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LiMn2O4 with hierarchical porous morphology obtain an excellent electrochemical performance

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LiMn2O4 with hierarchical porous morphology obtain an excell...

河南省化学会2016年学术年会

作者： Zihe Li Weihua Chen Liwei Mi Xiangming Feng College of chemistry and Molecular Engineering Zhengzhou University Center for Advanced Materials Research Zhongyuan University of Technology

As one of important positive materials for Li-ion batteries, LiMnO have been commercialized in recent years, and LiMnO-based batteries have been successful applied in Electric Vehicles and Hybrid Electric Vehicles. To improve the LiMnO electrochemical performance, some attention is paying to the control of morphologies, just like cubic and sphere. However, various morphologies haven’t been compared in the electrochemical field, and draw a conclusion about the cause of formulation. So, we could manipulate the key factor to template the morphology. Herein, we attempt to control p H value and surfactant for synthesizing the cubic, sphere, onion-like Mn2O3 precursor and probe their generation mechanism. Based on the prepared MnO, we fabricated the corresponding morphology spinel LiMnO by calcining LiOH and precursor MnO described above. The onion shaped LiMnO inherits an excellent morphology from a hierarchical onion sphere MnO tend to present an excellent electrochemical performance, it possesses the best rate capacity with 139 m Ah g at 0.05 C, it retention 88.6 % as the current rate rising from 0.05 C to 2C.

关键词： LiMn2O4 ph value surfactant morphology

Application of umbilical artery blood gas analysis in preterm birth

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Application of umbilical artery blood gas analysis in preter...

2019浙江省妇产科医师大会及妇产科学学术年会

作者： Jianxia Huang Zhifen Zhang Wensheng Hu Pei He Department of Obstetrics Hangzhou Women’s Hospital (Hangzhou Maternity and Child Health Care Hospital)

Objective:To compare the differences of umbilical artery blood gas between term and preterm *** to the find correlation between umbilical artery blood gas and organ damage in preterm ***:A prospective case-control study was *** January 2016 to December 2018,190 preterm and 216 normal term neonates were *** artery blood was collected immediately after birth for blood gas *** differences of ph value,lactic acid,oxygen saturation,partial pressure of oxygen,partial pressure of carbon dioxide,standard base residue and standard bicarbonate between preterm and full-term neonates were *** the same time,we divided the preterm neonates into organ damage group and non-organ damage *** differences of ph value,lactic acid,oxygen saturation,partial pressure of oxygen,partial pressure of carbon dioxide,residual standard base and standard bicarbonate were *** also calculated the correlation between perinatal risk factors,organ damage,and umbilical cord blood gas ***:There were no significant differences in maternal age,parity,body mass index between preterm and full-term pregnant ***,birth weight,Apgar score and gestational age were significantly different between two *** were significant differences in ph,lactic acid,residual standard base and standard bicarbonate between preterm and full-term *** preterm group,there were significant differences in ph,lactic acid,oxygen saturation,pco2,standard bicarbonate between organ damage group and non-organ damage *** Perinatal high-risk factors have significant effects on lactic *** fetal distress had a significant correlation with organ ***:The blood gas analysis indicators between premature and full-term neonates were *** an independent reference range for umbilical cord blood gas analysis should be established for preterm *** in the premature preterm neonates,there is a co

关键词： lactic acid organ damage preterm birth ph value umbilical artery blood gas

Analysis on the Change of Soil ph in Tobacco Fields During the Cultivation of Flue-cured Tobacco

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Agricultural Biotechnology 2020年第3期9卷 113-114,118页

作者： Yunfei CHEN Ailian OUYANG Jiye QIANG Colleege of Agruicultural and Forestry Pu'er UniversityPu'er 665000China Rural Development Research Center Pu'er UniversityPu'er 665000China

[Objectives] This study was conducted to understand soil p H changes during tobacco planting and its reasons. [Methods]Soil samples were collected from Jingdong,Jinggu and Zhenyuan tobacco-planting areas of Pu'er City before tobacco planting and during different growth stages of tobacco. [Results] Planting flue-cured tobacco changed the soil p H value. First,it was affected by the nicotine produced by the root system of tobacco plants. Second,it was affected by the type of soil. [Conclusions] This study has certain theoretical guiding significance for the cultivation management of flue-cured tobacco and the arrangement of ensuing crops.

关键词： Tobacco cultivation ph value Change

ph Effect on the enthalpic interaction coefficients of N-glycylglycine with protocatechuic acid in the phosphate Buffer Solutions

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pH Effect on the enthalpic interaction coefficients of N-gly...

第十七届全国化学热力学和热分析学术会议

作者： C.M.Wang Y.Zheng D.Z.Sun M.Liu School of Chemistry and Chemical Engineering Liaocheng University

Protocatechuic acid plays an important role in the process of killing diseased cells[1-2].The research on the application of protocatechuic acid has attracted a great deal of the *** mixing enthalpies of N-glycylglycine with protocatechuic acid in phosphate buffer solutions at different p H value have been measured by means of mixing-flow isothermal microcalorimetry at the temperature of 298.15 *** heterotactic enthalpic interaction coefficients（hxy,hxxy,and hxyy）in the p H range（3.0 to 8.0）of the buffer solutions have been calculated according to the Mc Millan–Mayer *** results showed that with the increase of the p H value,heterotactic enthalpic pairwise interaction coefficients hxy between N-glycylglycine and protocatechuic acid pass through a minimum at p H *** results are interpreted in terms of the solute-solute and solute-solvent interactions.

关键词： N-glycylglycine protocatechuic acid phosphate buffer solutions ph value mixing enthalpy enthalpic interaction coefficients

Effect of ph and concentration on the morphology and size distribution of CeO2 precursor

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Effect of pH and concentration on the morphology and size di...

2011中国材料研讨会

作者： Chen Jianqing 1,Chen Zhigang 2,Wei Yong 1 (1.College of Mechanics and Materials,Hohai University,Nanjing 210098,China 2.Suzhou University of Science and Technology,Suzhou 215011,China)

Different morphology Cerium oxide （CeO 2） precursors,such as sphere,slice,rod,were prepared by thermal decomposition of cerium oxycarbonate *** precursors were synthesized by homogenous precipitation using cerium nitrate and urea as raw materials at different ph and cerium nitrated *** ph value of the reactant solution was modified with dilute nitrate and *** effect of ph value and concentration of the reactant solution on the morphology and size distribution of the precursors was studied by scanning electron microscope （SEM）.The morphology of the precursors was affected by the concentration of cerium nitrate and ph value of the reactant *** size distribution of the precursors was mainly affected by the ph *** cerium concentration,low ph value contributed to the formation of monodispersed spherical cerium oxycarbonate precursors.

关键词： morphology size distribution ph value homogenous precipitation

Analysis of the Temporal-spatial Distribution and Seasonal Variation of the Acid Rain in Guangxi Province

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Meteorological and Environmental Research 2010年第1期1卷 62-65页

作者：程爱珍韦华红谭斐广西气象信息中心广西南宁530022 广西防城港气象局广西防城港538001

The temporal-spatial distribution and seasonal variation of the precipitation acidity in Guangxi Province were statistically analyzed by means of the data from 2003 to 2008 in 10 Stations of Acid Rain Observation in the province and the data from 1996 to 2008 in two Monitoring Spots in Nanning and Baise,*** results showed that annual average ph value of precipitation was ph value of precipitation was <***,it can be thought that the serious acid rain had appeared in the *** was an obvious seasonal variation in the extent of the acidity in precipitation and the acidity of precipitation in spring and winter was heavier than that in summer and autumn.

关键词： Acid rain ph value Distribution Variation Analysis China

Study on the Variation of Three Parameters during Industrial Cultivation of Liquid Spawn to Pleurotus eryngii

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Agricultural Biotechnology 2017年第6期6卷 57-59页

作者： Feng ZHOU Tao WANG Yu LI Xiaodong SHANG Chunyan SONG Qiaozhen LI Qi TAN Zhengpeng LI Institute of Edible Fungi Shanghai Academy of Agricultural Sciences/Key Laboratory of Edible Fungi Resources and Utilization( South) Ministry of Agriculture P. R. China/National Engineering Research Center of Edible Fungi/National R&D Center for Edible Fungi Processing/Key Laboratory of Edible Fungi Resources and Utilization (South) Ministry of Agriculture P.R. China/Key Laboratory of Agricultural Genetics and Breeding of Shanghai Shanghai 201403 China

In order to effectively guide industrial cultivation of liquid spawn to Pleurotus eryngii, the changes of the mycelial amount, CO2 concentration and ph value during the industrial cultivation of liquid spawn to Pleurotus eryngii were studied. The results showed that during the culture of mycelium, the changes of my- celium amount and CO2 concentration accorded with the S type growth curve, and the 4^th -8^th d was the logarithmic phase with the growth amount of mycelium 0.05 g/100 ml per day. After 9 d, the mycelium growth tended to slow down, and by tile end of the mycelium cultivation, mycelium began to slightly decrease. The ph value of medium changed slightly in 0.5 during the mycelium cultivation. The three groups of parameters showed that the liquid strain fermentation time should be 8 to9d.

关键词： Pleurotus eryngii Liquid spawn Mycelium amount COs concentration ph value

Distribution of CO2 in Soil Air Affected by Vegetation in the Shilin National Park

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Distribution of CO2 in Soil Air Affected by Vegetation in th...

作者： SONG Linhua LIANG Fuyuan Institute of Geographical Sciences and Natural Resources,Chinese Academy of Sciences

＜正＞ This paper studies the CO2 distribution of soil atmosphere in the Shilin National Park. The measurement sites were chosen according to different topographic features and different vegetations. Seven measurement sites on 3 cross sections were chosen to pass through 3 karstic depressions or on the slopes of depressions. All measurement results show soils with ph values lower than 7.0 （from 5.4 to 6.6）. There are 2 cases for the ph values of soil in different topographic features: the ph values of 2 profiles on the ridges or upper slopes of depressions are lower than those in the depressions;and the ph values of 2 soil profiles on the slopes of depressions are higher than those in the depressions. Most samples show relatively low humidity and CO2 contents on the ridges or slopes of depressions compared with soil profiles in the depressions. High CO2 contents occur at depths from -40 to -80 cm and high and dense grassland shows high CO2 contents in the soil atmosphere. Grass roots may grow and are distributed mainly at depths from -20 to -40 cm;while tree roots predominantly as deep as -60 cm even -80 cm. The influences of pine, cypress and eucalyptus on soil CO2 have been studied. Soil CO2 influenced by pine and cypress are generally concentrated in an area surrounding the tree with a diameter of 1 m and the strongly influenced distance is 50 cm. Eucalyptus will strongly affect the CO2 contents in an area with a diameter of 2 m, especially 1 m distant from the tree. The highest concentration of soil CO2 at a depth of -30 and 100 cm from the tree reaches 92000 ppm.

关键词： Shilin National Park karstic depression ph value concentration of soil CO2

Effects of Different Heavy Crude Oil Fractions on the Stability of Oil-in-Water Emulsion——Ⅲ. Effects of ph on the interfacial properties of heavy crude functional fractions and water system

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Petroleum Science 2005年第2期2卷 103-106,111页

作者： FanWeiyu NanGuozhi LiShuiping SongYuanming ChinaUniversityofPetroleum DongyingShandong257061China

In this paper, effects of ph on the interfacial properties of heavy crude functional fractions and water system are investigated. The influence of ph on π-A isotherms of acid fraction, basic fraction, amphoteric fraction and asphaltene is great. The interfacial pressure of fractions increases in strongly basic conditions. The ζ (-80mv) of acid fraction is the largest under basic conditions (ph=11-12), with the result to show that the interfacial activity of the acid fraction is superior to that of other fractions. The results of model emulsions show that strongly basic conolition (ph≥11) is beneficial to oil-in- water emulsion stability. The interfacial activity of acid fraction and asphaltene is superior to that of other crude fractions.

关键词： ph value stable factors of emulsion interfacial properties