Zobrazeno 1 - 10
of 2 910
pro vyhledávání: '"Duan Jun"'
Publikováno v:
中国工程科学, Vol 26, Iss 3, Pp 98-107 (2024)
Cobalt is an essential material for the development of the new energy industry. Based on the latest data regarding the cobalt resource industry of China and worldwide, this study analyzes the challenges faced by the development of China’s cobalt re
Externí odkaz:
https://doaj.org/article/8b69cd6687614c6bb66e880e5000b206
Publikováno v:
中国工程科学, Vol 26, Iss 3, Pp 86-97 (2024)
Nickel resources are vital for national economic development. As the largest consumer of nickel metal worldwide, China faces a scarcity of nickel metal raw materials which depend highly on imports. Therefore, it is necessary to achieve breakthroughs
Externí odkaz:
https://doaj.org/article/e9516b9b0954428997f8081aa9bf098b
Publikováno v:
Xiehe Yixue Zazhi, Vol 15, Iss 3, Pp 513-517 (2024)
With the popularization of transplantation technology, an increasing number of end-stage organ failure patients are undergoing transplantation surgery, and most of these patients need further monitoring and treatment in the department of critical car
Externí odkaz:
https://doaj.org/article/74b6d63aabf2407a9c8027202f0605e4
Effect of cryogenic-thermal cycling treatment on tribological properties of Ti-based amorphous alloy
Publikováno v:
Cailiao gongcheng, Vol 50, Iss 12, Pp 120-127 (2022)
The wear resistance of titanium alloy is poor, the preparation of amorphous alloy coating on the surface of titanium alloy moving parts is a choice to maintain the advantages of titanium alloy and improve its wear resistance. The microstructure and t
Externí odkaz:
https://doaj.org/article/2866a723ce3644a98209dcd459306f87
Publikováno v:
Cailiao Baohu, Vol 55, Iss 8, Pp 134-139 (2022)
In the field of material protection coating, there is a market demand for replacing the traditional electroplating process with the thermal spraying process, but supporting information in the aspects of the cavitation and corrosion resistances of cor
Externí odkaz:
https://doaj.org/article/fc85e92c335242d3aa2528e7318e5512
Publikováno v:
中西医结合护理, Vol 7, Iss 11, Pp 78-81 (2021)
Aviation medical rescue has the advantage of quick response and safe in emergency rescue and enters a stage of rapid growth. Given a late start of Aviation medical rescue in China, its shortcoming lies in dispatch system, equipment allocation, manage
Externí odkaz:
https://doaj.org/article/d4b8f8f555c845d1ba71e26e2c24ab38
Publikováno v:
Di-san junyi daxue xuebao, Vol 42, Iss 15, Pp 1489-1494 (2020)
Objective To explore the application value of chemiluminescence detection of SARS-CoV-2 IgM/IgG antibodies in the adjuvant diagnosis and treatment of coronavirus disease 2019 (COVID-19). Methods A total of 208 COVID-19-confirmed patients admitted in
Externí odkaz:
https://doaj.org/article/c957ae01709349bda334ffa52bdcb2fd
Autor:
Zhang Baoshuai, Duan Jun
Publikováno v:
Applied Mathematics and Nonlinear Sciences, Vol 5, Iss 2, Pp 461-472 (2020)
In this paper, the CAViaR model was used to measure the HS300, HSI and N225 risk levels and result showed that CAViaR model was able to measure the sample risk value at the 5% confidence level. However, at the 1% confidence level, the CAViaR model se
Externí odkaz:
https://doaj.org/article/312361643bbb4611ad6223b54d8bbda4
Autor:
Duan Jun, Zhang Baoshuai
Publikováno v:
Applied Mathematics and Nonlinear Sciences, Vol 5, Iss 2, Pp 473-482 (2020)
This paper described the volatility characteristic of the rate of return of financial asset by using QR-GARCH model, through introducing EVT model and constructing the extreme risk measure model based on QR-GARCH-EVT. In this paper, HS300 index data
Externí odkaz:
https://doaj.org/article/9c0743b56fce4aa3b1dde24611a8da2c
Autor:
Duan Jun-Sheng, Xu Yun-Yun
Publikováno v:
Open Physics, Vol 17, Iss 1, Pp 850-856 (2019)
The steady state response of a fractional order vibration system subject to harmonic excitation was studied by using the fractional derivative operator −∞Dtβ,${}_{-\infty} D_t^\beta,$where the order β is a real number satisfying 0 ≤ β ≤ 2.
Externí odkaz:
https://doaj.org/article/e000bedf881b471081e5a4322d391ab5