Browse Articles

Author Correction: Global subsidence of river deltas

Interfacial Adsorbate Competition Regulates Intermediate Stabilization and Onset Potential in Acidic CO ₂ Electroreduction

A dual-band four-port MIMO antenna with a partial ground plane for n257/n260/n261 band applications

Abstract In this paper, a compact four-port dual-band multiple-input-multiple-output (MIMO) antenna is designed and developed for fifth-generation (5G) millimeter-wave applications. The proposed antenna operates in the n257 band at 28 GHz and the n260/n261 bands at 38 GHz within the 5G new radio (NR) frequency range-2 (FR2) spectrum, thereby supporting enhanced data rates, high capacity, and low-latency applications. The dual-band unit element of the proposed 4-port MIMO antenna consists of a modified rectangular patch antenna with a partial ground plane. The modified patch structure is obtained by loading a microstrip-fed rectangular patch with H-shaped and inverted T-shaped slots. The unit elements are placed orthogonally to each other, and they are interconnected at the center via extended stubs. The designed dual-band MIMO antenna has an overall volume of 28 mm × 28 mm × 0.254 mm, which is approximately $$0.161{\varvec{\lambda}}_{0}^{3}$$ , where $${\varvec{\lambda}}_{0}$$ corresponds to the operating wavelength at 28 GHz. The designed MIMO antenna operates at 27.26–29.90 GHz and 37.57–40.29 GHz, which fall within the n257/n261 and n260 bands of the 5G NR FR2 spectrum, with inter-port isolation better than 20 dB across both bands. The proposed antenna system demonstrates excellent MIMO performance, validating its ability to support reliable, high-capacity, and low-latency communication, making it a strong candidate for next-generation 5G millimeter-wave applications .

Continuous, Week-Long, Seconds-Resolved <i>In Vivo</i> Drug Measurements Performed with a Xenonucleic Acid-Employing Electrochemical, Aptamer-Based Sensor

S2SWCLIP: semantic-optimized prompts with spatial-wavelet synergy for zero-shot anomaly detection

Dense Platinum-Based Intermetallic Nanoparticles Confined into Hollow Mesoporous Carbon for Durable High-Power Heavy-Duty Fuel Cells

Trajectory matrix-guided optimal design of non-circular gear train seedling throwing mechanism for rice pot seedlings

Programmable Pore Environments in Multivariate ZIF Membranes for Ultra-Selective Helium Recovery from Natural Gas

A comparative analysis of gamma and neutron radiation shielding properties of Gd2O3 nanoparticles within HDPE composites irradiated with argon ion beam

Abstract Gd 2 O 3 /HDPE nanocomposite materials were prepared using the sol-gel method. These composites were developed to investigate the gamma-ray and neutron shielding properties of HDPE reinforced with Gd 2 O 3 nanoparticles at different concentrations (x = 4.0%, 12.0%, 20.0%, 30.0%, and 40%). The study also investigates the effects of argon ion irradiation on the gamma-ray and neutron shielding properties. The composite was irradiated with argon ion beam of energy 4 keV, to a fluence of 22 × 10 16 ions/cm 2 . Different analytical techniques were applied to study the Gd 2 O 3 /HDPE nanocomposites. The mass attenuation coefficient (µ m ) was experimentally measured using the Eu-152 gamma point source. The HPGe detector was used for measurement of shielding parameters of unirradiated and irradiated composites. The (µ m ) was measured at different photon energies, and the outcomes have been contrasted with those obtained utilizing the NIST-XCOM software. There was an acceptable agreement between the theoretical and experimental results. For example, at 121 keV, the attenuation parameter increases from 0.1845 for pure HDPE to 0.5065 for the 30 wt% Gd 2 O 3 /HDPE composite, corresponding to an enhancement of approximately 175%. Also, total neutron macroscopic cross-sections were evaluated for both irradiated and unirradiated samples. Results revealed a significant enhancement in gamma and neutron attenuation post-irradiation, attributed to structural, mechanical, and morphological changes induced by the ion beam. For pure HDPE, Ʃ T increases by 33%, whereas the 12 wt% and 20 wt% Gd 2 O 3 /HDPE composites exhibit further enhancements of approximately 82% and 70%, respectively. The findings indicate ion treatment provides a promising method for improving radiation shielding parameters of polymer nanocomposites.

Redox- and Protonation-Tunable Diboraheptacenes

A multi-scenario identification of key ecological restoration areas integrating ecosystem service value and landscape risk in the northern Qinling foothills

A Stable, NH-Containing Chiral Nanographene: An Electroactive N-Doped π-System for Chiroptics and Spin-Selective Transport

Phenome-wide study connects behavioral genetics of odor detection dogs with temperament traits

In-situ efficiency and parameter estimation for induction motors using heuristic optimization

Genomic characterization of multidrug-resistant Escherichia coli strains identified from patients with urinary tract infection in Egypt

Abstract Extended-spectrum β-lactamases-producing Escherichia coli (ESBL-EC) pose a serious threat. Moreover, widespread antimicrobial use in Egypt increased the prevalence of antimicrobial resistance (AMR). In this study, whole-genome sequencing (WGS) using the Illumina NovaSeq 6000 was performed on two isolates (UPE7 and UPE139) recovered from participants with urinary tract infections to characterize their resistomes and virulomes. Antibiotic resistance and virulence genes of the two clinical E. coli strains were predicted using computational analysis tools. Several virulence traits and antibiotic resistance genes (ARGs) were identified. Strain UPE7 harbored bla TEM−1B , bla CTM−X−15, bla CMY−2 , and strain UPE139 revealed the presence of bla OXA−244 , bla TEM−12 , bla TEM−82 , and bla CTM−X−15 rending the resistance phenotype. The presence of mobile genetic elements adjacent to ARGs thereby suggests their potential for dissemination through horizontal gene transfer. Furthermore, the serotyping in silico investigation revealed that E. coli UPE7 and UPE139 serotypes were O8:H9 and O9:H30, respectively. Notably, key mutations in the gyrA , parC , and parE genes were predicted, consistent with their confirmed resistance to levofloxacin. These findings emphasize the importance of genomic surveillance to guide antimicrobial therapy and monitor emerging high-risk clones, and they support the need for larger-scale genomic studies to improve epidemiological understanding and clinical relevance.

pH Controls Charge Localization in Redox-Active Ladder Polymers

Processed plant-based meat-supplemented diet versus red meat-based supplemented diet randomized cross-over trial Finding Optimal Oral Diet-1 (FOOD-1) trial

Conductive Two-Dimensional Metal–Organic Frameworks Connected through Metal <i>N</i> -Heterocyclic Carbene Complexes

Machine learning-based prediction and identification of determinants of teenage pregnancy in ten East African countries

Interfacial Brønsted Acid Site Architectures on Amorphous Silica–Alumina Resolved by Heteronuclear-Filtered Two-Dimensional Solid-State NMR Correlation Spectroscopy