Electromagnetic fluctuation-induced interactions in randomly charged slabs

Randomly charged net-neutral dielectric slabs are shown to interact across a featureless dielectric continuum with long-range electrostatic forces that scale with the statistical variance of their quenched random charge distribution and inversely with the distance between their bounding surfaces. By accounting for the whole spectrum of electromagnetic field fluctuations, we show that this long-range disorder-generated interaction extends well into the retarded regime where higher-order Matsubara frequencies contribute significantly. This occurs even for highly clean samples with only a trace amount of charge disorder and shows that disorder effects can be important down to the nano scale. As a result, the previously predicted non-monotonic behavior for the total force between dissimilar slabs as a function of their separation distance is substantially modified by higher-order contributions, and in almost all cases of interest, we find that the equilibrium inter-surface separation is shifted to substantially larger values compared to predictions based solely on the zero-frequency component. This suggests that the ensuing non-monotonic interaction is more easily amenable to experimental detection. The presence of charge disorder in the intervening dielectric medium between the two slabs is shown to lead to an additional force that can be repulsive or attractive depending on the system parameters and can, for instance, wash out the non-monotonic behavior of the total force when the intervening slab contains a sufficiently large amount of disorder charges.Comment: 9 pages, 5 figure

Growth Profile and fatty acid accumulation of four Chaetoceros Taxa isolated from coastal water of Pahang, Malaysia

This indoor study was aimed to analyze the production of fatty acids with their growth profile from few marine algae under the genus Chaetoceros isolated from coastal water of Pahang, Malaysia. The algae were established into culture using standard marine media (f/2 media) and the variation of fatty acid for each species was determined using GCMS. Statistical analysis of one-way ANOVA was performed to evaluate the significant and homogeneity data on the growth of each alga and total fatty acid percentage obtained. The results showed that four taxa were successfully cultivated and identified as Chaetoceros baculites, Chaetoceros anastomosans, Chaetoceros affinis var. willei and Chaetoceros affinis var. affinis. Out of four Chaetoceros, C. baculites showed the highest growth rate (0.75 cell.day-1) and division’s value (1.08) while C. anastomosans showed the highest doubling time value (8.66). Statistical analysis showed that all species have significantly different growth rate (p<0.05). Myristic acid was the main component for fatty acid storage for C. baculites, C. anastomosans and C. affinis var. willei whereas palmitic acid for C. affinis var. affinis. All species contained about 35 to 75% of total percentage fatty acids throughout the growth day. Based on total percentage, both affinis varieties had high fatty acid percentage compared with the other two species with the total percentage of more than 70%. As a conclusion, all four taxa are suitable to be used in lipid industry in Malaysia with C. affinis var. affinis is the best candidate for bio-fuel industry and C. anastomosans for pharmaceutical industry

Implementasi Peraturan Daerah Nomor 11 Tahun 2018 Tentang Pengelolaan Barang Milik Daerah

The purpose of the study was to find out how the implementation of Regional Regulation Number 11 of 2018 concerning the Management of Regional Property, the problem of assets, especially motor vehicles controlled by users who have moved from the previous Regional Equipment Work Unit to a new office and have not reported these assets. The method used is qualitative descriptive and uses data collection techniques and tools in the form of observation, interviews, and documentation. The data analysis techniques used are data reduction, data presentation, and conclusion drawing. The results of the research conducted, that the implementation of Regional Regulation Number 11 of 2018 concerning the Management of Regional Property has not gone well. Regarding communication related to the implementation of regional regulations on the management of regional property, there are still annual records that cannot all be detected, making it difficult to find data. In terms of resources, there are still many asset users who are not aware of reporting to the asset field, similarly, the resources actually needed for asset management are still insufficient, there is a lack of archivists as managers of Regional Property records, there are only archivists and staff who do not have archival training. The bureaucratic structure has so far gone well enough that there are no significant problems

Non-monotoic fluctuation-induced interactions between dielectric slabs carrying charge disorder

We investigate the effect of monopolar charge disorder on the classical fluctuation-induced interactions between randomly charged net-neutral dielectric slabs and discuss various generalizations of recent results (A. Naji et al., Phys. Rev. Lett. 104, 060601 (2010)) to highly inhomogeneous dielectric systems with and without statistical disorder correlations. We shall focus on the specific case of two generally dissimilar plane-parallel slabs, which interact across vacuum or an arbitrary intervening dielectric medium. Monopolar charge disorder is considered to be present on the bounding surfaces and/or in the bulk of the slabs, may be in general quenched or annealed and may possess a finite lateral correlation length reflecting possible `patchiness' of the random charge distribution. In the case of quenched disorder, the bulk disorder is shown to give rise to an additive long-range contribution to the total force, which decays as the inverse distance between the slabs and may be attractive or repulsive depending on the dielectric constants of the slabs. We show that in the case of two dissimilar slabs the net effect due to the interplay between the disorder-induced and the pure van der Waals interactions can lead to a variety of unusual non-monotonic interaction profiles between the dielectric slabs. In particular, when the intervening medium has a larger dielectric constant than the two slabs, we find that the net interaction can become repulsive and exhibit a potential barrier, while the underlying van der Waals force is attractive. On the contrary, when the intervening medium has a dielectric constant in between that of the two slabs, the net interaction can become attractive and exhibit a free energy minimum, while the pure van der Waals force is repulsive. Therefore, the charge disorder, if present, can drastically alter the effective interaction between net-neutral objects.Comment: 13 pages, 8 figure

Variant Domination Types for a Complete h-ary Tree

يعتبر البيان أداة جيدة  لحلول بعض مشاكل الشبكات. من هذة المشاكل هي مسالة الهيمنة في الشبكات والتي تدرس عن طريق نظرية البيانات بعد تحويل الشبكة الي بيان الذي هو مجموعة من الرؤوس مع مجموعة من الحافات التي تربط بين هذه الرؤوس.  اي مجموعة جزيئة من رؤوس البيان هي مجموعة هيمنة في البيان اذا كان اي راس في البيان اما ينتمي لمجموعة الهيمنة او له جوار في هذه المجموعة. رقم الهيمنة هو قياس اصغر مجموعة تهيمن على البيان. لأهمية هذا الموضوع في مختلف المجالات ، انواع مختلف من الهيمنة في البيانات تم استخدامها في هذا البحث. وذلك بوضع شرط على مجموعة الهيمنة او شرط على مجموعة باقي رؤوس البيان او على المجموعتين. في هذا البحث تم اختيار نوعين من الهيمنة . الاول هو الهيمنة المقيدة حيث الشرط وضع على مجموعة الرؤوس خارج المجموعة المقيدة . اما النوع الثاني وهو الهيمنة الآمنة وهي المجموعة المهيمنة مع وضع شرط على المجموعة المهيمنة. تم دراسة الهيمنة الآمنة مع  انواع مختلفة من الهيمنة المقيدة على عائلة من الاشجاروهي اشجار شعاع الجذر المتكامل ذو العمق .Graph  is a tool that can be used to simplify and solve network problems. Domination is a typical network problem that graph theory is well suited for. A subset of nodes in any network is called dominating if every node is contained in this subset, or is connected to a node in it via an edge. Because of the importance of domination in different areas, variant types of domination have been introduced according to the purpose they are used for. In this paper, two domination parameters the first is the restrained and the second is secure domination have been chosn. The secure domination, and some types of restrained domination in one type of trees is called complete ary tree  are determined

TEACHERS’ PERCEPTION OF PROFESSIONAL DEVELOPMENT AT SECONDARY SCHOOL LEVEL: A QUALITATIVE STUDY

Professional development is the most effective and powerful skill to increase the learners’ needs and then make them able to acquire these tools to complete their learning criteria. It works to fulfill the requirement of a teacher to meet with the effective teaching styles. This study aims to examine the secondary school teachers’ perceptions about professional development, its importance in teaching practices and why it has been declared an instrument to get the students’ learning outcomes. For this purpose, we opted semi-structured interviews for the collection of data. The total 13 participants participated in this study. The findings of the study revealed that the professional development affects teacher’s classroom practices and enhances the learning achievement of students. The findings also showed that the continuous professional development induces teachers to improve their teaching competencies to meet the need of learners as per educational demands and the relevance of teacher efficacy for their effectiveness, as related to powerful CPD experiences. Moreover, school embedded professional learning opportunities can thus answer to self-direct desires for instructional change, which afterwards provide the motivational efforts to sustain and overcome the hurdles. Further, discussion and suggestions are given.  Article visualizations

Vaginal Birth After Previous Caesarean Section

The proportion of women who attempt vaginal birth after prior cesarean delivery has   decreased mainly because of the concern about safety.  The purpose of this study is to observe maternal & neonatal outcomes in women delivered either by vaginal birth after caesarean section, elective repeat caesarean section or failed trial of labour. To design a definite protocol for selection of patient to achieve successful vaginal birth after caesarean (VBAC) section. A prospective observational study was set at Sulaimani Maternity Teaching Hospital/ Kurdistan region of Iraq, from first July 2013 to first July 2014. In which 200 pregnant women (with one prior caesarean section & singleton, term, cephalic presentation) were enrolled, followed up during labour & puerperium for maternal & neonatal complications.  Data analysis was performed using the statistical software namely (SPSS   version 20). Planned vaginal birth was successful in 63.4% of pregnant women, with the least maternal and neonatal complication, apart from 3rd degree perineal tear (2.3%) which was statistically significant (probability value 18months, non-recurrent cause of previous scar and estimated fetal weight of < 4kg, had more successful VBAC rate

PENERAPAN MODEL PEMBELAJARAN REALISTIC MATHEMATICSEDUCATION (RME) TERHADAP PENINGKATAN KEMAMPUAN REPRESENTASI MATEMATIS SISWA

Penelitian ini didasarkan pada kemampuan representasi matematis siswa yang masih rendah.Penelitian ini bertujuan untuk mengetahui kemampuan representasi matematis siswa setelah diterapkan model pembelajaran Realistic MathematicsEducation pada materi menyelesaikan soal cerita Sistem Persamaan Linear DuaVariabel menggunakan metode grafik dan bagaimana peningkatan kemampuan representasi matematis siswa setelah diterapkan model pembelajaran tersebut.Metode yang digunakan adalah metode deskriptif dengan desain penelitian OneGroup Pretest-Posttest Design.Subjek penelitian adalah siswa kelas VIII B SMPNegeri 7 Kota Ternate. Instrumen yang digunakan: tes hasil belajar, lembar observasi kinerja guru, dan lembar observasi aktivitas siswa, dan dokumentasi. Hasil penelitian ini menunjukkan bahwa kemampuan representasi matematis siswa setelah diterapkan model pembelajaran Realistic Matehmatics Education mengalami peningkatan yang berada pada interpretasi sedang.   Kata Kunci: Realistic Mathematics Education,Representasi MatematisMatemati

Persistence of chloramphenicol in the fish flesh patin (Pangasius hypothalamus) and tilapia (Oreochromis niloticus)

Introduction: Increasing antibiotic resistance in bacteria is a serious global problem. This study was aimed to extract the antibiotic Chloramphenicol (CAP) from different parts of the fish flesh. Methods: Fish fleshes were excised from two commercially important fishes: Oreochromatis niloticus.(Red Tilapia) and Pangasius hypothalamus (Patin). The fleshes were chosen form head and tail region where generally antibiotics are spiked to avoid bacterial contamination while kept in cold storages of supermarkets. Each fish fleshes were weighed and spiked with 20,40,80 and 160ppm of CAP and stored at 4°C. The CAP residue from the flesh was extracted immediately after the first spiking was considered as Day-1. The whole extraction processes were done for 1,7,14 and 28 days. HPLC (High Performance Liquid Chromatography) was used to determine the presence of CAP residue in the tested fish flesh. Results: The results showed variations on the percentage of antibiotic residue recoveries at different concentration. In this study, CAP did not degrade and showed variations on the presence of antibiotic residue in the fish flesh. The recoveries of the entire CAP spiking samples ranged from 4.0% -100%. It also revealed the presence of antibiotic residue in Malaysian freshwater cultured fishes. Thus, the relevant authorities should take immediate action regarding this issue in order to prevent the harmful effects especially to human. Conclusions: Nevertheless, the study portrays that antibiotic residues can be sustained long time in the food products under storage conditions, which might have harmful effects on human when they consumed these frozen fishes