|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | The community structure and microbial linkage of rumen protozoa and methanogens in response to the addition of tea seed saponins in the diet of beef cattle显示文摘Background: This study investigated changes in rumen protozoal and methanogenic communities, along with the correlations among microbial taxa and methane(CH_4) production of six Belmont Red Composite beef steers fed tea seed saponins(TSS). Animals were fed in three consecutive feeding periods, a high-grain basal diet for 14 d(BD period) then a period of progressive addition of TSS to the basal diet up to 30 g/d for 20 d(TSS period), followed by the basal diet for 13 d without TSS(BDP post-control period).Results: The study found that TSS supplementation decreased the amount of the protozoal genus Entodinium and increased Polyplastron and Eudiplodinium genera. During BDP period, the protozoa community of steers did not return to the protozoal profiles observed in BD period, with higher proportions of Metadinium and Eudiplodinium and lower Isotricha. The addition of TSS was found to change the structure of methanogen community at the subgenus level by decreasing the abundance of methanogens in the SGMT clade and increasing the abundance of methanogens in the RO clade. The correlation analysis indicated that the abundance of SGMT clade methanogens were positively correlated with Isotricha, and Isotricha genus and SGMT clade methanogens were positively correlated with CH_4 production. While RO clade were positively correlated with the proportion of Metadinium genus, which was negatively correlated with CH_4 emission.Conclusions: These results suggest that different genera of rumen protozoa ciliates appear to be selectively inhibited by TSS, and the change in methanogen community at the subgenus level may be due to the mutualistic relationships between methanogens and rumen ciliates. | Cui Tan Carlos A.Ramírez-Restrepo Ali Mujtaba Shah Rui Hu Matt Bell Zhisheng Wang Chris McSweeney | 2021 | Journal of Animal Science and Biotechnology2021，12，1： | 3 |
| 2 | 水力压裂生产井的井下综合监测显示文摘阿曼南部Athel油层的第一阶段开发依靠了大规模水力压裂增产措施 ,以达到工业经济产量。在预测井的生产动态、优化井的布局及优化压裂设计中 ,裂缝尺寸、形状和方向是关键参数。由于是多层状构造 ,就流动边界和油藏动态特性而言 ,进行早期评价对于长期开发管理至关重要。为了获得这些数据 ,一套永久性的井下综合数据采集系统正安装在第一开发阶段的生产井中。此系统采用油管传送的仪表和三分量检波器独特组合 ,来实时传递在强化增产措施及开采过程中的井下压力、温度及微地震数据。 | Matt Bell 王艳丽 陈福明 金友春 | 2002 | 国外油田工程2002，18，6： | 1 |
| 3 | Potential of an activity index combining acceleration and location for automated estrus detection in dairy cows显示文摘The objective of this study was to assess the effectiveness and practicability of an activityindex combining acceleration and location data for automated estrus detection in dairycows. By using a wearable neck tag, measurements of acceleration and location were gathered from 22 multiparous cows monitored incessantly for 6 days to derive activity recordsof each cow. The maximum-minimum distance clustering (MMDC) method was used todivide hourly activity data into low, medium, high, and intensity level groups. The weightedsum of the proportions of the low, medium, high, and intensity activities in an hour constituted the activity level. The activity index was defined as the ratio of the variation inhourly activity level compared to the same time period during the previous three days. Furthermore, whether the cow was in estrus was judged above a set threshold. The studyshowed that the power consumption and communication effects of the neck tags wereacceptable for indoor-housing conditions. For the two consecutive time periods, theactivity-index-based detection algorithm achieved 90.91% for accuracy, 100% for precision,100% for specificity, 83.33% for recall, 90.91% for F1 score, and 0.82 for Kappa coefficient. Onthe basis of these results, it can be concluded that the combination of acceleration andlocation in the activity index can promote estrus detection in dairy cows. | Jun Wang Yadan Zhang Matt Bell Gang Liu | 2022 | Information Processing in Agriculture2022，9，2： | 1 |
| 4 | Electrospinning as a route to advanced carbon fibre materials for selected low-temperature electrochemical devices:A review显示文摘Electrospinning has been proven as a highly versatile fabrication method for producing nano-structured fibres with controllable morphology,of both the fibres themselves and the void structure of the mats.Additionally,it is possible to use heteroatom doped polymers or to include catalytic precursors in the electrospinning solution to control the surface properties of the fibres.These factors make it an ideal method for the production of electrodes and flow media for a variety of electrochemical devices,enabling reduction in mass transport and activation overpotentials and therefore increasing efficiency.Moreover,the use of biomass as a polymer source has recently gained attention for the ability to embed sustainable principles in the materials of electrochemical devices,complementing their ability to allow an increase in the use of renewable electricity via their application.In this review,the historical and recent developments of electrospun materials for application in redox flow batteries,fuel cells,metal air batteries and supercapacitors are thoroughly reviewed,including an overview of the electrospinning process and a guide to best practice.Finally,we provide an outlook for the emerging use of this process in the field of electrochemical energy devices with the hope that the combination of tailored microstructure,surface functionality and computer modelling will herald a new era of bespoke functional materials that can significantly improve the performance of the devices in which they are used. | Yue Wen Matt D.R.Kok Jorge Pavel Victoria Tafoya Ana BJorge Sobrido Ellsworth Bell Jeff T.Gostick Servann Herou Philipp Schlee Maria-Magdalena Titirici Dan J.L.Brett Paul R.Shearing Rhodri Jervis | 2021 | Journal of Energy Chemistry2021，30，8： | 0 |
| 5 | 探秘奇特之“镜”——湖泊显示文摘湖泊虽然因其相对封闭,没有河流的运动之美,却多了一份宁静安逸的情调。然而令人惊奇的是,世界各地的湖泊并非都是清澈见底、绿波荡漾,它们有各自的奇特之处,让人流连忘返。本文就带大家来探秘一番。想象一下,步行穿过远方一座森林覆盖的小岛,无意中发现一个波光粼粼的粉色湖泊。 | Matt Bell 张晓敏 | 2016 | 新东方英语(中学版)2016，0，7： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员