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  <xsd:element id="acfn_WarrantsForfeitedInCashlessExercise" name="WarrantsForfeitedInCashlessExercise" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="acfn_WarrantsForfeitedOrExpired" name="WarrantsForfeitedOrExpired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="acfn_WarrantsIssuedInCapitalRaise" name="WarrantsIssuedInCapitalRaise" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="acfn_WeightedAverageExercisePriceCashlessExercise" name="WeightedAverageExercisePriceCashlessExercise" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="acfn_WeightedAverageExercisePriceExercisedOptions" name="WeightedAverageExercisePriceExercisedOptions" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="acfn_WeightedAverageExercisePriceOfWarrantsExercised" name="WeightedAverageExercisePriceOfWarrantsExercised" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="acfn_Weightedaverageexercisepriceofoptionsorwarrantsgranted" name="Weightedaverageexercisepriceofoptionsorwarrantsgranted" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
</xsd:schema>
