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- Journal of the Minnesota Academy of Science (16)
- Al-Azhar Bulletin of Science (3)
- Undergraduate Review (3)
- DePaul Discoveries (2)
- Journal of Science Education for Students with Disabilities (2)
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- The Cardinal Edge (2)
- Bulletin of Chinese Academy of Sciences (Chinese Version) (1)
- DU Undergraduate Research Journal Archive (1)
- Journal of Undergraduate Research (1)
- Journal of the South Carolina Academy of Science (1)
- KSU Distinguished Course Repository (1)
- Mako: NSU Undergraduate Student Journal (1)
- PANDION: The Osprey Journal of Research and Ideas (1)
- SMU Data Science Review (1)
- The Graduate Review (1)
Articles 1 - 30 of 37
Full-Text Articles in Physical Sciences and Mathematics
Differentiation Of Human, Dog, And Cat Hair Fibers Using Dart Tofms And Machine Learning, Laura Ahumada, Erin R. Mcclure-Price, Chad Kwong, Edgard O. Espinoza, John Santerre
Differentiation Of Human, Dog, And Cat Hair Fibers Using Dart Tofms And Machine Learning, Laura Ahumada, Erin R. Mcclure-Price, Chad Kwong, Edgard O. Espinoza, John Santerre
SMU Data Science Review
Hair is found in over 90% of crime scenes and has long been analyzed as trace evidence. However, recent reviews of traditional hair fiber analysis techniques, primarily morphological examination, have cast doubt on its reliability. To address these concerns, this study employed machine learning algorithms, specifically Linear Discriminant Analysis (LDA) and Random Forest, on Direct Analysis in Real Time time-of-flight mass spectra collected from human, cat, and dog hair samples. The objective was to develop a chemistry- and statistics-based classification method for unbiased taxonomic identification of hair. The results of the study showed that LDA and Random Forest were highly …
Phosphorus And Its Role In Chemical Evolution, Asbel Gonzalez
Phosphorus And Its Role In Chemical Evolution, Asbel Gonzalez
PANDION: The Osprey Journal of Research and Ideas
Phosphorus is a minor element with a cosmic abundance of about 105.5 atoms per 1012 H atoms (Boudreaux, n.d.). Phosphorus was depleted as a volatile throughout the developing solar system, and as a result, volatile forms of phosphorus would have been minimal, even in the colder regions of the solar nebula. Despite its low abundance, phosphorus minerals play key roles in planetary petrology, including through the formation of phosphate minerals that trapped volatiles and rare Earth elements, and in the formation of metal phosphides that may have served as nucleation sites for kamacite and taenite crystal growth in minor planet …
Exploring Students’ Epistemological Understanding Of Atomic Structure Models, Claire V. Ward, Morgan Balabanoff
Exploring Students’ Epistemological Understanding Of Atomic Structure Models, Claire V. Ward, Morgan Balabanoff
The Cardinal Edge
Developing a robust understanding of atomic structure and the nature of matter is foundational across chemistry and STEM courses. The development of this concept is challenging because it relies on models to illustrate something not directly observable. Scientific models are important tools used to explain phenomena, particularly phenomena that are not directly observable. In general chemistry, students are typically asked to consider four different models: (1) the particle model, (2) the nuclear model, (3) the Bohr model, and (4) the Quantum model. Each depiction has its own advantages and limitations, where instructors introduce each model to explain specific parts of …
Exploring Retrieval Difficulties And Self-Confidence In An Assessment Of General Chemistry Students, Karen Julian, Morgan Balabanoff
Exploring Retrieval Difficulties And Self-Confidence In An Assessment Of General Chemistry Students, Karen Julian, Morgan Balabanoff
The Cardinal Edge
Developing self-assessment skills is an important aspect of learning. Framed by assessment developed for the year-long sequence of general chemistry, students were asked to rate their ability to answer conceptual questions. Using cognitive interviews, this study revealed that people rely on a range of characteristics other than content knowledge to assess their confidence, including doubt, retrieval difficulty, and test-taking methods. These findings imply that more explicit instruction may be required to encourage correct self-assessment. Students can develop their metacognitive skills and calibrate their perceived ability by completing examinations meant to emphasize content knowledge gaps.
Principles Of Chemistry-1, Rajnish Singh
Principles Of Chemistry-1, Rajnish Singh
KSU Distinguished Course Repository
Principles of Chemistry, chem 1211, is a 3 credit hour course, the first in a two-semester sequence covering the fundamental principles and applications of chemistry for science majors. Course content includes electronic structure of atoms and molecules, bonding fundamentals, fundamentals of chemical reactions, and gas laws. The course is taught asynchronously and the final exam being a national exam offered by the American chemical society, (ACS), that has to be taken in person.
Geothermal Energy And Its Impacts On The Environment, Aditi Gorthy, Nathan Tran, Laureen Pierre-Louis
Geothermal Energy And Its Impacts On The Environment, Aditi Gorthy, Nathan Tran, Laureen Pierre-Louis
Mako: NSU Undergraduate Student Journal
From the multitude of energy sources that we have developed throughout the eons, renewable energy or “clean energy” has been on the rise to combat global warming and climate change which burning nonrenewable sources of energy have contributed to. Before geothermal energy is used as part of the mainstream energy sources some aspects must be analyzed and resolved. Unfortunately, geothermal power plants still release pollutants, such as carbon dioxide and sulfur dioxide, into the environment and cause general environmental disruptions due to drilling and changes in land formations. Recent and future studies have been and should be conducted to find …
Synthesis Of New Ligand-Based Phosphazo Ring And Its Transition Metal Complexes As Cancer Inhibitor: Spectroscopic, Dft, Antimicrobial, And Molecular Docking Investigations, Asmaa A. Hamed, Ahmed A. El-Sherif, Carmen M. Sharaby, Yousry A. Ammar, Mona F. Amine
Synthesis Of New Ligand-Based Phosphazo Ring And Its Transition Metal Complexes As Cancer Inhibitor: Spectroscopic, Dft, Antimicrobial, And Molecular Docking Investigations, Asmaa A. Hamed, Ahmed A. El-Sherif, Carmen M. Sharaby, Yousry A. Ammar, Mona F. Amine
Al-Azhar Bulletin of Science
A condensation between 2-sulfanilamidopyrimidine and a p-toluidine dimer of cyclodiazadiphosphetidine resulted in the formation of a new ligand, 2,2,4,4-tetrachloro-1,3-di-[p-tolyl]-2,4-di-[N-(pyrimidin-2-yl) benzenesulfonamide]-1,3,2,4-diazadiphosphetidine, (H2L). We investigated the chemical behavior of the newly prepared ligand was investigated by treating it with some chosen metal ions at a stoichiometric ratio of 1:2 (L:M), where M = Fe(III), Fe(II), Cu(II), Zn(II), Cd(II), and Ag(I), to provide colored complexes with accepted yields. Then, we characterized the ligand and related complexes using spectroscopic and analytical techniques. Investigations revealed that the geometrical structure of the complexes was octahedral, except for the silver complex was tetrahedral. From the spectral analyses, …
Novel Technique In Production Of Pb (Ii)- Imprinted Polymers, Ehab Mohammed, Mostafa M. Elsheikh, Adham A. El-Zomrawy, Farag A. Ahmed
Novel Technique In Production Of Pb (Ii)- Imprinted Polymers, Ehab Mohammed, Mostafa M. Elsheikh, Adham A. El-Zomrawy, Farag A. Ahmed
Al-Azhar Bulletin of Science
Ion imprinting techniques were used to produce ion imprinted polymer (IIP) particles for the selective removal of Pb2+ from aqueous environments. As the Templating monomers, acrylic acid, acrylic amine ligand, and Methylene Bisacrylamide crosslinker were chosen. The imprinted polymer was prepared by free radical polymerization. By leaching with 0.1 M HCl, the (Pb2+) ion was removed from the template. The polymer particles were characterized by IR spectroscopy, Thermal analysis and potentiometric analysis. The produced polymer was mechanically crushed into fine particles, assembled into a sensor probe, and linked to a bare HB graphite pencil electrode (GPE). The sensor has a …
Enhanced Adsorption Of Anionic Dyes Using Sr-Doped Zno Nanoparticles: Nonlinear Kinetics And Isotherm Studies, Mostafa H. Mohamed, Taha M. Elmorsi, H. M. Abdelbary
Enhanced Adsorption Of Anionic Dyes Using Sr-Doped Zno Nanoparticles: Nonlinear Kinetics And Isotherm Studies, Mostafa H. Mohamed, Taha M. Elmorsi, H. M. Abdelbary
Al-Azhar Bulletin of Science
Using a co-precipitation process, sr-doped ZnO was prepared and demonstrated to be effective in the removal of anionic congo red dye, since its surface positive charge was increased to 17.3 mV. To investigate the surface morphology and physicochemical characteristics of Sr-doped ZnO, FTIR spectroscopy, scanning electron microscopy (SEM), elemental analysis, and point of zero charges (pHPZC) were employed. We conducted batch adsorption experiments to investigate the effects of contact time (180 minutes), pH (3.5–11), adsorbent dosage (0.5–3.0 g L−1), and temperature (288–328 K). The kinetic study was modeled using several equations, including pseudo-firstorder (PFO), pseudo-second-order (PSO), Elovich, and intra-particle diffusion …
Dr. Lawrence J. Berliner, Anit Tyagi
Dr. Lawrence J. Berliner, Anit Tyagi
DU Undergraduate Research Journal Archive
An interview with Dr. Lawrence J. Berliner.
Strategic Consideration And Recommendation On Development Of Chemistry In China, Yanlin Cheng, Shuxian Wu, Qing Dai, Chunying Chen, Yuliang Zhao
Strategic Consideration And Recommendation On Development Of Chemistry In China, Yanlin Cheng, Shuxian Wu, Qing Dai, Chunying Chen, Yuliang Zhao
Bulletin of Chinese Academy of Sciences (Chinese Version)
Chemistry, as a central science linking all the other sciences, has played an influential role in promoting the development of the whole scientific and technological field and the prosperity of economy and society. Developed countries strongly support the development of chemistry and effectively promote the level of chemical research and chemical industry. Since the founding of the People's Republic of China, chemical research has been supported among the field of natural sciences, and its current level is at the forefront of the world. However, there are still problems in the field of chemistry research in China, such as insufficient major …
Correlation Effects On Intramolecular C-H...Oh And O-H...O Hydrogen Bond Interactions In Azelaic Acid: An Ab Initio Study, Sabina Kalata, Alina Huang, Ruben Parra
Correlation Effects On Intramolecular C-H...Oh And O-H...O Hydrogen Bond Interactions In Azelaic Acid: An Ab Initio Study, Sabina Kalata, Alina Huang, Ruben Parra
DePaul Discoveries
Electron correlation effects on both conventional, O-H…O, and nonconventional, C-H…O, intramolecular hydrogen bonds present in a selected azelaic acid folded conformation were evaluated ab initio using HF and MP2 methodologies. The relative strength of the hydrogen bonds was examined through different indicators derived from geometry, vibrational frequencies, and electron density along the hydrogen bond path. The HF method results in weaker O-H…O and C-H…O hydrogen bonds when compared with the corresponding results using the MP2 method. Additionally, the stability of the folded azelaic conformation is found to depend on the level of theory used. Accordingly, the zero-point corrected energies of …
Visualization Without Vision – How Blind And Visually Impaired Students And Researchers Engage With Molecular Structures, Croix J. Laconsay, Henry B. Wedler, Dean J. Tantillo
Visualization Without Vision – How Blind And Visually Impaired Students And Researchers Engage With Molecular Structures, Croix J. Laconsay, Henry B. Wedler, Dean J. Tantillo
Journal of Science Education for Students with Disabilities
This article examines the tools and techniques currently available that enable blind and visually impaired (BVI) individuals to visualize three-dimensional objects used in learning chemistry concepts. How BVI individuals engage with and visualize molecular structure is discussed and recent tactile (or haptic) and auditory methods for visualization of various chemistry concepts are summarized. Remaining challenges for chemistry education researchers are described with the aim of highlighting the potential value of educational research in further enabling BVI students to pursue careers in science, technology, engineering, and mathematics (STEM) fields.
New Innovation In The Flipped Chemistry Classroom
New Innovation In The Flipped Chemistry Classroom
The Graduate Review
No abstract provided.
Serendipitous Discovery Of A New Method For The Catalytic Synthesis Of Indole-Fused Benzazepanes, Edward Gluzman, Paul A. Vadola
Serendipitous Discovery Of A New Method For The Catalytic Synthesis Of Indole-Fused Benzazepanes, Edward Gluzman, Paul A. Vadola
DePaul Discoveries
We report here on our investigations into the application of 1,5-hydride transfer cyclization mechanisms to the synthesis of 2,3-disubstituted benzofurans and indoles. We found that PtI4 in MeCN at 120 ºC was indeed capable of activating the alkyne, however, the expected 2,3-disubstituted indole product was not observed. Instead we isolated an indolyl-3-benzazepane via an unexpected intramolecular Steven’s rearrangement/ring expansion. While this transformation has been previously reported our method may prove to have increased substrate scope and more practical reaction conditions. Further studies are underway to optimize the reaction conditions and to fully explore the scope and mechanism of the …
Ambiguity In Speaking Chemistry And Other Stem Content: Educational Implications, Mick D. Isaacson, Michelle Michaels
Ambiguity In Speaking Chemistry And Other Stem Content: Educational Implications, Mick D. Isaacson, Michelle Michaels
Journal of Science Education for Students with Disabilities
Ambiguity in speech is a possible barrier to the acquisition of knowledge for students who have print disabilities (such as blindness, visual impairments, and some specific learning disabilities) and rely on auditory input for learning. Chemistry appears to have considerable potential for being spoken ambiguously and may be a barrier to accessing knowledge and to learning. Educators in chemistry may be unaware of, or have limited awareness of, potential ambiguity in speaking chemistry and may speak chemistry ambiguously to their students. One purpose of this paper is to increase awareness of potential ambiguity in speaking chemistry and other STEM fields …
Learning Chemistry Through Experimentation, Brent Kamba `, Dr. Jennifer Nielson
Learning Chemistry Through Experimentation, Brent Kamba `, Dr. Jennifer Nielson
Journal of Undergraduate Research
There is a great need for students to learn scientific skills in Uganda. Very few students pass the national chemistry exams (about 40%) and even fewer go on to study science fields in higher education. The teaching methods in Uganda are a little bit old fashion where students often just learn facts and practise rote memorization. Rarely do they develop the critical and analytical skills to help them succeed in science jobs. Teachers also express that the curriculum is very theoretical, and not experimental.
Surge Of Green: A Sustainable Approach To Conductive Polymers, Bethany Masten
Surge Of Green: A Sustainable Approach To Conductive Polymers, Bethany Masten
Undergraduate Review
No abstract provided.
Hydromination Of Alkynes, Enynes, And Dienes Using Titanium Catalysts, Taryn Palluccio
Hydromination Of Alkynes, Enynes, And Dienes Using Titanium Catalysts, Taryn Palluccio
Undergraduate Review
No abstract provided.
Development Of Dirhodium Sugar-Substituted Carboxylate And Acetamide Complexes And Evaluation Of Their Potential As Lectin Inhibitors, Bethany Masten
Development Of Dirhodium Sugar-Substituted Carboxylate And Acetamide Complexes And Evaluation Of Their Potential As Lectin Inhibitors, Bethany Masten
Undergraduate Review
No abstract provided.
Using Microenvironmental Effects To Increase Loading And Stereoselectivity For Polymer Bound Nabh4 Reagents., James R. Blanton
Using Microenvironmental Effects To Increase Loading And Stereoselectivity For Polymer Bound Nabh4 Reagents., James R. Blanton
Journal of the South Carolina Academy of Science
No abstract provided.
The Development Of A General Education College Chemistry Course, Luther Arnold
The Development Of A General Education College Chemistry Course, Luther Arnold
Journal of the Minnesota Academy of Science
No abstract provided.
Semi-Micro Procedure In High School Laboratories, Karl J. Aaberg
Semi-Micro Procedure In High School Laboratories, Karl J. Aaberg
Journal of the Minnesota Academy of Science
No abstract provided.
Chemical Magic Experiments, Leonard A. Ford
Chemical Magic Experiments, Leonard A. Ford
Journal of the Minnesota Academy of Science
No abstract provided.
The Inductive Compared With The Deductive Approach To Teaching Secondary School Chemistry, Clarence H. Boeck
The Inductive Compared With The Deductive Approach To Teaching Secondary School Chemistry, Clarence H. Boeck
Journal of the Minnesota Academy of Science
No abstract provided.
Chemistry-Restricted, Robert Molkenbur
Chemistry-Restricted, Robert Molkenbur
Journal of the Minnesota Academy of Science
No abstract provided.
Two Physical Methods For The Quantitative Determination Of One Component Of A Mixture Of Gases, Marvin M.D. Williams, Hugh O. Brown, William B. Dublin, Walter M. Boothby
Two Physical Methods For The Quantitative Determination Of One Component Of A Mixture Of Gases, Marvin M.D. Williams, Hugh O. Brown, William B. Dublin, Walter M. Boothby
Journal of the Minnesota Academy of Science
No abstract provided.
Chemistry Demonstrations In Public, Leonard A. Ford
Chemistry Demonstrations In Public, Leonard A. Ford
Journal of the Minnesota Academy of Science
No abstract provided.
Applications Of Artificial Radioactivity To Problems In Chemistry, D. E. Hull
Applications Of Artificial Radioactivity To Problems In Chemistry, D. E. Hull
Journal of the Minnesota Academy of Science
No abstract provided.
The Biological Use Of The Stable Mass Isotopes, Allan Hemingway
The Biological Use Of The Stable Mass Isotopes, Allan Hemingway
Journal of the Minnesota Academy of Science
No abstract provided.