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    <element id="ACON_IssuanceOfCommonSharesAtthemarketOfferingShares" name="IssuanceOfCommonSharesAtthemarketOfferingShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCommonSharesAtthemarketOffering" name="IssuanceOfCommonSharesAtthemarketOffering" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfBseriesPreferredStockDebtForEquityExchangeShares" name="IssuanceOfBseriesPreferredStockDebtForEquityExchangeShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfBseriesPreferredStockDebtForEquityExchange" name="IssuanceOfBseriesPreferredStockDebtForEquityExchange" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCommonSharesDebtForEquityExchangeShares" name="IssuanceOfCommonSharesDebtForEquityExchangeShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCommonSharesDebtForEquityExchange" name="IssuanceOfCommonSharesDebtForEquityExchange" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfRegaWarrantsShares" name="IssuanceOfRegaWarrantsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfRegaWarrants" name="IssuanceOfRegaWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CapitalizationOfBseriesPreferredStockDividendsShares" name="CapitalizationOfBseriesPreferredStockDividendsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CapitalizationOfBseriesPreferredStockDividends" name="CapitalizationOfBseriesPreferredStockDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCseriesPreferredStockShares" name="IssuanceOfCseriesPreferredStockShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCseriesPreferredStock" name="IssuanceOfCseriesPreferredStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCseriesWarrantsShares" name="IssuanceOfCseriesWarrantsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCseriesWarrants" name="IssuanceOfCseriesWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ConversionOfCseriesPreferredToCommonStockShares" name="ConversionOfCseriesPreferredToCommonStockShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ConversionOfCseriesPreferredToCommonStock" name="ConversionOfCseriesPreferredToCommonStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCommitmentSharesNoteFinancingShares" name="IssuanceOfCommitmentSharesNoteFinancingShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCommitmentSharesNoteFinancing" name="IssuanceOfCommitmentSharesNoteFinancing" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CommitmentShareForwardElementEquityLineShares" name="CommitmentShareForwardElementEquityLineShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CommitmentShareForwardElementEquityLine" name="CommitmentShareForwardElementEquityLine" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_PreferredStockIssuanceCostsShares" name="PreferredStockIssuanceCostsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_PreferredStockIssuanceCosts" name="PreferredStockIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CommonStockIssuanceCostsShares" name="CommonStockIssuanceCostsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CommonStockIssuanceCosts" name="CommonStockIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CashlessExerciseOfPrefundedWarrantsShares" name="CashlessExerciseOfPrefundedWarrantsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CashlessExerciseOfPrefundedWarrants" name="CashlessExerciseOfPrefundedWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_RoundupConversionRelatedToReverseStockSplitsShares" name="RoundupConversionRelatedToReverseStockSplitsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_RoundupConversionRelatedToReverseStockSplits" name="RoundupConversionRelatedToReverseStockSplits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_RegisteredDirectOfferingsOfCommonStockShares" name="RegisteredDirectOfferingsOfCommonStockShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_RegisteredDirectOfferingsOfCommonStock" name="RegisteredDirectOfferingsOfCommonStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_PublicOfferingOfCommonStockAndWarrantsShares" name="PublicOfferingOfCommonStockAndWarrantsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_PublicOfferingOfCommonStockAndWarrantsValue" name="PublicOfferingOfCommonStockAndWarrantsValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ConversionOfCseriesPreferredStockToCommonStockShares" name="ConversionOfCseriesPreferredStockToCommonStockShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ExerciseOfCseriesWarrantsShares" name="ExerciseOfCseriesWarrantsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ExerciseOfCseriesWarrants" name="ExerciseOfCseriesWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ProceedsFromDirectOfferingOfPrefundedWarrantsShares" name="ProceedsFromDirectOfferingOfPrefundedWarrantsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ProceedsFromDirectOfferingOfPrefundedWarrants" name="ProceedsFromDirectOfferingOfPrefundedWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_WarrantAmendment" name="WarrantAmendment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_AlternativeCashlessExerciseOfBWarrantsShares" name="AlternativeCashlessExerciseOfBWarrantsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_AlternativeCashlessExerciseOfBWarrants" name="AlternativeCashlessExerciseOfBWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_NoncashInterestRelatedToBridgeFunding" name="NoncashInterestRelatedToBridgeFunding" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_NoncashExpensesRelatedToEquityLineAgreement" name="NoncashExpensesRelatedToEquityLineAgreement" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ProceedsFromIssuanceOrSaleOfCommonStockAndWarrants" name="ProceedsFromIssuanceOrSaleOfCommonStockAndWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ProceedsFromSaleOfCommonStockAndWarrantsAtm" name="ProceedsFromSaleOfCommonStockAndWarrantsAtm" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ProceedsFromCommonStockAndWarrantRegaOffering" name="ProceedsFromCommonStockAndWarrantRegaOffering" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_EquityLineIssuanceCosts" name="EquityLineIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_PreferredStockCashIssuanceCosts" name="PreferredStockCashIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CapitalizationOfSeriesBPreferredStockDividends" name="CapitalizationOfSeriesBPreferredStockDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CapitalizationOfSeriesCPreferredStockDividends" name="CapitalizationOfSeriesCPreferredStockDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ConversionOfSeriesCPreferredStockToCommonStock" name="ConversionOfSeriesCPreferredStockToCommonStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_CashlessExerciseOfBWarrantsToCommonStock" name="CashlessExerciseOfBWarrantsToCommonStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_DividendsAccruedOnPreferredShares" name="DividendsAccruedOnPreferredShares" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ExchangeOfIndebtednessForCommonShares" name="ExchangeOfIndebtednessForCommonShares" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ExchangeOfIndebtednessForPreferredShares" name="ExchangeOfIndebtednessForPreferredShares" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ConversionOfPreferredStockToCommonStock" name="ConversionOfPreferredStockToCommonStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCommonSharesRelatedToRestrictedStockUnits" name="IssuanceOfCommonSharesRelatedToRestrictedStockUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_IssuanceOfCommitmentSharesRelatedToBridgeFunding" name="IssuanceOfCommitmentSharesRelatedToBridgeFunding" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_DisclosureLeasesAbstract" name="DisclosureLeasesAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_GeographicLocationsAndSegmentsPolicyTextBlock" name="GeographicLocationsAndSegmentsPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_SalesAndMarketingExpensesPolicyTextBlock" name="SalesAndMarketingExpensesPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_LiquidityCapitalResourcesAndGoingConcernPolicyTextBlock" name="LiquidityCapitalResourcesAndGoingConcernPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_EmergingGrowthCompanyStatusPolicyTextBlock" name="EmergingGrowthCompanyStatusPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ScheduleOfChangesToEquityStatementTableTextBlock" name="ScheduleOfChangesToEquityStatementTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ScheduleOfSharesAndLossPerShareInformationTableTextBlock" name="ScheduleOfSharesAndLossPerShareInformationTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_ScheduleOfFutureDepreciationOfPropertyAndEquipmentMaturityTableTextBlock" name="ScheduleOfFutureDepreciationOfPropertyAndEquipmentMaturityTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_FloorFinancingPrice" name="FloorFinancingPrice" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_DisclosureTable" name="DisclosureTable" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" />
    <element id="ACON_DisclosureLineElements" name="DisclosureLineElements" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_FutureDepreciationOfPropertyAndEquipmentInNextTweleveMonths" name="FutureDepreciationOfPropertyAndEquipmentInNextTweleveMonths" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_FutureDepreciationOfPropertyAndEquipmentInYearTwo" name="FutureDepreciationOfPropertyAndEquipmentInYearTwo" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_FutureDepreciationOfPropertyAndEquipmentInYearThree" name="FutureDepreciationOfPropertyAndEquipmentInYearThree" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_FutureDepreciationOfPropertyAndEquipmentInYearFour" name="FutureDepreciationOfPropertyAndEquipmentInYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_FutureDepreciationOfPropertyAndEquipmentInYearFive" name="FutureDepreciationOfPropertyAndEquipmentInYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_MinimumAnnualRoyaltyPayment" name="MinimumAnnualRoyaltyPayment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_StockIssueDate" name="StockIssueDate" nillable="true" xbrli:periodType="duration" type="xbrli:dateItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_UnitDescription" name="UnitDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_WarrantsIssuedShares" name="WarrantsIssuedShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_WarrantsExercised" name="WarrantsExercised" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="ACON_WeightedAverageSharesOutstandingUsedToComputeBasicAndDilutiveLossPerShare" name="WeightedAverageSharesOutstandingUsedToComputeBasicAndDilutiveLossPerShare" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
</schema>
