The effect of agricultural price-support policies on interregional and rural-to-urban migration in Korea: 1976-1980

The impact of rice price-support policies, designed to increase farmers' income and reduce rural-urban migration in the Republic of Korea, is examined for the period 1976-1980 using a polytomous logistic model. "Our findings revealed that the elasticity of migration with respect to rice yield per origin farm household is positive and is significantly different from zero. The elasticities of migration with respect to rate of urbanization, particularly urban concentration-agglomeration, and population size of the destination are also positive and are significantly different from zero....Our findings questioned the wisdom of employing rice price price-support programs as a viable policy for reducing interregional and rural-to-urban migration in Korea."     

“芯”血

机油,一直是很多汽车用户熟知的一个词汇,那机油到底是干什么用的呢？那些标号代表什么意思？什么车适合用什么机油最合适？今天我们的「全动力」FullyPower机油专题就会从机油的最本质出发,为您分析如何选购机油。     

Last Call: decreasing drunk driving among 21-34-year-old bar patrons

Any effort to decrease the toll of drunk driving must include efforts directed at people who drink in bars, particularly young adults who use motor vehicles after drinking. We designed a multifaceted social marketing campaign, Last Call, to increase the use of designated drivers and safe rides homes among 21-34-year olds. There were three components to the intervention: (1) use of taxi stands to promote taxi use; (2) point-of-sale information to patrons at partner bars and (3) a mass media campaign to support the designated driver/safe ride home message. Among the heaviest drinkers, the programme significantly increased the use of designated drivers and increased the use of taxis by 63%.     

桔小实蝇及其近缘种

桔小实蝇的描述(图 1a—f)桔小实蝇,可作如下的主要描述:Dacus(Strumeta)[Dacus s.1.各具一对小盾鬃,小盾前鬃和前翅上鬃;雄虫翅具加翅叶(图1a),雄虫第3腹节背板上具鬃列(图1f)],颜面两侧各具一大的卵形到长椭圆形的黑斑。额宽为长的一倍半,具两对下侧额鬃和一对长侧额鬃(图1e)。中胸黑色或具明显的黑斑(完全硬化的标本),具一对宽的后缝色条(图1d)。小盾片除基部的狭窄黑带外,全为黄色。翅很透明;前缘室透明;前缘带很发达,此带延伸到翅端约达 R_5室的半途,     

以色列的梨火疫病

由Erwinia amylovora引起的火疫病,是北美、欧洲及世界其它一些地区的梨树和蔷薇科有关植物上的一种重要病害。但是在地中海地区该病仅是近年才成为一棘手问题。1982年和1983年埃及植物病理学家报道过该病损失严重。     

Prototyping: a key to managing product development

Extended development cycles put companies at risk through loss of sales, margins, market share, and credibility as innovators. The author suggests constructing early-stage models to provide a dress rehearsal for new products and help companies develop products in less time.