The Status and Trend Analysis of Geothermal Development and Utilization in China

ABSTRACT Based on historical review and status analysis of geothermal development in China, this paper attempts to discuss reasons of stagnant development of high temperature geothermal resources for electricity generation and quick development of low-medium temperature geothermal resources for direct utilization of the past decade. It is suggested that China should give more importance to the non-electrical utilization of low-medium temperature geothermal resources. Particularly, it should choose big and medium-sized cities with good resource potential in order to develop space heating and tourism. On the other hand, China should also concentrate on geothermal reinjection and the use of heat pumps so as to achieve success featured by environmentally friendly, highly efficient, and energy saving geothermal developments. This ensures the sustainable development of geothermal resources

INTERNATIONAL TRADE AND GENDER WAGE GAP IN CHINA

It is a new field to analyze how foreign trade impacts gender wage gap in China. Combining Chinese Household Income Project (CHIP) in 2002 and 2007, the paper aims at researching the impacts of international trade on gender wage discrimination. The paper finds that the development of foreign trade will increase gender wage inequality, which contradicts the neoclassical theory. Specifically, in the aspect of trade dependence, the import dependence and total trade dependence has a statistically significant and positive impact on gender wage gap. From the perspective of mode of trade, compared with processing trade dependency, the import dependency of general trade and foreign trade dependency have more statistically significant impacts on gender wage gap, and the impact of import of general trade on gender wage gap is sizable and statistically significant. From the perspective price, price of trade has a negative impact on gender wage gap, but compared with the price changes of total trade and processing trade, only import price of general trade and total price of import and export have statistically significant impacts on gender wage gap. Finally, changes of terms of trade have a positive impact on gender wage gap, but the impact is not statistically significant

Ideas and Measures for Promoting Modernization of Tax Administration in the New Era in the Context of Smart Tax Construction

The practice of China's tax modernization construction has accumulated rich experience for the modernization of tax collection and management, while the new era, accelerating the modernization construction with Chinese characteristics, has put forward new requirements of the times for the modernization of tax collection and management. The Opinions on Further Deepening the Reform of Tax Collection and Administration of the Central Office and the State Office pointed out that it is necessary to comprehensively push forward the digital upgrading and intelligent transformation of tax collection and administration, and to holistically and integrally improve the effectiveness of tax governance. The State Administration of Taxation has also repeatedly requested that the construction of smart tax supported by tax big data should be pushed forward to provide more powerful data support for the modernization of tax collection and management. This paper takes smart tax construction as the research background, analyzes the problems of modernization of tax collection and administration in the new period, and on this basis puts forward the suggestions of optimizing system design, strengthening tax governance by numbers, transforming the way of tax management and service, and perfecting the mechanism of talent cultivation, etc., in an attempt to explore the path of development of modernization of tax collection and administration

Martian column CO2 and pressure measurement with spaceborne differential absorption lidar at 1.96 µm

By utilizing progress in millijoule-level pulsed fiber lasers operating in the 1.96 µm spectral range, we introduce a concept utilizing a spaceborne differential absorption barometric lidar designed to operate within the 1.96 µm CO2 absorption band for remote sensing of Martian atmospheric properties. Our focus is on the online wavelength situated in the trough region of two absorption lines, selected due to its insensitivity to laser frequency variations, thus mitigating the necessity for stringent laser frequency stability. Our investigation revolves around a compact lidar configuration, featuring reduced telescope dimensions and lower laser pulse energies. These adjustments are geared towards minimizing costs for potential forthcoming Mars missions. The core measurement objectives encompass the determination of column CO2 absorption optical depth, columnar CO2 abundance, surface atmospheric pressure, and vertical distributions of dust and cloud layers. Through the amalgamation of surface pressure data with atmospheric temperature insights garnered from sounders and utilizing the barometric formula, the prospect of deducing atmospheric pressure profiles becomes feasible. Simulation studies validate the viability of our approach. Notably, the precision of Martian surface pressure measurements is projected to surpass 1 Pa when the aerial dust optical depth is projected to be under 0.7, a typical airborne dust scenario on Mars, considering a horizontal averaging span of 10 km.</p

Optical and Electronic Properties of Femtosecond Laser-Induced Sulfur-Hyperdoped Silicon N+/P Photodiodes

Impurity-mediated near-infrared (NIR) photoresponse in silicon is of great interest for photovoltaics and photodetectors. In this paper, we have fabricated a series of n+/p photodetectors with hyperdoped silicon prepared by ion-implantation and femtosecond pulsed laser. These devices showed a remarkable enhancement on absorption and photoresponse at NIR wavelengths. The device fabricated with implantation dose of 1014 ions/cm2 has exhibited the best performance. The proposed method offers an approach to fabricate low-cost broadband silicon-based photodetectors

Magnetic and Electrical Properties of Heusler Alloy Co 2 MnSi Thin Films Grown on Ge(001) Substrates via an Al 2 O 3 Tunnel Barrier

Heusler alloy Co 2 MnSi/Al 2 O 3 heterostructures on single-crystal Ge(001) substrates were prepared through magnetron sputtering for both Co 2 MnSi and Al 2 O 3 thin films as a promising candidate for future-generation semiconductor-based spintronic devices. Sufficiently high saturation magnetization 781 emu/cm 3 was obtained for the Co 2 MnSi thin film. Furthermore, the current versus voltage (I-V) characteristics showed that the tunneling conduction was dominant in Co 2 MnSi/Al 2 O 3 (2 nm)/Ge(001) heterostructure and the I-V characteristics were slightly dependent on temperature. The conductance versus voltage (dI/dV-V) characteristics indicated that the potential barrier height at the Co 2 MnSi/Al 2 O 3 interface was almost equal to that at the n-Ge/Al 2 O 3 interface for the prepared Co 2 MnSi/Al 2 O 3 /Ge(001) heterostructure