The Reaction Probability and the Reaction Cross-section of N + O₂→ NO + O Reaction Computed by the 6th-order Explicit Symplectic Algorithm

He, Jianfeng,Li, Jing Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.12

We have calculated the reaction probability and the reaction cross-section of the $N(^4S)+O_2(X^3\sum_{g}^{-})\;\rightarrow\;NO(X^2\Pi)+O(^3P)$ reaction by the quasiclassical trajectory method with the 6th-order explicit symplectic algorithm, based on a new ground potential energy surface. The advantage of the 6th-order explicit symplectic algorithm, conserving both the total energy and the total angular momentum of the reaction system during the numerical integration of canonical equations, has firstly analyzed in this work, which make the calculation of the reaction probability more reliable. The variation of the reaction probability with the impact parameter and the influence of the relative translational energy on the reaction cross-section of the reaction have been discussed in detail. And the fact is found by the comparison that the reaction probability and the reaction cross-section of the reaction estimated in this work are more reasonable than the theoretical ones determined by Gilibert et al.

Biomass of Bacterioplankton and Protists and Their Ecological Importance in the Bering Sea

He, Jianfeng,Chen, Bo,Kang, Sung-Ho,Zeng, Yinxin,Cai, Minghong Korea Institute of Ocean ScienceTechnology 2004 Ocean and Polar Research Vol.26 No.2

The abundance, biomass and distribution of phytoplankton, bacterioplankton and heterotrophic protists in the Bering Sea were investigated from July to August 1999. Chlorophyll a concentrations in the surface waters ranged from 0.16 to $3.79{\mu}g\;l^{-1}$ Nano-phytoplankton were found to constitute from 63 to 98% of the total phytoplankton biomass, and were clearly the dominant primary producers. The biomass of bacterioplankton in the surface layers varied from 1.46 to $20.2{\mu}g\;C\;l^{-1}$ and accounted for 30% of the total phytoplankton biomass. The biomass of bacterioplankton integrated over a depth of 0 to 100m averaged 65.4% of the total phytoplankton biomass. The surface biomass of heterotrophic protists ranged from 1.2 to $27.4{\mu}g\;C\;l^{-1}$, and was within the same order of magnitude as that of bacterioplankton. Of the total biomass of heterotrophic protists in the upper 100m of the water column, 65% was attributed to protists in the nano-size class. The results of this study suggest that bacteria and nano-protists are important components of the planktonic community in the Bering Sea during the summer season. The abundance of bacterioplankton and planktonic protists decreased from the western to northeastern and eastern regions of the Bering Sea. The abundance of these organisms also decreased with depth. The available evidence suggests that variation in the abundance and distribution of these organisms may be affected by water currents and vertical temperature variation in the Bering Sea.

Biomass of Bacterioplankton and Protists and Their Ecological Importance in the Bering Sea

Jianfeng He,정경호,강성호,Bo Chen,Yinxin Zeng,Minghong Cai 한국해양과학기술원 2004 Ocean and Polar Research Vol.26 No.2

The abundance, biomass and distribution of phytoplankton, bacterioplankton and heterotrophic protists in the Bering Sea were investigated from July to August 1999. Chlorophyll a concentrations in the surface waters ranged from 0.16 to 3.79 mg l-1. Nano-phytoplankton were found to constitute from 63 to 98% of the total phytoplankton biomass, and were clearly the dominant primary producers. The biomass of bacterioplankton in the surface layers varied from 1.46 to 20.2 mg C l-1 and accounted for 30% of the total phytoplankton biomass. The biomass of bacterioplankton integrated over a depth of 0 to 100 m averaged 65.4% of the total phytoplankton biomass. The surface biomass of heterotrophic protists ranged from 1.2 to 27.4 mg C l-1, and was within the same order of magnitude as that of bacterioplankton. Of the total biomass of heterotrophic protists in the upper 100 m of the water column, 65% was attributed to protists in the nano-size class. The results of this study suggest that bacteria and nano-protists are important components of the planktonic community in the Bering Sea during the summer season. The abundance of bacterioplankton and planktonic protists decreased from the western to northeastern and eastern regions of the Bering Sea. The abundance of these organisms also decreased with depth. The available evidence suggests that variation in the abundance and distribution of these organisms may be affected by water currents and vertical temperature variation in the Bering Sea.

The Reaction Probability and the Reaction Cross-section of N + O2 → NO + O Reaction Computed by the 6th-order Explicit Symplectic Algorithm

Jianfeng He*,Jing Li 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.12

We have calculated the reaction probability and the reaction cross-section of the N(4S)+O2(X3Sg-) NO(X2P)+O(3P) reaction by the quasiclassical trajectory method with the 6th-order explicit symplectic algorithm, based on a new ground potential energy surface. The advantage of the 6th-order explicit symplectic algorithm, conserving both the total energy and the total angular momentum of the reaction system during the numerical integration of canonical equations, has firstly analyzed in this work, which make the calculation of the reaction probability more reliable. The variation of the reaction probability with the impact parameter and the influence of the relative translational energy on the reaction cross-section of the reaction have been discussed in detail. And the fact is found by the comparison that the reaction probability and the reaction cross-section of the reaction estimated in this work are more reasonable than the theoretical ones determined by Gilibert et al.

Energy-Efficient Power Control for Underlaying D2D Communication with Channel Uncertainty: User-Centric Versus Network-Centric

Jianfeng Ding,Lingge Jiang,Chen He 한국통신학회 2016 Journal of communications and networks Vol.18 No.4

Most existing resource management problem modelsarise from the original desire of allocating resources in either auser-centric or network-centric manner. The difference betweentheir objectives is obvious: user-centric methods attempt to optimizethe utility of individual users, whereas network-centric modelsintend to optimize the collective utilities of the entire network. In this paper, from the above two aspects, we analyze the robustpower control problem in device-to-device (D2D) communicationunderlaying cellular networks, where two types of channel uncertaintyset (e.g., ellipsoidal and column-wise) are considered. In theuser-centric method, we formulate the problem into the form of aStackelberg game, where the energy efficiency (EE) of each useris the ingredient of utility function. In order to protect the cellularuser equipment’s (CUE) uplink transmission, we introduce aprice based cost function into the objectives of D2D user equipment(DUE). The existence and uniqueness of the game with theinfluence of channel uncertainty and price are discussed. In thenetwork-centric method, we aim to maximize the collective EE ofCUEs and DUEs. We show that by the appropriate mathematicaltransformation, the network-centric D2D power control problemhas the identical local solution to that of a special case of the usercentricproblem, where price plays a key role. Numerical resultsshow the performance of the robust power control algorithms inthe user-centric and network-centric models.

Constant current/voltage characteristics inductive power transfer system with variable static S-T/FC compensation

Jianfeng Hong,Fei Pan,Ziheng Zhang,Jia Teng,Dekai He 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.3

Continuous mode changes during battery charging present a significant challenge for the application of inductive power transfer (IPT) in battery charging. Achieving constant-current (CC) and constant-voltage (CV) charging characteristics is crucial for its successful implementation. This paper proposes a variable static S-T/FC compensation topology based on switching state changes. It offers the advantages of being able to handle various load conditions, facilitating soft switching of the inverter throughout the operation process, and achieving CC and CV charging without changing the operating frequency of the system. The characteristics of the proposed topology were confirmed through a theoretical analysis. Additionally, a completely new parameter design method is proposed. The CC and CV characteristics of the proposed topology are verified through theoretical derivation and simulation analysis. Finally, a validation prototype is constructed to assess the feasibility and rationality of the proposed method, achieving a 3.5 A output current in the CC mode and a 70 V output voltage in the CV mode.

Similar Stocks

Wei He,Yuehan Wang,Jianfeng Yu 한국재무학회 2023 한국재무학회 학술대회 Vol.2023 No.11-1

Similarity between two stocks is measured by the distance between their characteristics such as price, size, book-to-market, return on assets, and investment- to-assets. We find that after a stocks most similar stocks have experienced high (low) returns in the past month, this focal stock tends to earn an abnormally high (low) return in the current month. The long-short portfolio strategy sorted on similar-stocks past average return earns a monthly CAPM alpha of 1:25% and a Fama-French six- factor alpha of 0:85%. This similarity effect is robust after controlling for style investing and a wide range of well-known rm-level characteristics that can predict returns in the cross section. Our result is consistent with the increased propensity for investors to buy other stocks with similar characteristics after experiencing positive returns for a currently held stock. We also explore other potential explanations for our findings.

Responsive manganese-based nanoplatform amplifying cGAS-STING activation for immunotherapy

Qingbin He,Runxiao Zheng,Junchi Ma,Luyang Zhao,Yafang Shi,Jianfeng Qiu 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00

Background The activation of the cyclic guanosine monophosphate-adenosine monophosphate synthasestimulator of interferon genes (cGAS-STING) signaling pathway has attracted great attention for its ability to up-regulate innate immune response and thus enhance cancer immunotherapy. However, many STING agonists limit the further advancement of immunotherapy due to weak tumor responsiveness or low activation efficiency. The responsive and effective activation of cGAS-STING signaling in tumors is a highly challenging process. Methods In this study, a manganese-based nanoplatform (MPCZ NPs) was constructed that could responsively and efficiently generate more manganese ions (Mn2+) and reactive oxygen species (ROS) to activate cGAS-STING signaling pathway. Briefly, manganese dioxide (MnO2) was loaded with zinc protoporphyrin IX (ZPP) molecule and coated by polydopamine (PDA) embedded with NH4HCO3 to obtain MPCZ NPs. Additionally, MPCZ NPs were evaluated in vitro and in vivo for their antitumor effects by methyl thiazolyl tetrazolium (MTT) assay and TUNEL assays, respectively. Results In this system, tumor responsiveness was achieved by exogenous (laser irradiation) and endogenous (high levels GSH) stimulation, which triggered the collapse or degradation of PDA and MnO2. Moreover, the release of Mn2+ augmented the cGAS-STING signaling pathway and enhanced the conversion of hydrogen peroxide (H2O2) to hydroxyl radical (·OH) under NIR laser irradiation. Furthermore, the release of ZPP and the elimination of GSH by MPCZ NPs inhibited HO-1 activity and prevented ROS consumption, respectively. Conclusions This adopted open source and reduce expenditure strategy to effectively generate more ROS and Mn2+ to responsively activate cGAS-STING signaling pathway, providing a new strategy for improving immunotherapy.

Bombyx mori used as a fast detection model of liver melanization after a clinical drug – Acetaminophen exposure

Yue He,Xu Xu,Jianfeng Qiu,Weimin Yin,Yang-Hu Sima,Shi-Qing Xu 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.1

Acetaminophen (APAP) is an effective and widely used analgesic. However, APAP overdose is the principal cause of acute liver failure (ALF) in many countries. Here, we report the phenomenon of liver melanization which occurred before APAP-induced ALF in mice. A melanic surface induced by APAP which was time- and dosedependent in the silkworm invertebrate model was observed. In addition, an APAP-induced acute tissue failure model (ATF) was established using a metabolic detoxification tissue fat body which simulated mouse liver. An investigation of the anabolic mechanism of melanin in experimental animals showed that dopaquinone and dopamine which were synthesized from tyrosine via dopa in silkworms were further metabolized to melanin, while in mice, epinephrine was synthesized via the dopamine branch and melanin was only synthesized via the dopaquinone branch. On this basis, it is proposed that melanin-metabolic levels in plasma could be used as an early diagnostic marker of APAP overdose and the black spots on insect epidermis could be used as a fast detection model of toxicity.

Energy-Efficient Power Control for Underlaying D2D Communication with Channel Uncertainty: User-Centric Versus Network-Centric

Ding, Jianfeng,Jiang, Lingge,He, Chen The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.4

Most existing resource management problem models arise from the original desire of allocating resources in either a user-centric or network-centric manner. The difference between their objectives is obvious: user-centric methods attempt to optimize the utility of individual users, whereas network-centric models intend to optimize the collective utilities of the entire network. In this paper, from the above two aspects, we analyze the robust power control problem in device-to-device (D2D) communication underlaying cellular networks, where two types of channel uncertainty set (e.g., ellipsoidal and column-wise) are considered. In the user-centric method, we formulate the problem into the form of a Stackelberg game, where the energy efficiency (EE) of each user is the ingredient of utility function. In order to protect the cellular user equipment's (CUE) uplink transmission, we introduce a price based cost function into the objectives of D2D user equipment (DUE). The existence and uniqueness of the game with the influence of channel uncertainty and price are discussed. In the network-centric method, we aim to maximize the collective EE of CUEs and DUEs. We show that by the appropriate mathematical transformation, the network-centric D2D power control problem has the identical local solution to that of a special case of the user-centric problem, where price plays a key role. Numerical results show the performance of the robust power control algorithms in the user-centric and network-centric models.