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Articles 291871 - 291900 of 715359

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Improving The Electrochemical Properties Of Polyaniline By Doping With Silver Ions, Hui Xu, Jin-Juan Pu, Yong Chen, Jian Liu Feb 2016

Improving The Electrochemical Properties Of Polyaniline By Doping With Silver Ions, Hui Xu, Jin-Juan Pu, Yong Chen, Jian Liu

Journal of Electrochemistry

Polyaniline (PANI) is an attractive candidate among the various conductive polymers based on its unique doping/de-doping behavior, intrinsic electrical conductivity, facile synthesis, and environmental stability. However, the poor conductivity and cycle stability in an acid medium have restricted its applications. Our work aims at solving the above problems effectively by doping silver ions into PANI. The PANI and PANI doped with silver ions (PANI/Ag+) were synthesized by a facile interfacial polymerization process, which used aniline as a starting material in toluene in contact with an aqueous solution of silver nitrate varied from 0.04 mol•L-1 to 0.20 mol⋅L …

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Admissions Report - Detailed Data - February 2016, Office Of Institutional Research & Effectiveness, Wright State University Feb 2016

Admissions Report - Detailed Data - February 2016, Office Of Institutional Research & Effectiveness, Wright State University

Admissions Reports

Detailed report of applicants to Wright State including data on county of residency, intended major, and ethnicity for Fall Semester 2015.

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Adsorption Behavior Of Rhodamine 6g On Silver Surfaces Studied By Electrochemical Surface-Enhanced Raman Spectroscopy, Chan-Juan Chen, Cheng Zong, Guo-Kun Liu, Bin Ren Feb 2016

Adsorption Behavior Of Rhodamine 6g On Silver Surfaces Studied By Electrochemical Surface-Enhanced Raman Spectroscopy, Chan-Juan Chen, Cheng Zong, Guo-Kun Liu, Bin Ren

Journal of Electrochemistry

Rhodamine 6G (R6G) is one of the most common probe molecules employed in single molecule surface-enhanced Raman spectroscopy (SM-SERS). The study in adsorption behavior of R6G will help understand the interactions between R6G and surface. In this paper, we used electrochemical surface-enhanced Raman spectroscopy (SERS) to study the potential-dependent adsorption behavior of R6G on silver electrodes. Our results show that when the potential moved negatively, the orientation of R6G on silver surface changed from vertical to inclined adsorption. This result indicates that the abnormal SM-SERS spectra of R6G observed in the former SM-SERS studies from other research groups are due …

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Electrochemical Detection Of Hydrogen Peroxide At Aunps Modified Electrode Using P-Hydroxyphenylboronic Acid As A Precursor, Chun-Yan Wang, Xiao-Qiu Liu, Ying-Xin Qi Feb 2016

Electrochemical Detection Of Hydrogen Peroxide At Aunps Modified Electrode Using P-Hydroxyphenylboronic Acid As A Precursor, Chun-Yan Wang, Xiao-Qiu Liu, Ying-Xin Qi

Journal of Electrochemistry

We developed a new method for electrochemical detection of hydrogen peroxide (H2O2) based on boronate oxidation of p-hydroxyphenylboronic acid. This method using p-aminophenol which is produced from the reaction of H2O2 and p-aminophenylboronic acid as a well electrochemical probe, combined with a gold nanoparticles (AuNPs) modified electrode for an indirect detection of H2O2. Because of the large surface area and enhanced electrocatalytic behavior by the AuNPs modified electrode, the detection sensitivity was improved. The method could detect H2O2 in the concentration range of 1 ~ 100 …

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Electrochemical Determination Of Hg(Ii) At Gold Nanoparticles@Carbonaceous Microspheres Modified Electrode, Tian-Yu Qiu, Ming-Chun Wang, Xian-Feng Du, Tian-Jia Jiang, Xing-Jiu Huang Feb 2016

Electrochemical Determination Of Hg(Ii) At Gold Nanoparticles@Carbonaceous Microspheres Modified Electrode, Tian-Yu Qiu, Ming-Chun Wang, Xian-Feng Du, Tian-Jia Jiang, Xing-Jiu Huang

Journal of Electrochemistry

The gold nanoparticles@carbonaceous microspheres (Au@CMSs) and  Au@CMSs modified glassy carbon electrode (GCE) were prepared. The Au@CMSs modified  GCE was further examined for possible sensitive detection of mercury ions (Hg(II)) in an aqueous solution by square wave anodic stripping voltammetry (SWASV). The excellent performance was found in the stripping analysis of Hg(II) in 0.1 mol•L-1 NaAc-HAc(pH=5.0) with a sensitivity of 25.863 A•(mol•L-1)-1 and a detection limit of 3.69×10-8 mol•L-1 based on the 3σ method.

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Fabrication Of Riboflavin Electrochemical Sensor Based On Au Nanoparticles/Polydopamine/Carbon Nanotubes Modified Glassy Carbon Electrode, Hua-Ping Peng, Mei-Ling Yu, Xin Liu, Pan Liu, Wei Chen, Ai-Lin Liu, Xin-Hua Lin Feb 2016

Fabrication Of Riboflavin Electrochemical Sensor Based On Au Nanoparticles/Polydopamine/Carbon Nanotubes Modified Glassy Carbon Electrode, Hua-Ping Peng, Mei-Ling Yu, Xin Liu, Pan Liu, Wei Chen, Ai-Lin Liu, Xin-Hua Lin

Journal of Electrochemistry

A novel electrochemical platform for the high sensitivity detection of riboflavin was constructed by Au nanoparticles/polydopamine/carbon nanotubes (Au-PDA-MWCNTs) nanocomposite modified glassy carbon electrode. The Au-PDA-MWCNTs nanocomposite was synthesized by in situ reduction method. The characteristics of the as-prepared Au-PDA-MWCNTs nanocomposite modified electrodes were investigated by using UV-Vis spectroscopy, scanning electron microscopy (SEM) and electrochemical methods. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to study the electrochemical behavior of riboflavin (RF) at Au-PDA-MWCNTs nanocomposite modified electrodes. The results demonstrated that the present electrochemical sensor exhibited a wide linear range from 5×10-9 mol•L-1to 1×10-5 mol•L …

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Synthesis Of Fe, N-Doped Graphene/Carbon Black Composite With High Catalytic Activity For Oxygen Reduction Reaction, Chi Chen, Zhi-You Zhou, Xin-Sheng Zhang, Shi-Gang Sun Feb 2016

Synthesis Of Fe, N-Doped Graphene/Carbon Black Composite With High Catalytic Activity For Oxygen Reduction Reaction, Chi Chen, Zhi-You Zhou, Xin-Sheng Zhang, Shi-Gang Sun

Journal of Electrochemistry

Oxygen reduction reaction (ORR) is a bottleneck for improving the efficiency of proton-exchange membrane fuel cells as a cathode reaction due to its sluggish kinetics. The exploitation of low cost and high performance non-precious metal catalysts such as Fe/N/C based materials toward ORR has attracted extensive attentions. In this work, the Fe, N-doped graphene nanosheets/carbon black composite was prepared by hydrothermal polymerization and followed by a twice-heat-treatment procedure using 2-aminoimidazole as an N precursor, FeCl3 as an Fe precursor and KJ600 carbon black as a support. The TEM images revealed that the graphene nanosheets were separated by carbon black …

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Electrochemical Syntheses Of Graphene And Its Composites, Bo Zhao, Li Jiang, Ming-Hui Yuen, Xian-Zhu Fu, Rong Sun, Ching-Ping Wong Feb 2016

Electrochemical Syntheses Of Graphene And Its Composites, Bo Zhao, Li Jiang, Ming-Hui Yuen, Xian-Zhu Fu, Rong Sun, Ching-Ping Wong

Journal of Electrochemistry

Graphene is a kind of ideal two-dimensional flat carbon nanomaterials which have unique chemical and physical properties. The attractive potential applications must be based on the high quality mass production of graphene. However, it remains a huge challenge. An electrochemical approach is a fast, environmental friendly and easy-operating method. single- or multi-layered graphene flakes can easily be produced in short periods of time. In this review, the structure, properties and preparation methods of graphene are first introduced. Accordingly, the electrochemical approaches used for the productions of graphene flakes, graphene/inorganic nanocomposites, graphene/polymer composites and graphene analogues are highlighted. Finally, challenges and …

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An Electrochemical Investigation Of P-Sulfophenylazo Calix[4]Arene In A Buffer Solution, Xing Yang, Ping Chen Feb 2016

An Electrochemical Investigation Of P-Sulfophenylazo Calix[4]Arene In A Buffer Solution, Xing Yang, Ping Chen

Journal of Electrochemistry

The p-sulfophenylazo calix[4]arene was synthesized through the diazotization-coupling reaction between calix[4]arene and p-aminobenzene sulfonic acid. The UV-Vis spectroscopy, Infrared spectroscopy, and nuclear magnetic resonance (NMR) were used to characterize the as-prepared p-sulfophenylazo calix[4]arene. The electrochemical behaviors of p-sulfophenylazo calix[4]arene were investigated by cyclic voltammetry and chronoamperometry using CH3COOH-CH3COONa as a buffer solution. The result shows that the p-sulfophenylazo calix[4]arene exhibited a pair of redox peaks in a scan potential region of -0.5 ~ 1 V. The oxidation and reduction peak potentials were 0.302 V and -0.003 V, respectively, and changed with the scanning rates. In addition, …

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Temperature Effects On Properties Of Aerospace Nickel Hydrogen Cells, Hai-Chang Zhang, Yu-Qi Diao, Wen-Cheng Ming, Xue-Ying Ren, Fei Ding Feb 2016

Temperature Effects On Properties Of Aerospace Nickel Hydrogen Cells, Hai-Chang Zhang, Yu-Qi Diao, Wen-Cheng Ming, Xue-Ying Ren, Fei Ding

Journal of Electrochemistry

This has been done using the 60 Ah nickel-hydrogen cell to investigate the temperature effects on properties of aerospace nickel hydrogen cells. The charge-discharge, trickle charge, overcharge, self-discharge and cycle life tests were carried out at different temperatures. The results show that the discharge capacity and overcharge rate were increased first, and then decreased with the raising temperature. On the other hand, the trickle charge value and the 3 days self-discharge rate were raised with increasing temperature. When the temperature was -5 oC, the discharge capacity of cell reached the maximum discharge capacity of 63.68 Ah. Based on the …

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Effect Of Flame Retardant On Electrochemical Performances Of Lithium Ion Battery With Lini0.4Co0.2Mn0.4O2 As A Positive Electrode Material, Yan-Zhuo Lv, Yong-Xian Ge, Zhen-Bo Wang, Ke Ke Feb 2016

Effect Of Flame Retardant On Electrochemical Performances Of Lithium Ion Battery With Lini0.4Co0.2Mn0.4O2 As A Positive Electrode Material, Yan-Zhuo Lv, Yong-Xian Ge, Zhen-Bo Wang, Ke Ke

Journal of Electrochemistry

The effect of flame retardant on the electrochemical performances of lithium ion battery by using LiNi0.4Co0.2Mn0.4O2 as a positive material was studied by measuring the first charge-discharge, cycling, circulation, and AC impedance curves. The experimental data indicated that the discharge capacity of the battery decreased, while the charge transfer resistance and the lithium ion diffusion resistance increased with the increases in the concentrations of the flame retardant in the electrolyte solutions. Furthermore, the stability of the battery at small discharge ratios and the cyclic performance were also improved by the addition of flame …

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Electricity Generation Of Microbial Fuel Cell Using Stainless Steel Mesh As Cathode, Hong-Yan Dai, Hui-Min Yang, Xian Liu, Xuan Jian, Xiu-Li Song, Zhen-Hai Liang Feb 2016

Electricity Generation Of Microbial Fuel Cell Using Stainless Steel Mesh As Cathode, Hong-Yan Dai, Hui-Min Yang, Xian Liu, Xuan Jian, Xiu-Li Song, Zhen-Hai Liang

Journal of Electrochemistry

In the present work, a dual-chamber microbial fuel cell (MFC) was constructed with aeration tank sludge as an inoculum, carbon felt as an anode and stainless steel mesh without any modification as a cathode. The influence of the cathode size was investigated in terms of voltage output, power generation and electrochemical impedance. The long-term durability of the stainless steel mesh cathode was also evaluated. Results showed that the stainless steel mesh exhibited satisfactory long-term durability as MFC cathode. When the stainless steel mesh size was 2 × 2 cm2, the maximum output voltage, power density, the internal resistance …

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The Study On Comparison Of Electrochemical Performance In Microbial Fuel Cell With Glucose And Sodium Acetate Acting As Substrates, Lei Fan, Yu Zhao, Ting Li, Qin-Bo Yuan, En-Zhi Wang, Xiao-Bin Wang, Jun-Wen Wang Feb 2016

The Study On Comparison Of Electrochemical Performance In Microbial Fuel Cell With Glucose And Sodium Acetate Acting As Substrates, Lei Fan, Yu Zhao, Ting Li, Qin-Bo Yuan, En-Zhi Wang, Xiao-Bin Wang, Jun-Wen Wang

Journal of Electrochemistry

By inoculating aerobic sludge and anaerobic sludge from the sewage treatment plant, two sets of dual-chamber microbial fuel cells (MFCs) were built with either glucose or sodium acetate acting as a substrate. Accordingly, the electrochemical performances of MFCs were explored with the concentration of the substrates being 0.0335 mol⋅L-1. The results of the comparative study in glucose system and sodium acetate system showed that the impedance values of anodic half cell were 222 Ω for glucose and 213.67 Ω for sodium acetate, implying no significant effect on the internal resistance in battery with the different substrates. The exchange …

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Sublimation Drying Coefficient And Expand Study Of Sublimation Forecasting Model During Freezing Drying Of Cooked Beef Slice, Kong Lingyuan, Li Yalei, Luo Ruiming Feb 2016

Sublimation Drying Coefficient And Expand Study Of Sublimation Forecasting Model During Freezing Drying Of Cooked Beef Slice, Kong Lingyuan, Li Yalei, Luo Ruiming

Food and Machinery

The relationship are discussed, between the sublimation drying coefficient and the mode of pre freezing, pre-freezing temperature, material thickness, heating temperature, pressure of drying chamber. Tests were performed using single factor test method. The sublimation drying coefficient of materials was measured with different thickness and pressure under heating temperature 80 ℃, using slow pre-freezing method in the temperature -30 ℃ on the premise that free water sublimation entirely. The results were fitting by software Origin 9.0 and established sublimation drying coefficient query database using VB language. Therefore, the sublimation drying coefficient database of cooked beef slice was set up on …

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Defragmenting Struktur Berpikir Siswa Dalam Menyelesaikan Masalah Pertidaksamaan Eksponen, Fitri Kumalasari, Toto Nusantara, Cholis Sa’Dijah Feb 2016

Defragmenting Struktur Berpikir Siswa Dalam Menyelesaikan Masalah Pertidaksamaan Eksponen, Fitri Kumalasari, Toto Nusantara, Cholis Sa’Dijah

Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan

The aim of this study is to describe the thinking structure students’ error related to solve inequality exponent problem and the effort of defragmenting. The subject of this study is student of X class SMAN 6 Malang which learned this material. The subject choose considered procedural error and their communication skill. The thinking structure students’ error found from think out loud result in a process to solve inequality exponent problem. The obtained data will code and be based to describe defragmenting process. The founding of this study is the thinking structure students’ error such as misgeneralization, misidentification, overspecialization, and repair …

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Pengaruh Model Problem Based Learning Berbasis Outdoor Study Terhadap Hasil Belajar Siswa Kelas Xi Iis Sma, Galuh Maulidiyahwarti, Sumarmi Sumarmi, Achmad Amirudin Feb 2016

Pengaruh Model Problem Based Learning Berbasis Outdoor Study Terhadap Hasil Belajar Siswa Kelas Xi Iis Sma, Galuh Maulidiyahwarti, Sumarmi Sumarmi, Achmad Amirudin

Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan

The purpose of this study is to find out the effect of Problem Based Learning with Outdoor Study to learning outcome on grade XI IIS. This research is quasi experiment in SMA Negeri 1 Lawang, Malang with XI IS 5 as experiment class and XI IS 2 as control class. The result of this research shows that Problem Based Learning with Outdoor Study influences learning outcome with significance rate 0,031 by independent sample t-test on SPSS 17.0 for Windows.

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Analisis Lembar Kerja Siswa Dalam Meningkatkan Komunikasi Matematis Tulis Siswa, Fimmatur Rizka Ardina, Cholis Sa’Dijah Feb 2016

Analisis Lembar Kerja Siswa Dalam Meningkatkan Komunikasi Matematis Tulis Siswa, Fimmatur Rizka Ardina, Cholis Sa’Dijah

Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan

Communication is the important thing for each human life. Communication help people to understand about what the others say. Beside that communication also make someone to know idea of others. Communication is away to learn how to rearrange word so they can understand about our mind. Communication in this field focuses on written communication. The aim of this article is to describe analysis process of worksheet as atool to increase written communication skill in mathematics. The kind of research is qualitatative research. The analysis worksheet use standard communication (NCTM, 2000), that are (1) students write idea clearly, (2) students write …

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Pengembangan Lks Bercirikan Guided Discovery Learning Pada Materi Segi Empat Untuk Siswa Kelas Vii Mts, Ismatul Maula, Subanji Subanji, Sudirman Sudirman Feb 2016

Pengembangan Lks Bercirikan Guided Discovery Learning Pada Materi Segi Empat Untuk Siswa Kelas Vii Mts, Ismatul Maula, Subanji Subanji, Sudirman Sudirman

Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan

The objective of the study is to the produce students’ worksheet using the Guided Discovery Learning it is valid, practical and effective. This is a research and developmental design which adopted the model of Plomp. This developmental model includes phases preliminary research, prototyping phase and assessment phase. The subject of this study is the students of class VII MTs Labbaika Samarinda. The result of the study shows that the LKS is in the category of valid with mean 3,40. The result of the try-out show that it fulfills the practicality aspect which is useful and achieves the category of high …

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Beban Kognitif Siswa Dalam Pembelajaran Materi Geometri, Barep Yohanes, Subanji Subanji, Sisworo Sisworo Feb 2016

Beban Kognitif Siswa Dalam Pembelajaran Materi Geometri, Barep Yohanes, Subanji Subanji, Sisworo Sisworo

Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan

The purpose of the study describes the rises of cognitive load of students in learning geometry. The study used a qualitative approach. The results showed that the intrinsic cognitive load is derived from the number of elements of interactivity of position, distance, and angles between points, lines, and areas, congruency of triangles, algebraic and fractional operations. Intrinsic cognitive load comes from the complexity of the learning material that constitutes visualizing, performing algebraic operations, determining congruency triangle, and the angle of difficulties. Extraneous cognitive load that arise due to the way the teacher in explaining too fast and disturbance of some …

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Pengaruh Pembelajaran Kooperatif Stad Terhadap Retensi Siswa Kelas V Sekolah Dasar, Yudha Adrian, I Nyoman Sudana Degeng, Sugeng Utaya Feb 2016

Pengaruh Pembelajaran Kooperatif Stad Terhadap Retensi Siswa Kelas V Sekolah Dasar, Yudha Adrian, I Nyoman Sudana Degeng, Sugeng Utaya

Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan

The objective of study was to find out the effect of cooperative learning STAD on students’ retention of fifth grade in Social Studies in SDN Kelayan Barat 3 Banjarmasin. This study is quasi experiment using nonequivalent control group design. The subjek of study were 42 fifth grade students. Instrument was used multiple choices test in 20 items. T test independent using software IBM SPSS 21 was used to analysis data. Findings this study showed that cooperative learning STAD give effect to fifth grade students’ retention in Social Studies. Suggestion for teachers to impelement cooperative learning type STAD is by carefully …

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Proses Berpikir Siswa Smp Bergaya Kognitif Field Dependent Dalam Menyelesaikan Masalah Berdasarkan Teori Pemrosesan Informasi, Syifa’Ul Amamah, Cholis Sa’Dijah, Sudirman Sudirman Feb 2016

Proses Berpikir Siswa Smp Bergaya Kognitif Field Dependent Dalam Menyelesaikan Masalah Berdasarkan Teori Pemrosesan Informasi, Syifa’Ul Amamah, Cholis Sa’Dijah, Sudirman Sudirman

Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan

The objective of this study is to describe the thinking process of junior high school students with field dependence cognitive style in solving problems rectangles and triangles based on the theory of information processing. This study used a qualitative approach. This research was conducted in one of SMP city of Malang. Subjects of this study consisted of two students with field dependence cognitive style. To achieve the purpose of the study, researcher gave tests of mathematics and conducted interviews to the subjects of the research. The result of the study showed that field dependence students have not a good memory …

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Dampak Program Resitasi Terhadap Perubahan Konseptual Mahasiswa Pada Topik Hukum Iii Newton, Ida Bagus Rini Jayanti, Wartono Wartono, Sutopo Sutopo Feb 2016

Dampak Program Resitasi Terhadap Perubahan Konseptual Mahasiswa Pada Topik Hukum Iii Newton, Ida Bagus Rini Jayanti, Wartono Wartono, Sutopo Sutopo

Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan

Through this research the computer-assisted recitation program has been developed which is consisted of 9 multiple choice of conceptual questions and its feedback. This research purposed to investigate the effect of the recitation program to students’ conceptual understanding and conceptual change about Newton third laws. Data retrieved with a pretes using multiple choice who given after kinematics learning (one and two-dimensional) and particle dynamics (Newton’s laws of force and motion) and a postes was given after using the recitation program. The program used as offline by the student for a week. Subject of this study consisted of 35 students of …

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Meningkatkan Kemampuan Berpikir Kreatif Matematis Siswa Sma Melalui Pembelajaran Open Ended Pada Materi Spldv, Firdaus Firdaus, Abdur Rahman As’Ari, Abd. Qohar Feb 2016

Meningkatkan Kemampuan Berpikir Kreatif Matematis Siswa Sma Melalui Pembelajaran Open Ended Pada Materi Spldv, Firdaus Firdaus, Abdur Rahman As’Ari, Abd. Qohar

Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan

This research is aims to describe mathematical creative thinking ability of senior high school students through open ended problem learning in Linier Equation System of Two Variables (LESTV). This reasearch type is descriptive kualitative. Subject of this research are tenth grade students of SMAN 1 WAJA DOMPU. The learning steps of this research are: 1) orientation, 2) inform the material, 3) offering and solving the Open Ended problems, 4) presentation of discussion result, 5) conclution. This research result is that students have ability to creative thinking mathematically.

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Gesture Menunjuk Dan Representasional Siswa Sesuai Dengan Tahapan Berpikir Van Hiele, Tiwi Nur Masita, Edy Bambang Irawan, Sisworo Sisworo Feb 2016

Gesture Menunjuk Dan Representasional Siswa Sesuai Dengan Tahapan Berpikir Van Hiele, Tiwi Nur Masita, Edy Bambang Irawan, Sisworo Sisworo

Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan

The objective of this study is to describe gesture of pointing and gesture representational which appropriate to the level of thinking of van Hiele. This study used a qualitative approach which is included into descriptive exploratory study. The subjects of this study are 6 students of 8th graders of SMP Negeri 3 Balikpapan. The selected subjects of this study consisted of two students with the level of understanding 0 (recognition), 2 students with the level of understanding 1 (analysis), and 2 students with the level of understanding 2 (order). The gestures were observed when students solved the problems in groups. …

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Large-Amplitude Mesospheric Response To An Orographic Wave Generated Over The Southern Ocean Auckland Islands (50.7°S) During The Deepwave Project, Pierre-Dominique Pautet, Michael J. Taylor, D. C. Fritts, K. Bossert, B. P. Williams, D. Broutman, J. Ma, S. D. Eckermann, J. D. Doyle Feb 2016

Large-Amplitude Mesospheric Response To An Orographic Wave Generated Over The Southern Ocean Auckland Islands (50.7°S) During The Deepwave Project, Pierre-Dominique Pautet, Michael J. Taylor, D. C. Fritts, K. Bossert, B. P. Williams, D. Broutman, J. Ma, S. D. Eckermann, J. D. Doyle

All Physics Faculty Publications

The Deep Propagating Gravity Wave Experiment (DEEPWAVE) project was conducted over New Zealand and the surrounding regions during June and July 2014, to more fully understand the generation, propagation, and effects of atmospheric gravity waves. A large suite of instruments collected data from the ground to the upper atmosphere (~100 km), with several new remote-sensing instruments operating on board the NSF Gulfstream V (GV) research aircraft, which was the central measurement platform of the project. On 14 July, during one of the research flights (research flight 23), a spectacular event was observed as the GV flew in the lee of …

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Situative Creativity: Larger Physical Spaces Facilitate Thinking Of Novel Uses For Everyday Objects, Joel Chan, Timothy J. Nokes-Malach Feb 2016

Situative Creativity: Larger Physical Spaces Facilitate Thinking Of Novel Uses For Everyday Objects, Joel Chan, Timothy J. Nokes-Malach

The Journal of Problem Solving

People often use spatial metaphors (e.g., think “laterally,” “outside the box”) to describe exploration of the problem space during creative problem solving. In this paper, we probe the potential cognitive underpinnings of these spatial metaphors. Drawing on theories of situative cognition, semantic foraging theory, and environmental psychology, we formulate and test the hypothesis that larger physical spaces can facilitate divergent (but not convergent) processes in problem space exploration. Across two experiments, participants worked on a battery of problem solving tasks intended to represent divergent (alternative uses, shape invention) and convergent (remote associates, letter extrapolation) problem solving processes in either a …

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Um Opens Search For Vice Chancellor For Diversity And Community Engagement, Staff Report Feb 2016

Um Opens Search For Vice Chancellor For Diversity And Community Engagement, Staff Report

University of Mississippi News

Committee established to find qualified candidate

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Some Supercongruences Occurring In Truncated Hypergeometric Series, Ling Long, Ravi Ramakrishna Feb 2016

Some Supercongruences Occurring In Truncated Hypergeometric Series, Ling Long, Ravi Ramakrishna

Faculty Publications

For the purposes of this paper supercongruences are congruences between terminating hypergeometric series and quotients of p-adic Gamma functions that are stronger than those one can expect to prove using commutative formal group laws. We prove a number of such supercongruences by using classical hypergeometric transformation formulae. These formulae, most of which are decades or centuries old, allow us to write the terminating series as the ratio of products of Γ-values. At this point sums have become quotients. Writing these Γ-quotients as Γp-quotients, we are in a situation that is well-suited for proving p-adic congruences. These Γp-functions can be p-adically …

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Null Spaces Of Radon Transforms, Ricardo Estrada, Boris Rubin Feb 2016

Null Spaces Of Radon Transforms, Ricardo Estrada, Boris Rubin

Faculty Publications

We obtain new descriptions of the null spaces of several projectively equivalent transforms in integral geometry. The paper deals with the hyperplane Radon transform, the totally geodesic transforms on the sphere and the hyperbolic space, the spherical slice transform, and the Cormack-Quinto spherical mean transform for spheres through the origin. The consideration extends to the corresponding dual transforms and the relevant exterior/interior modifications. The method relies on new results for the Gegenbauer-Chebyshev fractional integrals.

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How Much Should You Pay For A Financial Derivative?, Boyan Kostadinov Feb 2016

How Much Should You Pay For A Financial Derivative?, Boyan Kostadinov

Publications and Research

We explain some key mathematical ideas behind the no-arbitrage pricing of financial derivatives by replication, starting from a simple coin toss model and ending with the continuous-time limit of a multi-step coin-toss model using a geometric random walk model. In the limit, we obtain the classical Black-Scholes-Merton formula for pricing European call and put options.

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