Dynamic simulations of water at constant chemical potential

The grand molecular dynamics (GMD) method has been extended and applied to examine the density dependence of the chemical potential of a three-site water model. The method couples a classical system to a chemical potential reservoir of particles via an ansatz Lagrangian. Equilibrium properties such as structure and thermodynamics, as well as dynamic properties such as time correlations and diffusion constants, in open systems at a constant chemical potential, are preserved with this method. The average number of molecules converges in a reasonable amount of computational effort and provides a way to estimate the chemical potential of a given model force field

Assessment of the Thermal Conductivity of BN-C Nanostructures

Chemical and structural diversity present in hexagonal boron nitride ((h-BN) and graphene hybrid nanostructures provide new avenues for tuning various properties for their technological applications. In this paper we investigate the variation of thermal conductivity ($\kappa$) of hybrid graphene/h-BN nanostructures: stripe superlattices and BN (graphene) dots embedded in graphene (BN) are investigated using equilibrium molecular dynamics. To simulate these systems, we have parameterized a Tersoff type interaction potential to reproduce the ab initio energetics of the B-C and N-C bonds for studying the various interfaces that emerge in these hybrid nanostructures. We demonstrate that both the details of the interface, including energetic stability and shape, as well as the spacing of the interfaces in the material exert strong control on the thermal conductivity of these systems. For stripe superlattices, we find that zigzag configured interfaces produce a higher $\kappa$ in the direction parallel to the interface than the armchair configuration, while the perpendicular conductivity is less prone to the details of the interface and is limited by the $\kappa$ of h-BN. Additionally, the embedded dot structures, having mixed zigzag and armchair interfaces, affects the thermal transport properties more strongly than superlattices. Though dot radius appears to have little effect on the magnitude of reduction, we find that dot concentration (50% yielding the greatest reduction) and composition (embedded graphene dots showing larger reduction that h-BN dot) have a significant effect

Extraocular Muscle Imbalance and Outcomes of Scleral Buckling Surgery for Primary Rhegmatogenous Retinal Detachment

Objective: The objective was to study the muscle imbalance, restrictive motility in unlike gazes and the outcomes of the scleral buckling surgery for rhegmatogenous retinal detachment. Study design: Prospective follow-up study Settings and duration: The study was conducted at Al-Shifa Trust Eye Hospital Rawalpindi from Aug 2015 to Jan 2016. Methodology: The patients were checked prior to surgery and two follow up visits were done afterwards. Thorough history was taken along with full orthoptic assessment and ocular motility in all four main gazes including elevation, depression, adduction and abduction. Vision, type and position of explants, site of detachment, and risk factors of detachment were also observed. Results: A total of 48 eyes of 46 patients were taken. Mean age of the study participants was 37.16±20.37 years. Horizontal, vertical and combined deviations were observed in study population. Exo deviation was most common deviation among patients. Most reported risk factors of retinal detachment included trauma, pseudophakia, aphakia and myopia. Motility limitations of all four gazes was observed and it was found out that after buckling the squint and restriction is been increased up till two months. Conclusion: Ocular restriction among the patients was observed over a period of 2 months and it depicted that encircling with sclera buckling elicited an increase in restrictive ocular motility from pre-operative to 1 week and 2 months after surgery

Numerical study of resistivity of model disordered three-dimensional metals

We calculate the zero-temperature resistivity of model 3-dimensional disordered metals described by tight-binding Hamiltonians. Two different mechanisms of disorder are considered: diagonal and off-diagonal. The non-equilibrium Green function formalism provides a Landauer-type formula for the conductance of arbitrary mesoscopic systems. We use this formula to calculate the resistance of finite-size disordered samples of different lengths. The resistance averaged over disorder configurations is linear in sample length and resistivity is found from the coefficient of proportionality. Two structures are considered: (1) a simple cubic lattice with one s-orbital per site, (2) a simple cubic lattice with two d-orbitals. For small values of the disorder strength, our results agree with those obtained from the Boltzmann equation. Large off-diagonal disorder causes the resistivity to saturate, whereas increasing diagonal disorder causes the resistivity to increase faster than the Boltzmann result. The crossover toward localization starts when the Boltzmann mean free path relative to the lattice constant has a value between 0.5 and 2.0 and is strongly model dependent.Comment: 4 pages, 5 figure

Computerized Reservation Systems Video Shoting And Photography "Horizon"

Reservation system that has been designed and which have been made then thesystem can help activities, ranging from receptionist to go to the studio and itsimplementation is no longer with the accounting manual. Reservation system that hasbeen proven using a computer services faster and more profitable in terms of thehandling of service orders and recording all transaction data

Dampak Lalu Lintas Akibat Aktivitas Best Western Coco Hotel terhadap Kinerja Ruas Jalan Basuki Rahmat Palu

Palu, the capital city of Central Sulawesi province is experiencing economic progress. Progress is shown by the supporting facilities such as one of the biggest hotel in Palu that is Best Western Coco Hotel at Basuki Rahmat Street.The existence of this hotel will increase human activities towards the hotel by using a vehicle, so that could increase the amount of vehicles in this area. The total additional volume of these vehicles can cause additional traffic load in Basuki Rahmat Street and influence its performance. This study was aims to determine the performance of Basuki Rahmat road on the existing condition and in the future without and with activity affected the hotel. The analysis conducted by using the method of Indonesian Highway Capacity Manual, 1997. In this research a survey of traffic volume, side barrier and the vehicle travel time were conducted. The survey was conducted on Thursday, September 4th 2014. Base on the result of analysis on the performance of Basuki Rahmat Street, without development for existing condition the value was obtained as DS = 0,30 and DS on 2014 condition = 0,47 by level of services (LOS) C. While the conditions of the development of the area obtained value of DS=0.31, DS condition 2014 = 0,48 by level of services (LOS) = C. The handling of road start from additional of median on the road section will continue to maintain the performance of roads in a state with a level of service B, by degree of Saturation in each direction in 2024 is 0.44 and 0.41

Pemisahan Komponen Tar Batubara dengan Kolom Fraksinasi Menggunakan Fasa Diam Zeolit-mn

Pemisahan komponen tar batubara telah dilakukan dengan menggunakan kolom fraksinasi menggunakan fasa diam zeolit-Mn. Zeolit –Mn yang digunakan berupa zeolit alam dari daerah Wonosari dengan penyisipan Mn2+ pada permukaan internal zeolit melalui proses pertukaran kation. Zeolit-Mn dibuat dengan variasi kisaran ukuran fisik yakni 20 – 28, 12 – 20, dan 8 – 12 mesh dan masing-masing ditempatkan pada kolom dengan panjang 30 cm. Tar batubara diperoleh dari hasil pirolisis batubara produksi PT Batubara Bukit Asam menggunakan reaktor pirolisis pada temperatur 500-650 oC dengan gas alir N2 pada kecepatan 100 mL/menit. Pengepakan zeolit-Mn pada kolom dilakukan tanpa pelarut. Proses pemisahan komponen tar dilakukan dengan menggunakan variasi pelarut CCl4, aseton dan etanol, sedangkan analisis komponen dilakukan dengan menggunakan kromatografi gas. Hasil penelitian menunjukkan bahwa zeolit-Mn relatif memiliki kemampuan untuk memisahkan komponen tar dan cenderung mengadsorb hidrokarbon fraksi berat. Variasi fasa gerak yang dilakukan menunjukkan bahwa fasa gerak non polar (CCl4) menghasilkan pemisahan yang relatif baik daripada fasa gerak sedikit polar (etanol) atau fasa gerak polar (aseton). Kata kunci: zeolit, tar batubara, pemisahan fraksinas

Anatomical structures and fiber morphology of new kenaf varieties

Kenaf plant is claimed as one of the fast-growing herbaceous plants with the high potential as a fiber material or lignocellulosic material. Nine kenaf varieties i.e., Q-Ping, KK60, V12, V19, V36, V132 and NS V133 and TK were introduced recently by Taman Pertanian Universiti, Universiti Putra Malaysia as one of the potential plant to replace tobacco plantation. Since, these nine kenaf varieties are new to Malaysia, therefore, there is a need to study their anatomical structures and fiber morphology as well as microscopic appearances to understand their different and similarity. Cell morphology and anatomical appearances were observed and evaluated under the image analysis system (Leitz DMRB). From the results, V19 and V12 had the wider ray among the nine varieties, whereas other varieties in their microscopic appearance were almost similar to those observed in many diffuse-porous hardwoods. The longest fiber length was observed in variety TK (2.96 mm) followed by V36. Q-ping showed the widest fiber diameter and lumen diameter amongst the nine varieties, with value of 28.64 μm in bast fiber and 28.06 μm in core diameter. However, Q-ping had the thinnest core cell wall with the thickness of 3.34 μm. In term of fiber length, all the kenaf varieties bast fiber has longer fiber than core fiber. The kenaf core of nine varieties has wider fiber diameter and fiber lumen diameter than the bast fiber. Conclusively, although kenaf exhibit similarity in some fiber morphology and anatomical structures, however, there still some distinction that can be used to differentiate these kenaf variety

Status Gizi dan Riwayat Komplikasi Kehamilan sebagai Determinan Kejadian Komplikasi Persalinan di Kab. Mamuju

Komplikasi persalinan adalah keadaan yang mengancam jiwa ibu ataupun janin karena gangguan sebagai akibat langsung dari kehamilan atau persalinan yang membutuhkan manajemen obstetri tanpa ada perencanaan sebelumnya dan merupakan salah satu penyebab terbesar kematian ibu di Indonesia, tetapi dapat dicegah melalui deteksi dini terhadap kehamilan maupun persalinan dengan risiko. Penelitian ini bertujuan menetapkan besarnya risiko (status gizi, penyakit ibu, riwayat komplikasi kehamilan, riwayat persalinan sebelumnya dengan tindakan, kualitas ANC, dan penolong persalinan), serta mengetahui variabel yang memberi risiko dominan terhadap kejadian komplikasi persalinan di Rumah Sakit Umum Daerah Kabupaten Mamuju. Desain penelitian yang digunakan adalah case control study. Penarikan sampel dilakukan dengan metode simple random sampling dengan jumlah sampel sebanyak 174 responden yang terdiri dari 58 responden untuk kasus dan 116 responden untuk kontrol pada ibu yang bersalin di lokasi penelitian dan memenuhi kriteria yang telah ditetapkan. Hasil penelitian menunjukkan dari enam variabel yang diduga berisiko terhadap kejadian komplikasi persalinan hanya ada dua yang secarasignifikan berisiko terhadap kejadian komplikasi persalinan yaitu status gizi (OR=2,862) dan riwayat komplikasi kehamilan (OR=5,587). Dari dua variabel tersebut variabel yang paling dominan berisiko terhadap kejadian komplikasipersalinan adalah riwayat komplikasi kehamilan