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Application of Hilbert-Huang transform based delay time identification in optimization of short millisecond blasting 被引量:5
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作者 史秀志 邱贤阳 +3 位作者 周健 陈新 范玉乾 卢二伟 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第7期1965-1974,共10页
The accurate identification of delay time in millisecond blasting plays an important role in the optimization of blasting design and reduction of vibration effect. Through a case study of a surge shaft blasting projec... The accurate identification of delay time in millisecond blasting plays an important role in the optimization of blasting design and reduction of vibration effect. Through a case study of a surge shaft blasting project, the capability of the EMD (empirical mode decomposition) method in identifying the delay time of short millisecond blasting with precise initiation was compared with the instantaneous energy method based on Hilbert-Huang transform (HHT). The recognition rate of the EMD method was more than 80%, while the instantaneous energy method was less than 25%. By analyzing the instantaneous energy of single-hole blasting signal, it was found that the instantaneous energy method was adaptable to millisecond blasting with delay time longer than half of the energy peak period. The EMD method was used to identify delay time of millisecond blasting in Zijinshan open-pit mine. According to the identification results, the blasting parameters were optimized for controlling the blast-induced vibration and reducing the large block ratio. The field data showed that the velocity peak of ground vibration was reduced by more than 30%under almost the same maximum charge per delay by the optimization of delay time and detonating detonators. Combining with slag-remaining blasting and burden optimization of the first row, the large block ratio was reduced to less than 3%. The research results proved that the identification method based on HHT was feasible to optimize the blasting design. The identification method is also of certain reference value for design optimization of other similar blasting projects. 展开更多
关键词 delay time identification short millisecond blasting precise initiation vibration reduction
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Enhancement of Photophosphorylation and Photosynthesis in Rice by Low Concentrations of NaHSO_3 Under Field Conditions 被引量:25
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作者 王宏炜 魏家绵 +2 位作者 沈允钢 张荣铣 杨图南 《Acta Botanica Sinica》 CSCD 2000年第12期1295-1299,共5页
Spraying 1-2 mmol/L solution of NaHSO 3 on rice ( Oryza sativa L.) leaves resulted in the enhancement of net photosynthetic rate for more than three days. It was also observed that NaHSO 3 application caused incr... Spraying 1-2 mmol/L solution of NaHSO 3 on rice ( Oryza sativa L.) leaves resulted in the enhancement of net photosynthetic rate for more than three days. It was also observed that NaHSO 3 application caused increases both in ATP content in leaves and the millisecond_delayed light emission of leaves. The increase in net photosynthetic rate caused by NaHSO 3 treatment was similar to that by PMS (phenazine methosulfate) treatment. The grain yield of treated rice was enhanced approximately by 10% after duplicated application of NaHSO 3 in milk_ripening stage. It is suggested that the enhancement of photosynthesis by NaHSO 3 treatment resulted from the effect of increasing ATP supplement. Concomitant with an increase in the photosynthetic rate and ATP content in leaves, the transient increase in chlorophyll fluorescence after the termination of actinic light, which could be used as an index of the cyclic electron flow, was also enhanced by low concentration of NaHSO 3 treatment. Basing on these results it is proposed that the increase in rice photosynthesis caused by low concentrations of NaHSO 3 could be due to the stimulation of the cyclic electron flow around PSⅠ which in turn the enhancement of the coupled photophosphorylation and photosynthesis. 展开更多
关键词 cyclic electron transport millisecond delayed light emission PHOTOPHOSPHORYLATION post_illumination transient increase in chlorophyll fluorescen
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Enhancement in wheat leaf photophosphorylation and photosynthesis by spraying low concentration of NaHSO_3 被引量:15
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作者 WANG Hongwei, WEI Jiamian & SHEN Yungang (SHEN Yun Kang)Shanghai Institute of Plant Physiology, Chinese Academy of Sciences, Shanghai 200032, China 《Chinese Science Bulletin》 SCIE EI CAS 2000年第14期1308-1312,共5页
Spraying 1-2 mmol/L NaHSO3 on the leaf of wheat results in enhancement of photosynthesis in leaves for about 3 d. The amount of ATP has been increased and the millisecond delayed light emission of the leaves has been ... Spraying 1-2 mmol/L NaHSO3 on the leaf of wheat results in enhancement of photosynthesis in leaves for about 3 d. The amount of ATP has been increased and the millisecond delayed light emission of the leaves has been enhanced, showing that the transmembrane proton motive force related to photophosphorylation is increased. Spraying PMS (a cofactor catalyzing cycle photophosphorylation) and NaHSO3 separately or together on the leaves, 20% increase in photosynthesis has been observed in all the treatments. There is no additive effect when a mixture is applied, suggesting that the mechanism for NaHSO3 promotion of photosynthesis is similar to PMS, and both of them enhance the supply of ATP. 展开更多
关键词 NaHSO3 PHOTOPHOSPHORYLATION ATP millisecond delayED light emission photosynthesis.
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Relationship between components of proton motive force and photosynthesis 被引量:2
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作者 李德耀 沈允钢 《Chinese Science Bulletin》 SCIE EI CAS 1995年第1期66-70,共5页
The proton motive force formed across the thylakoid membrane accompanying the photosynthetic electron transport can be used to synthesize ATP from ADP and inorganic phosphate for carbon assimilation. The mechanism of ... The proton motive force formed across the thylakoid membrane accompanying the photosynthetic electron transport can be used to synthesize ATP from ADP and inorganic phosphate for carbon assimilation. The mechanism of this important process has been intensively studied. However, there are still many aspects unsolved. For example: What is the ratio between the ATP and NADPH formed in noncyclic photophosphorylation and can it meet the requirement of carbon assimilation? Is there any localized proton within thylakoid membrane and is it related to the effi- 展开更多
关键词 PROTON MOTIVE FORCE PROTON LOCALIZATION millisecond delayED light emission.
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THE CONNECTION BETWEEN PROTONS RELEASED BY WATER OXIDATION AND CF_0 OF H^+-ATPase COMPLEX
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作者 吴少龙 马正平 李有则 《Chinese Science Bulletin》 SCIE EI CAS 1991年第20期1734-1737,共4页
There are two proton release sites on the photosynthetic electron transport chain. One is the protons released by water oxidation of the photosystem Ⅱ (PS Ⅱ) oxygen evolution complex located on the inner side of t... There are two proton release sites on the photosynthetic electron transport chain. One is the protons released by water oxidation of the photosystem Ⅱ (PS Ⅱ) oxygen evolution complex located on the inner side of the thylakoid membrane (i. e. H<sub>H<sub>2</sub>O</sub><sup>+</sup>), the other is the protons transferred across the thylakoid membrane and released on the inner side of 展开更多
关键词 PROTON conduction millisecond delayED light emission membrane-localized protons.
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