Search results for: Pengfei Ma

Items from 1 to 20 out of 87 results

article

Aeolian sediment provenance and transport in the upper and middle reaches of the Yarlung Zangbo River, Tibet Plateau

Zhengcai Zhang, Pengfei Ma, Zhen La, Yan Zhang, more

Frequent and serious aeolian disasters occur in the upper and middle reaches of the Yarlung Zangbo River, which runs through the high‐elevation Tibet Plateau. Sediment geochemical characteristics can be used as a proxy to identify the sediment's provenance. To determine the provenance of aeolian sediments in the river's basin, we analysed major and trace element contents from surface samples and local...

article

Application of laparoscopic dual localization of small lesions in radical resection of transverse colon: A video vignette

Zhenyu Li, Xijie Zhang, Pengfei Ma, Yanghui Cao, more

Colorectal Disease > 23 > 10 > 2780 - 2781

article

Hybrid Lead Halide Perovskite Films with Large Grain Size Via Spin‐Coating Free Fabrication

Wenyan Liu, Pengfei Ma, Jiaying Xu, Changhao Wang, more

physica status solidi (a) > 218 > 6 > n/a - n/a

Herein, a spin‐coating‐free method to deposit CH₃NH₃PbI₃ perovskite films with large grains is demonstrated. The effect of processing temperature on the property of hybrid lead halide perovskite films is investigated. It is found that the grain domain size is enlarged by increasing processing temperature. Dense and uniform CH₃NH₃PbI₃ films with grain domain size close to 1 mm are obtained using this...

article

Processes at the soil–root interface determine the different responses of nutrient limitation and metal toxicity in forbs and grasses to nitrogen enrichment

Qiuying Tian, Peng Lu, Pengfei Ma, Huirong Zhou, more

Journal of Ecology > 109 > 2 > 927 - 938

Nutrient limitation and metal toxicity have been implicated in changes of grassland communities by nitrogen (N) deposition. Below‐ground processes, especially those at the soil–root interface, play important roles in determining variation in nutrient concentrations in plants. However, few studies have specifically focused on the roles of these processes in mineral‐element acquisition in grassland...

article

Reconstruction of the Cenozoic deformation of the Bohai Bay Basin, North China

Yinbing Zhu, Shaofeng Liu, Bo Zhang, Michael Gurnis, more

Basin Research > 33 > 1 > 364 - 381

A well‐constrained plate deformation model may lead to an improved understanding of sedimentary basin formation and the connection between subduction history and over‐riding plate deformation. Building quantitative models of basin kinematics and deformation remains challenging often due to the lack of comprehensive constraints. The Bohai Bay Basin (BBB) is an important manifestation of the destruction...

article

Below‐ground‐mediated and phase‐dependent processes drive nitrogen‐evoked community changes in grasslands

Qiuying Tian, Liuyi Yang, Pengfei Ma, Huirong Zhou, more

Journal of Ecology > 108 > 5 > 1874 - 1887

Enhanced deposition of atmospheric nitrogen (N) leads to loss of plant diversity in grassland ecosystems. Numerous theories have provided potential explanations for the negative effects of N enrichment on plant diversity. However, the relative importance of each mechanism and the time‐scales of responses for the different functional groups remain unclear. We investigated the temporal responses...

article

T‐cell exhaustion interrelates with immune cytolytic activity to shape the inflamed tumor microenvironment

Mei‐Chun Cai, Xiaojing Zhao, Min Cao, Pengfei Ma, more

The Journal of Pathology > 251 > 2 > 147 - 159

Direct quantification of exhausted T cells in human cancer is lacking, and its predictive value for checkpoint‐based treatment remains poorly investigated. We sought to systematically characterize the pan‐cancer landscape and molecular hallmarks of T‐cell dysfunction for the purpose of precision immunotherapy. Here, we defined a transcriptional signature for T‐cell exhaustion through analyzing differential...

article

Simultaneously enhancing the thermal conductivity and dielectric constant of BN/CF hybrid filled polypropylene/polystyrene composites via in situ reactive processing

Xueliang Jiang, Pengfei Ma, Cong Zhou, Wenwen Zhu, more

Polymer Composites > 41 > 4 > 1234 - 1241

Thermal conductive and electrical insulating polymer composites are exerted a tremendous fascination on the field of thermal management. The effective utilization of fillers is indispensable to construct the thermal conductive pathway to fabricate high thermal conductive polymer composites. Herein, a facile approach involves selective localization of boron nitride (BN) and carbon fiber (CF) through...

article

Nonlinear photoresponse of metallic graphene-like VSe₂ ultrathin nanosheets for pulse laser generation

Tao Wang, Xinyao Shi, Jin Wang, Yijun Xu, more

Science China Information Sciences > 2019 > 62 > 12 > 1-8

Vanadium diselenide (VSe₂), a typical metallic behaviour material among transition metal dichalcogenides (TMDCs) family, exhibits excellent photoelectric characteristics with a zero band gap, missing applicaiotn in pulse generation. In this work, a high-quality VSe₂ saturable absorber (SA) was synthesized through a liquid-phase exfoliation method. The saturable absorption of obtained VSe₂-SA was characterized...

article

The nonextensive Bose-Einstein condensation and photon gas with parameter transformation

Pengfei Ma, Yahui Zheng, Guangyue Qi

The European Physical Journal Plus > 2019 > 134 > 10 > 1-11

. The nonextensive boson system is revisited with the statistical ensemble theory, where the fundamental grand canonical distribution is derived from the equiprobability principle. By recourse to the approach of parameter transformation, one familiar and concise statistical formula for bosons is deduced, in an accurate fashion. Then the Bose-Einstein condensation phenomenon is re-discussed. The results...

article

8.4: Invited Paper: Oxide devices for displays and low power electronics

Jiawei Zhang, Wensi Cai, Joshua Wilson, Xiaochen Ma, more

SID Symposium Digest of Technical Papers > 50 > S1 > 81 - 84

Oxide semiconductors have been envisaged to find applications in flexible electronics in daily life such as wearable electronic gadgets to offer novel user experiences. However, there are still several bottlenecks to overcome in order to realise this goal, especially the lack of oxide‐semiconductor components fast enough for wireless communications, low power oxide transistors, and high‐performance...

article

Experimental research on rheological and mechanical properties of nano silica sol grout

Pengcheng Wang, Shuchen Li, Yang Li, Xianda Feng, more

Journal of Sol-Gel Science and Technology > 2019 > 91 > 1 > 178-188

Nano silica sol (NSS) grouting is an effective method to improve water blocking capacity of rock fracture and fine sand. However, the mechanical and rheological properties of NSS grout remain poorly investigated. We study the properties by (1) measuring gelling time of NSS grout with a different accelerator dosage, (2) measuring shear strength of NSS with fall-cone test, (3) measuring the permeability...

article

Development status of high power fiber lasers and their coherent beam combination

Zejin Liu, Xiaoxi Jin, Rongtao Su, Pengfei Ma, more

Science China Information Sciences > 2019 > 62 > 4 > 1-32

High-power fiber laser has been emerged great potential in a wide range of applications and becomes a robust candidate for high energy solid state laser system. To further increase the output brightness of single-channel fiber laser, high-brightness pump sources and high-power-handling passive components should be fabricated and utilized in the fiber laser systems, in addition to the advanced techniques...

article

Clinicopathological, microenvironmental and genetic determinants of molecular subtypes in KEAP1/NRF2‐mutant lung cancer

Mei‐Chun Cai, Minjiang Chen, Pengfei Ma, Jie Wu, more

International Journal of Cancer > 144 > 4 > 788 - 801

Somatic KEAP1‐NRF2 pathway alterations are frequently detected in both lung adenocarcinomas and squamous cell carcinomas. However, the biological characteristics and molecular subtypes of KEAP1/NRF2‐mutant lung cancer remain largely undefined. Here, we performed a stepwise, integrative analytic and experimental interrogation of primary tumors and cancer cell lines harboring KEAP1 or NFE2L2 (encoding...

article

Improvement of Charge Injection by Using Separated SiN as Charge Trapping Layer in MONOS Charge Trap Flash Memory

Hao Ji, Yehui Wei, Pengfei Ma, Ran Jiang

IEEE Journal of the Electron Devices Society > 2018 > 6 > 1 > 81 - 84

The charge trapping characteristics in the metal-oxide-nitride-oxide-silicon memory with separated trapping layer were investigated. Charge injection was enhanced for the reduction of effective oxide thickness of the gate dielectric. High program/erase speed as well as large shift of the threshold voltage were obtained. Charges injection was improved according to the constant current stress measurement...

article

Changes in above and belowground traits of a rhizome clonal plant explain its predominance under nitrogen addition

Zhi Zheng, Pengfei Ma

Plant and Soil > 2018 > 432 > 1-2 > 415-424

Background and aimsDespite extensive studies documenting that changes in plant community structure in response to enhanced atmospheric nitrogen (N) deposition were driven by positive effects of N enrichment on rhizome clonal plants in grassland communities, few studies have specifically investigated the responses of rhizome clonal plants to N enrichment in terms of above-and below-ground plant traits...

article

Intrinsic Mechanism for Spectral Evolution in Single-Frequency Raman Fiber Amplifier

Wei Liu, Pengfei Ma, Yu Miao, Hanshuo Wu, more

IEEE Journal of Selected Topics in Quantum Electronics > 2018 > 24 > 5 > 1 - 8

In this paper, the spectral evolution properties in single-frequency Raman fiber amplifier (RFA) based on different pump schemes are analyzed theoretically for the first time based on the gain dynamics. It reveals that the walk-off effect in counter-pumped scheme acts as a natural low-pass filter for single-frequency RFA. When multilongitudinal mode rare-earth-doped fiber laser is used as the pump...

article

Investigation of performances and flow characteristics of two bi-directional pumps with different airfoil blades

PengFei Ma, Jun Wang, HaiFeng Wang

Science China Technological Sciences > 2018 > 61 > 10 > 1588-1599

Today, the most commonly used bi-directional airfoil in hydraulic machinery is the S-shaped airfoil (SA). A new bi-directional airfoil, obtained by lowering the bent airfoil camber and thickening the bone line bi-directionally, is proposed. Two bi-directional axial flow pumps, with the SA blades and the arc airfoil (AA) blades, respectively, were designed to verify the applicability of this airfoil...

article

TiS2,MoS2,WS2/Sb2Te3 mixed nanosheets saturable absorber for dual-wavelength passively Q-switched Nd:GYSGG Laser

Qi Song, Zhiyang Wu, Pengfei. Ma, GuojuWang, more

Infrared Physics & Technology > 2018 > 92 > C > 1-5

We demonstrate the mixed antimony telluride-molybdenum disulfide/tungsten disulfide/titanium disulfide as saturable absorber for efficient passively Q-switching of Nd:GYSGG laser. Sb₂Te₃-MoS₂, Sb₂Te₃-WS₂ and Sb₂Te₃-TiS₂ dispersions with large populations of few layers were prepared by liquid-phase exfoliation. At the pump power of 5 W, dual-wavelength Q-switched operation were obtained with the output...

article

Arbuscular mycorrhizal fungal communities associated with two dominant species differ in their responses to long‐term nitrogen addition in temperate grasslands

Zhi Zheng, Pengfei Ma, Juan Li, Lifei Ren, more

Functional Ecology > 32 > 6 > 1575 - 1588

Arbuscular mycorrhizal (AM) fungi are important components of grassland ecosystems and are sensitive to enhanced atmospheric nitrogen (N) deposition. Enhanced N deposition has been widely reported to reduce species richness and alter species composition across different types of grasslands world‐wide. Despite extensive studies on effects of N deposition on AM fungal communities of grasslands,...

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INFONA - science communication portal

Search results for: Pengfei Ma

Aeolian sediment provenance and transport in the upper and middle reaches of the Yarlung Zangbo River, Tibet Plateau

Application of laparoscopic dual localization of small lesions in radical resection of transverse colon: A video vignette

Hybrid Lead Halide Perovskite Films with Large Grain Size Via Spin‐Coating Free Fabrication

Processes at the soil–root interface determine the different responses of nutrient limitation and metal toxicity in forbs and grasses to nitrogen enrichment

Reconstruction of the Cenozoic deformation of the Bohai Bay Basin, North China

Below‐ground‐mediated and phase‐dependent processes drive nitrogen‐evoked community changes in grasslands

T‐cell exhaustion interrelates with immune cytolytic activity to shape the inflamed tumor microenvironment

Simultaneously enhancing the thermal conductivity and dielectric constant of BN/CF hybrid filled polypropylene/polystyrene composites via in situ reactive processing

Nonlinear photoresponse of metallic graphene-like VSe₂ ultrathin nanosheets for pulse laser generation

The nonextensive Bose-Einstein condensation and photon gas with parameter transformation

8.4: Invited Paper: Oxide devices for displays and low power electronics

Experimental research on rheological and mechanical properties of nano silica sol grout

Development status of high power fiber lasers and their coherent beam combination

Clinicopathological, microenvironmental and genetic determinants of molecular subtypes in KEAP1/NRF2‐mutant lung cancer

Improvement of Charge Injection by Using Separated SiN as Charge Trapping Layer in MONOS Charge Trap Flash Memory

Changes in above and belowground traits of a rhizome clonal plant explain its predominance under nitrogen addition

Intrinsic Mechanism for Spectral Evolution in Single-Frequency Raman Fiber Amplifier

Investigation of performances and flow characteristics of two bi-directional pumps with different airfoil blades

TiS2,MoS2,WS2/Sb2Te3 mixed nanosheets saturable absorber for dual-wavelength passively Q-switched Nd:GYSGG Laser

Arbuscular mycorrhizal fungal communities associated with two dominant species differ in their responses to long‐term nitrogen addition in temperate grasslands

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