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| 1 | Analysis of the Effects of Slope Geometry on the Dynamic Response of a Near-field Mountain from the Wenchuan Earthquake显示文摘Fourier spectra and acceleration response spectra of near-field acceleration records of the 2008 Wenchuan Earthquake have been calculated.Relative fundamental frequencies(or predominant periods) were characterized.Then,the natural frequencies of a range of slopes with different geometric characteristics,such as height,slope ratio,and pattern,were analyzed.The seismic responses of the slopes were compared,and the variability of seismic response with the above geometric elements was found.Results show that if slope height increases,and provided that other conditions are unchanged,the natural frequency of the first mode of a doublesurface slope will change as a power law.However,natural frequencies will diminish(based on a parabolic function) as the slope angle becomes large.Both the surface pattern and the number of surfaces on a slope can have a great impact on the seismic response of the slope.Moreover,within a certain range of slope heights or angles,either height or angle will also greatly influence the variability of the seismic response.The results of this research will be helpful to understanding seismic dynamic response features and explaining the ways that slope stability can be affected by earthquakes. | XIAO Shiguo FENG Wenkai ZHANG Jianjing | 2010 | Journal of Mountain Science2010，7，4： | 7 |
| 2 | Gapless indica rice genome reveals synergistic contributions of active transposable elements and segmental duplications to rice genome evolution显示文摘The ultimate goal of genome assembly is a high-accuracy gapless genome.Here,we report a new assembly pipeline that is used to produce a gapless genome for the indica rice cultivar Minghui 63.The resulting 397.71-Mb final assembly is composed of 12 contigs with a contig N50 size of 31.93 Mb.Each chromosome is represented by a single contig and the genomic sequences of all chromosomes are gapless.Quality evaluation of this gapless genome assembly showed that gene regions in our assembly have the highest completeness compared with the other 15 reported high-quality rice genomes.Further comparison with the japonica rice genome revealed that the gapless indica genome assembly contains more transposable elements(TEs)and segmental duplications(SDs),the latter of which produce many duplicated genes that can affect agronomic traits through dose effect or sub-/neo-functionalization.The insertion of TEs can also affect the expression of duplicated genes,which may drive the evolution of these genes.Furthermore,we found the expansion of nucleotide-binding site with leucine-rich repeat disease-resistance genes and cis-zeatin-O-glucosyltransferase growth-related genes in SDs in the gapless indica genome assembly,suggesting that SDs contribute to the adaptive evolution of rice disease resistance and developmental processes.Collectively,our findings suggest that active TEs and SDs synergistically contribute to rice genome evolution. | Kui Li Wenkai Jiang Yuanyuan Hui Mengjuan Kong Li-Ying Feng Li-Zhi Gao Pengfu Li Shan Lu | 2021 | Molecular Plant2021，14，10： | 6 |
| 3 | Side-chain modification of polyethylene glycol on conjugated polymers for ternary blend all-polymer solar cells with efficiency up to 9.27%显示文摘With the rapid progress achieved by all-polymer solar cells(all-PSCs), wide-bandgap copolymers have attracted intensive attention for their unique advantage of constructing complementary absorption profiles with conventional narrow-bandgap copolymers. In this work, we designed and synthesized a wide bandgap ternary copolymer PEG-2% which has the benzodithiophene-alt-difluorobenzotriazole as the backbone and the polyethylene glycol(PEG) modified side chain. The PBTA-PEG-2%:N2200 can be processed with a non-chlorinated solvent of 2-methyl-tetrahydrofuran(MeTHF) for the binary all-PSC, which exhibits a moderate photovoltaic performance. In particular, the ternary all-PSCs that consisting an additional narrow bandgap polymer donor PTB7-Th can also be processed with MeTHF, resulting in an unprecedented power conversion efficiency(PCE)of 9.27%, and a high PCE of 8.05% can be achieved with active layer thickness of 240 nm, both of which are the highest values so far reported from all-PSCs. Detailed investigations revealed that the dramatically improved device performances are attributable to the well-extended absorption band in the photoactive layer. Hence,developing novel copolymers with tailored side chains, and introducing additional polymeric components, can broaden the horizon for high-performance all-PSCs. | Zhenye Li Baobing Fan Baitian He Lei Ying Wenkai Zhong Feng Liu Fei Huang Yong Cao | 2018 | Science China Chemistry2018，61，4： | 4 |
| 4 | Polydopamine and collagen coated micro-grated polydimethylsiloxane for human mesenchymal stem cell culture显示文摘Natural tissues contain highly organized cellular architecture.One of the major challenges in tissue engineering is to develop engineered tissue constructs that promote cellular growth in physiological directionality.To address this issue,micro-patterned polydimethylsiloxane(PDMS)substrates have been widely used in cell sheet engineering due to their low microfabrication cost,higher stability,excellent biocompatibility,and most importantly,ability to guide cellular growth and patterning.However,the current methods for PDMS surface modification either require a complicated procedure or generate a non-uniform surface coating,leading to the production of poor-quality cell layers.A simple and efficient surface coating method is critically needed to improve the uniformity and quality of the generated cell layers.Herein,a fast,simple and inexpensive surface coating method was analyzed for its ability to uniformly coat polydopamine(PD)with or without collagen on micro-grated PDMS substrates without altering essential surface topographical features.Topographical feature,stiffness and cytotoxicity of these PD and/or collagen based surface coatings were further analyzed.Results showed that the PD-based coating method facilitated aligned and uniform cell growth,therefore holds great promise for cell sheet engineering as well as completely biological tissue biomanufacturing. | Dhavan Sharma Wenkai Jia Fei Long Shweta Pati Qinghui Chen Yibing Qyang Bruce Lee Chang Kyong Choi Feng Zhao | 2019 | Bioactive Materials2019，4，1： | 4 |
| 5 | Bioactive polydimethylsiloxane surface for optimal human mesenchymal stem cell sheet culture显示文摘Human mesenchymal stem cell(hMSC)sheets hold great potential in engineering three-dimensional(3D)completely biological tissues for diverse applications.Conventional cell sheet culturing methods employing thermoresponsive surfaces are cost ineffective,and rely heavily on available facilities.In this study,a cost-effective method of layer-by-layer grafting was utilized for covalently binding a homogenous collagen I layer on a commonly used polydimethylsiloxane(PDMS)substrate surface in order to improve its cell adhesion as well as the uniformity of the resulting hMSC cell sheet.Results showed that a homogenous collagen I layer was obtained via this grafting method,which improved hMSC adhesion and attachment through reliable collagen I binding sites.By utilizing this low-cost method,a uniform hMSC sheet was generated.This technology potentially allows for mass production of hMSC sheets to fulfill the demand of thick hMSC constructs for tissue engineering and biomanufacturing applications. | Zichen Qian David Ross Wenkai Jia Qi Xing Feng Zhao | 2018 | Bioactive Materials2018，3，2： | 2 |
| 6 | Femtosecond infrared optical vortex lasers based on optical parametric amplification显示文摘Infrared femtosecond optical vortices open up many new research fields,such as optical micro–nano manipulation,time-resolved nonlocal spectroscopy in solids,vortex secondary radiation and particle generations.In this article,we demonstrate a femtosecond optical vortex laser system based on a two-stage optical parametric amplifier.In our experiment,1.45µm vortex signal pulses with energy of 190µJ and 1.8µm vortex idler pulses with energy of 158µJ have been obtained,and the pulse durations are 51 and 48 fs,respectively.Both the energy fluctuations of the signal and idler pulses are less than 0.5%(root mean square),and the spectral fluctuations are less than 1.5%within 1 hour.This type of highly stable femtosecond optical vortex laser has a wide range of applications for vortex strong-field physics. | Renyu Feng Junyu Qian Yujie Peng Yanyan Li Wenkai Li Yuxin Leng Ruxin Li | 2022 | High Power Laser Science and Engineering2022，10，5： | 1 |
| 7 | Improving photovoltaic parameters of all-polymer solar cells through integrating two polymeric donors显示文摘The incorporation of an additional component into the bulk-heterojunction light-harvesting layer of polymer solar cells has been considered as an effective strategy to enhance photovoltaic performance.Here we demonstrated that the photovoltaic parameters of all-polymer solar cells could be enhanced upon replacing a certain ratio of electron-donating polymer PTz BI-o F with a widely used wide-bandgap polymer donor PM6.The photoluminescent characterizations confirmed the F?rster resonance energy transfer from incorporated PM6 to PTz BI-o F.Moreover,the combination of Fourier-transform photocurrent spectroscopy and electroluminescence external quantum efficiencies measurements demonstrated reduced non-radiative recombination energy loss upon the incorporation of PM6,resulting in a slightly enhanced open-circuit voltage of 0.88 V of the ternary cell regarding the binary PTz BI-o F:PFA1 device.The optimized ternary blend devices comprising of PTz BI-o F:PM6:PFA1 presented an impressively high power conversion efficiency of 16.3%,and the efficiency remains 15%on a device with an enlarged effective area of 1 cm^(2),demonstrating the great potential of these all-PSCs for potential applications. | Kang An Feng Peng Wenkai Zhong Wanyuan Deng Difei Zhang Lei Ying Hongbin Wu Fei Huang Yong Cao | 2021 | Science China Chemistry2021，64，11： | 1 |
| 8 | A novel long-term intravenous combined with local treatment with human amnion-derived mesenchymal stem cells for a multidisciplinary rescued uremic calciphylaxis patient and the underlying mechanism显示文摘Calciphylaxis is a rare disease characterized histologically by microvessel calcification and microthrombosis,with high mortality and no proven therapy.Here,we reported a severe uremic calciphylaxis patient with progressive skin ischemia,large areas of painful malodorous ulcers,and mummified legs.Because of the worsening symptoms and signs refractory to conventional therapies,treatment with human amnion-derived mesenchymal stem cells(hAMSCs)was approved.Preclinical release inspections of hAMSCs,efficacy,and safety assessment,including cytokine secretory ability,immunocompetence,tumorigenicity,and genetics analysis in vitro,were introduced.We further performed acute and long-term hAMSC toxicity evaluations in C57BL/6 mice and rats,abnormal immune response tests in C57BL/6 mice,and tumorigenicity tests in neonatal Balbc-nu nude mice.After the preclinical research,the patient was treated with hAMSCs by intravenous and local intramuscular injection and external supernatant application to the ulcers.When followed up to 15 months,the blood-based markers of bone and mineral metabolism improved,with skin soft tissue regeneration and a more favorable profile of peripheral blood mononuclear cells.Skin biopsy after 1-month treatment showed vascular regeneration with mature noncalcified vessels within the dermis,and 20 months later,the re-epithelialization restored the integrity of the damaged site.No infusion or local treatment-related adverse events occurred.Thus,this novel long-term intravenous combined with local treatment with hAMSCs warrants further investigation as a potential regenerative treatment for uremic calciphylaxis due to effects of inhibiting vascular calcification,stimulating angiogenesis and myogenesis,anti-inflammatory and immune modulation,multidifferentiation,re-epithelialization,and restoration of integrity. | Lianju Qin Jing Zhang Yujie Xiao Kang Liu Yugui Cui Fangyan Xu Wenkai Ren Yanggang Yuan Chunyan Jiang Song Ning Xiaoxue Ye Ming Zeng Hanyang Qian Anning Bian Fan Li Guang Yang Shaowen Tang Zhihong Zhang Juncheng Dai Jing Guo Qiang Wang Bin Sun Yifei Ge Chun Ouyang Xueqiang Xu Jing Wang Yaoyu Huang Hongqing Cui Jing Zhou Meilian Wang Zhonglan Su Yan Lu Di Wu Jingping Shi Wei Liu Li Dong Yinbing Pan Baiqiao Zhao Ying Cui Xueyan Gao Zhanhui Gao Xiang Ma Aiqin Chen Jie Wang Meng Cao Qian Cui Li Chen Feng Chen Youjia Yu Qiang Ji Zhiwei Zhang Mufeng Gu Xiaojun Zhuang Xiaolin Lv Hui Wang Yanyan Pan Ling Wang Xianrong Xu Jing Zhao Xiuqin Wang Cuiping Liu Ningxia Liang Changying Xing Jiayin Liu Ningning Wang | 2022 | Journal of Molecular Cell Biology2022，14，2： | 1 |
| 9 | Automatic Detection of Weld Defects in Pressure Vessel X-Ray Image Based on CNN显示文摘The visual automatic detection method based on artificial intelligence has attracted more and more attention. In order to improve the performance of weld nondestructive defect detection,we propose DRepDet(Dilated RepPoints Detector). First, we analyze the weld defect dataset in detail and summarize the distribution characteristics of weld defect data, that is, the defect scale is very different and the aspect ratio distribution range is large. Second, according to the distribution characteristics of defect data, we design DResBlock module, and introduce dilated convolution with different dilated rates in the process of feature extraction to expand the receptive field and improve the detection performance of large-scale defects. Based on DResBlock and anchor-free detection framework RepPoints, we design DRepDet. Extensive experiments show that our proposed detector can detect 7 types of defects. When using combined dilated rate convolution network in detection, the AP50 and Recall50 of big defects are improved by 3.1% and 3.3% respectively, while the performance of small defects is not affected, almost the same or slightly improved. The final performance of the whole network is improved a large margin,with 6% AP50 and 4.2% Recall50 compared with Cascade RCNN and 1.4% AP50 and 2.9% Recall50 compared with RepPoints. | XIAO Wenkai FENG Xiang NAN Shuiyu ZHANG Linlin | 2022 | Wuhan University Journal of Natural Sciences2022，27，6： | 0 |
| 10 | Design Rules of the Mixing Phase and Impacts on Device Performance in High-Efficiency Organic Photovoltaics显示文摘In nonfullerene acceptor-(NFA-)based solar cells,the exciton splitting takes place at both domain interface and donor/acceptor mixture,which brings in the state of mixing phase into focus.The energetics and morphology are key parameters dictating the charge generation,diffusion,and recombination.It is revealed that tailoringthe electronic properties of the mixing region by doping with larger-bandgap components could reduce the density of state but elevate the filling state level,leading to improved open-circuit voltage(V_(OC))and reduced recombination.The monomolecular and bimolecular recombinations are shown to be intercorrelated,which show a Gaussian-like relationship with V_(OC) and linear relationship with short-circuit current density(JSC)and fill factor(FF).The kinetics of hole transfer and exciton diffusion scale with JSC similarly,indicating the carrier generation in mixing region and crystalline domain are equally important.From the morphology perspective,the crystalline order could contribute to V_(OC) improvement,and the fibrillar structure strongly affects the FF.These observations highlight the importance of the mixing region and its connection with crystalline domains and point out the design rules to optimize the mixing phase structure,which is an effective approach to further improve device performance. | Jingnan Song Ming Zhang Tianyu Hao Jun Yan Lei Zhu Guanqing Zhou Rui Zeng Wenkai Zhong Jinqiu Xu Zichun Zhou Xiaonan Xue Chun-Chao Chen Weihua Tang Haiming Zhu Zaifei Ma Zheng Tang Yongming Zhang Feng Liu | 2022 | Research2022，，4： | 0 |
| 11 | Intense ultraviolet-visible-infrared full-spectrum laser显示文摘A high-brightness ultrabroadband supercontinuum white laser is desirable for various fields of modern science.Here,we present an intense ultraviolet-visible-infrared full-spectrum femtosecond laser source(with 300–5000 nm 25 dB bandwidth)with 0.54 mJ per pulse.The laser is obtained by sending a 3.9μm,3.3 mJ mid-infrared pump pulse into a cascaded architecture of gas-filled hollow-core fiber,a bare lithium niobate crystal plate,and a specially designed chirped periodically poled lithium niobate crystal,under the synergic action of second and third order nonlinearities such as high harmonic generation and self-phase modulation.This full-spectrum femtosecond laser source can provide a revolutionary tool for optical spectroscopy and find potential applications in physics,chemistry,biology,material science,industrial processing,and environment monitoring. | Lihong Hong Liqiang Liu Yuanyuan Liu Junyu Qian Renyu Feng Wenkai Li Yanyan Li Yujie Peng Yuxin Leng Ruxin Li Zhi-Yuan Li | 2023 | Light(Science & Applications)2023，12，9： | 0 |
| 12 | Optimizing the morphology of all-polymer solar cells for enhanced photovoltaic performance and thermal stability显示文摘Due to the complicated film formation kinetics, morphology control remains a major challenge for the development of efficient and stable all-polymer solar cells(all-PSCs). To overcome this obstacle, the sequential deposition method is used to fabricate the photoactive layers of all-PSCs comprising a polymer donor PTzBI-oF and a polymer acceptor PS1. The film morphology can be manipulated by incorporating amounts of a dibenzyl ether additive into the PS1 layer. Detailed morphology investigations by grazing incidence wide-angle X-ray scattering and a transmission electron microscope reveal that the combination merits of sequential deposition and DBE additive can render favorable crystalline properties as well as phase separation for PTzBI-oF:PS1 blends. Consequently, the optimized all-PSCs delivered an enhanced power conversion efficiency(PCE) of 15.21%along with improved carrier extraction and suppressed charge recombination. More importantly, the optimized all-PSCs remain over 90% of their initial PCEs under continuous thermal stress at 65 °C for over 500 h. This work validates that control over microstructure morphology via a sequential deposition process is a promising strategy for fabricating highly efficient and stable all-PSCs. | Kang An Wenkai Zhong Chunguang Zhu Feng Peng Lei Xu Zhiwei Lin Lei Wang Cheng Zhou Lei Ying Ning Li Fei Huang | 2023 | Journal of Semiconductors2023，44，5： | 0 |
| 13 | A Simple Nonfused Ring Electron Acceptor with a Power Conversion Efficiency over 16%显示文摘By simplifying the r-bridge unit,a nonfused ring electron acceptor(NFREA)BM-2F was designed and synthesized with several high-yield steps.The specific molecular structure features of BM-2F are planar molecular backbone and out-of-plane side chain,which is favorable for charge transport and can suppress the over-aggregation.BM-2F based neat and blend films display obvious face-on molecular orientation.Specially,D18:BM-2F based blend film can form good bicontinuous interpenetrating network.More excitingly,a power conversion efficiency of 16.15%was achieved with D18:BM-2F based photovoltaic devices,which is the highest one based on NFREAs.Our researches manifest that NFREA is a promising direction for low-cost and high-performance organic solar cells. | Xiaodong Wang Rui Zeng Hao Lu Guangliu Ran Andong Zhang Ya-Nan Chen Yahui Liu Feng Liu Wenkai Zhang Zheng Tang Zhishan Bo | 2023 | Chinese Journal of Chemistry2023，41，6： | 0 |
| 14 | The structure-performance correlation of bulk-heterojunction organic solar cells with multi-length-scale morphology显示文摘We build a general multi-length-scale morphology model with mixing phase and pure phase fibril structure,and simulate corresponding organic solar cells performance.Systematical multi-length-scale morphology optimization process by changing the proportion of mixing phase and pure phase in different period width cases shows a clear correlation between period width and device performance that a smaller period width with appropriate proportion of mixing phase and fibril structure is advantageous to achieve high-performance devices.Experiments on multiple donor/acceptor blends have been carried out by varying the composition and processing condition,which afford good structure-performance correlation that supports the model prediction.It is demonstrated that building such a multi-length-scale morphology merging the synergistic effects of mixing and pure phases is indeed an imperative avenue to improve device efficiency. | Tianyu Hao Wenkai Zhong Shifeng Leng Rui Zeng Ming Zhang Lei Zhu Yankang Yang Jingnan Song Jinqiu Xu Guanqing Zhou Yecheng Zou Yongming Zhang Feng Liu | 2022 | Science China Chemistry2022，65，8： | 0 |
| 15 | Interface bond degradation and damage characteristics of full-length grouted rock bolt in tunnels with high temperature显示文摘Full-length grouted bolts play a crucial role in geotechnical engineering thanks to their excellent stability.However,few studies have been concerned with the degrading performance of grouted rock bolts caused by extensive and continuous heat conduction from surrounding rocks in high-geothermal tunnels buried more than 100 m(temperature from 28C to 100C).To investigate the damage mechanism,we examined the time-varying behaviors of grouted rock bolts in both constant and variable temperature curing environments and their damage due to the coupling effects of high temperature and humidity through mechanical and micro-feature tests,including uniaxial compression test,pull-out test,computed tomography(CT)scans,X-ray diffraction(XRD)test,thermogravimetric analysis(TGA),etc.,and further analyzed the relationship between grout properties and anchorage capability.In order to facilitate a rapid assessment and control of the anchorage performance of anchors in different conditions,results of the interface bond degradation tests were correlated to environment parameters based on the damage model of interfacial bond stress proposed.Accordingly,a thermal hazard classification criterion for anchorage design in high-geothermal tunnels was suggested.Based on the reported results,although high temperature accelerated the early-stage hydration reaction of grouting materials,it affected the distribution and quantity of hydration products by inhibiting hydration degree,thus causing mechanical damage to the anchorage system.There was a significant positive correlation between the strength of the grouting material and the anchoring force.Influenced by the changes in grout properties,three failure patterns of rock bolts typically existed.Applying a hot-wet curing regime results in less reduction in anchorage force compared to the hot-dry curing conditions.The findings of this study would contribute to the design and investigations of grouted rock bolts in high-geothermal tunnels. | Yunpeng Hu Mingming Zheng Wenkai Feng Jianjun Tong Yicheng Wang Qiling Wang Kan Liu Longzhen Ye | 2023 | Journal of Rock Mechanics and Geotechnical Engineering2023，15，10： | 0 |
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