为了帮助满足日益严格的排放法规,并确保对最新硬件的持续保护,日本对JASO T 903摩托车四冲程汽油发动机机油规格进行了修订。满足新规格油品的首次登记日期定于2023年10月1日,符合目前JASO T 903:2016规格的油品申请可以在2023年9月底...为了帮助满足日益严格的排放法规,并确保对最新硬件的持续保护,日本对JASO T 903摩托车四冲程汽油发动机机油规格进行了修订。满足新规格油品的首次登记日期定于2023年10月1日,符合目前JASO T 903:2016规格的油品申请可以在2023年9月底之前提出,目前的文件数据将在2028年4月30日到期。这次修订中,所涵盖的油品规格和其他性能标准发生了很多变化,并对磷和蒸发损失提出了新的要求。展开更多
The size selectivity and usability of three codends were quantified and compared for the first time in the inshore Northern shrimp(Pandalus borealis)trawl fishery of Iceland using the covered codend method:a conventio...The size selectivity and usability of three codends were quantified and compared for the first time in the inshore Northern shrimp(Pandalus borealis)trawl fishery of Iceland using the covered codend method:a conventional diamond-mesh codend(T0),conventional square-mesh codend(T45),and a 90◦turned mesh codend(T90)constructed of four panels and with shortened lastridge ropes.Fishers,wanting to increase the average-individual size of captured shrimp,had requested the T90 codend to be compared with conventional codends for consideration in the fishery.Results showed that,on average,the T45 and T90 codends had better size selectivity than the T0 codend in terms of releasing individuals smaller than 13 mm carapace length(Minimum References Size;MRS).The T90 codend retained significantly less Northern shrimps between 9 and 19 mm than the T0 codend and between 15 and 19 mm than the T45 codend.No significant difference of size selectivity between T45 and T0 codends was observed.All three codends presented high retention ratios of Northern shrimps above MRS(>63%)for the population encountered.However,the T0 codend was not effective at sorting out small Northern shrimps;at least 86%of Northern shrimps smaller than 13 mm were retained in the T0 codend if encountered.Catches from T45 and T90 codends had a lower proportion of shrimp below MRS.Since discarding of undersized Northern shrimps is prohibited in Iceland and fishers wanted to catch on average larger shrimp,using the novel T90 codend would enable fishers to use their quotas more efficiently.展开更多
文摘为了帮助满足日益严格的排放法规,并确保对最新硬件的持续保护,日本对JASO T 903摩托车四冲程汽油发动机机油规格进行了修订。满足新规格油品的首次登记日期定于2023年10月1日,符合目前JASO T 903:2016规格的油品申请可以在2023年9月底之前提出,目前的文件数据将在2028年4月30日到期。这次修订中,所涵盖的油品规格和其他性能标准发生了很多变化,并对磷和蒸发损失提出了新的要求。
文摘The size selectivity and usability of three codends were quantified and compared for the first time in the inshore Northern shrimp(Pandalus borealis)trawl fishery of Iceland using the covered codend method:a conventional diamond-mesh codend(T0),conventional square-mesh codend(T45),and a 90◦turned mesh codend(T90)constructed of four panels and with shortened lastridge ropes.Fishers,wanting to increase the average-individual size of captured shrimp,had requested the T90 codend to be compared with conventional codends for consideration in the fishery.Results showed that,on average,the T45 and T90 codends had better size selectivity than the T0 codend in terms of releasing individuals smaller than 13 mm carapace length(Minimum References Size;MRS).The T90 codend retained significantly less Northern shrimps between 9 and 19 mm than the T0 codend and between 15 and 19 mm than the T45 codend.No significant difference of size selectivity between T45 and T0 codends was observed.All three codends presented high retention ratios of Northern shrimps above MRS(>63%)for the population encountered.However,the T0 codend was not effective at sorting out small Northern shrimps;at least 86%of Northern shrimps smaller than 13 mm were retained in the T0 codend if encountered.Catches from T45 and T90 codends had a lower proportion of shrimp below MRS.Since discarding of undersized Northern shrimps is prohibited in Iceland and fishers wanted to catch on average larger shrimp,using the novel T90 codend would enable fishers to use their quotas more efficiently.
