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无纺布覆盖苗床对育苗温度及秧苗生长的影响

蔬菜 2018年第4期 13-17页

作者：安红艳刘旺张京开盛顺谢杰孙贵芹王荣雪苗秋生北京市农业机械试验鉴定推广站北京100079

为了了解无纺布在蔬菜育苗中的应用效果,以生菜为试验材料,进行了无纺布覆盖、塑料薄膜覆盖和无覆盖对照处理下苗床温度、温度均衡性和秧苗生长的研究。结果表明:夜间(16:30—7:30)无纺布覆盖处理苗床温度分别比塑料薄膜覆盖、无覆盖物... 详细信息

为了了解无纺布在蔬菜育苗中的应用效果,以生菜为试验材料,进行了无纺布覆盖、塑料薄膜覆盖和无覆盖对照处理下苗床温度、温度均衡性和秧苗生长的研究。结果表明:夜间(16:30—7:30)无纺布覆盖处理苗床温度分别比塑料薄膜覆盖、无覆盖物处理高1.12℃和0.30℃;白天(7:30—15:40)无纺布覆盖苗床温度比塑料薄膜覆盖低2.29℃,比无覆盖高1.77℃,无纺布覆盖升温速度比塑料薄膜覆盖小,但比不覆盖大。塑料薄膜覆盖苗床温度高于30℃的时长约为3 h,无纺布覆盖苗床温度高于30℃的时长约为1 h,说明无纺布覆盖能给生菜种子发芽提供适宜的温度;白天无纺布覆盖苗床最高温度较塑料薄膜低,与无覆盖温度相差不大,夜间平均温度比塑料薄膜覆盖和无覆盖高,使用无纺布覆盖能减少种子发芽阻碍时间。另外,使用无纺布覆盖育苗可保证苗床内温度均衡性,促进秧苗出苗率和整齐度,使得秧苗提前出芽。综合考虑材料成本及使用频率,发现在蔬菜育苗中无纺布是塑料农膜的理想替代材料。

关键词：无纺布冬季育苗生菜温度

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日光温室叶类蔬菜越夏椰糠栽培技术

蔬菜 2018年第5期 49-51页

作者：安红艳刘旺张京开盛顺谢杰孙贵芹王荣雪苗秋生北京市农业机械试验鉴定推广站北京100079

针对夏季高温、强光的环境使喜冷凉气候的叶菜在日光温室内生产面临的种种障碍,加上长期连作,使得种植过程中出现的诸多问题,如菠菜死棵、生菜抽薹、莴苣萎蔫等,结合叶菜种植特点,总结出了一套日光温室叶类蔬菜越夏椰糠种植技术,克服了... 详细信息

针对夏季高温、强光的环境使喜冷凉气候的叶菜在日光温室内生产面临的种种障碍,加上长期连作,使得种植过程中出现的诸多问题,如菠菜死棵、生菜抽薹、莴苣萎蔫等,结合叶菜种植特点,总结出了一套日光温室叶类蔬菜越夏椰糠种植技术,克服了叶菜连作障碍,减少了农药和化肥的使用量,提高了产量和品质,达到了增产增收效果;通过品种选择、壮苗培育、整地及铺设椰糠、定植及田间管理、病虫害防治等诸多措施,确保了叶菜的周年生产,满足了人们夏季对新鲜叶菜的需要。

关键词：日光温室叶类蔬菜越夏栽培椰糠种植

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不同叶菜越夏种植模式对比试验

农业工程 2018年第9期8卷 112-114页

作者：安红艳盛顺刘旺张京开谢杰孙贵芹王荣雪苗秋生北京市农业机械试验鉴定推广站北京100079

针对夏季高温对日光温室叶菜生长的影响,分别对土壤+遮阳网、基质+遮阳网、基质+遮阳网+湿帘3种越夏种植模式进行对比试验,分析其对温室温湿度、叶菜生长及经济效益的影响。研究结果初步表明:一年中最热的一天,室外白天(早8:00~15:30)... 详细信息

针对夏季高温对日光温室叶菜生长的影响,分别对土壤+遮阳网、基质+遮阳网、基质+遮阳网+湿帘3种越夏种植模式进行对比试验,分析其对温室温湿度、叶菜生长及经济效益的影响。研究结果初步表明:一年中最热的一天,室外白天(早8:00~15:30)平均温度为32. 5℃时,土壤+遮阳网、基质+遮阳网种植模式室内白天平均温度分别比基质+遮阳网+湿帘种植模式温度高7. 1℃、6. 4℃。同时,室内白天平均相对湿度,基质+遮阳网比土壤+遮阳网种植模式低,基质+遮阳网+湿帘种植模式平均相对湿度最高。结合产量及效益可知,京研快菜、京水菜在基质+遮阳网+湿帘模式下产量最高,春油1号在基质+遮阳网模式下种植产量最高,3种叶菜在基质+遮阳网+湿帘种植方式下种植效益最好。

关键词：越夏生产种植模式叶菜种植

Accelerated Evolution of H7N9 Subtype Influenza Virus under Vaccination Pressure

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Virologica Sinica 2021年第5期36卷 1124-1132页

作者： Yifan Wu jingkai Hu Xuanjiang Jin Xiao Li Jinfeng Wang Mengmeng zhang Jianglin Chen Shumin Xie Wenbao Qi Ming Liao Weixin Jia National Avian Influenza Para-Reference Laboratory(Guangzhou) College of Veterinary MedicineSouth China Agricultural UniversityGuangzhou 510642China Key Laboratory of Zoonosis Key Laboratory of Animal Vaccine DevelopmentMinistry of Agriculture and Rural AffairsGuangzhou 510642China Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510642China National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control Guangzhou 510642China Key Laboratory of Zoonoses Prevention and Control of Guangdong Province Guangzhou 510642China

No avian H7 N9 outbreaks have occurred since the introduction of H7 N9 inactivated vaccine in the fall of ***,H7 N9 is still prevalent in *** surveil the prevalence,genetic characteristics,and antigenic changes of H7 N9,over7000 oropharyngeal and cloaca swab specimens were collected from live poultry markets and farms in 15 provinces of China from 2017 to 2019.A total of 85 influenza virus subtype H7 N9 strains were isolated and 20 representative strains were selected for genetic analysis and antigenicity *** indicated the decreased prevalence of low-pathogenic H7 N9 strains while highly-pathogenic H7 N9 strains became dominated since the introduction of *** analysis showed that strains from 2019 formed an independent small branch and were genetically distant to strains isolated in 2013–*** of key amino acid sites showed that the virus strains may adapt to the host environment evolutionally through *** analysis predicted additional potential glycosylation sites for HA and NA genes in the 2019 *** analysis of HA gene in strains isolated from 2018 to 2019 showed that there were an increased nucleotide substitution rate and an increased mutation rate in the first and second nucleotides of coding codons within the open reading *** hemagglutination inhibition(HI)assay showed that H7-Re1 and H7-Re2 exhibited a lower HI titer for isolates from 2019,while H7-Re3 and r LN79 showed a high HI *** protective effect of the vaccine decreased after15 months of ***,under vaccination pressure,the evolution of influenza virus subtype H7 N9 has accelerated.

关键词： H7N9 Genetic evolution Epidemiological investigation Hemagglutination inhibition assay Vaccination pressure

Microstructures,mechanical properties and degradability of Mg-2Gd-0.5(Cu/Ni)alloys:A comparison study

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Journal of Materials Science & Technology 2022年第33期128卷 44-58页

作者： Shiyu Zhong Dingfei zhang Yongqin Wang Sensen Chai jingkai Feng Yulun Luo Jianrong Hua Qimin Dai Guangshan Hu Junyao Xu Bin Jiang Fusheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400045China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China College of Information Science and Engineering Jiaxing UniversityJiaxing 314001China Chongqing Academy of Science and Technology Chongqing 401123China

Low alloying Mg-2 Gd-0.5(Cu/Ni)alloys for sealing tools in the oil and gas industry were *** differences in the effects of minor Cu and Ni additions on microstructures and properties of the Mg-2 Gd alloy were *** results showed that adding Ni was more effective than adding Cu in refining grain sizes,strengthening the basal fiber texture,and promoting the formation of LPSO phases,resulting in higher *** tensile yield strength/elongation of the Mg-2 Gd-0.5 Cu alloy,Mg-2 Gd-0.25 Cu-0.25 Ni alloy,and Mg-2 Gd-0.5 Ni alloy was 146 MPa/23.7%,175 MPa/23.1%,and 248 MPa/18.2%,*** decreased elongation was attributed to the basal fiber texture and the presence of coarse LPSO *** terms of the corrosion rate in 3.5 wt.%NaCl solution,it rose from 112 mm y^(-1)for the Mg-2 Gd-0.5 Cu alloy to 269 mm y^(-1)for the Mg-2 Gd-0.25 Cu-0.25 Ni alloy and 490 mm y^(-1)for the Mg-2 Gd-0.5 Ni alloy,indicating that the addition of Ni instead of Cu showed a more significant promoting effect on the degradability of Mg alloys,which was related to more refined grains,the stronger basal fiber texture,and a larger amount of LPSO phases.

关键词： Magnesium alloy Alloying LPSO phases Mechanical properties Corrosion

Clinical Efficacy of Chaihu Shugan Powder Classical Formula in Treating Chronic Superficial Gastritis with Liver-Stomach Disharmony

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Medicinal Plant 2024年第6期15卷 70-72页

作者： Dongsheng zhang jingkai WANG Helan County Traditional Chinese Medicine Hospital Yinchuan 750200China General Hospital of Ningxia Medical University Yinchuan 750004China

[Objectives] To investigate the clinical efficacy of Chaihu Shugan Powder on chronic superficial gastritis with liver-stomach disharmony syndrome.[Methods] A total of 72 patients diagnosed with chronic superficial gastritis characterized by liver-stomach disharmony syndrome between September 2023 and August 2024 were randomly assigned into two groups. The control group received treatment with western medicine, and the treatment group was administered both western medicine and Chaihu Shugan Powder. The therapeutic effects, TCM syndrome scores, adverse reactions, and recurrence rate were compared between the two groups.[Results] The total effective rate was 88.89% in the treatment group and 80.56% in the control group. The differences between the two groups were statistically significant ( P <0.05), indicating that the improvement observed in the treatment group was significantly greater than that in the control group ( P <0.05). In comparison to pre-treatment levels, the TCM syndrome scores for both patient groups exhibited a reduction following treatment. Notably, the extent of this reduction in the treatment group was significantly greater than that observed in the control group ( P <0.05). Neither group of patients experienced serious adverse reactions during treatment. Furthermore, the recurrence rate among patients in the control group was found to be higher than that in the treatment group.[Conclusions] The clinical efficacy of Chaihu Shugan Powder in the treatment of chronic superficial gastritis with liver-stomach disharmony syndrome is significant, demonstrating a notable reduction in the recurrence rate of the condition.

关键词： Chaihu Shugan Powder Stomachache Chronic superficial gastritis Liver-stomach disharmony syndrome

Synchrotron radiation-based Fourier-transform infrared spectromicroscopy for characterization of the protein/peptide distribution in single microspheres

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Acta Pharmaceutica Sinica B 2015年第3期5卷 270-276页

作者： Manli Wang Xiaolong Lu Xianzhen Yin Yajun Tong Weiwei Peng Li Wu Haiyan Li Yan Yang jingkai Gu Tiqiao Xiao Min Chen Jiwen zhang School of Pharmaceutical Sciences Anhui University of Chinese Medicine Center for Pharmaceutical Preparations Shanghai Institute of Materia MedicaChinese Academy of Sciences School of Mechanical Engineering Shanghai Institute of Technology Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of Sciences College of Life Sciences Jilin University

The present study establishes a visualization method for the measurement of the distribution and localization of protein/peptide constituents within a single poly-lactide-co-glycolide (PLGA) microsphere using synchrotron radiation based Fourier-transform infrared speciiomlcroscopy (SR-FTIR). The representative infrared wavenumbers specific for protein/peptide (Exenatide) and excipient (PLGA) were identified and chemical maps at the single microsphere level were generated by measuring and plotting the intensity of these specific bands. For quantitative analysis of the distribution within microspheres, Matlab soft are was used to transform the map file into a 3D matrix and the matiix values specific for the drug and excipient were extracted. Comparison of the normalized SR- FM maps of PLGA and Exenatide indicated that PLGA was unit-on-lily distributed, while Exenatide was relatively non-uniformly distributed in the microspheres. In conclusion, SR-FTIR is a rapid, nondestructive and sensitive detection technology to provide the distribution of chemical constituents and functional groups in microparticles and microspheres. (C) 2015 Chinese Pharmaceutical Association and Institute of Materia 'Medico, Chinese Academy of 'Medical Sciences. Production and hosting by Elsevier B.V.

关键词： Fourier-transform infrared spectromicroscopy Micerosphere Exenatide PLGA

Experimental Studies on Thermo-mechanical Coupled Behavior of Pile-Clay Interface

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Experimental Studies on Thermo-mechanical Coupled Behavior o...

Elemental composition x-ray fluorescence analysis with a TES-based high-resolution x-ray spectrometer

作者： jingkai Wang Zhichao zhang School of Civil Engineering Chongqing University Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityMinistry of Education

The thermo-mechanical coupled behavior of pile-soil interface is very important for the mechanical performance of energy *** is studied in this paper by the thermo-mechanical coupled direct shear tests with a temperature controllable concrete specimen in the top shear box and a Kaolin clay specimen in the bottom shear *** results show that the strength of pile-clay interface significantly depends on the temperature,the temperature cycle number and the over-consolidation ratios of *** the heating-cooling cycles,the interface strength can increase and decrease monotonically or non-monotonically depending on the stress state and history of clay,which is generally a thermo-elasto-plastic *** is shown that the thermo-mechanical coupled pile-clay interface behavior is the net effect of the pore water transportation and the rearrangement of clay particles near the interface as well as the thermal consolidation/expansion of clay.

关键词： energy pile temperature cycle pile-clay interface direct shear test

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Chinese Physics B 2023年第9期32卷 67-73页

作者：吴秉骏夏经铠张硕傅强章辉谢晓明刘志 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Center for Excellence in Superconducting Electronics Chinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China

The accurate analysis of the elemental composition plays a crucial role in the research of functional *** emitting characteristic x-ray fluorescence(XRF)photons can be used for precisely discriminating the specified *** detection accuracy of conventional XRF methodology using semiconductor detector is limited by the energy resolution,thus posing a challenge in accurately scaling the actual energy of each XRF *** adopt a novel high-resolution x-ray spectrometer based on the superconducting transition-edge sensor(TES)for the XRF spectroscopy measurement of different *** including high energy resolution,high detection efficiency and precise linearity of the new spectrometer will bring significant benefits in analyzing elemental composition via *** this paper,we study the Ledge emission line profiles of three adjacent rare earth elements with the evenly mixed sample of their oxide components:terbium,dysprosium and *** orders of magnitude better energy resolution are obtained compared to a commercial silicon drift *** this TES-based spectrometer,the spectral lines overlapped or interfered by background can be clearly distinguished,thus making the chemical component analysis more accurate and quantitative.A database of coefficient values for the line strength of the spectrum can then be constructed *** with the novel XRF spectrometer and an established coefficient database,a direct analysis of the composition proportion of a certain element in an unknown sample can be achieved with high accuracy.

关键词： x-ray emission spectra and fluorescence superconducting transition-edge sensor rare earth elements chemical composition analysis