LIVIVO - Search results -

Search results

Result 1 - 10 of total 78

Search options

Article: Thermodynamic investigations on an integrated heat pump with thermal storage for wind-solar hybrid heating

Lei, Biao / Duan, Zhong-Jie / Wu, Yu-Ting

Energy conversion and management. 2022 Feb. 15, v. 254

2022

Abstract: Heating with wind and solar energy is an effective way to reduce carbon dioxide emissions. Vapor Compression Heat Pumps (VCHP) were generally used to improve the utilization rate of wind power. However, normal VCHP driven by wind power or solar energy ... ...

Abstract	Heating with wind and solar energy is an effective way to reduce carbon dioxide emissions. Vapor Compression Heat Pumps (VCHP) were generally used to improve the utilization rate of wind power. However, normal VCHP driven by wind power or solar energy has low performances in low temperature environment and low supply temperature of heating water, and it is also difficult to achieve continues and stable heating because of the intermittence of wind power. The present paper introduces a new integrated heat pump system, in which a VCHP absorbs heat from the environment and sends it to an Absorption Heat Pump (AHP) as its low temperature heat source after temperature lift. Thermal storage system is also equipped for continues heating and it serves as the driving force of the AHP. The results show that the integrated heat pump can produce heating water at 50 °C or even higher with a COP of about 1.42 when the environment temperature is as low as −30 °C. Also, the power consumption of the VCHP accounts for only 5%–18% of the total energy input. This indicates that the energy consumed by the integrated heat pump can be mainly from off-peak electricity produced by the wind turbine.
Keywords	absorption ; administrative management ; carbon dioxide ; electricity ; energy conversion ; energy use and consumption ; heat ; heat pumps ; solar energy ; temperature ; vapors ; wind ; wind power ; wind turbines
Language	English
Dates of publication	2022-0215
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2000891-0
ISSN	0196-8904
ISSN	0196-8904
DOI	10.1016/j.enconman.2022.115276
Database	NAL-Catalogue (AGRICOLA)

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Article ; Online: Influence of water injection atomization on the performance of water-lubricated single screw air compressor

Li Yanan / Wang Jingfu / Wu Yuting / Lei Biao

E3S Web of Conferences, Vol 257, p

2021 Volume 03069

Abstract: As the whole society attaches great importance to the safety of food and medicine, and hydrogen fuel cell and new energy vehicle industry rises suddenly, people’s requirements for clean compressed air is more and more urgent. Water-lubricated single ... ...

Abstract	As the whole society attaches great importance to the safety of food and medicine, and hydrogen fuel cell and new energy vehicle industry rises suddenly, people’s requirements for clean compressed air is more and more urgent. Water-lubricated single screw compressor is an ideal choice for providing clean air because of the advantages of balanced force, a long service life, and high efficiency, and the influencing factors of its performance have received more and more attention. This study established a mathematical model of the working process of a water-lubricated single-screw air compressor to study the relationship between its performance and the water injection atomization. The model considered leakage and heat transfer between water and moist air and analysed the influences of droplet diameter and rotation speed on compressor performance. The results showed that water injection atomization can effectively reduce the discharge temperature, make the compression process of the compressor tend to isothermal compression. Under rated conditions, a reduction in the droplet diameter from 0.25 mm to 0.15 mm reduced the discharge temperature of the compressor, improved the volume efficiency, and improved the adiabatic efficiency by 31 K, 2.6%, and 8.2%, respectively.
Keywords	Environmental sciences ; GE1-350
Subject code	690
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Influence of Different Nitrogen, Phosphorus, and Potassium Fertilizer Ratios on the Agronomic and Quality Traits of Foxtail Millet

Xing, Guofang / Ma, Junwei / Liu, Xiaojie / Lei, Biao / Wang, Guo / Hou, Siyu / Han, Yuanhuai

Agronomy. 2023 July 28, v. 13, no. 8

2023

Abstract: Foxtail millet is highly valued in China; however, its optimal fertilization parameters are unknown. This study investigated the effects of nitrogen (N), phosphorus (P), and potassium (K) fertilizer combinations on foxtail millet agronomic traits, ... ...

Abstract	Foxtail millet is highly valued in China; however, its optimal fertilization parameters are unknown. This study investigated the effects of nitrogen (N), phosphorus (P), and potassium (K) fertilizer combinations on foxtail millet agronomic traits, photosynthetic characteristics, yield, and quality to promote rational fertilizer application. Pot experiments were conducted using the “3414” fertilizer effect scheme and the representative crop variety was JG21, containing four NPK levels and 20 replicates per treatment, individually. The effects of N, P, and K levels on agronomic traits were analyzed during the jointing, heading, and filling stages. JG21 performed optimally under treatment with N₁₆₀P₉₀K₁₅₀ (T₆); the yield and fat content increased by 49.32% and 13% compared to the control. Correlation analysis revealed that N was significantly positively (negatively) correlated with the protein (amylose) content. P was significantly positively correlated with the fat and moisture content and K was correlated with the moisture, fat, and protein content, but was negatively with the amylose content. Overall, rational ratios of NPK fertilization improved foxtail millet yield and quality. Based on fuzzy comprehensive evaluation, the T₆ treatment (N₁₆₀P₉₀K₁₅₀) demonstrated the highest comprehensive effect among 13 NPK fertilizer combinations. Rational application of NPK in foxtail millet may improve agronomic performance by enhancing leaf photosynthetic efficiency and aboveground biomass accumulation.
Keywords	NPK fertilizers ; Setaria italica ; aboveground biomass ; agronomic traits ; agronomy ; amylose ; biomass production ; cultivars ; fertilizer application ; leaves ; lipid content ; nitrogen ; phosphorus ; photosynthesis ; potassium ; potassium fertilizers ; protein content ; water content ; China
Language	English
Dates of publication	2023-0728
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article ; Online
ZDB-ID	2607043-1
ISSN	2073-4395
ISSN	2073-4395
DOI	10.3390/agronomy13082005
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article ; Online: Layered double hydroxide nanosheets-built porous film-covered Au nanoarrays as enrichment and enhancement chips for efficient SERS detection of trace styrene.

Zhao, Zhipeng / Zhao, Qian / Zhou, Le / Wei, Yi / Lei, Biao / Zhang, Hongwen / Cai, Weiping

Journal of hazardous materials

2023 Volume 459, Page(s) 132156

Abstract: Styrene, a prevalent volatile organic compounds (VOCs), is very harmful to atmosphere and humans. Consequently, the development of efficient detection technologies for styrene is of high importance, which is still in challenge! In this work, we crafted a ...

Abstract	Styrene, a prevalent volatile organic compounds (VOCs), is very harmful to atmosphere and humans. Consequently, the development of efficient detection technologies for styrene is of high importance, which is still in challenge! In this work, we crafted a layered double hydroxide (LDH) porous film-coated gold nanoarray, designed to act as a surface enhanced Raman spectroscopy (SERS) chip for the efficient and portable detection of gaseous styrene. This chip features a covering layer composed of cross-linked LDH nanosheets, notable for their porous structure and high specific surface area. When the covering layer is 100-300 nm in thickness, this composite chip has significant enrichment effect and strong SERS performance to gaseous styrene with a lowest detectable concentration below 1 ppb (4.64 ×10
Language	English
Publishing date	2023-07-26
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2023.132156
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article: C-reactive protein to albumin ratio predict responses to programmed cell death-1 inhibitors in hepatocellular carcinoma patients.

Li, Bai-Bei / Chen, Lei-Jie / Lu, Shi-Liu / Lei, Biao / Yu, Gui-Lin / Yu, Shui-Ping

World journal of gastrointestinal oncology

2024 Volume 16, Issue 1, Page(s) 61–78

Abstract: Background: Over the years, programmed cell death-1 (PD-1) inhibitors have been routinely used for hepatocellular carcinoma (HCC) treatment and yielded improved survival outcomes. Nonetheless, significant heterogeneity surrounds the outcomes of most ... ...

Abstract	Background: Over the years, programmed cell death-1 (PD-1) inhibitors have been routinely used for hepatocellular carcinoma (HCC) treatment and yielded improved survival outcomes. Nonetheless, significant heterogeneity surrounds the outcomes of most studies. Therefore, it is critical to search for biomarkers that predict the efficacy of PD-1 inhibitors in patients with HCC. Aim: To investigate the role of the C-reactive protein to albumin ratio (CAR) in evaluating the efficacy of PD-1 inhibitors for HCC. Methods: The clinical data of 160 patients with HCC treated with PD-1 inhibitors from January 2018 to November 2022 at the First Affiliated Hospital of Guangxi Medical University were retrospectively analyzed. Results: The optimal cut-off value for CAR based on progression-free survival (PFS) was determined to be 1.20 using x-tile software. Cox proportional risk model was used to determine the factors affecting prognosis. Eastern Cooperative Oncology Group performance status [hazard ratio (HR) = 1.754, 95% confidence interval (95%CI) = 1.045-2.944, Conclusion: Overall, we reveal that the CAR is a potential predictor of short- and long-term prognosis in patients with HCC treated with PD-1 inhibitors. If further verified, CAR-based nomogram may increase the number of markers that predict individualized prognosis.
Language	English
Publishing date	2024-01-16
Publishing country	China
Document type	Journal Article
ZDB-ID	2573696-6
ISSN	1948-5204
ISSN	1948-5204
DOI	10.4251/wjgo.v16.i1.61
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article: Influence of clearance height on performance of water-lubricated single-screw air compressor

Li, Yanan / Zhi, Ruiping / Wu, Yuting / Wang, Jingfu / Lei, Biao / Shen, Lili

Energy. 2022 July 15, v. 251

2022

Abstract: Addressing the growing need of oil-free compressed air has drawn the development of the water-lubricated single-screw air compressor (WLSSAC). For WLSSAC, clearance height is an important design parameters relevant to compressor performance. In this ... ...

Abstract	Addressing the growing need of oil-free compressed air has drawn the development of the water-lubricated single-screw air compressor (WLSSAC). For WLSSAC, clearance height is an important design parameters relevant to compressor performance. In this study, a thermodynamic model of the working process of a WLSSAC is established in consideration of the viscous friction power consumption and mass transfer between water and wet air. The theoretical model is simulated by Matlab software, and the accuracy of the theoretical model is verified by experimental results. The influence of each leakage path on the rate of leakage flow, viscous friction power consumption, and efficiency are analyzed using the proposed model. The effects of clearance height on adiabatic efficiency, volumetric efficiency, and specific power are calculated and discussed. Results show that the viscous friction power consumption caused by wall velocity decreases gradually with the increase in clearance height, while the viscous friction power consumption caused by pressure difference increases gradually in each leakage path. With the increase in clearance height, the rate of leakage flow increases gradually, the adiabatic and volumetric efficiencies decrease gradually, and the specific power increases gradually. The clearance height is recommended to be 0.03–0.06 mm for the design of WLSSAC.
Keywords	air ; computer software ; energy ; energy use and consumption ; friction ; mass transfer ; theoretical models ; thermodynamic models
Language	English
Dates of publication	2022-0715
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2019804-8
ISSN	0360-5442 ; 0360-5442
ISSN (online)	0360-5442
ISSN	0360-5442
DOI	10.1016/j.energy.2022.123899
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Thermodynamic investigations on internal generator cooling for hermetic expanders in Organic Rankine Cycles

Lei, Biao / Yu, Hai-bin / Li, Guo-qiang / Wu, Yu-Ting / Wang, Wei

Energy. 2022 July 15, v. 251

2022

Abstract: Organic Rankine Cycle (ORC) technology is an effective technical path to realize power generation from low or medium grade energy. Utilizing hermetic expanders with internal generators has become an important development direction of ORC system because ... ...

Abstract	Organic Rankine Cycle (ORC) technology is an effective technical path to realize power generation from low or medium grade energy. Utilizing hermetic expanders with internal generators has become an important development direction of ORC system because the machines are easy to get full tightness. However, due to the high temperature of the gas in expander, it will be very difficult to cool the internal generators in hermetic expanders. This paper introduces three schemes for cooling the internal generators in hermetic expanders, and establishes corresponding thermodynamic models as well as quantitatively analyzes the influences of each cooling scheme on ORC system. The simulation results show that the spray cooling scheme has the least influence on the thermodynamic efficiency of the system whether R245fa or R123 is used as the working fluid, and the maximum thermodynamic efficiency drop of 0.21% caused by cooling the generator is much smaller than the other two schemes. In medium-high temperature conditions, both spray cooling and exhaust-spray cooling schemes can effectively reduce the generator temperature. However, the latter has a much larger impact on the thermodynamic efficiency of the system than the former one. The conclusions can provide a guide for the design of hermetic expanders.
Keywords	airtight storage ; cooling ; energy ; power generation ; temperature
Language	English
Dates of publication	2022-0715
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2019804-8
ISSN	0360-5442 ; 0360-5442
ISSN (online)	0360-5442
ISSN	0360-5442
DOI	10.1016/j.energy.2022.123992
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Performance limits of the single screw expander in organic Rankine cycle with ensemble learning and hyperdimensional evolutionary many-objective optimization algorithm intervention

Ping, Xu / Yang, Fubin / Zhang, Hongguang / Wang, Yan / Lei, Biao / Wu, Yuting

Energy. 2022 Apr. 15, v. 245

2022

Abstract: The operating performance of the expander, as the core component of the ORC system, directly determines the comprehensive performance of the system. Single screw expander (SSE) has received widespread attention due to its advantages such as large single- ... ...

Abstract	The operating performance of the expander, as the core component of the ORC system, directly determines the comprehensive performance of the system. Single screw expander (SSE) has received widespread attention due to its advantages such as large single-stage expansion pressure ratio, insensitivity to liquid, wide working range, and balanced forces. This study fully considers the strong coupling, high nonlinearity, large time variability and uncertainty between SSE performance evaluation indexes and operating parameters. On this basis, a scatter–bilinear interpolation hybrid feature selection approach is proposed, and the feature selection and analysis of the correlation degree among SSE performance evaluation indexes are conducted. In the high-dimensional space, the influence of operating parameters on different performance evaluation indexes is analyzed. Then, this study proposes the ensemble learning-driven non-dominated sorting genetic algorithm-III (NSGA-III) approach. An ensemble learning-driven NSGA-III model for SSE performance limit optimization is constructed on the basis of the scatter–bilinear interpolation hybrid feature selection method and the ensemble learning-driven NSGA-III approach. In the hyperdimensional space, the performance limits of SSE are obtained. When the comprehensive performance of SSE reaches its limit, the shaft efficiency, expansion pressure ratio, and power output are 53.71%, 7.76, and 10.83 kW, respectively. This research provides a reliable reference for analyzing, designing, and optimizing the SSE performance limits, and it also provides a direct guidance for obtaining the SSE performance limits in the ORC system.
Keywords	algorithms ; energy ; liquids ; models ; uncertainty
Language	English
Dates of publication	2022-0415
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2019804-8
ISSN	0360-5442 ; 0360-5442
ISSN (online)	0360-5442
ISSN	0360-5442
DOI	10.1016/j.energy.2022.123254
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: The prognostic value of fibrinogen to albumin ratio in malignant tumor patients: A meta-analysis.

Li, Baibei / Deng, Huachu / Lei, Biao / Chen, Leijie / Zhang, Xinyuan / Sha, Dingran

Frontiers in oncology

2022 Volume 12, Page(s) 985377

Abstract: Background: Recent studies have shown that the fibrinogen to albumin ratio (FAR) is closely related to the prognosis of various cancers. The aim of this systematic review and meta-analysis was to investigate the prognostic value of FAR in malignancies ... ...

Abstract	Background: Recent studies have shown that the fibrinogen to albumin ratio (FAR) is closely related to the prognosis of various cancers. The aim of this systematic review and meta-analysis was to investigate the prognostic value of FAR in malignancies based on the available evidence. Method: To systematically search the Cochrane Library, Embase, PubMed, Google Scholar, Baidu scholars, CNKI and VIP databases for relevant studies published before April 1, 2022, and to evaluate the fibrinogen-to-albumin ratio (FAR) and survival of patients with malignant tumors through a meta-analysis relationship between the results. Results. This meta-analysis included 19 eligible studies involving 5926 cancer patients. We found that high FAR was associated with poor overall survival (HR=2.25, 95%CI 1.86-2.74, p<0.001), recurrence-free survival (HR=2.29, 95%CI 1.91-2.76, P<0.001), progression-free survival (HR: 2.10, 95%CI 1.58-2.79, p<0.001), disease-free survival (HR=1.52, 95%CI 1.17-1.96, p=0.001), and time to recurrence (HR: 1.555, 95%CI 1.031-2.346, P=0.035) was significantly correlated. Conclusions: High FAR is significantly associated with poor clinical outcomes in cancer, suggesting that it may be an important predictor of prognosis in patients with malignancies.
Language	English
Publishing date	2022-09-29
Publishing country	Switzerland
Document type	Systematic Review
ZDB-ID	2649216-7
ISSN	2234-943X
ISSN	2234-943X
DOI	10.3389/fonc.2022.985377
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article: Facile Synthesis of ZnO/WO

Lei, Biao / Zhang, Hongwen / Zhao, Qian / Liu, Weiwei / Wei, Yi / Lu, Yanyan / Xiao, Tingting / Kong, Jinglin / Cai, Weiping

Nanomaterials (Basel, Switzerland)

2023 Volume 13, Issue 4

Abstract: Volatile organic compounds (VOCs) in indoor environments have typical features of multiple components, high concentration, and long duration. The development of gas sensors with high sensitivity to multiple VOCs is of great significance to protect human ... ...

Abstract	Volatile organic compounds (VOCs) in indoor environments have typical features of multiple components, high concentration, and long duration. The development of gas sensors with high sensitivity to multiple VOCs is of great significance to protect human health. Herein, we proposed a sensitive ZnO/WO
Language	English
Publishing date	2023-02-15
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662255-5
ISSN	2079-4991
ISSN	2079-4991
DOI	10.3390/nano13040733
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

To top

More links

Kategorien

Order via subito

Full text online

More links

Kategorien

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito