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32.
Louis Kruh 《Cryptologia》2013,37(3):255-260
ABSTRACT The National Archives and Records Administration (NARA) is an excellent source of cryptologic material and is readily available to the public on-line. We describe many of it resources which should prove interesting for cryptology scholars. 相似文献
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Treatment of complex gaseous emissions emitted by a rendering facility using a semi‐industrial biofilter 下载免费PDF全文
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The equations that govern the various transport phenomena occurring in a polymer electrolyte membrane fuel cell (PEMFC) were formulated and implemented in a commercial finite element software, in order to predict the fuel cell current density with respect to the operating conditions. The numerical model showed polarization curves in accordance with literature. The catalyst utilization was then improved by optimizing the platinum distribution (design variable) in the fuel cell, so as to maximize current density (objective function) for a fixed total amount of platinum (constraint). The first analysis showed that, for equal anode and cathode catalyst layer thicknesses, maximal current density was achieved by placing more catalyst in the cathode than in the anode. The second analysis showed that, for equal anode and cathode catalyst layer density, maximal current density was achieved by using a catalyst layer that is thicker on the cathode side than that on the anode side. Finally, a topological optimization of the platinum density within the cathode catalyst layer was performed with a gradient based algorithm, and the results showed that at a high stoichiometric ratio, the best design has most of its platinum placed where the reaction rate is the highest, i.e., close to the membrane layer. 相似文献
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Chronic obstructive pulmonary disease in patients with end‐stage kidney disease on hemodialysis 下载免费PDF全文
Louis L. Plesner Peder E. Warming Ture L. Nielsen Morten Dalsgaard Morten Schou Ulla Høst Casper Rydahl Lisbet Brandi Lars Køber Jørgen Vestbo Kasper Iversen 《Hemodialysis international. International Symposium on Home Hemodialysis》2016,20(1):68-77
The objectives of this study were to assess the prevalence of chronic obstructive pulmonary disease (COPD) in hemodialysis patients with spirometry and to examine the effects of fluid removal by hemodialysis on lung volumes. Patients ≥18 years at two Danish hemodialysis centers were included. Forced expiratory volume in one second (FEV1), forced vital capacity (FVC), and FEV1/FVC ratio were measured with spirometry before and after hemodialysis. The diagnosis of COPD was based on both the GOLD criteria and the lower limit of normal criteria. There were 372 patients in treatment at the two centers, 255 patients (69%) completed spirometry before dialysis and 242 of these (65%) repeated the test after. In the initial test, 117 subjects (46%) had airflow limitation indicative of COPD with GOLD criteria and 103 subjects (40.4%) with lower limit of normal criteria; COPD was previously diagnosed in 24 patients (9%). Mean FVC and FEV1 decreased mildly after dialysis (FVC: 2.84 to 2.79 L, P < 0.01. FEV1: 1.97 to 1.93 L, P < 0.01) Hemodialysis did not affect the FEV1/FVC ratio or number of subjects with airflow limitation indicative of COPD (113 vs. 120, P = 0.324; n = 242). COPD is a frequent and underdiagnosed comorbidity in patients on chronic hemodialysis. Spirometry should be considered in all patients on dialysis in order to address dyspnea adequately. Hemodialysis induced a small fall in mean FEV1 and FVC, which was more pronounced in patients with little or no fluid removal, but the FEV1/FVC ratio and the number of subjects with airflow limitation indicative of COPD were not affected by dialysis. 相似文献
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Louis Kruh 《Cryptologia》2013,37(2):78-82
The third Britisher who, in addition to Alastair Denniston and Dillwyn Knox, met the Poles near Pyry in 1939 to to receive a copy of the Enigma machine has been wrongly identified as Stewart Menzies, head of the British foreign Intelligence service. In fact he was Humphrey Sandwith, head of the Admiralty's interception and direction-finding service. 相似文献