射阳港进港航道施工期间安全保障措施

受自然环境和水文地质条件的影响,运营过程中的航道每年都会产生回淤现象,当回淤程度影响通航安全或航道正常通航时,必须进行清淤。为减小营运损失,往往通过边通航边施工的方式进行。施工期间,疏浚挖泥船需占用航道半幅通航水域,减小航道的有效通航宽度,使得航道交通密度变大,且工程船舶进出施工水域会与航行船舶发生交会,绞吸式挖泥船需铺设管线作业,施工侧作业期间禁止通航,迫使渔船和小型船舶改变习惯航路,对营运航道的通航安全带来较大的隐患,在能见度较低的情况下,驾引人员瞭望视野受到一定的限制,有限的通航空间使对避让和船舶机动性能均受到限制,文章通过射阳港进港航道施工实践,提出了疏浚施工过程中保障航道通行的一些措施,通过采取相应措施,保障了施工期间航道的安全正常运营,为类似施工起到一定的借鉴作用。     

Preliminary characteristic of alginate,heparin-chitosan-alginate,heparin microencapsulated hepatocytes system

Alginate, low mole mass heparin-chitosan-alginate, low mole mass heparin microcapsules (ALCAL) with good mechanical stability were made from the high voltage pulsing microcapsule shaping device. ALCAL was made of low-mole-mass heparin (LMWH), alginate (ALG) and chitosan (CS) by supramolecular layer upon layer self-assembled technique. It was found from the microscopic observation that the microcapsules had smooth surface and a porous structure with interconnected pores. The results of the permeability experiment of microcapsules using fluorescein isothiocyanate-bovine serum albumin (FITC-BSA) and fluorescein isothiocyanate-immunoglobulin G (FITC-IgG) showed that the ALCAL membrane could provide cell immuno-isolation; meanwhile, the ALCAL membrane had good biocompatibility. The potential of ALCAL microcapsules for the encapsulation of liver cells had been investigated and showed that the ALCAL membrane supports the survival, proliferation and protein secretion on encapsulating hepatocytes. The ALCAL microcapsule had several advantages compared to more widely used alginate-chitosan-alginate (ACA) microcapsules for the application of cell therapy.