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基于自愈技术的山区配电网自动化策略研究

科技创新与生产力 2024年第2期45卷 122-125页

作者：张展宇党晨阳国网汉中市供电公司陕西汉中723000

针对山区供电可靠性较低的问题,在分析配电网自动化控制策略的基础上,研究自愈技术在典型供电故障处理中的应用,进而提出基于自愈技术的山区配电网络改造升级方案,优化线路联络点配置。自愈改造方案在24条线路中实际应用,取得了良好的... 详细信息

针对山区供电可靠性较低的问题,在分析配电网自动化控制策略的基础上,研究自愈技术在典型供电故障处理中的应用,进而提出基于自愈技术的山区配电网络改造升级方案,优化线路联络点配置。自愈改造方案在24条线路中实际应用,取得了良好的效果。与改造前相比,发生N-1对地故障时,停电负荷显著降低,受影响的用户数量显著减少,提高了供电可靠性。

关键词：山区配电网自动化策略自愈技术

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泛安全化现象与南亚东南亚政治经济形势演进

印度洋经济体研究 2024年第1期 1-23,160页

作者：叶海林吴俊张展毓中国社会科学院亚太与全球战略研究院中国社会科学院大学

新冠肺炎疫情结束后,包括南亚东南亚次区域在内的中国周边地区地缘格局深入演化,区域局势和地区秩序出现了显著变动与重大调整。不论是从区域整体态势变化角度看,还是从区域内主要行为体政治经济形势演进视角分析,南亚东南亚区域受到了... 详细信息

新冠肺炎疫情结束后,包括南亚东南亚次区域在内的中国周边地区地缘格局深入演化,区域局势和地区秩序出现了显著变动与重大调整。不论是从区域整体态势变化角度看,还是从区域内主要行为体政治经济形势演进视角分析,南亚东南亚区域受到了国际格局演化驱动方式和方向的强烈影响,尤其是新冠肺炎疫情的演化、美国全球战略调整、俄乌冲突等三大因素影响。后疫情时代的美国对华战略更加极端化,中美博弈加速了中国周边地区力量格局演变与秩序重组。美国凭借联盟体系化优势对中国进行全方位极限施压,加深了中美矛盾。中美斗争外延至中国和周边国家关系,催生出周边多国的对华机会主义策略与选边站队的行为。未来,中国周边地区泛安全化趋势将进一步凸显,中国经略周边的安全挑战将明显增加。

关键词：泛安全化印太战略俄乌冲突政治经济形势

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基于PLC的造纸机电气传动系统设计

模具制造 2024年第8期24卷 186-188页

作者：刘富民林吉靓张展裕宋喜艳牟鹏新疆理工学院机电工程学院新疆阿克苏843000

随着制造业智能化进程的加速,传统的造纸生产方式面临着效率低下、操作复杂等问题,因此,引入先进的控制技术成为提升产业竞争力的关键之一。在这一背景下,以提高生产效率、优化设备管理为目标,对造纸机电气传动系统进行了设计与研究。对... 详细信息

随着制造业智能化进程的加速,传统的造纸生产方式面临着效率低下、操作复杂等问题,因此,引入先进的控制技术成为提升产业竞争力的关键之一。在这一背景下,以提高生产效率、优化设备管理为目标,对造纸机电气传动系统进行了设计与研究。对PLC技术在造纸机电气传动系统中的优势体现、造纸工艺要求分析以及基于PLC的系统设计等方面进行阐述,旨在为造纸行业的智能化转型提供理论建议,为促进传统行业向智能制造的转变提供助力。

关键词： PLC 造纸机电气传动系统设计

Hillslope soil erosion and runoff model for natural rainfall events

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Acta Mechanica Sinica 2008年第3期24卷 277-283页

作者： zhanyu zhang Guohua zhang Changqing Zuo Xiaoyu Pi Agricultural Engineering College Hohai UniversityNanjing 210098 China Soil and Water Conservation Research Institute of JiangxiProvince Nanchang 330000 China The Water Service Bureau of Chaoyang of Beijing City Beijing 100026 China

By using the momentum theorem and waterbalance principle, basic equations of slope runoff were derived, soil erosion by raindrop splash and runoff were discussed and a model was established for decribing hillslope soil erosion processes. The numerical solution of the model was obtained by adopting the Preissmann format and considering the common solution-determining conditions, from which not only the runoff and soil erosion but also their processes can be described. The model was validated by ten groups of observation data of Soil Conservation Ecological Science and Technology Demonstration Park of Jiangxi Province. Comparisons show that the maximum relative error between simulation and experimental data is about 10.98% for total runoff and 15 % for total erosion, 5.2% for runoffprocess and 6.1% for erosion process, indicating that the model is conceptually realistic and reliable and offers a feasible approach for further studies on the soil erosion process.

关键词： Overland flow Raindrop splash Runoff Erosion process Numerical simulation

Three-dimensional structural models,evolution and petroleum geological significances of transtensional faults in the Ziyang area,central Sichuan Basin,SW China

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Petroleum Exploration and Development 2024年第3期51卷 604-620页

作者： TIAN Fanglei GUO Tonglou HE Dengfa GU zhanyu MENG Xianwu WANG Renfu WANG Ying zhang Weikang LU Guo School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism Ministry of EducationBeijing 100083China Sinopec Southwest Oil and Gas Company Chengdu 610031China

With drilling and seismic data of Transtensional(strike-slip)Fault System in the Ziyang area of the central Sichuan Basin,SW China plane-section integrated structural interpretation,3-D fault framework model building,fault throw analyzing,and balanced profile restoration,it is pointed out that the transtensional fault system in the Ziyang 3-D seismic survey consists of the northeast-trending FI19 and FI20 fault zones dominated by extensional deformation,as well as 3 sets of northwest-trending en echelon normal faults experienced dextral shear *** them,the FI19 and FI20 fault zones cut through the Neoproterozoic to Lower Triassic Jialingjiang Formation,presenting a 3-D structure of an“S”-shaped *** before Permian and during the Early Triassic,the FI19 and FI20 fault zones underwent at least two periods of structural ***,the 3 sets of northwest-trending en echelon normal faults are composed of small normal faults arranged in pairs,with opposite dip directions and partially left-stepped *** before Permian,they had formed almost,restricting the eastward growth and propagation of the FI19 fault *** FI19 and FI20 fault zones communicate multiple sets of source rocks and reservoirs from deep to shallow,and the timing of fault activity matches well with oil and gas generation *** there were favorable Cambrian-Triassic sedimentary facies and reservoirs developing on the local anticlinal belts of both sides of the FI19 and FI20 fault zones,the major reservoirs in this area are expected to achieve breakthroughs in oil and gas exploration.

关键词： transtensional(strike-slip)fault three-dimensional structural model structural evolution petroleum geological significance Ziyang area Sichuan Basin

Irrigation scheduling for corn in a coastal saline soil

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International Journal of Agricultural and Biological Engineering 2016年第6期9卷 91-99页

作者： Chang Tingting Shao Xiaohou Ye Huan Li Wei zhang Jie zhang zhanyu Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China of Ministry of Education Hohai UniversityNanjing 210098China College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China Water Conservancy and Hydropower Investigation and Design Institute of Hebei Tianjin 300250China

Currently,water scarcity is serious and the irrigation scheduling with efficient water use becomes important in *** this study,irrigation systems were scheduled in the saline area along Laizhou *** study was conducted to determine the relation of irrigation regime and crop yield from 2010 to 2012,and the representative rainfall years(high-flow year,normal-flow year and low-flow year)were calculated by analyzing rainfall frequency over 30 *** irrigation regimes were set according to local farmers’*** amounts of T1,T2,T3,T4,T5 and T6 were 225.0 mm,270.0 mm,337.5 mm,300.0 mm,360.0 mm and 450.0 mm,respectively,with the same frequency of four *** results showed that soil salt content decreased with the increase of irrigation water *** corn yield varied from 6560 kg/hm2 to 8060 kg/*** highest yield was obtained from *** functions related to irrigated water(I,mm)for corn yield(Y,kg/hm2)was Y=−0.0397I2+1059.6(R2=0.8892).Aiming at high corn yield,total water supply(irrigation and rainfall)to corn crops was 859 *** amounts at low-flow year(p=80%),normal-flow year(p=50%)and high-flow year(p=20%)were obtained by the simulation of rainfall frequency curve,which were 348 mm,457 mm and 604 mm respectively in the whole growth period(from late June to mid-October).In order to obtain the highest theoretical corn yield,according to field results and rainfall,the optimum irrigation frequency at low-flow year,normal-flow year or high-flow year was four times for corn in the saline area along Laizhou Bay.

关键词： corn(Zea mays) irrigation regime desalination rainfall soil salinity

Effects of irrigation regimes on soil NO_(3)^(-)-N, electrical conductivity and crop yield in plastic greenhouse

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International Journal of Agricultural and Biological Engineering 2019年第1期12卷 109-115页

作者： Tingting Chang Yujie zhang zhanyu zhang Xiaohou Shao Weina Wang Jie zhang Xu Yang Huilian Xu Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China of Ministry of Education Hohai UniversityNanjing 210098China College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China International Nature Farming Research Center Matsumoto390-1401Japan

Developing water-saving irrigation regimes has important practical significance not only in alleviating the crucial water shortage,but also in controlling soil salinization for the protected cultivation in eastern China.A field study with six treatments was conducted to evaluate the effects of different irrigation regimes with subdrainage systems on the soil nitrate nitrogen,salinity and moisture,also evaluate the effects on tomato growth,fruit yield and irrigation water use efficiency(IWUE).The treatments were distinguished by three different irrigation amounts of 310 mm,360 mm and 410 mm,and two irrigation frequencies of 7 and 11 *** showed that the irrigation amount had significant effects on the soil NO_(3)^(-)-N and electric conductivity(EC).A positive correlation was detected between soil NO_(3)^(-)-N(x)and EC(y)at 0-20 m depth after harvest,with a linear equation of y=*** volumetric moisture at 0.10 m and 0.20 m depth was increased as the irrigation amount ***,a higher amount of irrigation increased the fruit yield but reduced the IWUE of *** was also found that smaller irrigation amounts combined with frequent intervals could increase fruit yield and ***,the fruit quality of tomato had a significant(p<0.05)negative correlation with irrigation ***,the parameters of irrigation regime including the irrigation amount and intervals should be considered comprehensively in order to find a compromise between salinity control and irrigation water use efficiency improvement.

关键词： irrigation regimes greenhouse tomato soil nitrate nitrogen soil electric conductivity soil salinity water use efficiency

Osmotic adjustment and up-regulation expression of stress-responsive genes in tomato induced by soil salinity resulted from nitrate fertilization

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International Journal of Agricultural and Biological Engineering 2018年第3期11卷 126-136页

作者： Tingting Chang Yujie zhang Huilian Xu Xiaohou Shao Qicong Xu Fenglan Li Lina Yu zhanyu zhang Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China of Ministry of Education Hohai UniversityNanjing 210098China College of Agricultural Science and Engineering Hohai UniversityNanjing210098China International Nature Farming Research Center Matsumoto390-1401 Japan Northeast Agricultural University Harbin 150000China Rizhao Institute of Agricultural Sciences Rizhao276800China

Concerns about the soil salinity caused by excessive fertilization have prompted scientists to clarify the detailed mechanisms and find techniques to alleviate the damage caused by this kind of soil *** of this study were to elucidate the effect of soil salinity caused by nitrate fertilization and the differences in salinity effect between nitrate salts and NaCl salt with analyses at various levels of crop physiology and molecular biology.A microbial inoculation was also tried to verify whether it could alleviate the salinity-induced loss and *** three experiments(Exp I,II and III),nitrate salts(NS)of Ca(NO_(3))_(2) and KNO_(3) were applied to potted tomato plants to simulate the soil salinity caused by fertilization and a microbial inoculant(MI)was *** was measured using *** adjustment was analyzed using the mathematically modeled pressure-volume curve;O_(2)-concentration and activity of SOD and nitrate reductase were *** of nitrate reductase gene and the stress-responsive gene DREB2 was analyzed using the real-time PCR *** Exp I and II,where the applied NS amount was moderate,NS application at low concentration induced increases in O_(2)-and MDA concentrations and plants acclimated to the soil salinity as the treatment prolonged for *** acclimation was contributed by osmotic adjustment,activation of SOD and re-compartmentation of cell water between symplasm and *** adjustments might be ultimately attributed to up-regulation of stress-responsive genes such as DREB2 as well as the nitrate reductase(NR)***,in Exp III,applications of NaCl and NS at high concentration could not show positive effects as NS *** of MI synergistically increased the xerophytophysiological regulation caused by NS and alleviated the salinity damage in addition to its own positive effects on the tomato *** from NaCl,nitrate salts at low application rate increased the total b

关键词： nitrate fertilizer osmotic adjustment salinity stress soil salinization tomato(Solanum lycopersicum) xerophytophysiology microorganism bioremediation

等温热处理对Mg-7Zn-1Cu-0.3Mn-xNd合金组织的影响

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特种铸造及有色合金 2022年第6期42卷 705-712页

作者：黄晓锋杨凡尚文涛张展裕张胜兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室兰州理工大学有色金属合金及加工教育部重点实验室

设计了Mg-7Zn-1Cu-0.3Mn-xNd(x=0,0.1,0.3,0.5,质量分数,%)镁合金,利用OM、XRD以及SEM等观察了不同Nd添加量时合金的铸态组织以及经过等温热处理后的半固态非枝晶组织演变,探索了Mg-7Zn-1Cu-0.3Mn-0.3Nd合金的最佳等温热处理工艺。结果... 详细信息

设计了Mg-7Zn-1Cu-0.3Mn-xNd(x=0,0.1,0.3,0.5,质量分数,%)镁合金,利用OM、XRD以及SEM等观察了不同Nd添加量时合金的铸态组织以及经过等温热处理后的半固态非枝晶组织演变,探索了Mg-7Zn-1Cu-0.3Mn-0.3Nd合金的最佳等温热处理工艺。结果表明,Mg-7Zn-1Cu-0.3Mn-xNd合金的铸态组织主要由α-Mg、Mg_(4)Zn_(7)、NdCu_(2)和CuMgZn相组成,加入0.3%的Nd对晶粒具有最好的细化效果,共晶组织分布更加弥散;Mg-7Zn-1Cu-0.3Mn-0.3Nd合金在595℃下保温30 min后可获得最理想的半固态非枝晶组织,其固相率、固相颗粒的形状因子和平均晶粒尺寸分别为57.59%、1.38和44.56μm。非枝晶组织的演变由4个阶段构成,分别为初始的粗化阶段、组织分离、球化以及最后的粗化。

关键词： Mg-7Zn-1Cu-0.3Mn-xNd合金等温热处理半固态演变过程