Effect of disorder on the electronic properties of graphene: a theoretical approach

In order to manipulate the properties of graphene, its very important to understand the electronic structure in presence of disorder. We investigate, within a tight-binding description, the effects of disorder in the on-site (diagonal disorder) term in the Hamiltonian as well as in the hopping integral (off-diagonal disorder) on the electronic dispersion and density of states by augmented space recursion method. Extrinsic off-diagonal disorder is shown to have dramatic effects on the two-dimensional Dirac-cone, including asymmetries in the band structures as well as the presence of discontinuous bands in certain limits. Disorder-induced broadening, related to the scattering length (or life-time) of electrons, is modified significantly with the increasing strength of disorder. We propose that our theory is suitable to study the effects of disorder in other 2D materials, e.g., a boron nitride monolayer.Comment: 11 pages, 8 figure

Integration Of Mobile Based Queuing Systems

The amount of time and energy that is wasted if people queue for public services is a serious problem. More ever if that queuing done by busy or sick people. Because of busyness, a person sometimes has to complete several matters at different places in short period of time. Therefore we need a queuing system that is able to integrate all queuing services so that the public can do all queuing processes with more comfort without having to cram into a queue. In addition, by integrating all community queuing services can get services in several places just by registering through one application. The working system of this application is to distribute information on service position and estimated waiting time through an application. To design the system, a survey was carried out in several public service facilities in the cities of Makassar and Gowa Regency. Beside that, literature studies also were carried out on similar papers. System analysis and design using the SDLC method include planning, system analysis and system design. It is expected that the results of this design can become a model that can be used as an appropriate reference to implement integration of mobile-based online queuing systems

Potensi Penggunaan Koneksi Internet Instansi Pemerintah Bersama Masyarakat di Kota Makassar

Saat ini hampir seluruh instansi pemerintah maupun swasta telah melakukan penyewaan koneksi internet untuk memenuhi kebutuhan informasi masing-masing tak terkecuali pemerintah kota Makassar. Dengan sistem pembayaran dan pemakaian internet bulanan membuat instansi pemerintah tetap mendapatkan koneksi internet diluar jam kantor atau hari libur. Hal ini minimbulkan kemubassiran mengingat pada waktu-waktu tersebut koneksi internet tidak termanfaatkan sementara kebutuhan masyarakat akan akses internet belum tercukupi dengan baik. Berdasarkan hal itu maka penelitian ini dilakukan dengan tujuan untuk mengetahui potensi bandwidth internet instansi, Sumber Daya Manusia (pengelola jaringan), kebiasaan manajemen jaringan,waktu dan tanggapan terhadap ide pemakaian internet bersama masyarakat diluar jam kantor dan hari libur. Penelitian ini dilakukan melalui wawancara dan observasi secara langsung di 12 instansi pemerintah kota Makassar. Data yang diperoleh dianalisis secara kualitatif untuk menggambarkan potensi-potensi tersebut. Potensi bandwidth internet instansi adalah sebesar 26,5 MBps, terdapat 5 instansi yang terbiasa melakukan manajemen dan monitoring bandwidth dan hanya 3 instansi terbiasa melakukan filtering website. Ketersediaan pengelola jaringan sudah 100% dengan 85% yang berlatar belakang pendidikan teknologi informasi, potensi waktu rata-rata 15-16 jam perhari dan 24 jam pada hari libur. Sepuluh dari dua belas instansi setuju apabila penggunaan internet bersama masyarakat diimplementasikan

Pengaruh Motivasi Terhadap Kinerja Pegawai Dinas Energi Dan Sumber Daya Mineral Kabupaten Mamuju Utara

The aim of this study; (1) untuk mengetahui and analyze the influence of intrinsic and extrinsic motivation simultaneously on the performance of employees at the Department of Energy and Mineral Resources of North Mamuju regency; (2) to assess and analyze the effect of intrinsic motivation partially on the performance of employees at the Department of Energy and Mineral Resources of North Mamuju regency; (3) to mengetahui menganalisis pengaruh extrinsic motivation partially on the performance of employees at the Department of Energy and Mineral Resources of North Mamuju regency. This type of research inikuantitatif. Population research staff at the Department of Energy and Mineral Resources of North Mamuju regency totaling 40 people with census sampling techniques so that the entire population sampled. Data collection techniques including observation, questionnaires, and documentation, and data analysis technique multiple linear regression. The results showed; (1) There is the influence of intrinsic and extrinsic motivation simultaneously on the performance of employees at the Department of Energy and Mineral Resources of North Mamuju regency with the influence of 62.9% and the level of the strong relationship between variables; (2) There is the influence of intrinsic motivation partially on the performance of employees at the Department of Energy and Mineral Resources of North Mamuju regency. Intrinsic motivation in this research are influenced by the recognition as recognition of the work ability, whereas the intrinsic motivation of employees who have indicated is a matter of individual responsibility as the completion of the work not on time; (3) There is the influence of motivation eksrinsik partially on the performance of employees at the Department of Energy and Mineral Resources of North Mamuju regency. Extrinsic motivation in this research are influenced by incentives, while extrinsic motivation is the employee who has not obtained adequate working facilities used

Interplay of chemical pressure and hydrogen insertion effects in CeRhSn {\bf CeRhSn} from first principles

Investigations within the local spin density functional theory (LSDF) of the intermetallic hydride system ${\rm CeRhSnH_x}$ were carried out for discrete model compositions in the range $0.33 \leq x_H \leq 1.33$. The aim of this study is to assess the change of the cerium valence state in the neighborhood of the experimental hydride composition, ${\rm CeRhSnH_{0.8}}$. In agreement with experiment, the analyses of the electronic and magnetic structures and of the chemical bonding properties point to trivalent cerium for $1 \leq x_H \leq 1.33$. In contrast, for lower hydrogen amounts the hydride system stays in an intermediate-valent state for cerium, like in ${\rm CeRhSn}$. 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 $4f$ states; its magnitude increases with $x_H$ in the range $1 \leq x_H \leq 1.33$

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 ($F$) for a range of shaking acceleration ($\Gamma$). All patterns as well as the related phase-diagram in the ($\Gamma, F$)-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

Pandangan Al-ghazali Mengenai Pendidikan Akliah (Tinjauan Teoretis Dan Filosofis)

Bahasa Indonesia:Artikel ini bertujuan untuk menjelaskan pandangan Al-Ghazali mengenai pendidikan akliah dalam Islam. Dalam pandangannya, Islam memberikan penghargaan yang tinggi terhadap akal. Banyak dari ayat Al-Qur\u27an dan Hadits Nabi yang menganjurkan dan mendorong manusia untuk mempergunakan akalnya dan banyak berpikir guna mengembangkan intelektualnya. Merujuk kepada ayat-ayat Al-Qur\u27an yang di dalamnya terdapat berbagai kata seperti dabbara, naz{ara, faqiha, tafakkara, ‘aqala, Al-Ghazali mengkaitkan kegunaan akal dengan kekuatan daya pikirnya. Pendekatan yang digunakan berbasis teoritis dan filosofis, dengan merujuk kepada ayat Qur\u27an yang berkaitan dengan keunggulan akal dalam skala makro berpikir manusia, serta pendapat para tokoh. Hasil dari pembahasan didapatkan, bahwa akallah yang menemukan isyarat-isyarat ilmu pengetahuan yang dalam tahap selanjutnya dapat memperkokoh keimanan, keyakinan dan ketakwaan kepada Allah SWT. Akal adalah sumber ilmu pengetahuan, teknologi dan kebudayaan yang dipergunakan untuk menciptakan alat-alat yang berguna dan menghadapi problem-problem manusia. Al-Ghazali menghendaki perkembangan akal, disamping ingin menjauhkan manusia dari manusia yang individualis, materialis dan pragmatis. Beliau menghendaki adanya keseimbangan antara kemajuan akal dan penghayatan spiritual, keseimbangan antara kegunaan dan kebenaran, sehingga pendidikan yang dicapai tidak hanya memiliki, tetapi juga memuat azas tanggung jawab kepada Tuhan, pencipta akal.English:This article aims to describe the view of Al-Ghazali on the nonsensical education in Islam. Al-Ghazali argues that Islam gives high appreciation of reason. Many of the verse of the Qur\u27an and the Hadith of the Prophet who was advocate and encourage people to use their minds and a lot of thinking to develop intellectually. Referring to the verses of the Qur\u27an in which there are various words such as dabbara, naz{ara, faqiha, tafakkara, ‘aqala, Al-Ghazali linking USAbility sense with the power of thought. The approach based on the theoretical and philosophic, with reference to the Qur\u27anic verses related to the sense of excellence in the macro-scale human thought, and scholars opinion. The conclution of this article, intellect which find cues science in the later stage can strengthen faith, belief and devotion to God Almighty. Intellect is the source of science, technology and culture which are used to create tools that are useful and faced with the problems of man. Al-Ghazali requires the development of reason, in addition to want to keep people from the man individualist, materialist and pragmatic. He calls for a balance between progress and appreciation of spiritual sense, a balance between USAbility and truth, then education is achieved not only have, but also includes the principle of responsibility to God, the creator of sense

Pengaruh Faktor-faktor Produksi terhadap Tingkat Profitabilitas Pengrajin Batu Bata di Talang Jambe Kota Palembang

This study was conducted to determine the effect of Labor, Clay and machine against a brick craftsman level of profitability in the Gutters Jambe Palembang. This study uses interview techniques. The variables in this study are labor, raw materials and profitability. The analysis used. The analysis used in this study is multiple regression analysis. The result explained that the correlation coefficient (R) was 0.923. The independent variables can describe escara integrative variable bound by contributing 92.3%. Besidesthe F value was significant. It can be concluded tenag labor, raw materials and machinery has an influence on the profitability of Bricks Craftsmen

Quenching of light hadrons at RHIC in a collisional energy loss scenario

We evaluate the nuclear suppression factor, $R_{AA}(p_T)$ for light hadrons by taking into account the collisional energy loss. We show that in the measured $p_T$ 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