Subjects: Nuclear Science and Technology >> Other Disciplines of Nuclear Science submitted time 2024-04-25
Abstract： Abstract [Background]: Complex lithology well sections require high precision in density logging data, and traditional computational models cannot adequately meet the high precision requirements in these cases. [Purpose]: This study aims to improve the precision of density logging curves using machine learning regression prediction models. [Method]: Firstly, SSA algorithm was used to improve XGBoost, leading to the development of the SSA-XGBoost density prediction model. Then, Monte Carlo N-Particle transport code（MCNP） of dual-detector density logging tool instrument was used to obtain stratigraphic data of different densities to validate the predictive effectiveness of the model. By optimizing the parameters of SVR, RFR, and LSTM using the SSA, the SSA-SVR, SSA-RFR, and SSA-LSTM models were constructed to predict the simulated formation density. The predictive performance of each model was compared and analyzed using quantitative evaluation metrics and Taylor diagram models. Finally, the performance of different prediction models on actual density logging data was analyzed. [Result]: In the comparative analysis and processing of actual well density logging data with various models, the SSA-XGBoost model showed smaller errors between predicted and actual density, demonstrating high density accuracy and validating the precision of the method. [Conclusion]: The SSA-XGBoost model demonstrates higher predictive accuracy than traditional spine-ribs plot, showing great potential for applications in the processing of actual density logging data.
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：随着我国经济的飞速发展,科技发生了飞跃性的变化,一种新型媒体逐渐出现在众人的视野中。各种媒体的出现无疑对电视行业产生了一些影响,但这种影响并不是不可逆的,各城市台可以合理利用现有媒体局面,打造出更好更强的形象,从众多媒体的冲击中突围出来。下面笔者将浅谈城市台在媒体发展迅速的大环境下突围的新思路,希望能给各界人士带来一些想法。如有不足之处,还希望能够多多指正。
Subjects: Library Science，Information Science >> Library Science submitted time 2023-07-26 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] Aiming at the current public opinion response problem of multimedia network in China, this paper combs and proposes the mechanism of government organization response path integration matching and response workflow model based on crisis risk classification. In order to improve the resource integration ability for management decision-makers, the network public opinion crisis provides a reference for the accurate response effectiveness.[Method/process] This paper analyzes the role of the dynamic factors of network public opinion crisis in big data environment, extracts the basic coefficients of network public opinion crisis risk classification, and extracts the network public opinion crisis risk classification superposition coefficient from the perspective of the multi-structure of network public opinion information carried by multimedia technology. Then the paper analyzes the work points of the network public opinion crisis response under each risk classification one by one.[Result/conclusion] According to the ordering combination of the main structural elements, the media effectiveness factors and the object attribute elements, the credit base level of the multimedia network is established on the relationship nodes. According to the different influence effects of the ontology component on the public opinion crisis, the public opinion crisis of the big data multimedia network is established. Establishing a multimedia network public opinion crisis risk classification model, deconstructing the public opinion crisis risk into a ranking coefficient and an addition coefficient, and a more accurate description of the lyric crisis is conducive to judging the future development of the grievance crisis and improving the speed and accuracy of matching with the previous grievance crisis case.
Subjects: Library Science，Information Science >> Library Science submitted time 2023-07-26 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance]The formation of the willingness to disseminate network public opinion is a psychological activity of netizens, which is inseparable from psychological distance. Understanding the main factors that influence the willingness to disseminate network public opinion will help the supervising and controlling departments to conduct pre-warning and management of network public opinion more effectively.[Method/process] Based on the deep analysis of the psychological distance theory, this paper expounds the constitution of the psychological distance, and makes a series of theoretical assumptions in the view of time distance, spatial distance, social distance and probability. Then it identifies the main factors and their importance using questionnaire method and optimal scale regression analysis method.[Result/conclusion] Finally, it concludes 7 main factors that influence netizens to change their disseminate willingness which contain the reporting time, home related, yearning related, life related, relatives and friends release, media official release, enterprise official release. Monitoring the public opinion from these seven factors will help the supervising and controlling departments controlling the direction of public opinion dissemination more pertinently.
Subjects: Biology >> Botany submitted time 2023-03-28 Cooperative journals: 《干旱区研究》
Abstract： Natural precipitation is an important source of water for vegetation in arid areas. To explore the coping methods of desert shrubs under different precipitation conditions, this study selected typical desert shrubs as subject and determined their leaf morphological traits and stoichiomental characteristics under different precipitation condition. The overall characteristics of leaf functional traits and the relationship between individual functional properties and environmental factors were also analyzed. Results showed that (1) with the decrease in natural precipitation, the degree of fleshiness and water content of leaves of Reaumuria soongorica increased gradually and the tissue density of Kalidium foliatum increased. (2) Meanwhile, the C contents in the leaves of R. soongorica and Nitraria tangutorum and the N contents in the leaves of N. tangutorum and Salsola passerina showed an overall increasing trend with the increase in drought stress. In addition, the leaf N∶P ratios of S. passerina and K. foliatum were all less than 14, indicating that the growth and development of these species were mainly restricted by nitrogen. (3) The leaf tissue density of R. soongorica, N. tangutorum, and K. foliatum was positively correlated with the average annual precipitation. The specific leaf area of R. soongorica and N. tangutorum and the P content of R soongorica, N. tangutorum, and S. passerina were negatively correlated with altitude. In arid environments, different plants exhibit different ecological adaptation strategies. To adapt to the desert environment of drought and less rainfall, K. foliatum reduces its specific leaf area and increases its tissue density, N. tangutorum increases the N content of its leaves, and R. soongorica increases the degree of fleshiness and water content of its leaves. Average annual precipitation and altitude are the main limiting factors affecting their growth and development.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2019-05-10 Cooperative journals: 《计算机应用研究》
Abstract： By deploying cyber security devices, cyber security can be effectively improved. But due to the varieties and complex function of cyber equipment, how to optimize the deployment of cyber security devices is still a core problem for researchers.By turning the deployment of cyber security equipment into a pareto optimization problem,this paper put forward a tuple, a distributed constraint optimization, to quantify the deployment of cyber security device. Then, the algorithm, based on branch and bound algorithm, is used to calculate the quantized values to find out the optimal solution within solution space. And it takes a lot of time to run the algorithm, based on branch and bound algorithm, which is infeasible in large networks. This paper proposes to use the data preprocessing technology to optimize the search, which is based on arc consistency technology. This paper computed the quantized value in advance and make the search become an easy problem. Finally, it used the simulation experiments to prove the correctness and effectiveness of the proposed approaches.
Subjects: Biology >> Ecology submitted time 2018-05-18 Cooperative journals: 《生态学报》
Abstract：为探究三峡库区消落带水位变化下落羽杉根系有机酸和非结构性碳水化合物（NSC）的响应特征，以适生木本植物落羽杉为对象，在消落带原位环境中设置对照-SS（海拔175 m，试验期间无水淹）、MS（海拔170 m，中度水淹胁迫）和DS（海拔165 m，深度水淹胁迫）3个处理，分别于海拔170 m和165 m退水时采集样品，测定并分析根系有机酸和NSC的变化。结果表明：（1）库区水淹对落羽杉基径无显著影响，仅有DS组明显抑制了高生长，落羽杉生长能较积极地响应库区水淹。（2）库区水淹对落羽杉侧根和总根有机酸的影响一致，侧根有机酸代谢作用优于主根。与SS组相比，MS组根系有机酸含量增高，DS组根系有机酸含量降低，除部分根系酒石酸、苹果酸、柠檬酸变化达到显著水平外，其余有机酸均无显著变化。（3）库区不同强度水淹对落羽杉根系NSC有不同程度的影响。与SS组相比，MS组可溶性糖无显著变化，淀粉、NSC含量显著增加，但总根NSC在水淹前与水淹后无明显差异；形成鲜明对比的是，DS组显著降低了可溶性糖、NSC含量，对淀粉无显著影响，且水淹后总根NSC显著低于水淹前。（4）相关分析表明，主根、总根草酸、苹果酸、柠檬酸及侧根、总根莽草酸分别与淀粉、NSC间表现出显著相关性（P<0.05）。研究结果表明，在三峡库区消落带水淹胁迫下，落羽杉根系有机酸与NSC代谢联系紧密。通过维持一定的根系淀粉含量，保持植株正常的有机酸代谢水平，较好地适应三峡库区消落带生境。
Subjects: Biology >> Zoology submitted time 2017-10-10 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究无抗生素饲粮中添加德氏乳杆菌对育肥猪胴体性状、肉品质及背最长肌营养成分的影响。试验选用健康、平均体重为（65.34±3.64） kg的“杜×（长×大）”育肥猪120头，随机分为2个组，每组6个重复，每个重复10头猪（公母各占1/2）。对照组饲喂无抗生素基础饲粮，试验组饲喂在无抗生素基础饲粮中添加0.1%德氏乳杆菌的饲粮。试验期42 d。结果表明：2组育肥猪的胴体性状差异不显著（P>0.05）；与对照组相比，试验组育肥猪的脾重率和胰重率显著升高（P0.05），宰后24 h时，与对照组相比，试验组育肥猪肉的黄度显著升高（P<0.05），剪切力显著降低（P<0.05）；与对照组相比，试验组育肥猪背最长肌中甘氨酸、丙氨酸和风味氨基酸含量显著升高（P<0.05），葵酸和棕榈酸含量显著降低（P<0.05），棕榈油酸、亚油酸和多不饱和脂肪酸含量显著升高（P<0.05）。结果提示，无抗生素饲粮中添加0.1%德氏乳杆菌对育肥猪的胴体性状、肉品质及肉中营养成分具有一定改善作用。
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