Search results for: Haifeng Li

Items from 1 to 20 out of 360 results

article

Dynamic properties of Malan loess based on triaxial shear tests

Haifeng Li, Zhiliang Chen, Lei Zhu, Lin Tang, more

Geological Journal > 59 > 9 > 2487 - 2495

Malan loess possesses unfavourable engineering mechanical properties that may vary depending on the geological context in which it exists. In the context of roadbed loading, the structural characteristics of the loess roadbed often result in uneven settlement, which significantly impacts transportation safety. To investigate the dynamic behaviour of loess under the influence of vehicle loading, groups...

article

Freeform Liquid–Crystal Polarization Imaging Optics: A Practical Approach from Design to Fabrication

Chunyang Pei, Jiacheng Weng, Tian Shu, Linyue Fang, more

Laser & Photonics Reviews > 18 > 9 > n/a - n/a

Freeform liquid–crystal polarization imaging optics (LPIOs) have vast potential for application in next‐generation interactive displays like augmented reality and virtual reality. However, tailoring the phase profile of a freeform LPIO for flexible aberration correction and diffraction efficiency control is still a big challenge due to the difficulties arising from the non‐zero étendue of an imaging...

article

P‐4.23: Design of High‐Angular Uniformity Two‐Dimensional Gratings for AR Head‐Mounted Devices

Hui Yang, Ziyin Li, Haifeng Li, Xu Liu

SID Symposium Digest of Technical Papers > 55 > S1 > 838 - 841

We have designed a two‐dimensional surface relief grating for waveguide input coupling in augmented reality (AR) displays, characterized by a large field of view and high angular uniformity. The initial structure of this grating is based on effective refractive index theory. We utilized a Downhill Simplex algorithm to optimize the efficiency of the first transmission diffraction order. With high diffraction...

article

P‐4.6: Curved augmented reality display using printed freeform holographic optical element

Tian Shu, Chunyang Pei, Rengmao Wu, Haifeng Li

SID Symposium Digest of Technical Papers > 55 > S1 > 771 - 774

We propose a methodfor designing and fabricating freeform HOEs on curved optical substrates that can be utilized to implement curved augmented reality (AR) displays. Compared with conventional HOEs, freeform HOEs can enhance image performance and enlarge degrees of freedom in design. In our method, the phase profiles of the freeform HOE on the curved surface are first optimized to achieve good image...

article

67‐2: Image Quality, Uniformity and Computation Improvement of Compressive Light Field Displays with U‐Net

Chen Gao, Haifeng Li, Xu Liu, Xiaodi Tan

SID Symposium Digest of Technical Papers > 55 > S1 > 587 - 590

We apply the U‐Net model for compressive light field synthesis. Compared to methods based on stacked CNN and iterative algorithms, this method offers better image quality, uniformity and less computation.

article

The effect of Aceria litchii (Keifer) infestation on the surface properties of litchi leaf hosts

Qingkui Song, Jianyu Zheng, Shengde Chen, Yubin Lan, more

Pest Management Science > 80 > 6 > 2647 - 2657

BACKGROUND The wettability of target crop surfaces affects pesticide wetting and deposition. The structure and properties of the leaf surface of litchi leaves undergo severe changes after infestation by Aceria litchii (Keifer). The objective of this study was to systematically investigate the surface texture and wettability of litchi leaves infested. RESULTS Firstly, the investigation focused on...

article

Indirect Z‐scheme TiO₂/BC/g‐C₃N₄ for efficient photocatalytic reduction of Cr(VI) in aqueous solution

Mingliang Chen, Guanghui Wang, Jialing Dai, Haifeng Li, more

Journal of Chemical Technology & Biotechnology > 99 > 2 > 415 - 425

BACKGROUND There is increasing concern regarding the rising issue of Cr(VI) pollution in aqueous solutions. It is crucial to find an effective technology for the removal of Cr(VI) in aqueous solutions. In this work, a novel TiO₂/BC/g‐C₃N₄ heterostructure photocatalyst was successfully prepared by a simple hydrothermal method and characterized by scanning electron microscopy, transmission electron...

article

40.3: Polarization‐dependent Binocular Waveguide Display with Patterned Cholesteric Liquid Crystal Optics

Jiacheng Weng, Haifeng Li, Xu Liu

SID Symposium Digest of Technical Papers > 54 > S1 > 267 - 270

We demonstrate a polarization-dependent binocular waveguide display for augmented reality. Two polarization volume lenses (PVLs) are used to collimate and couple the light emitted from a single display panel into the waveguide, and two polarization volume gratings (PVGs) are used to couple the light out to the human eyes. With the proposed design, different high-quality images can be independently produced in the two eyes....

article

Grain Morphology and Microstructure Control in High‐Stable Ni‐Rich Layered Oxide Cathodes

Lin Wang, Baofu Zhu, Dongdong Xiao, Xu Zhang, more

Advanced Functional Materials > 33 > 31 > n/a - n/a

Ni‐rich layered oxides are promising cathode material for high‐energy‐density lithium‐ion batteries (LIBs). However, they suffer from poor capacity retention due to unstable structures. Herein, a strategy of high‐valence W doping is put forward to tune the nanometer‐sized crystal domains and reshape the primary particle textures, which can stabilize the structure against the formation of microcracks...

article

Dynamic simulation of the grassland connectivity and the effects of landscape pattern in China's Poyang Lake from the integrated perspective of habitat and biology

Cheng Zhang, Wenbo Chen, Lei He, Fangfang Huang, more

Ecohydrology > 16 > 5 > n/a - n/a

Analysing the dynamics of landscape connectivity is of great significance for biodiversity conservation, but the scientific expression of ecological processes and the depth of coupling landscape pattern and ecological process requires to be strengthened. Taking the grassland of Poyang Lake as a case, based on the integrated perspective of habitat and biology, and comprehensively considering the ecological...

article

Melatonin‐induced myeloblastosis viral oncogene homologs alleviate fresh‐cut lotus root browning during storage by attenuating flavonoid biosynthesis and reactive oxygen species

Chen Zhang, Ying Xin, Zhiwen Wang, Lili Qin, more

Journal of the Science of Food and Agriculture > 103 > 11 > 5452 - 5461

BACKGROUND Lotus roots (Nelumbo nucifera Gaertn.) are rich in nutrients and have ornamental and food value. However, browning has caused huge economic losses and security risks during the storage and harvesting of fresh‐cut lotus. This study investigated the role of melatonin in inhibiting lotus browning, and illustrates its molecular mechanism. RESULTS The application of melatonin effectively...

article

Stacking Faults Inducing Oxygen Anion Activities in Li₂MnO₃

Boya Wang, Zengqing Zhuo, Haifeng Li, Shiqi Liu, more

Advanced Materials > 35 > 22 > n/a - n/a

Controllable anionic redox for a transformational increase in the energy density is the pursuit of next generation Li‐ion battery cathode materials. Its activation mechanism is coupled with the local coordination environment around O, which posts experimental challenges for control. Here, the tuning capability of anionic redox is shown by varying O local environment via experimentally controlling...

article

Matching Bidentate Ligand Anchoring: an Accurate Control Strategy for Stable Single‐Atom/ZIF Nanocatalysts

Yapei Yun, Haitao Zeng, Lin Li, Haifeng Li, more

Advanced Materials > 35 > 7 > n/a - n/a

Improving metal loading and controlling the coordination environment is nontrivial and challenging for single‐atom catalysts (SACs), which have the greatest atomic efficiency and largest number of interface sites. In this study, a matching bidentate ligand (MBL) anchoring strategy is designed for the construction of CuN₄ SACs with tunable coordination environments (Cu loading range from 0.4 to15.4...

article

Gradient “Single‐Crystal” Li‐Rich Cathode Materials for High‐Stable Lithium‐Ion Batteries

Tianhao Wu, Xu Zhang, Yinzhong Wang, Nian Zhang, more

Advanced Functional Materials > 33 > 4 > n/a - n/a

As one of the high‐energy cathode materials of lithium‐ion batteries (LIBs), lithium‐rich‐layered oxide with “single‐crystal” characteristic (SC‐LLO) can effectively restrain side reactions and cracks due to the reduced inner boundaries and enhanced mechanical stabilities. However, there are still high challenges for SC‐LLO with diverse performance requirements, especially on their cycle stability...

article

Effects of ecological restoration patterns on runoff and sediment in an abandoned coal mine of Southern China

Hao Li, Wenbo Chen, Cheng Zhang, Lei He, more

Environment Protection Engineering > 2023 > Vol. 49, nr 4 > 29--44

Evaluating the ecological economic benefits of different ecological restoration patterns in abandoned mines is important in ecological restoration study. Taking the abandoned coal mine in Luoshi Township of Fengcheng county, Jiangxi province, as a case, 4 different ecological restoration patterns (grapefruit with grass vegetation – Pattern I, pine with grass vegetation – Pattern II, grapefruit – Pattern...

article

Petrogenesis and Geodynamic Implications of Early Cretaceous (∼130 Ma) Magmatism in the Baingoin Batholith, Central Tibet: Products of Subducting Slab Rollback

Faqiao LI, Juxing TANG, Nan WANG, Zhibo LIU, more

Acta Geologica Sinica ‐ English Edition > 96 > 6 > 1960 - 1978

The Baingoin batholith is one of the largest granitic plutons in the North Lhasa terrane. Its petrogenesis and tectonic setting have been studied for decades, but remain controversial. Here we report data on geochronology, geochemistry and isotopes of Early Cretaceous granitoids within the Baingoin batholith, which provide more evidence to uncover its petrogenesis and regional geodynamic processes...

article

20.3: Weighted Simultaneous Algebra Reconstruction Technique (wSART) for Additive Light Field Synthesis

Chen Gao, Linqi Dong, Liang Xu, Xu Liu, more

SID Symposium Digest of Technical Papers > 53 > S1 > 243 - 246

We apply an iterative weighting scheme for additive light field synthesis. Unlike previous work optimizing additive light field evenly over viewpoints, we constrain the optimization to deliver a reconstructed light field of high image quality for viewpoints of large weight.

article

6.1: Autostereoscopic Display with a Multidirectional Backlight System and an Eye tracker

Ziyin Li, Chen Gao, Haifeng Li, Xu Liu

SID Symposium Digest of Technical Papers > 53 > S1 > 76 - 79

We implement a time‐sequential autostereoscopic display with a multidirectional backlight system and an eye tracker. The proposed multidirectional backlight uses Bragg mismatched reconstruction of volume‐holographic optical elements. The eye tracker feeds back eye positions, and the system provides directional and time‐sequential parallax images. Through this display, viewers could observe vivid three‐dimensional...

article

A data‐driven adversarial examples recognition framework via adversarial feature genomes

Li Chen, Qi Li, Weiye Chen, Zeyu Wang, more

International Journal of Intelligent Systems > 37 > 9 > 6438 - 6462

Adversarial examples pose many security threats to convolutional neural networks (CNNs). Most defense algorithms prevent these threats by finding differences between the original images and adversarial examples. However, the found differences do not contain features about the classes, so these defense algorithms can only detect adversarial examples without recovering the correct labels. In this regard,...

article

Simulation of β‐dextranase from raw natural rubber to investigate structure and properties of natural rubber/halloysite composites

Tiwen Xu, Yuanni Xin, Yueqiong Wang, Lusheng Liao, more

Polymer Composites > 43 > 2 > 798 - 810

The effects of crude β‐dextranase in raw natural rubber (NR) on the structure and properties of NR/halloysite nanotube (HNT) composites are investigated by introducing external biological β‐dextranase. Results of curing tests as well as mechanical and dynamic mechanical analyses show that the curing time of the composite increases with β‐dextranase concentration and then plateaus at 6 wt%, at which...

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INFONA - science communication portal

Search results for: Haifeng Li

Dynamic properties of Malan loess based on triaxial shear tests

Freeform Liquid–Crystal Polarization Imaging Optics: A Practical Approach from Design to Fabrication

P‐4.23: Design of High‐Angular Uniformity Two‐Dimensional Gratings for AR Head‐Mounted Devices

P‐4.6: Curved augmented reality display using printed freeform holographic optical element

67‐2: Image Quality, Uniformity and Computation Improvement of Compressive Light Field Displays with U‐Net

The effect of Aceria litchii (Keifer) infestation on the surface properties of litchi leaf hosts

Indirect Z‐scheme TiO₂/BC/g‐C₃N₄ for efficient photocatalytic reduction of Cr(VI) in aqueous solution

40.3: Polarization‐dependent Binocular Waveguide Display with Patterned Cholesteric Liquid Crystal Optics

Grain Morphology and Microstructure Control in High‐Stable Ni‐Rich Layered Oxide Cathodes

Dynamic simulation of the grassland connectivity and the effects of landscape pattern in China's Poyang Lake from the integrated perspective of habitat and biology

Melatonin‐induced myeloblastosis viral oncogene homologs alleviate fresh‐cut lotus root browning during storage by attenuating flavonoid biosynthesis and reactive oxygen species

Stacking Faults Inducing Oxygen Anion Activities in Li₂MnO₃

Matching Bidentate Ligand Anchoring: an Accurate Control Strategy for Stable Single‐Atom/ZIF Nanocatalysts

Gradient “Single‐Crystal” Li‐Rich Cathode Materials for High‐Stable Lithium‐Ion Batteries

Effects of ecological restoration patterns on runoff and sediment in an abandoned coal mine of Southern China

Petrogenesis and Geodynamic Implications of Early Cretaceous (∼130 Ma) Magmatism in the Baingoin Batholith, Central Tibet: Products of Subducting Slab Rollback

20.3: Weighted Simultaneous Algebra Reconstruction Technique (wSART) for Additive Light Field Synthesis

6.1: Autostereoscopic Display with a Multidirectional Backlight System and an Eye tracker

A data‐driven adversarial examples recognition framework via adversarial feature genomes

Simulation of β‐dextranase from raw natural rubber to investigate structure and properties of natural rubber/halloysite composites

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