With increasing demand for better yield in agricultural areas, soil physical property representative measurements are more and more essential. Nuclear techniques such as computerized tomography (CT) and gamma-ray attenuation (GAT) have been widely employed with this purpose. The soil mass attenuation coefficient (μ(s)) is an important parameter for CT and GAT analysis. When experimentally deter...

Case 1 A 39-year-old Japanese man presented with 6-month history of a group of papules on the chest (Figure 1A). The patient had no specific symptoms, such as itching or tenderness, but visited the clinic worried about the long duration of the lesions. Physical examination showed pinkish white, firm papules of 5 to 10 mm in diameter with sharply demarcated borders. The surface of the papules wa...

N UMMULAR OR DYSREGULATIVE MICRObial eczema, which is a subtype of chronic dermatitis, is characterized by coin-shaped, sharply demarcated, erythematous lesions with serous exudates demonstrated on dermatopathologic examination. These serum exudates can be seen dermoscopically as shiny yellow clods with a diameter of 1 to 2 mm. The closest differential diagnoses, which are psoriasis and tinea c...

Changes in soil physical and chemical properties were evaluated in several on-farm studies located in rainfed, hardsetting red Al®sols (Ferric Luvisols) and in irrigated, self-mulching Vertisols (Chromic Vertisols) of eastern Australia. The objective of the studies was to evaluate changes in soil physical and chemical properties with time under commercial farming situations where changes had be...

A healthy 2-year-old girl presented with a rash on her shoulder of 6 months’ duration. Physical examination revealed a solitary 5 mm erythematous dome-shaped papule surrounded by numerous smaller similar lesions (Figure 1). Dermatoscopy visualized numerous central white and skincolored clods with vessels arranged radially to the clods (Figure 2). What is your diagnosis? Please send your answer ...

*Lawrence J. Hagen, USDA-ARS, Wind Erosion Research Unit, Throckmorton Hall 2004, Kansas State University, Manhattan, KS 66506. *Corresponding author: [email protected]. Contribution from USDA-ARS in cooperation with Kansas Agric. Exp. Sta., Contribution No. 99-389-A. ABSTRACT Assessment of wind erosion parameters applicable to the field scale using wind tunnels requires attention to both scal...

In this paper, an efficient numerical solution for the scattering problem of inhomogeneous dielectric rough surfaces is presented. The inhomogeneous dielectric random surface represents a bare soil surface and is considered to be comprised of a large number of randomly positioned dielectric humps of different sizes, shapes, and dielectric constants above an impedance surface. Clods with nonunif...

Blowing dust from summer fallow is a major soil loss and air quality concern in winter wheat (Triricum aesrivum L.) production areas of the inland Pacific Northwest (PNW). The objective of our 3-yr onfarm study in a 286-mm precipitation zone in eastern Washington was to determine the effects of tillage mulch depth during fallow on surface soil roughness, residue retention, seed-zone water stora...