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Design and experiment of cone disk centrifugal shellfish seeding device
No full textThis paper designed a centrifugal shellfish seeding device with a conical disc
structure to improve the seeding efficiency and uniformity of the centrifugal
shellfish seeding device. The dynamic model of the shellfish seedling moving on
the conical disk is established, and the main parameters affecting the shellfish
seedling?s movement characteristics are determined as the cone angle of the
impeller, the speed of the impeller, and the offset angle of the blade. Using the
EDEM software and the shellfish seedlings blanking rate as the influencing factors,
a single factor simulation test was performed. The research found that the variation
trend of shellfish seedlings distribution in a single statistical area gradually
decreased along the horizontal direction of both sides, with the origin being the
center of the seedling sowing device. Test orthogonal rotation simulations using
the variation coefficient of seedlings distribution uniformity and the effective job
width as evaluation indicators. Use Design Expert software to optimize the
structure of the seedling sowing device based on the test results, and determine
the optimal structure with the maximum width and the minimum variation
coefficient as constraints: the impeller cone angle is 7.72?, and the blade offset
angle is -0.9?. Use the above-mentioned seeding device for simulation and actual
seeding testing. The simulation results show that when the impeller speed is 750r/
min and the blanking rate is 0.65kg/s, the variation coefficient of seedlings
distribution uniformity and the effective job width are 12.84% and 24.98m,
respectively, while the actual test results are 13.77% and 23.25m, respectively.
The object of the seeding performance test was commonly used size shellfish
seedlings of the Philippines clam. The results showed that the impeller speed,
blanking rate, quadratic term of shellfish seedling size, quadratic term of blanking
rate, and interactive term of impeller speed and blanking rate had significant effects
on the variation coefficient of the distribution uniformity of shellfish seedlings
(P<0.01). Shellfish seedling size, impeller speed, and interactive term of impeller
speed and blanking rate all had a significant impact on job width (P<0.01). The
results of this study provide a reference for the mechanized design of
shellfish seeding
Identifying priority areas for improvement in Chilean fisheries
No full textChile is amidst an unprecedented legal and institutional change since the
restoration of democracy at the end of the 80?s, which is expected to affect
fisheries governance. A global lead in marine resource landings, Chile
implemented significant fisheries management reforms in the past decade. Yet,
Chilean fisheries still face sustainability challenges. In this paper we reflect on the
results of a survey carried out in 2019-2020 with key informants aimed to identify
fisheries policy reform priorities in country. Addressing Illegal, unreported, and
unregulated fishing; Developing a priority national research agenda to improve
fisheries management in Chile; Addressing the lack of legitimacy of the fisheries
law; Developing a new national fisheries policy; and Update the Artisanal Fisheries
Registry were identified as priority topics by respondents
Teori lanjutan tingkah laku terancang: faktor-faktor yang mempengaruhi hajat pelancong untuk melawat semula ke Laguna Redang
No full textINVESTIGATION ON THE STRUCTURAL, MORPHOLOGY AND ELECTROCHEMICAL PERFORMANCES OF Mn-BASED OXIDE (Mn2O3, Mn3O4) WITH HETEROATOM DOPED-REDUCED GRAPHENE OXIDE (rGO) AEROGELS AS AN ANODE FOR SODIUM-ION BATTERIES
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