Peranan Fase Amorf Si3n4 Pada Nanokomposit Nc-tin/a-si3n4 Dalam Meningkatkan Kekerasan Dan Stabilitas Termal

The role of Si3N4 amorphous phase in nc-TiN/a-Si3N4 nanocomposites will be shown and compared with polycrystalline ZrN/Ni which has no such amorphous phase (non-composites). The presence of amorphous phase Si3N4 increases the hardness of film as well as the toughness of the bulk nanocomposites under indentation load. It has been observed that nc-TiN/a-Si3N4 nanocomposites films has higher thermal stability than ZrN/Ni polycrystalline films

Pembuatan Paduan (Ti1-xalx)n Dengan Teknik Plasma Cvd Dari Bubuk Alcl3, Gas N2 Dan H2, Serta Larutan Ticl4

    The substitution of Ti atoms by Al atoms in TiN lattice sites to form (Ti1-xAlx)N is clearly demonstrated by the coatings which were deposited on steel substrate and using plasma CVD technique. The presence of Al atoms in TiN lattice site is shown by means of XRD and EDX techniques: lattice parameters decreasing of TiN as the fraction of Al increases (XRD) and precipitation of hexagonal AlN phase (XRD) as the fraction of Al exceeding 0.8 (EDX). The hardness of these coating are just around 30 GPa, which is beyond the values reported in literatures

Prosedur Pengukuran Kekerasan Yang Benar Pada Nanokomposit Nc-tin/a-si3n4

Hardness of nc-TiN/a-Si3N4 nanocomposites which was determined by using two methods of measurements i. e. depth sensing method and remaining plastic indentation area that were magnified by using SEM (Scanning Electron Microscope) lie in the good agreement. The hardness value is not influenced by the biaxial and residual compressive stress. The measurement of the biaxial stress on the substrate shows a very small value of biaxial stress as well as the constant hardness and crystallite size against annealing temperature. Therefore, the reported hardness value here is theintrinsic value that depend on its microstructure properties

Acute Genetic Manipulation of Neuronal Activity for the Functional Dissection of Neural Circuits — A Dream Come True for the Pioneers of Behavioral Genetics

This review summarizes technical development of the functional manipulation of specific neural circuits through genetic techniques in Drosophila. Long after pioneers ’ efforts for the genetic dissection of behavior using this organism as a model, analyses with acute activation of specific neural circuits have finally become feasible using transgenic Drosophila that expresses light-, heat-, or cold-activatable cation channels by xxx/upstream activation sequence (Gal4/UAS)-based induction system. This methodology opened a new avenue to dissect functions of neural circuits to make dreams of the pioneers into reality

Perbedaan Model Pembelajaran Problem Solving dan Discovery Learning ditinjau dari Kemampuan Berpikir Kritis Peserta Didik

Penelitian ini bertujuan untuk mengetahui perbedaan model pembelajaran Discovery learning dan Problem solving ditinjau dari keterampilan berpikir kritis peserta didik kelas 4 sekolah Dasar pada pembelajaran tematik. Sampel penelitian diambil menggunakan teknik probality yaitu dengan area sampling atau cluster sampling sehingga jumlah sampel penelitian berjumlah 51 peserta didik. Metode penelitian yang dugunakan adalah eksperimen semu (Quasi Eksperimental Research). Teknik analisis data menggunakan teknik deskriptif dan uji T. hasil penelitian menunjukan bahwa penggunaan model pembelajaran Problem solving lebih efektif dalam meningkatkan keterampilan berpikir kritis dari pada model pembelajaran Discovery learning. Hal tersebut dapat dibuktikan dengan hasil akhir yang diperoleh dari kelas eksperimen dengan jumlah peserta didik (N) sebanyak 26 peserta didik dengan nilai rata-rata sebesar 61,32, sementara pada kelas kontol diperoleh nilai rata-rata sebesar 66,85 dengan (N) sebanyak 25 peserta didik. Hasil uji T diperoleh nilai signifikansi pada F sebesar 2,589 dan nilai sig 0,024 < 0,050, maka Ho ditolak dan Ha diterima yang artinya bahwa terdapat perbedaan yang signifikan dalam penerapan model problem solving dan discovery learning ditinjau dari keterampilan berpikir kritis peserta didik kelas 4 SD dalam pembelajaran temati

Determination of the constitutive equation parameters of a thixotropic Al alloy and FEM modelling of the thixoforming process

International audienceThis paper is focused on the thixoforming of A356 Al alloy. In the present study, an original rheological test has been developed. The identification of the constitutive equation parameters has been carried out by the finite element modelling. On another hand, the adaptation of a three-dimensional FEM code to the simulation of the process is presented, together with and its first application to an industrial test part

Construction of an in vivo System for Functional Analysis of the Genes Involved in Sex Pheromone Production in the Silkmoth, Bombyx mori

Moths produce species-specific sex pheromones to attract conspecific mates. The biochemical processes that comprise sex pheromone biosynthesis are precisely regulated and a number of gene products are involved in this biosynthesis and regulation. In recent years, at least 300 EST clones have been isolated from Bombyx mori pheromone gland (PG) specific cDNA libraries with some of those clones [i.e., B. mori PG-specific desaturase 1 (Bmpgdesat1), PG-specific fatty acyl reductase, PG-specific acyl-CoA-binding protein, B. mori fatty acid transport protein, B. mori lipid storage droplet protein-1] characterized and demonstrated to play a role in sex pheromone production. However, most of the EST clones have yet to be fully characterized and identified. To develop an efficient system for analyzing sex pheromone production-related genes, we investigated the feasibility of a novel gene analysis system using the upstream region of Bmpgdesat1 that should contain a PG-specific gene promoter in conjunction with piggyBac vector-mediated germ line transformation. As a result, we have been able to obtain expression of our reporter gene (enhanced green fluorescent protein) in the PG but not in other tissues of transgenic B. mori. Current results indicate that we have successfully constructed a novel in vivo gene analysis system for sex pheromone production in B. mori

Extra-large crystal emulsion detectors for future large-scale experiments

Photographic emulsion is a particle tracking device which features the best spatial resolution among particle detectors. For certain applications, for example muon radiography, large-scale detectors are required. Therefore, a huge surface has to be analyzed by means of automated optical microscopes. An improvement of the readout speed is then a crucial point to make these applications possible and the availability of a new type of photographic emulsions featuring crystals of larger size is a way to pursue this program. This would allow a lower magnification for the microscopes, a consequent larger field of view resulting in a faster data analysis. In this framework, we developed new kinds of emulsion detectors with a crystal size of 600-1000 nm, namely 3-5 times larger than conventional ones, allowing a 25 times faster data readout. The new photographic emulsions have shown a sufficient sensitivity and a good signal to noise ratio. The proposed development opens the way to future large-scale applications of the technology, e.g. 3D imaging of glacier bedrocks or future neutrino experiments.Comment: Version accepted for publication in JINS