Selecting the optimum location of the corner using gravity gradient method

The conventional gravity gradient method to plot the geologic body location is fuzzy. When the depth is large and the geologic body is small, the Vzz and Vzx derivative errors are also large. We describe that using the status distinguishing factor to optimally determine the comer location is more accurate than the conventional higher-order derivative method. Thus, a better small geologic body and fault resolution is obtained by using the gravity gradient method and trial theoretical model calculation. The actual data is better processed, providing a better basis for prospecting and determination of subsurface geologic structure.

High-Order Lateral Buckling Analysis of Submarine Pipeline Under Thermal Stress

It is of importance to study and predict the possible buckling of submarine pipeline under thermal stress in pipeline design.Since soil resistance is not strong enough to restrain the large deformation of pipeline,high-order buckling modes occur very easily.Analytical solutions to high-order buckling modes were obtained in this paper.The relationships between buckling temperature and the amplitude or the wavelength of buckling modes were established.Analytical solutions were obtained to predict the occurrence and consequence of in-service buckling of a heated pipeline in an oil field.The effects of temperature difference and properties of subsoil on buckling modes were investigated.The results show that buckling will occur once temperature difference exceeds safe temperature;high-order pipeline buckling occurs very easily;the larger the friction coefficients are,the safer the submarine pipeline will be.

道德情感的实践攀升——论布莱克本的实践功能主义

当前的元伦理学争辩在很大程度上呈现了以语言分析为特征的哲学思辨方式。其中,以道德推理之逻辑有效性为焦点的“弗雷格-吉奇难题”对强调情感态度的非认知主义理论构成了核心挑战,而布莱克本的实践功能主义是对该挑战最有力的回应之一。一方面,通过重新阐释道德语句的实践意涵,布莱克本为道德假言推理的逻辑有效性提供了有力辩护;另一方面,通过厘清道德情感的实践攀升机制,布莱克本的理论构想着重突出了道德命题背后的人类情感和伦理道德的实践本质。尽管这种实践功能主义在处理人类纯粹偏好方面仍有待完善,但对这一回应思路的具体剖析,可在一定程度上为伦理学知识体系的建构提供一种以“实践”为核心的批判性参照。