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Items from 61 to 80 out of 1,624,878 results

article

MnO/N‐Doped Mesoporous Carbon as Advanced Oxygen Reduction Reaction Electrocatalyst for Zinc–Air Batteries

Jieting Ding, Shan Ji, Hui Wang, Dan J. L. Brett, more

Chemistry – A European Journal > 25 > 11 > 2868 - 2876

The development of alternative electrocatalysts exhibiting high activity in the oxygen reduction reaction (ORR) is vital for the deployment of large‐scale clean energy devices, such as fuel cells and zinc–air batteries. N‐doped carbon materials offer a promising platform for the design and synthesis of electrocatalysts due to their high ORR activity, high surface area, and tunable porosity. In this...

article

Temporary Disability

Disability Compliance for Higher Education > 24 > 8 > 16 - 16

An overview of the key topics faced by disability services providers with citations to noteworthy cases, statutes, regulations, and additional sources.

article

Synthesis of [7]Helicene Enantiomers and Exploratory Study of Their Conversion into Helically Chiral Iodoarenes and Iodanes

Kevin Antien, Laurent Pouységu, Denis Deffieux, Stéphane Massip, more

Chemistry – A European Journal > 25 > 11 > 2852 - 2858

The facile and convenient preparation of both enantiomers of a [7]helicene scaffold from inexpensive (l)‐(+)‐tartaric acid and 4‐methylstyrene is described. These helical structures were transformed into bis‐iodinated ether derivatives in order to explore their potential as precursors of novel chiral organoiodane reagents or as iodoarene pre‐catalysts. Promising results were obtained in hydroxylative...

article

Unravelling the Synthesis and Chemistry of Stable, Acyclic, and Double‐Deficient 1,3‐Butadienes: An endo‐Selective Diels–Alder Route to Hedgehog Pathway Inhibitors

Xiaoyi Xin, Stefan Zimmermann, Jana Flegel, Felix Otte, more

Chemistry – A European Journal > 25 > 11 > 2717 - 2722

The first synthetic access to stable and acyclic 1,3‐butadienes with two electron‐withdrawing carbonyl groups and their potential to deliver new molecular scaffolds through intriguing endo‐selective Diels–Alder cycloadditions are presented. The bicyclic scaffolds produced through the cycloaddition chemistry of electron‐deficient dienes afforded potent Hedgehog signaling pathway inhibitors.

article

HPLC determination of γ‐aminobutyric acid and its analogs in human serum using precolumn fluorescence labeling with 4‐(carbazole‐9‐yl)‐benzyl chloroformate

Yanxin Yu, Jinmao You, Zhiwei Sun, Zhongyin Ji, more

Journal of Separation Science > 42 > 4 > 826 - 833

In this study, a simple analytical method for the determination of γ‐aminobutyric acid, gabapentin, and baclofen by using high‐performance liquid chromatography with fluorescence detection was developed. An amidogen‐reactive fluorescence labeling reagent, 4‐(carbazole‐9‐yl)‐benzyl chloroformate was first used to sensitively label these analytes. The completed labeling of these analytes can be finished...

article

Fabrication of boron‐rich multiple monolithic fibers for the solid‐phase microextraction of carbamate pesticide residues in complex samples

Jiangyi Wu, Meng Mei, Xiaojia Huang

Journal of Separation Science > 42 > 4 > 878 - 887

To enrich carbamate pesticides from complex matrices, an adsorbent based on poly (vinylboronic anhydride pyridine complex‐co‐ethylenedimethacrylate) monolith was fabricated and utilized as the extraction phase of multiple monolithic fiber solid‐phase microextraction. Due to the abundant boron atoms in the monolith, the B–N coordination interaction between adsorbent and analytes play a key role in...

article

Enhancement of Faraday effect of transparent ferromagnetic Co‐MgF₂ granular film by introducing Fabry–Pérot resonant structure

Mitsunori Miyamoto, Toshiya Kubo, Yuta Fujishiro, Kenta Shiota, more

Electrical Engineering in Japan > 206 > 4 > 3 - 10

To detect the magnetic field using polarization of a light, transparent magnetic material having a Faraday effect is required. The Co‐MgF₂ granular film is promising as a candidate of the Faraday element for the magnetic field sensing. In this study, Fabry–Pérot resonant structure was introduced into the Co‐MgF₂ granular film to enhance the Faraday effect. It was found that the Faraday effect per...

article

Development of grid‐interconnection inverter with an islanding detection function by synchronized injection of harmonic active signal

Naoto Nunomura, Yoshiaki Yoshida, Hirokazu Suzuki

Electrical Engineering in Japan > 206 > 4 > 36 - 44

We propose the islanding detection method using harmonic current as active signal. The active signal can be injected in the suppressed direction of the harmonic voltage during grid interconnection. On the other hand, the active signal is injected in the synchronized direction of the harmonic voltage due to the loads during islanding operation. As the result, the harmonic voltage is increased and the...

article

Apoptotic effect of enterodiol, the final metabolite of edible lignans, in colorectal cancer cells

Min‐Kyoung Shin, Yong‐Deok Jeon, Jong‐Sik Jin

Journal of the Science of Food and Agriculture > 99 > 5 > 2411 - 2419

BACKGROUND Enterodiol (END) is transformed by human intestinal bacteria from lignans contained in various whole‐grain cereals, nuts, legumes, flaxseed, and vegetables. It is known to have several physiological effects, but its effects on mitogen‐activated protein kinase (MAPK) signaling and apoptosis in colorectal cancer (CRC) cells have not yet been elucidated. We therefore investigated the effects...

article

The case for comprehensive case notes in health sciences

Lisa M. Meeks, Enjie Hall

Disability Compliance for Higher Education > 24 > 8 > 1 - 5

In the world of health science education, the stakes get very high very fast. A simple delay in services can make the difference between success and failure in a course. Unlike other undergraduate education where a student can easily retake a failed course, two failed courses in an undergraduate or graduate health science program may result in dismissal from the program. Additionally, experiential...

article

Machine Learning Supporting Experimental Design for Product Development in the Lab

Jens Babutzka, Michael Bortz, Andreas Dinges, Gregor Foltin, more

Chemie Ingenieur Technik > 91 > 3 > 277 - 284

An interactive decision support framework is presented that assists lab researchers in finding optimal product recipes. Within this framework, an approach for sequential experimental design for black box models in a multicriteria optimization context is introduced. An additional criterion involving the prediction error to design new experiments is used with the goal to get a reliable estimate of the...

article

Comparison on predictors of mental health service use among Asian older adults

Seokho Hong

Asian Social Work and Policy Review > 13 > 1 > 46 - 57

Studies have mostly examined mental health service use of older Asian immigrant combining all Asian Americans into one group whereas immigration backgrounds and socioeconomic status of each Asian minority group are different. Therefore, this study aimed to identify predictors of mental health service use within specific ethnic groups among older Asian adults focusing on Chinese, Japanese, Korean,...

article

Active Ageing Index in Korea – Comparison with China and EU countries

Jinpil Um, Asghar Zaidi, Sung‐Jae Choi

Asian Social Work and Policy Review > 13 > 1 > 87 - 99

The evidence‐based policymaking relies on the use and robustness of the available data. Many conceptual and operational difficulties restrict this process, not least in making use of evidence to identify policy priorities. The Active Ageing Index (AAI), developed originally for the 28 European Union countries, offers a strong motivation in this respect. This paper reports on the development of the...

article

A Sliding Mode Multiobserver Based on an Uncoupled Multimodel: An Application on a Transesterification Reaction

Nesrine Montacer, Khadija Dehri, Samah Ben Atia, Ridha Ben Abdennour

Asian Journal of Control > 21 > 1 > 456 - 472

This paper concerns the design of robust sliding mode multiobserver for nonlinear systems. A discrete uncoupled multimodel structure is retained for the modeling of nonlinear systems. Unlike the classically used multimodel structures, the retained uncoupled multimodel is known by its flexibility of modeling, thus, the structures of the partial models are adapted to the complexity of the local models...

article

Design of Fractional‐Order Backstepping Sliding Mode Control for Quadrotor UAV

Xiaoyu Shi, Yuhua Cheng, Chun Yin, Sara Dadras, more

Asian Journal of Control > 21 > 1 > 156 - 171

This paper derives a nonlinear translational and rotational dynamic model of the quadrotor UAV. An original fractional‐order backstepping sliding mode control method for a typical quadrotor UAV is presented. The new approach can decrease the chattering phenomenon and increase the robustness of control strategy. The strongly coupled characteristics of the under‐actuated system are sought by the virtual...

article

Sliding Mode Differentiator Based Tracking Control of Uncertain Nonlinear Systems with Application to Hypersonic Flight

Hao An, Baris Fidan, Qianqian Wu, Changhong Wang, more

Asian Journal of Control > 21 > 1 > 143 - 155

This paper presents a performance‐guaranteed adaptive back‐stepping design for a class of nonlinear systems with uncertainties and disturbances. To circumvent the increasing complexity caused by the repeated analytic differentiations in back‐stepping, sliding mode differentiation technique is employed to estimate the derivative of the virtual control. Compared with the well‐known command filtered...

article

Terminal sliding mode observers for uncertain linear systems with matched disturbance

Mohammad Mousavi, Mostafa Rahnavard, Moosa Ayati, Mohammad Reza Hairi Yazdi

Asian Journal of Control > 21 > 1 > 377 - 386

In this paper, a terminal sliding mode observer (TSMO) for systems with general state‐space representation is proposed. The effects of uncertainties and matched disturbances are incorporated in the system dynamics. Compared to conventional sliding mode observers, which are capable of finite time convergence of the measured states’ (outputs) errors and asymptotic convergence of unmeasured states’ errors,...

article

A Robust Control Scheme Based on Sliding Mode Observer to Drive a Knee‐Exoskeleton

Saber Mefoued, Djamel Eddine Chouaib Belkhiat

Asian Journal of Control > 21 > 1 > 439 - 455

In this paper, a robust control scheme to drive a knee‐exoskeleton has been designed to assist people with limited knee movement. Dynamic modeling and parameter identification of the “subject's lower limb‐exoskeleton” has been performed and a sliding mode observer (SMO) developed and integrated in the system's closed loop to provide velocity. Lyapunov's theory allows demonstration of the stability...

article

Image features and DUS testing traits for peanut pod variety identification and pedigree analysis

Limiao Deng, Zhongzhi Han

Journal of the Science of Food and Agriculture > 99 > 5 > 2572 - 2578

BACKGROUND DUS (Distinctness, Uniformity and Stability) testing of new varieties is an important method for peanut germplasm evaluation and identification of varieties. In order to verify the feasibility of variety identification for peanut DUS testing based on image processing, 2000 peanut pod images from 20 varieties were obtained by a scanner. Initially, six DUS testing traits were quantified...

article

Transient heat stress during tuber development alters post‐harvest carbohydrate composition and decreases processing quality of chipping potatoes

James S Busse, Amy E Wiberley‐Bradford, Paul C Bethke

Journal of the Science of Food and Agriculture > 99 > 5 > 2579 - 2588

BACKGROUND Adverse air and soil temperatures are abiotic stresses that occur frequently and vary widely in duration and magnitude. Heat stress limits productivity of cool‐weather crops such as potato (Solanum tuberosum) and may degrade crop quality. Stem‐end chip defect is a localized discoloration of potato chips that adversely affects finished chip quality. The causes of stem‐end chip defects are...

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INFONA - science communication portal

Search results

MnO/N‐Doped Mesoporous Carbon as Advanced Oxygen Reduction Reaction Electrocatalyst for Zinc–Air Batteries

Temporary Disability

Synthesis of [7]Helicene Enantiomers and Exploratory Study of Their Conversion into Helically Chiral Iodoarenes and Iodanes

Unravelling the Synthesis and Chemistry of Stable, Acyclic, and Double‐Deficient 1,3‐Butadienes: An endo‐Selective Diels–Alder Route to Hedgehog Pathway Inhibitors

HPLC determination of γ‐aminobutyric acid and its analogs in human serum using precolumn fluorescence labeling with 4‐(carbazole‐9‐yl)‐benzyl chloroformate

Fabrication of boron‐rich multiple monolithic fibers for the solid‐phase microextraction of carbamate pesticide residues in complex samples

Enhancement of Faraday effect of transparent ferromagnetic Co‐MgF₂ granular film by introducing Fabry–Pérot resonant structure

Development of grid‐interconnection inverter with an islanding detection function by synchronized injection of harmonic active signal

Apoptotic effect of enterodiol, the final metabolite of edible lignans, in colorectal cancer cells

The case for comprehensive case notes in health sciences

Machine Learning Supporting Experimental Design for Product Development in the Lab

Comparison on predictors of mental health service use among Asian older adults

Active Ageing Index in Korea – Comparison with China and EU countries

A Sliding Mode Multiobserver Based on an Uncoupled Multimodel: An Application on a Transesterification Reaction

Design of Fractional‐Order Backstepping Sliding Mode Control for Quadrotor UAV

Sliding Mode Differentiator Based Tracking Control of Uncertain Nonlinear Systems with Application to Hypersonic Flight

Terminal sliding mode observers for uncertain linear systems with matched disturbance

A Robust Control Scheme Based on Sliding Mode Observer to Drive a Knee‐Exoskeleton

Image features and DUS testing traits for peanut pod variety identification and pedigree analysis

Transient heat stress during tuber development alters post‐harvest carbohydrate composition and decreases processing quality of chipping potatoes

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