Comparative evaluation of predicted and measured performance of a 68-cubic meter truncated reverberant noise chamber

The performance of a medium size, truncated reverberation chamber is evaluated in detail. Chamber performance parameters are predicted, using classical acoustic theory, and are compared to results from actual chamber measurements. Discrepancies are discussed in relation to several available empirical corrections developed by other researchers. Of more practical interest is the confirmation of a recent theory stating that the present guide for the ratio of specimen volume to test chamber volume, approximately 10 percent, is overly conservative, and can be increased by a factor of at least 2 and possibly 3. Results and theoretical justification of these findings are presented

Automated data pre-processing via meta-learning

The final publication is available at link.springer.comA data mining algorithm may perform differently on datasets with different characteristics, e.g., it might perform better on a dataset with continuous attributes rather than with categorical attributes, or the other way around. As a matter of fact, a dataset usually needs to be pre-processed. Taking into account all the possible pre-processing operators, there exists a staggeringly large number of alternatives and nonexperienced users become overwhelmed. We show that this problem can be addressed by an automated approach, leveraging ideas from metalearning. Specifically, we consider a wide range of data pre-processing techniques and a set of data mining algorithms. For each data mining algorithm and selected dataset, we are able to predict the transformations that improve the result of the algorithm on the respective dataset. Our approach will help non-expert users to more effectively identify the transformations appropriate to their applications, and hence to achieve improved results.Peer ReviewedPostprint (published version

Composite Reflective/Absorptive IR-Blocking Filters Embedded in Metamaterial Antireflection Coated Silicon

Infrared (IR) blocking filters are crucial for controlling the radiative loading on cryogenic systems and for optimizing the sensitivity of bolometric detectors in the far-IR. We present a new IR filter approach based on a combination of patterned frequency selective structures on silicon and a thin (50 $\mu \textrm{m}$ thick) absorptive composite based on powdered reststrahlen absorbing materials. For a 300 K blackbody, this combination reflects $\sim$50\% of the incoming light and blocks \textgreater 99.8\% of the total power with negligible thermal gradients and excellent low frequency transmission. This allows for a reduction in the IR thermal loading to negligible levels in a single cold filter. These composite filters are fabricated on silicon substrates which provide excellent thermal transport laterally through the filter and ensure that the entire area of the absorptive filter stays near the bath temperature. A metamaterial antireflection coating cut into these substrates reduces in-band reflections to below 1\%, and the in-band absorption of the powder mix is below 1\% for signal bands below 750 GHz. This type of filter can be directly incorporated into silicon refractive optical elements

Corn cutworm control

"This guide recommends management practices and insecticides for reduction of injury caused by the various cutworms attacking corn in Missouri. It also discusses the life cycles of the more common species which feed at and below ground and those species which are primarily above ground foliage feeders."--First page.Gene Munson, Armon J. Keaster, and Judy A. Grundler (Department of Entomology, College of Agriculture)Revised 2/86/4.5

Control of wireworms and other corn soil insects 1984

"This guide recommends management practices and insecticides for reduction of the following corn soil insect pest problems: wireworms, white grubs and annual grubs, billbugs, sod webworms, seed damaging insects, bird and rodent damage to seed and seedlings and insect pest control in no-tillage sod plantings."--First page.Gene Munson, Armon J. Keaster, and Judy A. Grundler (Department of Entomology College of Agriculture)Revised 2/84/5

Corn rootworm control 1984

"The three species of corn rootworms attacking corn in Missouri are commonly known as northern, southern and western corn rootworms. The northern and southern species are state-wide in their distribution. The western species is known to occur over the northern two-thirds of the state Gasper to Perry Counties and northward). Western corn rootworm larval and adult numbers were on on the increase in 1983 and comprised over 90 percent of the total rootworm population in the research plots in northwest Missouri. The potential for economic damage from northern and western species is also confined to the northwestern counties, extending from Buchanan County northeastward to Harrison County."--First page.Gene Munson, Armon J. Keaster, and Judy A. Grundler (Department of Entomology, College of Agriculture)Revised 2/84/5

Control of wireworms and other corn soil insects : 1985

"This guide recommends management practices and insecticides for reduction of the following corn soil insect pest problems: wireworms, white grubs and annual grubs, billbugs, sod webworms, seed damaging insects, bird and rodent damage to seed and seedlings and insect pest control in no-tillage sod plantings."--First page.Gene Munson, Armon J. Keaster, and Judy A. Grundler (Department of Entomology, College of Agriculture)Revised 2/85/5

Control of wireworms and other corn soil insects

"This guide recommends management practices and insecticides for reduction of the following corn soil insect pest problems: wireworms, white grubs and annual grubs, billbugs, sod webworms, seed damaging insects, bird and rodent damage to seed and seedlings and insect pest control in no-tillage sod plantings."--First page.Gene Munson, Armon J. Keaster and Judy A. Grundler (Department of Entomology, College of Agriculture)Revised 2/86/4.5

Soil insect control in reduced tillage cropping systems

"Missouri row crop producers have rapidly accepted and adopted reduced, conservation or no-till practices. They planted 45 percent or 5,000,000 acres of the 1983 crop of soybeans, corn, small grains and grain sorghum in soil receiving some degree of reduced tillage. Although reduced tillage practices offer several advantages, one disadvantage is difficult insect control. Major insect problems occur more frequently and are often more damaging with reduced than with conventionally tilled crops."--First page.Gene Munson, Armon J. Keaster and Judy A. Grundler (Department of Entomology, College of Agriculture)Revised 2/84/6