenomena like nucleation, growth and oxidation have been included both for PAHs and soot. Moreover, PAH-PAH and PAH-soot collisions are taken into account. Species, PAH and soot transport equations are implemented in the in-house DLR-THETA CFD code. The laminar, ethylene-air diffusion flame investigated experimentally by McEnally and coworkers (2000) is simulated in order to validate the model. An analysis of the main flame’s features as well as the interaction between them and the soot chemistry will be given. A qualitative correlation between local stoichiometric values and soot formation rate is assessed. In order to study the sensitivity of the combustion model to simulation parameters like the inlet temperature and kinetic mechanism, additional simulations are performed. Results are also compared with experimental data in terms of temperature, species mole fractions and soot volume fraction axial profiles.
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Niksa, Stephen, Gui-Su Liu, Larry G. Felix et P. Vann Bush. « Advanced CFD Post-Processing for Pulverized Fuel Flame Structure and Emissions ». Dans 2002 International Joint Power Generation Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ijpgc2002-26136.
Texte intégralRésumé :
The simulation strategy described in this paper provides an alternative to conventional CFD post-processing to estimate exhaust NOX emissions. The method first analyzes a CFD furnace simulation to specify temperature histories and mixing rates. Then the bulk flow patterns are represented with an equivalent network of idealized reactor elements. Detailed reaction mechanisms are then applied over the reactor network, including the most fully validated reaction mechanisms for coal devolatilization and char oxidation and complete elementary reaction mechanisms for chemistry in the gas phase and in soot. The analysis predicted the NOX emissions from 1.7 MWt pilotscale flames of coal and coal/biomass blends within experimental uncertainty over a broad range of O2 concentrations, with and without staging. The predicted unburned carbon emissions were qualitatively correct, but char reactivity parameters would need to be specified in a one-point calibration for quantitative predictions. The analysis also characterized distinctive chemistry within the flame core, a mixing layer for secondary air entrainment, an overfire air zone, and a char burnout zone. The main practical benefit of the mechanistic complexity is that simulations based on detailed mechanisms require fewer parameter adjustments than CFD simulations whenever different fuels are considered.
Rapports d'organisations sur le sujet "Qualitative Analytic Chemistry"
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Nechypurenko, Pavlo P., Viktoriia G. Stoliarenko, Tetiana V. Starova, Tetiana V. Selivanova, Oksana M. Markova, Yevhenii O. Modlo et Ekaterina O. Shmeltser. Development and implementation of educational resources in chemistry with elements of augmented reality. [б. в.], février 2020. http://dx.doi.org/10.31812/123456789/3751.
Texte intégralRésumé :
The purpose of this article is an analysis of opportunities and description of the experience of developing and implementing augmented reality technologies to support the teaching of chemistry in higher education institutions of Ukraine. The article is aimed at solving problems: generalization and analysis of the results of scientific research concerning the advantages of using the augmented reality in the teaching of chemistry, the characteristics of modern means of creating objects of augmented reality; discussion of practical achievements in the development and implementation of teaching materials on chemistry using the technologies of the augmented reality in the educational process. The object of research is augmented reality, and the subject - the use of augmented reality in the teaching of chemistry. As a result of the study, it was found that technologies of augmented reality have enormous potential for increasing the efficiency of independent work of students in the study of chemistry, providing distance and continuous education. Often, the technologies of the augmented reality in chemistry teaching are used for 3D visualization of the structure of atoms, molecules, crystalline lattices, etc., but this range can be expanded considerably when creating its own educational products with the use of AR-technologies. The study provides an opportunity to draw conclusions about the presence of technologies in the added reality of a significant number of benefits, in particular, accessibility through mobile devices; availability of free, accessible and easy-to-use software for creating augmented-reality objects and high efficiency in using them as a means of visibility. The development and implementation of teaching materials with the use of AR-technologies in chemistry teaching at the Kryvyi Rih State Pedagogical University has been started in the following areas: creation of a database of chemical dishes, creation of a virtual chemical laboratory for qualitative chemical analysis, creation of a set of methodical materials for the course “Physical and colloidal chemistry”.
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Neyedley, K., J. J. Hanley, Z. Zajacz et M. Fayek. Accessory mineral thermobarometry, trace element chemistry, and stable O isotope systematics, Mooshla Intrusive Complex (MIC), Doyon-Bousquet-LaRonde mining camp, Abitibi greenstone belt, Québec. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328986.
Texte intégralRésumé :
The Mooshla Intrusive Complex (MIC) is an Archean polyphase magmatic body located in the Doyon-Bousquet-LaRonde (DBL) mining camp of the Abitibi greenstone belt, Québec, that is spatially associated with numerous gold (Au)-rich VMS, epizonal 'intrusion-related' Au-Cu vein systems, and shear zone-hosted (orogenic?) Au deposits. To elucidate the P-T conditions of crystallization, and oxidation state of the MIC magmas, accessory minerals (zircon, rutile, titanite) have been characterized using a variety of analytical techniques (e.g., trace element thermobarometry). The resulting trace element and oxythermobarometric database for accessory minerals in the MIC represents the first examination of such parameters in an Archean magmatic complex in a world-class mineralized district. Mineral thermobarometry yields P-T constraints on accessory mineral crystallization consistent with the expected conditions of tonalite-trondhjemite-granite (TTG) magma genesis, well above peak metamorphic conditions in the DBL camp. Together with textural observations, and mineral trace element data, the P-T estimates reassert that the studied minerals are of magmatic origin and not a product of metamorphism. Oxygen fugacity constraints indicate that while the magmas are relatively oxidizing (as indicated by the presence of magmatic epidote, titanite, and anhydrite), zircon trace element systematics indicate that the magmas were not as oxidized as arc magmas in younger (post-Archean) porphyry environments. The data presented provides first constraints on the depth and other conditions of melt generation and crystallization of the MIC. The P-T estimates and qualitative fO2 constraints have significant implications for the overall model for formation (crystallization, emplacement) of the MIC and potentially related mineral deposits.