Pengaruh Metode Problem Solving terhadap Hasil Belajar Siswa pada Konsep Koperasi dan Pengelolaan Koperasi Kelas X di Sman 11 Kota Pekanbaru

This research was conducted at SMAN 11 Pekanbaru with the aim to analyze problem solving method to student learning outcomes. The population in this study were students of class X IPS and Samples performed by using simple random sampling because the samples taken 2 classes based on homogeneity test results from the class. Technique of completion of data is done by observation, documentation and teacher activity sheet then the data is analyzed using homogeneity test test and t test. The result of the research shows that the result of pretest of X class students still get very less category and the result of pretest result of students is done by determining homogenous class with simple random sampling technique and can be homogenous class group that is class X IIS 2 and X IIS 4 Levene's test results 0.819> 0.05 which means that the data comes from a homogeneous variant. After doing the pretest then the homogenity test is done postes The data obtained from the experimental class postes and control classes will be analyzed using levent test. Then get value Pvalue 0,743> 0,05 then this can be interpreted that data of learning result of postest class of IIS 4 and X IIS 2 is homogeneous. After the homes of postes test, then t test analysis from post test of experiment class and control class with 5% (α 0,05) belief obtained significance value 0,007 so it can be interpreted that there is significant difference

THE IRON SPIN TEXTURE IN ANNEALED AMORPHOUS Fe/Tb MULTI-LAYERS

Fe/Tb multilayers have been obtained by vacuum evaporation with Tb-layer thickness fixed to 40Å and amorphous Fe-layer thickness fixed to 19Å. 57Fe-Mössbauer spectrometry was used to obtain information on the structure and the spin texture of the multilayers before and after annealing at 530K for different durations of the annealing. The Mössbauer results indicate that the Perpendicular Magnetic Anisotropy (PMA) was stabilised and reinforced after annealing.Fe/Tb multilayers have been obtained by vacuum evaporation with Tb-layer thickness fixed to 40Å and amorphous Fe-layer thickness fixed to 19Å. 57Fe-Mössbauer spectrometry was used to obtain information on the structure and the spin texture of the multilayers before and after annealing at 530K for different durations of the annealing. The Mössbauer results indicate that the Perpendicular Magnetic Anisotropy (PMA) was stabilised and reinforced after annealing

Clinical and seroepidemiological study of Leishmaniasis in Northern Morocco

Une étude clinique, parasitologique et sérologique entreprise de 1993 à 1996 dans trois régions (17 localités) du nord du Maroc a révélé une fréquence élevée de la leishmaniose canine. 1362 chiens ont été examinés. Les sérums ont été collectés et testés selon la technique ELISA utilisant la souche locale Leishmania infantum comme antigène. Les résultats obtenus ont révélé une séroprévalence (quand elle n’est pas nulle) allant de 3,77% à 35,7%. Six isolats ont été caractérisés : 5L eishmania infantum ont été identifiés dans les provinces de Khémisset et Taza et une souche Leishmania tropica isolé d’un cas leishmanien dans la province de Taounate. La majorité des chiens cliniquement suspects ont montré des lésions ulcératives de la peau, amaigrissement, onychogriffose et lymphadenopathie. L’alopécie, la cécité et la diarrhée ont été observés uniquement dans la province de Khémisset

Investigation of optical and chemical bond properties of hydrogenated amorphous silicon nitride for optoelectronics applications

International audienceThe aim of this work is to determine optimal deposition parameters of silicon nitride for optical applications. The authors present the investigation of hydrogenated amorphous silicon nitride SiNx:H deposited by the low temperature PECVD method in high frequency reactors. The study of hydrogen bonds in the SiNx:H thin films were detailed. The impact of NH3, SiH4 and N2 flow ratio and radio frequency power on optical coefficients in relation to chemical composition and roughness of the film is studied. The correlation between chemical bonds (N–H, Si–H) and refractive index and extinction coefficients is systematically verified. The experimental results show that the films with high refractive indexes superior to 2.05 and low roughness of about 0.35 nm can be achieved for optoelectronics applications by tuning the flow ratio or decreasing the RF power. A variety of processes have been suggested as compatible with low thermal budget (under 350 °C) in order to integrate optical waveguides with lower loss. In particular, the incorporation of N2 as dilution gas is suited to the fabrication of SiNx:H films optical waveguide requiring low N–H bonds, low concentration of hydrogen [H] and high refractive index

An interferometric scanning microwave microscope and calibration method for sub-fF microwave measurements

International audienceWe report on an adjustable interferometric set-up for Scanning Microwave Microscopy. This interferometer is designed in order to combine simplicity, a relatively flexible choice of the frequency of interference used for measurements as well as the choice of impedances range where the interference occurs. A vectorial calibration method based on a modified 1-port error model is also proposed. Calibrated measurements of capacitors have been obtained around the test frequency of 3.5 GHz down to about 0.1 fF. Comparison with standard vector network analyzer measurements is shown to assess the performance of the proposed system

Synthesis, Structure and <i>In Vitro</i> Anticancer Activity of Pd(II) Complex of Pyrazolyl-<i>s</i>-Triazine Ligand; A New Example of Metal-Mediated Hydrolysis of <i>s</i>-Triazine Pincer Ligand

The square planar complex [Pd(PT)Cl(H2O)]*H2O (HPT: 6-(3,5-dimethyl-1H-pyrazol-1-yl)-1,3,5-triazine-2,4(1H,3H)-dione) was obtained by the reaction of 2-methoxy-4,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)-1,3,5-triazine (MBPT) pincer ligand with PdCl2 in a molar ratio (1:1) under thermal conditions and using acetone as a solvent. The reaction proceeded via C-N cleavage of one C-N moiety that connects the pyrazole and s-triazine combined with the hydrolysis of the O-CH3 group. The reaction of the chloride salt of its higher congener (PtCl2) gave [Pt(3,5-dimethyl-1H-pyrazole)2Cl2]. The crystal structure of [Pd(PT)Cl(H2O)]*H2O complex is stabilized by inter- and intra-molecular hydrogen bonding interactions. Hirshfeld analysis revealed that the H...H (34.6%), O...H (23.6%), and Cl...H (7.8%) interactions are the major contacts in the crystal. The charges at Pd, H2O, Cl and PT are changed to 0.4995, 0.2216, −0.4294 and −0.2917 instead of +2, 0, −1 and −1, respectively, using the MPW1PW91 method. [Pd(PT)Cl(H2O)]*H2O complex has almost equal activities against MDA-MB-231 and MCF-7 cell lines with IC50 of 38.3 µg/mL

Synthesis, X-ray Crystal Structure and Antimicrobial Activity of Unexpected Trinuclear Cu(II) Complex from s-Triazine-Based Di-Compartmental Ligand via Self-Assembly

The synthesis and X-ray crystal structure of the trinuclear [Cu3(HL)(Cl)2(NO3)(H2O)5](NO3)2 complex of the s-triazine-based di-compartmental ligand, 2-methoxy-4,6-bis(2-(pyridin-2-ylmsethylene)hydrazinyl)-1,3,5-triazine (H2L), are presented. The Cu1 and Cu2 are penta-coordinated with CuN3ClO coordination environment, distorted square pyramidal coordination geometry while Cu3 is hexa-coordinated with CuN2O4 coordination sphere, and distorted octahedral geometry. The complex crystallized in the primitive P-1 triclinic crystal system with two molecular units per unit cell. Its packing is dominated by the O&ndash;H (35.5%) and Cl&ndash;H (8.8%) hydrogen bonding interactions as well as the &pi;&ndash;&pi; stacking (2.3%) and anion&ndash;&pi;-stacking interactions (3.7%). The different coordination interactions were analyzed using atoms in molecules (AIM) theory, and the number of charge transferences from the ligand group to Cu(II) were determined using natural bond orbital calculations. The effect of the free ligand and its Cu(II) complex on the tested pathogenic microbes (Staphylococcus aureus, S. epidermidis, Enterococcus faecalis, Escherichia coli, Salmonella typhi and Pseudomonas aeruginosa) and one fungal isolate (Candida albicans) is presented. Both have wide spectrum antimicrobial activity against the selected microorganism. It is observed that the free ligand at 180 &micro;g/mL was more effective than its Cu(II) complex and showed close results compared to the positive control gentamicin. At higher concentrations (1 mg/mL), the Cu(II) complex was found to be more active against S. epidermidis, E. coli and C. albicans than the lower concentration. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values are also lower for the Cu(II) complex than the free ligand

Synthesis, X-ray Crystal Structure and Antimicrobial Activity of Unexpected Trinuclear Cu(II) Complex from s-Triazine-Based Di-Compartmental Ligand via Self-Assembly

The synthesis and X-ray crystal structure of the trinuclear [Cu3(HL)(Cl)2(NO3)(H2O)5](NO3)2 complex of the s-triazine-based di-compartmental ligand, 2-methoxy-4,6-bis(2-(pyridin-2-ylmsethylene)hydrazinyl)-1,3,5-triazine (H2L), are presented. The Cu1 and Cu2 are penta-coordinated with CuN3ClO coordination environment, distorted square pyramidal coordination geometry while Cu3 is hexa-coordinated with CuN2O4 coordination sphere, and distorted octahedral geometry. The complex crystallized in the primitive P-1 triclinic crystal system with two molecular units per unit cell. Its packing is dominated by the O–H (35.5%) and Cl–H (8.8%) hydrogen bonding interactions as well as the π–π stacking (2.3%) and anion–π-stacking interactions (3.7%). The different coordination interactions were analyzed using atoms in molecules (AIM) theory, and the number of charge transferences from the ligand group to Cu(II) were determined using natural bond orbital calculations. The effect of the free ligand and its Cu(II) complex on the tested pathogenic microbes (Staphylococcus aureus, S. epidermidis, Enterococcus faecalis, Escherichia coli, Salmonella typhi and Pseudomonas aeruginosa) and one fungal isolate (Candida albicans) is presented. Both have wide spectrum antimicrobial activity against the selected microorganism. It is observed that the free ligand at 180 µg/mL was more effective than its Cu(II) complex and showed close results compared to the positive control gentamicin. At higher concentrations (1 mg/mL), the Cu(II) complex was found to be more active against S. epidermidis, E. coli and C. albicans than the lower concentration. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values are also lower for the Cu(II) complex than the free ligand.peerReviewe