Messen in rauher Umgebung

In der Schüttgutverarbeitenden Industrie werden die Rohstoffe in der Regel vor der Verarbeitung oder als Fertigprodukt in Silos gelagert. Eine fortlaufende Erfassung der Bestände, eine kontinuierliche Füllstandmessung, ist aus logistischen oder produktionstechnischen Gründen erforderlich.

Read more

ForumMIRO 2013

Vom 6. bis zum 8. November 2013 fand im Eurogress Aachen das fünfte ForumMIRO statt. Die Veranstaltung hat einen in jeder Hinsicht außerordentlichen Ruf in der Fachwelt, und ist dank ihrer hohen inhaltlichen Qualität zur bedeutendsten Kongress- und Ausstellungsveranstaltung der deutschen Gesteinsindustrie avanciert.

Read more

Technikum für Schüttgüter

Seit dem 2. April 2013 verfügt das Unternehmen KREISEL GmbH & Co. KG in Krauschwitz über ein eigenes Technikum und bietet damit ideale Bedingungen, die Auslegungsparameter für die Dimensionierung von pneumatischen Förderanlagen sowie die KREISEL eigenen Komponenten, z.B. Filter, KREISEL Dom Ventile oder Keramik-Zelleradschleusen, zu testen.

Read more

Konstruktiver Explosionsschutz

Die Verarbeitung explosionsfähiger Stäube birgt für Personen und Anlagen in der Schüttgutindustrie ein hohes Risiko. Vor diesem Hintergrund wurde in Deutschland die EU-Richtlinie 99/92/EG (ATEX 137, Betriebssicherheitsverordnung) umgesetzt: Diese definiert Mindestvorschriften zur Verbesserung des Gesundheitsschutzes und der Sicherheit der Arbeitnehmer, die durch eine explosionsfähige Atmosphäre gefährdet sind.

Read more

Mitgliederversammlung 2013 DSIV e.V

Erfolgreiche POWTECH für den DSIV e.V.

Junger Verband, erfahrene Kräfte: Kein Wunder also, dass auch bei der 2. Versammlung des Deutschen Schüttgut-Industrie Verbands (DSIV), diesmal auf der POWTECH 2013, das Interesse der Mitglieder groß und ihr Engagement außerordentlich war. Den Start besorgte der Vorsitzende Stefan Penno mit einem zügigen Vortrag der Regularien.

Read more

Geostatistics for the Next Century?

An International Forum to honour Professor Dr Michel David for his contribution to geostatistics? What’s this world coming to! I read David’s 1977 Geostatistical Ore Reserve Estimation after Elsevier had published it. David’s work has never been a part of any ISO Standard. Yet, ISO Standards have been my bread and butter since I joined ISO/TC102 – Iron Ore in 1974. ASTM’s Board of Directors has awarded me in 1995 for continuous membership of Section 5 Petroleum Products, Lubricants and Fossil Fuels.

Tracing geostatistics to its roots in applied statistics is simple comme bonjour. It’s about as simple as to create spatial dependence where it does not exist! What a pity that interpolation between measured values does not give unbiased precision estimates for grades and contents! Stripping variances off distance-weighted averages AKA kriged estimates has made no sense at all in my work. Professor Matheron in 1970 put in place Brownian motion along a straight line! Good grief! Professor Dr Michel David showed in Fig. 203 on page 286 a set of measured values with df=8 degrees of freedom. He pointed out that his 1977 textbook is not for professional statisticians. I do agree!

Dr R A Blais and Dr G Perrault were not surprised that distance-weighted averages had metamorphosed into kriged estimates. The National Research Council of Canada kept Grant NRC7035 coming in convenient increments. Professor Dr Michel David’s 1988 Handbook of Applied Advanced Geostatistical Ore Reserve Estimation added another 216 rambling pages.

Geostatistics converted Bre-X’s bogus grades and Busang’s barren rock into a massive phantom gold resource. Applied statistics proved the intrinsic variance of Bre-X’s gold to be statistically identical to zero. Are geostatistocrats still marching in place? It would have made sense to unravel what was wrong with Bre-X in 1993 rather than stringing Markov chains in 2014!

All events at Montreal, Quebec, Canada took place on June 3-5, 1993. Practitioners of geostatistics had flocked from far and wide to praise Professor Dr Michel David. He had completed in 1977 what was called Geostatistical Ore Reserve Estimation. Scores of geostatisticians were driven to assume spatial dependence between measured values in ordered sets. The more so since a few samples selected at different positions in a finite sample space do give infinite sets of distance-weighted averages AKA kriged estimates.

Professor Matheron’s new science of geostatistics was based on selecting a subset of any infinite set of kriged estimates, and on smoothing pseudo kriging variances to perfection. Assume spatial dependence between measured values, interpolate by kriging, smooth a lot, think a little, and rig the rules of mathematical statistics with impunity. Common sense dictates that testing for spatial dependence between measured values in ordered sets ought to precede interpolation by kriging. The more so since the variance has been stripped off each and every distance-weighted average AKA kriged estimate. Why work with an ordered set of kriged estimates and derive a semi-variogram? Why not work with an ordered set of measured values and derive a true sampling variogram? David’s 1977 Geostatistical Ore Reserve Estimation is the worst textbook on this planet. Until David’s 1988 Handbook of Applied Advanced Geostatistical Ore Reserve Estimation came along and made it worse!

It’s simple to create spatial dependence where it does not exist. What a pity that interpolation between measured values does not give unbiased precision estimates! Stripping variances off distance-weighted averages AKA kriged estimates made no sense at all in my work. Professor Matheron in 1970 put in place Brownian motion along a straight line! Good grief! Professor Dr Michel David showed in Fig. 203 on page 286 a set of measured values with df=8 degrees of freedom. He pointed out that his 1977 textbook is not for professional statisticians. I do agree!

Dr R A Blais and Dr G Perrault were not at all surprised that distance-weighted averages had metamorphosed into kriged estimates. The National Research Council of Canada kept Grant NRC7035 coming in convenient increments. Professor Dr Michel David’s 1988 Handbook of Applied Advanced Geostatistical Ore Reserve Estimation added another 216 rambling pages.

Here’s a take on his 1988 Handbook of Advanced Geostatistical Ore Reserve Estimation. It was geostatistics that converted Bre-X’s bogus grades and Busang’s barren rock into a massive phantom gold resource. Applied statistics proved the intrinsic variance of Bre-X’s gold to be statistically identical to zero. How many geostatistocrats are still marching in place? It would have made more sense to unravel what was wrong with Bre-X in 1993 than stringing Markov chains in 2014!

All events at Montreal, Quebec, Canada took place on June 3-5, 1993. Practitioners of geostatistics had flocked from far and wide to praise Professor Dr Michel David. He had completed in 1977 what was called Geostatistical Ore Reserve Estimation. Scores of geostatisticians were driven to assume spatial dependence between measured values in ordered sets. The more so since a few samples selected at different positions in a finite sample space do give infinite sets of distance-weighted averages AKA kriged estimates.

Professor Matheron’s new science of geostatistics was based on selecting a subset of some infinite set of kriged estimates, and on smoothing pseudo kriging variances to perfection. Assume spatial dependence between measured values, interpolate by kriging, smooth a lot, think a little, and rig the rules of mathematical statistics with impunity. Common sense dictates that testing for spatial dependence between measured values in an ordered set ought to precede interpolation by kriging. The more so since the variance has been stripped off each and every distance-weighted average AKA kriged estimate. Why work with ordered sets of kriged estimates and derive semi-variograms? Why not work with ordered sets of measured values and derive real sampling variograms? Why not count degrees of freedom of ordered sets? David’s 1977 Geostatistical Ore Reserve Estimation was the worst textbook on this planet. Until his 1988 Handbook of Applied Advanced Geostatistical Ore Reserve Estimation came along and made a worse read!

A weblog for the worldwide powder and bulk solids handling and processing community.

Single Sign On provided by vBSSO