Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigation of the performance of photovoltaics installed close to
  river   The effect of temperature and relative humidity on photovoltaics close to
river in calabar was studied. A KT-908 precision digital hygrometer and
thermometer, and a M890C+ digital multimeter were used in the process. Results
obtained shows that the effect of relative humidity on current, power and
efficiency are the same. The results also show that voltage remains fairly
stable between 65% to 75% relative humidity. While efficiency increases with
temperature up to the maximum operating temperature of the photovoltaic module
before starting to decrease. Peak in efficiency was observed at a relative
humidity value of 65% and module temperature of about 470C at noon.

20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph