Digital Commons Network^™

Paper-Based Colorimetric Sensor For Mercury Ion Detection Using Smartphone Digital Imaging, Pakorn Preechaburana, Somsak Sangnuy, Supaluck Amloy

Journal of Metals, Materials and Minerals

In this research, we have developed a colorimetric paper-based sensing platform for the determination of mercury ion (Hg2+) using gold nanoparticles (AuNPs). To evaluate the selectivity in the response to a special target, urea is used as recognizing ligands on AuNPs for selective sensing Hg2+. Colorimetric readings in the presence of various environmentally relevant metal ions, such as Na+, K+, Zn2+, Pb2+, and Hg2+, were also studied. The results show that amongst all the tested metal ions, the SPR peaks are located at 525 nm except in the case of the present of Hg2+, in which is red shifted to …

Dielectric Properties And Electrochemical Behavior Of Graphene Oxide Derived From Myanmar Coal Minerals, Min Maung Maung, Chan Nyein Aung, Gasidit Panomsuwan, Khin Khin Win

Journal of Metals, Materials and Minerals

Graphene Oxide (GO) metal nanocomposites make up an emerging class of advanced materials and enhance material functionality to obtain multifunctional properties and working towards superior performance of energy storage devices. GO was derived from Myanmar coal minerals using Modified Hummer method. The silver and nickel nanoparticles were used as metal ions or metal nanoparticles to form GO nanocomposites. Their characteristics were identified by XRD, SEM and Raman Spectroscopy. The energy gap of GO and GO composites was also investigated by the aid of UV-Vis spectroscopy. The dielectric constant is measures of the amount of electrical energy that can be stored …

A Review On New Cobalt-Free Cathode Materials For Reversible Solid Oxide Fuel Cells, Sedat Akkurt, Can Sindiraç, Tuğçe Özmen Egesoy, Emre Erğen

Journal of Metals, Materials and Minerals

The exponential growth in the requirement of fuel cells and batteries leads to increased demand for cobalt due to its common use in high-performance Li-ion batteries and high-temperature fuel cells/electrolyzers. This sharp increment in demand raises concern about the availability of limited reserves of cobalt which can impact the price of cobalt. Moreover, the geographic limitations of cobalt resources may endanger the whole supply chain. In addition to all those, huge moral issues of cobalt mining are also another problem. Hence, leading battery, fuel cells and electrolyzer manufacturers are looking for sustainable alternatives to reduce cobalt dependency. A more specific …

High-Temperature Oxidation Resistance Of Craln Thin Films Prepared By Dc Reactive Magnetron Sputtering, Nirun Witit-Anun, Adisorn Buranawong

Journal of Metals, Materials and Minerals

CrAlN thin films were prepared by using the reactive DC unbalanced magnetron sputtering method from the single alloy target on a silicon substrate. The effect of annealing temperature in the air which ranges from 500℃ to 900℃ for 1 h on phase structure, film composition, surface morphology, microstructure, and hardness was investigated by XRD, EDS, FE-SEM, and Nanoindentation techniques, respectively. The high-temperature (up to 900℃) oxidation resistance of the thin film was also evaluated. The result shows that solid solutions of (Cr,Al)N with (111), (200), and (220) planes for the as-deposited film and no oxide phase were found after annealing …

Effect Of Annealing Temperature On The Tio Anodized Films Properties For Dental Implant Application, Phanawan Whangdee, Wittawat Saenrang, Nampueng Pangpaiboon, Pristanuch Masakul, Dujreutai Pongkao Kashima

Journal of Metals, Materials and Minerals

The TiO2 anodized films generated at low current density after annealing are good candidates for surface coating, as a hydrophilicity is a crucial characteristic that determines dental implant applications. In this study, the hydrophilicity of TiO2 anodized films annealed at various temperatures was examined. It was found that increasing the annealing temperature during the anodization procedure improves the hydrophilicity of the TiO2 anodized films. This is related to the evolution of the TiO2 anodized film structure produced by raising the annealing temperature, which converts the TiO2 anodized amorphous phase to rutile phases. Moreover, increased annealing temperature results in more oxygen …

Structure And Properties Of The Contact Wire Obtained By Ecap With Forming, Denis Alekseevich Aksenov, Rashid Nailevich Asfandiyarov, Georgy Iosifovich Raab, Yulia Ramilevna Sementeeva

Journal of Metals, Materials and Minerals

This paper presents the results of the development of a promising method for manufacturing contact wires for high-speed railways. The developed method is based on the principles of severe plastic deformation and the combination of metal-forming processes. The solution obtained is a combination of equal-channel angular pressing with the forming of a shaped contact wire with a cross-sectional area of 120 mm2 in one tooling. A feature of the work is that with the help of a comprehensive study by the methods of finite element computer modeling and a physical experiment, not only the stress-strain state of the deformation zone …

Multipurpose Fluorescent Carbon Dots From Papaya Seed Waste As Sensing Materials For Cu2+ Detection And Diethyl Ether Vapor Sensor Via Electronic Nose System, Nichaphat Thongsai, Aphinya Chuiduang, Sumana Kladsomboon, Insik In, Peerasak Paoprasert

Journal of Metals, Materials and Minerals

Herein, carbon dots (CDs) as biocompatible, fluorescent carbon-based nanomaterials were synthesized from papaya seed waste as renewable carbon sources for the first time via a facile acid pyrolysis method. The papaya seed-derived CDs showed blue fluorescence emission under UV light (365 nm) with a quantum yield of 2.74%, and contained oxygen-, and nitrogen- containing functional groups. Due to their surface functionality, the CDs have a great potential for using as fluorescence sensing probe in metal ion sensing application. The CD solution exhibited the most selective detection to Cu2+ as presented the highest fluorescence quenching with the limit of detection (LOD) …

Synthesis And Characterization Of Electron Beam Irradiated Glutinous Rice Husk-Derived Biochar And Activated Carbon For Aqueous Electrochemical Capacitors, Kittapas Kitsanadecha, Charlita Sinmak, Patchanan Onchomchan, Kanit Hantanasirisakul, Tanagorn Kwamman, Suranan Anantachaisilp

Journal of Metals, Materials and Minerals

Glutinous rice husk, an abundant agricultural biowaste in Thailand, was pretreated with high energy electron beam irradiation (EBI) at doses of 500 kGy, 1000 kGy, and 1500 kGy prior to fabrication into biochar by carbonization at 500℃ under nitrogen atmosphere. The biochar was then treated with KOH and subsequently heated at 800℃, yielding activated carbon (GAC). The physical, chemical, and electrochemical properties of the as-received biochar (GB) and activated carbon (GAC) were investigated. Scanning electron microscopic images (SEM) suggested that biochar irradiated with 1500 kGy (GB-1500) has the highest porosity compared to the other samples. The electrochemical properties of GB …

Polyol Method And Surface Functionalization Of Silver Nanowires Using Bovine Serum Albumin For Surface-Enhanced Raman Scattering Application, Khoa Tien Cao, Khoi Khac Tran, Hue Thi Do

Journal of Metals, Materials and Minerals

Silver nanowires (AgNWs) with diverse applications are attracting the attention of many researchers around the world. In this study, we applied the polyol method to synthesize AgNWs based on Polyvinyl-pyrrolidone (PVP) average molecular weight of 360,000, ethylene glycol (EG), and AgNO3 precursor with a fresh AgCl preparation. To synthesize this material we first investigate optimal parameters through the influence of reaction temperature, time of creating AgNWs using plasmon absorption spectroscopy, and scanning electron microscope (SEM) images. The obtained AgNWs are high efficiency, large aspect ratio, and good dispersion in the solution. This sample continues to be conducted to surface functionalization …

Dispersion Mechanism Of Nanoparticles And Its Role On Mechanical, Thermal And Electrical Properties Of Epoxy Nanocomposites - A Review, Baljit Singh, Akash Mohanty, Amit Kumar Srivastava, Ajay Singh

Journal of Metals, Materials and Minerals

The combined effect of nano-reinforcements on the mechanical performance of nanocomposites, which are a novel class of epoxy matrix hybrid nanocomposites containing multiwall carbon nanotubes (MWCNT), graphene, and nanodiamonds (NDs), is drawing substantial attention from many research communities. The discussion concentrates on the dispersion techniques adopted for the preparation of epoxy composites containing different types of nanoparticles (3-D fillers, nanofibers, nanotubes, and plate-like fillers). This review paper covers the electrical, thermal, and mechanical properties of carbon nanotubes (CNTs), graphene, and nanodiamond-reinforced epoxy nanocomposites and correlates them with the topographical features, morphology, weight fraction, dispersion state, and surface functionalization of CNTs, …

Fabrication Of Granular Foam Glass Aggregates From Soda Lime Silicate Glass Waste, Pat Sooksaen, Phumin Prakaisri, Pattraporn Teerapatpanid, Pathompong Puathawee

Journal of Metals, Materials and Minerals

Granular foam glass aggregates were fabricated from a soda lime silicate glass waste which utilized crude glycerol as a foaming agent and sodium silicate as a binder. The granulation and the foaming process were carried out by a granulator and an electric rotary furnace. The study investigated at first the foaming behavior of different foam glass formulations at various sintering temperatures. Three compositions were formulated which utilized glass powder at 85 wt%, 90 wt%, and 95 wt%, respectively. Sintering was carried out at temperatures from 800℃ to 1200℃ to evaluate for the foaming and melting characteristics. Foam glass with 90% …

Study Of Corrosion Properties Of Carbon Steel, 304 And 316l Stainless Steels In Sulfuric Acid And Their Degradation Products, Eakapoj Khamme, Rachsak Sakdanuphab

Journal of Metals, Materials and Minerals

In this study, corrosion properties of carbon steel and stainless steels, and degradation of sulfuric acid by the corrosion mechanism are presented. Carbon steel (CS), 304 stainless steel (SS304), and 316L stainless steel (SS316L) specimens were analyzed through their electrochemical response by using a potentiostat measurement. The specimens were submerged in concentrated 98 wt.% of H2SO4 acid for 0 day to 60 day. The degradation of H2SO4 was determined by its volume change, turbidity, and color due to the corrosion mechanism. Corrosion rate of CS, SS304 and SS316L specimens are 43.237 mm/year, 0.420 mm/year and 0.086 mm/year, respectively. After 60 …

Microstructure And Mechanical Properties Of 0.2c-3.9al-1.12mn-0.3mo Δ-Trip Steel As A Function Of Isothermal Bainitic Transformation Temperature, Mahsa Gholambargani, Yahya Palizdar, Ali Khanlakhani, Ali Khanlakhani

Journal of Metals, Materials and Minerals

The present investigation employed a two-stage heat treatment on a δ-transformation-induced plasticity (TRIP) steel comprising 0.2C–4Al–1.2Mn–0.3Mo (wt%). The mechanical and microstructural characteristics that result from varied isothermal bainitic transformation (IBT) temperatures following inter-critical annealing at 820℃ for 10 min are thoroughly analyzed. The microstructure of the steels consisted of δ-ferrite, α-ferrite, bainitic ferrite, retained austenite (RA), and martensite, resulting in an optimum combination of the ultimate tensile strength (UTS) and total elongation (TE). The results of the investigation showed that IBT temperature had an effect on the stability of RA and the martensitic transition. Due to the increased mechanical stability …

Improvement Of Specific Capacity Of Lithium Iron Phosphate Battery By Increasing The Surface Area And Electrical Conductivity Of Cathode Electrode Using Graphene Foam, Phurida Kokmat, Patiphat Matsayamat, Kunaree Wongrach, Piyaporn Surinlert, Akkawat Ruammaitree

Journal of Metals, Materials and Minerals

Lithium iron phosphate (LFP) is widely used as an active material in a cathode electrode for lithium-ion batteries (LIBs). LFP has many remarkable properties such as high working voltage and excellent thermal stability. However, it suffers with slow ion diffusion and low electrical conductivity. Graphene foam has many outstanding properties such as large surface area and great electrical conductivity. These properties are suitable for improving the cathode electrode. In this work, the graphene foam was synthesized by chemical vapor deposition. The cathode electrode was prepared by dropping the LFP on the graphene foam. We found that the specific capacity of …

Synthesis Of Carbon Nanowalls By Oxy-Acetylene Torch Method, Bauyrzhan Zhumadilov, Aidar Kenzhegulov, Renata Nemkayeva, Gulmira Partizan, Yerassyl Yerlanuly, Maratbek Gadbullin

Journal of Metals, Materials and Minerals

This work presents a relatively new method for the synthesis of carbon nanowalls (CNWs) based on oxy-acetylene torch as a function of deposition time. The morphological and structural properties of the obtained CNW films were studied by scanning electron microscopy and Raman spectroscopy. Changes in the morphology and structural properties of the CNW films depending on the synthesis time were revealed. Shorter growth times lead to the formation of thinner CNW films with a dense labyrinth-like structure, while longer growth times lead to thicker CNW films with a petal-like structure. In addition, this study opens up the possibility of synthesizing …

Sustainable Innovation In Ballistic Vest Design: Exploration Of Polyurethane-Coated Hemp Fabrics And Reinforced Sandwich Epoxy Composites Against 9 Mm And .40 S&W Bullets, Tannachart Wantang, Manop Pipathattakul, Fasai Wiwatwongwana

Journal of Metals, Materials and Minerals

This research aimed to evaluate the bulletproof capabilities of hemp fabrics and optimize the design factors for effective ballistic vests. Three main aspects were investigated: enhancing toughness with polyurethane-coated hemp fabrics, determining optimal placement of fabric-reinforced hemp epoxy composites in various configurations, and identifying the optimal number of fabric layers for performance against 9 mm and .40 S&W bullets. Penetration depth was measured in ballistic gelatin to analyze the results. The study showed strong statistical correlations between factor variables and penetration depth shifts. The most effective strategies included polyurethane-coated hemp on all layers and increased layering. The ammunition of 9 …

Structural And Electrical Properties Of 0.98(Ko0.5na0.5onboo3)-0.02(Bio0.5nao0.5tioo3) Ceramics, Swayam Aryam Behera, Sugato Hajra, Swati Panda, Ali Amanat, P. G. R. Achary

Journal of Metals, Materials and Minerals

In the present communication, lead-free ceramics having composition 0.98(K0.5Na0.5NbO3)-0.02(Bi0.5Na0.5TiO3) were synthesized by a high-temperature solid-state reaction route. The Rietveld refinement for the 0.98KNN-0.02BNT reveals an MPB with phase fraction Amm2 (87.76 %) and Pm-3m (12.27%). The SEM study predicted a mean diameter of 0.98KNN-0.02BNT grains as 0.52µm±0.19. The 0.98KNN-0.02BNTceramic displayed a typical hysteresis loop with a remnant polarisation(Pr) of 7.0 μC/cm2, saturation polarization (Ps) of 16 μC/cm2, and a coercive field (Ec) of 26 kV/mm. The electrical, Raman spectra, dielectric, and hysteresis loop study supported a morphotropic phase boundary. The synthesized KNN-BNT lead-free material can be an excellent material for …

Aku Libraries Annual Report - 2023, Office Of The University Librarian

Office of the University Librarian Reports

- Message by Peter Gatiti Associate Vice Provost & University Librarian

- AKU Author’s Day – 2023

- Glimpses of Author’s Day Celebrations

- FAS Library - Welcomes Inaugural Class

- Library Systems

- Collaborations and Partnerships

- Librarian Emeritus

- Library Staff Achievements

- Librarians Get Faculty Status

- Teaching and Learning Commons

- University Archives

- Little is Right Without Copyright

- eScriptorium is the New Way to Encode

- Book Review

- AKU Librarian’s Publications

Third-Party Verification Immunization Coverage Survey (Tpvics) - 2023, Sajid Bashir Soofi, Imtiaz Hussain, Muhammad Ahmed Kazi, Ahmad Khan, Muhammad Umer, Khalid Feroz, Imran Ahmed, Dale A. Rhoda, Zulfiqar Ahmed Bhutta

The Aga Khan University Survey Reports

• Background
• Survey Design and Methodology
• Implementation of Survey
• Survey Results
• References

I Owe My Teaching Career To Peter Henning, David A. Moran

Articles

In the late 1990s, I was very happily working as an appellate public defender in Detroit when the then-dean of Wayne State University Law School, Jim Robinson, contacted me to ask if I could teach a section of Criminal Procedure at night. Joe Grano, who had taught at Wayne for many years, had fallen ill, and so a replacement was needed. Dean Robinson was a close friend of Ralph Guy, the judge for whom I had clerked some years earlier, and Judge Guy had recommended me. I accepted the offer.

Even though I was just a lowly adjunct scheduled to …

Feedback Loops: E-D-I-T (Continued), Patrick Barry

Articles

In the "Feedback Loops" column back in March, we introduced the "E-D-I-T" framework:

• Find something to Eliminate
• Find something to Decrease
• Find something to Increase
• Find something to Try

This new column will discuss each category more in depth.

Dethroning Langdell, Beth H. Wilensky

Articles

I come not to bury the case method. I come merely to dethrone it. While the case method’s monopolistic hold on the law school classroom has loosened somewhat in recent years, it is still the dominant approach to pedagogy in many law school classrooms—and especially in the first-year law student experience. That is also true of the case method’s traditional pedagogical partners, the Socratic method and the cold call: their dominance has declined somewhat, even while they still have remarkable staying power.

This Essay identifies one fault with our continued acquiescence to these pedagogical mainstays of law school classrooms: it …

The Utpr And The Credits, Reuven S. Avi-Yonah

Articles

Critics of the UTPR (formerly known as the undertaxed payments rule) of the G-20/0ECD/ inclusive framework base erosion and profit shifting project's pillar 2 have focused on the potential impact of the top- up tax on U.S. environmental credits enacted in the Inflation Reduction Act(IRA, P.L.11 7-169) and on credits to encourage domestic chip manufacturing in the Creating Helpful Incentives to Produce Semiconductors and Science Act (the CHIPS Act, P .L. 117-167). They argue that Congress's ability to effectively implement its chosen policy goals is undermined because the UTPR - when applied to other parts of U.S. multinational enterprises - …

Pillar 2 And The Credits., Reuven S. Avi-Yonah

Articles

The international tax provisions of the Build Back Better Act (BBB) passed by the House of Representatives represent a reasonable compromise. They are consistent with the OECD’s Pillar Two statement, and they represent a significant move toward the implementation of the single tax principle (STP). In what follows, we will discuss the proposed changes and how they fit in with the new international tax regime (ITR). We will also address the possible interactions with the ITR if BBB is not enacted.

The Misattuned Music Industry: An Intersubjective Perspective On The Music Industry's Mental Health Crisis, Jonathan Fricke

Graduate School of Professional Psychology: Doctoral Papers and Masters Projects

Research shows that professional musicians tend to experience higher rates of mental health challenges compared to the general population. While there are a number of underlying factors and historical experiences that may help us to better understand these psychological struggles, I will be examining the relational system between musician and the music industry beginning at the time in which an amateur musician transitions to the professional realm. With this transition comes incredible demand and pressure from the industry. Professional musicians are at the mercy of grueling tour schedules where they spend months away from loved ones, must be "on" at …

Weplay Denver: The Why And How: Background And Implementation Manual, Lauren Gross

Graduate School of Professional Psychology: Doctoral Papers and Masters Projects

WePlay Denver (WePlay and Nosotros Jugamos; see glossary) is a program providing caregiver-infant playgroups designed to teach families with young children the value of play as well as provide information and resources on topics related to child development, family wellbeing, and mental health. WePlay and Nosotros Jugamos are a collaboration between the University of Denver’s Graduate School of Professional Psychology (GSPP) and the Children’s Museum of Denver, Marsico Campus, and are based on a similar program from the Chicago Children’s Museum. WePlay offered its first playgroup in 2019, while Nosotros Jugamos began in 2020.

Perinatal Through 5-Years-Old Referral List, And Full Referral Flow Process For The Professional Psychology Clinic And Associated Clinics, Lauren V. Cruz

Graduate School of Professional Psychology: Doctoral Papers and Masters Projects

Referrals are an important and underacknowledged component of ethical clinical practice. While clinical care is understandably the core focus for most organizations, effective and efficient referrals can aide in improving client outcomes through successful connections to services, effective use of conjunctive services, and increased trust in mental health and healthcare systems/providers. In addition, improvements in the referral process can serve to decrease undue burden on providers and organizations. This document aims to review the literature on the need for and use of referrals, as well as elements of successful referrals, to inform the development of a referral self-assessment and flow …

Affirming Care: Lessons From Minority Stress Model To Bolster Mental Health Outcomes For Lgbtq+ Youth In Primary Care, Kyrie Lampert

Graduate School of Professional Psychology: Doctoral Papers and Masters Projects

Individuals in positions of power influence youth wellbeing, self-perception, and overall mental health. According to the minority stress model, individuals who hold marginalized identities, such as LGBTQ+ youth, face unique, chronic, and socially based additive stressors. Research shows that these additive stressors contribute to LGBTQ+ youth experiencing disproportionate rates of mental health concerns. Queer youth are more than four times as likely to attempt suicide than their non-queer identifying peers. Additive stressors that LGBTQ+ youth face include prejudiced events, stigma, decisions of concealment or disclosure, and internalized homophobia and transphobia. This paper will review and integrate research, utilizing the minority …

Paternal Perinatal Psychopathology And Stigma Related To Nicu Admission, Hudson Holland Jones

Graduate School of Professional Psychology: Doctoral Papers and Masters Projects

Stigma or the belief that mental health difficulties stem from a personal weakness, moral failing, or poor choices and will subject one to shame, embarrassment, scrutiny, victimization, oppression, and ostracization is a reason people choose to avoid, not to obtain or fully engage in mental health treatments despite their demonstrated effectiveness (Corrigan, 2004;Vogel et al., 2006). Gender differences have been found in experiences of stigma; for example, men were found to self-stigmatize to justify avoiding counseling to a greater degree than women (Judd et al., 2008). As such, stigma has been identified as a gender-salient variable that serves as a …

Cognitive Assessment Of Latinx/E Bilinguals In The United States: A Fictitious Case Study, Vanessa Magro

Graduate School of Professional Psychology: Doctoral Papers and Masters Projects

Despite a growing body of literature and best-practice guidelines and considerations, assessment providers working with Latinx/e populations are left with numerous questions about how to translate these ideas into practice. This paper is meant to begin to answer some of these questions for Spanish-speaking providers administering cognitive tests to bilingual Latinx/e clients in the United States. The basis for these answers is a comprehensive literature review and my experience providing culturally-responsive assessment services to a bilingual Latinx/e population in the United States. A fictitious case study is included so that providers can get a concrete idea of how to bring …