bluuebunny/crossref_metadata_2025 huggingface dataset:
Oficina acadêmica: bases curriculares e Medicina de Família e Comunidade
Authors: Calixto Phelipe Antônio , Bandina Celice , Oliveira Haniel Caetano de , Assis Filho Hermano Lúcio Gomes de , Matos Gustavo Faria de , César Camillo de Alcântara , Damasceno Adriano Aparecido Correia , Souza Neto Aureliano Inácio de , Oliveira Daniel Camilo de , Pereira Giovanna de Faria Alvim , Rocha Luana Bandeira , Moraes Matheus Bueno de , Ishisaki Nathália Lie , Melo Rafael César , Nicolau Theara de Castro
Published: January 2013

De acordo com as Novas Diretrizes Curriculares Nacionais da Graduação Médica (NDCN) e sua orientação para uma postura crítica e reflexiva do acadêmico realizou-se a oficina “Bases curriculares e Medicina de Família e Comunidade” durante o IV Congresso Mineiro de Medicina de Família e Comunidade (IVCMMFC), em Belo Horizonte - MG, 12 de junho de 2009. A oficina tratou sobre a inserção da especialidade, Medicina de Família e Comunidade (MFC), na graduação, discutindo os métodos de ensino médico: Aprendizado baseado em problematização (PBL), método integrado de ensino e método tradicional Flexneriano. A oficina foi dividida em três momentos. Primeiramente, foi proposta adequação de algumas definições da literatura médica: Atenção Primária à Saúde, Médico generalista, Médico sanitarista, Especialista em Clínica Médica e Médico de Família e Comunidade. Após, foram discutidas as Novas diretrizes curriculares; o Relatório Flexner e sua influência nos modelos de ensino existentes (tradicional, problematizado e integrado), o momento oportuno para inserção da MFC na graduação e qual método de ensino utilizar. O tema do preconceito contra a especialidade surgiu nas discussões, assim como adequação da MFC e níveis de serviço (primário, secundário e terciário) e como valorizar a especialidade sem ¨super-especializar¨ o estudante. As conclusões levantadas na oficina foram descritas neste documento e apresentadas em plenária ao final do congresso.
Consumo de bebidas alcoólicas entre trabalhadores de uma unidade de Saúde da Família em Vitória, Espírito Santo, Brasil
Authors: Fontenelle Leonardo Ferreira
Published: January 2013

Objetivo: Descrever o consumo de bebidas alcoólicas por trabalhadores da Atenção Primária à Saúde (APS). Métodos: Em dezembro de 2011 e fevereiro de 2012 realizou-se um levantamento anônimo com trabalhadores da APS numa unidade de Saúde da Família em Vitória (ES), através de questionário autoadministrado, com questões sobre frequência, quantidade usual e consumo em binge extraídas de um levantamento nacional. Foram obtidos ainda dados sociodemográficos e ocupacionais. Resultados: Dentre os 59 trabalhadores elegíveis, 53 (90%) participaram do levantamento. Ninguém relatou consumo muito frequente (5 dias ou mais por semana), mas 60% (32/53) relataram pelo menos um episódio de consumo nos últimos 12 meses. 76% (39/51; porém, 2 não responderam) relataram consumir usualmente 2 doses ou menos por dia de consumo. O consumo em binge foi relatado por 51% (27) de todos os 53 trabalhadores, ou seja, 84% dos 32 que consomem bebidas alcoólicas. Os trabalhadores de nível superior tiveram a menor prevalência de abstinência (19%; 3/16) e a menor proporção de consumo em binge entre os que consomem bebidas alcoólicas (69%; 9/13). Conclusões: Os trabalhadores dessa unidade de Saúde da Família apresentaram um consumo usualmente moderado de bebidas alcoólicas, mas a maioria consumiu em binge alguma vez nos últimos 12 meses. É necessário estudar no Brasil a relação entre o padrão de consumo de bebidas alcoólicas pelo trabalhador da APS e seu papel na detecção do uso problemático de álcool.
Avaliação de um programa de formação baseado no Mentoring para aquisição de habilidades em pequena cirurgia num centro de saúde urbano em Jaén, Andaluzia, Espanha
Authors: Perez-Milena Alejandro , Simao-Aiex Leticia , Ramirez-Picó Maria Araceli , Juárez-Jimenez Maria Villa
Published: January 2013

Objetivos: Avaliar a implantação de um programa de tutoria em habilidades para a pequena cirurgia em um centro de saúde urbano. Desenho e métodos: Estudo descritivo transversal numa zona básica de saúde urbana composta por 16000 habitantes. Recolhemos todas as intervenções cirúrgicas realizadas durante os anos de 2009, 2010 e 2011. Estas foram divididas em dois grupos. Um primeiro grupo que compreende aquelas intervenções que foram autorizadas por um médico com experiência, e outro onde encontramos as não tutoradas. Também foram considerados os tipos de intervenção, existência de consentimento informado e o envio de amostras a anatomia patológica. Resultados: Foram realizadas um total de 363 intervenções (101 em 2009, 114 em 2010 e 148 em 2011), 45% autorizadas, sem encontrar diferenças por ano de realização nem por tipo de intervenção (59% extirpação de verrugas, 25% infiltrações, 7% quistos epidérmicos). Participaram da proposta, principalmente médicos residentes (96%), seguidos de médicos de família (62%) e por último a equipe de enfermagem (29%). Um maior número de peças cirúrgicas foram enviadas a anatomia patológica nos atos cirúrgicos tutorados (83% vs 62%, p < 0.05 test c²) assim como, houve um melhor preenchimento do consentimento informado. Conclusões: O sistema de formação em habilidades por mentoring em “Pequena Cirurgia” implicou progressivamente no restante de profissionais do Centro de Saúde, aumentou a quantidade de atos cirúrgicos realizados e melhorou a qualidade do programa. Aproveitar as habilidades dos profissionais que trabalham em Atenção Primária à Saúde (APS) para formar os colegas, pode atuar como catalizador para aumentar a capacidade de resposta e inovação.
Partenaire mais distincte ?
Authors: Lachmann Niels
Published: January 2013

L’action extérieure de l’Union européenne est censément placée sous le signe du multilatéralisme efficace, un engagement à coopérer avec d’autres acteurs multilatéraux et à les renforcer. L’étude de l’articulation entre la Politique de sécurité et de défense commune de l’ue et les organisations qui sont identifiées comme ses partenaires dans la gestion des crises internationales montre cependant que les dynamiques institutionnelles sont beaucoup plus ambiguës. Cette ambiguïté marque tant la culture stratégique de l’ue concernant l’emploi de la force dans son action extérieure que les communautés de pratique formées par du personnel des organisations ou de leurs membres.
PRELIVANJE KAPITALA IZ REALNOG U BANKARSKI SEKTOR SRBIJE U TRANZICIONOM PERIODU
Authors: Aničić Jugoslav , Laketa Marko , Vukotić Svetlana
Published: January 2013

Realni sektor privrede Srbije poslednjih par godina posluje u uslovima hronične nelikvidnosti i visoke zaduženosti koji dovode do daljeg pada zaposlenosti i konkurentnosti preduzeća. Na drugoj strani, u istom periodu, bankarski sektor ostvaruje konstantan rast neto prihoda od kamata, naknada i provizija. Ova kontradiktorna kretanja otvaraju neka suštinska pitanja ekonomskog sistema, a pre svega da u celom tranzicionom periodu traje proces prelivanja kapitala iz realnog ka bankarskom sektoru. U radu će biti analizirani odnosi realnog i bankarskog sektora, ostvareni rezultati u kriznom periodu, posledice ekonomske politike na razvoj ovih sektora, kao i predlog mera za prevazilaženje trenutnog stanja.
PROBLEMI U IZBORU SOFTVERA ZA IMPLEMENTACIJU BALANCED SCORECARD-a
Authors: Arsić Ljiljana , Milićević Zoran , Premović Jelena
Published: January 2013

Kompleksnost Balanced Scorecard sistema upravljanja ukazuje na neminovnost korišćenja softverskih paketa u cilju jednostavnije implementacije za sve zaposlene i na svim nivoima u kompaniji. U skladu sa tim izvršena je analiza i preispitivanje raspoloživih softvera za BSC sa ciljem da se nađe najpovoljnije rešenje. Pri izboru softverskog paketa za BSC treba imati u vidu da BSCCol (Balanced Scorecard Colaborative) certifikuje samo one softverske pakete koji zadovoljavaju Kaplan-Nortonova ograničenja. Imajući u vidu da je broj raspoloživih softvera na tržištu ogroman, za implementaciju BSC-a neophodno je izvršiti sistemske analize kako bi se za konkretnu organizaciju izabralo najpogodnije rešenje. Standardom ISO/IEC 9126-1 koji se koristi za ocenu kvaliteta softvera neophodno je ispuniti sledeće kriterijume i to: funkcionalnost, pouzdanost, efikasnost, održavanje, portabilnost, upotrebljivost.
A novel GTP-binding protein–adaptor protein complex responsible for export of Vangl2 from the trans Golgi network
Authors: Guo Yusong , Zanetti Giulia , Schekman Randy
Published: January 2013

Planar cell polarity (PCP) requires the asymmetric sorting of distinct signaling receptors to distal and proximal surfaces of polarized epithelial cells. We have examined the transport of one PCP signaling protein, Vangl2, from the trans Golgi network (TGN) in mammalian cells. Using siRNA knockdown experiments, we find that the GTP-binding protein, Arfrp1, and the clathrin adaptor complex 1 (AP-1) are required for Vangl2 transport from the TGN. In contrast, TGN export of Frizzled 6, which localizes to the opposing epithelial surface from Vangl2, does not depend on Arfrp1 or AP-1. Mutagenesis studies identified a YYXXF sorting signal in the C-terminal cytosolic domain of Vangl2 that is required for Vangl2 traffic and interaction with the μ subunit of AP-1. We propose that Arfrp1 exposes a binding site on AP-1 that recognizes the Vangl2 sorting motif for capture into a transport vesicle destined for the proximal surface of a polarized epithelial cell.
Faculty appointments and the record of scholarship
Authors: Brand Amy
Published: January 2013

Academic review committees would benefit from more details about the contributions made by individual researchers to papers with multiple authors, and also from more information about other types of scholarly communication.
¡Ay! Pues yo, trabajando en el gerundio
Authors: Moreno Arlanda
Published: January 2013

El uso del gerundio no perifrástico en oraciones independientes, es decir no subordinadas a un predicado principal, ha sido descrito muy poco en la gramática del español. Creo que el uso que los hablantes hacen de esta construcción en narraciones cortas ofrece una interesante aproximación al estudio de las estrategias afectivas que usan los hablantes en el discurso. En consecuencia, se propone considerar los gerundios independientes como  uno de los diversos mecanismos afectivos que los hablantes utilizan en la lengua hablada para acercar al interlocutor a la narración.
Verbos y nombres psicológicos: juntos y revueltos
Authors: Marín Rafael , Sánchez Marco Cristina
Published: January 2013

En este artículo ofrecemos un estudio sobre las propiedades semánticas y –en menor medida, morfológicas– de los predicados psicológicos. Ponemos especial énfasis en las propiedades que parecen afectar de forma similar a verbos (odiar, preocupar(se)) y a nombres psicológicos (odio, preocupación). Por lo que respecta a los verbos, en la línea sugerida por Fábregas y Marín (2012), demostramos que todos ellos, tanto los de experimentante sujeto (odiar) como los de experimentante objeto (preocupar(se)) denotan estados, si bien los primeros denotan estados individual-level (IL), mientras que los segundos describen estados stage-level (SL). Por lo que respecta a los nombres, de acuerdo con Sanromán (2012), comprobamos que también responden a esta división entre nombres psicológicos de estado IL (odio) y de estado SL (preocupación). Los verbos de apoyo que acompañan a unos nombres y a otros constituyen uno de los indicios más claros de tal distinción: el significado básico de los verbos de apoyo de nombres IL (guardar, tener) es el de posesión; los verbos de apoyo de nombres SL (pasar, salir) expresan, en cambio, desplazamiento. Esta distinción nos permite afinar más el análisis de los verbos psicológicos: los de experimentante sujeto no han sufrido cambio alguno, mientras que los de experimentante objeto son fruto de un cambio de estado equiparable a un cambio de ubicación, esto es, a un desplazamiento. El análisis que ofrecemos, basado en la causatividad, es aplicable tanto a verbos como a nombres: los predicados psicológicos que denotan estados SL contienen un operador causativo del que los predicados psicológicos que denotan estados IL carecen.
Factors Affecting Morbidity and Mortality in Patients Who Underwent Emergency Operation for Incarcerated Abdominal Wall Hernia
Authors: Gul Mesut , Aliosmanoglu Ibrahim , Kapan Murat , Onder Akin , Taskesen Fatih , Arikanoglu Zulfu , Tacyildiz Ibrahim
Published: January 2013

Patients with incarcerated abdominal wall hernias (AWHs) are often encountered in emergency care units. Despite advances in anesthesia, antisepsis, antibiotic therapy, and fluid therapy, the morbidity and mortality rates for these patients remain high. Between 2006 and 2011, we retrospectively analyzed the cases of 131 patients who underwent emergency surgery for incarcerated abdominal wall hernias. Of these, there were 70 women (53.4%) and 61 men (46.6%) with an average age of 63.3 ± 17.4 years (range, 17–91 years). Morbidity was observed in 28 patients (21.4%), and the mortality rate was 2.3%. Intestinal resection, presence of concomitant disease, and general anesthesia were the independent variants that affected morbidity of patients with incarcerated abdominal wall hernias.
A Case of Successful Conservative Treatment for Chylous Ascites After Living-Donor Liver Transplantation
Authors: Shiba Hiroaki , Wakiyama Shigeki , Gocho Takeshi , Ishida Yuichi , Misawa Takeyuki , Yanaga Katsuhiko
Published: January 2013

A 46-year-old man underwent living-donor liver transplantation and splenectomy for primary biliary cirrhosis. On postoperative day 22, cloudiness of ascites increased, and triglyceride concentration in ascites was as high as 1046 mg/dL. With a diagnosis of chylous ascites, total parenteral nutrition was started. Nine days after starting total parenteral nutrition, cloudiness of ascites decreased, and triglycerides in ascites decreased to 93 mg/dL. Oral intake was restarted, and the patient was discharged on postoperative day 46. Chylous ascites is a rare complication after living-donor liver transplantation for which total parenteral nutrition may be useful.
Left-Sided Sigmoid Diverticulitis Presenting as Right-Sided Thigh Abscess
Authors: Murphy Patrick Bates , Belliveau Paul
Published: January 2013

Acquired diverticular disease of the colon is very common in the North American population. Atypical presentations are usually due to complications and rarely the predominant complaint may be related to an associated fistula. Thigh abscesses due to colocutaneous fistula represent an uncommon complication of sigmoid diverticulitis. In rare cases, a thigh abscess may be the only symptom, but gas in the thigh should raise the index of suspicion for bowel pathology. We report the second known case of a left-sided sigmoid diverticulitis leading to an isolated right thigh abscess with no gastrointestinal symptoms.
Effect of Shorter Term of Intravenous Infusion for Reduction of Catheter-Related Bloodstream Infection After Gastrectomy
Authors: Kawamura Hideki , Tanioka Toshiro , Kuji Mariko , Shibuya Kazuaki , Takahashi Masahiro
Published: January 2013

After gastrectomy, a longer period of intravenous alimentation is required than for other digestive surgeries, portending a higher risk of catheter-related bloodstream infection (CRBSI). From assessment of CRBSI occurring between 2004 and 2007 (preintervention group), the duration of intravenous infusion between 2008 and 2010 (postintervention group) was changed to shorter-term (6-day) infusion. To verify the effect of changes in injection schedule on the incidence of CRBSI, the occurrence of CRBSI was studied comparatively among preintervention and postintervention cases, excluding cases requiring intravenous infusion preoperatively, and cases requiring long-term intravenous infusion postoperatively due to postoperative complications. The rate of CRBSI in the postintervention group (0%; 0 of 298) was significantly lower than that in the preintervention group (1.7%; 8 of 477; P = 0.026). There was no significant difference between preintervention and postintervention groups in postoperative complications. Six-day infusion decreased the incidence of CRBSI after gastrectomy significantly, without increasing postoperative complications.
Retained Foreign Body After Laser Ablation
Authors: Ren Shiyan , Liu Peng , Wang Wei , Yang Yuguan
Published: January 2013

Laser ablation for varicose veins is a common practice, and postoperative complications may happen. A retained foreign body could be left accidently in the treated leg. It is rarely reported in literature. We herein describe two cases of retained foreign body during the laser ablation for varicose veins. One patient with varicose veins received laser therapy 5 years earlier, and had experienced discomfort and pain. After investigation, an overlooked sheath fragment was removed surgically from the leg. Another patient with varicose veins had discomfort after laser ablation for 8 days, and has been asymptomatic after the removal of the retained foreign body in the leg. The essential preventive approach include to pinpoint the site of the tip of fiberoptic laser fiber and pull 1 to 2 cm of the sheath out of the patient, then withdrawal the fiberoptic fiber and sheath simultaneously. A white flash light in the trunk of the fiberoptic laser fiber is an important warning signal of an erroneous manipulation during the operation. The surgeon should routinely check the intact sheath and fiberoptic fiber after laser ablation. In conclusion, retained foreign body can be prevented by following some practical tips during laser ablation.
What Clinical Factors Affect Length of Transition to Psoriatic Arthritis in Patients With Psoriasis?
Authors: Cheemalavagu Shashank , Jin Yuxuan , Husni M. Elaine
Published: June 2024

Objective

We aimed to identify clinical and demographic features associated with the interval between psoriasis (PsO) and psoriatic arthritis (PsA).

Methods

We identified patients with PsO and PsA diagnoses from our tertiary care psoriatic disease biorepository: a longitudinal, real‐world database including clinical information and patient‐reported outcomes. We used a multivariable a zero‐inflated negative binomial model to evaluate several clinical and demographic features that may be associated with the time between PsO and PsA onset.

Results

A total of 384 patients were included, of whom 52.2% were female. The mean age of PsO onset was 31.5 years. Advanced age at PsO onset was associated with a shorter interval between PsO and PsA. Based on our model, patients with PsO onset at age 42.6 years (upper end of the interquartile range [IQR]) had a 62% shorter expected interval compared with patients with PsO onset at age 18.9 years (lower end of IQR) (P < 0.001) and were more likely to have concurrent (onset within 6 months) diagnoses (odds ratio 4.56; 95% confidence interval 2.9–7.17). Patients with a body mass index (BMI) of 34 compared with a BMI of 26 had a 10% shorter interval between PsO and PsA, which trended toward statistical significance (P = 0.053).

Conclusion

Our study demonstrated that patients with a diagnosis of PsO at an older age have a shorter interval between PsO and PsA diagnoses and are more likely to have concurrent diagnoses compared with patients with an onset of PsO at a younger age. These results suggest that patients with a later onset of PsO may benefit from earlier PsA screening.
Magnetic Resonance Imaging Topography of Bone Marrow Edema in the Sacroiliac Joint of Postpartum Women
Authors: Kiil Rosa Marie , Weber Ulrich , Jurik Anne Grethe
Published: June 2024

Objective

A traditional monoplanar semicoronal and a biplanar magnetic resonance imaging (MRI) assessment method were used to compare the topographical distribution of postpartum strain‐related bone marrow edema (BME) at the sacroiliac joint (SIJ).

Methods

The presence and topographical location of SIJ BME were assessed independently by three readers in 71 women 12 months postpartum. A traditional monoplanar semicoronal and a biplanar BME evaluation by 8 (upper and lower) and 12 joint (upper, middle, and lower) regions, respectively, was performed with >4 weeks between the two assessments. Descriptive results were reported as mean ± SD and ranges, and interreader agreement by intraclass correlation coefficient (ICC).

Results

By semicoronal assessment, 38 (53.5%) women had BME with a mean ± SD SPARCC score of 2.3 ± 4.0 (range 0–22; ICC 0.93, 95% confidence interval [CI] 0.92–0.94). Forty‐one (57.8%) had BME by biplanar assessment with a mean ± SD sum score of 2.9 ± 5.8 (range 0–32.7; ICC 0.89, 95% CI 0.88–0.91). By semicoronal assessment, the highest frequency and mean SPARCC scores were in the anterior upper regions of ilium (24%, mean 0.6) and sacrum (21%, mean 0.3) followed by the posterior upper sacral (20%, mean 0.4) and posterior lower iliac (20%, mean 0.3) regions. By biplanar assessment, the anterior middle joint regions had highest BME frequency and sum scores, sacral side (32%, mean 1.9) and iliac side (27%, mean 2.0), respectively; frequencies and sum scores were generally higher in the anterior compared to the posterior joint regions.

Conclusion

The 12‐region biplanar assessment revealed a predominantly anterior middle location of postpartum SIJ BME whereas the 8‐region monoplanar approach did not demarcate distinct strain‐prone SIJ regions. Complementing traditional monoplanar semicoronal SIJ MRI evaluation by a semiaxial assessment may facilitate discrimination of strain‐related conditions from early axial spondyloarthritis.
Iterative parameter identification for Hammerstein systems with ARMA noises by using the filtering identification idea
Authors: Bedoui Saida , Abderrahim Kamel , Ding Feng
Published: June 2024

In practical applications, many processes have nonlinear characteristics that require nonlinear models for accurate description. However, constructing such models and determining their parameters are a challenging task. This article explores filtered identification methods for estimating the parameters of a particular type of nonlinear Hammerstein systems with ARMA noise. An auxiliary model‐based least squares algorithm is developed for such systems based on the auxiliary model identification idea. A hierarchical least squares algorithm that utilizes the hierarchical identification principle is proposed to enhance computational efficiency. Additionally, a key term separation technique is employed to express the system output as a linear combination of parameters, allowing the system to be decomposed into smaller subsystems for more efficient estimation of parameters. Simulation results demonstrate the effectiveness of these proposed algorithms.
Transforming an Ionic Conductor into an Electronic Conductor via Crystallization: In Situ Evolution of Transference Numbers and Structure in (La,Sr)(Ga,Fe)O3‐x Perovskite Thin Films
Authors: Buckner Haley B. , Simpson‐Gomez Joshua , Bonkowski Alexander , Rübartsch Kathrin , Zhou Hua , De Souza Roger A. , Perry Nicola H.
Published: June 2024

Mixed‐conducting perovskites are workhorse electrochemically active materials, but typical high‐temperature processing compromises their catalytic activity and chemo‐mechanical integrity. Low‐temperature pulsed laser deposition of amorphous films plus mild thermal annealing is an emerging route to form homogeneous mixed conductors with exceptional catalytic activity, but little is known about the evolution of the oxide‐ion transport and transference numbers during crystallization. Here the coupled evolution of ionic and electronic transport behavior and structure in room‐temperature‐grown amorphous (La,Sr)(Ga,Fe)O3‐x films as they crystallize is explored.
In situ ac‐impedance spectroscopy with and without blocking electrodes, simultaneous capturingsynchrotron‐grazing‐incidence X‐ray diffraction, dc polarization, transmission electron microscopy, and molecular dynamics simulations are combined to evaluate isothermal and non‐isothermal crystallization effects and the role of grain boundaries on transference numbers. Ionic conductivity increases by ≈2 orders of magnitude during crystallization, with even larger increases in electronic conductivity. Consequently, as crystallinity increases, LSGF transitions from a predominantly ionic conductor to a predominantly electronic conductor. The roles of evolving lattice structural order, microstructure, and defect chemistry are examined. Grain boundaries appear relatively nonblocking electronically but significantly blocking ionically. The results demonstrate that ionic transference numbers can be tailored over a wide range by tuning crystallinity and microstructure without having to change the cation composition.
Microwave Assisted Ultrafast, Selective Lithium Extraction in Deep Eutectic Solvent for LIB Cathode Recycling
Authors: Alhashim Salma H. , Bhattacharyya Sohini , Ajayan Pulickel M
Published: June 2024

The exponential rise in the use of LIBs raises concerns over the supply chain of critical metals, e.g., Li, Co, and Ni, used in their cathodes. Deep Eutectic Solvents (DES) are considered as green lixiviants for hydrometallurgical recycling of cathodes to recover these metals, although their efficiencies are still not at par with conventionally used harsh inorganic solvents. Here it is demonstrated that when assisted by microwave, a choline chloride (ChCl): ethylene glycol (EG) based DES shows ultrafast selective extraction of Li from different commercially used cathode compositions, with a leaching efficiency of >50% in just 30 s and nearly 100% in ≈ 30 min. The ultrafast selective Li leaching can be attributed to microwave irradiation‐induced preferential non‐thermal activation of the polar ChCl in the DES. The rapid microwave approach allows time and energy‐efficient recovery of Li and also prevents the degradation of DES, as is seen in conventional prolonged high‐temperature procedures, and is able to extract Li from high solid/liquid concentrations of LIB cathodes in DES.
Dynamic Response and Swift Recovery of Filament Heater‐Integrated Low‐Power Transparent CNT Gas Sensor
Authors: Chae Myoungsu , Lee Doowon , Kim Hee‐Dong
Published: June 2024

Designing a transparent carbon nanotube (CNT) gas sensor for nitrogen dioxide (NO2) detection at room temperature (RT), which is unaffected by humidity, is a critical challenge in various technologies. To solve this issue, a filament‐based memristor heater (MH) embedded low‐power CNT gas sensor is proposed to address humidity‐related issues, and dynamic response with a low power consumption of 6.15 µW and swift recovery of <1 ms/30.8 µW is successfully demonstrated, without any serious effects on humidity. This study reveals that the MH can effectively heat the surface of the active region due to the joule heating effect, which improves the absorption and desorption of the target gases and mitigates the influence on the humidity, which is in a response that is below 7.5%. As a result, it is believed that the proposed MH‐embedded transparent CNT gas sensors can address the humidity issues and slow response/recovery with ultralow‐power consumption and high‐accuracy gas sensing characteristics.
Mechanism of Antiferroelectricity in Polycrystalline ZrO2
Authors: Ganser Richard , Lomenzo Patrick D. , Collins Liam , Xu Bohan , Antunes Luis Azevedo , Mikolajick Thomas , Schroeder Uwe , Kersch Alfred
Published: June 2024

The size and electric field dependent induction of polarization in antiferroelectric ZrO2 is the key to several technological applications that are unimaginable a decade ago. However, the lack of a deeper understanding of the mechanism hinders progress. Molecular dynamics simulations of polycrystalline ZrO2, based on machine‐learned interatomic forces with near ab initio quality, shed light on the fundamental mechanism of the size effect on the transition fields. Stress in the oxygen sublattice is the most important factor. The so constructed interatomic forces allow the calculation of the transition fields as a function of the ZrO2 film thickness and predict the ferroelectricity at large thickness. The simulation results are validated with electrical and piezo response force microscopy measurements. The results allow a clear interpretation of the properties of the double‐hysteresis loops as well as the construction of the free energy landscape of ZrO2 grains.
Lasing‐Assisted Synthesis of Metal–Organic Frameworks (MOFs) and Its Application to Memory and Neuromorphic Devices
Authors: Han Seung Woo , Lee Chang Taek , Song Young‐Woong , Yoon Yeowon , Kwon Jang‐Yeon , Yang Lianqiao , Shin Moo Whan
Published: June 2024

Recently, metal–organic frameworks (MOFs) have gained attention in the field of electronics owing to their capability to tune their electrical characteristics. However, conventional methods for synthesizing MOFs pose challenges for their integration into electronic devices because of their long synthesis times and complex transfer steps. In this study, for the first time, lasing‐assisted synthesis (LAS) is used to rapidly and directly synthesize MOFs. These are applied to resistive random access memory (RRAM) devices. Using the LAS method, Cu(BDC) and Cu(BTC) are synthesized in a remarkably short time (≈5 min) and formed directly on metal substrates as thin films. This simplified their integration into RRAMs. The Cu(BDC)‐ and Cu(BTC)‐based RRAMs are evaluated for their potential in memory and neuromorphic applications. Both devices demonstrated nonvolatile memory capabilities with a remarkable data retention time of 104 s and long‐term plasticity (LTP) in response to voltage stimuli. However, the suitability of each device for a specific application varies depending on the type of MOFs used. The Cu(BTC)‐based RRAM is more suitable for memory applications because of its higher on/off ratio, longer endurance, and more data storage capacity. Conversely, Cu(BDC)‐based RRAM is highly effective in neural network simulation, achieving higher classification accuracy.
Elucidating the Microenvironment Structure‐Activity Relationship of Cu Single‐Site Catalysts via Unsaturated N,O‐Coordination for Singlet Oxygen Production
Authors: Li Pengfei , Deng Yang , Wang Haiyuan , Luo Yali , Che Yin , Bian Ruijuan , Gao Ruoyun , Wu Xianfeng , Zhang Zhen , Wu Xu
Published: June 2024

Understanding the microenvironment structure‐activity relationship of singlet‐atom catalysts (SACs) is imperative for the development of high‐performance photocatalytic devices. However, the challenge remains to finely regulate the coordination microenvironment of SACs. Herein, single‐atom Nx─Cu─O4‐x (x = 1–4) photocatalysts with different coordination environments are successfully prepared based on pre‐design reticular supramolecular covalent organic frameworks (COFs) for direct photocatalytic 1O2 production from O2. The results show that the high activity of Cu SACs is closely related to the N,O‐coordination microenvironment, which is primarily ascribed to the different electrophilicity of the N, O atom. The electron configuration of N3‐Cu‐O1 endows photocatalyst enhanced charge transfer capability and the nearest D‐band center to the Fermi level. The “end‐on” type adsorption configuration of O2 at the N3─Cu─O1 active site can promote the breaking of Cu─O bonds rather than O─O bonds. As a result, the N3‐Cu‐O1@COF photocatalyst exhibits the most optimal formation and desorption energies for intermediates •OOH, which provides an advantageous reaction pathway with fewer steps and a lower barrier for 1O2 production. This work highlights the structure‐activity relationship of SACs for long‐term applications.
Polyoxometalates: Cascading Functionality to Unique On‐Off Organic Photoelectrochemical Transistor Operation
Authors: Chen Feng‐Zao , Hou Lu , Gao Yuan , Zhou Jia‐Yi , Kong Fen‐Ying , Han De‐Man , Zhao Wei‐Wei
Published: June 2024

While existing polyoxometalates (POMs) are predominantly utilized in a range of energy devices, their potential in bioelectronics and optoelectronics, particularly in organic photoelectrochemical transistors (OPECTs), remains unexplored. Here, the potential of POMs in this aspect is unveiled by a POM/sulfide‐gated OPECT. The representative PW12/ZnIn2S4 with cascading light‐harvesting and enzyme‐like functionality enables unique on‐off OPECT operation. The incorporation of PW12 facilitates the separation of photogenerated charge carriers across the heterojunction interface, consequently inducing a pronounced gating effect. Linking with a CRISPR/Cas13a system correlating the target miRNA‐21 and biological generation of H2O2, the PW12 will enable the polymerization of dopamine into polydopamine and thus sensitively inhibit the OPECT gating. Experimental results demonstrated that the developed OPECT sensor achieved good analytical performance with a detection limit as low as 3.9 fm. This study demonstrates the potential of POMs in OPECT. Given the large family and multifunction of POMs, its implications in the diverse bioelectronics and optoelectronics are expected.
Nano‐Biointeractions of Functional Nanomaterials: The Emerging Role of Inter‐Organelle Contact Sites, Targeting, and Signaling
Authors: Blal Naym , Bardi Giuseppe , Pompa Pier Paolo , Guarnieri Daniela
Published: June 2024

The study of nano‐biointeractions, at the forefront of interdisciplinary research, unveils intricate interplays between nanomaterials (NMs) and intracellular organelles, which are pivotal hubs orchestrating diverse cellular processes. Thanks also to the formation of dynamic contacts among their membranes, organelles regulate lipid exchange, calcium signaling, and metabolic pathways. Recently, the potential role of NMs in cellular homeostasis through the regulation of organelle membrane contact sites (MCSs) is emerging, and a complete overview of this issue is still lacking. This perspective aims at elucidating the synergy between functional NMs and organelle contact site research, underscoring the pivotal role of NMs in advancing the comprehension of cell biology mechanisms and fostering therapeutic breakthroughs. This subject represents a crucial aspect of nano‐biointeractions, as it can reveal new molecular targets for NMs and potentially revolutionize therapeutic strategies. Nanotechnology may offer unprecedented tools to decipher and manipulate dynamic organelle interfaces with remarkable precision. Engineered nanomaterials may serve as versatile probes and effectors, enabling targeted modulation of organelle contact sites and unraveling the molecular intricacies governing organelle dynamics. Furthermore, nano‐biointeraction‐driven insights hold promise for therapeutic innovations, offering novel avenues in diseases linked to dysregulated organelle contacts.
A H₂S‐Evolving Alternately‐Catalytic Enzyme Bio‐Heterojunction with Antibacterial and Macrophage‐Reprogramming Activity for All‐Stage Infectious Wound Regeneration
Authors: He Miaomiao , Wang Zuyao , Xiang Danni , Sun Dan , Chan Yau Kai , Ren Huilin , Lin Zhijie , Yin Guangfu , Deng Yi , Yang Weizhong
Published: June 2024

The disorder of the macrophage phenotype and the hostile by‐product of lactate evoked by pathogenic infection in hypoxic deep wound inevitably lead to the stagnant skin regeneration. In this study, hydrogen sulfide (H2S)‐evolving alternately catalytic bio‐heterojunction enzyme (AC‐BioHJzyme) consisting of CuFe2S3 and lactate oxidase (LOD) named as CuFe2S3@LOD is developed. AC‐BioHJzyme exhibits circular enzyme‐mimetic antibacterial (EMA) activity and macrophage re‐rousing capability, which can be activated by near‐infrared‐II (NIR‐II) light. In this system, LOD exhausts lactate derived from bacterial anaerobic respiration and generated hydrogen peroxide (H2O2), which provides an abundant stock for the peroxidase‐mimetic activity to convert the produced H2O2 into germicidal •OH. The GPx‐mimetic activity endows AC‐BioHJzyme with a glutathione consumption property to block the antioxidant systems in bacterial metabolism, while the O2 provided by the CAT‐mimetic activity can generate 1O2 under the NIR‐II irradiation. Synchronously, the H2S gas liberated from CuFe2S3@LOD under the infectious micromilieu allows the reduction of Fe(III)/Cu(II) to Fe(II)/Cu(І), resulting in sustained circular EMA activity. In vitro and in vivo assays indicate that the CuFe2S3@LOD AC‐BioHJzyme significantly facilitates the infectious cutaneous regeneration by killing bacteria, facilitating epithelialization/collagen deposition, promoting angiogenesis, and reprogramming macrophages. This study provides a countermeasure for deep infectious wound healing via circular enzyme‐mimetic antibiosis and macrophage re‐rousing.
Strategies to Control Crystal Growth of Highly Ordered Rubrene Thin Films for Application in Organic Photodetectors
Authors: Hofmann Anna‐Lena , Wolansky Jakob , Hambsch Mike , Talnack Felix , Bittrich Eva , Winkler Lucy , Herzog Max , Zhang Tianyi , Antrack Tobias , Winkler L. Conrad , Schröder Jonas , Riede Moritz , Mannsfeld Stefan C.B. , Benduhn Johannes , Leo Karl
Published: June 2024

Organic semiconductors still lag behind their inorganic counterparts in terms of mobility due to their lower structural order, in particular in thin films. Here, the highly ordered phase of triclinic rubrene – characterized by high vertical hole mobility – grown from a vacuum‐deposited thin film is used by post‐annealing and implemented into organic photodetectors. Since the triclinic rubrene exhibits a high roughness with a peak‐to‐valley value of 250 nm, which is detrimental to the dark current, strategies to control the crystal growth are developed. These investigations show that a suppression layer of 20 nm C60 is the most promising approach to successfully reduce the surface roughness while maintaining the triclinic phase, proven by grazing‐incidence wide‐angle X‐ray scattering (GIWAXS). With the smoothened active layer, the dark current density is reduced by three orders of magnitude compared to the neat rubrene layer. It is as low as 2.5 × 10−10 A cm−2 at −0.1 V bias, reflected in an overall specific detectivity of 6 × 1011 Jones at zero bias (based on noise measurements) and a high linear dynamic range of 170 dB. This strategy using a suppression layer thus proves successful and is very promising to be applied to other crystalline materials.
Universal Enhancement Effect of Nonlinear Optical Response from Band Hybridization
Authors: Lai Junwen , Zhan Jie , Liu Peitao , Shirakawa Tomonori , Seiji Yunoki , Chen Xing‐Qiu , Sun Yan
Published: June 2024

Bulk photovoltaic effect, i.e. shift current, is a nonlinear second‐order optical response that can rectify an alternating current (AC) electric field into a direct current (DC). Depending on the wavelength of the incident light, shift current finds applications in various fields, including solar energy conversion and radiation detection. Its promising application in energy conversion and information processing has inspired investigations to uncover the relationship between shift current and electronic structures of materials. Despite numerous efforts dedicated to designing principles for strong bulk photovoltaic effect materials, the only widely accepted crucial parameter is the joint density of states (JDOS). In this study, employing effective model analysis and first‐principles calculations, an enhancement effect of bulk photovoltaic effect is found to arise from band hybridization that is typically along with anti‐crossing‐like electronic band structures, similar to the Berry curvature effects in intrinsic anomalous Hall conductivity. While this mechanism does not offer a comprehensive understanding of the relationship between electronic structure and the magnitude of bulk photovoltaic effect, it represents practical progress in the design of materials with strong bulk photovoltaic effect.
Integrated Optical Microrings on Fiber Facet for Broadband Ultrasound Detection
Authors: Sun Jialve , Hou Feiyang , Feng Shengfei , Li Changhui
Published: June 2024

The miniature optical fiber ultrasound sensor with high sensitivity and bandwidth is important for the field of ultrasonic detection. In this study, a unique fiber ultrasound sensor via integrating optical microrings on a multicore fiber facet is reported. The results demonstrate this sensor can be used in liquid environment and has high sensitivity with broadband bandwidth. The detector's equivalent noise pressure (NEP) can reach 13.2 mPa Hz−1/2 with a broadband ultrasound response over 250 MHz (103 MHz in −6 dB). Besides, this sensor is resistant to environmental impurities. The sensor is successfully applied to photoacoustic microscopy (PAM) with a lateral resolution of 5 µm and an axial resolution of 6.6 µm. Furthermore, an integrated transceiver structure for ultrasound/photoacoustic detection is proposed, which has great application prospects for using in constrained tiny spaces, such as endoscopy, or closely scanning over uneven surfaces.
Study on the Oxygen Partial Pressure Dependent Annealing Effect for SiO2/SiC Stack
Authors: Zhang Qian , You Nannan , Wang Jiayi , Xu Yang , Zhang Kuo , Wang Shengkai
Published: June 2024

Post‐oxidation annealing in oxygen (O2) ambient can improve the quality of the SiO2/SiC stack without introducing foreign atoms. In order to reveal the annealing mechanism at different oxygen partial pressures (P(O2)), this work focuses on the dependence of the annealing effect on P(O2) in a wide range from 0.01 Pa to 101 kPa for SiO2/SiC stack. In order to minimize the C‐related defects generated during SiC oxidation, the SiO2/SiC stacks are formed by oxidizing the deposited Si on the SiC epitaxial layer. The electrical characteristics of the annealed samples show that low P(O2) is beneficial to improve the interface quality, and high P(O2) is beneficial to improve the oxide layer quality. In addition, time of flight secondary ion mass spectrometry and X‐ray photoelectron spectroscopy analysis shows that the distribution and filling of oxygen vacancies (V[O]) are consistent with the electrical results. Finally, a model describing V[O] filling amount with P(O2) is proposed to quantitatively characterize the dependence of the annealing effect on P(O2), which shows that the filling amount of V[O] is proportional to P(O2)n (n∼0.065). This model provides theoretical support for improving the quality of SiC MOS by O2 annealing.
Inkjet‐Printed Phase Change Memory Devices
Authors: He Hanglin , Kumaar Dhananjeya , Portner Kevin , Zellweger Till , Schenk Florian M. , Wintersteller Simon , Vlnieska Vitor , Emboras Alexandros , Wood Vanessa , Yarema Maksym
Published: June 2024

Phase change memory (PCM) is among the most promising candidates for the next generation of storage‐class and main memory systems in the computing era beyond Moore's law. However, the widespread installment of PCM devices is limited by the high price‐per‐bit and complex fabrication process. In this paper, it is shown that functional PCM memory devices can be printed, proving low‐cost avenues for non‐silicon memory technologies. Taking Ge‐Sb‐Te (GST) as a case study, PCM inks are prepared and optimize their structural, rheological, and printing parameters. GST layers are then printed onto PCM devices in the planar configuration, showing excellent performance, such as non‐volatility, resistivity contrast, low cycle‐to‐cycle variability, and endurance of at least 100 cycles. This paper provides a novel approach to liquid‐based engineered PCM devices through inkjet printing, enabling patterned memory layers, lower price‐per‐bit, and customizable multi‐material PCM arrays.
Strain Driven Electrical Bandgap Tuning of Atomically Thin WSe2
Authors: Islam Md Akibul , Nicholson Eric , Barri Nima , Onodera Momoko , Starkov Danny , Serles Peter , He Shuo , Kumral Boran , Zavabeti Ali , Shahsa Haleh , Cui Teng , Wang Guorui , Machida Tomoki , Singh C.V. , Filleter Tobin
Published: June 2024

Tuning electrical properties of 2D materials through mechanical strain has predominantly focused on n‐type 2D materials like MoS2 and WS2, while p‐type 2D materials such as WSe2 remain relatively unexplored. Here, the impact of controlled mechanical strain on the electron transport characteristics of both mono and bi‐layer WSe2 is studied. Through coupling atomic force microscopy (AFM) nanoindentation techniques and conductive AFM, the ability to finely tune the electronic band structure of WSe2 is demonstrated. The research offers valuable mechanistic insights into understanding how WSe2's electronic properties respond to mechanical strain, a critical prerequisite for the development of flexible photoelectronic devices. It is also observed that under high pressure, the AFM tip/monolayer WSe2/metal substrate junction transitions from Schottky to Ohmic contact, attributed to significant charge injection from the substrate to the WSe2. These findings are significant for designing efficient metal/semiconductor contact in thin and flexible PMOS (p‐type Metal–Oxide–Semiconductor) devices.
Enhancement of Thermal Boundary Conductance between MoS2 and Dielectric Layer by Self‐Assembled Monolayers
Authors: Huang Jian , Yu Xiaotong , Wang Xiaofeng , Wang Fanfan , Liu Zexin , Yang Kai , Yue Yue , Li Kangyong , Dai Ruiwen , Lin Aming , Sun Yiyang , Zhao Tianlong , Wang Zhiqiang , Gao Yuan , Zhang Lifu , Chen Dongdong , Xin Guoqing
Published: June 2024

The 2D semiconductor monolayer MoS2 is expected to be a potential channel material to achieve higher miniaturization and integration in post‐Moore era due to its exceptional electrical and optical properties. However, the weak van der Waals interaction between MoS2 and the dielectric substrate induces high interfacial thermal resistance and impedes the heat dissipation, leading to significant temperature rise and consequential device performance degradation. Here, self‐assembled monolayers (SAM) are employed to modify the surface of dielectric SiO2 and enhance thermal boundary conductance (TBC) between MoS2 and dielectric layer. The surface roughness of dielectric SiO2 is improved by the SAM, depressing the photon scattering. More importantly, the interfacial bonding force is strengthened by the formation of chemical covalent N‐Mo bonds between NH2‐terminated SAM and MoS2, thus leading to a 118% TBC improvement between MoS2 and NH2‐terminated SiO2 compared to pristine SiO2 substrate. Simultaneously, the current reduction caused by self‐heating effect in the monolayer MoS2 field‐effect transistor is eliminated and the maximum power density of the device is largely improved. The incorporation of SAM in 2D semiconductor nanoelectronics presents great potential for device thermal management and reliability improvement.
Reformulation of dicamba herbicide: Impacts on offsite transport and soybean damage
Authors: Hammer Caleb R. , Griffis Timothy J. , Baker John M. , Rice Pamela J. , Frankson Lara E. , Gunsolus Jeffrey L. , Erickson Matthew D. , Xiao Ke , Mistry Aarti P. , Sarangi Debalin
Published: June 2024

The herbicide dicamba (3,6‐dichloro‐2‐methoxybenzoic acid) is commonly used to control broadleaf weeds in soybeans. Dicamba, however, is susceptible to volatilization and drift, thereby causing significant plant damage to nontarget crops downwind. Dicamba was reformulated to reduce volatility and off‐target movement. The effectiveness of the dicamba reformulation was assessed by quantifying dicamba emissions following spray application and investigated how meteorological factors influenced the off‐target movement. The experiments were conducted at the University of Minnesota Agricultural Experiment Station (UMORE Park) during the growing season of 2018, 2019, 2021, and 2022. Multiple high‐flow polyurethane foam air samplers were used to measure dicamba concentrations downwind from a 4‐ha soybean field sprayed with dicamba. Dicamba emissions were estimated using backward Lagrangian modeling constrained by the air sample observations. The results indicate that dicamba emissions and downwind transport were significant for several days following application. Further, non‐traited soybeans located within 15–45 m showed substantial dicamba‐related damage. In warmer, drier seasons, increased dicamba emissions caused more severe damage to downwind soybeans, likely worsened by drought stress preventing recovery. Favorable atmospheric conditions that reduced potential drift can be difficult to achieve in terms of the typical weather experienced over agricultural sites in the Upper Midwest. These results indicate that the dicamba reformulation has not adequately prevented significant post‐spray volatilization losses and downwind transport.