864 research outputs found

    Entanglement fidelity for electron-electron interaction in strongly coupled semiclassical plasma and under external fields

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    This paper presents the effects of AB-flux field and electric field on electron-electron interaction, encircled by a strongly coupled semiclassical plasma. We found that weak external fields are required to perpetuate a low-energy elastic electron-electron interaction in a strongly coupled semiclassical plasma. The entanglement fidelity in the interaction process has been examined. We have used partial wave analysis to derive the entanglement fidelity. We found that for a weak electric field, the fidelity ratio for electron-electron interaction increase as projectile energy increase but remains constant or almost zero for a strong electric field. Our results provide an invaluable information on how the efficiency of entanglement fidelity for a low-energy elastic electron-electron interaction in a strongly coupled semiclassical plasma can be influenced by the presence of external fields

    Penerapan Model Kooperatif Student Teams Achievement Divisions untuk Meningkatkan Hasil Belajar Siswa

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    Penelitian ini bertujuan untuk mengetahui peningkatan hasil belajar siswa padapembelajaran matematika dengan menerapkan model pembelajaran kooperatif Tipe STADdengan pendekatan matematika realistik di kelas VIIA semester gasal Tahun Ajaran 2015/2016.Penelitian ini merupakan Penelitian Tindakan Kelas (PTK) yang terdiri dari 2 siklus, denganmenerapkan model pembelajaran Kooperative Tipe STAD dengan pendekatan matematikarealistik. Subjek penelitian ini adalah seluruh siswa kelas VIIA SMP Negeri 3 Tinambung. Teknikpengumpulan data penelitian hasil belajar siswa dilakukan dengan mengunakan tes sedangkanaktivitas belajar siswa mengunakan lembar observasi. Teknik analisis data yang digunakanadalah analisis deskriptif yakni menjelaskan arah Perubahan peningkatan hasil belajar siswadalam penerapan model pembelajaran Kooperatif Tipe STAD dengan pendekatan matematikarealistik. Dari analisis data dengan penerapan model pembelajaran Kooperative Tipe STADdengan pendekatan matematika realistik, Pada siklus I rata-rata keterlaksanaan pembelajaransebesar (70,00%), rata-rata aktivitas belajar siswa sebesar (57,89%), serta diperoleh skor rataratahasil belajar siswa sebesar 67 dan pada siklus II rata-rata keterlaksanaan pembelajaransebesar (95,00%), rata-rata aktivitas belajar siswa sebesar (86,87%), serta deperoleh skor rataratahasil belajar siswa sebesar 80, dari data tersebut terlihat bahwa terdapat peningkatanketerlaksanaan pembelajaran dari siklus I ke siklus II sebesar (25,00%), terjadi peningkatanaktivitas belajar siswa siklus I ke siklus II sebesar (28,95%), serta peningkatan ketuntasanbelajar siswa dari siklus I ke siklus II sebesar (23,81%). Pada siklus II ini telah tercapaiindikator ketuntasan belajar yang ditetapkan, jika paling sedikit 70% dari jumlah siswa dalamkelas telah mencapai ketuntasan ≥ 70% tujuan pembelajaran. Hasil penelitian ini membuktikanbahwa penerapan model pembelajaran Kooperative Tipe STAD dengan pendekatan matematikarealistik dapat meningkatkan aktivitas dan hasil belajar matematika siswa kelas VIIA SMPNegeri 3 Tinambung

    Ring opening polymerization of lactides and lactones by multimetallic alkyl zinc complexes derived from the acids Ph₂C(X)CO₂2H (X = OH, NH₂ )

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    The reaction of the dialkylzinc reagents R₂Zn with the acids 2,2-Ph₂C(X)(CO₂H), where X = NH₂, OH, i.e. 2,2′-diphenylglycine (dpgH) or benzilic acid (benzH2), in toluene at reflux temperature afforded the tetra-nuclear ring complexes [RZn(dpg)]₄, where R = Me (1), Et (2), 2-CF₃C₆H₄ (3), and 2,4,6-F₃C₆H₂ (4); complex 2 has been previously reported. The crystal structures of 1·(2MeCN), 3 and 4·(4(C₇H₈)·1.59(H₂O)) are reported, along with that of the intermediate compound (2-CF₃C₆H₄)3B·MeCN and the known compound [ZnCl₂(NCMe)₂]. Complexes 1–4, together with the known complex [(ZnEt)₃(ZnL)₃(benz)₃] (5; L = MeCN), have been screened, in the absence of benzyl alcohol, for their potential to act as catalysts for the ring opening polymerization (ROP) of ε-caprolactone (ε-CL), δ-valerolactone (δ-VL) and rac-lactide (rac-LA); the co-polymerization of ε-CL with rac-LA was also studied. Complexes 3 and 4 bearing fluorinated aryls at zinc were found to afford the highest activities

    Extracorporeal membrane oxygenation simulation-based training: methods, drawbacks and a novel solution

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    Introduction: Patients under the error-prone and complication-burdened extracorporeal membrane oxygenation (ECMO) are looked after by a highly trained, multidisciplinary team. Simulation-based training (SBT) affords ECMO centers the opportunity to equip practitioners with the technical dexterity required to manage emergencies. The aim of this article is to review ECMO SBT activities and technology followed by a novel solution to current challenges. ECMO simulation: The commonly-used simulation approach is easy-to-build as it requires a functioning ECMO machine and an altered circuit. Complications are simulated through manual circuit manipulations. However, scenario diversity is limited and often lacks physiological and/or mechanical authenticity. It is also expensive to continuously operate due to the consumption of highly specialized equipment. Technological aid: Commercial extensions can be added to enable remote control and to automate circuit manipulation, but do not improve on the realism or cost-effectiveness. A modular ECMO simulator: To address those drawbacks, we are developing a standalone modular ECMO simulator that employs affordable technology for high-fidelity simulation.Peer reviewe

    Food waste handling in Malaysia and comparison with other Asian countries

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    The increasing amount of food waste in Malaysia in recent years has brought many environmental issues in the country where it affects the nation’s solid waste management framework. At the moment, the government is limited to other alternatives of food waste disposal besides the conventional landfill and incineration methods. This paper provides information on the current status of food waste handling, management, regulations, and policies in Malaysia. It helps to draw the problem and challenge to a clearer view in efforts of achieving sustainable and integrative food waste handling in the country

    {\kappa} state solutions for the fermionic massive spin-1/2 particles interacting with double ring-shaped Kratzer and oscillator potentials

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    In recent years, an extensive survey on various wave equations of relativistic quantum mechanics with different types of potential interactions has been a line of great interest. In this regime, special attention has been given to the Dirac equation because the spin-1/2 fermions represent the most frequent building blocks of the molecules and atoms. Motivated by the considerable interest in this equation and its relativistic symmetries (spin and pseudospin) in the presence of solvable potential model, we attempt to obtain the relativistic bound states solution of the Dirac equation with double ring-shaped Kratzer and oscillator potentials under the condition of spin and pseudospin symmetries. The solutions are reported for arbitrary quantum number in a compact form. the analytic bound state energy eigenvalues and the associated upper- and lower-spinor components of two Dirac particles have been found. Several typical numerical results of the relativistic eigenenergies have also been presented. We found that the existence or absence of the ring shaped potential potential has strong effects on the eigenstates of the Kratzer and oscillator particles with a wide band spectrum except for the pseudospin-oscillator particles where there exist a narrow band gap.Comment: 27 pages, 1 figur

    Calculation of a complete set of spin observables for proton elastic scattering from stable and unstable nuclei

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    A microscopic study of proton elastic scattering from unstable nuclei at intermediate energies using a relativistic formalism is presented. We have employed both the original relativistic impulse approximation (IA1) and the generalised impulse approximation (IA2) formalisms to calculate the relativistic optical potentials, with target densities derived from relativistic mean field (RMF) theory using the NL3 and FSUGold parameter sets. Comparisons between the optical potentials computed using both IA1 and IA2 formalisms, and the different RMF Lagrangians are presented for both stable and unstable targets. The comparisons are required to study the effect of using IA1 versus IA2 optical potentials, with different RMF parameter sets, on elastic scattering observables for unstable targets at intermediate energies. We also study the effect of full-folding versus the factorized form of the optical potentials on elastic scattering observables. As with the case for stable nuclei, we found that the use of the full-folding optical potential improves the scattering observables (especially spin observables) at low intermediate energy (e.g. 200MeV). No discernible difference is found at a projectile incident energy of 500 MeV. To check the validity of using localized optical potential, we calculate the scattering observables using non-local potentials by solving the momentum space Dirac equation. The Dirac equation is transformed to two coupled Lippmann-Schwinger equations, which are then numerically solved to obtain elastic scattering observables. The results are discussed and compared to calculations involving local coordinate-space optical potentials
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