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| 1 | Impact of damping on high speed 850 nm VCSEL performance显示文摘High speed VCSELs are important optical devices in short-reach optical communication links and interconnects because of their low cost and high modulation speeds. In this paper, the impact of damping on the their static and dynamic characteristics is analyzed and demonstrated. Through the shallow corrosion of the top layer DBR, the VCSELs with different damping is designed and fabricated. With the increase of the surface etch depth from 0 to ~55 nm for 9 μm oxide-aperture VCSEL, the K factor related with the damping is reduced from0.31 to 0.23 ns^(-1). When the etch depth of the VCSEL with 9 μm oxide-aperture is decreased to ~25 nm,output power is increased from 4.03 to 4.70 mW and small signal modulation bandwidth is also increased from15.46 to 16.37 GHz. It shows that there is a tradeoff between damping and differential gain for improving modulation speed. | Shuai Hu Xiaoying He Yan He Jiale Su Chong Li Anqi Hu Xia Guo | 2018 | Journal of Semiconductors2018，39，11： | 2 |
| 2 | Atmospheric Particle Hygroscopicity and the Influence by Oxidation State of Organic Aerosols in Urban Beijing显示文摘A hygroscopic tandem differentialmobility analyser(H-TDMA)was used to observe the sizeresolved hygroscopic characteristics of submicron particles in January and April 2018 in urban Beijing.The probability distribution of the hygroscopic growth factor(HGF-PDF)in winter and spring usually showed a bimodal pattern,with more hygroscopic mode(MH)being more dominant.The seasonal variation in particle hygroscopicity was related to the origin of air mass,which received polluted southerly air masses in spring and clean northwesterly air masses in winter.Particles showed stronger hygroscopic behaviour during heavy pollution episodes(HPEs)with elevated concentrations of secondary aerosols,especially higher mass fraction of nitrate,which were indicated using the PM2.5(particulate matter with diameter below 2.5μm)mass concentration normalised by CO mass concentration.The hygroscopic parameter(κ)values were calculated using H-TDMA(κhtdma)and chemical composition(κchem).The closure study showed thatκchem was overestimated in winter afternoon when compared withκhtdma,because the organic particle hygroscopic parameter(κorg)was overestimated in the calculations.It was influenced by the presence of a high concentration of hydrocarbon-like organic aerosol(HOA)with a weak water uptake ability.A positive relationship was observed betweenκorg and the ratio of oxygenated organic aerosol(OOA)and HOA,thereby indicating that the strong oxidation state enhanced the hygroscopicity of the particles.This study revealed the effect of local emission sources and secondary aerosol formation processes on particle hygroscopicity,which is of great significance for understanding the pollution formation mechanism in the North China Plain. | Sinan Zhang Xiaojing Shen Junying Sun Yangmei Zhang Xiaoye Zhang Can Xia Xinyao Hu Junting Zhong Jialing Wang Shuo Liu | 2023 | Journal of Environmental Sciences2023，，2： | 1 |
| 3 | Honeycomb-like g-C_(3)N_(4)/CeO_(2)-x nanosheets obtained via one step hydrothermal-roasting for efficient and stable Cr(Ⅵ) photo-reduction显示文摘Graphitic carbon nitride(g-C_(3)N_(4))-based materials are regarded as one of the most potential photocatalysts for utilizing solar energy.In this work,we reported a facile one step in-situ hydrothermal-roasting method for preparing honeycomb-like g-C_(3)N_(4)/CeO_(2) nanosheets with abundant oxygen vacancies(g-C_(3)N_(4)/CeO_(2)-x).The hydrothermal-roasting and incomplete-sealed state can(i)generate an in-situ reducing atmosphere(CO,N2,NH3) to tune the concentration of oxygen vacancies in CeO_(2);(ii) beneficial to prevent continuous growth of g-C_(3)N_(4) and results in honeycomb-like g-C_(3)N_(4)/CeO_(2)-x hybrid nanosheets.What is more,the g-C_(3)N_(4)/CeO_(2)-x photocatalyst exhibited extended photoresponse range,increased specific surface area and obviously enhanced separation efficiency of photogenerated electron-hole pairs.As a proof-of-concept application,the optimized g-C_(3)N_(4)/CeO_(2)-xnanosheets could achieve 98% removal efficiency for Cr(Ⅵ) under visible light irradiation(λ≥420 nm)within 2.5 h,which is significantly better than those of pure g-C_(3)N_(4) and CeO_(2).This work provides a new idea for more rationally designing and constructing g-C_(3)N_(4)-based catalysts for efficient extended photochemical application. | Yanan Liu Zhangfeng Shen Jialing Song Huilan Qi Chaochuang Yin Xuhui Zou Qineng Xia Lifeng Cui Xi Li Yangang Wang | 2020 | Chinese Chemical Letters2020，31，10： | 1 |
| 4 | Audio-visual keyword transformer for unconstrained sentence-level keyword spotting显示文摘As one of the most effective methods to improve the accuracy and robustness of speech tasks,the audio-visual fusion approach has recently been introduced into the field of Keyword Spotting(KWS).However,existing audio-visual keyword spotting models are limited to detecting isolated words,while keyword spotting for unconstrained speech is still a challenging problem.To this end,an Audio-Visual Keyword Transformer(AVKT)network is proposed to spot keywords in unconstrained video clips.The authors present a transformer classifier with learnable CLS tokens to extract distinctive keyword features from the variable-length audio and visual inputs.The outputs of audio and visual branches are combined in a decision fusion module.As humans can easily notice whether a keyword appears in a sentence or not,our AVKT network can detect whether a video clip with a spoken sentence contains a pre-specified keyword.Moreover,the position of the keyword is localised in the attention map without additional position labels.Exper-imental results on the LRS2-KWS dataset and our newly collected PKU-KWS dataset show that the accuracy of AVKT exceeded 99%in clean scenes and 85%in extremely noisy conditions.The code is available at http://gffzz188fe103f8f1460asxkk05xwxcfcw69vf.ffgz.tsg.suse.edu.cn/jialeren/AVKT. | Yidi Li Jiale Ren Yawei Wang Guoquan Wang Xia Li Hong Liu | 2024 | CAAI Transactions on Intelligence Technology2024，9，1： | 0 |
| 5 | Visualization of Bulk Polymerization by Fluorescent Probe with Aggregation-induced Emission Characteristics显示文摘Bulk polymerization is one of the most commonly used techniques in polymer preparing due to its relatively simple process,low cost and easier aftertreatment of the product[1-5].Bulk polymerization has attracted much attention in both academic researches and industrial productions of commodity polymers,such as poly(methyl methacrylate)(PMMA)[6]and polystyrene(PS)[7].During the process of bulk polymerization,an autoacceleration phenomenon,which is also referred to as the gel or Trommsdorff effect,is often observed[8]. | NIU Junfeng SUN Haiya XIA Housheng ZHU Yinbang CHEN Jialing ZHU Chengye BAI Wei | 2022 | Chemical Research in Chinese Universities2022，38，2： | 0 |
| 6 | National Proficiency Testing of Molecular Diagnostics forTuberculosis and Drug Resistance Detection-China,2014-2019显示文摘Summary What is already known about this topic?Proficiency testing(PT)is a key component of qualityassurance and is essential in ensuring accuratelaboratory diagnosis of tuberculosis(TB)and drug-resistant TB.The National Tuberculosis ReferenceLaboratory(NTRL)developed a novel PT panel to testlaboratories’proficiency for molecular TB diagnosticassays throughout the TB laboratory network.A totalof 6 PT rounds for molecular diagnostics wereconducted by NTRL from 2014 to 2019. | Xichao Ou Hui Xia Shengfen Wang Bing Zhao Jiale Fan Yuanyuan Song Yang Zhou Yang Zheng Yanlin Zhao | 2021 | China CDC weekly2021，3，12： | 0 |
| 7 | Identification of oleic acid as an endogenous ligand of GPR3显示文摘Although GPR3 plays pivotal roles in both the nervous system and metabolic processes,such as cold-induced thermogenesis,its endogenous ligand remains elusive.Here,by combining structural approach(including cryo-electron microscopy),mass spectrometry analysis,and functional studies,we identify oleic acid(OA)as an endogenous ligand of GPR3.Our study reveals a hydrophobic tunnel within GPR3 that connects the extracellular side of the receptor to the middle of plasma membrane,enabling fatty acids to readily engage the receptor.Functional studies demonstrate that OA triggers downstream Gs signaling,whereas lysophospholipids fail to activate the receptor.Moreover,our research reveals that cold stimulation induces the secretion of OA in mice,subsequently activating Gs/cAMP/PKA signaling in brown adipose tissue.Notably,brown adipose tissues from Gpr3 knockout mice do not respond to OA during cold stimulation,reinforcing the significance of GPR3 in this process.Finally,we propose a“born to be activated and cold to enhance”model for GPR3 activation.Our study provides a starting framework for the understanding of GPR3 signaling in cold-stimulated thermogenesis. | Yangjie Xiong Zhenmei Xu Xinzhi Li Yuqin Wang Jing Zhao Na Wang Yaning Duan Ruixue Xia Zhengbin Han Yu Qian Jiale Liang Anqi Zhang Changyou Guo Asuka Inoue Yu Xia Zheng Chen Yuanzheng He | 2024 | Cell Research2024，34，3： | 0 |
| 8 | Wet nitrogen oxidation technology and its anisotropy influence on VCSELs显示文摘Vertical cavity surface emitting lasers(VCSELs) are widely used in optical communications and optical interconnects due to their advantages of low threshold, low power consumption and so on. Wet nitrogen oxidation technology, which utilizes H20 molecules to oxidize the Al_(0.98)Ga_(0.02)As, is used for electrical and optical mode confinement. In this paper, the effects of oxidation time, oxidation temperature and oxidation anisotropy on the oxidation rate are explored and demonstrated. The ratio of oxidation rate on [0-11] to [011] crystal orientation is defined as oxidation anisotropy coefficient, which decreases with the increase of oxidation temperature and oxidation time. In order to analyze the effect of the oxidation anisotropy on the VCSEL performance, an oxide-aperture of the VCSELs with two difference shapes is designed and then fabricated. The static performance of these fabricated VCSELs has been measured,whose threshold current ratio ~0.714 is a good agreement with that of the theoretical calculation value ~0.785. Our research on wet nitrogen oxidation and its anisotropy serves as an important reference in the batch fabrication of large-area VCSELs. | Yan He Xiaoying He Shuai Hu Jiale Su Chong Li Anqi Hu Xia Guo | 2018 | Journal of Semiconductors2018，39，12： | 0 |
| 9 | Exhaustive Exercise Does Not Affect Humoral Immunity and Protection after Rabies Vaccination in a Mouse Model显示文摘Rabies is one of the most dangerous and widespread zoonosis and is characterized by severe neurological signs and a high case-mortality rate of nearly 100%. Vaccination is the most effective way to prevent rabies in humans and animals. In this study, the relationship between exhaustive exercise and the humoral immune response after immunization with inactivated rabies vaccine was investigated in a mouse model with one-time exhaustive exercise. It was found that compared with the mice with no exercise after vaccination, no significant differences were found in those with exhaustive exercise after vaccination on body-weight changes, virus-neutralizing antibody(VNA) titers, antibody subtypes and survivor ratio after lethal rabies virus(RABV) challenge. This study indicated that exhaustive exercise does not reduce the effects of the rabies inactivated vaccine. | Lun Xia Minrui Li Yajing Zhang Juncheng Ruan Jie Pei Jiale Shi Zhen F.Fu Ling Zhao Ming Zhou Dayong Tian | 2018 | Virologica Sinica2018，33，3： | 0 |
| 10 | A review:crystalline silicon membranes over sealed cavities for pressure sensors by using silicon migration technology显示文摘A silicon pressure sensor is one of the very first MEMS components appearing in the microsystem area.The market for the MEMS pressure sensor is rapidly growing due to consumer electronic applications in recent years. Requirements of the pressure sensors with low cost, low power consumption and high accuracy drive one to develop a novel technology. This paper first overviews the historical development of the absolute pressure sensor briefly. It then reviews the state of the art technology for fabricating crystalline silicon membranes over sealed cavities by using the silicon migration technology in detail. By using only one lithographic step, the membranes defined in lateral and vertical dimensions can be realized by the technology. Finally, applications of MEMS through using the silicon migration technology are summarized. | Jiale Su Xinwei Zhang Guoping Zhou Changfeng Xia Wuqing Zhou Qing'an Huang | 2018 | Journal of Semiconductors2018，39，7： | 0 |
| 11 | Non-fused medium bandgap electron acceptors for efficient organic photovoltaics显示文摘The cost-effective organic semiconductors are strongly needed in organic photovoltaics(OPVs). Herein,two medium bandgap(MBG) electron acceptors, TPT4F and TPT4Cl are developed via the new design of multi-noncovalent interaction assisted unfused core, flanked with two electron withdrawing end groups. These fullly non-fused MBG acceptors adapt the planar and rigid conformation in solid, therefore exhibiting the ordered face-on stacking and strong photoluminescence in films. As results, TPT4Cl^(-)based OPVs, upon blending with the PBDB-TF polymer donor, have achieved a power conversion efficiency of 10.16% with a low non-radiative loss of 0.27 e V, representing one of the best fullly non-fused medium bandgap acceptors with desirable cost-efficiency balance. | Tian-Jiao Wen Jiale Xiang Nakul Jain Zhi-Xi Liu Zeng Chen Xinxin Xia Xinhui Lu Haiming Zhu Feng Gao Chang-Zhi Li | 2022 | Journal of Energy Chemistry2022，31，7： | 0 |
| 12 | Terahertz beats of vibrational modes in methanol and ethanol selectively excited by tr-CARS technique显示文摘A recently developed time-resolved coherent anti-Stokes Raman scattering(tr-CARS) technique allows the measurement of vibrational coherences with high frequency differences with the ambient environment.The method is based on the short spatial extension of femtosecond pulses with a broadband tunable nonlinear optical parametric amplifier(NOPA) and an internal time delay between the probe and pump/Stokes pulse pair in the CARS process.The different beat frequencies between Raman modes can be selectively detected as oscillations in the tr-CARS transient signal with the broadband tunable NOPA.In this work,we aim at the Raman C-H stretching vibrations from 2800 cm 1 to 3000 cm 1,within which the different vibrational modes in both ethanol and methanol are selectively excited and simultaneously detected.The high time resolution of the experimental set-up allows one to monitor the vibrational coherence dynamics and to observe the quantum beat phenomena on a terahertz scale.This investigation indicates that the femtosecond tr-CARS technique is a powerful tool for the real-time monitoring and detection of molecular and biological agents,including airborne contaminants such as bacterial spores,viruses and their toxins. | HE Ping WANG HuiLi FAN RongWei CHEN DeYing XIA YuanQin YU Xin WANG JiaLing JIANG YuGang | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，12： | 0 |
| 13 | Multimodal channel cancer chemotherapy by 2D functional gadolinium metal-organic framework显示文摘2D nanomaterials generally exhibit enhanced physiochemical and biological functions in biomedical applications due to their high surface-to-volume ratio and surface charge.Conventional cancer chemotherapy based on nanomaterials has been hindered by their low drug loading and poor penetration in tumor tissue.To overcome these difficulties,novel materials systems are urgently needed.Hereby,the lanthanide-based porphyrin metal-organic framework(MOF)nanosheets(NSs)with promising cancer imaging/chemotherapy capacities are fabricated,which display superior performance in the drug loading and tumor tissue penetration.The biodegradable PPF-Gd NSs deliver an ultrahigh drug loading(>1500%)and demonstrate the stable and highly sensitive stimuli-responsive degradation/release for multimodal tumor imaging and cancer chemotherapy.Meanwhile,PPF-Gd NSs also exhibit excellent fluorescence and magnetic resonance imaging capability in vitro and in vivo.Compared to the traditional doxorubicin(DOX)chemotherapy,the in vivo results confirm the evident suppression of the tumor growth by the PPF-Gd/DOX drug delivery system with negligible side effects.This work further supports the potential of lanthanide-based MOF nanomaterials as biodegradable systems to promote the cancer theranostics technology development in the future. | Jiale Xia Yumeng Xue Bo Lei Lingling Xu Mingzi Sun Na Li Hongyang Zhao Min Wang Meng Luo Chao Zhang Bolong Huang Yaping Du Chun-Hua Yan | 2021 | National Science Review2021，8，7： | 0 |
| 14 | Enhancement of dual-broadband NIR emissions in Ag NPs embedded tellurite glass doped with Er^(3+)/Tm^(3+)/Ho^(3+) ions显示文摘Tellurite glasses combined with metal silver nanoparticles(Ag NPs) and Er^(3+)/Tm^(3+)/Ho^(3+) ions were synthesized using melting and quenching technique, and the enhanced two-band near-infrared(NIR) fluorescence induced by Ag NPs was reported. Upon the excitation of 808 nm laser diode(LD), dual-broadband and flat NIR fluorescence ranging from 1 350 nm to 1 600 nm and from 1 600 nm to 2 200 nm with full width at half maximum(FWHM) of 154 nm and 374 nm respectively in Ag NPs embedded tellurite glass doped with appropriate concentrations of Er^(3+)/Tm^(3+)/Ho^(3+) ions has an obvious enhancement of about 40% with respect to the glass sample without Ag NPs, which is attributed to the local field effect caused by Ag NPs and energy transfer from Ag species to rare-earth ions. The enhanced dual-broadband and flat NIR fluorescence enables us to develop various NIR band photonic devices flexibly. | LI Chengyan DING Jiale XIA Lizhang ZHANG Yu ZHOU Yaxun | 2022 | Optoelectronics Letters2022，18，11： | 0 |
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