Xem 1-10 trên 10 kết quả Degradation phenomena
  • This book presents a critical review of various chromatography techniques for a limited number of processes. Most techniques are illustrated by examples. The processes described are necessarily limited to those which appear to the authors to have the greatest validity and practical use. Wherever possible, we have included recommendations delineating the best techniques for analyzing each sample. Recommended techniques are often illustrated by detailed examples.

    pdf140p qsczaxewd 25-09-2012 24 12   Download

  • Ionic methods of separation have been used since the industrial revolution in Europe to reduce hardness of water. In the mid-nineteenth century, British researchers treated various clays with ammonium sulfate or carbonate in solution to release calcium. In the early twentieth century, zeolite columns were used to remove interfering calcium and magnesium ions from solutions to permit determination of sulfate. Ionic separation procedures were used in the Manhattan project to purify and concentrate radioactive materials needed to make atom bombs.

    pdf455p bachduong1311 12-12-2012 28 4   Download

  • In this chapter, students will be able to understand: What are the biochemical pathways that form ammonium from inorganic nitrogen compounds prevalent in the inanimate environment? How is ammonium incorporated into organic compounds? How are amino acids synthesized and degraded?

    ppt75p tangtuy15 30-06-2016 10 2   Download

  • Impoverishing the local resource base can impoverish wider areas: deforestation by highland farmers causes flooding on lowland farms; factory pollution robs local fishermen of their catch. Such grim local cycles now operate nationally and regionally. Dryland degradation sends environmental refugees in their millions across national borders. Deforestation in Latin America and Asia is causing more floods, and more destructive floods, in downhill, downstream nations. Acid precipitation and nuclear fallout have spread across the borders of Europe.

    pdf79p yeurauxanh88 28-09-2012 23 7   Download

  • As a country which contains significant concentrations of population in fragile mountain eco- systems, expanding arid zones, various regions which are subject to periodic flooding, increasing deforestation and environmental degradation and high levels of poverty, Bolivia is particularly vulnerable to climate change. Its damaging impact can be seen in a range of phenomena such as increasingly severe and frequent flooding and landslides and the accelerated melting of tropical glaciers.

    pdf1141p doiroimavanchuadc 19-02-2013 19 3   Download

  • Clairvoyance means literally nothing more than "clear-seeing," and it is a word which has been sorely misused, and even degraded so far as to be employed to describe the trickery of a mountebank in a variety show. Even in its more restricted sense it covers a wide range of phenomena, differing so greatly in character that it is not easy to give a definition of the word which shall be at once succinct and accurate. It has been called "spiritual vision," but no rendering could well be more misleading than that, for in the vast majority of cases there is no faculty connected with it...

    pdf83p chonguoinoiay 26-02-2013 14 3   Download

  • In this section we define the problem we address, state our assumptions, and describe our threat model. We address the problem of designing and implement- ing malicious processors that carry out high-level at- tacks. In this paper we focus on an attacker that adds additional circuits to carry out the attack. We consider analog circuit perturbations (both timing and power), as well as discrete perturbations. We do not consider at- tacks where the gate-level design is unmodified and the attacker uses physical phenomena (e.g.

    pdf10p nhacsihuytuan 06-04-2013 37 3   Download

  • Biologicalmicroorganismsare important tomaintainaproductive soil.Energy cropsusually supportamorediversemicrobialpopulationthantypicalagriculturalrowcrops.Somestudies suggestthatenergycropschangetheagriculturallandbiotatotheonesquitesimilartoforest environment.Increasedsoilcarbon,moreconsistentsoilmoisture,lowersoiltemperature(due topropercover)helpintherestorationoftheagriculturallandbiota.

    pdf20p loixinloi 08-05-2013 10 3   Download

  • Virtually all cells are capable of synthesizing purine and pyrimidine nucleotides. These compounds then serve as essential intermediates in metabolism and as the building blocks for DNA and RNA synthesis. In this chapter you will learn: How do cells synthesize purines and pyrimidines?

    ppt53p tangtuy15 30-06-2016 9 2   Download

  • Ribosomes synthesize proteins by reading the nucleotide sequence of mRNAs and polymerizing amino acids in an N→C direction. In this chapter, the following content will be discussed: How is the nucleotide sequence of an mRNA molecule translated into the amino acid sequence of a protein molecule?

    ppt64p tangtuy15 30-06-2016 11 2   Download

Đồng bộ tài khoản