Search Results - Ke Xu

All-dielectric metasurfaces offer unconventional optical functional behaviors for manipulating light, due to the strong localization of light with negligible dissipative loss. Here, we propose a compact design for a light emission cavity consist of an all-dielectric grating reflector and an all-diel...

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Aluminum nitride (AlN) is an emerging platform for a wide range of on-chip applications. One promising feature is that both the second- and third-order nonlinearities are available in crystalline AlN waveguides. We design an AlN slot waveguide with a flat and low dispersion over an ultrawide spectra...

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This paper investigates the codebook design for the novel parallel dynamic subarrays for millimeter-wave (mmWave) massive MIMO systems. To generate high-resolution patterns, we design a novel parallel dynamic subarray structure where each radio frequency (RF) chain is dynamically connected to a suba...

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Layered materials have become one of the focuses in chemistry and materials science due to their unique structural characteristics and highly tunable properties. Clusters with mesoscale dynamic structures can be introduced into layered materials as structural units or guests, endowing cluster-based...

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Silicon photonic optical phased arrays are promising solutions for solid-state LIDAR. But the nonlinear absorption significantly saturates the optical power in the waveguides at 1.5-μm wavelengths. Besides, the high refractive index contrast of silicon grating exhibits a strong diffractio...

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As for vertical-cavity surface-emitting lasers (VCSEL)-based optical pulse amplitude modulation (PAM) interconnection system, apart from the universal signal distortions like Gaussian noise and fiber dispersion, direct modulation of VCSEL specially induces level nonlinearity and level-dependent nois...

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Abstract Northeast China (NEC) is one of the major crop producing regions in China, which is severely affected by persistently extreme temperatures during summer. Previous works focused on understanding the intensity of extreme temperatures, yet neglecting its duration and timing. Considering the cr...

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Advanced modulation formats with intensity modulation and direct detection (IM/DD) have shown promise in a short-reach optical communication system like data center interconnect. However, the conventional fiber transmission spectral window is mostly located at 850, 1310, and 1550&#x00...

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Metastatic colon adenocarcinoma to the gingiva is exceedingly rare, accounting for 1–3% of maxillofacial malignancies and usually associated with advanced disease and poor prognosis. This case report describes a 68-year-old woman diagnosed with metastatic colon adenocarcinoma presenting with a metas...

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ObjectiveThis study investigates the dynamic effects of household refrigerator ownership on dietary patterns and the risk of overweight and obesity. The objective is to offer policy guidance for developing countries that are facing health challenges during their nutritional transition.MethodsThis st...

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ABSTRACT Organoids are tissue analogues formed through in vitro three‐dimensional culture of stem cells, possessing specific spatial structures. Organoids have become integral to various biomedical fields, including disease pathogenesis, model construction, regenerative and precision medicine, drug...

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ObjectiveWe summarized the existing clinical evidence of repetitive transcranial magnetic stimulation (rTMS) for Parkinson’s Disease (PD) and Alzheimer’s Disease (AD) and conducted a series of dose-response meta-analyses to determine the curve relationship between the number of pulses and the effect...

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ObjectiveTo explore the dose and local efficacy of iodine-125 seed implantation therapy for lung tumors.MethodsThe clinical data of 85 patients with lung tumors who underwent iodine-125 seed implantation therapy were retrospectively analyzed. The impact of prescription dose D90 (minimum peripheral d...

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The transparent window in optical fiber at 2-μm waveband enables a huge potential for fiber optical communications. Intensive efforts have been devoted to pursuit of photonic devices in this new band. The arrayed waveguide grating (AWG) is one of the key components for various functionali...

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Abstract Background Intraoperative bleeding is a serious complication of spinal tumor surgery. Preoperative identification of patients at high risk of intraoperative blood transfusion (IBT) and intraoperative massive bleeding (IMB) before spinal tumor resection surgery is difficult but critical for...

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To investigate differentially expressed genes regulated by microRNA-451a in colorectal cancer. We detected expression of microRNA-451a in colorectal cancer samples and normal pericarcinous tissues from 68 colorectal cancer patients and the correlation between microRNA-451a and clinical features of t...

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We demonstrate integrated 1 × 4 power splitters at 2-μm spectral range with arbitrary power-splitting ratios. The devices are based on digital meta-structures that are designed by algorithm. Four devices with split ratios of 1:1:1:1, 2:2:1:1, 2:2:2:1, and 4:3:2:1 are inversely...

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In this paper, dyadic probabilistic shaping (PS) for pulse amplitude modulation (PAM) has been investigated and experimentally demonstrated for intensity-modulation and direct-detection optical interconnection systems. Improved achievable information rate can be obtained under the condition of limit...

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Owing to their multi-elemental compositions and unique high-entropy mixing states, high-entropy alloy (HEA) nanoparticles (NPs) displaying tunable activities and enhanced stabilities thus have become a rapidly growing area of research in recent years. However, the integration of multiple elements in...

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Fruit cracking is a persistent challenge for table grape growing. To investigate the mechanism of this disorder, a comprehensive two-year investigation was conducted to assess the fruit cracking percentage of 15 table grape (Vitis vinifera L.) varieties. Based on the findings, the cracking-susceptib...

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