|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Characterization and functional analysis of chitinase family genes involved in nymph-adult transition of Sogatella furcifera显示文摘Chitinase degrades chitin in the old epidermis or peritrophic matrix of insects,which ensures normal development and metamorphosis.In our previous work,we comprehensively studied the function of SfCht7 in Sogatella furcifera.However,the number and function of chitinase genes in S.furcifera remain unknown.Here,we identified 12 full-length chitinase transcripts from S.furcifera,which included nine chitinase(Cht),two imaginal disc growth factor(IDGF),and one endo-β-N-acetylglucosaminidase(ENGase)genes.Expression analysis results revealed that the expression levels of eight genes(SfCht3,SfCht5,SfCht6-1,SfCht6-2,SfCht7,SfCht8,SfCht10,and SfIDGF2)with similar transcript levels peaked prior to molting of each nymph and were highly expressed in the integument.Based on RNA interference(RNAi),description of the functions of each chitinase gene indicated that the silencing of SfCht5,SfCht10,and SfIDGF2 led to molting defects and lethality.RNAi inhibited the expressions of SfCht5,SfCht7,SfCht10,and SfIDGF2,which led to downregulated expressions of chitin synthase 1(SfCHS1,SfCHS1a,and SfCHS1b)and four chitin deacetylase genes(SfCDA1,SfCDA2,SfCDA3,and SfCDA4),and caused a change in the expression level of two trehalase genes(TRE1 and TRE2).Furthermore,silencing of SfCht7 induced a significant decrease in the expression levels of three wing development-related genes(SfWG,SfDpp,and SfHh).In conclusion,SfCht5,SfCht7,SfCht10,and SfIDGF2 play vital roles in nymph–adult transition and are involved in the regulation of chitin metabolism,and SfCht7 is also involved in wing development;therefore,these genes are potential targets for control of S.furcifera. | Xibin Yang Cao Zhou Guiyun Long Hong Yang Chen Chen Daochao Jin | 2021 | Insect Science2021，28，4： | 0 |
| 2 | Controlling factors of remaining oil distribution after water flooding and enhanced oil recovery methods for fracturecavity carbonate reservoirs in Tahe Oilfield显示文摘Based on comprehensive analysis of core, well logging, seismic and production data, the multi-scale reservoir space, reservoir types, spatial shape and distribution of fractures and caves, and the configuration relationship with production wells in fracture-cavity carbonate reservoirs were studied systematically, the influence of them on the distribution of residual oil was analyzed, and the main controlling factors mode of residual oil distribution after water flooding was established. Enhanced oil recovery methods were studied considering the development practice of Tahe oilfield. Research shows that the main controlling factors of residual oil distribution after water flooding in fracture-cavity carbonate reservoirs can be classified into four categories: local high point, insufficient well control, flow channel shielding and weak hydrodynamic. It is a systematic project to improve oil recovery in fracture-cavity carbonate reservoirs. In the stage of natural depletion, production should be well regulated to prevent bottom water channeling. In the early stage of waterflooding, injection-production relationship should be constructed according to reservoir type, connectivity and spatial location to enhance control and producing degree of waterflooding and minimize remaining oil. In the middle and late stage, according to the main controlling factors and distribution characteristics of remaining oil after water flooding, remaining oil should be tapped precisely by making use of gravity differentiation and capillary force imbibition, enhancing well control, disturbing the flow field and so on. Meanwhile, backup technologies of reservoir stimulation, new injection media, intelligent optimization etc. should be developed, smooth shift from water injection to gas injection should be ensured to maximize oil recovery. | ZHENG Songqing YANG Min KANG Zhijiang LIU Zhongchun LONG Xibin LIU Kunyan LI Xiaobo ZHANG Shiliang | 2019 | Petroleum Exploration and Development2019，46，4： | 0 |
| 3 | A federated learning scheme meets dynamic differential privacy显示文摘Federated learning is a widely used distributed learning approach in recent years,however,despite model training from collecting data become to gathering parameters,privacy violations may occur when publishing and sharing models.A dynamic approach is pro-posed to add Gaussian noise more effectively and apply differential privacy to federal deep learning.Concretely,it is abandoning the traditional way of equally distributing the privacy budget e and adjusting the privacy budget to accommodate gradient descent federation learning dynamically,where the parameters depend on computation derived to avoid the impact on the algorithm that hyperparameters are created manually.It also incorporates adaptive threshold cropping to control the sensitivity,and finally,moments accountant is used to counting the∈consumed on the privacy‐preserving,and learning is stopped only if the∈_(total)by clients setting is reached,this allows the privacy budget to be adequately explored for model training.The experimental results on real datasets show that the method training has almost the same effect as the model learning of non‐privacy,which is significantly better than the differential privacy method used by TensorFlow. | Shengnan Guo Xibin Wang Shigong Long Hai Liu Liu Hai Toong Hai Sam | 2023 | CAAI Transactions on Intelligence Technology2023，8，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员