Investigations of bubble size distribution on swirl effervescent atomizer flotation

Liansheng Liu,Jun Xie,Xuanchen Liu,Huiru Qu,Fang Zhao,Runze Duan 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-

Atomizer flotation has the advantages of low cost, low energy consumption, adjustable, and long cycle lifein industrial applications. The bubble diameter is an important parameter for floatation. The smaller thebubble diameter, the better the flotation effect. However, the bubble diameter produced by the atomizerduring flotation separation is large at present. In this paper, a swirl effervescent atomizer is designed andexperimental diagnosis through a spray measurement system and submerged spray visualization system. The diameter and size distribution of bubbles in 5 mm from the atomizer outlet to the jet cross-sectionspray were discussed. The results showed that the swirl effervescent atomizer obtained a fine Sautermean diameter (SMD is 13–25 lm) compared with the traditional atomizer. Three flow patterns wereobserved at the submerged spray system: large bubbly flow, discrete bubbly flow, and slug flow. A statisticalmethod of bubbles under high injection pressure was proposed. The effects of the operating conditionsof the effervescent atomizer on the bubble diameter were investigated. The average bubblediameter decreased with the increase in injection pressure and gas–liquid mass flow ratios (GLR). However, with the GLR being increased to 0.15, the influence of injection pressure on bubble diameterwas reduced. The backpressures (Liquid level heights) have less effect on bubbles compared with injectionpressure and GLR. This paper has great significance for the sustainable development of the atomizerin the flotation separation application.

Panaxadiol saponins treatment caused the subtle variations in the global transcriptional state of Asiatic corn borer, Ostrinia furnacalis

Liu, Shuangli,Xu, Yonghua,Gao, Yugang,Zhao, Yan,Zhang, Aihua,Zang, Liansheng,Wu, Chunsheng,Zhang, Lianxue The Korean Society of Ginseng 2020 Journal of Ginseng Research Vol.44 No.1

Background: The lepidopteran Asiatic corn borer (ACB), Ostrinia furnacalis (Guenee), has caused huge economic losses throughout the Asian-Western Pacific region. Usually, chemical pesticides are used for the control, but excessive use of pesticides has caused great harm. Therefore, the inartificial ecotypic pesticides to ACB are extremely essential. In our previous study, we found that panaxadiol saponins (PDS) can effectively reduce the harm of ACB by causing antifeedant activity. Therefore, it is necessary to reveal the biological molecular changes in ACB and the functionary mechanism of PDS. Methods: We analyzed the global transcription of ACB with different PDS concentration treatment (5 mg/mL, 10 mg/mL, and 25 mg/mL) by high-throughput sequencing and de novo transcriptome assembly method. Results: PDS treatment could cause the changes of many gene expressions which regulate its signal pathways. The genes in peroxisome proliferator-activated receptor (PPAR) signaling pathway were significantly downregulated, and then, the downstream fatty acid degradation pathway had also been greatly affected. Conclusion: Through this experiment, we hypothesized that the occurrence of antifeedant action of ACB is because the PDS brought about the downregulation of FATP and FABP, the key regulators in the PPAR, and the downregulation of FATP and FABP exerts further effects on the expression of SCD-1, ACBP, LPL, SCP-X, and ACO, which leads to the disorder of PPAR signaling pathway and the fatty acid degradation pathway. Not only that, PDS treatment leads to enzyme activity decrease by inhibiting the expression of genes associated with catalytic activity, such as cytochrome P450 and other similar genes.

Panaxadiol saponins treatment caused the subtle variations in the global transcriptional state of Asiatic corn borer, Ostrinia furnacalis

Shuangli Liu,Yonghua Xu,Yugang Gao,Yan Zhao,Aihua Zhang,Liansheng Zang,Chunsheng Wu,Lianxue Zhang 고려인삼학회 2020 Journal of Ginseng Research Vol.44 No.1

Background: The lepidopteran Asiatic corn borer (ACB), Ostrinia furnacalis (Guenee), has caused hugeeconomic losses throughout the Asian-Western Pacific region. Usually, chemical pesticides are used forthe control, but excessive use of pesticides has caused great harm. Therefore, the inartificial ecotypicpesticides to ACB are extremely essential. In our previous study, we found that panaxadiol saponins(PDS) can effectively reduce the harm of ACB by causing antifeedant activity. Therefore, it is necessary toreveal the biological molecular changes in ACB and the functionary mechanism of PDS. Methods: We analyzed the global transcription of ACB with different PDS concentration treatment (5 mg/mL, 10 mg/mL, and 25 mg/mL) by high-throughput sequencing and de novo transcriptome assemblymethod. Results: PDS treatment could cause the changes of many gene expressions which regulate its signalpathways. The genes in peroxisome proliferatoreactivated receptor (PPAR) signaling pathway weresignificantly downregulated, and then, the downstream fatty acid degradation pathway had also beengreatly affected. Conclusion: Through this experiment, we hypothesized that the occurrence of antifeedant action of ACBis because the PDS brought about the downregulation of FATP and FABP, the key regulators in the PPAR,and the downregulation of FATP and FABP exerts further effects on the expression of SCD-1, ACBP, LPL,SCP-X, and ACO, which leads to the disorder of PPAR signaling pathway and the fatty acid degradationpathway. Not only that, PDS treatment leads to enzyme activity decrease by inhibiting the expression ofgenes associated with catalytic activity, such as cytochrome P450 and other similar genes.

A Method Based on Spectrum Superposition for Minimizing the Hazards of Blasting Vibration

Tiejun Tao,Sipeng Wan,Liansheng Liu,Tongyan Pan 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.5

The selection of delay time will directly affect the effect of vibration reduction in millisecond delay blasting. The commonly used frequency spectrum control methods have some problems such as the difficulty of seed wave selection and the complexity of nonlinear superposition model. Based on the principle of waveform linear superposition, this study proposes a new spectrum superposition method for minimizing the vibration hazards in an open deep-hole bench blasting. This method, with no need to select the seed waves, mainly uses the ratio of the Fourier spectrum of the combined vibration waveform and the single hole vibration waveform to quantify the suppressed vibration. By defining the suppression ratio K, the suppression ratio with frequency range of 10 − 60 Hz under different delay times was calculated, and the theoretical optimal vibration reduction delay time value of 10 − 15 ms was given. A high precision digital electronic detonator was used to verify the proposed spectrum superposition method. The test results show that the best delay time of field vibration reduction is 5 − 10 ms, which is lower than the theoretical best delay time of 10 − 15 ms. It is the authors’ belief that this phenomenon is mainly caused by the joints and cracks in the rock mass, which will prolong the actual superposition time of blasting seismic waves between adjacent holes. In addition, it is found that there is a negative correlation between the delay time and the main vibration frequency, which is mainly caused by the low-pass filtering characteristic of rock medium. In order to minimize the probability of resonance failure, an optimal delay of 5 ms based on the main vibration frequency was given.

Effects of inlet working condition and heat load on supercritical CO2 compressor performance

Pei Jinze,Zhao Yuanyang,Zhao Mingran,Liu Guangbin,Yang Qichao,Li Liansheng 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.8

The supercritical carbon dioxide (sCO2) Brayton power cycle is more effective than the conventional power cycle and is more widely applicable to heat sources. The inlet working conditions of the compressor have a higher influence on their operating performance because the thermophysical properties of the CO2 vary dramatically close to the critical point. The flow in the sCO2 compressor is simulated and the compressor performance is analyzed. The results show that the sCO2 centrifugal compressor operates outside of its intended parameters due to the change in inlet temperature. The sCO2 compressor requires more power as the inlet temperature increases. The compressor power is 582 kW when the inlet temperature is at 304 K. But the power is doubled when the inlet temperature increases to 314 K, and the change in the isentropic efficiency is within 5%. The increase in the inlet temperature significantly reduces the risk of condensation in centrifugal compressors. When the heat load of the sCO2 power system changes, the inlet pressure to the turbine can be kept constant by regulating the rotational speed of compressors. With the increase in rotational speed, the incidence loss and condensation risk increase

Rapid Detection of Vibrio parahaemolyticus Strains and Virulent Factors by Loop-mediated Isothermal Amplification Assays

Xihong Zhao,Li Wang,Jin Chu,Yanyan Li,Yanmei Li,Lin Li,Mark E. Shirtliff,Xiaowei He,Yao Liu,Jihua Wang,Liansheng Yang,Zhenbo Xu 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.5

A loop-mediated isothermal amplification (LAMP) method for rapid detection of the foodborne Vibrio parahaemolyticus strains and related virulent factors had been developed and evaluated in this study. Six primers, including outer primers, inner primers, and loop primers, were specially designed for recognizing 8 distinct sequences on 3 target genes, which were tlh, tdh, and trh. The detection limits were found to be 100, 100 fg, and 1 pg DNA/tube for tlh, tdh, and trh, respectively. Application of LAMP assays were performed on 368 foodborne V. parahaemolyticus strains, the sensitivities of LAMP assays for the tlh, tdh, and trh were 100, 95.6, and 96.4%, and the negative predictive values (NPV) were 100, 84.7, and 93.1%, respectively; with a 100% specificity and positive predictive value (PPV) for all 3 target genes.

Development and Application of a Rapid and Simple Loop-mediated Isothermal Amplification Method for Food-borne Salmonella Detection

Xihong Zhao,Li Wang,Jin Chu,Yanmei Li,Yanyan Li,Zhenbo Xu,Lin Li,Mark E. Shirtliff,Xiaowei He,Yao Liu,Jihua Wang,Liansheng Yang 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.6

A loop-mediated isothermal amplification (LAMP) method for rapid detection of the food-borne Salmonella strains had been developed and evaluated in this study. The optimal reaction condition was found to be 65℃ for 45 min, with the detection limit as 1 pg DNA/tube and 100 CFU/reaction. Application of LAMP assays was performed on 214 food-borne Salmonella strains using a rapid procedure and easy result confirmation, where the specificity of LAMP and polymerase chain reaction (PCR)assays was 97.7% (209/214) and 91.6% (196/214),respectively; with a 100% specificity for both assays.