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China:In the fourth quarter of 2023,exports of yarn and fabric to ASEAN ceased declining and rebounded

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China Textile 2024年第1期 22-23页

On January 8th,the China Chamber of Commerce for Import and Export of Textiles released data showing that in the fourth quarter,China’s textile and clothing exports gradually *** proportion of intermediate exports in textile and clothing exports continued to rise,providing a new impetus for the substantial expansion of exports to traditional markets and international supply chain cooperation.

关键词： Export quarter fourth

China Natural Gas Industry Prosperity Index for the 1st quarter of 2024

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China Oil & Gas 2024年第2期31卷 59-62页

作者： Lin Anqi Qiu Yufei Yang Xiaoxi China Energy Index Research Center Southwest Petroleum University

The statistics of the China matural gas industry prosperity index showed that the China natural gas industry prosperity index was 302.84 in the 1st quarter of 2024,up 3.6%from the 4th quarter of 2023,a stably prosperous state in the short term and a very prosperous state in the medium to long term;the prosperity index of natural gas production companies was 428.78 in the 1st quarter of 2024.

关键词： companies quarter prosperity

Bandwidth-reduced Brillouin optical time-domain analysis based on a quarter of the frequency of modulation

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Optoelectronics Letters 2022年第8期18卷 472-478页

作者： ZHANG Xiangfei WEI Zhengjun ZHENG Yingfang WANG Jindong Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials South China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Nanophotonic Functional and Devices South China Normal UniversityGuangzhou 510006China

Aiming at the problem of high requirement for the signal generator in the Brillouin optical time-domain analysis(BOTDA)system,a quarter of the Brillouin frequency shift(BFS)of modulation is proposed to reduce the required bandwidth of the sensing system.A functional model for solving the intensity of each-order sideband of the output light of electro-optic modulator(EOM)is proposed and applied,so the spectrum with suppressed the carrier and the first-order sidebands while maximizing the second-order sidebands is *** with the latest scheme,the intensity of the second-order sidebands is increased by 21.1%based on this functional *** the experiment,the second-order upper sideband and the second-order lower sideband are used as continuous wave(CW)probe light and pump pulse light,respectively,which ultimately reduces the required bandwidth of radio frequency(RF)signal sources to a quarter of the BFS(reduced from~11 GHz to~2.75 GHz),and the frequency sweep range is also reduced to a quarter of the original.

关键词： bands analysis quarter

A broadband terahertz quarter wave plate based on asymmetric cross slots

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Optoelectronics Letters 2019年第5期15卷 352-355页

作者： PAN Wu REN Xin-yu CHEN Qi WANG Xue-yin College of Photoelectronic Engineering Chongqing University of Posts and Telecommunications

In this paper, a transmissive terahertz(THz) quarter wave plate(QWP) has been proposed to realize the linear-to-circular polarization conversion in terahertz range. This quarter wave plate is composed of two dielectric layers and one metallic layer with asymmetric cross slots. In the range of 0.894-1.378 THz, the axis ratio of proposed device is less than 3 d B, and its polarization conversion efficiency is more than 45%. The distributions of surface currents and electromagnetic field density had been proposed to understand the physical mechanism of proposed device. The linear-to-circular polarization conversion can be attributed to the asymmetric transmission along slots. Finally, the simulation results are validated by experiments in terahertz region. The proposed device has simple geometry and good performance, which can be used as a key component in applications of terahertz communications, terahertz imaging and terahertz sensing.

关键词： transmissive terahertz(THz) quarter wave plate(QWP) asymmetric cross slots

Chinese rare earth import and export in the first quarter of 2015

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China Rare Earth Information 2015年第5期21卷 5-6页

作者： Antaike Consulting Research Center Antaike Consulting Research Center

Import of rare earth metal and alloy in China up 38%in the first quarter year-on-year According to customs statistics,China imported 27.67 tons of rare earth metals and alloys in March,valued USD 427,*** from January to March accumulated to 100.4 tons,up 38.1%*** import value totaled USD 1.28 million during the first three *** January to march,China imported 65.

关键词： quarter import customs exported accumulated Export march permanent valued totally

Analysis of China Natural Gas Industry Prosperity Index for the 3rd quarter of 2023

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China Oil & Gas 2023年第5期30卷 60-63页

作者： Xu Yihan Zhou Cuilan Shen Xilin China Energy Index Research Center Southwest Petroleum University

The statistics of the China natural gas industry prosperity index showed that the China natural gas industry prosperity index was 277.03 in the 3rd quarter of 2023,up 4.0%from the 2nd quarter of 2023,a stably prosperous state in the short term and a very prosperous state in the medium to long term;the prosperity index of natural gas production companies was 390.88 in the 3rd quarter of 2023,up 5.2%from the 2nd quarter of 2023,an increasingly prosperous state in the short term and a very prosperous state in the medium to long term;the prosperity index of natural gas sales companies was 181.91 in the 3rd quarter of 2023,up 3.3%from the 2nd quarter of 2023,a recovery in the short term and a prosperous state in the medium to long term;the prosperity trend index of the natural gas industry in the coming year for the 3rd quarter of 2023 was 538.84,up 6.4%from the 2nd quarter of 2023,a very prosperous state,indicating that natural gas industry experts are optimistic about the natural gas industry’s prosperity trend in the coming year(Fig.1 and Table 1).

关键词： companies quarter prosperous

Operation analysis of home textile industry in the first quarter of 2019

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China Textile 2019年第7期 42-45页

In the first quarter of 2019, the overall performance of the home textile industry tended to be stable under the influence of the complex international economic situation and the Spring Festival holidays. The export of the industry has increased steadily, and the benefit of the industry has decreased compared with the previous year, but the efficiency has improved. Enterprises are optimistic about the industry’s second quarter expectations.

关键词： Operation analysis textile industry quarter

An Analysis on the Segmented Car Market in the First quarter

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中国汽车（英文版） 2006年第6期 12-13页

China's Nonferrous Metals Industry in the First quarter

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China Nonferrous Metals Monthly 2005年第6期 1-5页

In the first quarter of 2005, the base metals prices were kept high both in China and abroad. Under such situation, China’s production of nonferrous metals kept increasing with much improved economic results for the major producers. The foreign trade value also kept increasing. However, the scale of growth in production and economic returns went down.

关键词： quarter nonferrous prices owned returns Henan alum