|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effects of fumaric acid supplementation on methane production and rumen fermentation in goats fed diets varying in forage and concentrate particle size显示文摘Background: In rumen fermentation, fumaric acid(FA) could competitively utilize hydrogen with methanogenesis to enhance propionate production and suppress methane emission, but both effects were diet-dependent. This study aimed to explore the effects of FA supplementation on methanogenesis and rumen fermentation in goats fed diets varying in forage and concentrate particle size.Methods: Four rumen-cannulated goats were used in a 4 × 4 Latin square design with a 2 × 2 factorial arrangement of treatments: low or high ratio of forage particle size: concentrate particle size(Fps:Cps), without or with FA supplementation(24 g/d). Fps:Cps was higher in the diet with chopped alfalfa hay plus ground corn than in that with ground alfalfa hay plus crushed corn.Results: Both increasing dietary Fps:Cps and FA supplementation shifted ruminal volatile fatty acid(VFA) patterns toward more propionate and less acetate in goats. An interaction between dietary Fps:Cps and FA supplementation was observed for the ratio of acetate to propionate(A:P), which was more predominant when FA was supplemented in the low-Fps:Cps diet. Methane production was reduced by FA, and the reduction was larger in the low-Fps:Cps diet(31.72%) than in the high-Fps:Cps diet(17.91%). Fumaric acid decreased ruminal total VFA concentration and increased ruminal p H. No difference was found in ruminal DM degradation of concentrate or alfalfa hay by dietary Fps:Cps or FA. Goats presented a lower ruminal methanogen abundance with FA supplementation and a higher B. fibrisolvens abundance with high dietary Fps:Cps.Conclusions: Adjusting dietary Fps:Cps is an alternative dietary model for studying diet-dependent effects without changing dietary chemical composition. Fumaric acid supplementation in the low-Fps:Cps diet showed greater responses in methane mitigation and propionate increase. | Zongjun Li Nannan Liu Yangchun Cao Chunjia Jin Fei Li Chuanjiang Cai Junhu Yao | 2018 | Journal of Animal Science and Biotechnology2018，9，2： | 8 |
| 2 | Muhigrid for the mortar element method with locally P1 nonconforming element 显示文摘 | BI Chunjia LI Likang | 2003 | Numer Math: A Journal of Chinese Universities English Series2003，，2： | 1 |
| 3 | Effect of DC electric field on moisture migration characteristics in oil-pressboard显示文摘The moisture content has a great influence on the electric insulation strength of oil-pressboard.Therefore,it is very important to assess the moisture content in power transformers.There is lack of research about the effect of DC electric field on moisture migration.Here,the authors analyse the moisture migration characteristics of oil-press-board under DC electric field.The DC electric field has a greater influence on the moisture content in the oil.Compared with no DC electric field,the moisture content in oil is reduced by 22.91 mg/L at 50℃,while it is reduced by 17.63 mg/L at 70℃.Under the same moisture content in the oil,the moisture content in the pressboard which affected by the DC electric field is higher than the Oommen curve,the maximum dif-ference is 0.88%at 50℃,and 0.05%at 70℃.This result can provide a reference for the revision of existing moisture assessment methods. | Qing Yuan Bo Qi Jianshe Zhao Chunjia Gao Xiao Yang Shuqi Zhang Chengrong Li | 2021 | High Voltage2021，6，4： | 1 |
| 4 | The mortar finite volume element method with the Crouzeix-Raviart element for elliptic problems显示文摘 | Bi Chunjia Li Likang | 2003 | Comp Meth Appl Mech Engrg2003，192，： | 1 |
| 5 | Acquired Cardiomyopathy Caused by Cardiac Tsc1 Deficiency显示文摘Cardiomyopathies are myocardial disorders with enlarged,thick,or rigid cardiac muscles.Because no effective treatment is available to prevent the deterioration of the myocardium function,the prognosis of cardiomyopathy is usually poor.Cardiomyopathies can be inherited or acquired.A number of genes associated with inherited cardiomyopathy,such as the genes encoding for sarcomeric,cytoskeletal,nuclear membrane,lysosomal,desmosomal and mitochondrial proteins, | Yi Chena Fang Wang Chunjia Li Lianmei Wang Hongbing Zhang Hongbing Yan | 2014 | Journal of Genetics and Genomics2014，41，2： | 0 |
| 6 | Influence of moisture on the interface charge of oil-pressboard composite insulation under DC voltage显示文摘The distortion of the electric field in the oil–pressboard composite insulation caused by the accumulation of the interface charge is detrimental to both the insulation design and operation of converter transformers.The influence of moisture content on the surface charge accumulation of oil–pressboard insulation under DC voltage was studied in this study.In accordance with the Kerr electro-optic effect,the electric field strengths in transformer oil and the surface charge density were acquired after applying the positive and negative DC voltages in three oil–pressboard insulation models with different moisture content,respectively.The resistivities of the oil and pressboard in three models,namely Model 1#with 3.8–4.2 ppm moisture in oil and 0.35–0.37%moisture in pressboard,Model 2#with 7.6–7.9 ppm moisture in oil and 0.79–0.82%moisture in pressboard and Model 3#with 14.9–15.4 ppm moisture in oil and 1.39–1.42%moisture in pressboard,was also measured.The results indicate that:(i)as negative charges in oil accumulated on the pressboard surface in a much greater speed than the positive ones,the electric field in transformer oil under negative DC voltage decreases more rapidly with time than that under positive DC voltage;(ii)the increase of the moisture content in both oil and pressboard,under either positive or negative DC voltage,leads to the decrease of both the electric field strength in transformer oil and the charge density with time;and(iii)the increase of moisture content could not only decrease the resistivity of both oil and pressboard,but also the ratio of the resistivity between the pressboard and the oil.On the basis of the Maxwell–Wagner theory,the decrease of the ratio between the pressboard and oil could lead to the decrease of the interfacial charge density,leading to the slow transient process of the electric field in transformer oil under DC voltage. | Bo Qi Yanqiu Jiao Chunjia Gao Shuqi Zhang Xiaolin Zhao Chengrong Li | 2018 | High Voltage2018，3，1： | 0 |
| 7 | Trace Element and Sulfur Isotope Compositions of Gold-bearing Pyrite from the Zhangjiawa Iron Skarn Deposit,Laiwu District:Implications for Sources of Early Cretaceous Gold Mineralization in the North China Craton显示文摘Objective The Zhangjiawa iron deposit is the largest-tonnage and representative iron skarn deposit,with proven reserves of 290 Mt at an average of 46%Fe(up to>65%),in the Laiwu district,eastern North China Craton(NCC)(Figs.1 a,b;Duan and Li,2017).Iron mineralization at Zhangjiawa is mainly hosted along a northern contact zone between the Kuangshan dioritic intrusion and Middle Ordovician carbonate rocks that host numerous evaporite intercalations(Figs.1b,c). | DUAN Zhuang FU Yangang LI Chunjia ZHAO Shaorui GAO Mingbo GAO Jilei JIN Lijie LI Siyuan NGO Dac Xuan | 2021 | Acta Geologica Sinica(English Edition)2021，95，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员