Learning to Teach from Within a Christian Perspective

Dr. John H. Kok presented this paper at the IAPCHE conference at Hilltop University in Mikar, Nigeria, in 1999

Contemporary Environmental Ethics: A Tempest in a Teapot

This feature article is based on a paper given for the 1993 Fall Faculty Lecture Series at Dordt College

Souls Seeking Leadership

This feature article is based on a paper given during the 1991 Spring Ministers\u27 Conference at Dordt College under the theme To Belong Body and Soul...

To Have and To Hold: Peculiar Grounds for Cultural Engagements and Civil Disagreements

The article below, written by Dr. John Kok, is the expanded and revised version of his response to Dr. Richard Mouw\u27s presentation (on common grace) at a public forum in connection with Pastors\u27 Day, held at Dordt College on September 9, 2002

Serious or Playful: A Meditation by Dirk H. Th. Vollenhoven (1892-1978)

This meditation is a translation, by John H. Kok, of D. H. Theodoor Vollenhoven\u27s Spel of ernst? published in the Gereformeerde Kerkbod (11, 18, 25 November and 2 December 1923).—“Wat is Christelijke filosofie?”—as Professor of Christian Philosophy at the Vrije University, Amsterdam. A slightly revised rendition, translated from the Dutch by Dr. Kok, was published in Stuwdam (16 January 1937) under the title Groote kinderen

Field trials and test results of portable DVB-T systems with transmit delay diversity

This paper describes work carried out by Brunel University and Broadreach Systems (UK) to quantify the advantages that can be achieved if Transmit Diversity is applied to systems employing the DVB standard. The techniques investigated can be applied to standard receiver equipment without modification. An extensive and carefully planned field trial was performed during the winter of 2007/2008 in Uxbridge (UK) to validate predictions from theoretical modeling and laboratory simulations. The transmissions were performed in the 730 MHz frequency band with a DVB-T transmitter and a mean power of 18.4dBW. Transmit delay diversity has been observed to deliver significant reception improvement in automotive and indoor- non line of sight situations

Relationships of Biomass-Burning Aerosols to Ice in Orographic Wave Clouds

Ice concentrations in orographic wave clouds at temperatures between −24° and −29°C were shown to be related to aerosol characteristics in nearby clear air during five research flights over the Rocky Mountains. When clouds with influence from colder temperatures were excluded from the dataset, mean ice nuclei and cloud ice number concentrations were very low, on the order of 1–5 L^(−1). In this environment, ice number concentrations were found to be significantly correlated with the number concentration of larger particles, those larger than both 0.1- and 0.5-μm diameter. A variety of complementary techniques was used to measure aerosol size distributions and chemical composition. Strong correlations were also observed between ice concentrations and the number concentrations of soot and biomass-burning aerosols. Ice nuclei concentrations directly measured in biomass-burning plumes were the highest detected during the project. Taken together, this evidence indicates a potential role for biomass-burning aerosols in ice formation, particularly in regions with relatively low concentrations of other ice nucleating aerosols