Manajemen Laboratorium Bahasa dalam Meningkatkan Kemampuan Percakapan Bahasa Inggris Siswa

Kemahiran berbahasa Inggris adalah merupakan salah satu jeniskemampuan yang ingin dicapai dalam pengajaran berbahasa Inggriskarena bahasa Inggris merupakan bahasa Internasional dan sarana utamauntuk berkomunikasi dengan orang barat dan memahami buku yangberbahasa Inggris. Maka diperlukan pengoptimalan belajar dan mengajarbahasa Inggris di dalam instansi pendidikan formal maupun non formal.Untuknya, upaya-upaya pengoptimalan kegiatan belajar mengajar sangattepat dilakukan demi meningkatkan kualitas pendidikan bahasa Inggris.Kualitas manusia yang dibutuhkan oleh bangsa Indonesia pada masa yangakan datang adalah yang mampu menghadapi persaingan yang semakinketat dengan bangsa lain di dunia. Kualitas manusia Indonesia tersebutdihasilkan melalui penyelenggaraan pendidikan yang bermutu

Regioselective Synthesis of Indene from 3-Aryl Propargylic gem -Dipivalates Catalyzed by N -Heterocyclic Carbene Gold(I) Complexes

International audience1-Aryl-3,3-bis(pivaloyloxy)propynes can be converted in good to high yields into either 1,3-or 1,2-bis(pivaloyloxy)indenes, depending on the N-heterocyclic carbene (NHC) gold(I) hexafluoroantimonate catalyst used. Almost exclusive formation of 1,3-di(oxycarbonyl)indene derivatives was achieved with cationic gold complexes containing the embracing N,N'-1,3-bis(9-butylfluorenyl)benzimidazolylidene ligand (nBu FNHC). The regioselective issue of the reaction was rationalized by the specific spatial distribution of the steric bulk in the nBu FNHC ligand. In contrast, only modest selectivities in favor of 1,2-disubstituted indenes were observed with more classical NHC gold complexes, the best selectivity being then obtained with N,N'-1,3-bis(2,6-diisopropylphenyl)-4,5-dihydroimidazolylidene gold chloride (SIPrAuCl) as precatalyst

Pentingnya pemberian layanan khusus pada peserta didik

In this article we will discuss about providing special services to students so that student learning outcomes are better, in accordance with the objectives to be achieved and can run effectively and efficiently. At school the chief administrator of the special service is the principal who is assisted by other school staff to carry out special service administration that has been made before. Included in special services in schools are libraries, laborers, UKS, cafeterias, worship facilities, dormitories, cooperatives, and transportation. The purpose of providing this special service is to be able to facilitate students in achieving their educational goals at school. Education in schools also requires that students change toward a more stable, both physical and spiritual aspects. In general, the special services provided by each school to students are the same, the only difference being the management and utilization process

Implementazione e verifica degli algoritmi per il controllo di esposizione automatico nelle radiografie.

Descrizione della progettazione, costruzione e validazione della modalità automatica di esposizione negli esami 2D, disponibili presso il dispositivo radiografico top di gamma dell'azienda Cefla SC

Pentingnya pemberian layanan khusus pada peserta didik

In this article we will discuss about providing special services to students so that student learning outcomes are better, in accordance with the objectives to be achieved and can run effectively and efficiently. At school the chief administrator of the special service is the principal who is assisted by other school staff to carry out special service administration that has been made before. Included in special services in schools are libraries, laborers, UKS, cafeterias, worship facilities, dormitories, cooperatives, and transportation. The purpose of providing this special service is to be able to facilitate students in achieving their educational goals at school. Education in schools also requires that students change toward a more stable, both physical and spiritual aspects. In general, the special services provided by each school to students are the same, the only difference being the management and utilization process

Sham alliance : Treatment collaboration between delinquent youth and staff in correctional institutions

This is a study of treatment alliance between staff and juvenile delinquent boys in institutional treatment under the Swedish Board of Institutions (SiS). The aim of this study is twofold. First, the purpose is to explore alliance phenomena in correctional institutions for young delinquents in their qualitative, rather than quantitative, aspects. Second, the study aims to explore possible preconditions - obstacles and possibilities - for the development of a genuine treatment alliance between staff and youth. In a case-within-cases design, eight boys in two institutions were followed throughout their treatments. Through participant observations, interviews, and on the basis of their case files I collected data from both the youths and the staff at different points of time during the treatment. Information from the three data sources was used for the purpose of triangulation and mutual validation. The main findings indicate the existence of two kinds of alliance processes, one a genuine alliance and the other a sham alliance one. The genuine alliance appears to be a rare occurrence at these institutions. On the contrary, close examination reveals that a high level of institutional adjustment on the part of a boy in custody often reflects mere sham alliance. The sham alliance builds upon a strong tacit mutual agreement between the boy and the staff to establish a non-change relation. The stronger the staff-youth agreement about this kind of relation, the stronger the sham alliance. Sham alliance serves the common avoidance of conflicting emotions (at unconscious and conscious levels) and contributes to momentary symptomatic relief. Equally important, sham alliance generates an atmosphere of calm and peace on the ward. Among several factors, one of the most significant obstacles to the development of genuine alliance is the fact that the boy is admitted to the institution not on his own will but typically strongly against it. Factors that promote the development of a genuine alliance within a correctional institution are discussed finally

Chimie de coordination de carbènes N-hétérocycliques substitués par des groupements alkyfluorényle : interactions faibles, effets stériques, catalyse

This thesis deals with a series of N-heterocyclic carbene ligands (NHCs) in which the N atoms bear expanded alkylfluorenyl (AF) substituents. Special focus has been put on the steric properties of these new ligands, as well as their influence on catalytic reactions involving Pd and Cu centres.The first part of this work describes the synthesis of a series of AF-substituted azolium salts suitable for the preparation of palladium PEPPSI-NHC complexes. These turned out to be very active in Suzuki-Miyaura cross-coupling reactions between para-substituted aryl chlorides and arylboronic acids. Structural and NMR studies revealed that in all the complexes, the NHC ligand displays a "bimodal pincer" type behaviour, that is functions as a tridentate ligand bound to the metal through both covalent and non covalent bonds, the former involving the carbenic C atom, the latter CH atoms of the wingtips.In the second part of the study, a series of linear [AuCl(NHC)] and [CuCl(NHC)] complexes were prepared. In some of them were observed weak CH•••M interactions involving the alkyl chains fixing the metal centre in a position below the NHC ring plane. This leads to an unusual coordination of the ligand able to freeze out the movement of the metal centre during its natural oscillation about the M-carbene axis.In the last part of this thesis, one of the [CuCl(NHC)] complexes synthesised was shown to be highly efficient in the catalytic hydrosilylation of functionalised/sterically crowded aldehydes and ketones (TONs up to 1000). Its high stability was attributed to the variable encumbrance of the ligand.Cette thèse porte sur l’étude de nouveaux carbènes N-hétérocycliques dont les atomes d'azote sont substitués par des groupes étendus alkylfluorényle (AF). Les caractéristiques principales de ces coordinats sont leur fort encombrement stérique, la modularité de ce dernier, et la proximité créée dans les complexes correspondants entre les groupes AF et le métal coordiné.La première partie de ce travail décrit la synthèse et la caractérisation d'un ensemble de sels d’azolium, précurseurs de cette nouvelle famille de NHCs. Ces composés ont d'abord été utilisés pour la préparation de complexes de palladium de type "Pd-PEPPSI-NHC", complexes qui se sont avérés très efficaces en couplage de Suzuki-Miyaura entre acides arylboroniques et chlorures d’aryle para-substitués. Des études structurales et RMN ont montré que dans leur complexes, les NHC formés agissent comme des pinces bimodales, c'est-à-dire combinant une interaction covalente (la liaison M-Carbène) et deux interactions non-covalentes impliquant les groupes AF. Dans certains complexes linéaires de l’or(I) et du cuivre (I), ces interactions faibles entre le métal et des liaisons C-H alentours ont permis la coordination non-optimale du centre métallique qui, à l’état solide, se retrouve hors de l’axe formé par le doublet non liant du carbène. Enfin, un complexe de type CuCl(NHC) dont l’encombrement stérique est variable a été préparé. Il s’est avéré être un excellent catalyseur d’hydrosilylation d’aldéhydes et de cétones. A ce jour, il possède l’une des plus grandes activité et longévité (TONs jusqu’à 1000) pour ce type de complex

N-Heterocyclic Carbenes Functioning as Monoligating Clamps

International audienceBenzimidazolium salts N,N′-disubstituted with 9-alkylfluorenyl groups (3a-e, alkyl = methyl, ethyl, propyl, butyl, benzyl) have been synthesised in high yields in three steps from o-phenylenediamine. This amine was treated with fluorenone in the presence of TiCl4 and tetramethylethylenediamine (TMEDA) to form N,N′-bis(9H-fluoren-9-ylidene)benzene-1,2-diamine (1) in 91 % yield. Diamines 2a-e were then obtained in yields superior or equal to 77 % by reacting diimine 1 with the appropriate organolithium reagent. In the final step, diamines 2a-e were treated with ethylorthoformate under acidic conditions to afford benzimidazolium salts 3a-e. These were readily converted into the PEPPSI palladium complexes 4a-e (PEPPSI = pyridine-enhanced precatalyst preparation stabilisation and initiation). NMR and X-ray diffraction studies revealed that the flat fluorenylidene moiety orientates the alkyl groups towards the metal centre and because of its restricted rotational freedom makes the ligand bulkiness time independent. Thus, the metal centre is permanently confined between the two alkyl groups, and thereby forms a monoligating clamp with the carbenic centre. The CH2 groups close to the palladium ion give rise to anagostic C-H***Pd interactions. Catalytic tests revealed that the palladium complexes 4a-e are highly efficient in Suzuki-Miyaura cross-coupling reactions; their activity is equal or superior to the best PEPPSI catalysts reported to date