Electrophoretic Properties of Highly Charged Colloids: A Hybrid MD/LB Simulation Study

Using computer simulations, the electrophoretic motion of a positively charged colloid (macroion) in an electrolyte solution is studied in the framework of the primitive model. Hydrodynamic interactions are fully taken into account by applying a hybrid simulation scheme, where the charged ions (i.e. macroion and electrolyte), propagated via molecular dynamics (MD), are coupled to a Lattice Boltzmann (LB) fluid. In a recent experiment it was shown that, for multivalent salt ions, the mobility $\mu$ initially increases with charge density $\sigma$, reaches a maximum and then decreases with further increase of $\sigma$. The aim of the present work is to elucidate the behaviour of $\mu$ at high values of $\sigma$. Even for the case of monovalent microions, we find a decrease of $\mu$ with $\sigma$. A dynamic Stern layer is defined that includes all the counterions that move with the macroion while subject to an external electrical field. The number of counterions in the Stern layer, $q_0$, is a crucial parameter for the behavior of $\mu$ at high values of $\sigma$. In this case, the mobility $\mu$ depends primarily on the ratio $q_0/Q$ (with $Q$ the valency of the macroion). The previous contention that the increase in the distortion of the electric double layer (EDL) with increasing $\sigma$ leads to the lowering of $\mu$ does not hold for high $\sigma$. In fact, we show that the deformation of the EDL decreases with increase of $\sigma$. The role of hydrodynamic interactions is inferred from direct comparisons to Langevin simulations where the coupling to the LB fluid is switched off. Moreover, systems with divalent counterions are considered. In this case, at high values of $\sigma$ the phenomenon of charge inversion is found.Comment: accepted in J. Chem Phys., 10 pages, 9 figure

Tingkat Kerawanan Kebakaran Gambut Di Kabupaten Musi Banyuasin, Sumatera Selatan (Peat Fire Susceptibility in Musi Banyuasin District, South Sumatra)

Forest and land fire in 2015 was a catastrophe in Indonesia, as it did not only cause damage on forest ecosystem and environments, but also impacted human health and economic loss. This research aimed to identify hotspots distribution in 2014-2015 as an indicator of forest and land fire, and to analyze fire susceptibility in Musi Banyuasin district, South Sumatra. Data used for fire prone analysis consisted of land cover map, forest status, hotspots data derived from NOAA18, soil types, topography and moratorium map. Results showed that based on land function, hotspots were mostly found in production forest with hotspots density of 0.049 hotspots km-2. Based on land cover type, hotspots were mostly found in the open land (88 hotspots). Based on soil types, hotspots were mostly occurred on peat soils (180 hotspots and hotspot density 0.048 hotspot km-2). Soil type was mostly associated with hotspot occurrence. Sub-district of Bayung Lencir has the highest fire susceptibility among others. Low precipitation and El-Ninö phenomenon in 2015 were not the only drivers of peat fire. However two main current problems in the Forest Management Unit of Lalan Mangsang Mendis (e.g. illegal logging and open access) were driver factors of peat fire in the district

PERANCANGAN KAMPANYE SOSIAL LINDUNGI ANAK DARI CYBERBULLYING. Mellya Febriana Nur Hasanah 126010030

Perkembangan teknologi informasi, internet dan media sosial memberikan dampak perubahan pada perilaku manusia dalam bersosial dan berkomunikasi. Banyak anak-anak atau remaja yang menggunakan media sosial untuk saling berkomunikasi. Perkembangan tersebut dapat menimbulkan dampak buruk, komunikasi tanpa pengawasan dalam lingkup sosial akan menyebabkan berbagai macam penyimpangan, sebagai contoh yang sering kita dengar dengan istilah cyberbullying. Orang tua tidak sadar bahkan tidak paham dan mengerti cyberbullying itu apa, maka banyak dari orang tua sekarang sebagian anaknya pernah mengalami cyberbullying baik itu sebagai korban ataupun pelaku. Dalam penulisan kali ini akan membahas bagaimana cara mengatasi atau menangani cyberbullying pada anak dengan kampanye sosial. Kata Kunci : Media sosial, Cyberbullying, Orang tua, Ana

Studi Interior Rumah Tradisional Yogyakarta Dalem Mangkubumen, Dalem Notoprajan, Dalem Ngadiwinatan, Dalem Yudhonegaran, Dalem Kasatrian

Sejak awal kehidupan manusia, orang selalu mencoba untuk membuat lingkungan sekelililngnya menjadi lebih menyenangkan, lebih efisien dan lebih menguntungkan untuk mereka. Desain interior tidak lepas dari desain bangunan, walaupun penekanannya masing-masing berbeda. Dalam interior yang menjadi pokok adalah aktivitas dan tingkah laku manusia serta kebutuhannya akan ruang, sedangkan arsitektur menyangkut masalah yang lebih luas yaitu bentuk bangunan dan konstruksinya serta lingkungan fisiknya. Penelitian interior rumah tradisional belum banyak dilakukan kecuali sekedar merupakan bagian dari penelitian arsitektur. Tujuan dari penelitian ini adalah (1) Memperoleh data tentang interior rumah tradisional Jawa, khususnya Yogyakarta; (2)Mencoba mengisi kekosongan konsepsi, pendekatan dan metoda untuk perancangan interior di DIY; (3) Mencoba mengembangkan "jembatan" antara ilmu yang sangat berkaitan dengan desain interior, yaitu ilmu teknik, dan ilmu-ilmu lain seperti sosiologi, antropologi dan psikologi

Karakteristik Morfologi dan Pola Pita Izosim Varietas Mangga (Mangifera SP.) di Kabupaten Banyumas

Mangga (Mangifera indica) merupakan salah satu tanaman hortikultura yang memiliki nilai ekonomi tinggi. Untuk membedakan antara varietas mangga, penanda genetik yang digunakan karena mereka tidak dipengaruhi oleh faktor lingkungan. Salah satu penanda genetik yang sering digunakan adalah Isozim. Tujuan penelitian ini adalah untuk mengetahui pola bandeng dan variasi genetik beberapa varietas mangga dari Kabupaten Banyumas berdasarkan peroksidase isozim (PER), aspartate aminotransferase (AAT), esterase (EST), asam fosfatase (ACP). Penelitian ini dilakukan di Pabrik Laboratorium Biologi, Biologi Pusat Penelitian Ilmu, IPB, Bogor dari Juni sampai September 2012. Sampling daun dari tujuh varietas mangga dilakukan dengan purposive random sampling. Setelah eletrophoresis dan scoring, data kemudian dianalisis dengan Unweighted Pair-group Method with Arithmetic (UPGMA) under Numerical Taxonomy and Multivariate Sistem (NTSYS) version 2.20i. Hasil penelitian menunjukkan bahwa EST memiliki empat pola pita yang bermigrasi anodally. AAT memiliki lima pola banding dan ACP memiliki lima pola pita yang bermigrasi anodally. PER memiliki lima pola pita yang bermigrasi anodally dan katodally, MG4 (lokal dari indramayu mangga) tidak muncul. PER, AAT, ACP dan ACP menunjukkan pola yang berbeda dari dendogram. Kombinasi dari empat isozim menunjukkan bahwa variasi genetik antara MG4 (mangga lokal indramayu) dan MG5 (mangga lokal dari gedonggincu) adalah 79%, MG1 (lokal dari golek mangga) dan Mg3 (mangga lokal arummanis) adalah 75 %

Report of the Supersymmetry Theory Working Group

We provide a mini-guide to some of the possible manifestations of weak scale supersymmetry. For each of six scenarios we provide a brief description of the theoretical underpinnings, the adjustable parameters, a qualitative description of the associated phenomenology at future colliders, comments on how to simulate each scenario with existing event generators.Comment: Report of Snowmass Supersymmetry Theory Working Group; 14 pages plus 3 figures using latex2e and snow2e.cls; this version has corrected a number of typos from the first versio

Decline and Fall of the Standard Model?

Motivations for physics beyond the Standard Model are reviewed, with particular emphasis on supersymmetry at the TeV scale. Constraints on the minimal supersymmetric extension of the Standard Model with universal soft supersymmetry-breaking terms (CMSSM) are discussed. These are also combined with the supersymmetric interpretation of the anomalous magnetic moment of the muon. The prospects for observing supersymmetry at accelerators are reviewed using benchmark scenarios to focus the discussion. Prospects for other experiments are discussed, including the detection of cold dark matter, mu -> e gamma and related processes, as well as proton decay.Comment: Invited talk at 20th International Symposium on Lepton and Photon Interactions at High Energies, Rome, 2001, 16 pages LaTeX, 13 eps figures, uses special .cls file (included

Congenital anomalies in children of mothers taking antiepileptic drugs with and without periconceptional high dose folic acid use: a population-based cohort study

BACKGROUND: Antenatal antiepileptic drug (AED) use has been found to be associated with increased major congenital anomaly (CA) risks. However whether such AED-associated risks were different according to periconceptional high dose (5mg daily) folic acid supplementation is still unclear. METHODS: We included 258,591 singleton live-born children of mothers aged 15-44 years in 1990-2013 from The Health Improvement Network, a large UK primary care database. We identified all major CAs according to the European Surveillance of Congenital Anomalies classification. Absolute risks and adjusted odds ratios (aOR) were calculated comparing children of mothers prescribed AEDs to those without such prescriptions, stratified by folic acid prescriptions around the time of conception (one month before conception to two months post-conception). RESULTS: CA risk was 476/10,000 in children of mothers with first trimester AEDs compared with 269/10,000 in those without AEDs equating to an aOR of 1.82, 95% confidence interval 1.30-2.56. The highest system-specific risks were for heart anomalies (198/10,000 and 79/10,000 respectively, aOR 2.49,1.47-4.21). Sodium valproate and lamotrigine were both associated with increased risks of any CA (aOR 2.63,1.46-4.74 and aOR 2.01,1.12-3.59 respectively) and system-specific risks. Stratification by folic acid supplementation did not show marked reductions in AED-associated risks (e.g. for CAs overall aOR 1.75, 1.01-3.03 in the high dose folic acid group and 1.94, 95%CI 1.21-3.13 in the low dose or no folic acid group); however, the majority of mothers taking AEDs only initiated high dose folic acid from the second month of pregnancy. CONCLUSIONS: Children of mothers with AEDs in the first trimester of pregnancy have a 2-fold increased risk of major CA compared to those unexposed. We found no evidence that prescribed high dose folic acid supplementation reduced such AED-associated risks. Although statistical power was limited, prescribing of folic acid too late for it to be effective during the organogenic period or selective prescribing to those with more severe morbidity may explain these findings