简介:摘要:当前在我国经济飞速发展的背景下,我国的工业生产电气自动化水平也在不断的提升。而电气自动化的发展过程中离不开PLC机电一体化技术的应用。为了进一步提升电气自动化的控制水平,需要加大对PLC及电一体化技术的研究力度,确保其作用的充分发挥,推动我国工业生产领域快速有效发展。
简介:Sandydesertificationislanddegradationcharacterizedbywinderosionmainlyresultedfromtheexcessivehumanactivitiesinarid,semiaridandpartofsub-humidregionsinnorthernChina.Theresearchonsandydesertificationhasexperiencedmorethan5decadesofarduouscourseofthestrugglealongwiththeestablishmentanddevelopmentofChina′sdesertscience.Researchesinthisfieldhavemadeagreatcontributiontothenationaleconomicconstruction,andenvironmentalprotection.Thispaperfocusesonpresentingthemajorprogressandachievementsinthesandydesertificationresearchduringthelast50years,includingthestagesofstudyonsandydesertification,backgroundenvironmentofsandydesertificationanditschanges,theconception,causes,process,monitoringandassessmentofsandydesertification,thevegetationsuccession,landscapeecology,plantphysiology,impactsonecosystem,high-effectiveuseofwaterandlandresourcesandsustainabledevelopmentinsandydesertifiedregions,sandydesertificationcontrolmodelsandtechniquesetc.