Wyniki wyszukiwania

1

Identification algorithm of uncertain sonar signals in complex marine environment

100%

Zhang X.

Polish Maritime Research

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2017

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tom 24

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nr Special Issue S3

The current identification algorithm using sonar signal parameters of bandwidth, frequency, duration and pulse waveform which are easy to detect and imitation, to identify the identity of sonar signal, resulting in part of the sonar signal identity is not easy to distinguish. Therefore, an algorithm based on signal feature extraction and digital watermarking is proposed to recognize the uncertain sonar signals. The algorithm embeds the digital watermark into the detection signal from the uncertain sonar. The identity of the signal is recognized by detecting whether the received signal contains watermarks. Experimental results showed that the proposed algorithm can effectively improve the recognition performance of sonar signal source

2

CO2 emissions in China’s Yangtze River Economic Zone: a dynamic vector autoregression approach

64%

Wen L., Zhang X.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 2

China has become the world’s largest carbon emitter, and coal consumption in the Yangtze River Economic Zone takes over more than one third of the total number in the country. Investigating the main influencing factors of the Yangtze River Economic Zone’s CO₂ emissions is of vital importance to develop effective environmental policies. The vector autoregression model was applied in the present paper to analyze the driving forces in this area based on the pertinent data from 1985 to 2014. Results show that energy efficiency is the primary influencing factor of the region’s carbon emissions, which plays a leading role in mitigating CO₂ emissions. Energy structure has an obviously positive impact on the zone’s CO₂ emissions. Urbanization has continuously promoted coal consumption in this area. These findings are extremely helpful for related departments in the Yangtze River Economic Zone to develop appropriate policies pertaining to energy savings and emissions reduction.

3

The genomic survey of Tc1-like elements in the silkworm microsporidia Nosema bombycis

63%

Song H., Tang X., Lan L., Zhang X., Zhang X.

Acta Parasitologica

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2020

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tom 65

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nr 1

4

Evidence for two peptidergic, analgesic defensesystems at the spinal level

51%

Hokfelt T., Zhang X., Ru-Rong J., Wiesenfeld-Hallin Z.

Acta Neurobiologiae Experimentalis

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1995

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tom 55

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nr 5

5

Ethanol content in plants of Brassica napus L. correlated with waterlogging tolerance index and regulated by lactate dehydrogenase and citrate synthase

51%

Xu B., Cheng Y., Zou X., Zhang X.

Acta Physiologiae Plantarum

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2016

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tom 38

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nr 03

6

Pyramiding Bt genes for increasing resistance of cotton to two major lepidopteran pests: Spodoptera litura and Heliothis armigera

51%

Li L., Zhu Y., Jin S., Zhang X.

Acta Physiologiae Plantarum

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2014

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tom 36

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nr 10

To more effectively control two major cotton insects (cotton bollworm and Spodoptera litura) and improve the efficacy of the pest resistance management, novel transgenic plants expressing Bacillus thuringiensis Cry9C gene were generated, and gene stacking strategy was incorporated. Initially, a binary plasmid vector harboring Cry9C gene was introduced into an elite cotton cultivar Simian-3 by Agrobacterium-mediated transformation. Integration and expression of the Cry9C genes in three transgenic lines were confirmed by PCR and RT-PCR. Among these transgenic lines, T0 generation of line 16 (L-16) with normal phenotypes were selected by ELISA assays for its highest expression level of Cry9C. In T1 population of L-16, the expression level of Cry9C ranged from 29 to 45 lg/g fresh leaf. The following insect bioassays demonstrated that transgenic S3-35S::Cry9C cotton plants exhibited moderate toxicity to Heliothis armigera but strong toxicity to S. litura compared with the transgenic plants expressing Cry 1Ac gene. For incorporation of gene staking strategy, Cry9C gene and Cry 2A or Cry 1Ac were pyramided, respectively by sexual crossing. The expression of Cry9C protein in all F1 progenies had a similar level as the parent plants indicating the high heritability of Bt genes in transgenic progenies. Progenies from both Cry9C × Cry 2A and Cry9C × Cry 1Ac exhibited higher resistance to S. litura compared with their parents. Together our data demonstrated that our newly generated transgenic plants represent a reservoir of novel insect-resistant materials in cotton breeding, and the successful incorporation of gene pyramiding technology can provide a new solution of developing multiple resistance management strategies.

7

Maintenance grouping optimization for offshore wind turbine considering opportunities based on rolling horizon approach

51%

Lua Y., Suna L., Kanga J., Zhang X.

Polish Maritime Research

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2018

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tom 25

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nr 2

In future, offshore wind turbines may be consider a crucial part in the supply of energy. Maintenance processes are directed to attain a safe and reliable operation of offshore machines and wind turbines. In this paper, an opportunistic maintenance strategy for offshore wind turbine is proposed, considering imperfect maintenance and the preventive maintenance durations. Reliability Centric Maintenance serves as a proactive tactic to operations and maintenance by inhibiting the possible reasons of poor performance and controlling failures. Other components can implement the opportunistic preventive maintenances if one component has reached its reliability threshold. According to the rolling horizon approach, it is of great importance to update the maintenance planning for the sake of the short-term information. By figuring out the best combination, the maintenance schedule in the mission time has been finally determined. Failure information are obtained from previous studies to accomplish the calculations. The outcomes indicate that the maintenance cost has been dramatically reduced through the application of opportunistic maintenance

8

Effects of repeated lipopolysaccharide treatment on growth performance, immune organ index, and blood parameters of Sprague-Dawley rats

51%

Zhong Y., Zhang X., Hu X., Li Y.

Journal of Veterinary Research

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2018

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tom 62

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nr 3

9

Provincial differences on CO2 emissions in China’s power industry: a quantile regression approach

51%

Wen L., Zhang X., Zhang Z., Shao H.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 5

As the world’s largest energy consumer today, China is causing increasing pressure on the global environment, and the power industry might bear the primary responsibility for producing nearly 50% of China’s CO₂ emissions. Investigating the main drivers of CO₂ emissions in China’s power industry is of vital importance for developing effective environmental policies. Based on the panel data of 30 provinces in China, the quantile regression approach was applied in the present paper in order to find out which provinces should pay more attention to mitigating CO₂ emissions in the power industry. Results show that the upper 90th quantile provinces (Guangdong, Jiangsu and Shandong) have to spend more efforts on carbon reduction, and the influences of economic growth, industrialization level and energy efficiency in these provinces are more significant than in others. These findings are extremely helpful for related departments in the power industry to develop appropriate policies pertaining to energy savings and emissions reduction.

10

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Thermal conductivity of a Brown Earth soil as affected by biochars derived at different temperatures: Experiment and prediction with the Campbell model

51%

Zhao B., Li L., Zhao Y., Zhang X.

International Agrophysics

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2020

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tom 34

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nr 4

11

Analysis of the influence mechanism of energy-related carbon emissions with a novel hybrid support vector machine algorithm in Hebei, China

51%

Wang J., Yang F., Zhang X.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 5

The Beijing-Tianjin-Hebei Region (BTH) as a national strategic highland attracts attention with its haze problem. In particular, Hebei is a major emitter of carbon emissions in BTH. The establishment of the Xiong’an New District in Hebei, known as the “Millennium plan,” faces complex and diverse development in the future, so the carbon emission prediction and influence mechanism are of great significance. This paper has made two improvements to the particle swarm optimization algorithm (PSO), then the improved algorithm is used to optimize parameters of the traditional support vector machine (SVM). Therefore, a new model, IPSO-SVM, is established. This paper uses the STIRPAT model to determine the impact factors, through 64 predict scenarios of 2017-2020 to reveal that economic growth is the most important factor of carbon emissions in Hebei, followed by resident population, industrial structure, urbanization level, energy structure, and technical level. In the case of positive economic development, the contribution of technology to carbon reduction will increase. Based on the “new normal,” Hebei ought to develop sustainable urbanization and emphasis on the role of technology in low-carbon development to control carbon emissions.

12

Establishment of transgenic marigold using the floral dip method

51%

Cheng X., Huang C., Zhang X., Lyu Y.

Acta Physiologiae Plantarum

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2019

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tom 41

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nr 08

The floral dip transformation method avoids tissue culture and regeneration processes of marigold, and the green fluorescent protein (GFP) is widely used in the detection of genetically modified organisms. In our study, the binary vector PCB260 containing the screening gene basta, the reporter gene GFP, and a 4 × 35S enhancer was transferred into marigold (Tagetes erecta) via Agrobacterium tumefaciens EHA105-mediated transformation using the floral dip method. After herbicide-resistance screening and genomic PCR testing, four transgenic lines were obtained in T₀ generation. In the T₁ generation, 15 transgenic plants showed fluorescence and were GFP-positive with phenotypic changes. The segregation ratio of mutant to normal plants was 1:3. Plant height, leaf length and width were significantly greater in the normal plants than in the mutant plants. Mutant plants did not bloom.

13

Transcriptional profiles during the differentiation and maturation of monocyte-derived dendritic cells, analyzed using focused microarrays

51%

Zhong W., Fei M., Zhu Y., Zhang X.

Cellular and Molecular Biology Letters

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2009

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tom 14

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nr 4

587-608

Dendritic cells (DC) are professional antigen-presenting cells capable of initiating primary immune responses. They have been intensively studied and are used in both basic immunology research and clinical immunotherapy. However, the genetic pathways leading to DC differentiation and maturation remain poorly understood. Using focused microarrays with oligonucletotide probes for 120 genes encoding co-stimulatory molecules, chemokines, chemokine receptors, cytokines, cytokine receptors, TLRs, and several other related molecules, we analyzed the kinetics of gene expression for the overall differentiation process of monocytes into mature DC. In parallel, we compared the transcriptional profiles in DC maturation in the presence of LPS, TNF-α or trimeric CD40L. We found similar transcriptional profiles for early immature DC and immature DC, respectively generated by culturing monocytes with GM-CSF and IL-4 for three or six days. We identified sets of common and stimuli-specific genes, the expression of which changed following stimulation with LPS, TNF-α or CD40L. A dynamic analysis of the entire DC differentiation and maturation process showed that some important inflammatory and constitutive chemokines are transcribed in both immature and mature DC. The correlative expression kinetics of the gene pairs IL1R1/IL1R2, IL15/IL15RA, DC-SIGN/ICAM-2 and DC-SIGN/ICAM-3 imply that they all play crucial roles in mediating DC functions. Thus, our analysis with focused microarrays shed light on the transcriptional kinetics of DC differentiation and maturation, and this method may also prove useful for identifying novel marker genes involved in DC functions.

14

Antibiotic resistance and molecular characteristics of Staphylococcus aureus isolated from pigs in Hunan, China

51%

Zhang X., Wang G., Yin C.

Polish Journal of Veterinary Sciences

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2020

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tom 23

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nr 4

15

Screening for cold-resistant tomato under radiation mutagenesis and observation of the submicroscopic structure

51%

Wang S., Yang R., Shu C., Zhang X.

Acta Physiologiae Plantarum

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2016

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tom 38

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nr 11

16

Comparison of spatial interpolation methods based on rain gauges for annual precipitation on the Tibetan Plateau

51%

Zhang X., Lu X., Wang X.

Polish Journal of Environmental Studies

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2016

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tom 25

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nr 3

Accurate precipitation data are of great importance for environmental applications. Interpolation methods are usually applied to afford spatially distributed precipitation data. However, due to the scarcity of rain gauges, different spatial interpolation methods may result in deviations from the real spatial distribution of precipitation. In this study, three different interpolation methods were investigated with regard to their suitability for producing a spatial precipitation distribution on China’s Tibetan Plateau. Precipitation data from 39 rain gauges were spatially interpolated using ordinary kriging, cokriging with covariates as elevation (Cok-elevation), and cokriging with covariates as tropical rainfall measuring mission (Cok-TRMM). The results showed that the mean absolute error (MAE), mean relative error (MRE), and root mean square error (RMSE) for Cok-TRMM amounted to 103.85 mm, 0.32, and 134.50 mm, respectively. These numbers were lower than the figures for ordinary kriging (MAE 111.01 mm, MRE 0.34, RMSE 144.86 mm) and Cok-elevation (MAE 111.43 mm, MRE 0.34, RMSE 144.35 mm). In addition, the correlation coeffi cient between observed and predicted values of Cok-TRMM (r² = 0.53) was higher than that for ordinary kriging (r² = 0.46) and Cok-elevation (r² = 0.46). Our results demonstrate that Cok-TRMM is more effective at producing a spatial precipitation distribution on the Tibetan Plateau and can serve as a new spatial interpolation method for precipitation in data-scarce regions.

17

Soil aggregate response to three Freeze-thaw methods in a Northeastern China Mollisol

51%

Chen S., Burras C. L., Zhang X.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 5

Freeze-thaw (FT) cycles occur annually in soils of mesic and frigid temperature regimes. FT has profound impacts on soil aggregates yet is often difficult to document in field settings. As a result, laboratory-based FT experiments are widely used, albeit with their own limitations. Both laboratory and field-based research indicates that aggregate properties vary with rates of freezing and thawing as well as the number and amplitudes of FT cycles. In this study, we introduce a continuous freezing-to-thawing-to-freezing technique (i.e., “VTR”) and compare it to a commonly used discrete freeze-then-thaw-then-freeze method (i.e., “RTCR”) and compare both results to natural seasonal changes. Our study soil is the A horizon of the major cropped mollisol in northeastern China. We examined it under natural field soil moisture conditions as well as two controlled soil moisture contents in the laboratory. Both RTCR and VTR show a decrease in large (>1mm) aggregate content and a corresponding increase in medium (0.5 to 0.2 mm) aggregates (P>0.05) that is proportional to the number of FT cycles and soil moisture content. Wet aggregate stability (WAS) increased (P<0.05) over the time of the experiment with each method. RTCR data showed an interaction between FT cycles and soil water content. VTR was better, although certainly not with better matched field results than RTCR, which we attribute its FT cycles being matched to anactual field. These results confirm the dependability and authenticity of the VTR technique.

18

Characterization of size distribution and concentration of atmospheric particles during summer in Zhuzhou, China

51%

Wang J., Zhang X., Zhang K., Zheng Z.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 6

In order to provide a sound basis for the performance evaluation of a local government’s air pollution prevention and abatement measures, the mass concentrations of PM2.5 and PM10 and the concentrations of different sized particles were measured in August 2013. Meanwhile, the influencing factors and sources of atmospheric particulate matters were analyzed by combining meteorological factors and gaseous pollutants. The results indicated that PM2.5 and PM10 in Zhuzhou were (30.3±12.2) μg·m⁻³ and (56.4±26.6) μg·m⁻³, respectively. The mean values of the particle number concentration in the size range of 0.5~1 μm and 1~2.5 μm on sunny days were (121.2±75.9) cm⁻³ and (6.8±3.7) cm⁻³, respectively, whereas in the rainy days they sharply increased to (868.7±262.1) cm⁻³ and (347.9±238.6) cm⁻³, which accounted for 71.0% and 28.4% of the total number of concentrations, respectively. Backward trajectory analysis demonstrated that the air masses in Zhuzhou city mainly came from three directions: southeast (52.2%), southwest (24.7%), and northeast (23.1%). Although accounting for a minor fraction, the northeast air mass had the largest effect on particle concentrations in Zhuzhou and also carried a lot of gaseous primary pollutants.

19

Urbanization effect on energy - related carbon emissions in Jiangsu Province from the perspective of resident consumption

51%

Zhang X., Zhao Y., Xu X., Wang C.

Polish Journal of Environmental Studies

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2017

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tom 26

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nr 4

Controlling carbon emissions without impairing urbanization and economic development highlights the necessity of researching energy-related carbon emissions. Urban areas have become the main source of energy consumption and carbon emissions. This paper has developed a modified version of the Kaya identity, which incorporates urbanization and resident consumption, to analyze urbanization effect on carbon emissions in Jiangsu Province. Then, the Kuznets curve theory was introduced to estimate the inflection point of the marginal urbanization effect. The results indicated that the urbanization effect was still an important factor that influences total carbon emissions. The marginal urbanization effect will still increase until the urbanization rate reaches 78.94%. Therefore, Jiangsu should also pay attention to the urbanization effect even though it may increase slowly or decrease, and the results of this paper on marginal urbanization effect make it clear that controlling the carbon emissions without the expense of urbanization growth and economic development is still a big challenge for Jiangsu Province. We have proposed some policy recommendations, which include paying attention to the quality of development of urbanization, adjusting the industrial structure, making changes to lifestyles, and so on.

20

Insecticide susceptibility of the green plant bug, Apolygus lucorum Meyer-Dur (Homoptera: Miridae) and two predatory arthropods

51%

Zhang Z., Zhang X., Liu F., Mu W.

Journal of Plant Protection Research

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2015

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tom 55

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nr 4

The green plant bug (Apolygus lucorum Meyer-Dür) is a key pest of Bt cotton in China. Along with biological control, chemical control is one of the most important strategies in A. lucorum Integrated Pest Management (IPM). The goal of this study was to evaluate the toxicity of eight conventional insecticides to A. lucorum and to assess the susceptibility of two generalist predators Chrysopa sinica (Jieder) and Propylaea japonica (Thunbery) to insecticides that are commonly used in A. lucorum management. Via glass-vial and leaf-dip bioassay, toxicity tests with selected insecticides at two different life-stages of A. lucorum indicated significant differences between the LD50 or LC50 values for these compounds within different insecticidal classes. Phenylpyrazole fipronil had the highest toxicity to 4th-instar nymphs and adults of A. lucorum, whereas neonicotinoid imidacloprid had the lowest toxicity among the insecticides. Females were more tolerant to insecticides than were males, as shown by the higher LD50 values for females. Furthermore, laboratory tests showed that endosulfan had the highest selectivity to C. sinica and P. japonica: the selective toxicity ratios (STRs) were superior to other tested insecticides, particularly imidacloprid, and were 5.396 and 4.749-fold higher than baseline STRs, respectively. From this study, we conclude that fipronil can potentially be used to efficiently control A. lucorum. An alternative control agent worth consideration is endosulfan, owing to its relative safety to non-targeted natural enemies.

Ograniczanie wyników

Identification algorithm of uncertain sonar signals in complex marine environment

CO2 emissions in China’s Yangtze River Economic Zone: a dynamic vector autoregression approach

The genomic survey of Tc1-like elements in the silkworm microsporidia Nosema bombycis