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Design of advanced porous silver powder with high-sintering activity to improve silicon solar cells

Nano Research 2024年第4期17卷 3189-3197页

作者： Yongsheng Li Ziwei Chen Rui Zhou Wenguang zhao Mu Li Jun Chen Zhongyuan Huang Jian Liu Yuhang Li Maolin Yang Minghan Yu Dong Zhou Yuan Lin Feng Pan School of Advanced Materials Peking UniversityShenzhen Graduate SchoolShenzhen 518055China Institute of Advanced Science Facilities Shenzhen 518107China Institute of Zhejiang University-Quzhou Quzhou 324000China Key Laboratory of Photochemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190China Institute of Materials Research(IMR) Tsinghua UniversityTsinghua Shenzhen International Graduate SchoolShenzhen 518055China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Silver(Ag)paste is widely used in semiconductor metallization,especially in silicon solar *** powder is the material with the highest proportion in Ag *** morphology and structure of Ag powder are crucial which determine its characteristics,especially for the sintering *** this work,a simple method was developed to synthesize a type of microcrystalline spherical Ag particles(SP-A)with internal pores and the structural changes and sintering behavior were thoroughly studied by combining ultra-small-angle X-ray scattering(USAXS),small-angle X-ray scattering(SAXS),in-situ heating X-ray diffraction(XRD),focused ion beam(FIB),and thermal analysis *** to the unique internal pores,the grain size of SP-A is smaller,and the coefficient of thermal expansion(CTE)is higher than that of traditional solid Ag *** a result,the sintering activity of SP-A is excellent,which can form a denser sintered body and form silver nanoparticles at the Ag–Si interface to improve silver silicon *** silicon solar cell built with SP-A obtained a low series resistance(Rs)and a high photoelectric conversion efficiency(PCE)of 19.26%.These fill a gap in Ag particle structure research,which is significant for the development of high-performance electronic Ag particles and efficient semiconductor devices.

关键词： silver particles small angle X-ray scattering(SAXS) pore size distribution in-situ heating X-ray diffraction(XRD) sintering silicon solar cells

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Lysine-specific Demethylase 1 Represses THP-1 Monocyte-to-macrophage Differentiation

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Chinese Medical Sciences Journal 2013年第2期28卷 82-87页

作者： Rui-feng Yang Guo-wei zhao Shu-ting Liang Hou-zao Chen De-pei Liu National Laboratory of Medical Molecular Biology Institute of Basic Medical SciencesChinese Academy of Medical Sciences & Peking Union Medical College

Objective To investigate the role of lysine-specific demethylase 1 （LSD1） in the process of THP-1 monocyte-to-macrophage differentiation. Methods Quantitative reverse transcription-polymerase chain reaction （qRT-PCR） and Western blotting were performed to analyze the expression of LSD1 and interleukin-6 （IL-6） in THP-1 monocytes and THP-l-derived macrophages. Chromatin immunoprecipitation （ChiP） assay was applied to detect the occupancy of LSD1 and H3K4 methylation at IL-6 promoter during THP-1 monocyte-to-macrophage differentiation. IL-6 mRNA level and H3K4 methylation at IL-6 promoter were analyzed using qRT-PCR and ChiP assay in LSD 1 -knockdown THP- 1 cells treated with 12-O-tetradecanoylphorbol- 13-acetate （TPA） for 0 4, 8, 12, and 24 hours. Fluorescence activated flow cytometry was performed to reveal the percentage of macrophages differentiated from THP- 1 monocytes. Results The expression of LSD1 reduced during THP-1 monocyte-to-macrophage differentiation （P〈0.01）. LSD1 occupancy decreased and H3K4 methylation increased at IL-6 promoter during the differentiation. With knockdown of LSD1, H3K4 methylation at IL-6 promoter was found increased after TPA treatment at different times points （all P〈0.05, except 24 hours）. The percentage of macrophages increased significantly in theTHP-I cells with LSD1 knockdown （P〈0.05）. Conclusions LSD1 is repressed during the monocyte-to-macrophage differentiation of THP-1 cells. Suppression of LSD 1-mediated H3K4 demethylation may be required for THP-1 monocyte-to-macrophage differentiation.

关键词： lysine-specific demethylase 1 interleukin-6 H3K4 methylation monocyte-to-macrophage differentiation

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产γ-氨基丁酸乳杆菌高效筛选方法的建立

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中国乳品工业 2024年第4期52卷 34-37,49页

作者：范城飞翟征远王然郝彦玲孙婷马霞刘福东赵雯洪维錬中国农业大学食品科学与营养工程学院北京100083 中国农业大学营养与健康系北京100193 内蒙古乳业技术研究院有限责任公司呼和浩特010110 内蒙古伊利实业集团股份有限公司呼和浩特010110

本研究首先发现11株短乳杆菌皆产生大量气体导致培养管盖子弹起,进一步对48 h发酵液pH进行测定,发现有3株菌的发酵液具有较高pH,薄层层析结果表明产生大量气体且发酵液pH较高的菌株能够产生γ-氨基丁酸(GABA),进一步通过质谱实验验证,... 详细信息

本研究首先发现11株短乳杆菌皆产生大量气体导致培养管盖子弹起,进一步对48 h发酵液pH进行测定,发现有3株菌的发酵液具有较高pH,薄层层析结果表明产生大量气体且发酵液pH较高的菌株能够产生γ-氨基丁酸(GABA),进一步通过质谱实验验证,产量分别是124.14、203.00、211.50 mg/L。通过高效测序发现11株短乳杆菌GABA合成基因簇结构和核酸序列基本相同,因此在基因层面无法实现高效筛选。根据GABA生物合成过程中产生二氧化碳及消耗氢离子的现象建立高效筛选方法。进一步对220株植物乳杆菌进行产气观察结合pH测定判定菌株是否产GABA,并通过薄层色谱进行验证,表明此方法可行。该方法具有低成本高效的特点,能够快速从大量乳杆菌中筛选出产GABA菌株。

关键词： γ-氨基丁酸乳杆菌高效

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Comprehensive reutilization of herbal waste:Coproduction of magnolol,honokiol,and β-amyrin from Magnolia officinalis residue

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Green Energy & Environment 2024年第2期9卷 403-412页

作者： Lukun Xiao Anyi zhao Jie Qiu An Liu Sha Chen Jinzhu Jiang Jun Zhang Cong Guo Jipeng Di Jintang Cheng Chang Chen Kangxin Hou Aiping Zhang Yan Liu Caixia Wang Institute of Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing100700China School of Pharmacy Shanxi Medical UniversityTaiyuan030001China

Herbal extraction residues(HERs)cause serious environmental pollution and resource *** this study,a novel green route was designed for the comprehensive reutilization of all components in HERs,taking Magnolia officinalis residues(MOR)as an *** reluctant structure of MOR was first destroyed by alkali pretreatment to release the functional ingredients(magnolol and honokiol)originally remaining in MOR and to make MOR more accessible for hydrolysis.A metal–organic frame material MIL-101(Cr)with a maximum absorption capacity of 255.64 mg g^(-1)was synthesized to absorb the released honokiol and magnolol from the pretreated MOR solutions,and 40 g L^(-1)reducing sugars were obtained with 81.8%enzymatic hydrolysis rate at 10%MOR solid ***,382 mg L-1β-amyrin was produced from MOR hydrolysates by an engineered yeast *** total,1 kg honokiol,8 kg magnolol,and 7.64 kg β-amyrin could produce from 1 ton MOR by this cleaner process with a total economic output of 170,700 RMB.

关键词： Magnolia officinalis residues(MOR) Comprehensive utilization Metal-organic frame material Biosynthesis

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Spatial transcriptomics:recent developments and insights in respiratory research

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Military Medical Research 2024年第3期11卷 430-448页

作者： Wen-Jia Wang Liu-Xi Chu Li-Yong He Ming-Jing Zhang Kai-Tong Dang Chen Gao Qin-Yu Ge Zhou-Guang Wang Xiang-Wei zhao State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhou 325035ZhejiangChina Orthopaedic Bioengineering Research Group Division of Surgery and Interventional ScienceUniversity College LondonLondon HA74LPUK

The respiratory system's complex cellular heterogeneity presents unique challenges to researchers in this *** bulk RNA sequencing and single-cell RNA sequencing(scRNA-seq)have provided insights into cell types and heterogeneity in the respiratory system,the relevant specific spatial localization and cellular interactions have not been clearly *** transcriptomics(ST)has filled this gap and has been widely used in respiratory *** review focuses on the latest iterative technology of ST in recent years,summarizing how ST can be applied to the physiological and pathological processes of the respiratory system,with emphasis on the ***,the current challenges and potential development directions are proposed,including high-throughput full-length transcriptome,integration of multi-omics,temporal and spatial omics,bioinformatics analysis,*** viewpoints are expected to advance the study of systematic mechanisms,including respiratory studies.

关键词： Spatial transcriptomics Lung Tumor Spatial multi-omics

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Controlled fabrication of Fe_(3)N@NG composites as superior oxygen evolution reaction electrocatalysts

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Carbon Resources Conversion 2024年第2期7卷 13-16页

作者： Yang Song Tongya Tian Changming Li Xi Zeng Sen Zhang Li Chen Zhenghua Yang Qizhe Ji Xianglong zhao Feiyong Chen Resources and Environment Innovation Institute Shandong Jianzhu UniversityJinan 250101PR China School of Science Shandong Jianzhu UniversityJinan 250101PR China Huzhou Nanxun District Jianda Ecological Environment Innovation Center Shandong Jianzhu UniversityHuzhouZhejiang 313009PR China State Environmental Protection Key Laboratory of Food Chain Pollution Control Beijing Technology and Business UniversityBeijing 100048PR China

We report the controlled fabrication of nitrogen doped graphene(NG)nanoplates,which are uniformly decorated with iron nitride(Fe_(3)N)nanoparticles,via ball milling of mixtures of graphite and iron nitrates and the following ammonia *** obtained Fe_(3)N@NG composites demonstrate excellent electrocatalytic activity and durability for oxygen evolution reaction,both of which outperform those of the state-of-the-art iridium oxide *** may be attributed to nitrogen doping as well as the synergistic effect between Fe3N and graphene nanoplates.

关键词： Graphene Iron nitrides Ball milling Oxygen evolution reaction Electrocatalysts

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Ultrafast laser processing of silk films by bulging and ablation for optical functional devices

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Light(Advanced Manufacturing) 2024年第3期5卷 28-38页

作者： Ming Qiao Huimin Wang Heng Guo Ma Luo Yuzhi zhao Haoze Han Jianfeng Yan Yingying Zhang State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China

Organic proteins are attractive owing to their unique optical properties,remarkable mechanical characteristics,and *** multifunctional structures on organic protein films is essential for practical applications;however,the controllable fabrication of specific structures remains ***,we propose a strategy for creating specific structures on silk film surfaces by modulating the bulging and ablation of organic *** surface morphologies such as bulges and craters with continuously varying diameters were generated based on the controlled ultrafast laser-induced crystal-form transition and plasma ablation of the silk *** to the anisotropic optical properties of the bulge/crater structures with different periods,the fabricated organic films can be used for large-scale inkless color *** simultaneously engineering bulge/crater structures,we designed and demonstrated organic film-based optical functional devices that achieves holographic imaging and optical *** study provides a promising strategy for the fabrication of multifunctional micro/nanostructures that can broaden the potential applications of organic materials.

关键词： Ultrafast laser Protein Bulging Ablation Optical functional devices

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Microstructure and properties of LZQT600-3 HCCDIBs for plunger pump cylinder

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China Foundry 2024年第2期21卷 197-204页

作者： Chun-jie Xu Yuan-ying Jin Dong Ma Zhen zhao Jia-wei Qi Shang Sui Xiang-quan Wu Can Guo Zhong-ming Zhang Yong-hui Liu Dan Shechtman School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048China Xi'an Shechtman Nobel Prize New Materials Institute Xi'an 710048China Tongchuan Huazhu Precision Technology Co. Ltd.Tongchuan 727100ShaanxiChina Faculty of Materials Science and Engineering Technion-Israel Insititue of TechnologyHaifa 3200003Israel

It is important to improve the comprehensive performance of the ductile iron bars(DIBs)for the cylinder block of the extra high pressure hydraulic plunger pump and accelerate the industrial *** this work,the LZQT600-3 DIBs with the diameter of 145 mm were prepared by the horizontal continuous casting(HCC)process,that is,LZQT600-3 *** microstructure and room temperature tensile properties of different sections[left-edge(surface layer),left-1/2R(left half of the radius),and the center of the HCCDIBs]were *** results show that the spheroidization of LZQT600-3 HCCDIBs matrix from the left-edge,left-1/2R to the center is at nodulizing grade II and *** the cooling rate gradually decreases from surface to the center of the HCCIBs,the number of spheroidized graphite is gradually reduced,the size is gradually increased,the shape factor is decreased,and the pearlite content and lamellate spacing are *** the horizontal direction of the section,the hardness of the material is distributed symmetrically around the center of the *** the vertical direction,the hardness distribution in the center of the HCCDIBs is asymmetrical due to the gravity during the solidification ***,the microstructure in the lower part of the section solidifies relatively *** left-edge has the best tensile mechanical properties,and the ultimate tensile strength,yield tensile strength and elongation are 597.3 MPa,418.5 MPa and 9.6%,*** tensile fracture belongs to the ductile-brittle hybrid *** comprehensive performances of LZQT600-3 HCCDIBs meet the actual application requirements of ultra-high pressure hydraulic plunger pump cylinder.

关键词： horizontal continuous casting(HCC) nodular cast iron ductile iron bars microstructure mechanical properties

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0.2%莪术醇饵剂防治农田害鼠的田间药效试验

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中国媒介生物学及控制杂志 2024年第1期35卷 9-13页

作者：段倩云陈舜弘张巧玲赵日良赵方婷马桂明丽江市植保植检站云南丽江674100 丽江市古城区植保植检站云南丽江674100 吉林省延边天保生物制剂有限公司吉林延边133700

目的验证0.2%莪术醇饵剂对农田害鼠的田间药效,以及筛选其最佳使用剂量。方法在云南省丽江市鼠疫疫源地采用0.2%莪术醇饵剂1 500、3 000和4 500 g/hm23个剂量开展田间综合测试,于投药后第30、60和90天分别调查农田鼠密度变化、害鼠子... 详细信息

目的验证0.2%莪术醇饵剂对农田害鼠的田间药效,以及筛选其最佳使用剂量。方法在云南省丽江市鼠疫疫源地采用0.2%莪术醇饵剂1 500、3 000和4 500 g/hm23个剂量开展田间综合测试,于投药后第30、60和90天分别调查农田鼠密度变化、害鼠子宫发育、怀孕率及胎仔数等变化情况。Excel 2010软件计算药效和摄食情况相关指标。结果莪术醇饵剂1 500、3 000和4 500 g/hm2组投药后30 d控制效果分别为47.06%、51.87%和57.65%,投药后60 d控制效果分别为50.00%、63.64%和60.00%,投药后90 d控制效果分别为54.55%、62.81%和50.91%。亚成体数量明显下降,雌成鼠怀孕率及平均胎仔数下降;害鼠对莪术醇饵剂的摄食系数为0.77;自投药后第1天开始连续15 d的调查,未观察到死鼠及其他非靶标生物的死亡情况。结论从防控效果和经济阈值综合考虑,0.2%莪术醇饵剂防控农田害鼠的推荐应用剂量为3 000 g/hm2。

关键词：莪术醇饵剂田间药效农田害鼠抗生育

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Improvement in hydrogen storage performance of MgH_(2) by vanadium doped with ZIF-8 derived a single-atom catalyst V-N-C

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Rare Metals 2024年第6期43卷 2623-2635页

作者： Fei-Fan Hong Wei-Tao Shi Ruo-Lin zhao Yi Fan Zi-Qi Liu Si-Zhi Ding Hai-Zhen Liu Wen-Zheng Zhou Jin Guo Zhi-Qiang Lan Guangxi Novel Battery Materials Research Center of Engineering Technology and Center on Nanoenergy Research Guangxi Colleges and Universities Key Laboratory of Blue Energy and Systems IntegrationCarbon Peak and Neutrality Science and Technology Development InstituteSchool of Physical Science and TechnologyGuangxi UniversityNanning 530004China Nanning Engineering Technology Research Center for Power Transmission System of New Energy Vehicle Transportation CollegeNanning UniversityNanning 530200China

Herein,the successful preparation of a singleatom catalyst V-N-C using vanadium-doped zeolitic imidazolate framework(ZIF)-8 as a precursor is *** experimental results showed that the V-N-C had a good promoting effect on the hydrogen storage performance of MgH_(2),and the optimal addition amount of V-N-C was 10wt%.The hydrogenation and dehydrogenation apparent activation energies of 10 wt%V-N-C-catalyzed MgH_(2)were reduced by 44.9 and 53.5 kJ·mol^(-1),respectively,compared to those of additive-free MgH_(2).The 10 wt%V-N-C-catalyzed MgH_(2)could reabsorb 5.92 wt%of hydrogen in 50 min at 150℃,with a capacity retention rate of 99.1%after 30 cycles of hydrogen absorption and *** analysis showed that V-N-C was partially transformed into VN and metallic V when it was milled with MgH_(2);the in-situ-formed VN and metallic V played an important role in improving the hydrogen storage performance of MgH_(2).This approach provides a potential solution for obtaining high-performance Mg-based hydrogen storage materials through synergistic interactions between V,N and C.

关键词： MgH_(2) Hydrogen storage materials Catalyst Hydrogen storage perormance

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