There are various designs of tools and equipment used for harvesting the crops and threshing it separately. Sickles, hand tools and reapers for grain crops and diggers for tuber crops and rhizomes, operated with different power sources are used. Combine harvesters, both tractor mounted and self-propelled, are being very widely used for different grain crops. Functional requirements and principl...

This paper extends the semiparametric eÆcient treatment of panel data models pursued by Park and Simar (1994) and Park, Sickles, and Simar (1998, 2003) to a dynamic panel setting. We develop a semiparametric eÆcient estimator under minimal assumptions when the panel model contains a lagged dependent variable. We apply this new estimator to analyze the structure of demand between city pairs for ...

Experimental archaeology at a Natufian site in the Southern Levant documents for the first time the use of 12,500-year-old rock-cut mortars for producing wild barley flour, some 2,000 to 3,000 years before cereal cultivation. Our reconstruction involved processing wild barley on the prehistoric threshing floor, followed by use of the conical mortars (a common feature in Natufian sites), thereby...

Foreign Direct Investment (FDI) in developing countries is expected to foster technology transfer from foreign-owned to local firms. Using detailed panel data from Tunisian manufacturing firms, we show that technological spillovers generated by FDI, as a form of technology transfer, help firms move near the best practice frontier (production frontier) measured by the Schmidt and Sickles method....

Coxsackie is a village on the banks of the Hudson River in upper New York State. In the course of investigating an outbreak of poliomyelitis there, Dalldorf and Sickles (1948) isolated a hitherto unrecognized filterable agent from the faeces of two children with lower limb paralysis. Neutralizing antibodies for this new virus appeared in the blood of both patients during convalescence. Attempts...

The diagnosis of ND begins with its characterization as either a physiological or pathological condition (Simmons et al., 2003). Physiological discharge, often a manifestation of breast manipulation, is usually bilateral, is white or green, and emanates from many ducts (Simmons et al., 2003). Possible causes of persistent physiological discharge include oral contraceptives, antihypertensives, t...

During the Prehistoric period, Human is used tools that helped him in process of cutting plants or hunting animals, and then he developed his a manner suitable for their use became variety, among those sickle even after emergence agriculture. It continued to be despite different available raw materials throughout chronology ages. Sickles began since stone ages before agriculture until now. As i...

Between 1948 and 1950, Dalldorf and Sickles (1948), Dalldorf and others (1949), Dalldorf (1950), and Sickles and Dalldorf (1949) reported a previously unidentified virus in the faeces of children with the symptoms of acute anterior poliomyelitis. This virus has been named Coxsackie or C.-virus, and many authors (Magnus, 1949; Kaplan and Melnick, 1951; Melnick, 1947, 1950a, 1950b; Melnick and Go...