摘要：The combat efficiency of mine obstacle is the focus of the present research. Based on the main effects that mine obstacle has on the target warship damage probability such as: features of mines with maneuverability, the success rate of mine-laying, the hit probability, mine reliability and action probability, a calculation model of target warship mine-encounter probability is put forward under the condition that the route selection of target warships accords with even distribution and the course of target warships accords with normal distribution. And a damage probability model of mines with maneuverability to target warships is set up, a simulation way proved the model to be a high practicality.

摘要：A new kinetic spectrophotometric method has been developed for the determination of trace Ni （Ⅱ in natural water. The method is based on the catalytic effect of Ni （Ⅱ） on the oxidation of weak acid brilliant blue dye （RAWL） by KIO4 in acid medium. The concentration of nickel （Ⅱ） can be determined spectrophotometrically by measuring the decrease of absorbance of RAWL at λ = 626 nm using the fix-time method. The influencing factors are investigated by the orthogonal experimental design. The obtained optimum analytical conditions are： pH = 2.00, CRAWL = 5.00×10^-5 mol·L^-1, c KlO4 = 2.00× 10^-5 mol·L^-1, the reaction time t= 10min and the temperature T = 25 ℃. Under the optimum conditions, the developed method allows the measurement of Ni （Ⅱ） in a range of 0 - 40.0ngmL1. The standard deviation of eleven independent measurements of blank reaction is S = 3.08× 10^-3 and the limit of detection is 2.20ng·mL^-1. The relative standard deviations （RSDs） in six replicate determinations of 5 ngmL-1 and 8 ngmL1 Ni （Ⅱ） are 2.87% and 1.11%, respectively. Moreover, the experiments show few cations and anions can interfere with the measurement of Ni （Ⅱ）. The recovery efficiencies of this method are in a range of 97.0%-102.5% in freshwater samples. But there is a decreasing effect, which is about 0.2 times the added Ni （Ⅱ） in seawater medium. After reasonable calibration this processing method is used for the determination of Ni （Ⅱ） in seawater samples successfully. The results show this developed method has high accuracy and precision, high sensitivity, large range of linearity and high speed. The method can, therefore, be employed at room temperature.

摘要：A nonlinear sliding mode adaptive controller for a thin-film diffractive imaging system is designed to achieve accurate pointing direction over the attitude of subarrays in large-diameter mirror *** kinematics and dynamics equations based on error quaternion and angular velocity are derived,and a diffractive thin-film sub-mirror array controller is designed to point ***,the global stability of the controller is proved by the Lyapunov *** the controller can adaptively identify the inertia matrix of each sub-mirror system,it is robust to bounded disturbances and changes in inertia *** the same time,the continuous arctangent function is introduced,which is effectively *** simulation results show that the designed controller can ensure the accurate tracking of the diffractive film in each sub-mirror in the presence of rotational inertia matrix uncertainty and various disturbances.

摘要：This paper uses the component-based technology and the object oriented simulation technology to analyze the UUV navigation and control integration simulation system. We divide the system into components based on its structure, and describe every component using active diagram. By using the component-based technology, the system described here is easier to extended and be reused. At last, it realizes the whole UUV integrated navigation simulation course using the system to validate the availability.

摘要：The most complicated component in cavitating flow and pressure distribution is the flow in the cavity closure line. The cavitating flow and pressure distribution provide critical aspects of flow field details in the region. The integral of pressure results of the hydrodynamic forces, indicate domination in the design of a supercavitating vehicle. An experiment was performed in a water tunnel to investigate the pressure characteristics of the cavity closure region. Ventilation methods were employed to generate artificial cavity, and the ventilation rate was adjusted accordingly to obtain the desired cavity length. An array of pressure transducers was laid down the cavity closure line to capture pressure distribution in this region. The experimental results show that there is a pressure peak in the cavity closure region, and the rise rate of pressure in space tends to be higher in the upwind side when the flow is non-axisymmetric. The transient pressure variations during the cavity formation procedure were also present. The method of measurement in this paper can be referenced by engineers. The result helps to study the flow pattern of cavity closure region, and it can also be used to analyze the formation of supercavitating vehicle hydrodynamics.

摘要：Monitoring the ecology and physiology of corals,sediments,planktons,and microplastic at a suitable spatial resolution is of great importance in oceanic scientific *** meet this requirement,an underwater microscope with an electrically controlled variable lens was designed and *** captured microscopic images of corals,sediments,planktons,and microplastic revealed their physical,biological,and morphological *** studies of the images also revealed the growth,degradation,and bleaching patterns of corals;the presence of plankton communities;and the types of *** imaging performance is majorly influenced by the choice of lenses,camera selection,and lighting *** dehazing,global saturation masks,and image histograms were used to extract the image *** experimental proof was obtained with micro-scale images of corals,sediments,planktons,and microplastic at different *** designed underwater microscope can provide relevant new insights into the observation and detection of the future conditions of aquatic ecosystems.

摘要：目的:为研究船舶在实际海浪环境中的水弹性与耐波性,本文提出一种新型模型试验技术。将相同船型不同尺度的模型分别在近海环境和水池环境中测量的试验数据进行比较,分析两种试验方法所得结果的差异,以说明水池模型试验方法所存在的问题,从而进一步证明新型试验技术的优越性。创新点:1.提出大尺度自航模型在实际海浪环境中实施水动力试验的技术和方法;2.将大尺度模型试验结果与传统水池模型试验结果进行比较,分析二者的差异。方法:针对某母型船,分别建造缩尺比为1:25和1:50的大尺度模型和小尺度模型。大尺度模型在自然海域的三维海浪中进行试验测量,而小尺度模型在水池长峰不规则波中进行试验测量。测量过程中保证两者的控制参数相似,并分析试验结果存在的差异。将数值计算的结果与大尺度模型试验的结果进行比较,并基于数值计算分析海浪的方向分布函数对结果的影响。结论:在近海海域中开展的大尺度模型耐波性与波浪载荷试验表明,本文提出的试验测试系统和试验方案是可行的。大尺度模型试验是在自然海浪环境中进行的,比水池环境更接近实船的实际航行环境,所得数据对于船舶设计和研发具有更高的参考价值和意义。

摘要：This study combined fault identification with a deep learning algorithm and applied a convolutional neural network(CNN)design based on an improved balanced crossentropy(BCE)loss function to address the low accuracy in the intelligent identification of seismic faults and the slow training speed of convolutional neural networks caused by unbalanced training sample *** network structure and optimal hyperparameters were determined by extracting feature maps layer by layer and by analyzing the results of seismic feature *** BCE loss function was used to add the parameter which is the ratio of nonfaults to the total sample sets,thereby changing the loss function to find the reference of the minimum weight parameter and adjusting the ratio of fault to nonfault *** method overcame the unbalanced number of sample sets and improved the iteration *** a brief training,the accuracy could reach more than 95%,and gradient descent was *** proposed method was applied to fault identification in an oilfield *** trained model can predict faults clearly,and the prediction results are basically consistent with an actual case,verifying the effectiveness and adaptability of the method.

摘要：The fuzzy switched PID controller which combines fuzzy PD and conventional PI controller is proposed for ship track-keeping autopilot In this paper. By using rudder angle, the whole voyage is divided into two operating regimes which named transient operating regime and steady operating regime respectively. The fuzzy PD controller is employed in transient operating regime for increasing response, reducing overshoot and shorting transition time. And conventional PI controller is used to improve the stable accuracy in steady operating regime. The global controller is achieved by fuzzy blending of all local controllers. Routh stability criterion is utilized to obtain the stability condition of closed-loop system. The simulation results show the effectiveness of proposed method.

摘要：The marine ecological cultural heritage demonstrates tiie long-standing wisdom of human marine ecological culture. Its effective protection and inheritance is a continuation of the traditional marine ecological lifestyle, and is also an important impetus to the current construction of marine ecological civilization in China. The paf ticipation and interaction of cultural origins should be pfomoted, system protection management systems should be continuously improved, policies, reguktions and supporting mechanisms should be improved, and scientific evaluation mechanisms should be established, gradually realizing innovative development.