Isoskeletal Schiff base polynuclear coordination clusters: synthetic and theoretical aspects

This work addresses and enlightens synthetic aspects derived from our effort to systematically construct isoskeletal tetranuclear coordination clusters (CCs) of the general formula [TR2Ln2(LX)4(NO3)2(solv)2] possessing a specific defected dicubane topology, utilizing various substituted Schiff base organic ligands (H2LX) and NiII/CoII and Dy(OTf)3 salts. Our synthetic work is further supported by DFT studies

Dinuclear Lanthanide (III) coordination polymers in a domino reaction

A systematic study was performed to further optimise the catalytic room-temperature synthesis of trans-4,5- diaminocyclopent-2-enones from 2-furaldehyde and primary or secondary amines under a non-inert atmosphere. For this purpose, a series of dinuclear lanthanide (III) coordination polymers were synthesised using a dianionic Schiff base and their catalytic activities were investigated

13C-ETHANE IN THE ATMOSPHERES OF JUPITER AND SATURN

High-resolution12C- and13C-ethane spectra of Jupiter and Saturn were acquired with the McMath-Pierce 60 inch (1.5 m) Telescope and Celeste, Goddard Space Flight Center's cryogenic grating spectrometer, in 1995 November and December. A relative abundance ratio12C/13C of 91 +26–13 for Jupiter and 99+43-23 for Saturn was derived from the measurements. These nearly terrestrial values suggest little or no fractionation of carbon isotopes in the atmospheres of Jupiter and Saturn. A weighted average of the available12C/13C ratios for the outer planets yields 88 ± 7, thus presenting no evidence for change in the carbon isotopic ratio between the presolar nebula and the present atmospheres of the outer planets

Teaching Reading Comprehension on Narrative Text by Using Powerpoint Animations

Email: [email protected] Abstract: This Research aimed to answer the research questions about the significant and the size effect of the use of PowerPoint Animations in teaching reading comprehension on narrative text. This research used a pre-experimental study in one group pretest posttest design. The data of this research were collected by using measurement technique that was written test in the form of essay test numbering 10 items. The population of this research was the Second Year students of SMA Negeri 1 Kembayan in Academic Year 2012/2013 numbering 106 students. The sample of this research was 30 students (class XI IPA 1). The finding of this research showed that PowerPoint Animations increased the students\u27 achievement in reading comprehension significantly. Then, the effect size of treatment (ES= 1.34 > 0.8) and categorized as highly effective. Key words: Teaching Reading Comprehension, Narrative, PowerPoint Animations. Abstrak: Penelitian ini bertujuan untuk menjawab pertanyaan penelitian mengenai signifikan dan tingkat efektifitas dari penggunaan animasi powerpoint dalam pengajaran pemahaman membaca di dalam teks naratif. Penelitian ini menggunakan studi pre-eksperimen dengan disain satu grup pretest posttest. Data penelitian ini didapatkan dengan menggunakan teknik pengukuran yaitu tes tertulis dalam bentuk essai berjumlah 10 soal. Populasi dalam penelitian ini adalah siswa tahun ke dua dari SMA Negeri 1 Kembayan tahun ajaran 2012/2013 berjumlah 160 siswa. Sampel penelitian ini berjumlah 30 siswa (kelas XI IPA). Hasil penelitian menunjukan bahwa powerpoint animasi meningkatkan hasil belajar siswa dalam pemahaman membaca secara signifikan. Kemudian, pengukuran dari ukuran keefefktifan (ES=1.34>0.8) dan dikategorikan tingkat effektifitasnya tinggi

Identification Students' Difficulties In Writing Hortatory Exposition Among High Intermediate Level

This research aims to identify students' difficulties in writing hortatory exposition text at high intermediate level in Gajahmada English course. The method used is a descriptive study. The sample of the study is 10 students at high intermediate level of Gajahmada English course. The tool of data collecting was a written test that the students wrote hortatory exposition text. The finding showed the average of students' score is “60.2” which is categorize “Difficult”. In grammar, students difficulties in arranging the tense and the compound-complex sentences. In mechanic, students difficulties in spelling, punctuation and word choice. In vocabulary, students difficulties in using of personal noun, abstract noun, general noun, action verb, verb, adverb and adjectives. In content, students able wrote the text, but their difficulties on the relevant details among thesis, arguments and recommendation. Keywords: Identification, students' difficulties, hortatory exposition Abstrak : Penelitian ini bertujuan mengidentifikasi kesulitan siswa menulis teks hortatory exposition pada level high intermediate di bimbingan belajar Gajahmada. Metode penelitian ini adalah penelitian deskriptif. Peserta penelitian adalah siswa bimbingan belajar Gajahmada level high intermediate, terdapat 10 peserta sebagai sampel. Alat mengumpulkan data yaitu sebuah tes tertulis, yakni siswa menulis teks hortatori exposisi. Hasil penelitian menunjukkan rata-rata nilai 60,2 dikategorikan “sulit”. Struktur bahasa, siswa kesulitan menyusun struktur kalimat dan penggunaan kalimat majemuk setara – bertingkat. Mekanisme penulisan, siswa kesulitan dalam ejaan, tanda baca, dan pilihan kata. Kosakata, siswa kesulitan menggunaan kata ganti orang, kata ganti abstrak, kata benda umum, kata kerja, kata keterangan, kata sifat. Untuk isi, siswa dapat menulis teks, tapi kesulitan pada relevansi antara ide pokok, pendapat, dan rekomendasi

Teaching Descriptive Text Writing By Using Powerpoint Presentation

This research is focused on teaching descriptive text writing by using PowerPoint Presentation. The aim of this research is to know the effectiveness of teaching descriptive text writing by using PowerPoint Presentation to the seventh grade students of MTsN 1 Pontianak in the academic year 2011/2012. It is a pre-experimental study where the form used is one group of pretest and posttest design. The population in this research was all the seventh grade students of MTsN 1 Pontianak in academic year 2011/2012. It involved 32 students from class VIIB as the research subjects. The data were collected by written test and analyzed by ES (Effect Size) formula. The finding show the effect size of treatment (ES) is 2.64. Since the value is higher than 0.5, the effect size of treatments (ES) is categorized as highly efective. It means that teaching descriptive text writing by using PowerPoint Presentation to the seventh grade students of MTsN 1 Pontianak in academic year 2011/2012 gave a significant effect to improve the students achievement

Recent Transits of the Super-Earth Exoplanet GJ 1214b

We report recent ground-based photometry of the transiting super-Earth exoplanet GJ1214b at several wavelengths, including the infrared near 1.25 microns (J-band). We observed a J-band transit with the FLAMINGOS infrared imager and the 2.1-meter telescope on Kitt Peak, and we observed several optical transits using a 0.5-meter telescope on Kitt Peak and the 0.36-meter Universidad de Monterrey Observatory telescope. Our high-precision J-band observations exploit the brightness of the M-dwarf host star at this infrared wavelength as compared to the optical, as well as being significantly less affected by stellar activity and limb darkening. We fit the J-band transit to obtain an independent determination of the planetary and stellar radii. Our radius for the planet (2.61^+0.30_-0.11 Earth radii) is in excellent agreement with the discovery value reported by Charbonneau et al. based on optical data. We demonstrate that the planetary radius is insensitive to degeneracies in the fitting process. We use all of our observations to improve the transit ephemeris, finding P=1.5804043 +/- 0.0000005 days, and T0=2454964.94390 +/- 0.00006 BJD.Comment: Accepted for ApJ Letters, 7 pages, 3 Figures, 2 Table