Purpose-The indoor vibration compaction test(IVCT)was a key step in controlling the compaction quality for high-speed railway graded aggregate(HRGA),which currently had a research gap on the assessment indicators and ...Purpose-The indoor vibration compaction test(IVCT)was a key step in controlling the compaction quality for high-speed railway graded aggregate(HRGA),which currently had a research gap on the assessment indicators and compaction parameters.Design/methodology/approach-To address these issues,a novel multi-indicator IVCT method was proposed,including physical indicator dry density(ρd)and mechanical indicators dynamic stiffness(Krb)and bearing capacity coefficient(K20).Then,a series of IVCTs on HRGA under different compaction parameters were conducted with an improved vibration compactor,which could monitor the physical-mechanical indicators in real-time.Finally,the optimal vibration compaction parameters,including the moisture content(ω),the diameter-to-maximum particle size ratio(Rd),the thickness-to-maximum particle size ratio(Rh),the vibration frequency(f),the vibration mass(Mc)and the eccentric distance(re),were determined based on the evolution characteristics for the physical-mechanical indicators during compaction.Findings-All results indicated that theρd gradually increased and then stabilized,and the Krb initially increased and then decreased.Moreover,the inflection time of the Krb was present as the optimal compaction time(Tlp)during compaction.Additionally,optimal compaction was achieved whenωwas the water-holding content after mud pumping,Rd was 3.4,Rh was 3.5,f was the resonance frequency,and the ratio between the excitation force and the Mc was 1.8.Originality/value-The findings of this paper were significant for the quality control of HRGA compaction.展开更多
The evaluation problem with three-parameter interval grey number (T-PIGN) widely exists in real world. To select effective evaluation indicators of the problem, this paper puts forward evaluation index system selectio...The evaluation problem with three-parameter interval grey number (T-PIGN) widely exists in real world. To select effective evaluation indicators of the problem, this paper puts forward evaluation index system selection principle of T-PIGN based on distance entropy model, and gives out evaluation index system selection judgment criterion of T-PIGN. Furthermore, for the redundancy of evaluation index system with T-PIGN, a selection method of evaluation index system with T-PIGN is proposed. Finally, the applicability of the proposed method is verified by concrete examples.展开更多
Ganga river basins exposed to active erosional and deformational processes. The recurrence of landslides, floods, and seismic activities makes it more susceptible to deformational activities. The tectonic analysis usi...Ganga river basins exposed to active erosional and deformational processes. The recurrence of landslides, floods, and seismic activities makes it more susceptible to deformational activities. The tectonic analysis using geomorphic indices and morphometric parameters will help in determining the hazard-prone area of the river basin. Geomorphic indices and morphometric parameters are calculated to investigate the role of neotectonic activities, as it acts as a controlling factor in the development of landforms in the tectonically active terrains. Neotectonic activities influence the terrain topography, which significantly affects the drainage system and geomorphological setup of the area. In this study, the assessment of active tectonics of study area was determined using Advanced Spaceborne Thermal Emission and Reflection Radiometer(ASTER) Global Digital Elevation Model(GDEM) based on Geomorphic Indices(Stream Length Gradient index, Hypsometric integral, Asymmetry factor, Basin shape, Valley floor width to Valley height ratio, Mountain front sinuosity index) cumulatively with Linear, Areal and Relief morphometric parameters on 27 delineated basins of the study area. The combined classification of Relative Tectonic Activity Index(Iat) and morphometric parameters of 27 basins categorized all the zones into four different classes:Class 1 – Very High(<1.97;410 km^2);Class 2 – High(1.97 – 2.05;275 km^2);Class 3 – Moderate(2.05 – 2.21;273 km^2),and Class 4 – Low(>2.21;299 km^2). The basins with tectonic activities have a consistent relationship with structural disturbances, basin geometry, and field studies. The tectonically active zonation of a part of Ganga basin using geomorphic indices and morphometric parameters suggest that it has significant influence of neotectonic activities in a part of Ganga basin.展开更多
Rock bursts have become one of the most severe risks in underground coal mining and its early warning is an important component in the safety management. Microseismic(MS) monitoring is considered potentially as a powe...Rock bursts have become one of the most severe risks in underground coal mining and its early warning is an important component in the safety management. Microseismic(MS) monitoring is considered potentially as a powerful tool for the early warning of rock burst. In this study, an MS multi-parameter index system was established and the critical values of each index were estimated based on the normalized multi-information warning model of coal-rock dynamic failure. This index system includes bursting strain energy(BSE) index, time-space-magnitude independent information(TSMII) indices and timespace-magnitude compound information(TSMCI) indices. On the basis of this multi-parameter index system, a comprehensive analysis was conducted via introducing the R-value scoring method to calculate the weights of each index. To calibrate the multi-parameter index system and the associated comprehensive analysis, the weights of each index were first confirmed using historical MS data occurred in LW402102 of Hujiahe Coal Mine(China) over a period of four months. This calibrated comprehensive analysis of MS multi-parameter index system was then applied to pre-warn the occurrence of a subsequent rock burst incident in LW 402103. The results demonstrate that this multi-parameter index system combined with the comprehensive analysis are capable of quantitatively pre-warning rock burst risk.展开更多
Drought and salinity are the most widespread soil problems, posing a big threat to food security in rice growing regions. The present study evaluated the performance of eleven rice genotypes using morphological and ph...Drought and salinity are the most widespread soil problems, posing a big threat to food security in rice growing regions. The present study evaluated the performance of eleven rice genotypes using morphological and physiological parameters, under induced drought and salinity conditions. The seedlings were raised in 5 kg of homogenous soil in plastic bags in the </span><span style="font-family:Verdana;">greenhouse</span><span style="font-family:""><span style="font-family:Verdana;">. For the drought experiment, each bag was watered with 200 ml of water twice daily until plants reached the five-leaf stage when watering was suspended for 2 weeks for the drought stressed plants but not suspended for the control plants. The experiment was a 2 × 11 factorial and the set up was arranged using the completely randomized design with three replications. Data were taken on Plant height, Number of tillers, leaf length, Number of green leaves, Number of dead leaves, Leaf rolling score (LRS) and Rate of water loss. The salinity experiment was set up in a similar manner except that the plants were irrigated twice a day for 2 weeks with 200 ml of treatment solution containing either 0 mM NaCl or 75 mM and data were collected on plant height, number of tillers, shoot fresh weight, shoot dry weight, Na</span><sup><span style="font-family:Verdana;">+</span></sup><span style="font-family:Verdana;"> and K</span><sup><span style="font-family:Verdana;">+</span></sup><span style="font-family:Verdana;"> concentrations, relative water content and chlorophyll content. Data from both experiments were subjected to Analysis of variance test using the GenStat software 10</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;"> edition and the means separated using least significant difference test. Individual stress response index (ISRI) was calculated for each parameter and the means used in grouping the varieties. Of the genotypes evaluated, four (FARO 44, NERICA 2, NERICA 8 and NERICA 5) were identified as tolerant, two (NERICA 4 and FARO 57) as moderately tolerant, while the rest were found to be sensitive to drought. Equally, two varieties (FARO 44 and RAM 137) stood out in the salinity screening as tolerant varieties, five were moderately tolerant while four (FARO 64, FARO 52, NERICA 2 and FARO 55) were clearly susceptible. FARO 44 is the only genotype that </span><span style="font-family:Verdana;">showed </span></span><span style="font-family:Verdana;">tolerance</span><span style="font-family:""> </span><span style="font-family:Verdana;">to both drought and salinity. The identified drought and salinity tolerant rice genotypes from this study can be recommended as genetic sources for future breeding programs for drought and salinity </span><span style="font-family:Verdana;">tolerance</span><span style="font-family:""> </span><span style="font-family:Verdana;">in rice.展开更多
The control problem of a class of parabolic distributed parameter systems (DPSs) is investigated by using mobile agents with capabilities of sensing and actuating. The guidance strategies of mobile agents based on cov...The control problem of a class of parabolic distributed parameter systems (DPSs) is investigated by using mobile agents with capabilities of sensing and actuating. The guidance strategies of mobile agents based on coverage optimization methods are proposed to improve the control performance of the system and make the state norm of the system converge to zero faster. The coverage optimization problems are constructed based on the measurement of each agent. By solving the coverage optimization problems, the local optimal moving direction of each agent can be obtained. Then the gradient-based agent motion control laws are established. With the indicator function and the surface delta function, this method is generalized to n-dimensional space, and suitable for any sensing region with piecewise smooth boundaries. The stability and control performance of the system are analyzed. Numerical simulations show the effectiveness of the proposed methods.展开更多
With 178 West African Dwarf sheep aged 1 to 3 years, a study was conducted to investigate the effects of coat colour genes on body measurements, heat tolerance traits and haematological parameters. Body measurements c...With 178 West African Dwarf sheep aged 1 to 3 years, a study was conducted to investigate the effects of coat colour genes on body measurements, heat tolerance traits and haematological parameters. Body measurements considered included body length, hair length, ear length, hip width, tail length, height at withers, rump height, fore cannon bone length, chest depth, heart girth and body weight. Heat tolerance traits considered were skin temperature, rectal temperature, pulse rate and respiratory rate. Blood samples were collected for the evaluation of white blood cell (WBC), red blood cell (RBC), haemoglobin (HGB), haematocrit (HCT), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin cell (MCHC), red cell distribution width (RDW), platelets (PLT), mean platelets volume (MPV), platelets distribution width (PDW) and plateletcrits (PCT). Results showed that coat colour gene (CCG) had significant (P < 0.01) effect on rump height and tail length. Animals with black (BB) coat colour had the highest mean value for rump height (57.80 ± 1.29 cm) and tail length (22.10 ± 0.89 cm), while brown (Bb) coat colour had the least value of 53.00 ± 6.00 cm for rump height and 17.50 ± 0.50 cm for tail length. The CCG had significant (P < 0.01) effect on body temperature and pulse rate, with the grey/mouflon (Ag) colour possessing the highest body temperature (38.90°C ± 0.22°C), and Bb having the least value of 37.20°C ± 0.35°C. White/tan (Awt) had the highest pulse rate of 28.90 ± 0.66 beats/min and Bb had the least value of 20.00 ± 2.00 beats/min. The CCG had significant (P < 0.01) effect on RBC and MPV with brown (Bb) colour having the highest RBC counts (18.20 ± 0.00 L) and badgerface (Ab) having the least value (11.50 ± 0.62 L). The Bb had the highest value (5.60 ± 0.00 fL) for MPV and Ab had the least value (4.70 ± 0.15 fL). Sheep with Bb and Ab were found to withstand heat stress better than others.展开更多
The aim of this study was to evaluate the effects of thermooxidation of S. ochocoa oil on its quality and on the biochemical and anthropometric parameters of Wistar rats. S. ochocoa seeds from the Lekoumou department ...The aim of this study was to evaluate the effects of thermooxidation of S. ochocoa oil on its quality and on the biochemical and anthropometric parameters of Wistar rats. S. ochocoa seeds from the Lekoumou department were used for oil extraction at the press. The parameters measured were oil content and chemical indices, determined for samples of oil unheated and heated to 220˚C as a function of the number of heatings and the environment (open air, freezer). Two diets were created: the control diet and the treated diet, in which 10% oil was substituted for the control diet. These diets were fed to the rats for 28 days. Biochemical, anthropometric and atherogenicity parameters were measured. The results show that S. ochocoa oil has a saturated character and a blackish color, and it solidifies or coagulates rapidly. Unheated oil samples placed in a freezer and unheated samples placed in a simple freezer have relatively lower acid values (0.860 and 0.703 mg KOH/g respectively) than other samples. Acid index values for heated samples increase progressively with the number of heatings (1.063 ± 0.005 for 1st heating, 1.290 ± 0.010 for 2nd heating and 1.890 ± 0.006 for 3rd heating). The oil’s peroxide value increased with temperature and oxidation (65.6 ± 0.03 for unheated oil vs. 97.9 ± 003 for oil heated to 220˚C). The diet supplemented with this oil resulted in a significant increase in plasma cholesterol levels, and a significant decrease in triglyceride levels. The plasma atherogenicity index reveals the risk of cardiovascular disease associated with this food.展开更多
Objective: to analyze the results and application value of erythrocyte parameters in blood test in the differential diagnosis of anemia. Methods: 138 cases of anemia patients admitted to our hospital in May 2020 (01-3...Objective: to analyze the results and application value of erythrocyte parameters in blood test in the differential diagnosis of anemia. Methods: 138 cases of anemia patients admitted to our hospital in May 2020 (01-30) were taken as the research object, and set as the observation group. A total of 138 healthy subjects who underwent physical examination in our hospital during the same period were selected as the reference group. In the blood test of all subjects, the red blood cell analyzer is used to measure and record the parameters. Results: after examination, 138 cases of anemia in the observation group were identified as iron deficiency anemia, hemolytic anemia, megaloblastic anemia, aplastic anemia, liver and kidney disease and blood loss. There was significant difference between the observation group and the control group in the RBC parameters of the two groups (P < 0.05). Among them, Hb and RBC of hemolytic anemia and megaloblastic anemia patients were lower than those of the control group, while MCV, RDW and MCH were higher than those of the control group (P < 0.05). Compared with the reference group, the Hb and RBC of other anemia patients were lower (P < 0.05). Conclusion: the blood test for anemia patients can determine the parameters of red blood cells, and identify the type of anemia according to the level of each index, which provides reliable basis for the formulation of treatment plan and has strong possibility of popularization.展开更多
The utilization of palynological data for plant diversity reconstructions offers notable advantages in addressing the discontinuity of plant fossils in the stratigraphic record. However, additional studies of modern p...The utilization of palynological data for plant diversity reconstructions offers notable advantages in addressing the discontinuity of plant fossils in the stratigraphic record. However, additional studies of modern processes are required to validate or refine the accuracy of diversity results obtained from palynological data. In this study, we used a modern pollen dataset of China to compare the accuracy of plant diversity reconstructions using five different palynological diversity indices(i.e., the pollen species number, Berger-Parker index, Simpson diversity index, Hill index, and Shannon-Wiener index) over a large spatial scale. We then identified climate factors that are most strongly correlated with these patterns of plant diversity. We found that the index that most accurately reflects plant diversity is the Shannon-Wiener index. Our analyses indicated that the most effective indices at reflecting plant diversity are the Shannon-Wiener index and Berger-Parker index. Numerical analysis revealed that palynological diversity(measured using the Shannon-Wiener index) was strongly correlated with climatic parameters, in particular average temperature in the coldest month and annual precipitation,suggesting these factors may be primary determinants of plant diversity distribution. We also found that a threshold value of the normalized Shannon-Wiener index(NH = 0.4) approximately aligns with the contour line specifying 400 mm annual precipitation, serving as a rudimentary indicator for assessing plant diversity in arid versus humid climates. This study suggests that pollen diversity indices have remarkable potential for quantitatively reconstructing paleoclimatic parameters.展开更多
Objective:To investigate the loxic implications of ethanolic stem bark extract of Azadirachta indica(A-indica)at 50,100,200 and 300 mg/kg body weight in Wistar rats.Methods:Fifty male rats of Wistar strains were rando...Objective:To investigate the loxic implications of ethanolic stem bark extract of Azadirachta indica(A-indica)at 50,100,200 and 300 mg/kg body weight in Wistar rats.Methods:Fifty male rats of Wistar strains were randomly grouped into five(A-F.)of ten animals each.Animals in Group A(control)were orally administered 1 mL of distilled water on daily basis for 21 days while those in Groups B-E received same volume of the extract corresponding to 50,100,200 and 300mg/kg body weight.Results:The extract did not significantly(P>0.05)alter the levels of albumin,total protein,red blood cells and factors relating to it whereas the white blood cell,platelets,serum triacylglycerol and high-density lipoprotein cholesterol decreased significantly(P<0.05).In contrast,the final body weights,absolute weights of the liver,kidney,lungs and heart as well as their organ-body weight ratios,serum globulins,total and conjugated bilirubin,serum cholesterol,low-density lipoprotein cholesterol and computed atherogenic index increased significantly.The spleen-body weight ratio,alkaline phosphatase,alanine and aspartate transaminases,sodium,potassium,calcium,feed and water intake were altered at specific doses.Conclusions:Overall,the alterations in the biochemical parameters of toxicity have consequential effects on the normal functioning of the organs of the animals.Therefore,the ethanolic extract of A.indica stem bark at the doses of 50,100,200 and 300 mg/kg body weight may not be completely safe as an oral remedy and should be taken with caution if absolutely necessary.展开更多
Drought is one of the major environmental threats in the world. In recent years, the damage from droughts to the environment and economies of some countries has been extensive, and drought monitoring has caused widesp...Drought is one of the major environmental threats in the world. In recent years, the damage from droughts to the environment and economies of some countries has been extensive, and drought monitoring has caused widespread concerns. Remote sensing has a proven ability to provide spatial and temporal measurements of surface properties, and it offers an opportunity for the quantitative assessment of drought indicators such as the vegetation water content at different levels. In this study, sites of cotton field in Shihezi, Xinjiang, Northwest China were sampled. Four classical water content parameters, namely the leaf equivalent water thickness （EWT^e,f）, the fuel moisture content （FMC）, the canopy equivalent water thickness （EVVmcanopy） and vegetation water content （VWC） were evaluated against seven widely-used water-related vegetation indices, namely the NDII （normalized difference infrared index）, NDWI2130 （normalized difference water index）, NDVI （normalized difference vegetation index）, MSI （moisture stress index）, SRWI （simple ratio water index）, NOWI1240 （normalized difference water index） and WI （water index）, respectively. The results proved that the relationships between the water-related vegetation indices and EWTleaf were much better than that with FMC, and the relationships between vegetation indices and EWTcanopy were better than that with VWC. Furthermore, comparing the significance of all seven water-related vegetation in- dices, WI and NDII proved to be the best candidates for EWT detecting at leaf and canopy levels, with R2 of 0.262 and 0.306 for EWTlear-WI and EWTcanopy-NDII linear models, respectively. Besides, the prediction power of linear regression technique （LR） and artificial neural network （ANN） were compared using calibration and validation dataset, respectively. The results indicated that the performance of ANN as a predictive tool for water status meas- uring was as good as LR. The study should further our understanding of the relationships between water-related vegetation indices and water parameters.展开更多
Water quality indices (WQI) are useful tools for indicating the suitability of water for an expected use. However, they can suffer from some problems. The objective of this paper was to analyze the development of WQI ...Water quality indices (WQI) are useful tools for indicating the suitability of water for an expected use. However, they can suffer from some problems. The objective of this paper was to analyze the development of WQI to determine which parameters are used in water quality assessment and to discuss the characteristics of WQI. To screen articles on WQI, the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) method is applied to include or exclude articles. Four necessary steps are needed to design WQI: parameter selection, standardization, weighting and aggregation. A set of six methods of aggregations of sub-indices are identified: the arithmetic mean, the geometric mean, the root square, the logarithmic function, the fuzzy inference and the minimum operator. The problems encountered for the overall index are different according to the form of aggregation. They are eclipsing, ambiguity, rigidity or flexibility, adaptability and compensation. The chemical parameters (70%) are the most used in the development of WQI with the physical parameters used at 24% and the biological parameters at 6%. Dissolved oxygen (DO, 87%), total coliforms (87%), biological oxygen demand (BOD, 73%), pH (73%), temperature (67%), turbidity (60%), ammonia (53%), ammonium (47%) and total dissolved solids (47%) are the most commonly used parameters for water quality assessment.展开更多
The mathematical model of single degree of freedom(DOF)nonlinear autonomous bearing system under constant flow supporting model is deduced.The single DOF nonlinear autonomous bearing system is transformed with the met...The mathematical model of single degree of freedom(DOF)nonlinear autonomous bearing system under constant flow supporting model is deduced.The single DOF nonlinear autonomous bearing system is transformed with the method of linear and nonlinear treatment,the mathematical expression and parameters sensitivity of relative error of stiffness and damping are presented.Finally,the main factors of magnetic-liquid double suspension bearing(MLDSB)are analyzed,and the influence on bearing performance indicators of single DOF nonlinear autonomous bearing system of main factors is revealed.The results show that linear stiffness/damping is the first part of equivalent stiffness/damping,and the second and third parts are high order minor term of Tayor series transform.The film thickness,the magnetic-liquid proportionality coefficient,the mass of rotor are the major influence factor of the bearing performance.The research can provide the theoretical reference for the design and nonlinear analysis of MLDSB.展开更多
基金funded by the National Key R&D Program“Transportation Infrastructure”project(No.2022YFB2603400)the Technology Research and Development Plan Program of China State Railway Group Co.,Ltd.(No.Q2024T001)the National project pre research project of Suzhou City University(No.2023SGY019).
文摘Purpose-The indoor vibration compaction test(IVCT)was a key step in controlling the compaction quality for high-speed railway graded aggregate(HRGA),which currently had a research gap on the assessment indicators and compaction parameters.Design/methodology/approach-To address these issues,a novel multi-indicator IVCT method was proposed,including physical indicator dry density(ρd)and mechanical indicators dynamic stiffness(Krb)and bearing capacity coefficient(K20).Then,a series of IVCTs on HRGA under different compaction parameters were conducted with an improved vibration compactor,which could monitor the physical-mechanical indicators in real-time.Finally,the optimal vibration compaction parameters,including the moisture content(ω),the diameter-to-maximum particle size ratio(Rd),the thickness-to-maximum particle size ratio(Rh),the vibration frequency(f),the vibration mass(Mc)and the eccentric distance(re),were determined based on the evolution characteristics for the physical-mechanical indicators during compaction.Findings-All results indicated that theρd gradually increased and then stabilized,and the Krb initially increased and then decreased.Moreover,the inflection time of the Krb was present as the optimal compaction time(Tlp)during compaction.Additionally,optimal compaction was achieved whenωwas the water-holding content after mud pumping,Rd was 3.4,Rh was 3.5,f was the resonance frequency,and the ratio between the excitation force and the Mc was 1.8.Originality/value-The findings of this paper were significant for the quality control of HRGA compaction.
文摘The evaluation problem with three-parameter interval grey number (T-PIGN) widely exists in real world. To select effective evaluation indicators of the problem, this paper puts forward evaluation index system selection principle of T-PIGN based on distance entropy model, and gives out evaluation index system selection judgment criterion of T-PIGN. Furthermore, for the redundancy of evaluation index system with T-PIGN, a selection method of evaluation index system with T-PIGN is proposed. Finally, the applicability of the proposed method is verified by concrete examples.
文摘Ganga river basins exposed to active erosional and deformational processes. The recurrence of landslides, floods, and seismic activities makes it more susceptible to deformational activities. The tectonic analysis using geomorphic indices and morphometric parameters will help in determining the hazard-prone area of the river basin. Geomorphic indices and morphometric parameters are calculated to investigate the role of neotectonic activities, as it acts as a controlling factor in the development of landforms in the tectonically active terrains. Neotectonic activities influence the terrain topography, which significantly affects the drainage system and geomorphological setup of the area. In this study, the assessment of active tectonics of study area was determined using Advanced Spaceborne Thermal Emission and Reflection Radiometer(ASTER) Global Digital Elevation Model(GDEM) based on Geomorphic Indices(Stream Length Gradient index, Hypsometric integral, Asymmetry factor, Basin shape, Valley floor width to Valley height ratio, Mountain front sinuosity index) cumulatively with Linear, Areal and Relief morphometric parameters on 27 delineated basins of the study area. The combined classification of Relative Tectonic Activity Index(Iat) and morphometric parameters of 27 basins categorized all the zones into four different classes:Class 1 – Very High(<1.97;410 km^2);Class 2 – High(1.97 – 2.05;275 km^2);Class 3 – Moderate(2.05 – 2.21;273 km^2),and Class 4 – Low(>2.21;299 km^2). The basins with tectonic activities have a consistent relationship with structural disturbances, basin geometry, and field studies. The tectonically active zonation of a part of Ganga basin using geomorphic indices and morphometric parameters suggest that it has significant influence of neotectonic activities in a part of Ganga basin.
基金provided by the State Key Research Development Program of China (No.2016YFC0801403)Key Research Development Program of Jiangsu Provence (No.BE2015040)+1 种基金National Natural Science Foundation of China (Nos.51674253,51734009 and 51604270)Natural Science Foundation of Jiangsu Province (No.BK20171191)
文摘Rock bursts have become one of the most severe risks in underground coal mining and its early warning is an important component in the safety management. Microseismic(MS) monitoring is considered potentially as a powerful tool for the early warning of rock burst. In this study, an MS multi-parameter index system was established and the critical values of each index were estimated based on the normalized multi-information warning model of coal-rock dynamic failure. This index system includes bursting strain energy(BSE) index, time-space-magnitude independent information(TSMII) indices and timespace-magnitude compound information(TSMCI) indices. On the basis of this multi-parameter index system, a comprehensive analysis was conducted via introducing the R-value scoring method to calculate the weights of each index. To calibrate the multi-parameter index system and the associated comprehensive analysis, the weights of each index were first confirmed using historical MS data occurred in LW402102 of Hujiahe Coal Mine(China) over a period of four months. This calibrated comprehensive analysis of MS multi-parameter index system was then applied to pre-warn the occurrence of a subsequent rock burst incident in LW 402103. The results demonstrate that this multi-parameter index system combined with the comprehensive analysis are capable of quantitatively pre-warning rock burst risk.
文摘Drought and salinity are the most widespread soil problems, posing a big threat to food security in rice growing regions. The present study evaluated the performance of eleven rice genotypes using morphological and physiological parameters, under induced drought and salinity conditions. The seedlings were raised in 5 kg of homogenous soil in plastic bags in the </span><span style="font-family:Verdana;">greenhouse</span><span style="font-family:""><span style="font-family:Verdana;">. For the drought experiment, each bag was watered with 200 ml of water twice daily until plants reached the five-leaf stage when watering was suspended for 2 weeks for the drought stressed plants but not suspended for the control plants. The experiment was a 2 × 11 factorial and the set up was arranged using the completely randomized design with three replications. Data were taken on Plant height, Number of tillers, leaf length, Number of green leaves, Number of dead leaves, Leaf rolling score (LRS) and Rate of water loss. The salinity experiment was set up in a similar manner except that the plants were irrigated twice a day for 2 weeks with 200 ml of treatment solution containing either 0 mM NaCl or 75 mM and data were collected on plant height, number of tillers, shoot fresh weight, shoot dry weight, Na</span><sup><span style="font-family:Verdana;">+</span></sup><span style="font-family:Verdana;"> and K</span><sup><span style="font-family:Verdana;">+</span></sup><span style="font-family:Verdana;"> concentrations, relative water content and chlorophyll content. Data from both experiments were subjected to Analysis of variance test using the GenStat software 10</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;"> edition and the means separated using least significant difference test. Individual stress response index (ISRI) was calculated for each parameter and the means used in grouping the varieties. Of the genotypes evaluated, four (FARO 44, NERICA 2, NERICA 8 and NERICA 5) were identified as tolerant, two (NERICA 4 and FARO 57) as moderately tolerant, while the rest were found to be sensitive to drought. Equally, two varieties (FARO 44 and RAM 137) stood out in the salinity screening as tolerant varieties, five were moderately tolerant while four (FARO 64, FARO 52, NERICA 2 and FARO 55) were clearly susceptible. FARO 44 is the only genotype that </span><span style="font-family:Verdana;">showed </span></span><span style="font-family:Verdana;">tolerance</span><span style="font-family:""> </span><span style="font-family:Verdana;">to both drought and salinity. The identified drought and salinity tolerant rice genotypes from this study can be recommended as genetic sources for future breeding programs for drought and salinity </span><span style="font-family:Verdana;">tolerance</span><span style="font-family:""> </span><span style="font-family:Verdana;">in rice.
基金supported by the National Natural Science Foundation of China(61807016 61174021)+3 种基金the Fundamental Research Funds for the Central Universities(JUSRP115A28 JUSRP51733B)the 111 Projeet(B12018)the Postgraduate Innovation Project of Jiangsu Province(KYLX151170)
文摘The control problem of a class of parabolic distributed parameter systems (DPSs) is investigated by using mobile agents with capabilities of sensing and actuating. The guidance strategies of mobile agents based on coverage optimization methods are proposed to improve the control performance of the system and make the state norm of the system converge to zero faster. The coverage optimization problems are constructed based on the measurement of each agent. By solving the coverage optimization problems, the local optimal moving direction of each agent can be obtained. Then the gradient-based agent motion control laws are established. With the indicator function and the surface delta function, this method is generalized to n-dimensional space, and suitable for any sensing region with piecewise smooth boundaries. The stability and control performance of the system are analyzed. Numerical simulations show the effectiveness of the proposed methods.
文摘With 178 West African Dwarf sheep aged 1 to 3 years, a study was conducted to investigate the effects of coat colour genes on body measurements, heat tolerance traits and haematological parameters. Body measurements considered included body length, hair length, ear length, hip width, tail length, height at withers, rump height, fore cannon bone length, chest depth, heart girth and body weight. Heat tolerance traits considered were skin temperature, rectal temperature, pulse rate and respiratory rate. Blood samples were collected for the evaluation of white blood cell (WBC), red blood cell (RBC), haemoglobin (HGB), haematocrit (HCT), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin cell (MCHC), red cell distribution width (RDW), platelets (PLT), mean platelets volume (MPV), platelets distribution width (PDW) and plateletcrits (PCT). Results showed that coat colour gene (CCG) had significant (P < 0.01) effect on rump height and tail length. Animals with black (BB) coat colour had the highest mean value for rump height (57.80 ± 1.29 cm) and tail length (22.10 ± 0.89 cm), while brown (Bb) coat colour had the least value of 53.00 ± 6.00 cm for rump height and 17.50 ± 0.50 cm for tail length. The CCG had significant (P < 0.01) effect on body temperature and pulse rate, with the grey/mouflon (Ag) colour possessing the highest body temperature (38.90°C ± 0.22°C), and Bb having the least value of 37.20°C ± 0.35°C. White/tan (Awt) had the highest pulse rate of 28.90 ± 0.66 beats/min and Bb had the least value of 20.00 ± 2.00 beats/min. The CCG had significant (P < 0.01) effect on RBC and MPV with brown (Bb) colour having the highest RBC counts (18.20 ± 0.00 L) and badgerface (Ab) having the least value (11.50 ± 0.62 L). The Bb had the highest value (5.60 ± 0.00 fL) for MPV and Ab had the least value (4.70 ± 0.15 fL). Sheep with Bb and Ab were found to withstand heat stress better than others.
文摘The aim of this study was to evaluate the effects of thermooxidation of S. ochocoa oil on its quality and on the biochemical and anthropometric parameters of Wistar rats. S. ochocoa seeds from the Lekoumou department were used for oil extraction at the press. The parameters measured were oil content and chemical indices, determined for samples of oil unheated and heated to 220˚C as a function of the number of heatings and the environment (open air, freezer). Two diets were created: the control diet and the treated diet, in which 10% oil was substituted for the control diet. These diets were fed to the rats for 28 days. Biochemical, anthropometric and atherogenicity parameters were measured. The results show that S. ochocoa oil has a saturated character and a blackish color, and it solidifies or coagulates rapidly. Unheated oil samples placed in a freezer and unheated samples placed in a simple freezer have relatively lower acid values (0.860 and 0.703 mg KOH/g respectively) than other samples. Acid index values for heated samples increase progressively with the number of heatings (1.063 ± 0.005 for 1st heating, 1.290 ± 0.010 for 2nd heating and 1.890 ± 0.006 for 3rd heating). The oil’s peroxide value increased with temperature and oxidation (65.6 ± 0.03 for unheated oil vs. 97.9 ± 003 for oil heated to 220˚C). The diet supplemented with this oil resulted in a significant increase in plasma cholesterol levels, and a significant decrease in triglyceride levels. The plasma atherogenicity index reveals the risk of cardiovascular disease associated with this food.
文摘Objective: to analyze the results and application value of erythrocyte parameters in blood test in the differential diagnosis of anemia. Methods: 138 cases of anemia patients admitted to our hospital in May 2020 (01-30) were taken as the research object, and set as the observation group. A total of 138 healthy subjects who underwent physical examination in our hospital during the same period were selected as the reference group. In the blood test of all subjects, the red blood cell analyzer is used to measure and record the parameters. Results: after examination, 138 cases of anemia in the observation group were identified as iron deficiency anemia, hemolytic anemia, megaloblastic anemia, aplastic anemia, liver and kidney disease and blood loss. There was significant difference between the observation group and the control group in the RBC parameters of the two groups (P < 0.05). Among them, Hb and RBC of hemolytic anemia and megaloblastic anemia patients were lower than those of the control group, while MCV, RDW and MCH were higher than those of the control group (P < 0.05). Compared with the reference group, the Hb and RBC of other anemia patients were lower (P < 0.05). Conclusion: the blood test for anemia patients can determine the parameters of red blood cells, and identify the type of anemia according to the level of each index, which provides reliable basis for the formulation of treatment plan and has strong possibility of popularization.
基金co-supported by the National Key Research and Development Program of China(2022YFF0800800)the National Natural Science Foundation of China(41988101-01,42130205)the Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0707)。
文摘The utilization of palynological data for plant diversity reconstructions offers notable advantages in addressing the discontinuity of plant fossils in the stratigraphic record. However, additional studies of modern processes are required to validate or refine the accuracy of diversity results obtained from palynological data. In this study, we used a modern pollen dataset of China to compare the accuracy of plant diversity reconstructions using five different palynological diversity indices(i.e., the pollen species number, Berger-Parker index, Simpson diversity index, Hill index, and Shannon-Wiener index) over a large spatial scale. We then identified climate factors that are most strongly correlated with these patterns of plant diversity. We found that the index that most accurately reflects plant diversity is the Shannon-Wiener index. Our analyses indicated that the most effective indices at reflecting plant diversity are the Shannon-Wiener index and Berger-Parker index. Numerical analysis revealed that palynological diversity(measured using the Shannon-Wiener index) was strongly correlated with climatic parameters, in particular average temperature in the coldest month and annual precipitation,suggesting these factors may be primary determinants of plant diversity distribution. We also found that a threshold value of the normalized Shannon-Wiener index(NH = 0.4) approximately aligns with the contour line specifying 400 mm annual precipitation, serving as a rudimentary indicator for assessing plant diversity in arid versus humid climates. This study suggests that pollen diversity indices have remarkable potential for quantitatively reconstructing paleoclimatic parameters.
文摘Objective:To investigate the loxic implications of ethanolic stem bark extract of Azadirachta indica(A-indica)at 50,100,200 and 300 mg/kg body weight in Wistar rats.Methods:Fifty male rats of Wistar strains were randomly grouped into five(A-F.)of ten animals each.Animals in Group A(control)were orally administered 1 mL of distilled water on daily basis for 21 days while those in Groups B-E received same volume of the extract corresponding to 50,100,200 and 300mg/kg body weight.Results:The extract did not significantly(P>0.05)alter the levels of albumin,total protein,red blood cells and factors relating to it whereas the white blood cell,platelets,serum triacylglycerol and high-density lipoprotein cholesterol decreased significantly(P<0.05).In contrast,the final body weights,absolute weights of the liver,kidney,lungs and heart as well as their organ-body weight ratios,serum globulins,total and conjugated bilirubin,serum cholesterol,low-density lipoprotein cholesterol and computed atherogenic index increased significantly.The spleen-body weight ratio,alkaline phosphatase,alanine and aspartate transaminases,sodium,potassium,calcium,feed and water intake were altered at specific doses.Conclusions:Overall,the alterations in the biochemical parameters of toxicity have consequential effects on the normal functioning of the organs of the animals.Therefore,the ethanolic extract of A.indica stem bark at the doses of 50,100,200 and 300 mg/kg body weight may not be completely safe as an oral remedy and should be taken with caution if absolutely necessary.
基金supported by the West Light Foundation of Chinese Academy of Sciences (XBBS200902)the Knowledge Innovation Project of Chinese Academy of Sciences(KZCX2-YW-BR-12)+2 种基金the National Natural Science Foundation of China (41104130)the West Light Foundation of Chinese Academy of Sciences (XBBS201006)the China Postdoctoral Science Foundation (20100471681)
文摘Drought is one of the major environmental threats in the world. In recent years, the damage from droughts to the environment and economies of some countries has been extensive, and drought monitoring has caused widespread concerns. Remote sensing has a proven ability to provide spatial and temporal measurements of surface properties, and it offers an opportunity for the quantitative assessment of drought indicators such as the vegetation water content at different levels. In this study, sites of cotton field in Shihezi, Xinjiang, Northwest China were sampled. Four classical water content parameters, namely the leaf equivalent water thickness （EWT^e,f）, the fuel moisture content （FMC）, the canopy equivalent water thickness （EVVmcanopy） and vegetation water content （VWC） were evaluated against seven widely-used water-related vegetation indices, namely the NDII （normalized difference infrared index）, NDWI2130 （normalized difference water index）, NDVI （normalized difference vegetation index）, MSI （moisture stress index）, SRWI （simple ratio water index）, NOWI1240 （normalized difference water index） and WI （water index）, respectively. The results proved that the relationships between the water-related vegetation indices and EWTleaf were much better than that with FMC, and the relationships between vegetation indices and EWTcanopy were better than that with VWC. Furthermore, comparing the significance of all seven water-related vegetation in- dices, WI and NDII proved to be the best candidates for EWT detecting at leaf and canopy levels, with R2 of 0.262 and 0.306 for EWTlear-WI and EWTcanopy-NDII linear models, respectively. Besides, the prediction power of linear regression technique （LR） and artificial neural network （ANN） were compared using calibration and validation dataset, respectively. The results indicated that the performance of ANN as a predictive tool for water status meas- uring was as good as LR. The study should further our understanding of the relationships between water-related vegetation indices and water parameters.
文摘Water quality indices (WQI) are useful tools for indicating the suitability of water for an expected use. However, they can suffer from some problems. The objective of this paper was to analyze the development of WQI to determine which parameters are used in water quality assessment and to discuss the characteristics of WQI. To screen articles on WQI, the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) method is applied to include or exclude articles. Four necessary steps are needed to design WQI: parameter selection, standardization, weighting and aggregation. A set of six methods of aggregations of sub-indices are identified: the arithmetic mean, the geometric mean, the root square, the logarithmic function, the fuzzy inference and the minimum operator. The problems encountered for the overall index are different according to the form of aggregation. They are eclipsing, ambiguity, rigidity or flexibility, adaptability and compensation. The chemical parameters (70%) are the most used in the development of WQI with the physical parameters used at 24% and the biological parameters at 6%. Dissolved oxygen (DO, 87%), total coliforms (87%), biological oxygen demand (BOD, 73%), pH (73%), temperature (67%), turbidity (60%), ammonia (53%), ammonium (47%) and total dissolved solids (47%) are the most commonly used parameters for water quality assessment.
基金the National Natural Science Foundation of China(No.51705445)General Project of Natural Science Foundation of Hebei Province(No.E2016203324)Youth Fund Project of Scientific Research Project of Hebei University(No.QN202013).
文摘The mathematical model of single degree of freedom(DOF)nonlinear autonomous bearing system under constant flow supporting model is deduced.The single DOF nonlinear autonomous bearing system is transformed with the method of linear and nonlinear treatment,the mathematical expression and parameters sensitivity of relative error of stiffness and damping are presented.Finally,the main factors of magnetic-liquid double suspension bearing(MLDSB)are analyzed,and the influence on bearing performance indicators of single DOF nonlinear autonomous bearing system of main factors is revealed.The results show that linear stiffness/damping is the first part of equivalent stiffness/damping,and the second and third parts are high order minor term of Tayor series transform.The film thickness,the magnetic-liquid proportionality coefficient,the mass of rotor are the major influence factor of the bearing performance.The research can provide the theoretical reference for the design and nonlinear analysis of MLDSB.
