Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Peltier ac calorimeter   A new ac calorimeter, utilizing the Peltier effect of a thermocouple junction
as an ac power source, is described. This Peltier ac calorimeter allows to
measure the absolute value of heat capacity of small solid samples with
sub-milligrams of mass. The calorimeter can also be used as a dynamic one with
a dynamic range of several decades at low frequencies.

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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc