Degradation assessment of waterlogged wood at Haimenkou site

Haimenkou site is the largest railing-enclosed wooden architecture settlement site on the waterfrontin current China. This research conducts degradation assessment of waterlogged wood at Haimenkou site withvarious methods, including maximum moisture content analysis, basic density analysis, shrinkage measurement,swelling analysis, chemical composition analysis, measurement of compression strength parallel to grain, SEMmicrostructure analysis and measurement of crystallinity, providing scientific guidance for the subsequentformulation of proper methods of reinforcement

Key technologies research on of soil-structure interaction base story isolated structure response in 3D seismic zone

The development of karst in Karst area leads to poor stability of stratum. If earthquake occurs, the area will produce destructive disaster. In order to improve the stability capacity of the grassroots in the region, this study investigates the seismic response of inter-story isolation structures considering soil-structure interaction (SSI) in three-dimensional earthquakes. A model of the inter-story isolation structure incorporating SSI was developed, and one-dimensional, two-dimensional, and three-dimensional ground motions were applied to compare the seismic response under different input conditions. A three-dimensional isolation system was introduced and compared with traditional horizontal isolation structures to address excessive tensile and compressive stresses on the isolation structure during three-dimensional ground motion. The results demonstrate that the seismic response to three-dimensional earthquakes surpasses one-dimensional and two-dimensional inputs. Furthermore, adding a three-dimensional isolation structure effectively isolates vertical ground motion and reduces structural seismic response. Moreover, it minimizes soil stresses on the foundation compared to traditional horizontal isolation structure, enhancing foundation stability. This study will provide theoretical value and practical guidance for the research on key technology of SSI base story isolation structure response in Karst Plateau 3D Seismic zone

Design and Research of Urban Video Surveillance System

This paper aimed to design and realized Qiqihar urban video surveillance system and use advanced design solutions to improve the traditional city video surveillance system based on EPON technology. Hierarchical design was proposed and a detailed analysis of each design was given. The system not only has expanded capabilities in the structure, but also has integrated application capabilities in the business, including image transmission, remote monitoring, remote centralized digital image data storage, remote real-time on-demand playback (stored data image). The result shows that the system can completely solve the digitization of the monitoring system and the process of networking bottlenecks. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.363

Short-term wind power probabilistic forecasting based on SSA-VMD-LSTM-NKDE

In order to further improve the accuracy of wind power forecasting, a combined forecasting method based on sparrow search algorithm (SSA) optimizing variational mode decomposition (VMD) parameters was proposed. Firstly, the SSA was used to optimize the VMD parameters, then the optimized VMD was used to decompose the data. Secondly, the entropy weight method and grey relational analysis were combined to analyze the correlation of environmental variables, and the combination of the most relevant influencing factors and the decomposed modal components were selected as the input of the LSTM prediction model to obtain more accurate prediction results. Finally, a wind power probability prediction model based on NKDE was established to effectively quantify the uncertainty of wind power prediction results. The results show that the MAE, RMSE and MAPE of the proposed combination model decrease by 3951%, 33.22% and 40.39%, respectively, compared with the VMD-LSTM model. The SSA-VMD-LSTM-NKDE combination model can not only effectively improve the accuracy of deterministic prediction, but also effectively quantify the uncertainty of wind power prediction results, which provides scientific decision-making basis for wind power prediction

Review of the Functions of Archimedes’ Spiral Metallic Nanostructures

Here, we have reviewed some typical plasmonic structures based on Archimedes’ spiral (AS) architectures, which can produce polarization-sensitive focusing phenomenon and generate plasmonic vortices (PVs) carrying controllable orbital angular momentum (OAM) because of the relation between the incident polarized states and the chiralities of the spiral structures. These features can be used to analyze different circular polarization states, which has been one of the rapidly developing researching topics in nanophotonics in recent years. Many investigations demonstrate that the multifunctional spiral-based plasmonic structures are excellent choices for chiral selection and generating the transmitted field with well-defined OAM. The circular polarization extinction ratio, as an evaluation criterion for the polarization selectivity of a designed structure, could be effectively improved by properly modulating the parameters of spiral structures. Such functional spiral plasmonic nanostructures are promising for applications in analyzing circular polarization light, full Stokes vector polarimetric sensors, near-field imaging, and so on

Research on the Influence of Different Types of Industrial Agglomeration on Ecological Efficiency in Western China

In this study, we used the super-efficient global slacks-based measure of directional distance functions (SBM-DDF) model to evaluate the ecological efficiency and changes in 12 provinces in western China between 2006 and 2020. We then used two linear and nonlinear regression models to analyze in detail the influence mechanisms of different industrial agglomeration forms on the local ecological efficiency. The results show the following: the overall ecological efficiency in the western China region shows a dynamic upward trend. The ecological efficiency of western China is quite different, with the overall characteristics of “high in south and low in north”, “slow in south and fast in north”, and “three-way polarization.” Different types of industrial agglomeration in western China have obvious differences in terms of ecological efficiency. Both specialized agglomeration and unrelated diversification agglomeration in western China have a significant negative impact on ecological efficiency. The relationship between agglomeration-related diversity and ecological efficiency in the western region is of the “U” type. This study’s results can also provide a reference for the formulation of industrial transformation and ecological protection policies in the implementation process of the second round of the western development strategy. This study thus has fundamental significance in the promotion of the second round of western development work

A Ratiometric Biosensor Containing Manganese Dioxide Nanosheets and Nitrogen-Doped Quantum Dots for 2,4-Dichlorophenoxyacetic Acid Monitoring

Nanomaterials are desirable for sensing applications. Therefore, MnO2 nanosheets and nitrogen-doped carbon dots (NCDs) were used to construct a ratiometric biosensor for quantification of 2,4-dichlorophenoxyacetic acid. The MnO2 nanosheets drove the oxidation of colorless o-phenylenediamine to OPDox, which exhibits fluorescence emission peaks at 556 nm. The fluorescence of OPDox was efficiently quenched and the NCDs were recovered as the ascorbic acid produced by the hydrolyzed alkaline phosphatase (ALP) substrate increased. Owing to the selective inhibition of ALP activity by 2,4-D and the inner filter effect, the fluorescence intensity of the NCDs at 430 nm was suppressed, whereas that at 556 nm was maintained. The fluorescence intensity ratio was used for quantitative detection. The linear equation was F = 0.138 + 3.863·C 2,4-D (correlation coefficient R2 = 0.9904), whereas the limits of detection (LOD) and quantification (LOQ) were 0.013 and 0.040 μg/mL. The method was successfully employed for the determination of 2,4-D in different vegetables with recoveries of 79%~105%. The fluorescent color change in the 2,4-D sensing system can also be captured by a smartphone to achieve colorimetric detection by homemade portable test kit

Identification and differentiation of Panax ginseng, Panax quinquefolium, and Panax notoginseng by monitoring multiple diagnostic chemical markers

To differentiate traditional Chinese medicines (TCM) derived from congeneric species in TCM compound preparations is usually challenging. The roots of Panax ginseng (PG), Panax quinquefolium (PQ) and Panax notoginseng (PN) are used as popular TCM. They contain similar triterpenoid saponins (ginsenosides) as the major bioactive constituents. Thus far, only a few chemical markers have been discovered to differentiate these three species. Herein we present a multiple marker detection approach to effectively differentiate the three Panax species, and to identify them in compound preparations. Firstly, 85 batches of crude drug samples (including 32 PG, 30 PQ, and 23 PN) were analyzed by monitoring 40 major ginsenosides in the extracted ion chromatograms (EICs) using a validated LC–MS fingerprinting method. Secondly, the samples were clustered into different groups by pattern recognition chemometric approaches using PLS-DA and OPLS-DA models, and 17 diagnostic chemical markers were discovered. Aside from the previously known Rf and p-F11, ginsenoside Rs1 could be a new marker to differentiate PG from PQ. Finally, the above multiple chemical markers were used to identify the Panax species in 60 batches of TCM compound preparations

Investigation on types of corn rust in eastern Yunnan ecology and analysis of population genetic structure of its rusts

Corn rust disease can be classified into four types: common corn rust, southern corn rust, tropical corn rust and stem corn rust. In this paper, 270 samples of corn rust gathered from Yunnan province were identified by observation of symptom and pathogen morphology, detection of specific molecular markers between Puccinia sorghi Schw and Puccinia polysora Unedrw. The results showed that 180 samples of corn rust collected form Qujing, Zhaotong, Kunming, Honghe (Mile, Kaiyuan and Jianshui) were common corn rust caused by Puccinia sorghi Schw; and 90 samples of corn rust collected form Wenshan and Honghe (Pinbian) were southern corn rust. Morphology and aspect ratio compared Puccinia sorghi Schw with Puccinia polysora Unedrw. The uredospores of Puccinia polysora Unedrw were oval and the aspect ratio of 81.6% of all uredospores from Puccinia polysora Unedrw was greater than 1.2. The uredospores of Puccinia sorghi Schw were nearly round, and their aspect ratio was 1.0-1.3. In addition, the population genetic structure of all corn rust samples was analyzed by ISSR molecular marker. Concerning Puccinia polysora Unedrw, the genetic diversity was larger in Wenshan than in Honghe. In Puccinia sorghi Schw, the population genetic diversity was larger in Zhaotong and the lowest in Kunming