Co-doping red-emitting Sr2Si5N8:Eu2+ into yellow-emitting phosphor-packaging for enhancing the optical properties of the 8500 K remote-phosphor packaging wleds

In the last decades, WLEDs attract more and more consideration in both academic and industrial purposes because of its advantages such as fast response time, environment friendliness, small size, long lifetime, and high efficiency. In this research, by doping the red-emitting Sr2Si5N8:Eu2+ phosphor particles into yellow-emitting YAG:Ce phosphor-packaging, a new recommendation for enhancing the optical properties (color uniformity, color rendering index, and lumen output) of the 8500 K remote-phosphor packaging WLEDs is presented, investigated, and demonstrated. By using Mat Lab and Light Tools software based on Mie Theory, the obtained results show that the optical properties of the 8500 K remote-phosphor packaging WLEDs significantly depended on Sr2Si5N8:Eu2+ concentration. The results have provided a potential practical recommendation for manufacturing remote-phosphor W-LEDs.Web of Science1341034102

Persepsi dan Partisipasi Petani dalam Pelaksanaan Rehabilitasi Tanaman Kakao di Kabupaten Sigi Provinsi Sulawesi Tengah

Persepsi petani terhadap suatu program merupakan landasan atau dasar utama bagi timbulnya kesediaan untuk ikut terlibat atau berpartisipasi dalam suatu program. Penelitian bertujuan: 1) Menganalisis persepsi petani, 2) Menganalisis tingkat partisipasi petani dalam pelaksanaan rehabilitasi kakao, 3) Menganalisis hubungan karakteristik internal dan eksternal dengan persepsi, serta 4) Menganalisis hubungan karakteristik internal dan eksternal dengan partisipasi petani. Penelitian dilaksanakan pada Februari-Maret 2015 di Kecamatan Palolo Kabupaten Sigi. Jumlah sampel 100 orang dan merupakan petani yang terlibat dalam program gernas kakao. Data yang digunakan dalam penelitian ini terdiri dari data primer dan data sekunder. Data yang diperoleh dianalisis secara statistik deskriptif dan statistik inferensial (Rank Spearman). Hasil penelitian menunjukkan persepsi dan tingkat partisipasi petani terhadap program gernas kakao cukup baik. Karakteristik internal yang berhubungan dengan persepsi petani adalah variabel kosmopolitan dan luas lahan garapan. Faktor eksternal yang berhubungan dengan persepsi adalah dukungan pasar, ketersediaan tenaga kerja, ketersediaan informasi, kelompok tani serta intensitas penyuluhan. Karakteristik internal yang berhubungan dengan partisipasi adalah pengalaman USAha tani, luas lahan garapan dan kosmopolitan. Faktor eksternal tidak berhubungan dengan partisipasi

Fragmented and Single Condensate Ground States of Spin-1 Bose Gas

We show that the ground state of a spin-1 Bose gas with an antiferro- magnetic interaction is a fragmented condensate in uniform magnetic fields. The number fluctuations in each spin component change rapidly from being enormous (order $N$) to exceedingly small (order 1) as the magnetization of the system increases. A fragmented condensate can be turned into a single condensate state by magnetic field gradients. The conditions for existence and the method of detecting fragmented states are presented.Comment: 4 pages, no figure

Nanostructured Materials for Solar Cells

The use of both inorganic and organic nanostructured materials in producing high efficiency photovoltaics is discussed in this paper. Recent theoretical results indicate that dramatic improvements in device efficiency may be attainable through the use of semiconductor quantum dots in an ordinary p-i-n solar cell. In addition, it has also recently been demonstrated that quantum dots can also be used to improve conversion efficiencies in polymeric thin film solar cells. A similar improvement in these types of cells has also been observed by employing single wall carbon nanotubes. This relatively new carbon allotrope may assist both in the disassociation of excitons as well as carrier transport through the composite material. This paper reviews the efforts that are currently underway to produce and characterize these nanoscale materials and to exploit their unique properties

Gender Relations and Subjective Family Well-being Among Farmer Families: a Comparative Study Between Uplands and Lowlands Areas in West Java Province, Indonesia

The objectives of this study are described as follows: (1) To examine the conditions ofsocial, economic and demographic characteristics of poor farmer families who live atuplands and lowlands areas, (2) to describe the social-cultural and agroecosystemconditions of poor farmer families who live at uplands and lowlands areas, (3) Toexplain type of gender relations of poor farmer families who live at uplands andlowlands areas, and (4) to analyze factors that influenced subjective family well-beingof poor farmer families who live at uplands and lowlands areas. The chosen researchsites were Nanggung Sub-district, Bogor District as an upland area, and West TelukJambe Sub-district, Karawang District, West Java Province as a lowland area. The totalof 189 farmer families was used for this study (n= 90 in uplands district areas, and n=99 in lowlands district areas). It was found that the conditions of social-cultural andagroecosystem differ between upland and lowland areas. In general, both upland andlowland areas gender roles on farming activities, in terms of access and control toagricultural resources, were dominated by men. Family well-being was directlyinfluenced by higher education of husband and wife, indirectly influenced by lesseconomic pressure of the family, directly influenced by higher gender relations betweenhusband and wife, and directly influenced by less or higher external support. Thus,wealthy farmer families were the family that had educated husband and wife, lesseconomic pressures, equal gender relations and partnerships, and less or more receiveexternal supports. It is recommended that the next study should add variables of familycoping strategies related to family economic pressure and gender roles between husbandand wife

Quantum Hall Ferromagnets

It is pointed out recently that the $\nu=1/m$ quantum Hall states in bilayer systems behave like easy plane quantum ferromagnets. We study the magnetotransport of these systems using their ``ferromagnetic" properties and a novel spin-charge relation of their excitations. The general transport is a combination of the ususal Hall transport and a time dependent transport with $quantized$ time average. The latter is due to a phase slippage process in $spacetime$ and is characterized by two topological constants. (Figures will be provided upon requests).Comment: 4 pages, Revtex, Ohio State Universit

Petrographic Characteristics and Depositional Environment Evolution of Middle Miocene Sediments in the Thien Ung - Mang Cau Structure of Nam Con Son Basin

This paper introduces the petrographic characteristics and depositional environment of Middle Miocene rocks of the Thien Ung - Mang Cau structure in the central area of Nam Con Son Basin based on the results of analyzing thin sections and structural characteristics of core samples. Middle Miocene sedimentary rocks in the studied area can be divided into three groups: (1) Group of terrigenous rocks comprising greywacke sandstone, arkosic sandstone, lithic-quartz sandstone, greywacke-lithic sandstone, oligomictic siltstone, and bitumenous claystone; (2) Group of carbonate rocks comprising dolomitic limestone and bituminous limestone; (3) Mixed group comprising calcareous sandstone, calcarinate sandstone, arenaceous limestone, calcareous claystone, calcareous silty claystone, dolomitic limestone containing silt, and bitumen. The depositional environment is expressed through petrographic characteristics and structure of the sedimentary rocks in core samples. The greywacke and arkosic sandstones are of medium grain size, poor sorting and roundness, and siliceous cement characterizing the alluvial and estuarine fan environment expressed by massive structure of core samples. The mixed calcareous limestone, arenaceous dolomitic limestone, and calcareous and bituminous clayey siltstone in the core samples are of turbulent flow structure characterizing shallow bay environment with the action of bottom currents. The dolomitic limestones are of relatively homogeneous, of microgranular and fine-granular texture, precipitated in a weakly reducing, semi-closed, and relatively calm bay environment

Homogeneous Fermion Superfluid with Unequal Spin Populations

For decades, the conventional view is that an s-wave BCS superfluid can not support uniform spin polarization due to a gap $\Delta$ in the quasiparticle excitation spectrum. We show that this is an artifact of the dismissal of quasiparticle interactions $V_{qp}^{}$ in the conventional approach at the outset. Such interactions can cause triplet fluctuations in the ground state and hence non-zero spin polarization at "magnetic field" $h<\Delta$. The resulting ground state is a pairing state of quasiparticles on the ``BCS vacuum". For sufficiently large $V_{qp}$, the spin polarization of at unitarity has the simple form $m\propto \mu^{1/2}$. Our study is motivated by the recent experiments at Rice which found evidence of a homogenous superfluid state with uniform spin polarization.Comment: 4 pages, 3 figure