Detection of chemicals is a vital part of chemistry. For this reason, many detection systems are developed by scientists and every detection system has its own advantages. Raman spectroscopy is one of these detection systems having many advantages. However, this technique suffers from low signal intensity disadvantage. By developing a well prepared substrate, this problem can be easily solved / moreover, even single molecule detection can be possible. In this study, a novel surface enhanced Raman scattering (SERS) substrate was prepared in two steps: In the first step, ethylenedioxythiophene (EDOT) monomer was polymerized electrochemically onto indium tin oxide (ITO) coated glass. In the next step, silver ions were reduced electrochemically onto surface prepared in the previous step.In the substrate preparation part, the reduction potential of silver ion, the concentration of silver ions in solution, the polymer film thickness and reduced silver amount on substrates were optimized to get the best SERS performances from substrates. The prepared substrates were characterized by cyclic voltammetry (CV), ultraviolet-visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) attached to SEM. In the SERS performance investigation part, homogeneity and the shelf life of the prepared silver-PEDOT substrates were tested. Homogeneity is very important in terms for the applications of Raman technique in quantitative analysis since most of the reported substrates are lack homogeneity consideration, our study will be an important contribution to the literature. The stability of the substrate was investigated for a period of one month. The very small change in the signal at the end of one month indicated that the substrate can be used even longer time with high efficiency. In all the studies, brilliant cresyl blue (BCB) is used as a model compound. Some important Raman active chemicals, namely, rhodamine 6G (R6G) and 4-mercapto benzoic acid (4-MBA) were detected by using the prepared substrates.

Silver is a precious metal having antibacterial property and widely used in industry mostly for water purification and medicinal products. Therefore, the determination of trace levels of silver is important for industrial applications. Flame atomic absorption spectrometry (FAAS) is a popular technique for the determination of relatively low concentration levels. This mature technique owes its widespread application to its simplicity and low cost. However, for some occasions, FAAS technique suffers from its low sensitivity because of low nebulization efficiency and relatively short residence time of analyte atoms in the measurement zone. In order to overcome this sensitivity problem, atom traps have been developed in recent years. Slotted quartz tube (SQT) is an accessory designed to use as an atom trap in conventional flame atomic absorption burner head. This thesis study involves the development of a sensitive, simple and economical technique with the help of the SQT for the determination silver. Firstly, the technique known as SQT-FAAS was used to increase the residence time of analyte atoms in the measurement zone. In this case, limit of detection (LOD) and characteristic concentration (C0) values were found to be 19 ng/mL and 35 ng/mL, respectively. Enhancement in sensitivity with respect to FAAS was found to be 2.31 fold using SQT-FAAS. Regarding the angle between the two slots of the SQT, 180&deg / configuration was used. Secondly, in order to improve sensitivity further, the SQT was used as an atom trap (AT) where the analyte is accumulated in its inner wall prior to re-atomization. The signal is formed after reatomization of analyte atoms on the trap surface by introduction of organic solvent. For this purpose, uncoated SQT was used as a trap medium. However, there was a memory effect. Therefore, the SQT inner surface was coated with different coating elements and theoptimum conditions were found by using W-coated SQT-AT-FAAS technique. In the presence of a lean air-acetylene flame, analyte atoms were trapped in the inner surface of the SQT for 5.0 min and then revolatilized with the introduction of 25 &mu / L isobutyl methyl ketone (IBMK) / afterwards, a transient signal was obtained. These optimized parameters were used for uncoated SQT, W-coated SQT and Zr-coated SQT atom trap techniques. Sample suction rate was 6.25 mL/min in all techniques. Sensitivity was increased 54 fold using uncoated SQT-AT-FAAS technique with respect to simple FAAS technique. When W-coated SQT-AT-FAAS technique was applied, 135 fold sensitivity enhancement was obtained with respect to FAAS technique. The best sensitivity enhancement, 270 fold, was obtained using Zr-coated SQT-AT-FAAS technique. In addition, the Ag signals were more reproducible (%RSD, 1.21) when Zr was used as a coating element. After the sensitive technique was developed, interference effects of some transition and noble metals and hydride forming elements on Ag signals were investigated. Finally, surface studies were done to determine the chemical state of Ag during trapping period by using X-ray Photoelectron Spectroscopy (XPS). It was observed that the Ag analyte is retained on the SQT surface in its oxide form.

Hydride generation technique is frequently used for the detection of elements as As, Se, Sb, Sn, Bi, Ge, Te and Pb that form volatile hydrides in solution using a reductant. In this study, a novel quartz trap for on-line preconcentration of volatile analyte species was designed. Pb, Sb and Cd were selected as analyte elements and chemical vapour generation technique was employed for generation of their volatile species in flow systems. The trapping medium was formed by external heating of either the inlet arm of the quartz tube atomizer or a separate cylindirical quartz tube. Generated analyte species were trapped on quartz surface heated to the collection temperature and the collected species were revolatilized when the trap was heated further to releasing temperature and hydrogen gas was introduced in the trapping medium. The conventional quartz T-tube and multiple microflame quartz tube were employed as atomizers. The influence of relevant experimental parameters on the generation, collection and revolatilization efficiencies was investigated. Optimum conditions, performance characteristics of the trap and analytical figures of merit are presented. Experimental design was used for optimizations in some cases. Standard reference materials were analyzed to assess the accuracy of the proposed method. For a collection period of 1.0 minute for Pb, 2.0 minutes for Sb and 3.0 minutes for Cd, 3&amp / #963 / limit of detections, in pg ml-1, were 19, 3.9 and 1.8, respectively. In cases of Sb and Cd, the limits of detections obtained are the same as the best attained with in-situ trapping in graphite furnaces.

Vapor generation in atomic spectrometry is a well established technique for the determination of elements that can be volatilized by chemical reactions. In-situ trapping in graphite furnaces is nowadays one of the most popular methods to increase the sensitivity. In this study, resistively heated W-coil was used as an online trap for preconcentration and revolatilization of volatile species of Bi, Cd and Pb. The collected analyte species were revolatilized rapidly and sent to a quartz Ttube atomizer for AAS measurement. Although the nature of revolatilized species of Bi and Pb are not clear, they are probably molecular since they can be transported at least 45 cm without any significant decrease in the peak height values. However, cadmium is revolatilized from the trap surface as atoms. The experimental parameters were optimized for the highest vapor generation, trapping and revolatilization efficiencies. The concentration limits of detection calculated by the 3 of blank solution were found to be 0.0027, 0.0040 and 0.015 ng/mL for Bi (18 mL), Cd (4.2 mL) and Pb (2 mL), respectively / enhancement factors in the sensitivity were 130, 31 and 20, respectively. These values are comparable with those obtained by in-situ trapping in graphite furnaces or even ICP-MS found in the literature or better. Sensitivity can be improved further for Bi and Cd using larger sample volumes, but purification of blank is required for Pb. Certified standard reference materials were analyzed for the assessment of accuracy of developed method.

A method for determination of silver has been developed based on chemical vapour generation atomic absorption spectrometry (CVGAAS). Volatile species of silver in acidified medium were generated by the reduction of sodium tetrahydroborate / these species were sent to a flame-heated quartz tube atomizer (QTA) following isolation by using a gas-liquid separator. Flow injection (FI) was used for sample introduction. Optimization of parameters such as / concentrations of acid and NaBH4 concentration, flow rates of solutions and carrier gas were made. The influences of the well-known chemical modifier, Pd, and the effect of diethyldithiocarbomate (DDTC) were also examined. Interference study has been carried out for Ni(II), Co(II), Cu(II), Fe(III), Au(III), As(III), Pb(II), Se(IV) and Sn(II) . A detection limit of 7.5 ng mL-1 (n=11) was obtained with a 0.2 mL sample volume. With the FI-CVGAAS system 5.6 times sensitivity enhancement was achieved over flame atomic absorption spectrometry (FAAS).

No description available.

L’enjeu principal de cette recherche consiste à démontrer qu’il y a une pensée spécifique du sujet chez Kant. L’auteur repère le fondement de la subjectivité kantienne dans l’acte libre de se donner la loi. La loi éthique, c’est la loi que je me donne moi-même. Et pourtant, la loi est l’impératif qui s’adresse au moi à la deuxième personne : la loi s’adresse au moi comme l’impératif « tu dois ». En tant qu’impératif, la loi se présente comme ce qui m’est donné, et je me conçois comme celui qui est posé devant la loi. Cela veut dire que je m’éprouve, en me soumettant à la loi, comme un «toi » à qui la loi s’adresse, et que la loi apparaît comme provenant de l’autre ou du dehors. Ne peut-on pas alors dire que je me donne la loi comme si j’obéissais à la loi de l’autre qui m’appelle à la deuxième personne ? Ou bien, comme si je traitais comme un autre mon moi qui obéit à la loi ? Par l’autre, l’auteur pense à l’altérité interne dans l’acte d’auto-détermination par la loi. Bien que le moi n’a affaire qu’à lui-même dans l’auto-détermination par la loi, l’autre intervient dans la relation du moi qui donne la loi et du moi qui obéit. L’ipséité du moi constitue ainsi l’épreuve de l’altérité du moi. Que je m’éprouve dans l’auto-détermination par la loi, c’est cette épreuve de soi que l’auteur a essayé d’élucider avec Kant. / The purpose of this research aims at demonstrating that there is a specific conception of the Self in Kant. According to the author, the fundamental of the subjectivity in Kant can be found in the free will acting under the law that it gives to itself. For Kant the moral law is the law I give to myself. Nevertheless, the law is understood as an imperative that I give to myself by using the second person, that is to say that one is addressed by the moral law under the imperative form " you must ". It means that I consider myself as the "you" to whom the law is addressed. To me, the law is an imperative addressed by the other person, that is to say an imperative coming from outside. Thus, it might be possible to consider that when I give to myself the law it is the same as if I obey the other law, which is addressed to me with the second person? Or, shall we say that I consider myself as the other person who obeys the law? By the term “the other”, the author means the internal otherness existing in the action of self-determination resulting from the law. This is related to the question of identifying the enlightenment of the other’s status, which is involved in the action of self- determination given by the law. Although I have to deal with myself in the self-determination given by the law, the other is involved in the relation that opposes myself, when I give to myself the law, to me as the subject who obeys the law. The subjectivity might be interpreted as the test of the otherness existing in the Self. The fact that I consider myself as “the other” in the self-determination given by the law, can be seen as the test of the otherness existing in the Self and this is what the author aims at clarifying based on his works on Kant’s thoughts.

Dans la pensée contemporaine (tous domaines confondus), le traditionnel problème du fondement a disparu. Et cela à juste titre : les plus importants résultats aujourd’hui ont été obtenus, en effet, sans passer par une hypostase méthodologique que le concept de « fondement » impose à la pensée. La phénoménologie, plus que toute autre approche, semble avoir accompli ce processus ; pour ce faire, cependant, elle a gardé un vocabulaire souvent ambigu ; voire, elle s’est réclamée expressément comme étant au fondement des sciences. Notre travail trouve son point de départ, dans la philosophie d’inspiration phénoménologique de Michel Henry. Elle permet de penser un fondement sans passer par la violence d’un maître-mot, et simultanément sans passer par le dogme d’une théorie où le fondement porterait à une réaffirmation des dualismes, lui-même hypostasié (comme « être » par exemple). Pour Henry, le fondement, comme ce qui est sans condition, est l’apparaître de quelque chose. À son tour, il se dit comme une condition absolue de tout ce qui se manifeste, comme une force de manifestation de l’être. Mais le chemin vers un fondement s’avère difficile, puisqu’il n’existe pas de thématisation de ce concept chez Henry, ni de possibilité de « concept » de fondement dans le « dire le phénomène », dans un langage qui doit, pour se dire fondamental, exprimer l’immédiateté de la manifestation en tant que telle, une manifestation qui se dise elle-même sans avoir recours à une référence externe. Peu importe la manière, le fondement doit lui-même bâtir sa propre problématique. Le phénomène du fondement représente, à travers un parcours aux limites de la philosophie, à la fois théorétique, empirico-transcendantale et expérimental, la tentative de penser le fondement comme ce qui se manifeste et, sans médiation, manifeste une altérité finalement comprise à partir d’une immanence irréductible. / In contemporary thinking (all fields included), the traditional problem of the foundation has disappeared. Rightfully: the most important results today have been obtained, in fact, without going through a methodological hypo-stasis that the concept of “foundation” imposes to the thought. Phenomenology, more than any other approach, seems to have been through this process ; for doing so, however, it kept a vocabulary often ambiguous ; it even claimed it specifically as the foundation of science. Our work finds its starting point, in the phenomenological philosophy of Michel Henry. It suggests a basis without going through the violence of a master word, and simultaneously bypassing the dogma of a theory in which the foundation would be a reaffirmation of dualism, itself an hypo-stasis (as the "being", for example). For Henry, the foundation, understood as what is unconditional, is the appearing of something. Thus he says as an absolute condition that manifests itself as a force of manifestation of being. But the path to one foundation is difficult, since there is no theming of this concept in Henry, and no possibility of “concept” basis in the “to say the The phenomenon of foundation. Essay on the philosophy of Michel Henry.In contemporary thinking (all fields included), the traditional problem of the foundation has disappeared. Rightfully: the most important results today have been obtained, in fact, without going through a methodological hypo-stasis that the concept of “foundation” imposes to the thought. Phenomenology, more than any other approach, seems to have been through this process ; for doing so, however, it kept a vocabulary often ambiguous ; it even claimed it specifically as the foundation of science. Our work finds its starting point, in the phenomenological philosophy of Michel Henry. It suggests a basis without going through the violence of a master word, and simultaneously bypassing the dogma of a theory in which the foundation would be a reaffirmation of dualism, itself an hypo-stasis (as the "being", for example). For Henry, the foundation, understood as what is unconditional, is the appearing of something. Thus he says as an absolute condition that manifests itself as a force of manifestation of being. But the path to one foundation is difficult, since there is no theming of this concept in Henry, and no possibility of “concept” basis in the “to say the phenomenon”, in a language that has, to say fundamental, to express the immediacy of the event as such, an event which tells itself without using an external reference. Anyway, the foundation itself must build its own problems. The phenomenon is the basis, through a journey to the limits of philosophy, theoretical, empirico-transcendental and experimental, trying to understand of the foundation as what is manifest and without mediation, manifest otherness finally understood from an irreducible immanence.

Social science is in crisis. The task of social science is to study “man in situation”: to understand the world as it is for “man”. This thesis charges that this crisis consists in a failure to properly address the philosophical anthropological question “What is man?”. The various social scientific methodologies who have as their object “man” suffer rampant disagreements because they presuppose, rather than consider, what is meant by “man”. It is our intention to show that the root of the crisis is that social science can provide no formal definition of “man”. In order to understand this we propose a phenomenological analysis into the essence of social science. This phenomenological approach will give us reason to abandon the (sexist) word “man” and instead we will speak of wer: the beings which we are. That we have not used the more usual “human being” (or some equivalent) is due to the human prejudice which is one of the major constituents of this crisis we seek to analyse. This thesis is divided into two Parts: normative and evaluative. In the normative Part we will seek a clarification of both “phenomenology” and “social science”. Due to the various ways in which “phenomenology” has been invented we must secure a simipliciter definition of phenomenology as an approach to philosophical anthropology (Chapter 2). Importantly, we will show how the key instigators of the branches of phenomenology, Husserl, Scheler, Heidegger, and Sartre, were all engaged in this task. To clarify our phenomenology we will define the Phenomenological Movement according to various strictures by drawing on the work of Schutz and his notion of provinces of meaning (Chapter 3). This will then be carried forward to show how Schutz’s postulates of social science (with certain clarifications) constitute the eidetic structure of social science (Chapter 4). The eidetic structures of social science identified will prompt several challenges that will be addressed in the evaluative Part. Here we engage in an imperial argument to sort proper science from pseudo-science. The first challenge is the mistaken assumption that universities and democratic states make science possible (Chapter 5). Contra this, we argue that science is predicated on “spare time” and that much institutional “science” is not in fact science. The second challenge is the “humanist challenge”: there is no such thing as nonpractical knowledge (Chapter 6). Dealing with this will require a reconsideration of the epistemic status that science has and lead to the claim of epistemic inferiority. Having cut away pseudo-science we will be able to focus on the “social” of social science through a consideration of intersubjectivity (Chapter 7). Drawing on the above phenomenologists we will focus on how an Other is recognised as Other. Emphasising Sartre’s radical re-conception of “subject” and “object” we will argue that there can be no formal criteria for how this recognition occurs. By consequence we must begin to move away from the assumption of one life-world to various life-worlds, each constituted by different conceptions of wer.

Memoria (licenciado en ciencias jurídicas y sociales) / Las rupturas familiares de la modernidad y las posteriores desapariciones de niños (ya sea dentro o fuera del país) en manos de alguno de sus progenitores, aparece como un problema propio de nuestros tiempos, reflotando una de las viejas discusiones que se han dado en el delito de sustracción de menores respecto de la determinación del sujeto activo. Teniendo en cuenta las diversas posturas doctrinales y jurisprudenciales, así como también la evolución del artículo 142 del Código Penal, habría que diferenciar entre la solución dada para el caso de los guardadores y de los progenitores. Tratándose de los guardadores, no sería aplicable la referida norma, por encontrarse regulada una figura especial en el artículo 355 del Código Penal y que sería plenamente aplicable a los mismos. Sin embargo, tratándose de los progenitores, sería posible que en ciertos casos les sea aplicable el artículo 142 por ser un tipo penal abierto en cuando al sujeto activo, eso sí, habría que efectuar una serie de distinciones partiendo siempre de la base de encontrarnos en situaciones de crisis familiar, ya que de lo contrario el menor se encontraría irrefutablemente en la esfera de protección de sus padres y no resultaría afectado el bien jurídico protegido por la norma