Nano-porosity in GaSb induced by swift heavy ion irradiation

Nano-porous structures form in GaSb after ion irradiation with 185 MeV Au ions. The porous layer formation is governed by the dominant electronic energy loss at this energy regime. The porous layer morphology differs significantly from that previously reported for low-energy, ion-irradiated GaSb. Prior to the onset of porosity, positron annihilation lifetime spectroscopy indicates the formation of small vacancy clusters in single ion impacts, while transmission electron microscopy reveals fragmentation of the GaSb into nanocrystallites embedded in an amorphous matrix. Following this fragmentation process, macroscopic porosity forms, presumably within the amorphous phase.The authors thank the Australian Research Council for support and the staff at the ANU Heavy Ion Accelerator Facility for their continued technical assistance. R.C.E. acknowledges the support from the Office of Basic Energy Sciences of the U.S. DOE (Grant No. DE-FG02-97ER45656)

Sufficient Conditions for Fast Switching Synchronization in Time Varying Network Topologies

In previous work, empirical evidence indicated that a time-varying network could propagate sufficient information to allow synchronization of the sometimes coupled oscillators, despite an instantaneously disconnected topology. We prove here that if the network of oscillators synchronizes for the static time-average of the topology, then the network will synchronize with the time-varying topology if the time-average is achieved sufficiently fast. Fast switching, fast on the time-scale of the coupled oscillators, overcomes the descychnronizing decoherence suggested by disconnected instantaneous networks. This result agrees in spirit with that of where empirical evidence suggested that a moving averaged graph Laplacian could be used in the master-stability function analysis. A new fast switching stability criterion here-in gives sufficiency of a fast-switching network leading to synchronization. Although this sufficient condition appears to be very conservative, it provides new insights about the requirements for synchronization when the network topology is time-varying. In particular, it can be shown that networks of oscillators can synchronize even if at every point in time the frozen-time network topology is insufficiently connected to achieve synchronization.Comment: Submitted to SIAD

Prefrontal involvement in imitation learning of hand actions : effects of practice and expertise.

In this event-related fMRI study, we demonstrate the effects of a single session of practising configural hand actions (guitar chords) on cortical activations during observation, motor preparation, and imitative execution. During the observation of non-practised actions, the mirror neuron system (MNS), consisting of inferior parietal and ventral premotor areas, was more strongly activated than for the practised actions. This finding indicates a strong role of the MNS in the early stages of imitation learning. In addition, the dorsolateral prefrontal cortex (DLPFC) was selectively involved during observation and motor preparation of the non-practised chords. This finding confirms Buccino et al.’s (2004a) model of imitation learning: for actions that are not yet part of the observer’s motor repertoire, DLPFC engages in operations of selection and combination of existing, elementary representations in the MNS. The pattern of prefrontal activations further supports Shallice’s (2004) proposal of a dominant role of the left DLPFC in modulating lower-level systems, and of a dominant role of the right DLPFC in monitoring operations

Morphology and annealing kinetics of ion tracks in minerals

We have studied the morphology and annealing kinetics of ion tracks in Durango apatite using synchrotron small angle X-ray scattering. The non-destructive, artefact-free technique enables us to determine the track radii with a resolution of fractions of

Naturalisasi Transgender dalam Film Lovely Man

Film merupakan salah satu media massa yang digunakan untuk menyampaikan pesan dan ideologi ke masyarakat. Film merepresentasikan beberapa kejadian di dunia nyata.Film Lovely Man adalah film yang menggambarkan naturalisasi transgender.Kehidupan transgender sama seperti kehidupan masyarakat dominan, tidak ada yang berbeda. Heteronormativitas tidak memberikan ruang gerak yang bebas bagi gender lain selain dua gender dominan, yakni laki-laki dan perempuan. Terdapat 26 leksia dalam penelitian ini, dari leksia dipilih berdasarkan tujuan penelitian.Tujuan penelitian ini adalah bagaimana teks film Lovely Man dalam melakukan naturalisasi transgender dan mengetahui nilai-nilai dalam kultur dominan (heteronormatif) dalam film Lovely Man.Pada penelitian ini menggunakan pendekatan kualitatif dengan analisis semiotika Roland Barthes secara sintagmatik dan paradigmatik. Pada analisis paradigmatik menggunakan lima kode pokok pembacaan teks dari Roland Barthes. Naturalisasi dapat dilihat melalui makna sintagmatik dan paradigmatik dengan menunjukkan bahwa tokoh waria dalam film ini juga memiliki relasi hubungan keluarga yang normal sama seperti keluarga heteroseksual lain. Mitos dan ideologi membangun dan menaturalkan intepretasi tertentu secara khas dan historis dengan menunjukkan ikatan emosional antara ayah dan anak, panggilan orang tua “bapak” dan hubungan antara ayah dan anak. Panggilan “bapak” menunjukkan pada film ini ingin meleburkan status seorang bapak tidak hanya dilihat dari sisi biologisnya saja, tapi dilihat dari perannya sebagai seorang ayah. Namun disisi lain, film ini tidak bisa lepas dari heteronormativity yang ada. Waria masih terbelenggu dalam gender yang mereka yakini yakni transgender, namun dalam perannya sebagai pekerja seksual waria harus berperan sebagai peran feminin. Merubah bentuk tubuh dengan melakukan operasi plastik dengan menunjukkan adanya peran laki-laki dan wanita salah satu bentuk dalam teks film yang tidak bisa melepaskan heteronormativity

SAXS study of ion tracks in San Carlos olivine and Durango apatite

Ion tracks were generated in crystalline San Carlos olivine (Mg,Fe) 2SiO 4 and Durango apatite Ca 10(PO 4) 6F 2 using different heavy ions ( 58Ni, 101Ru, 129Xe, 197Au, and 238U) with energies ranging between 185 MeV and 2.6 GeV. The tracks and their annealing behavior were studied by means of synchrotron based small angle X-ray scattering in combination with in situ annealing. Track radii vary as a function of electronic energy loss but are very similar in both minerals. Furthermore, the annealing behavior of the track radii has been investigated and preliminary results reveal a lower recovery rate of the damaged area in olivine compared with apatite

Pelatihan Pengasuhan Anak dengan Gangguan Pemusatan Perhatian Disertai Hiperaktivitas (Gpph)

Orang tua yang memiliki anak Gangguan Pemusatan Perhatian disertai Hiperaktivitas (GPPH) sering melakukan pola pengasuhan yang tidak tepat terhadap perilaku anak. Akibatnya, gejala GPPH berlanjut dan berkembang menjadi komorbid. Program pelatihan pengasuhan ini bertujuan untuk meningkatkan pemahaman orang tua akan penanganan anak-anak dengan GPPH. Para peserta penelitian ini adalah tiga ibu-ibu dengan anak-anak berusia 7 – 9 tahun yang memiliki gangguan GPPH. Desain penelitian ini adalah eksperimen semu dengan satu kelompok pre test - post test design. Peneliti menggunakan panduan observasi dan kuesioner untuk mengetahui dan manajemen perilaku GPPH. Hipotesis diuji dengan Wilcoxon signed-rank test. Hasil penelitian menunjukkan bahwa pelatihan pengasuhan anak GPPH dapat meningkatkan pemahaman ibu dalam mengatasi anak dengan perilaku GPPH

Development and Validation of a Sensitive Entropy-Based Measure for the Water Maze

In the water maze, mice are trained to navigate to an escape platform located below the water's surface, and spatial learning is most commonly evaluated in a probe test in which the platform is removed from the pool. While contemporary tracking software provides precise positional information of mice for the duration of the probe test, existing performance measures (e.g., percent quadrant time, platform crossings) fail to exploit fully the richness of this positional data. Using the concept of entropy (H), here we develop a new measure that considers both how focused the search is and the degree to which searching is centered on the former platform location. To evaluate how H performs compared to existing measures of water maze performance we compiled five separate databases, containing more than 1600 mouse probe tests. Random selection of individual trials from respective databases then allowed us to simulate experiments with varying sample and effect sizes. Using this Monte Carlo-based method, we found that H outperformed existing measures in its ability to detect group differences over a range of sample or effect sizes. Additionally, we validated the new measure using three models of experimentally induced hippocampal dysfunction: (1) complete hippocampal lesions, (2) genetic deletion of αCaMKII, a gene implicated in hippocampal behavioral and synaptic plasticity, and (3) a mouse model of Alzheimer's disease. Together, these data indicate that H offers greater sensitivity than existing measures, most likely because it exploits the richness of the precise positional information of the mouse throughout the probe test

Compact modeling of organic transistors with multi-finger contacts

Organic thin-film transistors (OTFTs) with multi-finger contacts based on dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thio-phene (DNTT) exhibit near-zero turn-on voltage, hysteresis-free behavior, and high transconductance of 30-80 μA at VDS = VGS = −2 V. [1] In addition, common-source amplifiers based on such transistors deliver voltage gain even when the supply voltage is limited to 5 V, making them attractive for flexible/wearable analog sensors. This paper presents the results of compact modeling, implemented in Matlab Simulink, applied to such transistors. The measured transistor transfer characteristics are used to extract the parameters for the semi-empirical model. The model was validated in 3 ways on 8 OTFTs with varied geometries and substrates (glass or PEN). The validation included calculations of (a) transistor output characteristics, (b) a.c. drain currents for 1 Hz sinusoidal gate voltages, and (c) output voltages of the common-source amplifier, and their comparison to the measured data