Short-Term Prediction of Photovoltaic Power Based on DBSCAN-SVM Data Cleaning and PSO-LSTM Model

Accurate short-termphotovoltaic(PV)power prediction helps to improve the economic efficiency of power stations and is of great significance to the arrangement of grid scheduling plans.In order to improve the accuracy of PV power prediction further,this paper proposes a data cleaning method combining density clustering and support vector machine.It constructs a short-termPVpower predictionmodel based on particle swarmoptimization(PSO)optimized Long Short-Term Memory(LSTM)network.Firstly,the input features are determined using Pearson’s correlation coefficient.The feature information is clustered using density-based spatial clustering of applications withnoise(DBSCAN),and then,the data in each cluster is cleanedusing support vectormachines(SVM).Secondly,the PSO is used to optimize the hyperparameters of the LSTM network to obtain the optimal network structure.Finally,different power prediction models are established,and the PV power generation prediction results are obtained.The results show that the data methods used are effective and that the PSO-LSTM power prediction model based on DBSCAN-SVM data cleaning outperforms existing typical methods,especially under non-sunny days,and that the model effectively improves the accuracy of short-term PV power prediction.

Influence of chromium on the initial corrosion behavior of low alloy steels in the CO_2–O_2–H_2S–SO_2 wet–dry corrosion environment of cargo oil tankers

The influence of Cr on the initial corrosion behavior of low-alloy steels exposed to a CO2–O2–H2S–SO2 wet–dry corrosion environment was investigated using weight-loss measurements, scanning electron microscopy, N2 adsorption tests, X-ray diffraction analysis, and electrochemical impedance spectroscopy. The results show that the corrosion rate increases with increasing Cr content in samples subjected to corrosion for 21 d. However, the rust grain size decreases, its specific surface area increases, and it becomes more compact and denser with increasing Cr content, which indicates the enhanced protectivity of the rust. The results of charge transfer resistance(Rct) calculations indicate that higher Cr contents can accelerate the corrosion during the first 7 d and promote the formation of the enhanced protective inner rust after 14 d; the formed protective inner rust is responsible for the greater corrosion resistance during long-term exposure.

Comprehensive Evaluation of Tahe Medium Gravity Crude

The comprehensive evaluation of Tahe medium gravity crude has demonstrated that this type of crude belongs to a intermediate base sour crude, featuring high vanadium content (103ppm), high carbon residue content, low pour point, and low acid value. Based on the crude processing conditions at SINOPEC Luoyang Petrochemical Branch Company, a proposal on the appropriate process flow scheme for processing Tahe crude oil has been raised with the main ideas presented as follows. The IBP-175 fraction is not an ideal feedstock for catalytic reforming; the 75-250 fraction is a qualified feedstock for zeolite de-waxing; the 140-230 fraction can be used to manufacture the No. 3 jet fuel through appropriate distillation range adjustment and product refining; the 175-350 fraction can be directly used to manufacture No.-10 diesel through proper refining; the atmospheric resid boiling over 350 is not suited to be used as the RFCC feedstock; the 350-520 vacuum distillate oil can be used as the FCC feedstock; and the vacuum residuum boiling over 520 is a good feedstock for manufacture of asphalt.

Effect of Preparations of Bamboo Vinegar and Copper Sulfate on Green Algae and Tobacco Seedling Growth

To provide theoretical and technical basis for the application of preparations of bamboo vinegar and copper sulfate in the prevention of green algae in floating system for tobacco seeding,the soaking and spraying methods were employed to study the effect of different concentrations of preparations of bamboo vinegar and copper sulfate on green algae and tobacco seedling growth. The results showed that the preparations of bamboo vinegar and copper sulfate of different concentrations played a strong role in inhibiting green algae growth and had better effect than copper sulfate. Spraying 1∶ 200 preparations of bamboo vinegar and copper sulfate could significantly promote tobacco seedling growth,and the leaf fresh weight increased by 15. 80% compared with CK,with significant difference; spraying 1∶ 50 preparations was not conducive to tobacco seedling growth. It was recommended to spray 1∶ 200 preparations of bamboo vinegar and copper sulfate in floating system for tobacco seeding,which could promote tobacco seedling growth and reduce green algae to varying degrees.

Proximate analysis: Relative feed values of various forage plants for ruminants investigated in a semi-arid region of Punjab, Pakistan

The experimental site “Sial Morr Sugar mill, District Sargodha” Punjab, Pakistan was selected to carry out present investigation. The forage samples of Eragrostis pilosa, Dactyloctenium aegyptium, Parthenium hysterophorus and Calotropis procera were collected from the three sites held in this area. The forage samples were cleaned with distilled water to rinse dust particles and other impurities. These forage samples were air dried, oven dried and ground for the assessment of proximate analysis. Proximate analysis procedures including the percentage of moisture content, crude protein, ash contents and crude fiber in the sample were determined by the Association of Official Analytical Chemists methods. The CP contents among different plant species ranged from 8.1% to 26.2% at all sites. The lowest CP value was found in Eragrostis pilosa at site III while the highest CP contents in Dactyloctenium aegyptium at site II. The CP content showed significant (p < 0.05) result among all species at all sites. There was consistence pattern of increase and decrease found during all plant species at all sites. Generally, CP concentration averaged high at site II. Our CP contents are above the critical value. Considering the overall percentage of moisture composition, it was highest at site II. However, the moisture was found more in Calotropis procera at site II. The Dactyloctenium aegyptium had the least moisture content of 3.9% while the highest water content of 7%. Ash contents varied from 7.2% to 17.9% among various plant species at all sampling sites. The lowest ash contents were recorded in Dactyloctenium aegyptium at site III. At site II, ash contents were highest in Eragrostis pilosa. The differences between ash contents of various plant species were significant (p < 0.05) at all sampling site. Generally, the ash contents were higher at site II. Crude fiber contents differed significantly (p Parthenium hysterophorus had greater crude fiber contents at site II while the lowest value of CF found in Dactyloctenium aegyptium at site I. The differences were significant between all plant species other than the Specie I at all sites. The values ranged from 1.2% to 4.1%. It was highest in Parthenium hysterophorus (4.1%) at site I and least in Dactyloctenium aegyptium (1.2%) at site III. Maximum ether extract value was achieved at site I.

Promising Actions of Certain Medicinal Plants of Bangladesh against Diabetes and Oxidative Stress: A Review

Diabetes is a metabolic illness defined by hyperglycemia that affects 10% of the world’s population. Diabetic complications such as blindness, kidney failure, and heart failure can develop if left untreated and are made worse by oxidative stress. Oxidative stress contributes to the rise of diabetic complications, particularly type-2 diabetes. In the blood vessels of diabetic individuals, it causes endothelial dysfunction. Diabetes is one of the leading causes of death worldwide. Nowadays, it is alarming that the number of diabetic patients is increasing dramatically. There are plenty of anti-diabetic drugs available on the market, but they possess several adverse effects and do not completely cure diabetes. It has now become a financial burden on patients, their families, and society as well. Medicinal plants have gained popularity in developed and developing countries over the last two decades because of their vast natural sources and lack of harmful effects compared to modern allopathic medications. According to the World Health Organization, traditional medicines, which are mostly manufactured from plants, are still used by 80% of the population in developing countries for the management and curing of diseases. This review includes 81 Bangladeshi medicinal plants from 51 different families that can be used to treat diabetes and oxidative stress. Among them, Psidium guajava (L.), Aloe vera, Catharanthus roseus, Allium sativum, Annona squamosa, Cinnamon zeylaniucm, Amaranthus esculentus, Eugenia jambolana, Azadirachta indica, Moringa oleifera, Spondias pinnata, Coccinia grandis (L.), Momordica charantia L., Heretiera fomes, Trigonella foenum-graecum were most potent. The fundamental purpose of our study is to find out and highlight certain medicinal plants in Bangladesh that have anti-diabetic and antioxidant capabilities so that the researchers can develop newer anti-diabetic medications with minimal side effects to treat metabolic dysfunction, diabetic complications, and oxidative stress more effectively.

Exploration of concentration of two macro-minerals in different wild forages in relation to nutrient requirements of livestock

The composition of two macro-minerals (Ca and Na) was examined in soil and forages in two fields of District Sargodha, Pakistan. During winter and summer season, soil and forage samples were collected. In both seasons, Na was sufficient in soil and forages. As compared to the winter season, the Na and Ca levels in soil were considerably higher in summer season. In forages, the level of Ca was deficient than the level which is essential for livestock growth. In the pastures, grazing livestock may be?deficient in these minerals as these pastures are not supplying sufficient minerals to the ruminants grazing therein. Supplementation of minerals is necessary to prevent the mineral imbalances and deficiency diseases in grazing livestock.

Spatiotemporal graph queries on geographic databases under a conceptual abstraction scale

Visual queries assist non-expert users to extract information from spatial databases in an intuitive and natural approach,making Geographic information systems comprehensive and efficient for a wide range of applications.A common visual means of querying takes the form of drawings or graphs,under which many spatial ambiguity and translation errors rise.In this study,common query attributes extracted from user graphs such as spatial topology,size,cardinality,and proximity are regarded under a conceptual moderation scheme.Thus,the system/user may concentrate on various conceptual combinations of information.Furthermore,time is incorporated to support spatiotemporal queries for changing scenes and moving objects.Arbitrary,relative,and absolute scaling is possible according to the data-set and application at hand.The theoretic approach is implemented under a prototype user interface system,called ShapeController.Under this prototype,a user may extract scene-based relations in an automatically inferred fashion,or include single object-oriented relations when all possible relations seem redundant.Finally,a natural language description of the query is extracted upon which the user may select the desired query relations.Experimentation on a spatial database demonstrates the concepts of predefined draw objects,scaling relaxation,conceptual abstraction,and scene,object-and textual-oriented transitions that promote query expressiveness and restrain ambiguities.