计算机多元统计在渔船主要参数分析中的应用

本文用多元统计方法在计算机上对我国目前广泛使用的36种漁船作了对应分析和动态聚类分析。其中9个指标为CB、Cp、Cw、L/B、L/D、B/D、B/T、VF/LBD和P/△。漁船被聚成三类。其中参数P/△、VF/LBD对聚类起最大作用。     

＋20号农用柴油在渔船上使用的研究

发动机对燃油性能的差别一般是敏感的，故大多数发动机设计时已考虑用规定品种的燃油。喷射设备的选择和工作也取决于燃油的物理和化学性能。     

基于MapX的渔船导航系统的研究

以VB为开发平台,通过串口通信控件(MSComm32.ocx)接收GPS定位信息,采用MapX控件进行二次开发,完成了渔船导航智能模块的开发,实现了在动态图层上实时记录并表达船只位置、速度、航向、距目标距离等航行要素,以及以动态数组存储和回放渔船航行轨迹。为渔船快速到达指定位置,顺利返航、精确估算扫捕面积及作业信息的后期统计分析提供便利。     

人为因素对渔船航行安全的影响

对近年来发生的渔船事故进行分析,找出人为因素在导致渔船发生事故中的一般规律,探讨人为失误的机理,提出减少人为失误、提高渔船航行安全的一些措施,以达到预防或减少渔船事故发生的目的.     

拖网作业对渔船性能的影响

通过分析拖网渔船在作业时所受的阻力 ,探讨渔具阻力对拖网渔船的稳性、横倾角和吃水的影响。结果表明 ,拖网渔具阻力的作用使渔船的初稳性高度降低 ,产生可达 4°的横倾角和 0 .7m尾倾。并据此对拖网渔船的安全作业进行了分析     

人为因素对渔船航行安全的影响

对近年来发生的渔船事故进行分析，找出了人为因素在导致渔船发生事故中的一般规律，探讨了为失误的机理，提出减少人为失误区、提高渔船航行安全的一些措施，以达到预防或减少渔船事故发生的目的。     

中国南海中小渔船动力装置的几点论证

就２２０～４４１ｋｗ的中小型渔船动力装置选型的历史沿革，从船、机、桨匹配理论分析，结合中国南部海区渔民实践造就已使用的情况，论述大家所关心的几个问题。认为：不能只用“单机单桨”一种推进型式；双机双桨能发挥主机功率，合理安排动力装置，安全性及其经济性均有优越之处，适合我国南海大多数渔区渔港实际情况。     

渔船螺旋桨图谱设计中的计算机辅助计算

介绍了在IBM PC/XT微机上用BASIC语言编制的渔船螺旋桨图谱设计中的数值计算软件,并辅以汉字系统,具有满足工程设计要求及人机对话功能,提高了计算精度与计算速度。适合于渔船螺旋桨设计中应用。     

Application of Lactic Acid Bacteria (LAB) in Freshness Keeping of Tilapia Fillets as Sashimi

Aquatic products are extremely perishable food commodities. Developing methods to keep the freshness of fish represents a major task of the fishery processing industry. Application of Lactic Acid Bacteria(LAB) as food preservative is a novel approach. In the present study, the possibility of using lactic acid bacteria in freshness keeping of tilapia fillets as sashimi was examined. Fish fillets were dipped in Lactobacillus plantarum 1.19(obtained from China General Microbiological Culture Collection Center) suspension as LAB-treated group. Changes in K-value, APC, sensory properties and microbial flora were analyzed. Results showed that LAB treatment slowed the increase of K-value and APC in the earlier storage, and caused a smooth decrease in sensory score. Gram-negative bacteria dominated during refrigerated storage, with Pseudomonas and Aeromonas being relatively abundant. Lactobacillus plantarum 1.19 had no obvious inhibitory effect against these Gram-negatives. However, Lactobacillus plantarum 1.19 changed the composition of Gram-positive bacteria. No Micrococcus were detected and the proportion of Staphylococcus decreased in the spoiled LAB-treated samples. The period that tilapia fillets could be used as sashimi material extended from 24 h to 48 h after LAB treatment. The potential of using LAB in sashimi processing was confirmed.     

Development,Characterization and Application of a Three-Layer Intelligent pH-Sensing Indicator Based on Bromocresol Green(BCG) for Monitoring Fish Freshness

As a novel food quality monitoring technology, intelligent freshness indicator has received wide attention in recent years.However, its poor safety and stability are the main problems hindering its practical application. Hence a new pH-sensing indicator based on bromocresol green(BCG) was developed in this study for nondestructive and real-time monitoring the freshness of marine fishes. The indicator was designed with a three-layer structure, using the polytetrafluoroethylene(PTFE) membrane with...     

测量鱼鲜度的三甲胺MIS结构的敏感性与机理

以ＴｉＯ２为材料制作的Ａｌ／ＴｉＯ２／Ｓｉ　ＭＩＳ结构对与鱼鲜度有关的三甲胺气体有良好的响应。实验表明：当三甲胺体积分数从０～１０３×１０－６变化时,在１ＭＨ的测试频率下,样品的电容值改变了２５０％;在３Ｖ的偏压下,电流变化了４５０％。鲜鱼死后在２５ｈ内,在较高温度下样品的（Ｃ－ｔ）和（Ｉ－ｔ）关系响应敏感。并通过分析ＴｉＯ２膜各组分的介电常数,解释了样品的电容随体积分数变化的机理。提出了吸附模型,鉴于化学吸附产生的正电荷对界面势垒和电场的影响,结合Ｆｏｗｌｅｒ－Ｎｏｒｈｅｉｍ（Ｆ－Ｎ）隧道穿透机构对电流一体积分数（Ｉ—Ｄ）关系进行解释。     

利用小杂鱼、低值鱼提取浓缩鱼蛋白

以小杂鱼、低值鱼为原料,采用溶剂萃取法研究了溶剂种类、温度、时间和溶剂量对鱼蛋白提取过程中脱水、脱脂、脱色和脱腥的影响,筛选出提取浓缩鱼蛋白的最佳工艺条件。结果表明,在该工艺条件下制得的浓缩鱼蛋白,其蛋白质含量高达９２．２８％,脂肪含量仅为０．０９２％。     

鱼类吹风冻结保鲜的组织变化研究

利用电子显微镜观察石斑鱼冻结后的组织变化情况,研究现行吹风冻结工艺的保鲜效果。结果表明,冻结时间10h的石斑鱼组织结构中出现肌原纤维以及蛋白质受到破坏的现象,从而使其风味、营养受到严重影响。因此,有必要提高现行的吹风冻结速度。     

我国集装箱运价保值的市场架构

集装箱运价的波动使得探讨运费保值的方法成为运输各方关注的重要问题。针对国际集装箱运输市场的特点,并借鉴国际上创设的多种运费衍生市场的经验,提出了集装箱运费保值市场的双层构架：创设以做市商为中心的、零售性质的远期运费合同市场,以利于中小型外贸公司、货代公司和船公司规避运价的不确定性,并建立集装箱远期运价协议市场,以便做市商、大货主和大船运公司在衍生市场进行运费保值。     

A New Molecular Label Applied to the Study of the Yellow Sea Green Tide

From 2007 to 2017, large-scale green tides occurred every year in the Yellow Sea of China, and Ulva prolifera was the main species leading to the green tide. In this study, we used the Polymerase chain reaction and 3' Rapid-amplification of c DNA ends technique to amplify the nr DNA-LSU and IGS sequences in U. prolifera and one species of Blidingia. These techniques showed 3259 bp of nrD NA-LSU and 3388 bp of IGS in U. prolifera and 3282 bp nr DNA-LSU and 3059 bp IGS in Blidingia sp. At the same time, tandem repeats, short dyads, palindromic and multiple simple repeat sequences in the IGS sequence were found by analyzing the structure of the IGS sequence in U. prolifera and Blidingia sp. G + C contents of the IGS sequence in U. prolifera and Blidingia sp. were 52.42% and 53.09%, respectively. We divided the U. prolifera into two types according to the morphological characteristics. Although the specimens of U. prolifera from the Qingdao coastal area, Jiangsu coastal area and the Yellow Sea have different morphologies, their ITS and IGS sequences are almost identical. Therefore, the main species of the green tides in the Qingdao coastal area, Jiangsu coastal area and the Yellow Sea are the same and have the same origin.     

繁茂膜海绵对工厂化养鱼水体微生物净化作用的初步研究

在大菱鲆(Scophthalmus maximus)工厂化养殖废水中接种繁茂膜海绵(Hymeniacidon perleve),并将繁茂膜海绵与大菱鲆同池养殖,研究繁茂膜海绵对大菱鲆工厂化养鱼水体微生物的净化作用。结果表明,接种量为7 mg/L繁茂膜海绵经过8、16、24、32、40、48 h对养鱼废水中细菌总数的清除率分别为23.18%、47.65%、66.09%、81.57%、93.80%、98.96%;对弧菌的清除率分别为48.61%、56.44%、78.13%、92.88%、97.10%、98.56%;对大肠杆菌的清除率分别为39.51%、41.90%、73.24%、92.29%、97.69%、99.14%,将繁茂膜海绵以7 mg/L的生物量与大菱鲆同池养殖24 h,水体中细菌总数、弧菌和大肠杆菌的清除率分别为61.38%、50.34%、93.47%。     

Experimental Study on the Hydrodynamic Characteristics of a Submersible Fish Cage at Various Depths in Waves

Submersible fish cages can be submerged under the water to mitigate the negative effects that arise from severe sea conditions and improve the growing environment for the farmed fish. Thus they are increasingly applied in offshore aquaculture. To ensure both safety and economic efficiency of submersible fish cages, it is important to determine the optimum submergence depth. In this study, a series of physical model experiments were conducted to investigate the hydrodynamic performance of a submersible fish cage at various submergence depths(1/6, 1/4, 1/3, and 1/2 of the water depth as well as the floating condition for reference) with a model scale of 1:20. The results of the physical model experiment for the different depths were compared to analyze the effects of submergence depths on the mooring line tension and the movement of the floating collar. The results showed that the mooring line tension and the floating collar movement significantly attenuated with increasing submergence depth. However, the attenuation tendency became stable when the fish cage reached a certain depth. According to the results, 1/3 of water depth was determined as the optimal submergence depth of the fish cages. Deeper submergence depths showed no significant advantage from a perspective of the hydrodynamic characteristics of the fish cage. The determination of the optimum submergence depth is beneficial for the structural design and operation safety of submersible net cages.