Introduction to higher education in China

Zhu, Hong; Lou, Shiyan

doi:10.1016/b978-1-84334-639-5.50001-2

Cited by 8 publications

(12 citation statements)

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“…The effect of soil pH on SOC is relatively complicated, because the soil texture, soil microbial biomass and community structure as well as the production and secretion of enzymes are all influenced by pH [47][48][49]. In general, the optimum pH condition of most actinomycetes and bacteria are 6.5-8, and fungi is 5-6 [50], so within the alkaline soil environment (pH > 8), microbe would become less active as pH rises, which may slow down the humification of litters and then result in the decrease of SOC content. Additionally, in an environment where pH is too high (or too low), the enzymes that play an important role in the transformation of nutrients and the formation of humus would be inactivated [51], which also leads to the loss of soil fertility and SOC content in the study area.…”

Section: Discussionmentioning

confidence: 99%

The Influence of Soil Physico-Chemical Properties and Enzyme Activities on Soil Quality of Saline-Alkali Agroecosystems in Western Jilin Province, China

Zhao

Tang

et al. 2018

Sustainability

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Soil organic carbon (SOC) plays a critical role in carbon cycling and soil quality of agroecosystems. Understanding the factors influencing SOC and the main indicators for soil quality can help in better soil management and sustainable agriculture. In this study, we selected three upland fields (U1, U2 and U3) and three paddy fields (P1, P2 and P3) of saline-alkali agroecosystems to study the impacts of soil physico-chemical properties (soil pH, exchangeable sodium percentage, electrical conductivity and bulk density) and enzyme activities (soil amylase, invertase, catalase and polyphenol oxidase) on SOC dynamics. The soil pH and exchangeable sodium percentage (ESP) had profoundly negative effect on SOC. Soil amylase and invertase activities were significantly positively correlated with SOC in both upland and paddy fields. Catalase promoted the accumulation of paddy SOC and polyphenol oxidase led to the acceleration of decomposition of upland SOC. Additionally, we combined SOC contents, soil physico-chemical properties and soil enzyme activities together to obtain the main indicators of soil quality. The results suggested that, in upland sites, the main factors affecting the soil quality were soil pH, ESP and SOC. As for paddy sites, the main indicators of soil quality were soil pH, amylase and invertase. By comparing the soil quality indicators between upland and paddy fields, it was observed that the inhibiting effect of ESP on paddy soil quality was not as significant as on upland soil quality due to the irrigation practice of rice planting, which could reduce the degree of soil alkalization. Therefore, paddy development has been widely used to improve the saline-alkali land in western Jilin Province of China.

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Section: Discussionmentioning

confidence: 99%

The Influence of Soil Physico-Chemical Properties and Enzyme Activities on Soil Quality of Saline-Alkali Agroecosystems in Western Jilin Province, China

Zhao

Tang

et al. 2018

Sustainability

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“…This was in accordance with the results reported by Zhu et al, where pK a1 of Pro was found to be 1.99. 23 Similarly, pK a3 of Pro-Hyp at 25 C was higher than 12 and could not be determined potentiometrically. The pK a1 values of Pro-Hyp and Gly-Pro-Hyp were lower than the pK a1 value of Gly; this indicated that the deprotonation of -COOH was triggered by the presence of imino group and other neighboring groups.…”

Section: Glymentioning

confidence: 91%

Complex formation constant of ferric ion with Gly, Pro-Hyp and Gly-Pro-Hyp

Zhi

Santoso

et al. 2018

RSC Adv.

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“…It is well-known that the magnetic field resulted from Helmholtz coils depends many factors, whose magnitude is directly proportion to not only electric current, but also the length of wire in coils [9]. In addition, the magnetic field is correlated to the structure and size of Helmholtz coils.…”

Section: The Design Of Helmholtz Coilsmentioning

confidence: 99%

“…According to Refs. [9][10], The magnetic field magnitude (B) at the center between the two coils can be expressed as for Helmholtz with N Turns:…”

Section: The Design Of Helmholtz Coilsmentioning

confidence: 99%

Mechanical Structure Design of Stress-generating System of Low-frequency Mechanical Spectrum Apparatus

Zhou¹,

Du²,

Yang³

et al. 2016

Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016)

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The shear stress-generating system is designed and calculated in low-frequency mechanical spectrum apparatus to obtain the 10-3 relative strain for the pure Al specimen with dimensions Ø1mm×50mm in this paper. The physical dimension of Helmholtz coil, the specification of enamel wire and the number of turns as well as the current flow of coil and the specification of power-amplifier source are designed according to the strain value. The acting force between the magnetic field caused by Helmholtz coil and the magnet steel is analyzed. It has been calculated that the diameter of copper enamel wire is 1.12mm, the number of turns is 1734, the inner and the external diameter of coil are 40 mm and 120mm respectively and the length is 60mm. If the load voltage of power-amplifier source is 30V and the currency is 4.48A, the uniform magnetic field of 0.07T is produced in the center region of Helmholtz coil and the force applied to the magnet steel will be beyond 26 N.

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Introduction to higher education in China

Cited by 8 publications

References 0 publications

The Influence of Soil Physico-Chemical Properties and Enzyme Activities on Soil Quality of Saline-Alkali Agroecosystems in Western Jilin Province, China

The Influence of Soil Physico-Chemical Properties and Enzyme Activities on Soil Quality of Saline-Alkali Agroecosystems in Western Jilin Province, China

Complex formation constant of ferric ion with Gly, Pro-Hyp and Gly-Pro-Hyp

Mechanical Structure Design of Stress-generating System of Low-frequency Mechanical Spectrum Apparatus

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