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Articles 271 - 300 of 291361

Full-Text Articles in Physical Sciences and Mathematics

Calculation Of Alpha-Decay Half-Lives Using A Numerical Approach, Daniel Suescún-Díaz, Rosemberg Gómez-Noguera, Diego Rasero-Causil Oct 2026

Calculation Of Alpha-Decay Half-Lives Using A Numerical Approach, Daniel Suescún-Díaz, Rosemberg Gómez-Noguera, Diego Rasero-Causil

Karbala International Journal of Modern Science

This study introduces a numerical approach for estimating alpha-decay half-lives of alpha-emitting nuclei using a modified five-parameter Woods-Saxon potential. The radial Schrödinger equation is solved with the Numerov method to calculate the wave function and the barrier transmission probability, without relying exclusively on the WKB approximation. The calculations were performed for 398 nuclides taken from the NUBASE2020 database. Of these, 264 nuclides were used for the MWS5 parameter-adjustment stage, whereas the remaining 134 nuclides were reserved for an independent evaluation of the model. The results were compared with those obtained from two reference models: the modified Gamow-Like Model (MGLM) and …

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Antioxidant, Anti-Tyrosinase, Anti-Elastase, And Anti-Collagenase Activities Of Propolis Extracts From The Stingless Bee Tetragonula Laeviceps (Smith, 1857), Tri Hadi Handayani, Dimas Andrianto, Sih Kahono, Pamungkas Rizki Ferdian, Raden Lia Rahadian Amalia, Muhamad Ridwan Oct 2026

Antioxidant, Anti-Tyrosinase, Anti-Elastase, And Anti-Collagenase Activities Of Propolis Extracts From The Stingless Bee Tetragonula Laeviceps (Smith, 1857), Tri Hadi Handayani, Dimas Andrianto, Sih Kahono, Pamungkas Rizki Ferdian, Raden Lia Rahadian Amalia, Muhamad Ridwan

Karbala International Journal of Modern Science

Stingless bees incorporate propolis into their nest as a structural and protective material. Information remains limited on how solvent fractionation affects the antioxidant and enzyme-inhibitory activities of propolis produced by Indo nesian Tetragonula laeviceps. This study examined a crude extract prepared with 70% ethanol together with the n- hexane, ethyl acetate, and water fractions obtained from it. The analysis comprised total phenolic content (TPC), total flavonoid content (TFC), three antioxidant assays (ABTS, CUPRAC, TBARS), and inhibition of tyrosinase, elastase, and collagenase. The largest TPC and TFC values were obtained from the ethyl acetate fraction, at 85.93 ± 1.28 mg GAE/g …

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Xenoliths In Meteorites: Insights Into The Dynamics Of Material Exchange Between Asteroids, J. Gattacceca, B. Devouard, L. Bonal, Y. Marrocchi, A. Greshake, R. Tartese, M. Gounelle, D. Auyang, C. Sonzogni, M. Hutson, Multiple Additional Authors Oct 2026

Xenoliths In Meteorites: Insights Into The Dynamics Of Material Exchange Between Asteroids, J. Gattacceca, B. Devouard, L. Bonal, Y. Marrocchi, A. Greshake, R. Tartese, M. Gounelle, D. Auyang, C. Sonzogni, M. Hutson, Multiple Additional Authors

School of Earth, Environment, and Society Faculty Publications and Presentations

A minor fraction of meteorites contains xenoliths, that is, clasts that were formed on a different parent body than that of the host lithology. The occurrence of xenoliths is direct evidence for the exchange of material between asteroids, including exchanges between asteroids from the carbonaceous (CC) and non-carbonaceous (NC) reservoirs. Overall xenolith population statistics may therefore inform us about the dynamical mixing of these two asteroid reservoirs. Xenoliths are also intrinsically interesting because they may sample parent bodies that are not represented in the meteorite collection. In this work, we conducted a critical and exhaustive review of xenoliths described in …

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A Biased Variant Of The Ladybug Clock Problem, Jacob Vogelpohl, Russell May Oct 2026

A Biased Variant Of The Ladybug Clock Problem, Jacob Vogelpohl, Russell May

Communications on Number Theory and Combinatorial Theory

Instead of the common assumption of uniform probabilities for steps in a random walk on a graph, we generalize the steps to be biased and compute several statistics related to biased random walks on a cycle graph, more fancifully known as the ``ladybug clock problem." We obtain new explicit formulas for the distribution of probabilities for a walk to end on a particular node, the expected cover time for the cycle, and other similar statistics. We carry out these computations solely with generating functions related to the classic gambler's ruin problem.

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Innovative Development Of Synthetic Biology Industry From Perspective Of Deep Integration Of Four Chains, Qin Guo, Chao Zhang Oct 2026

Innovative Development Of Synthetic Biology Industry From Perspective Of Deep Integration Of Four Chains, Qin Guo, Chao Zhang

Bulletin of Chinese Academy of Sciences (Chinese Version)

Future industries represent the development direction of technological innovation and emerging industries, and are the main path to accelerate the formation of new quality productivity. As an important subsector of the future industry, synthetic biology industry is becoming a new track and new format for new quality productivity, and various regions are making cutting-edge directions such as synthetic biology industry a hot topic for future industrial layout. Based on the analysis of typical cities such as Shenzhen, Beijing, Tianjin, Shanghai, Hangzhou, and Changzhou, the current integration of the Four Chains in the synthetic biology industry is facing a four-dimensional dilemma …

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Ai-Driven Drug Innovation Research: Trends, Challenges, And Countermeasures, Tian Miao, Qi Zhou, Lianzheng Zhou, Weijun Xu, Siyuan Liu Oct 2026

Ai-Driven Drug Innovation Research: Trends, Challenges, And Countermeasures, Tian Miao, Qi Zhou, Lianzheng Zhou, Weijun Xu, Siyuan Liu

Bulletin of Chinese Academy of Sciences (Chinese Version)

Artificial intelligence (AI) is profoundly transforming the innovation paradigm, industrial ecosystem, and business model of drug research and development. In recent years, the global AI-driven pharmaceutical market has grown rapidly. Major economies, multinational pharmaceutical enterprises, and technology giants are accelerating their strategic deployment. AI pharmaceutical industry has entered a critical stage of transitioning from proof-of-concept to commercial-application. China attaches great importance to the integrated development of AI and the biopharmaceutical industry, but it still faces challenges, including data scarcity, talent shortages, algorithmic black-boxes, regulatory lag, and weak foundations. This study proposes measures from the aspects of data supply, talent cultivation, …

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Artificial Intelligence For Scientific Research: Strategic Landscape And Development Recommendations, Jiaofeng Pan, Feng Zhang, Jing Wu Oct 2026

Artificial Intelligence For Scientific Research: Strategic Landscape And Development Recommendations, Jiaofeng Pan, Feng Zhang, Jing Wu

Bulletin of Chinese Academy of Sciences (Chinese Version)

Artificial intelligence is currently driving the evolution of scientific research toward a “fifth paradigm” characterized by intelligence. Major global economies are elevating the integration of AI into scientific research (AI for Science, AI4S) to the level of national strategy, rapidly rolling out strategic plans and policy measures amidst intensifying global strategic competition in this field. Based on analyzing the typical paradigms and strategic value of AI4S, this study examines the global strategic landscape by focusing on major economies such as the United States, the European Union, and Japan; compares and analyzes their policy frameworks regarding organizational coordination, platform development, and …

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Two Modes Of Sustainable Development Transition, Shuai Zhang, Dajian Zhu Oct 2026

Two Modes Of Sustainable Development Transition, Shuai Zhang, Dajian Zhu

Bulletin of Chinese Academy of Sciences (Chinese Version)

Sustainable development has become a global consensus. Every country should carry out sustainable development transition. Due to large differences in development stages and the ecological impacts imposed on the Earth, developed countries and developing countries ought to adopt different modes of sustainable development transition. By using the Doughnut model as an analytical tool, which has made a significant impact at the forefront of sustainable development research, this paper thoroughly discusses the two modes of sustainable development transition. The Transition Mode of Developed Countries (Mode B) refers to transition from the outer circle to the middle circle of the Doughnut model. …

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Resource Security Research In China In The New Era: Evolving Concepts, Paradigm Shifts, And Strategic Pathways, Dong Jiang, Jinwei Dong, Yanzhao Yang, Jingying Fu Oct 2026

Resource Security Research In China In The New Era: Evolving Concepts, Paradigm Shifts, And Strategic Pathways, Dong Jiang, Jinwei Dong, Yanzhao Yang, Jingying Fu

Bulletin of Chinese Academy of Sciences (Chinese Version)

Resource security serves as a critical foundation for safeguarding national security and underpinning high-quality socioeconomic development. Major geopolitical conflicts, such as the Russia–Ukraine conflict and the US-Israeli strikes on Iran, have intensified turbulence across global resource supply chains, positioning resource security as a central arena of strategic competition among nations. As a major consumer and trading power in global resource markets, China faces persistently high import dependence for critical mineral resources, and the pressure to ensure resource security amid the pursuit of high-quality development continues to mount. Against this backdrop, resource security is evolving from a narrow focus on supply …

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Progress, Challenges, And Policy Recommendations For China’S Climate Investment And Financing Pilot Zones In Context Of Carbon Neutrality, Xianchun Tan, Zhaoyang Deng, Chenxu Wang, Zhe Peng Oct 2026

Progress, Challenges, And Policy Recommendations For China’S Climate Investment And Financing Pilot Zones In Context Of Carbon Neutrality, Xianchun Tan, Zhaoyang Deng, Chenxu Wang, Zhe Peng

Bulletin of Chinese Academy of Sciences (Chinese Version)

To implement the decisions and arrangements of the Central Committee of the Communist Party of China and the State Council on addressing climate change and to channel more capital toward climate action, China launched its first batch of 23 climate investment and finance pilot areas in 2022. Through the end of 2025, this study tracks and assesses of pilot development, synthesizes innovative models, identifies major challenges, and proposes policy recommendations. The results show that the pilot areas have made solid progress, with more than 260 supporting policy documents issued and over 6 300 projects, representing total planned investment exceeding RMB …

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Toward 2035: 20 Fundamental Scientific Problems In Artificial Intelligence, Working Group For Artificial Intelligence Advancement Chinese Academy Of Sciences Oct 2026

Toward 2035: 20 Fundamental Scientific Problems In Artificial Intelligence, Working Group For Artificial Intelligence Advancement Chinese Academy Of Sciences

Bulletin of Chinese Academy of Sciences (Chinese Version)

The development of the artificial intelligence （AI） discipline is effectively expanding the capability boundaries of AI. To explore the foundational theories and underlying core technologies for next-generation of general AI, the Chinese Academy of Sciences (CAS) has formulated 20 fundamental scientific problems in AI. Centered on “disciplinary reconstruction of AI foundational theories (Y+AI)” and “AI-enabled applications of complex systems across multiple domains (AI+X)”, these problems are characterized by multiple complexities including openness, high dimensionality, high dynamism, large scale, and cross-scale properties.

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A Pick-The-Winner Design Framework For Two-Arm Randomized Clinical Trials, Wanni Lei, Vernon M. Chinchilli, Xi Kathy Zhou Oct 2026

A Pick-The-Winner Design Framework For Two-Arm Randomized Clinical Trials, Wanni Lei, Vernon M. Chinchilli, Xi Kathy Zhou

COBRA Preprint Series

We propose a general pick-the-winner design framework for two-arm randomized clinical trials with binary and continuous endpoints that meets prespecified type I error rate and power requirements for winner selection. Traditional two-group comparison tests often require sample sizes that are impractical in early phase trials. Existing pick-the-winner designs offer an efficient alternative but generally emphasize the probability of correct selection rather than explicit control of type I and II error rates for winner selection. Our framework comprises four components: pick-the-winner-based hypotheses, winner selection strategies, definitions of type I error rate and power for winner selection, and design calibration. It accommodates …

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Constructing The Cyber Workforce Gap: Measurement And Its Consequences, Ryan Straight Oct 2026

Constructing The Cyber Workforce Gap: Measurement And Its Consequences, Ryan Straight

Journal of Cybersecurity Education, Research and Practice

Cyber workforce-gap figures steer federal strategy, industry advocacy, and the growth of educational programs. Rather than estimating the U.S. gap, this review examines how the estimates are made: through job-posting analytics, survey-based estimation, and federal accounting, each of which must assume its way from instrument to labor market. A census of this journal's complete run illustrates what those figures underwrite in one venue: of 176 items published across eleven years, 51 invoke a labor-market workforce claim, 46 treat it as settled fact, and only one, an editorial, interrogates it. Meanwhile, the producers and auditors of those figures have diverged. Between …

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Repeated Games In The Presence Of Incomplete Information, Reza Habibi Oct 2026

Repeated Games In The Presence Of Incomplete Information, Reza Habibi

The Journal of Economics and Politics

There are many strategic situations at which a game theoretical framework should be used to analyze the equilibrium decisions at which the incomplete information annoy the process of deriving the certain rules for making decisions. In these cases, players use signals of each other's to get proper decisions. For example, in economic environment, some macro-economic latent variables induce incomplete information. Morris and Shin (2000) referred this type of game as global game and studied one-shot type of it. However, in practical situations, it is a type of repeated game. In the current paper, following notations of Morris and Shin (2000), …

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Swaag Award Press Release, Arkansas State University - Jonesboro Oct 2026

Swaag Award Press Release, Arkansas State University - Jonesboro

Study Abroad - Dominica 2026

Jessica Harvey won first place in the undergraduate paper category at the annual Southwestern Division American Association of Geographers (SWAAG).

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Agrivoltaics: Combining Food And Solar Power On Agricultural Lands, Dharla Soteros, Kendall Becker, Spencer J. Good, Ngoni Mufute, Matt Yost, Logan Mitchell, Scott Hotaling Oct 2026

Agrivoltaics: Combining Food And Solar Power On Agricultural Lands, Dharla Soteros, Kendall Becker, Spencer J. Good, Ngoni Mufute, Matt Yost, Logan Mitchell, Scott Hotaling

All Current Publications

Utah’s ranchers and farmers face pressure to sell land to developers, conserve water, and manage increasing production costs (Li et al., 2019). One way producers can keep growing food while diversifying and increasing revenue is by integrating agriculture and solar electricity generation on the same land, a practice known as agrivoltaics. In this fact sheet, the authors describe agrivoltaic setup options, summarize agrivoltaics' impacts on livestock and crop production, and discuss implementation economics.

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Specification And Internal Assessment Of A Self Reported Protective Application Use Composite Among Computer Science Undergraduates In Enugu State Nigeria, Adesegun Nurudeen Osijirin, Leonard C. Anigbo, Oliver Okechukwu Oct 2026

Specification And Internal Assessment Of A Self Reported Protective Application Use Composite Among Computer Science Undergraduates In Enugu State Nigeria, Adesegun Nurudeen Osijirin, Leonard C. Anigbo, Oliver Okechukwu

Journal of Cybersecurity Education, Research and Practice

This study specifies a Protective Application Use Composite restricted to self-reported protective application use. A cross-sectional survey provided 364 complete records from Computer Science undergraduates at four universities in Enugu State, Nigeria, from 393 distributed questionnaires. The score is the equal-weight average of five questionnaire categories: antivirus, firewall, encryption, multi-factor authentication, and virtual private network use. Reanalysis of the author-supplied item records yielded category means from 2.097 to 2.376 and internal-consistency coefficients from 0.958 to 0.971. The composite mean was 2.170, with a standard deviation of 0.469. The first component of the category-score correlation matrix explained 50.98 percent of variance. …

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Markets For Unverified Capability: Why Organizations Facing Real Adversarial Scrutiny Reject The Metrics Academic Ai-Security Research Relies On, Babar Khan Akhunzada Oct 2026

Markets For Unverified Capability: Why Organizations Facing Real Adversarial Scrutiny Reject The Metrics Academic Ai-Security Research Relies On, Babar Khan Akhunzada

Journal of Cybersecurity Education, Research and Practice

Governments, insurers, and defenders increasingly rely on published capability claims about AI cybersecurity agents to inform procurement, regulation, and risk assessment. Yet a striking pattern runs through the organizations with the most at stake: enterprises and technology companies deploying frontier AI agents against real production infrastructure consistently decline to publish the accuracy metrics that academic and vendor benchmarks compete to report. This paper investigates that pattern as an economic, organizational, and policy problem rather than a purely technical one. We audit eleven independently published AI cybersecurity benchmarks and deployments using a five-dimension integrity rubric and find that benchmarks relying on …

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Final Quarterly Operations And Maintenance Report: Butte Treatment Lagoon System – First Quarter 2026, Pioneer Technical Services, Inc. Oct 2026

Final Quarterly Operations And Maintenance Report: Butte Treatment Lagoon System – First Quarter 2026, Pioneer Technical Services, Inc.

Silver Bow Creek/Butte Area Superfund Site

No abstract provided.

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Towards Transparency In Sampling For Plant Xylem Water Isotope Studies: Current Practices And New Perspectives, Magali F. Nehemy, Hannes P.T. De Deurwaerder, Ginevra Fabiani, Gregory R. Goldsmith, W. Jesse Hahm, Danielle Hudson, Suzanne Jacobs, Huai Jianjun, James Knighton, Marco M. Lehmann, Pedro A. M. Leite, Kevin Li, Min Li, Xiuqiang Liu, Aline Meyer Oliveira, Yunpeng Nie, Natalie Orlowski, Daniele Penna, María Poca, Ricardo Sánchez-Murillo, Hongxiu Wang, Mingyi Wen, Lixin Wang, Seth E. Younger, Giulia Zuecco, Scott T. Allen Oct 2026

Towards Transparency In Sampling For Plant Xylem Water Isotope Studies: Current Practices And New Perspectives, Magali F. Nehemy, Hannes P.T. De Deurwaerder, Ginevra Fabiani, Gregory R. Goldsmith, W. Jesse Hahm, Danielle Hudson, Suzanne Jacobs, Huai Jianjun, James Knighton, Marco M. Lehmann, Pedro A. M. Leite, Kevin Li, Min Li, Xiuqiang Liu, Aline Meyer Oliveira, Yunpeng Nie, Natalie Orlowski, Daniele Penna, María Poca, Ricardo Sánchez-Murillo, Hongxiu Wang, Mingyi Wen, Lixin Wang, Seth E. Younger, Giulia Zuecco, Scott T. Allen

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

Xylem water isotope values are widely used to trace plant water sources. However, the sampling decisions that precede extraction are rarely fully reported in isotope studies, limiting reproducibility and cross comparisons. A survey of 42 researchers across five continents, complemented by a virtual community workshop, revealed substantial methodological diversity: only 51% maintain standard operating procedures, with variation in organ selection among respondents (branches 73.8%, stems 64.3%, roots 35.7%), sapwood-heartwood separation (63.2% separate), bark removal (59% always) and transport conditions (56% ice packs vs. 39% ambient). From the surveyed researchers, 77.5% adapt sampling strategies to their extraction system, but these adaptations …

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Wilson's Phalarope, A Migratory Bird, Depends On The Declining Great Salt Lake, William Christenson, Kendall Becker, Spencer J. Good, T.J. Clark-Wolf, Scott Hotaling Oct 2026

Wilson's Phalarope, A Migratory Bird, Depends On The Declining Great Salt Lake, William Christenson, Kendall Becker, Spencer J. Good, T.J. Clark-Wolf, Scott Hotaling

All Current Publications

This fact sheet describes how declining water levels and increasing salinity degrade habitat for brine flies and other prey Wilson’s phalaropes rely on. Because human use drives low water levels, changes to water management could reverse the lake’s decline and improve habitat quality for Wilson’s phalaropes and other species that depend on the Great Salt Lake.

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Research On Data Risk And Governance Of Generative Artificial Intelligence Empowering Intelligence Work, Yonghui Guo, Xiaobei Guo, Yuan Feng, Yapeng Li Oct 2026

Research On Data Risk And Governance Of Generative Artificial Intelligence Empowering Intelligence Work, Yonghui Guo, Xiaobei Guo, Yuan Feng, Yapeng Li

Journal of Scientific Information Research

[Purpose/significance] Generative Artificial Intelligence（GAI）generates numerous data risks in the process of empowering intelligence work. Fully understanding, identifying, and governing the data risks are the key to the effective empowerment of intelligence work by GAI. [Method/process] Based on the four stages of intelligence work, this paper subdivides the main data activities in intelligence work empowered by generative artificial intelligence from the perspective of the data workflow. Based on risk management theory, the data risks in data input, data processing, data content generation and data content dissemination, are systematically analyzed and identified. From three perspectives of institution, subject, and technology, a data …

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Computing The Greatest Common Divisor Of Binomial Coefficients C(Mn, Mk), Chai Wah Wu Oct 2026

Computing The Greatest Common Divisor Of Binomial Coefficients C(Mn, Mk), Chai Wah Wu

Communications on Number Theory and Combinatorial Theory

The greatest common divisor (GCD) of C(2n,2k) for 1 ≤ k < n is known to be some power of 2 times the product of all odd primes p such that 2n = pi + pj. We complete the analysis of this GCD by showing that its 2-adic valuation is at most 1 and relates it to Mersenne primes. We also show how to efficiently compute GCD {C(mn,mk) : 1 ≤ k < n} when n and m satisfy certain conditions.

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Twinning Behavior Of Molecule-Adapted Gaussian-Type Orbitals (Gtos) In Cyclo-Hydrocarbons, Tong-Hyok Cha, Gum-Chol Kim, Kwang-Jin Ri, Jin-Nam Kim, Yong-Su Pak Oct 2026

Twinning Behavior Of Molecule-Adapted Gaussian-Type Orbitals (Gtos) In Cyclo-Hydrocarbons, Tong-Hyok Cha, Gum-Chol Kim, Kwang-Jin Ri, Jin-Nam Kim, Yong-Su Pak

Turkish Journal of Chemistry

The saturated cyclo-hydrocarbons CnH2n (n = 3–7) were constructed by the iterative coupling of the structural unit groups (SUGs), specifically the SUG-CH2C2 fragment, which was previously established for molecular basis optimization. For the McLean–Chandler 6-311+G basis set, under the SUG perturbation, the outer (s′, p′) and diffuse (sʺ, pʺ) primitive Gaussian type orbitals for the core-atom C* of SUG-CH2C2 undergo an off-center spatial displacement into a twinning configuration. Specifically, the s-type twins (s′, sʺ) share identical Gaussian exponents and are symmetrically shifted toward the two neighboring carbon atoms, while the p-type twins (p′, pʺ) exhibit a matching configuration. Generally, this …

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Phytochemical Characterization, Cytotoxic Effects, And Potential Oxidative Dna Damage-Modulating Activities Of Arum Italicum Extract, Oznour Mourat Moustafa, Hülya Yağar Oct 2026

Phytochemical Characterization, Cytotoxic Effects, And Potential Oxidative Dna Damage-Modulating Activities Of Arum Italicum Extract, Oznour Mourat Moustafa, Hülya Yağar

Turkish Journal of Chemistry

Arum italicum is traditionally utilized in the Thrace region for the treatment of hepatic and dermatological disorders; however, experimental evidence supporting these ethnopharmacological applications remains limited. As oxidative stress-induced DNA damage is an important contributor to the pathogenesis of liver and skin diseases, the aim in the present study was to investigate the ability of A. italicum leaf and tuber extracts to modulate oxidative DNA damage in vitro using nontumorigenic and cancerous hepatic and cutaneous cell models. Phytochemical profiling, antioxidant capacity, and cytotoxic activity were also assessed to support and contextualize the observed DNA damage-related effects.In vitro investigations were conducted …

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Facile One-Step Activated Glassy Carbon Electrode For Sensitive Tryptophan Sensing In Yogurt, Sevi̇lay Erdoğan Kablan, Ahmet Çeti̇nkaya, Si̇bel Özkan, Emi̇rhan Nemutlu Oct 2026

Facile One-Step Activated Glassy Carbon Electrode For Sensitive Tryptophan Sensing In Yogurt, Sevi̇lay Erdoğan Kablan, Ahmet Çeti̇nkaya, Si̇bel Özkan, Emi̇rhan Nemutlu

Turkish Journal of Chemistry

Activation of glassy carbon electrodes (GCEs) in tailored solution environments introduces oxygenated surface functionalities such as hydroxyl, carboxyl, and quinone groups. These modifications enhance electron‐transfer kinetics and strengthen interactions with target analytes, thereby improving electrochemical sensitivity. In this study, square-wave voltammetry was used, and the most suitable supporting electrolyte for tryptophan (TRP) analysis was a pH 3 Britton–Robinson buffer. The cyclic voltammetry potential range and number of cycles for the Act-GCE were obtained as 0–1.5 V and seven cycles, respectively. The activated electrode exhibited excellent analytical performance, with a linear response for TRP over 0.20–6.28 μM, a detection limit of …

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Thiophene-Carbazole-Based Covalent Organic Polymer Electrodes For Electrochromic And Supercapacitor Applications, Si̇nem Altinişik Oct 2026

Thiophene-Carbazole-Based Covalent Organic Polymer Electrodes For Electrochromic And Supercapacitor Applications, Si̇nem Altinişik

Turkish Journal of Chemistry

In this study, a thiophene-carbazole-based conjugated organic polymer was successfully synthesized on indium tin oxide (ITO)/glass and graphite sheet substrates using in situ oxidative polymerization. In terms of electrochromic properties, the electrodes exhibited significant color change from light yellow-green to dark gray in the potential range of 0 V to 1.2 V, with optical contrast ranging from 84.2% to 47.2% and coloring efficiency of 171.3 cm2/C. The prepared PCBP-Th_ITO/glass electrode also exhibited fast switching times (tb = 0.89 s and tc = 2.05 s) at 650 nm. Furthermore, 90% optical stability was maintained after 1000 cycles. In terms of energy …

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Fabrication Of Cross-Linked Thiophene-Coumarin-Fluorene Donor–Acceptor Pentamer Thin Films For Electrochromic Devices Application, Ari̇fe Aktaş, Mert Akgün, Mücahi̇t Özdemi̇r, Sermet Koyuncu Oct 2026

Fabrication Of Cross-Linked Thiophene-Coumarin-Fluorene Donor–Acceptor Pentamer Thin Films For Electrochromic Devices Application, Ari̇fe Aktaş, Mert Akgün, Mücahi̇t Özdemi̇r, Sermet Koyuncu

Turkish Journal of Chemistry

Functionalized p-conjugated polymers have emerged as promising electrochromic materials due to their well-defined molecular structures, facile synthesis, and ability to form smooth and homogeneous thin films. Furthermore, surface cross-linking enhances the mechanical and environmental stability of these films while improving their durability during electrochemical operation. In this study, a unique band gap-tunable pentamer (FBP) was developed featuring a D-A-D-A-D configuration, which includes thiophene, coumarin, and fluorene. Cross-linked films (FBPX) were obtained using both spray and electrospray methods in the presence of tetrathiol-based crosslinkers and 366 nm light, thanks to the functionalizable allyl groups present in the FBP structure. UV–Vis analysis …

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Synthesis And Catalytic Activity Of Water-Soluble Ruthenium(Ii) P-Cymene Complexes In Tandem Nitroarene Reduction/N-Methylation And Transfer Hydrogenation, Si̇nem Çakir, Serdar Batikan Kavukcu, Hayati̇ Türkmen Oct 2026

Synthesis And Catalytic Activity Of Water-Soluble Ruthenium(Ii) P-Cymene Complexes In Tandem Nitroarene Reduction/N-Methylation And Transfer Hydrogenation, Si̇nem Çakir, Serdar Batikan Kavukcu, Hayati̇ Türkmen

Turkish Journal of Chemistry

In this study, a series of water-soluble ruthenium(II) p-cymene complexes bearing carboxylic acid-functionalized ligands (Ru1–Ru3) were synthesized, fully characterized (1H NMR, 13C NMR, and FT-IR), and evaluated in two distinct catalytic transformations: tandem nitroarene reduction/N-methylation and transfer hydrogenation. Of the catalysts tested, Ru1 exhibited superior catalytic activity in both systems. Under optimized conditions (1 mol% Ru1, 8 mmol NaBH4, 110 °C, 2 h in methanol), Ru1 promoted the one-pot tandem transformation of nitrobenzene to N-methylaniline with up to 93% conversion using methanol as a sustainable C1 and H2 source. Furthermore, Ru1 proved highly effective in the transfer hydrogenation of acetophenone …

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Samarium-Doped Ceria Catalysts For Boron-Aluminum Composite Propellants: Effect Of Synthesis Method, Di̇lara Güçtaş Gürel, Mehmet Ali̇ Faruk Öksüzömer Oct 2026

Samarium-Doped Ceria Catalysts For Boron-Aluminum Composite Propellants: Effect Of Synthesis Method, Di̇lara Güçtaş Gürel, Mehmet Ali̇ Faruk Öksüzömer

Turkish Journal of Chemistry

Solid propellants based on ammonium perchlorate (AP) are widely used in rocket and missile propulsion systems due to their high energy density and reliable combustion characteristics. Although aluminum (Al) is the conventional metal fuel in AP-based formulations, boron (B) has gained increasing attention as a partial or full substitute owing to its significantly higher volumetric energy density. However, the low combustion efficiency of boron particles remains a critical challenge, making the use of catalysts essential to enhance the thermal decomposition of AP and overall propellant-burning performance. In this study, samarium-doped ceria (SDC20) catalysts were synthesized by three different methods including …

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