ISSUES ON CHINA′S ENERGY SECURITY

For many years, China has made great strides in constructing a sizeable and stable energy supply system rooted mainly in domestic coal supply. That system, however, is subject to immense strain as a result of rapid economic growth, rising living standard, widespread environmental degradation, limited oil reserves and uneven resources distribution. Industrialization and urbanization since the early 1980s have imposed structural constraints on its traditional coal-based energy supply model. Eventually, China became a net oil-importer in 1993 when ten million tons of crude oil and petroleum products from abroad fed into the local economies of the coastal areas. Such a change meant that energy security has become an increasingly sensitive issue to the central government of China. This paper argues that China could benefit from a more open energy supply by striking to a balance of both domestic and international sources, rather than the traditional mode emphasized on a highly self-sufficiency rate.

Multifunctional graphene‐based composite photocatalysts oriented by multifaced roles of graphene in photocatalysis

Graphene(GR),a single‐layer carbon sheet with a hexagonal packed lattice structure,has displayed attractive potential and demonstrably become the research focus in artificial photocatalysis due to its enchanting properties in enhancing light absorption,electron transfer dynamics,and surface reactions.Currently,numerous efforts have shown that the properties of GR,which are closely correlated to the photocatalytic performance of GR‐based composites are significantly affected by the synthesis methods.Herein,we first introduce the optimization strategies of GR‐based hybrids and then elaborate the synthesis of GR‐based composite photocatalysts oriented by manifold roles of GR in photoredox catalysis,containing photoelectron mediator and acceptor,improving adsorption capacity,regulating light absorption range and intensity,as well as macromolecular photosensitizer.Beyond that,a brief outlook on the challenges in this burgeoning research field and potential evolution strategies for enhancing the photoactivity of GR‐based hybrids is presented and we anticipate that this review could provide some enlightenments for the rational construction and application of multifunctional GR‐based composite photocatalysts.

Analysis of China's Strategy for Future Energy Development

China has quickly risen to the top ranks in global energy demand over the past few years.China is the world’s second-largest oil consumer behind the United States and became the largest global energy consumer in2010. The country was a net oil exporter until the early 1990s and became the world＇s second-largest net importer of crude oil and petroleum products in 2009. Then the country became the world＇s largest oil importer in 2014. Meanwhile, China＇s oil consumption growth accounted for one-third of the world＇s oil consumntion growth

Strategies of Chinese Offshore Oil Engineering Companies to Go Global

Alang with big drop of oil prices, offshore oil engineering market demand is witnessing profound changes. This brings rare opportunities while huge challenges for Chinese offshore oil engineering enterprises. Chinese offshore oil engineering enterprises have made rapid development in recent years, but they still have a certain gap with European and American competitors. Only by answering the time＇s call for developmentof international market and having the courage to participate in international competition could Chinese offshore oil engineering enterprises gnaw strong unceasingly.

China＇s Oil Security Issues and Countermeasures in the Context of Economic Globalization

In the context of economic globalization and economic crisis, China＇ s oil security issues are not merely related to energy access and consumption, but also involve many aspects of the political and economic factors which are becoming increasingly complex. In view of this, we should not only need to attach great importance to energy security, making full use of ＂two markets and two resources＂ to take a variety of channels to ensure oil supply diversification, but also should develop oil security strategy from a strategic level, and actively participate in international oil trading system. Furthermore, we should support China＇ s oil enterprises from the political, financial and other aspects, so as to ensure adequate, stable and affordable supply ofoil to meet China＇ s economic construction requirement.

Background and Effects of Deepening Reform of the Oil and Gas Industry System

Under the background of a fourth wave of industrial revolution and a period of worldwide energy transformation, deepening the reforms in the oil and gas industry, system is of great significance. After reviewing the achievements and summarizing the problems of the oil and gas industry in China, this paper lays emphasis on the key aspects of this new round of deepening reforms, and holds rite position that this reform, based on the implementation of the national energy strategy, covers the entire oil and gas industry chain by liberalizing market access, reforming market mechanisms, and strengthening management. The reform will bring far-reaching effects upon the entire chain and the participants of the oil and gas industry. It will help to improve the market-oriented allocation of resources, allow enterprises to interact as competitors, and enhance the national oil and gas security.

云岡石佛小记

雲冈石佛为我国雕刻之精英,其壮伟遒(?),后世罕及。惟以地处旁塞,昔人往往不措意。自法兰西学者为之撮影解说,而交通亦日益利便,遂渐著于世。三十年来东西学者之考雲冈石佛者甚伙,各执一说,然亦不无同然者。愿散见各处,搜求不易,甚或以珍本而杂观。故汇粹诸说,甄别取舍,著其持之有故,言之成理者于此,取便观览云尔。

家居中的贵族血统——达芬奇

阔宅与豪宅之间,气质迥异。汇聚着世界高端品质、纯正欧美皇族血统家具的达芬奇家居,以其杰出的艺术气质和完美的手工技艺,为准贵族们缔造了一个艺术的殿堂。

Oil Strategies Benefits over Different Driving Cycles using Numerical Simulation

95 g/kin is the allowed quantity of CO2 emission normalized to NEDC to be set in 2020. In addition, NEDC will be replaced by more severe driving cycles and will be united worldwide. To respond to those criteria, automotive industries are working on every possible field. Thermal management has been proved to be effective in reducing fuel consumption. Cold start is a primordial reason of ovcrconsumption, as the engine highest efficiency is at its optimal temperature. At cold start, the engine＇s oil is at its lowest temperature and thus its higher viscosity level. A high viscosity oil generates more friction, which is one of the most important heat losses in the engine. In th/s paper, hot oil storage is studied. Numerical simulations on GT-suite model were done. The model consists of a 4-cylinder turbocharged Diesel engine using a storage volume of 1 liter of hot oil. Ambient temperature vari- ation were taken into consideration as well as different driving cycles. Furthermore, different configurations of the thermal strategy （multifunction oil sump） were proposed and evaluated. Lubricant temperature and viscosity profiles are presented in the article as well as fuel consumption savings for different configurations, driving cycles and ambient temperatures.

Bimetallic phthalocyanine heterostructure used for highly selective electrocatalytic CO_(2) reduction

Heterogeneous molecular catalysts,such as metal phthalocyanines,are efficient electrocatalysts for CO_(2) reduction reaction(CO_(2)RR).However,the rational design and synthesis of a molecular catalyst-based heterostructure for CO_(2)RR remains challenging.Herein,we developed a crystalline bimetallic phthalocyanine heterostructure electrocatalyst(CoPc/FePc HS),which achieved an excellent CO_(2)-to-CO conversion efficiency(99%)and outstanding long-term stability after 10 h of electrocatalysis.Density functional theory calculations revealed that the enhancement of CO_(2)RR performance could be attributed to the distinct electron transfer pattern between FePc and CoPc.The heterostructural engineering in molecular catalysts would inspire a unique approach for improving CO_(2)RR performance.