M. W. Kwok
A5077031425- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Pickering emulsions and particle stabilization
- Proteins in Food Systems
- Advanced Materials and Mechanics
- Liquid Crystal Research Advancements
- Hydrogels: synthesis, properties, applications
- Dark Matter and Cosmic Phenomena
- Surfactants and Colloidal Systems
- Advanced Sensor and Energy Harvesting Materials
- Dielectric materials and actuators
- Muon and positron interactions and applications
- Diamond and Carbon-based Materials Research
- Micro and Nano Robotics
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Temporomandibular Joint Disorders
- Radiation Detection and Scintillator Technologies
- Orthodontics and Dentofacial Orthopedics
- Advanced Surface Polishing Techniques
- Synthesis and Properties of Aromatic Compounds
- Dental materials and restorations
- Polymer Nanocomposites and Properties
- 3D Printing in Biomedical Research
Chinese University of Hong Kong
2012-2025
Case Western Reserve University
2019-2023
Charles University
2012
University of Hong Kong
2012
The Daya Bay Reactor Neutrino Experiment has measured a nonzero value for the neutrino mixing angle ${\ensuremath{\theta}}_{13}$ with significance of 5.2 standard deviations. Antineutrinos from six 2.9 $\mathrm{G}{\mathrm{W}}_{\mathrm{th}}$ reactors were detected in antineutrino detectors deployed two near (flux-weighted baseline 470 m and 576 m) one far (1648 underground experimental halls. With $43\text{ }000\text{ }\text{ }\mathrm{ton}--\mathrm{G}{\mathrm{W}}_{\mathrm{th}}--\mathrm{day}$...
A measurement of the energy dependence antineutrino disappearance at Daya Bay reactor neutrino experiment is reported. Electron antineutrinos (ν¯(e)) from six 2.9 GW(th) reactors were detected with detectors deployed in two near (effective baselines 512 and 561 m) one far (1579 underground experimental halls. Using 217 days data, 41 589 (203 809 92 912) candidates hall (near halls). An improved oscillation amplitude sin(2)2θ(13)=0.090(-0.009)(+0.008) first direct ν¯(e) mass-squared...
We report an improved measurement of the neutrino mixing angle $\theta_{13}$ from Daya Bay Reactor Neutrino Experiment. exclude a zero value for $\sin^22\theta_{13}$ with significance 7.7 standard deviations. Electron antineutrinos six reactors 2.9 GW$_{\rm th}$ were detected in antineutrino detectors deployed two near (flux-weighted baselines 470 m and 576 m) one far (1648 underground experimental halls. Using 139 days data, 28909 (205308) electron candidates at hall (near halls). The ratio...
This Letter reports a measurement of the flux and energy spectrum electron antineutrinos from six 2.9~GW$_{th}$ nuclear reactors with detectors deployed in two near (effective baselines 512~m 561~m) one far (1,579~m) underground experimental halls Daya Bay experiment. Using 217 days data, 296,721 41,589 inverse beta decay (IBD) candidates were detected halls, respectively. The measured IBD yield is (1.55 $\pm$ 0.04) $\times$ 10$^{-18}$~cm$^2$/GW/day or (5.92 0.14) 10$^{-43}$~cm$^2$/fission....
We report a new measurement of electron antineutrino disappearance using the fully constructed Daya Bay Reactor Neutrino Experiment. The final two eight detectors were installed in summer 2012. Including 404 days data collected from October 2012 to November 2013 resulted total exposure 6.9×10^{5} GW_{th} ton days, 3.6 times increase over our previous results. Improvements energy calibration limited variations between 0.2%. Removal six ^{241}Am-^{13}C radioactive sources reduced background by...
The Daya Bay Collaboration reports precise measurements of the ${\ensuremath{\theta}}_{13}$ neutrino mixing angle and predicts $\mathrm{\ensuremath{\Delta}}\phantom{\rule{0}{0ex}}{m}_{32}^{2}$ mass difference for both normal inverted hierarchy scenarios. These values are based on comparing detection antineutrinos by ''near'' ''far'' detectors more than 2.5 million inverse beta-decay observations.
The Daya Bay experiment has observed correlations between reactor core fuel evolution and changes in the antineutrino flux energy spectrum. Four detectors two experimental halls were used to identify 2.2 million inverse beta decays (IBDs) over 1230 days spanning multiple cycles for each of six 2.9 GW$_{\textrm{th}}$ cores at Ling Ao nuclear power plants. Using detector data effective $^{239}$Pu fission fractions, $F_{239}$, from 0.25 0.35, measures an average IBD yield, $\bar{\sigma}_f$,...
A new measurement of the reactor antineutrino flux and energy spectrum by Daya Bay neutrino experiment is reported. The antineutrinos were generated six 2.9~GW$_{\mathrm{th}}$ nuclear reactors detected eight detectors deployed in two near (560~m 600~m flux-weighted baselines) one far (1640~m baseline) underground experimental halls. With 621 days data, more than 1.2 million inverse beta decay (IBD) candidates detected. IBD yield was measured, ratio measured to predicted found be...
For the first time, sulfonylated polymers of intrinsic microporosity (PIMs) are exploited for high-<italic>κ</italic>, high-temperature, and low-loss gate dielectric applications.
A search for light sterile neutrino mixing was performed with the first 217 days of data from Daya Bay Reactor Antineutrino Experiment. The experiment's unique configuration multiple baselines six 2.9~GW$_{\rm th}$ nuclear reactors to antineutrino detectors deployed in two near (effective 512~m and 561~m) one far (1579~m) underground experimental halls makes it possible test oscillations a fourth (sterile) $10^{\rm -3}~{\rm eV}^{2} < |\Delta m_{41}^{2}| 0.3~{\rm eV}^{2}$ range. relative...
This Letter reports an improved search for light sterile neutrino mixing in the electron antineutrino disappearance channel with full configuration of Daya Bay Reactor Neutrino Experiment. With additional 404 days data collected eight detectors, this benefits from 3.6 times statistics available to previous publication, as well improvements energy calibration and background reduction. A relative comparison rate spectrum reactor antineutrinos three experimental halls yields no evidence...
The use of soft microgel particles for stabilizing emulsions has captured increasing attention across a wide range disciplines in the past decades. Being soft, nanoparticles, which are spherical solution, undergo structure change when adsorbed at oil–water interface. This morphology leads to special dynamic properties interface layers and packing structures, then alter interfacial tension rheological In addition, stabilized by these particles, known as Pickering emulsions, can be triggered...
Diamond nitrogen-vacancy (NV) center-based magnetometry provides a unique opportunity for quantum bio-sensing. However, NV centers are not sensitive to parameters such as temperature and pressure, immune many biochemical pH non-magnetic biomolecules. Here, we propose scheme that can potentially enable the measurement of various using diamond sensing, by employing stimulus-responsive hydrogels spacing transducer in-between nanodiamond (ND, with centers) magnetic nanoparticles (MNPs). The...
This Article presents the controlling synthesis and characterization of micrometer-sized, multiresponsive poly(N-isopropylacrylamide-co-methacrylic acid) (PNIPAM-MAA) microgel particles. By combining semibatch temperature-programmed surfactant-free precipitation polymerization, we have successfully developed a novel approach to preparation temperature- pH-responsive PNIPAM microgels with dense-shell (DS), dense-core (DC), or homogeneous (HOMO) structure. We then investigated interaction...
A new measurement of the ${\ensuremath{\theta}}_{13}$ mixing angle has been obtained at Daya Bay Reactor Neutrino Experiment via detection inverse beta decays tagged by neutron capture on hydrogen. The antineutrino events for hydrogen are distinct from those gadolinium with largely different systematic uncertainties, allowing a determination independent gadolinium-capture result and an improvement precision measurement. With 217-day data set six detectors $2.9\text{...
The Daya Bay Experiment consists of eight identically designed detectors located in three underground experimental halls named as EH1, EH2, EH3, with 250, 265 and 860 meters water equivalent vertical overburden, respectively. Cosmic muon events have been recorded over a two-year period. rate is observed to be positively correlated the effective atmospheric temperature follow seasonal modulation pattern. correlation coefficient $\alpha$, describing how variation relates temperature, found...
For liquid crystals (LCs) and crystalline polymers (LCPs), a chiral smectic C (SmC*) phase has been mandatory for breaking the symmetry achieving ferroelectricity. However, this SmC* leads to rather low spontaneous polarization (Ps, 0.1-5 mC/m2), which limited their usage in various electronic electro-optical applications. In mini-review, we highlight three new types of ferroelectric LCPs with high Ps values reported last decade. The first system refers nematic LCs LCPs. large dipole moment...
The Daya Bay collaboration, with all eight of its anti-neutrino detectors functioning, returns to measuring the neutrino mixing angle ${\ensuremath{\theta}}_{13}$ through hydrogen capture neutrons produced in inverse-beta decay. new measurement improves significantly on uncertainty value measured using this method.
Particle assembly at liquid-liquid interfaces presents a promising bottom-up strategy for creating supramolecular materials with advanced functionalities. However, the significantly lower interfacial tension observed in immiscible organic phases compared to traditional oil-water systems has hindered effective adsorption and of particles oil-oil interfaces. In this work, versatile is presented that utilizes jamming microgels polymer ligands non-aqueous create Pickering emulsions...
Pickering emulsions prepared by various kinds of soft colloids such as the poly(N-isopropylacrylamide) (PNIPAM)-based microgels, have been studied for decades in order to fabricate stimuli-responsive emulsions. It has generally viewed that interfacial properties microgel monolayers and emulsion stability are dominated softness or deformability particles. However, there is still no convenient way characterize adsorption/desorption energy microgels at interface although this an essential topic...