两岸新能源产业合作前景探讨

目前,两岸的能源消费仍以常规能源为主,这些能源不仅不可再生,还会带来严重的环境污染;此外,两岸90%以上的能源依赖进口,能源安全存在隐患;其实,两岸近年来制定的战略性新兴产业规划中,都包括新能源产业的发展。因此,两岸存在共同的合作基础和强烈的合作动力。本文首先对新能源及新能源产业的内涵进行界定,其次分析两岸新能源产业合作的现状,进而对两岸新

Measurement of the Static Optoelectronic Characteristics of InGaAs/InP Avalanche Photodiode

建立了雪崩二极管的静态光电特性的自动测试系统。利用该系统对光敏面的直径为500μm的台面型InGaAs/InP雪崩光电二极管(APDs)进行测试。测试结果表明,该APD器件在90%击穿电压下的暗电流为151nA,在直径500μm的光敏面上其光响应均匀性良好。提出一种测量雪崩二极管倍增因子的方法,只需利用普通的测量电流-电压的测试仪器,就可以获得开始倍增时的光电流,从而得到APD的倍增因子。通过该方法得到的InGaAs/InPAPD器件最大倍增因子的典型值在10～100量级。A measurement system is set up which could measure static optoelectronic characteristics of avalanche photodiodes (APDs). By using this system, the mesa-structure InP/InGaAs APDs is measured. The results show that the APDs have a relatively low dark current (～150 nA at 90% of breakdown) and a uniform photoresponse profile of about 500 μm diameter. A method of getting APDs's multiplication gain is also proposed. Through getting the photocurrent at the point where multiplication is beginning, the multiplication gain can be obtained by the simple current-voltage equipment. For InP/InGaAs APDs, the typical maximum multiplication gain measured by this method is about 10～100

南海中深层动力格局与演变机制研究进展

南海是连接印度洋-太平洋的最大边缘海,在季风、海峡水交换以及复杂地形影响下,南海环流呈现出独特的三层结构以及远强于大洋的混合特征.理论与观测表明,南海内潮、内孤立波以及强风等过程是强混合的动力来源.在南海强混合作用下,南海发育了活跃的中深层动力系统,一方面促进了南海与大洋之间的水体交换,另一方面调控上层风生环流,使得南海环流显著区别于其他热带与副热带海盆.南海活跃的中深层环流所具有的物质搬运能力又显著影响着南海的地质沉积、生物地球化学循环等过程.中国对深海研究持续投入,在南海中深层环流动力学研究方面取得了显著的成果,文章就该方面进行总结,并对南海深海环流未来研究设想进行初步探讨

Ti-6Al-7Nb合金与口腔常用合金间电偶腐蚀的研究

目的：评价Ti-6Al-7Nb合金与3种口腔常用合金在人工唾液中的电偶腐蚀性。方法：运用电化学方法测量Ti-6Al-7Nb合金与纯钛（TA2型）、Ni-Cr烤瓷合金、Co-Cr合金4种金属材料在人工唾液中的自腐蚀电位（Ecorr）塔菲尔曲线,并测量Ti-6Al-7Nb合金与其他3种金属组成电偶对后的电偶电流密度值,分析Ti-6Al-7Nb合金与不同金属偶合后的耐电偶腐蚀能力。结果：Ti-6Al-7Nb合金、TA2、Co-Cr合金和Ni-Cr烤瓷合金的Ecorr值（mV）分别为-111.8±0.02、-156.6±0.03、-246.2±0.07和-298±0.08,两两比较均有显著性差异（P〈0.01）;Ti-6Al-7Nb合金与TA2、Co-Cr合金和Ni-Cr烤瓷合金组成电偶对后测得的电偶电流密度值（μA/cm^2）分别为0.46±0.21、1.37±0.90和2.25±1.52,两两比较均有显著性差异（P〈0.01）。结论：Ti-6Al-7Nb合金在人工唾液环境中具有良好的耐腐蚀性能,与牙科常用合金偶合后不会有电偶腐蚀发生

Ti-6Al-7Nb合金与口腔常用合金间电偶腐蚀的研究

目的：评价Ti-6Al-7Nb合金与3种口腔常用合金在人工唾液中的电偶腐蚀性。方法：运用电化学方法测量Ti-6Al-7Nb合金与纯钛（TA2型）、Ni-Cr烤瓷合金、Co-Cr合金4种金属材料在人工唾液中的自腐蚀电位（Ecorr）塔菲尔曲线,并测量Ti-6Al-7Nb合金与其他3种金属组成电偶对后的电偶电流密度值,分析Ti-6Al-7Nb合金与不同金属偶合后的耐电偶腐蚀能力。结果：Ti-6Al-7Nb合金、TA2、Co-Cr合金和Ni-Cr烤瓷合金的Ecorr值（mV）分别为-111.8±0.02、-156.6±0.03、-246.2±0.07和-298±0.08,两两比较均有显著性差异（P〈0.01）;Ti-6Al-7Nb合金与TA2、Co-Cr合金和Ni-Cr烤瓷合金组成电偶对后测得的电偶电流密度值（μA/cm^2）分别为0.46±0.21、1.37±0.90和2.25±1.52,两两比较均有显著性差异（P〈0.01）。结论：Ti-6Al-7Nb合金在人工唾液环境中具有良好的耐腐蚀性能,与牙科常用合金偶合后不会有电偶腐蚀发生

Temporal and spatial distribution characteristics and driving factors of the Mid-Holocene settlements in the Weihai area

Background, aim, and scope Understanding the relationships among humans, climate, and ecosystem is one of the focuses of the PAGES. The Mid-Holocene was a significant period for germination and development of human civilization. During this time, the human tribe was thriving. Thus, it is valuable to study the temporal and spatial patterns of Mid-Holocene settlement sites because it can help refine strategies for future changes from past patterns. Therefore, it has become a hot topic in the study of the relationships between humans and earth in the Mid-Holocene period. Materials and methods In this work, the elevation, slope, slope direction, degree of riverside, and other indicators of Mid-Holocene settlement sites in the Weihai area were studied using the ArcMap software. Results The study produced three main findings. (1) The cultural sequence of Mid-Holocene settlement sites in the Weihai region is the Houli Culture, Dawenkou Culture, Longshan Culture, and Yueshi Culture. Compared with the Neolithic Culture sequence in Shandong Province, the Beixin Culture is absent, and the number of sites shows a right-tilted N-type trend, which increases, decreases, and then increases again. (2) The Mid-Holocene settlement sites in the Weihai region have some regularity in elevation, slope, slope direction, and degree of riverside. They are mainly distributed on flat terrain with a slope between 0° and 4° and an elevation greater than 30 m. In terms of slope direction, those settlement sites are mostly distributed on sunny slopes with directions of southeast, south, and southwest, which account for 58.1% of the total. For degree of riverside, all settlement sites are less than 1.5 km from the river. Discussion If these are facts, it will be inferred that the suitable nature conditions promoted the prosperity of Dawenkou Culture (6.3 4.6 ka BP) because of the arrival of the Mid-Holocene megathermal period which brought the relatively warm climate. In addition, the marine transgression incurring in 5.0 ka BP to 4.0 ka BP might be the main reason for the decline of Dawenkou Culture, and also the limitation of the development of Longshan Culture (4.6 4.0 ka BP) in the later period. What's more, human's dependence on nature conditions and the advanced thought of conforming to nature, seeking advantages and avoiding disadvantages have been developed, as the time passed. Conclusions Human activities of the Weihai area began to appear in the early Mid-Holocene (Houli Culture, 8.5 7.5 ka BP). With the arrival of the great warming period in the Mid-Holocene, the climate generally entered a warm period and was relatively mild. These natural conditions contributed to the Dawenkou Culture (6.3 4.6 ka BP). The transgression during 5.0 4.0 ka BP might be the main reason for the decline of Dawenkou Culture and also limited the development of the Longshan Culture (4.6 4.0 ka BP). Recommendations and perspectives Although the climate began to deteriorate from 4.0 ka BP, sea levels decreased, which provided a more spacious area and fertile soil for the development of humans in Weihai. Furthermore, the ancient river provided a solid foundation for the human culture in that period. All of these superior natural conditions were conducive to the development of Yueshi Culture (4.0 3.5 ka BP)

平面型InGaAs／InPAPD边缘提前击穿行为的抑制

平面型雪崩光电二极管（APD）在结弯曲处具有高的电场，导致在结边缘的提前击穿。运用FEMLAB软件对不同工艺流程制备的三种不同结构平面型InP／InGaAsAPD的电场分布进行了二维有限元模拟，在表面电荷密度为5×10^11cm^-2时分析了吸收层厚度、保护环掺杂浓度、保护环和中央结纵向及横向间距等因素对边缘提前击穿特性的抑制程度。比较了这三种结构的InP／InGaAsAPD在边缘提前击穿的抑制特性的优劣。通过理论研究对平面InP／InGaAsAPD进行了优化

Rectangle object segmentation based on shape preserving and CV variational level set

In order to solve the problems that CV model can&rsquo;t segment object which is partially occluded or has similar gray value with background or has obvious textures, we add shape restraint equations of prior shape to level set function, which keeps the curve to be a specific class shape in the whole evolvement, thus we realize shape preserving in object segmentation. In addition, we build an energy function for rectangle object using our proposed model, deduce a group of corresponding Euler-Lagrange ordinary differential functions and evolve the level set function. By evolution, rectangle object can be segmented, and the final level set function is just the quantitative description of the rectangle object. At last, we validate with three groups of experiments that our model can not only segment the rectangle object from complex backgrounds, but also has lessened calculation and strong robustness.</p