National Institute of Metrology

Turnkey Soliton Microcombs via Self‐Injection Locking in Dual‐Coupled and Interferometric Microring Systems

ABSTRACT This study systematically investigates, via numerical simulations, the self‐injection locking (SIL) characteristics of dual‐ring coupled cavity systems and interferometric microring systems. For the dual‐ring system, we show that the SIL region on the tuning curve splits...

A nuclear clock synchronized to 229Th

Abstract Atomic clocks have made time and frequency the most precisely measured quantities in physics, progressing from microwave standards that realize the SI second 1 to optical clocks with unprecedented precision 2 . A nuclear clock transfers the frequency reference from an el...

Real‐Time Observation of Soliton Buildup and Self‐Organization in a GHz Harmonic Mode Locked Fiber Laser

ABSTRACT Ultrafast fiber lasers operating at GHz repetition rates are critical for applications requiring high‐speed optical pulse sources. To achieve such rates, passive harmonic mode locking (HML) constitutes a logical pathway, whose practical implementation is hampered by the...

Outer Surface Functionalized Graphene Oxide Nanofluidic Platform for Selective Detection of Insect Pheromones

Abstract Invasive insects inflict severe ecological and economic damage, creating an urgent need for rapid and early detection strategies. Here, we present a biomimetic strategy that replicates the molecular recognition principles of insect olfaction. As a proof of concept, our p...

Common-Garden Transcriptomes Distinguish Leaf-Form-Associated from Site-Associated Expression in Zygophyllum xanthoxylum

Zygophyllum xanthoxylum (Bunge) Maxim. is a dominant, deep-rooted shrub of the temperate deserts of north-western China whose leaflets range from comparatively flat and broad to slender and terete, but the molecular basis of this variation has rarely been reported. We compared th...

Microbial Bioenergetics and Ecology Govern the Coupled Biogeochemical Cycling of Arsenic/Antimony and Macronutrients

Abstract Arsenic (As) and antimony (Sb) are toxic metalloids whose biogeochemical cycles are strongly influenced by carbon (C), nitrogen (N), and sulfur (S) through microbially mediated coupled transformations. However, the mechanistic basis of these coupled processes remains poo...

Filling the gaps in high-priority reference materials for implementing metrological traceability in laboratory medicine

Abstract The global harmonization of measurements in laboratory medicine is facilitated by the development and implementation of reference measurement systems, including suitable certified reference materials (CRMs). There are, however, a relatively small number of CRM producers...

A Graded Evaluation Method for Construction Quality of Prefabricated Beam Bridges Based on Manifold Learning and Probability Distributions

This study aims to construct a graded evaluation method for the construction quality of Highway Prefabricated Beam Bridges, in order to support refined quality control beyond the traditional “qualified/unqualified” judgment. Existing evaluation methods have difficulty effectively...

An Environmental Monitoring CO2 Sensor Based on LLZO Solid Electrolyte Film and WC – Li2CO3 Auxiliary Phase

As the requirements for information accuracy in various application fields continue to increase, the grid-based deployment of CO2 sensors is playing an increasingly crucial role in air quality monitoring, agricultural intelligent regulation, and climate change research. For large...

Assessing the Fitness-for-Purpose of Published Breath Analysis Data: A Quality Assessment Framework for Diabetes Biomarker Research

Abstract Background Exhaled breath analysis is a promising field for non-invasive diabetes diagnostics, but its clinical translation is hindered by contradictory findings across studies. We argue that this inconsistency stems from significant methodological heterogeneity and the...

Diagnosing year-round ozone-relevant VOC reactivity under meteorological constraints in urban Beijing

Abstract Static volatile organic compound (VOC) rankings can identify abundant or reactive compounds, but their ozone relevance depends on the meteorological and photochemical state during ozone production. Here we combine yearlong hourly observations of speciated VOCs in urban B...

A roadmap for standardization of serum albumin measurements

Abstract Albumin measurements in serum have important diagnostic and prognostic roles. However, non-standardized measurement procedures are still used in medical laboratories. An agreed approach for the implementation of metrological traceability to the International System of Un...

FacilitatingJ-Aggregate Formation by LoweringActivation Energy to Achieve Ultrahigh Brightness for NIR-II FluorescenceImaging and Photoacoustic Imaging

Abstract Organic fluorophores operating in the second near-infrared window (NIR-II, 900–1700 nm) are plagued by low quantum yields (QYs) and diminished brightness in aqueous media. To address this challenge, we proposed a strategy of regulating the activation energy for aggregate...