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Regio- and Chemoselective Fluorination of 1,3-Dicarbonyl Compounds
[Abstract](698) [PDF 0KB](29)
Abstract:
Highly regioselective α-fluorination of 1,3-dicarbonyl compounds could proceed smoothly by virtue of 1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) as the fluorine source in the mixed solvent of ethanol and water. By adjusting the amount of the fluorine source and reaction time, the desired 2-fluoro- and 2,2-difluoro-1,3-dicarbonyl compounds could also be efficiently constructed with an excellent chemoselectivity. The reaction readily took place via a single electron transfer process at room temperature without any transition-metal catalyst, alkaline additive or additional oxidant and could be applicated in gram-scale synthesis, which features a convenient and practical free-radical fluorination.

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Dynamic Analysis of Filippov Model for a Kind of Nutrition-Phytoplankton Based on Ecological Water Diversion
GUO Hongjian, ZHU Congcong
2019, 32(4): 517-524.   doi: 10.3969/j.issn.1003-0972.2019.04.001
[Abstract](72) [PDF 1050KB](4)
Abstract:
Based on the practical background that ecological water diversion can improve water environment, a Filippov dynamic model of nutrient phytoplankton is constructed. Firstly, the qualitative properties and stability of the subsystems are studied. It is pointed out that the subsystems may have a globally stable positive equilibrium point, respectively. Secondly, the sliding mode dynamics of the Filippov system, including the existence and stability of the real equilibrium point, the virtual equilibrium point, the pseudo equilibrium point and the tangent point, are discussed. Finally, the sliding bifurcations related to the boundary equilibrium point are given by theoretical analysis and numerical simulation, and the corresponding biological significance is given.
Existence,Uniqueness and Ultimate Boundedness of Positive Solution to a Stochastic Barbour Single-host Model
QI Longxing, LIU Binbin, TANG Yanwu
2019, 32(4): 525-530.   doi: 10.3969/j.issn.1003-0972.2019.04.002
[Abstract](66) [PDF 379KB](2)
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Considering the random factors involved in the transmission of schistosomiasis, the random terms were introduced inti the classic Barbour single-host model and a random model of schistosomiasis is formulated. By constructing the Lyapunov function and using the Itô integral, it is proved that the positive solution is unique and ultimately bounded.
Z3-connectivity of Graphs with Independence Number 2
ZHANG Xiaoxia, YU Kun
2019, 32(4): 531-533.   doi: 10.3969/j.issn.1003-0972.2019.04.003
[Abstract](67) [PDF 293KB](2)
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Let G be a connected simple graph with independence number 2. It is proved that:(i) if G is 4-edge connected, then G is Z3-connected; (ii) if G is 3-connected, then G is Z3-connected if and only if G∉{K4,W5}and G is not a special type of graph.
2D Acoustic Analysis Based on Exact Geometric Boundary Element Method
ZHANG Wei, WANG Shige, LU Chuang
2019, 32(4): 534-538.   doi: 10.3969/j.issn.1003-0972.2019.04.004
[Abstract](65) [PDF 987KB](2)
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Based on the theory of exact geometric analysis, the real geometric boundaries are considered, the error created by meshing is decreased, and a new boundary integral equation is introduced. The method of Cauchy principle value integrals and Hadamard finite-part integral are used to solve the problem of singular term integrals. Besides, non-unique solution caused by fictitious frequency is circumvented through the Burton-Miller method. Numerical examples show that the method considering the exact geometric boundary has a good accuracy.
Development and Application of Specific Molecular Markers for the hau CMS in Chinese Cabbage
HENG Shuangping, HUANG Hao, YANG Xi, CHEN Guo, ZHOU Yiwen, WANG Yinle, LI Xianwen
2019, 32(4): 539-543.   doi: 10.3969/j.issn.1003-0972.2019.04.005
[Abstract](58) [PDF 731KB](2)
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Chinese cabbage and leaf mustard were used as basic materials.The mitochondrial genome of hau CMS cytoplasm was compared with the mitochondrial genome of the other cytoplasmic male sterile line used in Brassica, after bioinformatics analysis, the DNA sequence specific to the hau CMS mitochondrial genomes were selected. Based on the sequence information, a hau CMS-specific molecular marker was developed to identify the hau CMS type cabbage. Meanwhile, the hau CMS deleted mitochondrial genome sequence but shared by other cytoplasms was found. Based on this sequence information, a hau CMS-Deletion molecular marker was developed. And the two pairs of markers were successfully verified by using DNA from different cytoplasmic materials such as hau CMS, ogu CMS, pol CMS, oxa CMS, orf220 CMS.
Allelopathic Effect of Invasive Plant Bidens frondosa on Two Crops
LU Dongsheng, WU Hao, CHEN Junfan, SHI Lishun
2019, 32(4): 544-548.   doi: 10.3969/j.issn.1003-0972.2019.04.006
[Abstract](63) [PDF 394KB](2)
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Using water extraction method to extract the allelopathic substances of invasive plant Bidens frondosa leaf and stem,by contrast test, the effects of different concentrations of aqueous extract of stem and leaf of Bidens frondos on seed germination and seedling growth of wheat and barley were studied.The results showed that the extract of Bidens frondos plants had significant inhibition on the germination of barley seeds, but not on the germination of wheat seeds.Except for 50 g/L extract,the other treatments significantly inhibited seedling height and root length of barley and wheat.The extracts could inhibit the differentiation of the roots of 2 crops.Among them, the inhibition on wheat root differentiation is relatively large.The synthetic allelopathic effect of Bidens frondosa extract on wheat and barley is inhibitory and the inhibition to barley is greater than that of wheat.
Growth Characteristics of Pseudogastromyzon (Labigastromyzon)Changtingensis Tungpeiensis Chen et Liang
LI Hongjing, LI Xiaofeng, CHEN Menhui
2019, 32(4): 549-556.   doi: 10.3969/j.issn.1003-0972.2019.04.007
[Abstract](58) [PDF 1053KB](1)
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The 157 Pseudogastromyzon (Labigastromyzon) changtingensis tungpeiensis Chen et Liang were sampled in the upper Beijiang river in May and September 2013, and their growth characteristics were analyzed. The results showed that there was a significant difference in the relationship between body length and body weight between the male and female samples (P<0.05). The relationship between female body length and body weight was W=0.029L2.820, which was allosteric growth. Male W=0.019L3.002 was uniform growth. There was a linear relationship between body length and scale, and female was y=0.232x+21.52, male was y=0.289x+19.28. Von Bertalanffy Growth equation female:Lt=72.52(1-e-0.15(t+2.70)),Wt=7.74(1-e-0.15(t+2.70))2.820,male was Lt=81.34(1-e-0.14(t+2.74)),Wt=10.26(1-e-0.14(t+2.74))3.002. The inflorescence age of the female was 4.21 and the male was 5.11 years. The body length and body weight at the inflection point were 46.80 mm and 2.25 g, 54.23 mm and 3.04 g respectively.
Estimation of Carbon Storage in Wetlands in Northeast China
XING Wei, LI Peipei, LIU Minghua, ZHANG Chenguang, LI Zongmeng, LI Xiumei
2019, 32(4): 557-562.   doi: 10.3969/j.issn.1003-0972.2019.04.008
[Abstract](64) [PDF 682KB](2)
Abstract:
To accurately estimate the carbon (C) storage of wetlands in Northeast China, A dataset of 134 peat dates were compiled from previously published literature, unpublished data sources, and our own new dating results across the northeast China. Based on the collection and self-testing of 134 wetland cores, and according to the second national wetland resources survey data, the C storage of wetlands were re-estimated in Northeast China. The results showed that the total wetlands area and C storage within this region is 82 870 km2 and 4.34 Gt, respectively, and about 80% of the C is contained in Mountain wetlands, such as Changbai mountains, Great Khingan mountains and Lesser Khingan mountains. The C density per unit area of wetlands in Northeast China is 12.49~95.64 kg·m-2, which range change relatively larger. The factors affecting the uncertainty of wetlands C storage are mainly the wetlands sediment depth, dry bulk density and organic carbon content. Strengthening the collection of these basic data will be more conducive to accurately estimate the C storage of wetlands in Northeast China.
Analysis on Evolution Characteristics of Wetland Landscape Ecological Patterns in Northwest Guizhou Plateau
REN Jintong, CHEN Fanmei, CHEN Qunli, FENG Tu, WANG Zhihong, ZUO Taian
2019, 32(4): 563-571.   doi: 10.3969/j.issn.1003-0972.2019.04.009
[Abstract](65) [PDF 798KB](1)
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Taking the plateau area of Northwest Guizhou in typical karst area as the research object, based on the landscape ecology theory, and three remote sensing images of 1995, 2005 and 2015 were selected,which the landscape pattern index was used to quantitatively analyze the dynamic changes of the plateau wetland landscape pattern in the past 20 years. The results showed that:(1) Great changes had taken place in wetland landscape types in northwestern Guizhou plateau, and the total area of wetland landscape types showed a downward trend. (2) Among the wetland landscape types in the study area, the area of wetland landscape types such as rivers, reservoirs, ponds and beaches decreased seriously, while the area of wetland landscape types such as paddy fields and lakes increased due to human activities and policies. (3) Except for beach landscape types, NP and PD of other wetland landscape types increased in varying degrees. The LPI of paddy field landscape types remained basically unchanged, while that of other wetland landscape types increased in varying degrees. According to the average patch area (AREA_MN), the change of river landscape type was the most serious. (4) In the past 20 years, the heterogeneity of wetland landscape in the study area had increased, and different landscape patches tended to be discrete in space. Among them, from 1995 to 2015, the landscape spread index (CONTAG) in the study area showed a downward trend, while SHDI and SHEI showed a continuous increasing trend.
Evaluation of Cultivated Land Intensive Use in Henan Province Based on the Competition-cooperation Law
FAN Hui
2019, 32(4): 572-578.   doi: 10.3969/j.issn.1003-0972.2019.04.010
[Abstract](59) [PDF 597KB](1)
Abstract:
By using the model of coordinated development degree and introducing multiple difference factor, the method of calculating the level of intensive utilization of cultivated land was improved. The internal coordination and intensive utilization degree of cultivated land in Henan Province were analyzed vertically and horizontally.The results show that the competition or cooperation relationship between the subsystem of cultivated land intensive use will lead to the reduction or enhancement of the intensive use levels of cultivated land. In the four subsystems of cultivated land intensive use, the subsystem of input intensity has been lower than the other three subsystems. Otherwise, it restricts the internal coordination degree of cultivated land intensive use and the overall level of intensive use of cultivated land.In the cross-sectional study of four years,there is no obvious spatial distribution of cultivated land intensive use in the 18 regions. During the research period, the intensive utilization of cultivated land in some areas has declined dramatically, which mainly are caused by the decline of subsystem score and the competition between the four subsystems.With the relative backwardness of agricultural income and the increase of rural migrant workers,local governments should actively introduce relevant policies to improve farmers' input intensity.
Study on Characteristics of Temperature Variation in Wuhan City for the Past 110 Years Based on Information Entropy
CHI Zhifeng, YAN Junhui, LIU Jinke, WU Lili
2019, 32(4): 579-583.   doi: 10.3969/j.issn.1003-0972.2019.04.011
[Abstract](60) [PDF 1033KB](1)
Abstract:
Based on the monthly temperature data of Wuhan City from 1906 to 2015, Shannon entropy, Renyi entropy and Tsallis entropy were used to analyze the variation characteristics of Wuhan city temperature at different time scales. The results show that:(1) the monthly mean temperature in February is the most stable and the variability is the smallest in Wuhan in past 110 years. The monthly average temperature in May is the most unstable and the variability is the biggest;(2) the seasonal mean temperature of Wuhan in the past 110 years in summer is the worst and the variability is the highest in the eight ages. The seasonal mean temperature in spring is the worst in the three ages, the variability is the biggest, the stability is the best in the five ages, and the variability is the smallest; (3) the annual mean temperature variability of Wuhan City from 1906 to 2015 is cyclical and the period of change is 30 years. It is predicted that the annual average temperature of Wuhan will stabilize in the next 10 years.
Comparative Analysis of 3 NDVI Remote Sensing Datastes in the Dabie Mountains
WU Lili, CHEN Yueqing, CHI Zhifeng, ZHOU Shitian, SUN Chunmeng, SHI Xinyu, HU Jing, LIU Junxiao, ZHANG Yibing
2019, 32(4): 584-589.   doi: 10.3969/j.issn.1003-0972.2019.04.012
[Abstract](60) [PDF 1285KB](1)
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The NDVI (normalized difference vegetation index)datasts of GIMMS, MODIS and SPOT/VEGETATION were selected as data sources to analyze their spatial distribution and timing changes in the Dabie Mountains. The results showed that:(1) these data had generally similar distribution patterns in space. MODIS and SPOT/VEGETATION NDVI matched well.MODIS had narrow band width, high spatial resolution and large variation range;(2)three types of NDVI changed seasonally similar to the same amplitude in terms of time series variation.MODIS NDVI and SPOT/VEGETATION NDVI clearly reflected the lag of the NDVI response to precipitation for about 1 month. GIMMS NDVI clearly and accurately reflected the changes of ground vegetation cover. The dynamic range of SPOT/VEGETATION was larger than that of GIMMS NDVI and MODIS NDVI.
Construction and Application of Performance Evaluation Model of Sponge City in Hebi City
ZHAI Huimin, CHENG Qixian, LI Jiahui, LI Shuqin, ZHANG Qian, ZHANG Xiangmin
2019, 32(4): 590-594.   doi: 10.3969/j.issn.1003-0972.2019.04.013
[Abstract](66) [PDF 495KB](1)
Abstract:
Taking the performance evaluation of sponge city as the research object, the performance evaluation model of sponge city was constructed. The weight is determined by analytical hierarchy process, and the performance evaluation model with matter-element method is applied. The construction of sponge city is empirically studied in Hebi City. The results show that the overall results of performance evaluation of Hebi Sponge City are excellent. On this basis, this work puts forward suggestions on performance evaluation and construction activities of sponge city.
Label-Free Electrochemiluminescence Immunosensor for Cardial Troponin I Detection Based on MoS2 Quantum Dots
WANG Hui, REN Xiuyan, LIU Furao, CAO Juntao, LIU Yanming
2019, 32(4): 595-599.   doi: 10.3969/j.issn.1003-0972.2019.04.014
[Abstract](79) [PDF 937KB](3)
Abstract:
A label-free electrochemiluminescence (ECL) immunosensor for sensitive detection of cardiac troponin I (cTnI) was constructed based on MoS2 quantum dots (MoS2 QDs)/potassium persulfate (K2S2O8) ECL system. The luminescent material MoS2 QDs was combined with reduced graphene oxide (MoS2 QDs-rGO) to construct the immunosensor. The large surface area of rGO could carry a large amount of MoS2 QDs. The MoS2 QDs-rGO exhibited good ECL performance. Under the optimized conditions, the proposed ECL immunosensing method showed good analytical performance for cTnI detection, and the linear range was 1.0×10-9~1.0×10-4 g/L (R=0.998) with a detection limit of 4.9×10-10 g/L (RSN=3). The proposed method was applied for the determination of cTnI in human serum samples, and the analytical results were consistent with the results of Xinyang Central Hospital. The recoveries of the method were 98.0%~110.0%.
Glutathione Stabilized Copper Nanoclusters Based Fluorescent Method for the Sensitive Detection of Hg2+ Ion
WANG Haibo, BAI Hongyu, MAO Anli, DONG Gaoli
2019, 32(4): 600-603.   doi: 10.3969/j.issn.1003-0972.2019.04.015
[Abstract](62) [PDF 1201KB](3)
Abstract:
Water-soluble and stable fluorescent Cu nanoclusters (CuNCs) were prepared by using glutathione (GSH) as protecting ligand and reducing agent.The obtained CuNCs emitted red fluorescence at 590 nm, with the quantum yield of 2.3% and good photo-stability. A fluorescence sensing method was reported for the sensitive determination of Hg2+ by using the GSH-stabilized CuNCs (GSH-CuNCs). The linear regions were obtained from 2.0×10-8 mol/L to 2.0×10-6 mol/L and with a limit of detection of 4.0×10-9 mol/L. The strategy was successfully applied for the determination of the Hg2+ levels in lake water samples. It could provide a novel method for the rapid and sensitive monitoring of Hg2+ ions.
Electrochemical Determination of Nitrofurazone by Electrochemical Sensor Base on Hollow ZnSn(OH)6/Ti3C2 MXene Nanocomposite
YAO Yaxian, XU Liping, ZHAO Mengyi, GAN Tian
2019, 32(4): 604-610.   doi: 10.3969/j.issn.1003-0972.2019.04.016
[Abstract](65) [PDF 1056KB](2)
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The ZnSn(OH)6 microspheres were prepared by one-step hydrothermal method, which were compounded with two-dimensional Ti3C2 MXene nanosheets to obtain ZnSn(OH)6/Ti3C2 MXene nanocomposite, and a novel electrochemical sensor was fabricated based on this material. The irreversible oxidation peak of nitrofurazone was firstly studied on this sensor by using cyclic voltammetry. The voltammetric process of nitrofurazone was adsorption-controlled and the electron transfer number of this oxidation reaction was 2. The differential pulse voltammetry was used for the quantitative analysis of nitrofurazone, and the results showed that this sensor had remarkable catalytic effect for the electrochemical oxidation of nitrofurazone owing to the synergistic effect of ZnSn(OH)6 microspheres and two-dimensional Ti3C2 MXene. The concentration of nitrofurazone had good linear relationship with its oxidation peak current in the range of 0.5~70 μmol/L.The detection limit was 0.16 μmol/L (RSN=3). The sensor displayed excellent repeatability for the detection of nitrofurazone, exhibiting a relative standard derivation (RSD) (n=10) of 3.4%. This sensing platform was applied to the analysis of animal-derived foods with the recovery ranging between 92.0% and 107%.
Study on the Effect of GPC Test Conditions on the Molecular Weight Determination Results of PMMA With Orthogonal Optimization
WANG Yanfei, YANG Liguo, WANG Xin, WANG Fang, SONG Haixiang, NIU Yongsheng, WANG Han
2019, 32(4): 611-614.   doi: 10.3969/j.issn.1003-0972.2019.04.017
[Abstract](62) [PDF 454KB](1)
Abstract:
The effect of the Viscotek 270 gel permeation chromatography (GPC) test conditions on the molecular weight determination results of PMMA was studied. Dimethylformamide was used as solvent and mobile phase. Test conditions of such factors as sample concentration, column temperature, and mobile phase flow rate were investigated with orthogonal method as the experimental technique. The results showed that the experimental data was the most reliable when the sample concentration was 2 g/L and column temperature was 35℃ and the flow rate was 1 mL/min.
Pd@Au Nanosheets with High Tumor Targeting Efficiency for Photothermal Therapy
ZHU Xianglong, WANG Qiaoyang, WANG Songwei
2019, 32(4): 615-620.   doi: 10.3969/j.issn.1003-0972.2019.04.018
[Abstract](66) [PDF 1260KB](2)
Abstract:
Pd@Au nanosheets with average diagonal size of 50 nm and thickness of 4 nm, were synthesized from Pd(acac)2 and AuCl(triphenylphosphine)3. Then Pd@Au-PEG nanodrug was obtained followeing by polyethylene glycol modification. Pd@Au-PEG showed strong near infrared absorption (peak at 840 nm) and good photothermal effect. The photothermal treatment performance at the cellular level was studied and it was verified that Pd@Au-PEG could kill cancer cells effectively under 808 irradiation. Tissue distribution in the main organs of mice was further explored, finding that it had a high tumor targeting efficiency. Effective photothermal treatment for solid tumors was finally realized in vivo.
The Preparation and Property of Superhydrophobic Foam for Oil Absorption
YU Ruobing, JIANG Ying
2019, 32(4): 621-625.   doi: 10.3969/j.issn.1003-0972.2019.04.019
[Abstract](60) [PDF 1358KB](1)
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ZnO particles were modified by dodecyltrimethoxysilane (DTMS). Polyurethane foam (PU foam) was coated by modified ZnO particles and named as ZnO-PU foam, which was used for oil absorption directly. The surface structure and morphology of ZnO-PU foam were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and contact angle (CA), and oil-absorption performance of ZnO-PU foam were explored. The results were as follows:(1) the water contact angle of the ZnO-PU foam was 153°, being superhydrophobic; (2) ZnO-PU foam had good oil-absorption performance for different oils with the maximum oil-absorption capacity of 9.55 g/g and the water-absorption capacity of 0.58 g/g. It can be used repeatedly. The ZnO-PU foam was a oil-absorption material with good comprehensive property.
Research on Super Solution Absorption of Expanded Perlite and Sodium Polyacrylateresin Composite Materials
LI Shuiyun, QIN Panpan, ZHANG Yuena, TIAN Yongshang, JING Qiangshan
2019, 32(4): 626-630.   doi: 10.3969/j.issn.1003-0972.2019.04.020
[Abstract](63) [PDF 942KB](2)
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Sodium polyacrylateresins were synthesized by solution polymerization method. The water absorption of resin that was influenced by various contents of potassium persulfateinitiator, N,N'-methylene bisacrylamide (MBA) cross-linking agent, starchgraft, and different degree of neutralization were intensively studied. And the optimum formula of the optimum water absorption resin was obtained. Based on theformula, water and 0.9%NaCl absorption of the composite materials with varying expanded perlite contents were fully researched.Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and X-ray diffraction (XRD) were used to measure the compose and structure characteristic of composite materials. The best solution absorption of composite materials, i.e., water absorption was 589 g/g and 0.9%NaCl absorption was 123 g/g,were found when expanded perlite content was 12%.
Preparation and Photocatalytic Degradation Effect of Bentonite Supported N/Ag Co-doped TiO2 Photocatalysts
YANG Yingqin, CHEN Qingliang, WANG Qingzhi
2019, 32(4): 631-634.   doi: 10.3969/j.issn.1003-0972.2019.04.021
[Abstract](63) [PDF 1154KB](1)
Abstract:
Bentonite supported N/Ag Co-doped TiO2 photocatalyst was prepared by sol-gel method with silver nitrate, four butyl titanate and urea as the main raw materials. The crystal phase and doping composition of the samples were characterized by XRD, XPS, SEM, TEM and EDS, and the degradation experiments of methylene blue solution were carried out under visible light. The results show that nitrogen exists in the form of chemical bonds in the lattice of TiO2, and Ag exists in the form of monodisperse nanoparticles. The specific surface area of the catalyst reaches 49.3 m2/g. The catalyst prepared by calcination at 400℃ had the best degradation effect on 15 mg/L methylene blue at a dosage of 2.0 g/L and illumination time of 50 min, and the degradation rate reached 99.2%.
Studies on Extraction,Structure Analysis and Antioxidant Property of Polysaccharide from Microcoleus vaginatus
RAO Benqiang, ZHANG Shaoli, LI Huijuan, CHEN Yuping, ZHU Yali, LI Yan
2019, 32(4): 635-641.   doi: 10.3969/j.issn.1003-0972.2019.04.022
[Abstract](61) [PDF 1012KB](3)
Abstract:
The Microcoleus vaginatus was screened from the desert soil, the intracellular polysaccharides(IPS) and exopolysaccharide(EPS) were obtained via water extraction and ethanol precipitation method, the extraction rate, yield rate and antioxidant activity were determined respectively. The results proved that the highest extraction rates of intracellular polysaccharide and exopolysaccharide were 3.46% and 77.98% respectively, the highest yield rates of intracellular polysaccharide and exopolysaccharide were 83.67% and 50.76%, respectively. Protein content measured by Coomassie brilliant blue staining method was as low as 3.26%. The polysaccharides can effectively remove the superoxide anion radical, DPPH free radical and hydroxyl radical and weakly chelate ferrous ions in vitro. The analysis of Fourier infrared spectroscopy showed that the hydrogen bonding between molecules were prevalent in the M. vaginatus polysaccharides, and the monosaccharides were present in the form of pyranoside, and the glycosidic bond is α-type.
Study of Preservative Effect of Summer Black Seedless Grapes Via Chitosan Coating and Compound Clove Extract Treatmenting
HAN Yanting, JIANG Linxiang, ZHANG Huage, WANG Quanxiu, YUAN Hongyu, SUN Sisheng, WANG Chao
2019, 32(4): 642-648.   doi: 10.3969/j.issn.1003-0972.2019.04.023
[Abstract](64) [PDF 1267KB](3)
Abstract:
It was reported that the effects of postharvest physiology and storage quality of about 90% mature Summer Black seedless grapes, by coating chitosan with different concentrations(1.0%,1.5%,2.0% and 2.5%)and compound clove extract (CCE) as a reference. As a result, the 1.0%~2.5% chitosan and CCE which coated on the postharvest grapes are both effective in delaying titratable acid and Vitamin C, decreasing polyphenols content, and preventing cellulase activities during an appropriate storage time. Remarkably, the preservative effects of the chitosan coating on the postharvest grapes were better than that of the CCE coating. The chitosan coating with the content of 1.5% was shown the best preservative effect.
The Fermentation Dynamic of Strawberry Wine
WANG Rongrong, JIANG Xingxu, ZHU Jing
2019, 32(4): 649-653.   doi: 10.3969/j.issn.1003-0972.2019.04.024
[Abstract](61) [PDF 666KB](1)
Abstract:
With strawberry as raw materials, strawberry wine were fermented by adding fruit wine yeast into the strawberry pulp.The changes of the number of yeast,sugar content and ethanol content were determined during the fermentation process of the strawberyy wine. Logistic model,Luedeking-Piret model and Dose Resp model were used to establish the models of yeast fermentation cell concentration, sugar content and ethanol production. The results showed that the model fitted the experimental data well, and the average errors were 3.56%, 13.01% and 11.07%, respectively. The model could reflect the dynamic changes of yeast count, sugar content and ethanol content during strawberry wine fermentation.
Comprehensive Technology of Transformation of Low-yielding Camellia oleifera Forest in Mountain Areas of Southern Henan
BU Fujun, QIU Lin, ZHANG Yuhu, ZHOU Chuantao, JIANG Yuanmeng, ZHANG Jianshe, YAN Hongxing, ZHANG Hongwei
2019, 32(4): 654-658.   doi: 10.3969/j.issn.1003-0972.2019.04.025
[Abstract](64) [PDF 389KB](1)
Abstract:
Taking the low-yielding Camellia oleifera forest in southern Henan as the research object, this research were set up by four low-yielding transformation technical measures of Camellia oleifera forest:A (summer hoe and winter reclamation + high-efficiency fertilization + reducing density and pruning + pest control), B (summer hoe and winter reclamation + high-efficiency fertilization + reducing density and pruning), C (summer hoe and winter reclamation + high-efficiency fertilization), D (pest control), and no treatment as control group (CK) to study the effect of different technical measures on Camellia oleifera from the aspects of growth and yield. The results showed that any technical measures in A, B, C and D had a significant promoting effect on the growth of Camellia oleifera, among which the technical measures of A had the most significant promoting effect; The four low-yielding technical measures (A, B, C, D) had a significant role in promoting the yield of fruit and oil of Camellia oleifera, and A technical measures had the most significant role in promoting its yield.
Design of Internet of Orchard Things Based on Improving Fruit Quality by Lowering Night Temperature in Ripening Period
ZHANG Pingchuan, LIU Yanchang, BAI Qiaoling, QU Peixin, GUO Xiaojuan, ZHANG Qingqing, BAI Linfeng, ZHANG Liwei, SUN Hongxing, DENG Jiajun
2019, 32(4): 659-663.   doi: 10.3969/j.issn.1003-0972.2019.04.026
[Abstract](60) [PDF 1207KB](2)
Abstract:
A variety of sensors, embedded systems, LoRa wireless technology and computer are comprehensively used to realize an orchard IoT(Internet of Things), which meet the general orchard environment parameter acquisting, monitoring and intelligent irrigation, especially improve the fruit quality by reducing the orchard night temperature when spraying the constant 16℃ well water mist in fruit ripening period from June to August, so that the respiration of fruit trees were weakened, the organic matter accumulation was promoted and the fruit sugar was increased. The verified experiment was done in an amygdalus persical orchard. The results showed that the orchard night temperature was reduced down to 17℃, and the broadcast wheather temperature was 37℃~28℃, the diurnal temperature difference was about, cooling effect was remarkable.
Multi-objective Optimization Model and Algorithm for Weapon-Target Assignment Problem in Joint Fire Strike
XUAN Hejun, XIANG Yong, HE Xiaoqiang, LIU Daohua
2019, 32(4): 664-669.   doi: 10.3969/j.issn.1003-0972.2019.04.027
[Abstract](60) [PDF 762KB](4)
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It is a challenge problem to determine the optimal scheme of weapon and target assignment in joint fire strike. To solving this problem, a two objective optimization model, which maximize the benefit and minimize capital expenditure, is established. In addition, the optimal strike scheme of target determined in potential targets is consideration. According the preference, the two objective optimization model is translation into the global constraint optimization model by using weighted sum method. A genetic algorithm, which has high efficient crossover and mutation operators, is designed. Simulation experimental results show that the proposed algorithm can obtain the better schemes than the compared algorithms.
Classification for Imbalanced Data Streams Based on Cost-sensitive
SUN Yange, SHAO Han, YANG Yancong
2019, 32(4): 670-674.   doi: 10.3969/j.issn.1003-0972.2019.04.028
[Abstract](62) [PDF 383KB](3)
Abstract:
In the process of data stream classification, class imbalance and concept drift are two major challenges. On the basis of feature selection and cost-sensitive learning, the idea of cost-sensitive learning algorithm is introduced into the feature selection algorithm, and a cost-sensitive ReliefF method is designed and implemented. The algorithm can not only delete redundant features, but also adapt to dynamic data stream environment. The classical algorithms are analyzed and compared, and the results show that the proposed algorithm can significantly improve the performance of classification.
Semantic Relatedness Computation Method Under Low Dimensional Explicit Semantic Space
LI Pu, JIANG Jintao, ZHANG Zhifeng, SHEN Hongxue, LIANG Hui, TANG Hui
2019, 32(4): 675-682.   doi: 10.3969/j.issn.1003-0972.2019.04.029
[Abstract](62) [PDF 526KB](1)
Abstract:
Semantic relatedness computation is a critical fundamental issue in data science. It has a wide range of applications in information retrieval and natural language processing. In view of the current limitations of ESA (Explicit Semantic Analysis) algorithm, a feature selection algorithm is presented to filter the explicit semantic features, and the low dimensional semantic space is constructed. On this basis, according to the mapping information of feature concepts in Wikipedia, a semantic relatedness computation method is proposed under low dimensional explicit semantic space. This method can improve the efficiency of ESA in the following relatedness computing process under high dimensional sparse space. Finally, the experimental results demonstrate that the proposed method has a better correlation on Pearson's (P) and Spearman's (S) correlation coefficient with the intuitions of human judgments than other related works.
Experimental Study on the Dynamic Shear Modulus and Damping Ratio of Granite Residual Soil
YIN Song, ZHANG Hao, LI Xinming, BAI Linjie
2019, 32(4): 683-688.   doi: 10.3969/j.issn.1003-0972.2019.04.030
[Abstract](62) [PDF 1299KB](1)
Abstract:
Taishan granite residual soil was taken as the research object, the dynamic shear modulus G and damping ratio D of granite residual soil under different stress states were studied and predicted by resonance column test.The model prediction analysis was carried out. The research shows that the test points of G-γ present typical hyperbolic distribution, and the influence of confining pressure decreases with theγ increased. The influence of confining pressure on the relationship between D and γ is not obvious. The double logarithmic model may reflect the relationship between Gmax and γ, the model can be used to predict the parameters of Gmax. Under the small strain, the curves of the relationship between G and γof the soil under different stress states are close to each other, when the γ>10-5, the G value decreases rapidly under various confining pressures. In the selection of engineering parameters, attention should be paid to the variation of shear modulus with stress state (depth) in small strain range. Martin-Davidenkov model and the empirical relationship between D and γ has been used to built the variation law of G/Gmax and D with γ, and the dynamic shear modulus and damping ratio of small strain range are used as recommended values. This study may provide technical reference for similar projects.
Studies on Horizontal Vibration of Single Pile in Fractional Derivative Viscoelastic Soil
NIU Jienan, GAO Yunfei, ZHOU Gang, YUAN Xiaohui
2019, 32(4): 689-696.   doi: 10.3969/j.issn.1003-0972.2019.04.031
[Abstract](68) [PDF 1967KB](5)
Abstract:
The soil is seen as a viscoelastic medium. Fractional constitutive equations are used to describe the stress-strain relationship of viscoelastic soils. The horizontal vibrational equations of the soil-sill core soil around a single pile are established and solved under axisymmetric coordinates. The analytical solution of horizontal dynamic resistance of single pile in fractional viscoelastic soils is obtained. The numerical examples are used to analyze the effect of pile-soil constant and model parameters on the horizontal dynamic resistance of a single pile. The results show that the fractional differential operator order of the soil around the pile has a great effect on the horizontal dynamic resistance of the single pile; The constitutive model constants of the soil around the soil and the pile have a significant effect on the horizontal dynamic impedance stiffness factor, while the influence on the impedance factor is relatively small.
Journal introduction

Started:in 1981,Quarterly

Administrative Department: Xinyang Normal University

Sponsor:Xinyang Normal University

Editor & Publisher:the Editorial Department of Journal of Xinyang Normal University

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