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| 1 | Two-Stage Transformerless Dual-Buck PV Grid-Connected Inverters with High Efficiency显示文摘A semi-two-stage common-ground-type transformerless dual-buck-based grid-connected inverter is proposed in this paper.The common-ground-type topology can eliminate common mode(CM)leakage current by connecting the negative terminal of the photovoltaic(PV)directly to the neutral point of the grid,which bypasses the PV array’s stray capacitance.The dual-buck-based topology guarantees increased robustness since the dc-link cannot be short-circuited by a shoot-through event.The semi-two-stage topology features multi-level characteristic,which has a lower forward-voltage drop and smaller dv/dt.Compared with the conventional two-stage inverter,the proposed topology achieves higher efficiency and higher reliability.Experimental results of a 1.5kW prototype show that the proposed inverter is able to achieve high efficiency and low leakage currents. | Li Zhang Fengkai Jiang Dewei(David)Xu Kai Sun Yongqiang Hao Tao Zhang | 2018 | Chinese Journal of Electrical Engineering2018，4，2： | 4 |
| 2 | Luminescence tuning of Ce^3+,Pr^3+activated(Y,Gd)AGG system by band gap engineering and energy transfer显示文摘Tuning of phosphor luminescence properties,including the emission energy/intensity and thermal stability,is an important way to develop superior luminescent materials for diverse applications.In this work,we discuss the effect of band gap engineering and energy transfer on the luminescence properties of Ce^3+or Pr^3+doped(Y,Gd)AGG systems,and analyze the underlying reasons for their different phenomena.By using VUV-UV excitation spectra and constructing VRBE schemes,the changes of host band structure,5 d excited level energies and emission thermal stability of Ce^3+and Pr^3+with the incorporation of Gd^3+ions were studied.In addition,the energy transfer dynamics was also investigated in terms of the luminescence decay curves.This work demonstrates a way to tune phosphor luminescence properties by combining band gap engineering and energy transfer tailoring and provides an inspiring discussion on the different results of Ce^3+doping on the Ce^3+and Pr^3+emissions. | Yiyi Ou Weijie Zhou Fengkai Ma Chunmeng Liu Rongfu Zhou Fang Su Yan Huang Pieter Dorenbos Hongbin Liang | 2020 | Journal of Rare Earths2020，38，5： | 3 |
| 3 | PMN-MDSCs modulated by CCL20 from cancer cells promoted breast cancer cell stemness through CXCL2-CXCR2 pathway显示文摘Our previous studies have showed that C-C motif chemokine ligand 20(CCL20)advanced tumor progression and enhanced the chemoresistance of cancer cells by positively regulating breast cancer stem cell(BCSC)self-renewal.However,it is unclear whether CCL20 affects breast cancer progression by remodeling the tumor microenvironment(TME).Here,we observed that polymorphonuclear myeloid-derived suppressor cells(PMN-MDSCs)were remarkably enriched in TME of CCL20-overexpressing cancer cell orthotopic allograft tumors.Mechanistically,CCL20 activated the differentiation of granulocyte-monocyte progenitors(GMPs)via its receptor C-C motif chemokine receptor 6(CCR6)leading to the PMN-MDSC expansion.PMN-MDSCs from CCL20-overexpressing cell orthotopic allograft tumors(CCL20-modulated PMN-MDSCs)secreted amounts of C-X-C motif chemokine ligand 2(CXCL2)and increased ALDH+BCSCs via activating CXCR2/NOTCH1/HEY1 signaling pathway.Furthermore,C-X-C motif chemokine receptor 2(CXCR2)antagonist SB225002 enhanced the docetaxel(DTX)effects on tumor growth by decreasing BCSCs in CCL20high-expressing tumors.These findings elucidated how CCL20 modulated the TME to promote cancer development,indicating a new therapeutic strategy by interfering with the interaction between PMN-MDSCs and BCSCs in breast cancer,especially in CCL20high-expressing breast cancer. | Rui Zhang Mengxue Dong Juchuanli Tu Fengkai Li Qiaodan Deng Jiahui Xu Xueyan He Jiajun Ding Jie Xia Dandan Sheng Zhaoxia Chang Wei Ma Haonan Dong Yi Zhang Lixing Zhang Lu Zhang Suling Liu | 2023 | Signal Transduction and Targeted Therapy2023，8，4： | 2 |
| 4 | Revisiting the role of delta-1-pyrroline-5-carboxylate synthetase in drought-tolerant crop breeding显示文摘The delta-1-pyrroline-5-carboxylate synthetase(P5CS)gene exercises a protective function in stressed plants.However,the relationship between proline accumulation caused by P5CS and abiotic stress tolerance in plants is not always clear,as P5CS overexpression has been reported to repress plant growth under normal conditions in several reports.We re-evaluated the role of P5CS in drought-tolerant rice breeding by expressing the AtP5CS1 and feedback-inhibition-removed AtP5CS1(AtP5CS1^(F128A))genes under the regulation of an ABA-inducible promoter to avoid the potential side effects of P5CS overexpression under normal conditions.ABA-inducible AtP5CS1 and AtP5CS1^(F128A) increased seedling growth in a nutrient solution(under osmotic stress)and grain yield in pot plants.However,the evidently deleterious effects of AtP5CS1 on grain quality,tiller number,and grain yield in the field indicated the unsuitability of P5CS for drought-tolerance breeding. | Xuanjun Feng Yue Hu Weixiao Zhang Rongqian Xie Huarui Guan Hao Xiong Li Jia Xuemei Zhang Hanmei Zhou Dan Zheng Ying Wen Qingjun Wang Fengkai Wu Jie Xu Yanli Lu | 2022 | The Crop Journal2022，10，4： | 2 |
| 5 | Achieving High Thermoelectric Performance in Rare-Earth Element-Free CaMg_(2)Bi_(2) with High Carrier Mobility and Ultralow Lattice Thermal Conductivity显示文摘CaMg_(2)Bi_(2)-based compounds,a kind of the representative compounds of Zintl phases,have uniquely inherent layered structure and hence are considered to be potential thermoelectric materials.Generally,alloying is a traditional and effective way to reduce the lattice thermal conductivity through the mass and strain field fluctuation between host and guest atoms.The cation sites have very few contributions to the band structure around the fermi level;thus,cation substitution may have negligible influence on the electric transport properties.What is more,widespread application of thermoelectric materials not only desires high ZT value but also calls for low-cost and environmentally benign constituent elements.Here,Ba substitution on cation site achieves a sharp reduction in lattice thermal conductivity through enhanced point defects scattering without the obvious sacrifice of high carrier mobility,and thus improves thermoelectric properties.Then,by combining further enhanced phonon scattering caused by isoelectronic substitution of Zn on the Mg site,an extraordinarily low lattice thermal conductivity of 0.51Wm^(-1) K^(-1) at 873 K is achieved in(Ca_(0.75)Ba_(0.25))_(0.995)Na_(0.005)Mg_(1.95)Zn_(0.05)Bi_(1.98) alloy,approaching the amorphous limit.Such maintenance of high mobility and realization of ultralow lattice thermal conductivity synergistically result in broadly improvement of the quality factorβ.Finally,a maximum ZT of 1.25 at 873K and the corresponding ZTave up to 0.85 from 300 K to 873K have been obtained for the same composition,meanwhile possessing temperature independent compatibility factor.To our knowledge,the current ZTave exceeds all the reported values in AMg_(2)Bi_(2)-based compounds so far.Furthermore,the low-cost and environmentfriendly characteristic plus excellent thermoelectric performance also make the present Zintl phase CaMg_(2)Bi_(2) more competitive in practical application. | Muchun Guo Fengkai Guo Jianbo Zhu Li Yin Qian Zhang Wei Cai Jiehe Sui | 2020 | Research2020，，1： | 2 |
| 6 | Facile Methodfor Synthesis of Fe304@Polymer Microspheres and TheirApplication As Magnetic Support for Loading Meta]Nanoparticles显示文摘 | Bin Liu Wei Zhang Fengkai Yang | 2011 | Phys Chem C2011，115，15： | 1 |
| 7 | Enhanced thermoelectric properties of Zintl phase YbMg_(2)Bi1.98 through Bi site substitution with Sb显示文摘Benefiting from the unique'Phonon-Glass,Electron-Crystal'(PGEC)characteristic,Zintl phases have been considered as a kind of promising thermoelectric materials.For the typical AM2X2 compounds with the CaAl2Si2-type structure,YbMg_(2)Bi2 has shown competitive thermoelectric performance recently.Nevertheless,the optimization of YbMg_(2)Bi2 compounds is primarily focused on the substitution on Yb or Mg site.Herein,the Bi site is substituted by isoelectric Sb and the effect on the thermoelectric transport behavior is investigated.The partial substitution reduces the carrier concentration and induces the lattice deformation caused by the different atomic radius and mass between Bi and Sb,further leading to the decreased power factor and thermal conductivity.Fortunately,the reduction extent of the thermal conductivity outperforms that of power factor.Finally,the Sb substitution successfully results in a better thermoelectric performance compared with that of the pristine YbMg_(2)Bi1.98.Especially,the calculated energy conversion efficiency(a)of YbMg_(2)Bi1.88Sb0.1 which also possesses a relatively high output power density reaches the maximum value of 9.8% when Th=873 K,and Tc=300 K,respectively.This work demonstrates that the idea of substitution on anionic site should be a new strategy to achieve better ZT values for AM2X2 compounds. | Jing Wang Muchun Guo Jianbo Zhu Dandan Qin Fengkai Guo Qian Zhang Wei Cai Jiehe Sui | 2020 | Journal of Materials Science & Technology2020，59，24： | 1 |
| 8 | Undifferentiated State Induced by R b‐p53 Double Inactivation in Mouse Thyroid Neuroendocrine Cells and Embryonic Fibroblasts显示文摘 | Shunsuke Kitajima Susumu Kohno Atsushi Kondoh Nobunari Sasaki Yuuki Nishimoto Fengkai Li Mohammed Salah Abdallah Mohammed Hayato Muranaka Naoko Nagatani Misa Suzuki Yukiharu Kido Chiaki Takahashi | 2015 | Stem Cells2015，，5： | 1 |
| 9 | Functional transition of the rural settlement: Analysis of land-use differentiation in a transect of Beijing,China显示文摘 | Fengkai Zhu Fengrong Zhang Can Li | 2014 | Habitat International2014，41，： | 1 |
| 10 | A fast and ac- curate calibration method for the structured light system based on trapezoidal phase-shifting pattern 显示文摘 | Fengkai Ke Jingming Xie Youping Chen | 2014 | International Journal for Light and Electron Optics2014，125，18： | 1 |
| 11 | Photolysis of anthracene and chrysene in aquatic systems显示文摘 | Wang Yu Lin Fengkai Lin Zhulu | 1999 | Chemosphere1999，38，6： | 1 |
| 12 | Functional transition of the rural settlement: Analysis of land-use differentiation in a transect of Beijing, China显示文摘 | Zhu Fengkai Zhang Fengrong Li Can | 2014 | Habitat International2014，，41： | 1 |
| 13 | Promoted application potential of p-type Mg_(3)Sb_(1.5)Bi_(0.5)for thematched thermal expansion with its n-type counterpart显示文摘Recently,n-type Mg3Sb1.5Bi0.5-based thermoelectric materials have attracted considerable attention for their extraordinary thermoelectric performance.Ideally,thermoelectric generators should be made of the same material system to avoid thermal mismatch in the practical application.In this work,p-type Mg3Sb1.5Bi0.5 which has almost the same composition as the state-of-the-art n-type Mg3.2Sb1.5Bi0.49-Te0.01Mn0.01 was synthesized by ball milling and spark plasma sintering,and then Na was chosen as an acceptor dopant to optimize the carrier concentration and further improve the thermoelectric performance.Na0.0075Mg2.9925Sb1.5Bi0.5 sample gets the highest ZT of~0.5 at 773 K.While Na0.005Mg2.995Sb1.5Bi0.5 sample shows the highest average ZT of~0.29 in the temperature range of 300 e773 K and matched thermal expansion behavior with the state-of-the-art n-type Mg3.2Sb1.5Bi0.49-Te0.01Mn0.01,which is of great significance for practical applications.Taking the Joule and Thompson heat into account,a high theoretical conversion efficiency(η)of~9.5%was calculated for the thermoelectric module consists of the present p-type Na0.005Mg2.995Sb1.5Bi0.5 and the state-of-the-art n-type Mg3.2Sb1.5Bi0.49Te0.01Mn0.01 with the leg length of 2 mm,and cold and hot side temperature of 300 K and 773 K,respectively,which shows a good potential for the use of this class of materials in the midtemperature power generation applications. | Jinsuo Hu Fengkai Guo Muchun Guo Jianbo Zhu Chen Chen Qian Zhang Wei Cai Jiehe Sui | 2020 | Journal of Materiomics2020，6，4： | 1 |
| 14 | Applicationoflimeconditioningandlimedryingcraftonsludgedewatering[J]显示文摘 | FengKai(冯凯) HuangOu(黄鸥) | | 城镇给排水0，，： | 1 |
| 15 | Functional transition of the rural settlement: Analysis of land-use differentiation in a transect of Beijing, China显示文摘 | Zhu Fengkai Zhang Fengrong Li Can | 2014 | Habitat international2014，41，1： | 1 |
| 16 | The bioleaching feasibility for Pb/Zn smelting slag and community characteristics of indigenous moderate-thermophilic bacteria显示文摘 | Yi Cheng Zhaohui Guo Xueduan Liu Huaqun Yin Guanzhou Qiu Fengkai Pan Hongwei Liu | 2008 | Bioresource Technology2008，，10： | 1 |
| 17 | Yiguanjian cataplasm attenuates opioid dependence in a mouse model of naloxone-induced opioid withdrawal syndrome显示文摘OBJECTIVE:To investigate the effect of Yiguanjian(YGJ) cataplasm on the development of opioid dependence in a mouse model of naloxone-induced opioid withdrawal syndrome.METHODS:One hundred Swiss albino mice,of equal male to female ratio,were randomly and equally divided into 10 groups.A portion(3 cm2) of the backside hair of the mice was removed 1 day prior to the experiment.Morphine(5 mg/kg) was intraperitoneally administered twice daily for 5days.YGJ cataplasm was prepared and pasted on the bare region of the mice immediately beforemorphine administration on day 3 and subsequently removed at the end day 5.On day 6,naloxone(8mg/kg) was intraperitoneally injected to precipitate opioid withdrawal syndrome.Behavioral observation was performed in two 30-min phases immediately after naloxone injection.RESULTS:The YGJ cataplasm significantly and dose-dependently attenuated morphine-naloxone-induced experimental opioid withdrawal,in terms of withdrawal severity score and the frequencies of jumping,rearing,forepaw licking,and circling behaviors.However,YGJ cataplasm treatment did not alter the acute analgesic effect of morphine.CONCLUSION:YGJ cataplasm could attenuate opioid dependence and its associated withdrawal symptoms.Therefore,YGJ cataplasm could serve as a potential therapy for opioid addiction in the future. | Gao Shuai Gao Hong Fan Yuchen Zhang Guanghua Sun Fengkai Zhao Jing Li Feng Yang Yang Wang Kai | 2016 | Journal of Traditional Chinese Medicine2016，36，4： | 1 |
| 18 | Optical thermometry based on near-infrared luminescence from phosphors mixture显示文摘Luminescence ratiometric thermometry based on rare earth(RE)ions has attracted great interest for the potential applications in many fields.But the improvement of the measurement sensitivity and accuracy is significantly restricted due to the small energy gap between thermally coupled levels(TCL).Here,a strategy striving for good thermometric properties of luminescent materials was designed by using the phosphors mixture composed of NaY(WO_(4))_(2):Nd^(3+)-Yb^(3+)and NaY(WO_(4))_(2):Er^(3+),which were prepared by secondary sintering method.Under the excitation of 980 nm lase r,the near-infrared(NIR)emissions(710-920 nm)from Nd^(3+)ions are effectively strengthened when the temperature increases from 304 to773 K,whereas Er^(3+)NIR luminescence centered at around 1536 nm is thermally quenched.The remarkably different response of NIR emissions to the thermal variation allows us to map temperature through the ratiometric method.By optimizing the dopant concentration of rare earth(RE)ions,a maximum sensitivity of 5.14%/K together with a measurement uncertainty of about 0.1 K is acquired at304 K,which is superior to the previously reported RE luminescence-based temperature sensors,indicating that the approach developed here can pave the way for achieving optical thermometry with desired properties. | Wei Xu Xin Zhu Di Zhao Longjiang Zheng Fengkai Shang Zhiguo Zhang | 2022 | Journal of Rare Earths2022，40，2： | 0 |
| 19 | Black phosphorus quantum dots induce myocardial inflammatory responses and metabolic disorders in mice显示文摘As an ultrasmall derivative of black phosphorus(BP)sheets,BP quantum dots(BP-QDs)have been effectively used in many fields.Currently,information on the cardiotoxicity induced by BP-QDs remains limited.We aimed to evaluate BP-QD-induced cardiac toxicity in mice.Histopathological examination of heart tissue sections was performed.Transcriptome sequencing,real-time quantitative PCR(RT–qPCR),western blotting,and enzyme-linked immunosorbent assay(ELISA)assays were used to detect the m RNA and/or protein expression of proinfammatory cytokines,nuclear factor kappa B(NF-κB),phosphatidylinositol3 kinase-protein kinase B(PI3K-AKT),peroxisome proliferator-activated receptor gamma(PPARγ),and glucose/lipid metabolism pathway-related genes.We found that heart weight and heart/body weight index(HBI)were significantly reduced in mice after intragastric administration of 0.1 or 1 mg/kg BP-QDs for 28 days.In addition,obvious infammatory cell infiltration and increased cardiomyocyte diameter were observed in the BP-QD-treated groups.Altered expression of proinfammatory cytokines and genes related to the NF-κB signaling pathway further confirmed that BP-QD exposure induced infammatory responses.In addition,BP-QD treatment also affected the PI3K-AKT,PPARγ,thermogenesis,oxidative phosphorylation,and cardiac muscle contraction signaling pathways.The expression of genes related to glucose/lipid metabolism signaling pathways was dramatically affected by BP-QD exposure,and the effect was primarily mediated by the PPAR signaling pathway.Our study provides new insights into the toxicity of BP-QDs to human health. | Chao Shen Xiaoyan Ding Jinpeng Ruan Fengkai Ruan Weiping Hu Jiyi Huang Chengyong He Yi Yu Zhenghong Zuo | 2024 | Journal of Environmental Sciences2024，，3： | 0 |
| 20 | Electronic Orbital Alignment and Hierarchical Phonon Scattering Enabling High Thermoelectric Performance p-Type Mg_(3)Sb_(2) Zintl Compounds显示文摘Environmentally friendly Mg_(3)Sb_(2)-based materials have drawn intensive attention owing to their promising thermoelectric performance.In this work,the electrical properties of p-type Mg_(3)Sb_(2) are dramatically optimized by the regulation of Mg deficiency.Then,we,for the first time,found that Zn substitution at the Mg2 site leads to the alignment of px,y and pz orbital,resulting in a high band degeneracy and the dramatically enhanced Seebeck coefficient,demonstrated by the DFT calculations and electronic properties measurement.Moreover,Zn alloying decreases Mg1(Zn)vacancies formation energy and in turn increases Mg(Zn)vacancies and optimizes the carrier concentration.Simultaneously,the Mg/Zn substitutions,Mg vacancies,and porosity structure suppress the phonon transport in a broader frequency range,leading to a low lattice thermal conductivity of~0.47 W m^(-1) K^(-1) at 773 K.Finally,a high ZT of~0.87 at 773 K was obtained for Mg_(1.95)Na_(0.01)Zn_(1)Sb_(2),exceeding most of the previously reported p-type Mg_(3)Sb_(2) compounds.Our results further demonstrate the promising prospects of p-type Mg_(3)Sb_(2)-based material in the field of mid-temperature heat recovery. | Jinsuo Hu Jianbo Zhu Fengkai Guo Haixu Qin Yijie Liu Qian Zhang Zihang Liu Wei Cai Jiehe Sui | 2022 | Research2022，，4： | 0 |
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