2,017 research outputs found
Efektivitas Pendekatan Metakognisi Terhadap Penalaran Matematis Pada Matakuliah Geometri Transformasi
Mastery of geometry transformation is still low, have an impact on learning outcomes are not satisfactory. Some of it is also due to students not understand how to solve the problems of proof in geometry transformation, therefore, students should know the proper way of learning, ranging from planning to solve problems of proof. Therefore, students should be able to think how to think, so good mathematical reasoning ability is required. One approach to learning that students are aware of the way of thinking metacognitive approach. The population in this study was a sophomore Unswagati, selected by cluster sampling technique is one control and one experiment class. Data were obtained through tests of mathematical reasoning and observation sheet. Data processed by descriptive, comparative test sample t-test and regression analysis. The results showed that the effective learning of metacognitive approach to mathematical reasoning students, some indicators are met, namely (1) the mathematical reasoning students achieve classical completeness 73.33 are greater than KKM at 65, (2) the student\u27s activeness on metacognitive approach to learning with a positive effect on mathematical reasoning students by 39.60%, (3) average of mathematical reasoning student in a class experiments (average 73.33) is better than the control class (average 40.38)
Perangkat Pembelajaran Matematika Berbasis Smart (Specific, Measurable, Achievable, Realistic, and Time-bound)
Developing a teaching intruments using a modified model of 4-D (to 3D) Thiagarajan is as follows: (1) Definition, (2) Design, and (3) Development. Teaching instruments was developed (1) Syllabus, (2) Lesson Plan, (3) Module. Data obtained through the sheet validation, test learning achievement. The data were processed with descriptive and comparative analysis sample t test. Development process instruments resulted in: 1. Teaching instruments is valid after revision based on the assessment of experts and peers. Assessment results finally obtained an average value Syllabus validity 3,36; Lesson Plan 3,24; and validity module is 3,23 (highest score 4) include a valid criterion, 2. Implementation of the stated learning class student achievement test instruments with an average of 70,33 better than the learning achievement of students in the control class with an average of 60.60. Based on the results of a valid and effective teaching instruments shows the development achieved.Keywords : Teaching Instruments, SMAR
Resistive relaxation in field-induced insulator-metal transition of a (LaPr)SrMnO bilayer manganite single crystal
We have investigated the resistive relaxation of a
(LaPr)SrMnO single crystal, in
order to examine the slow dynamics of the field-induced insulator to metal
transition of bilayered manganites. The temporal profiles observed in remanent
resistance follow a stretched exponential function accompanied by a slow
relaxation similar to that obtained in magnetization and magnetostriction data.
We demonstrate that the remanent relaxation in magnetotransport has a close
relationship with magnetic relaxation that can be understood in the framework
of an effective medium approximation by assuming that the first order parameter
is proportional to the second order one.Comment: 6 pages,5 figure
Halloysite Nanotubes: Smart Nanomaterials in Catalysis
The use of clay minerals as catalyst is renowned since ancient times. Among the different clays used for catalytic purposes, halloysite nanotubes (HNTs) represent valuable resources for industrial applications. This special tubular clay possesses high stability and biocompatibility, resistance against organic solvents, and most importantly be available in large amounts at a low cost. Therefore, HNTs can be efficiently used as catalysts themselves or supports for metal nanoparticles in several catalytic processes. This review reports a comprehensive overview of the relevant advances in the use of halloysite in catalysis, focusing the attention on the last five years
Van der Waals and resonance interactions between accelerated atoms in vacuum and the Unruh effect
We discuss different physical effects related to the uniform acceleration of
atoms in vacuum, in the framework of quantum electrodynamics. We first
investigate the van der Waals/Casimir-Polder dispersion and resonance
interactions between two uniformly accelerated atoms in vacuum. We show that
the atomic acceleration significantly affects the van der Waals force, yielding
a different scaling of the interaction with the interatomic distance and an
explicit time dependence of the interaction energy. We argue how these results
could allow for an indirect detection of the Unruh effect through dispersion
interactions between atoms. We then consider the resonance interaction between
two accelerated atoms, prepared in a correlated Bell-type state, and
interacting with the electromagnetic field in the vacuum state, separating
vacuum fluctuations and radiation reaction contributions, both in the
free-space and in the presence of a perfectly reflecting plate. We show that
nonthermal effects of acceleration manifest in the resonance interaction,
yielding a change of the distance dependence of the resonance interaction
energy. This suggests that the equivalence between temperature and acceleration
does not apply to all radiative properties of accelerated atoms. To further
explore this aspect, we evaluate the resonance interaction between two atoms in
non inertial motion in the coaccelerated (Rindler) frame and show that in this
case the assumption of an Unruh temperature for the field is not required for a
complete equivalence of locally inertial and coaccelerated points of views.Comment: 8 pages, Proceedings of the Eighth International Workshop DICE 2016
Spacetime - Matter - Quantum Mechanic
Covalently modified halloysite clay nanotubes: synthesis, properties, biological and medical applications
Halloysite (HNT) is a promising natural nanosized tubular clay mineral that has many important uses in different industrial fields. It is naturally occurring, biocompatible, and available in thousands of tons at low cost. As a consequence of a hollow cavity, HNT is mainly used as nanocontainer for the controlled release of several chemicals. Chemical modification of both surfaces (inner lumen and outer surface) is a strategy to tune the nanotube's properties. Specifically, chemical modification of HNT surfaces generates a nanoarchitecture with targeted affinity through outer surface functionalization and drug transport ability from functionalization of the nanotube lumen. The primary focus of this review is the research of modified halloysite nanotubes and their applications in biological and medical fields
Properties and Structural Studies of Multi-Wall Carbon Nanotubes-Phosphate Ester Hybrids
Long chain phosphate esters bearing at least one or two aryl groups have been synthesized and used for the preparation of stable multi-walled carbon nanotube (MWCNT) hybrids. The non-covalent interaction ester/MWCNT has been in- vestigated by several techniques (SEM, UV-vis, 31P-NMR, RAMAN). The used phosphate ester derivatives demon- strated the ability to produce an excellent dispersion of MWCNT in CHCl3. The obtained dispersions showed a great stability from one to at least three weeks in the range of concentration considered. Thermal analysis showed an increase in the decomposition temperature for the hybrids with respect to pristine MWCNT
Familial hypercholesterolemia: The Italian Atherosclerosis Society Network (LIPIGEN)
Primary dyslipidemias are a heterogeneous group of disorders characterized by abnormal levels of circulating lipoproteins. Among them, familial hypercholesterolemia is the most common lipid disorder that predisposes for premature cardiovascular disease. We set up an Italian nationwide network aimed at facilitating the clinical and genetic diagnosis of genetic dyslipidemias named LIPIGEN (LIpid TransPort Disorders Italian GEnetic Network)
PMS50 Cost-Effectiveness of Multiple Anti-Osteoporotic Therapies for Secondary Fracture Prevention in Japan
Synthesis and Characterization of Halloysite-Cyclodextrin Nanosponges for Enhanced Dyes Adsorption
Inorganic-organic nanosponge hybrids based on halloysite clay and organic cyclodextrin derivatives (HNT-CDs) were developed by means of microwave irradiations in solvent-free conditions. The HNT-CDs nanomaterials characterized by FT-IR, TGA, BET, TEM, SEM, DLS, and zeta-potential have showed a hyper-reticulated network which possesses both HNT and cyclodextrin peculiarities. The new HNT-CDs nanosponge hybrids were employed as nanoadsorbents, first choosing Rhodamine B as the dye model, and furthermore for the removal of some cationic and anionic dyes, under different pH values (1.0, 4.54, and 7.4). The collected results showed that the pH solution as well as the electrostatic interactions affect the adsorption process. Factors controlling the adsorption process were discussed. The experimental adsorption equilibrium and kinetic data were best described by the Freundlich isotherm model. Excellent adsorption efficiency for cationic dyes were observed with respect to anionic ones. The results suggest that HNT-CDs nanosponge hybrids are a good nanoadsorbent for selective adsorption of cationic dyes with respect to the anionic ones from aqueous solutions
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