10,415 research outputs found
Photoluminescence and excited states dynamics of Tm<sup>2+</sup>-doped CsCa(Cl/Br)<sub>3</sub> and CsCa(Br/I)<sub>3</sub> perovskites
No full textIn this study, we systematically vary the Cl/Br and Br/I ratios in CsCaX3:Tm2+ (X = Cl, Br, I) and hereby gradually shift the positions of the Tm2+ 4f125d1-levels as relative to the two 4f13 levels. At low temperatures up to five distinct Tm2+ 4f125d1→4f13 emissions and the 4f13→4f13 emission can be observed. As the temperature increases, most of the 4f125d1→4f13 emissions undergo quenching via multi-phonon relaxation (MPR) and at room temperature only the lowest energy 4f125d1→4f13 and the 4f13→4f13 emission remains. For all compositions a 4f13→4f13 risetime phenomenon is then observed whose duration matches the 4f125d1→4f13 decay time. It shows the feeding of the 4f13 state after 4f125d1 excitation. Surprisingly, the feeding time becomes longer from Cl→Br→I, while the related 4f125d1-4f13 energy gap becomes smaller. The temperature dependence of the 4f125d1→4f13 and 4f13→4f13 emission intensity shows a anticorrelation as earlier observed in other systems and confirms that the feeding process is thermally stimulated. However, the thermally stimulated activation energies that control the feeding process, increase from Cl→Br→I despite our observation that the 4f125d1-4f13 energy gap becomes smaller. An analysis reveals that the unexpected behaviour in risetime and activation energy, as a function of composition, cannot be explained by 4f125d1→4f13 feeding via interband crossing, but more likely via MPR where the electron–phonon coupling strength decreases from Cl→Br→I. No strong relation was found between composition and the quantum efficiency (QE) of the 4f13→4f13 emission, due to the presence of fluctuations that are likely caused by intrinsic differences in sample quality. Nevertheless, a 4f13→4f13 QE of up to 70% has been observed and the materials can therefore be used in luminescence solar concentrators.RST/Luminescence MaterialsChemE/O&O groe
The synthesis of monodisperse alkanes with long chains
No full textThis thesis discusses reasons for the interest in monodisperse long chain alkanes and describes attempts, past and present, to synthesise such molecules. Chapter 1 discusses why the synthesis of such molecules are important and the objectives of this project. Chapter 2 reviews the methods previous groups have devised to prepare pure samples of long chain alkanes. In particular, work carried out by Whiting et al. at Bristol, whose scheme formed the basis of the early work in Durham. Chapter 3 describes the work in Durham and improvements which were made to Whiting's method, allowing the synthesis of longer chain lengths and greater quantities of materials to be achieved. Chapter 4 provides a summary of the practical work carried out by the author. Chapter 5 gives experimental details of the work described in Chapter 4
Targeted temperature management in emergency medicine: current perspectives
No full textBenton R Hunter,1 Timothy J Ellender1,2 1Department of Emergency Medicine, 2Department of Critical Care Medicine, Indiana University School of Medicine, Indiana University, Indianapolis, IN, USA Abstract: Landmark trials in 2002 showed that therapeutic hypothermia (TH) after out-of-hospital cardiac arrest due to ventricular tachycardia or ventricular fibrillation resulted in improved likelihood of good neurologic recovery compared to standard care without TH. Since that time, TH has been frequently instituted in a wide range of cardiac arrest patients regardless of initial heart rhythm. Recent evidence has evaluated how, when, and to what degree TH should be instituted in cardiac arrest victims. We outline early evidence, as well as recent trials, regarding the use of TH or targeted temperature management in these patients. We also provide evidence-based suggestions for the institution of targeted temperature management/TH in a variety of emergency medicine settings. Keywords: therapeutic hypothermia, cardiac arrest, heart arres
Peramalan Jumlah Pajak yang Diterima oleh Pemerintah Kabupaten Deli Serdang pada Tahun 2019-2020
No full textPeramalan adalah suatu kegiatan yang memperkirakan apa yang akan terjadi pada masa yang akan datang. Pajak mempunyai peranan yang sangat penting dalam kehidupan bernegara, khususnya didalam pelaksanaan pembangunan karena pajak merupakan sumber pendapatan Negara untuk membiayai semua pengeluaran termasuk pengeluaran pembangunan. Dalam penelitian ini akan membandingkan metode kuadrat terkecil, metode trend moment dan metode semi rata-rata untuk mengetahui jumlah pajak yang diterima oleh pemerintah kabupaten Deli Serdang Pada Tahun 2019-2020. Tujuannya adalah untuk mengetahui metode yang terbaik untuk meramalkan jumlah pajak di kabupaten Deli Serdang serta mengetahui keakuratan metode kuadrat terkecil, metode trend moment dan metode semi rata-rata dalam meramalkan jumlah pajak. Berdasarkan penelitian yang dilakukan oleh penulis, bila dibandingkan metode kuadrat terkecil, metode trend moment dan metode semi rata-rata dapat disimpulkan bahwa metode kuadrat terkecil lebih baik dibandingkan dengan metode trend moment dan metode semi rata-rata. Sehingga dengan menggunakan metode kuadrat terkecil, peramalan dapat dilakukan dengan sederhana dan menghasilkan output yang lebih akurat. Akurasi metode kuadrat terkecil untuk peramalan dengan nilai RMSE 22.125.394.311 dan MAPE 0,19% sangat baik jika dibandingkan dengan metode trend moment untuk peramalan dengan nilai RMSE 22.125.411.090 dan MAPE 0,28% dan metode semi rata-rata untuk peramalan dengan nilai RMSE 295.117.831.369 dan MAPE 47,04%.Forecasting is an activity that predicts what will happen in the future. Tax has a very important role in the life of the state, including in development because taxes are a source of state income to finance all expenses including development expenditure. In this study, we will compare the least squares method, trend moment method and semi-average method to find out the amount of tax received by Deli Serdang regency government in 2019-2020. The aim is to find out the best method for forecasting the amount of tax in Deli Serdang district and knowing the accuracy of the least squares method, the trend moment method and the semi-average method in forecasting tax amounts. Based on the research conducted by the author, when compared to the least squares method, the trend moment method and the semi-average method can be concluded that the least squares method is better than the trend moment method and the semi-average method. So that by using the least squares method, forecasting can be done simply and produce more accurate output. The accuracy of the least squares method for forecasting with the value of RMSE 22.125.394.311 and MAPE 0.19% is very good when compared with the trend moment method for forecasting with the value of RMSE 22.125.411.090 and MAPE 0.28% and the semi-average method for forecasting with values RMSE 295,117,831,369 and MAPE 47.04%.58 HalamanKertas Karya Diplom
Insights into the impacts of rural honey hunting in Zambia
No full textThis is the author accepted manuscript. The final version is available from Wiley via the DOI in this recordData Availability Statement: The data that support the findings of this study are available from the corresponding author upon reasonable request
BR 2 - Historisch metselwerk: Bouwstenen richtlijn voegmortels + testprotocollen (sept. 2012)
No full textHet in september 2012 afgeronde ‘Onderzoek Aanpak Vochtproblematiek zwaar regenbelast historisch metselwerk gemetseld in kalkmortels’, beoogde de kennisleemten op te vullen die bij een eerder verkennende onderzoek naar de ernstige vochtproblematiek bij bakstenen molenrompen (onderzoek 2000-2002), waren vastgesteld. Deze problemen bleken zich niet tot molens te beperken en zo werd de scoop verbreed tot al het zwaar regenbelaste historische massief metselwerk, voor zover gemetseld in kalkmortels (ca. 1300 – 1850), zoals kastelen en kasteelruïnes, kerktorens, molens, pakhuizen, stadspoorten etc. Het onderzoeksproject werd uitgevoerd door dr ir C.J.W.P.Groot en J.Gunneweg van de faculteit Civiele Techniek & Geowetenschappen van de TU Delft. Het ging van start in 2003, omvatte 11 deelonderzoeken, gefinancierd in 3 clusters en werd afgerond, september 2012. De resultaten zijn vastgelegd in de hierboven vermelde reeks onderzoeksrapporten, bouwstenen voor een richtlijn en de syllabus van een in 2007 gehouden studiedag. Ook zijn uit dit onderzoek voortgekomen een aantal artikelen in wetenschappelijke tijdschriften en populair wetenschappelijke artikelen in vakbladen. Ten slotte werden enkele artikelen van de hand van de onderzoekers gepubliceerd in het ‘Metselwerk-Boek’ dat verscheen tijdens het op 10 oktober 2012 door de Rijksdienst voor het Cultureel Erfgoed gehouden ‘Metselwerksymposium’. Belangrijke sponsoren van het onderzoeksproject waren, de (voorloper van de )Rijksdienst voor het Cultureel Erfgoed, het VSB-fonds, de provincie Zuid-Holland en KNB-Baksteen. De Federatie Monumentenwacht Nederland verleende organisatorische ondersteuning. OR Onderzoeksrapporten OR 1- Historisch metselwerk – Kwaliteitseisen restauratiebaksteen (mrt. 2007) OR 2- Historisch metselwerk – Kaliteitseisen metselmortels (mrt. 2007) OR 3- Historisch metselwerk - Restauratievoegmortels (sept. 2011) OR 4- Historisch metselwerk – Detectie & injectie (febr. 2011) OR 5- Historisch metselwerk – Uitvoering inboetwerk, transversaalscheuren, voegwerk (sept. 2012) OR 6- Historisch metselwerk – Bouwkundige detailleringen windmolens (febr. 2012) BR Bouwstenen voor de richtlijn BR 1- Historisch metselwerk – Bouwstenen richtlijn restauratiebaksteen metsel- mortels (apr. 2007) BR 2- Historisch metselwerk – Bouwstenen richtlijn voegmortels + testprotocollen (sept. 2012) BR 3- Historisch metselwerk – Bouwstenen richtlijn besteksteksten inboetwerk lateraalscheuren, herstel transversaalscheuren, voegwerkherstel (apr. 2012) SY SYLLABI SY 1- Historisch metselwerk – Syllabus studiedag aanpak vochtproblemen massief metselwerk – synthese wetenschap & vakmanschap, Delft 4 april 2007 (apr. 2007) VPM Vochtproblematiek Molens (verkennend onderzoek) VPM 1- Historisch metselwerk – Rapport Vochtproblematiek bakstenen windmolens (aug. 2002) VPM 2- Historisch metselwerk – Bijlagen Vochtproblematiek bakstenen windmolens (aug. 2002)Structural EngineeringCivil Engineering and Geoscience
GenImage
No full textYou can find an easy to use download script here:
https://www.unbiased-genimage.org
This is an easy to use download of the GenImage dataset for AI-generated image detection. We provide this download, since the original GenImage download at Baidu is hard to use from countries outside of Asia.
GenImage:
https://genimage-dataset.github.io/
The dataset corresponds to our paper "Fake or JPEG? Revealing Common Biases in Generated Image Detection Datasets"
https://www.unbiased-genimage.org
We added a metadata CSV which contains additional information to the original GenImage download, such as JPEG quality factor or content class ID.
We removed 17 corrupted files from the original download, as listed in corrupted_files.txt
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Who uses the fishery resources in South Africa’s largest impoundment? Characterising subsistence and recreational fishing sectors on Lake Gariep
No full textPAN15 Author Identification: Verification
No full text<p>We provide you with a training corpus that comprises a set of author verification problems in several languages/genres. Each problem consists of some (up to five) known documents by a single person and exactly one questioned document. All documents within a single problem instance will be in the same language. However, their genre and/or topic may differ significantly. The document lengths vary from a few hundred to a few thousand words.</p>
<p>The documents of each problem are located in a separate folder, the name of which (problem ID) encodes the language of the documents. The following list shows the available sub-corpora, including their language, type (cross-genre or cross-topic), code, and examples of problem IDs:</p>
<p>Language; Type; Code; Problem IDs<br>
Dutch; Cross-genre; DU; DU001, DU002, DU003, etc.<br>
English; Cross-topic; EN; EN001, EN002, EN003, etc.<br>
Greek; Cross-topic; GR; GR001, GR002, GR003, etc.<br>
Spanish; Cross-genre; SP; SP001, SP002, SP003, etc.</p>
<p>The ground truth data of the training corpus found in the file <code>truth.txt</code> include one line per problem with problem ID and the correct binary answer (Y means the known and the questioned documents are by the same author and N means the opposite). For example:</p>
<pre>EN001 N
EN002 Y
EN003 N
...</pre>
ROVIBRATIONAL SATELLITE BANDS OF THE Br SPIN-ORBIT TRANSITION IN Br DOPED SOLID PARAHYDROGEN
No full textAuthor Institution: Department of Chemistry, University of Wyoming, Laramie, WY 82071-3838In the isolated atom the Br spin-orbit (SO) transition is electric-dipole-forbidden because this transition (P \leftarrow P) does not involve a change in parity. The isolated Br SO transition therefore acquires intensity from magnetic-dipole and electric-quadrupole terms in the atom-field interaction Hamiltonian and this makes this transition inherently weak. Nonetheless, the Br SO transition is observed in Br-atom doped solid parahydrogen (pH) crystals prepared at liquid helium temperatures. It will be shown that the intensity of the Br SO transition is greater when isolated in solid pH due to weak intermolecular interactions of the Br atom with the pH matrix. The small increase in the Br SO transition strength results because the Br atom resides in a single substitution site of the hexagonal closed packed pH crystal which lacks a center of inversion. In addition, a vibrational satellite absorption is detected shifted to higher energy by one quantum of H vibration. This vibrational satellite absorption is stronger than the pure SO transition because simultaneous excitation of the Br SO and H vibrational excitation in the pair gives even greater electric-dipole character to the transition. IR spectral evidence for rotational, vibrational, and rovibrational satellite bands of the Br SO transition will be presented. The fact that the rotational and vibrational quantum states of the H molecule are conserved in solid pH accounts for why these satellite absorptions come at well-defined discrete frequencies. The frequencies and lineshapes of these satellite absorptions provide detailed information on the SO state dependent Br-H intermolecular potential
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