Pengaruh Strategi Pembelajaran Aktif Tipe Peer Lesson Terhadap Penguasaan Konsep Biologi Pada Materi Ekosistem

Penelitian ini didasarkan pada permasalahan rendahnya penguasaan konsep peserta didik dalam mata pelajaran Biologi terutama materi ekositem. Penelitian ini bertujuan untuk mengetahui pengaruh strategi pembelajaran tipe peer lesson terhadap peningkatan penguasaan konsep Biologi peserta didik kelas VII pada materi ekosistem di SMP Negeri 11 Bandar Lampung. Populasi dalam penelitian ini yaitu peserta didik kelas VII SMP Negeri 11 Bandar Lampung Tahun 2014/2016. Jenis penelitian ini adalah Quasi Eksperiment dan desain penelitian Pretest-Postest control group design, dan teknik pengambilan sampel dilakukan dengan cara cluster random sampling. Berdasarkan uji-t diperoleh thitung=4.029 sedangkan ttabel=1.674, oleh karena thitung>ttabel maka H0 ditolak dan H1 diterima. Maka dapat disimpulan bahwa strategi pembelajaran aktif tipe peer lesson memberikan pengaruh yang signifikan terhadap penguasaan konsep Biologi peserta didik kelas VII SMP Negeri 11 Bandar Lampung tahun ajaran 2014/2015 pada materi ekositem

Electric Gap Control in a Semiconductor

We show that the Bi-Layer Graphene allows the control of its electronic gap under an applied voltage

Objectification theory predicts college women’s attitudes toward cosmetic surgery

This study investigated cosmetic surgery attitudes within the framework of objectification theory. One hundred predominantlyWhite, British undergraduate women completed self-report measures of impression management, global selfesteem, interpersonal sexual objectification, self-surveillance, body shame, and three components of cosmetic surgery attitudes. As expected, each of the objectification theory variables predicted greater consideration of having cosmetic surgery in the future. Also, as expected, sexual objectification and body shame uniquely predicted socialmotives for cosmetic surgery, whereas self-surveillance uniquely predicted intrapersonal motives for cosmetic surgery. These findings suggest that women’s acceptance of cosmetic surgery as a way to manipulate physical appearance can be partially explained by the degree to which they view themselves through the lenses of sexual and self-objectification

A threatening exchange: gender and life history strategy predict perceptions and reasoning about sexual harassment

Sexual harassment is a serious societal issue, with extensive economic and psychological consequences, yet it is also an ill-defined construct fundamentally defined in terms of subjective perception. The current work was designed to examine the ways in which individual differences between people are systematically related to different perceptions of sexual harassment scenarios, as well as reasoning about those harassment situations. Participants (N = 460) read several possible harassment scenarios and rated how uncomfortable they would find them. They then also evaluated a quid pro quo sexual harassment situation in terms of their interpretation of it as a threat or a social exchange and completed a deductive reasoning task about the same situation. Females and individuals with slow life history strategies were more uncomfortable with potential harassment situations and were more likely to interpret the quid pro quo scenario as a threat. Further, interpreting the scenario as a threat was associated with poorer performance on the deductive logic task, compared to those who interpreted the scenario as a social exchange

Spontaneous Octahedral Tilting in the Cubic Inorganic Caesium Halide Perovskites CsSnX3_3 and CsPbX3_3 (X = F, Cl, Br, I)

The local crystal structures of many perovskite-structured materials deviate from the average space group symmetry. We demonstrate, from lattice-dynamics calculations based on quantum chemical force constants, that all the caesium-lead and caesium-tin halide perovskites exhibit vibrational instabilities associated with octahedral titling in their high-temperature cubic phase. Anharmonic double-well potentials are found for zone-boundary phonon modes in all compounds with barriers ranging from 108 to 512 meV. The well depth is correlated with the tolerance factor and the chemistry of the composition, but is not proportional to the imaginary harmonic phonon frequency. We provide quantitative insights into the thermodynamic driving forces and distinguish between dynamic and static disorder based on the potential-energy landscape. A positive band gap deformation (spectral blueshift) accompanies the structural distortion, with implications for understanding the performance of these materials in applications areas including solar cells and light-emitting diodes