ALTERNATIF PENGEMBANGAN KEMAMPUAN BERPIKIR SECARA NALAR DAN KREATIF DALAM PEMBELAJARAN BAHASA INDONESIA

Pidato Pengukuhan Guru Besar Bahasa Indonesia. Pada Fakultas Keguruan dan Ilmu Pendidikan, Universitas Sebelas Maret. Disampaikan dalam Sidang Senat Terbuka. Universitas Sebelas Maret Surakarta. Pada tanggal 12 April 2008

Influence of convection and biomass burning outflow on tropospheric chemistry over the tropical Pacific

Observations over the tropics from the Pacific Exploratory Mission-Tropics A Experiment are analyzed using a one-dimensional model with an explicit formulation for convective transport. Adopting tropical convective mass fluxes from a general circulation model (GCM) yields a large discrepancy between observed and simulated CH3I concentrations. Observations of CH3I imply the convective mass outflux to be more evenly distributed with altitude over the tropical ocean than suggested by the GCM. We find that using a uniform convective turnover lifetime of 20 days in the upper and middle troposphere enables the model to reproduce CH3I observations. The model reproduces observed concentrations of H2O2 and CH3OOH. Convective transport of CH3OOH from the lower troposphere is estimated to account for 40-80% of CH3OOH concentrations in the upper troposphere. Photolysis of CH3OOH transported by convection more than doubles the primary HOx source and increases OH concentrations and O3 production by 10-50% and 0.4 ppbv d-1, respectively, above 11 km. Its effect on the OH concentration and O3 production integrated over the tropospheric column is, however, small. The effects of pollutant import from biomass burning regions are much more dominant. Using C2H2 as a tracer, we estimate that biomass burning outflow enhances O3 concentrations, O3 production, and concentrations of NOx and OH by 60%, 45%, 75%, and 7%, respectively. The model overestimates HNO3 concentrations by about a factor of 2 above 4 km for the upper one-third quantile of C2H2 data while it generally reproduces HNO3 concentrations for the lower and middle one-third quantiles of C2H2 data. Copyright 2000 by the American Geophysical Union

Polarization-Tailored Raman Frequency Conversion in Chiral Gas-Filled Hollow Core Photonic Crystal Fibers

Broadband-tunable sources of circularly-polarized light are crucial in fields such as laser science, biomedicine and spectroscopy. Conventional sources rely on nonlinear wavelength conversion and polarization control using standard optical components, and are limited by the availability of suitably transparent crystals and glasses. Although gas-filled hollow-core photonic crystal fiber provides pressure-tunable dispersion, long well-controlled optical path-lengths, and high Raman conversion efficiency, it is unable to preserve circular polarization state, typically exhibiting weak linear birefringence. Here we report a revolutionary approach based on helically-twisted hollow-core photonic crystal fiber, which displays circular birefringence, thus robustly maintaining circular polarization state against external perturbations. This makes it possible to generate pure circularly-polarized Stokes and anti-Stokes signals by rotational Raman scattering in hydrogen. The polarization state of the frequency-shifted Raman bands can be continuously varied by tuning the gas pressure in the vicinity of the gain suppression point. The results pave the way to a new generation of compact and efficient fiber-based sources of broadband light with fully-controllable polarization state.Comment: 5 pages, 4 figure

Algorithms to automatically quantify the geometric similarity of anatomical surfaces

We describe new approaches for distances between pairs of 2-dimensional surfaces (embedded in 3-dimensional space) that use local structures and global information contained in inter-structure geometric relationships. We present algorithms to automatically determine these distances as well as geometric correspondences. This is motivated by the aspiration of students of natural science to understand the continuity of form that unites the diversity of life. At present, scientists using physical traits to study evolutionary relationships among living and extinct animals analyze data extracted from carefully defined anatomical correspondence points (landmarks). Identifying and recording these landmarks is time consuming and can be done accurately only by trained morphologists. This renders these studies inaccessible to non-morphologists, and causes phenomics to lag behind genomics in elucidating evolutionary patterns. Unlike other algorithms presented for morphological correspondences our approach does not require any preliminary marking of special features or landmarks by the user. It also differs from other seminal work in computational geometry in that our algorithms are polynomial in nature and thus faster, making pairwise comparisons feasible for significantly larger numbers of digitized surfaces. We illustrate our approach using three datasets representing teeth and different bones of primates and humans, and show that it leads to highly accurate results.Comment: Changes with respect to v1, v2: an Erratum was added, correcting the references for one of the three datasets. Note that the datasets and code for this paper can be obtained from the Data Conservancy (see Download column on v1, v2

Antitumor activity of epidermal growth factor receptor tyrosine kinase inhibitors in human hepatocellular carcinoma cell lines

published_or_final_versio

Nonlinear optics in Xe-filled hollow-core PCF in high pressure and supercritical regimes

Supercritical Xe at 293 K offers a Kerr nonlinearity that can exceed that of fused silica while being free of Raman scattering. It also has a much higher optical damage threshold and a transparency window that extends from the UV to the infrared. We report the observation of nonlinear phenomena, such as self-phase modulation, in hollow-core photonic crystal fiber filled with supercritical Xe. In the subcritical regime, intermodal four-wave-mixing resulted in the generation of UV light in the HE12 mode. The normal dispersion of the fiber at high pressures means that spectral broadening can clearly obtained without influence from soliton effects or material damage

Dampak Pengumuman Peringkat Obligasi Pada Kinerja Obligasi Di Bursa Efek Indonesia

The purpose of this study was to determine empirically the changes on bond rating that impacted on the bond'sperformance. The changes on bond rating were rated by PT Pefindo. This study used 65 samples from 30companies with bonds data issued in 2009 – 2012. The samples were grouped into 13 upgrade bonds, 8downgrade bonds and 44 stable. Bond's performance was indicated by the value of yield to maturity (YTM).The paired t-test was deployed with software SPSS version 15. The result showed that there was no differentperformance before and after the announcement of bond ratings for both the entire sample and upgrade bondgroups. While for downgrade groups there was a significant difference before and after the announcement ofbond ratings. These result indicated that only downgade group had a significant difference from YTM, thereforebond ratings announcement contained useful information for the investors

Nonextensive hydrodynamics for relativistic heavy-ion collisions

The nonextensive one-dimensional version of a hydrodynamical model for multiparticle production processes is proposed and discussed. It is based on nonextensive statistics assumed in the form proposed by Tsallis and characterized by a nonextensivity parameter $q$. In this formulation the parameter $q$ characterizes some specific form of local equilibrium which is characteristic for the nonextensive thermodynamics and which replaces the usual local thermal equilibrium assumption of the usual hydrodynamical models. We argue that there is correspondence between the perfect nonextensive hydrodynamics and the usual dissipative hydrodynamics. It leads to simple expression for dissipative entropy current and allows for predictions for the ratio of bulk and shear viscosities to entropy density, $\zeta/s$ and $\eta/s$, to be made.Comment: Final version accepted for publication in Phys. Rev.

PENGARUH MODEL KOOPERATIF TIPE TEAMS GAMES TOURNAMENT (TGT) TERHADAP KEMAMPUAN KONSEP BANGUN RUANG

Abstract: The purpose of this research was to test the differences of student’s mathematical ability in application of concept geometrical between students taught with cooperative learning model type Teams Games Tournament (TGT) and students taught with conventional model at fifth grade of elementary school. This research is use of quasi-experimental studies (Quasi-Experimental Research) using the “Randomized Control Group Pretest Posttest Posttest Design”. The research population is all fifth grade students in the second semester of Elementary School in Jatiyoso Sub-District 2012/2013 year academic. Sampling technique is “Cluster Random Sampling”. Data collection techniques of ability in application of geometrical concept is using the test. And techniques of data analysis using t-test. The conclusion of this study is student’s ability in application of geometrical concept taught with cooperative learning model type Teams Games Tournament (TGT) is better than student’s taught with cooperative learning model. (tcount > ttable = 5,0667 > 2,0110). Abstrak: Tujuan penelitian ini untuk menguji ada tidaknya pengaruh perbedaan kemampuan penerapan konsep bangun ruang antara siswa yang diajar dengan model pembelajaran koopertaif tipe Teams Games Tournament (TGT) dan siswa yang diajar dengan model konvensional terhadap siswa kelas V SD. Penelitian ini menggunakan metode eksperimental semu (Quasi-Experimental Research) menggunakan rancangan “Randomized Control Groub Pretest Posttest Design”. Populasi penelitian ini adalah seluruh siswa kelas V semester genap SDN se-Kecamatan Jatiyoso tahun ajaran 2012/2013. Teknik pengambilan sampel dengan ”Cluster Random Sampling”. Teknik pengumpulan data kemampuan penerapan konsep bangun ruang menggunakan tes. Dan teknik analisis data menggunakan uji-t. Simpulan penelitian ini adalah kemampuan penerapan konsep bangun ruang siswa yang diajar dengan menggunakan model pembelajaran kooperatif tipe Teams Games Tournament (TGT) lebih baik dari pada siswa yang diajar dengan model pembelajaran konvensional (thitung > ttabel = 5,0667 > 2,0110). Kata kunci: kemampuan penerapan konsep bangun ruang, model kooperatif, model kooperatif tipe TG