An Improved Separation of Regular Resolution from Pool Resolution and Clause Learning

We prove that the graph tautology principles of Alekhnovich, Johannsen, Pitassi and Urquhart have polynomial size pool resolution refutations that use only input lemmas as learned clauses and without degenerate resolution inferences. We also prove that these graph tautology principles can be refuted by polynomial size DPLL proofs with clause learning, even when restricted to greedy, unit-propagating DPLL search

PENINGKATAN KEMAMPUAN BERFIKIR KREATIF SISWA DALAM PEMBELAJARAN IPS DENGAN MEMANFAATKAN MEDIA INFORMASI KORAN SEBAGAI SUMBER BELAJAR

Permasalahan dalam penelitian ini adalah kurangnya kemapuan peserta didik dalam berfikir kreatif ketika pembelajaran berlangsung. Untuk mengatasi pemasalahan tersebut, peneliti menggunakan media informasi koran PR sebagai penunjang dalam kegiatan pembelajaran untuk meningkatkan kemampuan berfikir kreatif. Metode penelitian yang digunakan yaitu penelitian tindakan kelas (classroom action research) dengan model Kemmis dan Taggart. Diawali dengan penyusunan RPP dan melaksanakan tindakan siklus I, siklus II, siklus III dan siklus IV. Sumber yang diambil berdasarkan observasi, catatan lapangan, catatan observasi guru, dan wawancara. Populasi dalam penelitian ini dilakukan di kelas VII SMP Negeri 10 Bandung, sedangkan sampel yang digunakan dalam penelitian ini adalah siswa kelas VII-L sebagai kelas yang dijadikan PTK. Pada siklus pertama, hasil observasi mengenai berfikir kreatif peserta didik berada pada kategori “cukup”. Pada siklus kedua, kemampuan berfikir kreatif yang dilakukan peserta didik mengalami peningkatan tetapi masih berada pada kategori “cukup”. Kemudian pada siklus ketiga, kemampuan berfikir kreatif dengan menggunakan media informasi koran mengalami peningkatan kembali dan berada pada kategori “baik”. Pada siklus keempat, sebagai siklus pembuktian berada pada kategori “baik”. Sehingga dari penelitian ini dapat disimpulkan, bahwa memanfaatkan media informasi koran PR dalam pembelajaran IPS dapat meningkatkan berfikir kreatif peserta didik.;---The problem in this research is the lack utilize learning resources affects mainly way of thinking of creative thinking. To overcome these set a problem, researchers used information media Pikiran Rakyat newspaper as a support in the learning activities to enhance the ability of creative thinking. The method used is classroom action research (classroom action research) with a model Kemmis and Taggart. Begins with the preparation of the action plan of cooperation group and implement actions I cycle, II cycle, III cycle and IV cycle. Source taken by observation, field notes, teacher observation notes, and interview. The population in this study conducted in class VII SMP Negeri 10 Bandung, while the samples used in this study were students of class VII-L as a class which is used as PTK Implementation of learning to enhance creative thinking by using newspaper information media Pikiran Rakyat within social studies learning can be said to be successful. In the first cycle, the observation of the creative thinking of students that are in the category of "enough". In the second cycle, the ability to think creatively done learners has increased but is still in the category of "enough". Then in the third cycle, the ability to think creatively using information media newspapers increased back and is in the category of "good". On the fourth cycle, as the cycle the proof is in the category of "good". So, from this study it can be concluded, that the use of the media in the learning information Pikiran Rakyat newspaper within social studies learning can enhance creative thinking of students

Oxidation-assisted alkaline precipitation : the effect of H2O2 on the size of CuO and FeOOH nanoparticles

H2O2 was demonstrated to narrow the size distribution and decrease the size of CuO and hydrous FeOOH (2-line ferrihydrite) nanoparticles under conditions of high supersaturation. We introduce oxidation-assisted alkaline precipitation (Ox-AP) and compare it to traditional alkaline precipitation (AP). While for AP, a metal salt solution (e.g., CuCl2) is mixed with an alkali (e.g., NaOH), for Ox-AP, the more reduced form of that metal salt solution (e.g., CuCl) is simultaneously mixed with that alkali and an oxidant (e.g., H2O2). The resulting precipitates were characterized with SEM, XRD, DLS and single particle ICP-MS and shown to be nanoparticles (NPs). Ox-AP CuO NPs were up to 3 times smaller than AP NPs. Ox-AP FeOOH NPs were up to 22.5% smaller than AP NPs. We discuss and propose a possible mechanism of Ox-AP through careful consideration of the known reaction chemistry of iron and copper. We propose that an increased monomer formation rate enhances the nucleation rate, which ultimately results in smaller particles with a more narrow distribution. The more distinct effect of Ox-AP on copper, was attributed to the fast formation of the stable CuO monomer, compared to AP, where the Cu(OH)(2) and/or Cu-2(OH)(3)Cl monomers are more likely formed. Although, the exact mechanism of Ox-AP needs experimental confirmation, our results nicely demonstrate the potential of using Ox-AP to produce smaller NPs with a more narrow distribution in comparison to using AP

Hazard Perception and Reporting

Reporting of hazards is a key aspect of safety management in industry, but relatively little empirical investigation of reporting has been undertaken. This research reports on an investigation that was carried out in the Science gallery at Trinity College Dublin to explore the detection and reporting of hazards by members of the public. Three simulated hazards were developed and placed around the risk lab. The experiment was designed to assess the capacity to recall recognise and report hazards of the participants by means of an exit survey. Participants performed better at recognition than recollection with no actual reporting of hazards recorded. The results validated some of the findings suggested by the literature and can assist in the development of a new experimental methodology as training within organizations to improve awareness of hazards and reporting practices

A1_9 Terraforming Mars: CO2 Combustion

This report examines the feasibility of transporting coal from the Earth to Mars to increase the Martian atmospheric density. This is done by releasing CO2 through combustion, which would terraform the planet. It was found that this was unfeasible due to the large values required: 3.15 x 1019 Kg of coal and 1.97x1027 J of energy to transport it outside of the Earth’s gravitational potential

Prediction of NH4NO3 thermal decomposition parameters in the presence of two additives using the single additive experimental values

PresentationNH4NO3 thermal decomposition rate is significantly affected by the presence of additives such as Na2SO4 (an inhibitor) or KCl (a promoter). The presence of Na2SO4 increases substantially the decomposition “onset” temperature of NH4NO3; K2CO3 does the same, while KCl reduces the same parameter. In this work the effect of individual additives on characteristic thermal decomposition parameters of NH4NO3 have been correlated and used to predict the respective parameters when two additives are present simultaneously. A simple model predicting the effect of mixtures of additives on the “onset” temperature and the temperature rise due to the thermal decomposition of AN, using the same data from the individual compounds was developed. The results showed that the behavior of each compound is independent from that of the others. The model predicts well To and Tf of such mixtures of additives

A1_7 Hunting for Monopoles i. A toy model for detection

Extensive searches for a magnetic monopole - the magnetic equivalent of a single electric charge - have been ongoing since they were first predicted by Paul Dirac in 1931. Despite strong theoretical foundations, these mysterious particles have never been detected with strong confidence. In this paper, we take advantage of Faraday's law to present a method for such searches: a monopole passing through a wire loop induces a current, which we calculate

A1_1 The Flat Earth's Escape Velocity

In some models, the Earth is considered to be a flat cylinder. Here we calculate the escape velocity for such a matter distribution and find that it is similar to the standard sphere. This result is briefly discussed and we show that, for large distances, the force from such a planet would tend to that from a sphere as expected