12,901 research outputs found
Phase-coexisting patterns, horizontal segregation and controlled convection in vertically vibrated binary granular mixtures
We report new patterns, consisting of coexistence of sub-harmonic/harmonic
and asynchronous states [for example, a granular gas co-existing with (i)
bouncing bed, (ii) undulatory subharmonic waves and (iii) Leidenfrost-like
state], in experiments on vertically vibrated binary granular mixtures in a
Heleshaw-type cell. Most experiments have been carried out with equimolar
binary mixtures of glass and steel balls of same diameter by varying the total
layer-height () for a range of shaking acceleration (). All patterns
as well as the related phase-diagram in the ()-plane have been
reproduced via molecular dynamics simulations of the same system. The
segregation of heavier and lighter particles along the horizontal direction is
shown to be the progenitor of such phase-coexisting patterns as confirmed in
both experiment and simulation. At strong shaking we uncover a {\it partial}
convection state in which a pair of convection rolls is found to coexist with a
Leidenfrost-like state. The crucial role of the relative number density of two
species on controlling the buoyancy-driven granular convection is demonstrated.
A possible model for spontaneous horizontal segregation is suggested based on
anisotropic diffusion
Estimation of losses for adobe buildings in Pakistan
Adobe buildings are vulnerable to seismic forces. Large scale destructions and casualties have been caused due
to the collapse of adobe buildings during the past earthquakes. A significant number of adobe structures exist in
different parts of Pakistan, similar to other parts of the world. Since Pakistan lies in a seismic active region, it is
necessary to assess the level of vulnerability of these buildings in order to estimate associated losses during a
seismic event. This paper presents the results of a study which was conducted to quantify damages to adobe
buildings based on their fragility curves. The adobe buildings were found to be highly vulnerable to low intensity
earthquakes. The vulnerability of these buildings has been compared with the European adobe buildings. It was
noted that Pakistani adobe buildings were slightly less resistant to earthquakes as compared to similar buildings
in Europe. Retrofitting solutions were suggested in order to increase the seismic capacity of adobe buildings in
Pakistan
Assessment of seismic performance of adobe structures in Pakistan and Portugal
Adobe buildings exist in different parts of the world. The construction of these buildings can be carried out
economically, using locally available materials and skills that do not require use of modern machinery.
Therefore, adobe buildings provide an economic housing option. The construction of adobe structures is carried
out based on traditional construction practices which vary from region to region. This paper presents the results
of a study which was conducted to study the construction practices of adobe buildings in Pakistan and Portugal
in the context of their seismic vulnerability. The adobe buildings in both these countries were found to be
subjected to seismic hazard levels which, although is low in some regions, may cause significant damages. Lack of essential elements or details for the adequate seismic performance was found in the adobe buildings in both regions
Interplay of chemical pressure and hydrogen insertion effects in from first principles
Investigations within the local spin density functional theory (LSDF) of the
intermetallic hydride system were carried out for discrete
model compositions in the range . The aim of this
study is to assess the change of the cerium valence state in the neighborhood
of the experimental hydride composition, . In agreement
with experiment, the analyses of the electronic and magnetic structures and of
the chemical bonding properties point to trivalent cerium for . In contrast, for lower hydrogen amounts the hydride system stays in an
intermediate-valent state for cerium, like in . The influence
of the insertion of hydrogen is addressed from both the volume expansion and
chemical bonding effects. The latter are found to have the main influence on
the change of Ce valence character. Spin polarized calculations point to a
finite magnetic moment carried by the Ce states; its magnitude increases
with in the range
Quenching of light hadrons at RHIC in a collisional energy loss scenario
We evaluate the nuclear suppression factor, for light hadrons
by taking into account the collisional energy loss. We show that in the
measured domain of RHIC the elastic process is the dominant mechanism for
the partonic energy loss.Comment: 4 pages with 3 figures, Quark Matter 2008 Proceeding
Band heterotopia
Band heterotopias are one of the rarest groups of congenital disorder that result in variable degree of structural abnormality of brain parenchyma. Band of heterotopic neurons result from a congenital or acquired deficiency of the neuronal migration. MRI is the examination of choice for demonstrating these abnormalities because of the superb gray vs. white matter differentiation, detail of cortical anatomy and ease of multiplanar imaging. We report a case of band heterotopia that showed a bilateral band of gray matter in deep white matter best demonstrated on T2 Wt. and FLAIR images
Analisis Pendapatan dan Nilai Tambah Keripik Nangka pada Industri Rumah Tangga Tiara di Kota Palu
Melalui agroindustri, pengolahan buah nangka dapat meningkatkan nilai tambahnya. Sehubungan dengan hal tersebut, maka dilakukanlah penelitian ini dengan tujuan untuk mengetahui besarnya penerimaan, pendapatan dan nilai tambah yang diperoleh dari pengolahan buah nangka menjadi keripik nangka pada industri rumah tangga Tiara di Kota Palu. Penelitian ini dilakukan pada Bulan Juni-Agustus Tahun 2012. Penentuan sampel dalam penelitian ini ditetapkan secara purposive, karena industri rumah tangga Tiara merupakan industri yang berproduksi secara kontinyu dan produksinya besar. Responden sebanyak 4 orang, yaitu 1 orang pimpinan dan 3 orang tenaga kerja. Jenis data yang digunakan adalah data primer yang diperoleh dengan wawancara dan data sekunder dari instansi terkait. Data yang terkumpul selanjutnya dianalisis dengan analisis pendapatan dan analisis nilai tambah metode Hayami. Hasil penelitian menunjukan bahwa penerimaan yang diperoleh industri rumah tangga Tiara dalam memproduksi keripik nangka selama Bulan Juli Tahun 2012 sebesar Rp. 58.500.000, pendapatan sebesar Rp. 36.307.614,25 dan nilai tambah sebesar Rp. 33.169/kg
Experimental determination of the state-dependent enhancement of the electron-positron momentum density in solids
The state-dependence of the enhancement of the electron-positron momentum
density is investigated for some transition and simple metals (Cr, V, Ag and
Al). Quantitative comparison with linearized muffin-tin orbital calculations of
the corresponding quantity in the first Brillouin zone is shown to yield a
measurement of the enhancement of the s, p and d states, independent of any
parameterizations in terms of the electron density local to the positron. An
empirical correction that can be applied to a first-principles state-dependent
model is proposed that reproduces the measured state-dependence very well,
yielding a general, predictive model for the enhancement of the momentum
distribution of positron annihilation measurements, including those of angular
correlation and coincidence Doppler broadening techniques
Aplikasi Pemilihan Rute Alternatif Akibat Kemacetan Lalu Lintas di Kota Makassar Menggunakan Google API dan ASP.Net
Persoalan kemacetan yang semakin parah di Kota Makassar saat ini perlu segera diatasi. Penelitian ini berusaha memberikan sebuah solusi aplikasi pemilihan rute alternatif untuk mengatasi kemacetan. Aplikasi ini dapat menampilkan lokasi kemacetan yang sedang terjadi beserta jalur alternatif yang memungkinkan untuk dilalui agar terhindar dari kemacetan tersebut. Rute alternatif diperoleh berdasarkan layanan yang telah disediakan oleh Google API. Sistem ini menggunakan beberapa bahasa pemrograman sesuai jenis aplikasinya. Penentuan titik kemacetan dilakukan melalui telepon seluler dengan aplikasi berbasis android menggunakan bahasa pemrograman eclipse. Sementara itu, aplikasi untuk mendesain rute alternatif menggunakan Active Server Pages (ASP.Net). ASP.Net dikompilasi dan berbasis .Net framework sehingga dapat membuat aplikasi dalam berbagai macam bahasa yang mendukung .Net. Pengujian hasil implementasi sistem dilakukan dengan menggunakan metode black box. Hasil pengujian pada setiap halaman utama menunjukkan bahwa keluaran yang dihasilkan melalui beberapa skenario pengujian sudah sesuai dengan yang diharapkan yang berarti halaman-halaman tersebut dapat berjalan dengan baik
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