油气田开发项目平均投资利润率和利税率的确定

行业平均投资利润率和行业平均投资利税率是投资者进行投资机会选择的主要参考依据之一，是投资者对其投资项目收益的最低期望要求。从投资者角度来讲，恰当地确定平均投资利润率和行业平均投资利税率是一个相当重要而又比较棘手的问题。文章主要讨论了如何确定油气田勘探开发项目经济评价中平均投资利润率和行业平均投资利税率的一种简单方法。     

激电中梯和激电测深在寻找铜锌多金属矿中的应用

目前在多金属矿床勘查的物探方法中,激电中梯和激电测深是一种最有效的物探方法之一,在分析勘查区的地质资料的基础之上,合理布设测线,合理选取电极装置,通过分析整理激发极化法电测深数据,得到能够较准确地反映地下矿体的赋存、分布等特征的地质成果资料,预测成矿有利区段,所圈定锌多金属矿找矿靶区在后来的地质找矿工作中得到了证实。     

海南省琼海市环境地质问题与防治对策建议

据城市环境地质调查结果显示,随着城市建设的加快,海南省琼海市存在地下水资源短缺、地质灾害、海岸带变迁等主要环境地质问题。本文详细论述了琼海市这些日益突出的环境地质问题,分析各个问题产生的原因,并有针对性地提出科学的防治对策建议,为该地区国土开发整治和城市规划、建设、管理提供地质科学依据。     

地质勘测各阶段技术要点探究

地质勘测工程具有复杂、要求高的特点,本文从工程地质勘测出发,对其勘测方法、勘测原则作出了分析,重点探讨了地质勘测施工各阶段需要控制的要点,具有一定的借鉴效果。     

Oil risk contracts,business conduct and performance patterns: Data panel analysis

Using the economic and financial performance data of international companies for the exploration, and exploration–extraction (E&E) of oil, as well as the patterns of institutional situation and orientation with the government market and national oil companies or NOCs that receive project offers, we analyze the institutional development and behavior patterns by type of E&E contract, following the strategic actor approach, or the so-called agency theory. Additionally, in light of Mexico's energy reform being implemented between 2015 and 2019, we analyzed the types of license contracts compared to those for production and shared profit. Subsequently, it was determined-through panel data methods in the analysis of 17 companies between 2005 and 2015-that global companies present bigger yields and commitments compared to specialized companies, confirmed by their net income and returns on equity or ROE.     

四川秦巴山区矿产资源绿色开发策略研究

四川秦巴山区矿产资源种类丰富,矿产资源的开发利用已成为经济发展的支柱产业之一,但矿业生产过程中产生了严重的矿山环境地质问题。在分析了研究区矿产资源现状的基础上,总结了四川秦巴山区油气开发和固体矿产开发中产生的环境问题,结合国内外矿产资源开发利用实例研究,提出了四川秦巴山区矿产资源的绿色循环开发策略与建议:完整的矿山环境法规是矿产资源绿色开发的根本保障;完善的规划和严格的环境评价是矿产资源可持续开发的第一要务;推进矿山相关科学技术创新是提高矿产开发利用率、矿山生态环境治理的唯一途径,最终使得四川秦巴山区矿业在促进经济腾飞的同时实现绿色可持续发展。     

Tradespace exploration of in-space communications network architectures

Making architectural decisions in long lifecycle systems is challenging because the time between system definition and end of operations can span multiple decades, resulting in shifts in stakeholder needs and major advances in technologies. Space-based communications using relay satellite constellations is one such example, requiring substantial up-front planning to define capabilities and size capacity due to the large investment of time and resources. Additionally, there are numerous viable system architectures. In this paper, we build on existing methods to develop a graph-based decision method to assess and explore architectural flexibility in the future evolution of long lifecycle systems. The tradespace graph defines edges between similar architectures, quantifies the switching cost between architectures, using graphs to analyse the potential system evolution pathways. In a test case on NASA communication satellites, we find that hosting government communications payloads, in particular optical payloads, on commercial satellites could reduce cost and increase flexibility of the NASA network.     

对高校评奖评优工作的几点思考

评奖评优是高校学生管理的重要组成部分,具有激励、资助和导向的作用。本文主要就高校评奖评优工作进行了研究,并提出了一些看法。     

新形势下高职院校大学生志愿服务城市社区的若干探索

本文通过实地走访调研某高职院校大学生志愿者参与城市社区志愿服务活动,探讨存在的困难与问题,并提出建议。     

Microfoundations of network exploration and exploitation capabilities in international opportunity recognition

While international entrepreneurship (IE) recognizes opportunity recognition (OR) as a central activity and the prominent role of network capabilities in OR, it is not informative as to how different network capabilities influence OR in international markets. We utilize dual network capability through the lens of exploration-exploitation to better understand how these two different capabilities influence the identification of international opportunities. Given that microfoundations perspective and prior experience in IE are under-developed and under-theorized, we explore founder’s prior experience as an essential microfoundation for the dual network capability. By employing structural equation modeling on a sample of 647 early internationalizing firms from a developing country, the study demonstrates that founders’ prior experience is a significant microfoundation of dual network capability in international OR. However, both exploration and exploitation capabilities fail to bring new opportunities in a changing market environment. A post-hoc analysis reveals that at a higher level of market change, younger firms benefit more from network exploration, whereas older firms achieve greater success when leveraging benefits from network exploitation. The study concludes with implications and future research avenues.