通过考察不同地区、不同年龄和不同性别受试者唇部皮肤基础状态,进行唇部生理参数的多维度分析和研究,并通过唇油对唇部皮肤的干预,来探究影响唇部皮肤性状的主要因素。用无创性评价方法测定了华东地区(73名)和华北地区(50名)受试者(18...通过考察不同地区、不同年龄和不同性别受试者唇部皮肤基础状态,进行唇部生理参数的多维度分析和研究,并通过唇油对唇部皮肤的干预,来探究影响唇部皮肤性状的主要因素。用无创性评价方法测定了华东地区(73名)和华北地区(50名)受试者(18~35岁73名,35~60岁50名;男性55名,女性68名)唇部下唇的水分含量、TEWL、光泽度、弹性、L^(*)a^(*)b^(*)值和纹理8个皮肤生理参数。研究结果表明,华东地区组受试者唇部基础状态的经皮水分散失(Trans Epidermal Water Loss,TEWL)值(51.99±17.37)、L*值(51.99±8.83)、b*值(15.40±1.56)和纹理值(15.10±6.43)分别显著高于华北地区组(P<0.05)。35~60岁组受试者唇部基础状态的水分含量(56.82±12.63)和皮肤弹性(0.78±0.18)显著高于18~35岁组(P<0.05)。男性组唇部基础状态的TEWL值(52.08±17.68)显著高于女性组(43.48±16.03)(P<0.05)。通过唇油对唇部皮肤的干预,与基础状态相比,受试者使用唇油后其唇部水分含量均是先降低后逐渐升高;TEWL值先显著性降低后逐渐增加;光泽度、弹性和纹理均是先增加后减小;皮肤色泽(L^(*)a^(*)b^(*)值)的变化不显著。由此可知,受试者唇部皮肤生理参数不仅受到地区、年龄以及性别的影响,还与受试者唇部基础状态及唇部产品的使用频率等因素相关。展开更多
The accurate knowledge of the thrust vector eccentricity and beam divergence characteristics of Hall thrusters are of significant engineering value for the beneficial integration and successful application of Hall thr...The accurate knowledge of the thrust vector eccentricity and beam divergence characteristics of Hall thrusters are of significant engineering value for the beneficial integration and successful application of Hall thrusters on spacecraft.For the characteristics of the plume bipolar diffusion due to the annular discharge channel of the Hall thruster,a Gaussian-fitted method for thrust vector deviation angle and beam divergence of Hall thrusters based on dual Faraday probe array planes was proposed in respect of the Hall thruster beam characteristics.The results show that the ratios of the deviation between the maximum and minimum values of the beam divergence angle and the thrust vector eccentricity angle using a Gaussian fit to the optimized Faraday probe dual plane to the mean value are 1.4%and 11.5%,respectively.The optimized thrust vector eccentricity angle obtained has been substantially improved,by approximately 20%.The beam divergence angle calculated using a Gaussian fitting to the optimized Faraday probe dual plane is approximately identical to the non-optimized one.The beam divergence and thrust vector eccentricity angles for different anode mass flow rates were obtained by averaging the beam divergence and thrust vector eccentricity angles calculated by the dual-plane,Gaussian-fitted ion current density method for different cross-sections.The study not only allows for an immediate and effective tool for determining the design of thrust vector adjustment mechanisms of spacecraft with different power Hall thrusters but also for characterizing the 3D spatial distribution of the Hall thruster plume.展开更多
A self-consistent fluid model is developed to investigate the radial distributions of dusty plasma parameters in a DC glow discharge,in which the extended fluid approach of plasma particles and the transport equations...A self-consistent fluid model is developed to investigate the radial distributions of dusty plasma parameters in a DC glow discharge,in which the extended fluid approach of plasma particles and the transport equations of dust particles are coupled.The electrical interaction between charged dust particles is considered in the model.The time evolution of radial distributions of dust density,plasma density,the radial component of electric field and the forces acting on dust particles when dust density tends to be stable,are obtained and analyzed under different discharge currents and dust particle radii.It is shown that the dust density structure is determined mainly by the radial electrostatic force,thermophoretic force and ion drag force in the discharge tube,and both discharge current and dust particle radius have an obvious effect on the transport processes of dust particles.The dust particles gather in the central region of the discharge tube for low discharge current and small dust radius,then dust voids are formed and become wider when the discharge current and dust radius increase.The plasma parameters in the dust gathering region are obviously affected by the dust particles due to the charging processes of electrons and ions to the dust surface.展开更多
Chinese traditional medicine Danshen is the radix of the perennial herbs of Salvia miltiorrhiza Bunge, which has a variety of pharmacological effects and is traditionally and extensively applied clinically to treat ca...Chinese traditional medicine Danshen is the radix of the perennial herbs of Salvia miltiorrhiza Bunge, which has a variety of pharmacological effects and is traditionally and extensively applied clinically to treat cardiovascular disorders. In this research, the genomic genes for tyrosine aminotransferase (TAT) of 38 cultivated populations of Danshen in China were cloned and bioinformatic analyses were conducted to reveal its genetic diversity and phylogeny. The full-length SmTAT was 2296 - 2444 bp including 6 exons (encoding 411 amino acids) and 5 introns. Overall, the SmTAT genes in cultivated Danshen populations are highly conserved with a relative low level of genetic diversity. The spliced exons (1236 bp) had 23 SNP variations with a rate of 1.86%, of which 22 occurred in the white flower S. miltiorrhiza Bge.f.alba population (W-SCHY-W-1) and led to 5 amino acid variations. The entire 290 SNP variations with a rate of 24% in the 5 introns occurred exclusively in W-SCHY-W-1. Phylogenetic trees based on the full-length, combined introns, the spliced exons, and the deduced amino acid sequences of SmTAT all showed a two-clade basic structure with W-SCHY-W-1 uniquely standing alone. The SmTAT gene of the white flower population (W-SCHY-W-1) is unique and especially rich in variations. The first time clarified genomic SmTAT gene structure and genetic diversity in cultivated Danshen populations laid an excellent foundation for further studies on the biosynthesis of bioactives and the molecular breeding of Danshen as well as in plant tyrosine metabolism.展开更多
文摘通过考察不同地区、不同年龄和不同性别受试者唇部皮肤基础状态,进行唇部生理参数的多维度分析和研究,并通过唇油对唇部皮肤的干预,来探究影响唇部皮肤性状的主要因素。用无创性评价方法测定了华东地区(73名)和华北地区(50名)受试者(18~35岁73名,35~60岁50名;男性55名,女性68名)唇部下唇的水分含量、TEWL、光泽度、弹性、L^(*)a^(*)b^(*)值和纹理8个皮肤生理参数。研究结果表明,华东地区组受试者唇部基础状态的经皮水分散失(Trans Epidermal Water Loss,TEWL)值(51.99±17.37)、L*值(51.99±8.83)、b*值(15.40±1.56)和纹理值(15.10±6.43)分别显著高于华北地区组(P<0.05)。35~60岁组受试者唇部基础状态的水分含量(56.82±12.63)和皮肤弹性(0.78±0.18)显著高于18~35岁组(P<0.05)。男性组唇部基础状态的TEWL值(52.08±17.68)显著高于女性组(43.48±16.03)(P<0.05)。通过唇油对唇部皮肤的干预,与基础状态相比,受试者使用唇油后其唇部水分含量均是先降低后逐渐升高;TEWL值先显著性降低后逐渐增加;光泽度、弹性和纹理均是先增加后减小;皮肤色泽(L^(*)a^(*)b^(*)值)的变化不显著。由此可知,受试者唇部皮肤生理参数不仅受到地区、年龄以及性别的影响,还与受试者唇部基础状态及唇部产品的使用频率等因素相关。
基金the Key Laboratory Funds for Science and Technology on Vacuum Technology and Physics Laboratory(No.HTKJ2022KL510002)the Military Test Instruments Program(No.2006ZCTF0054)。
文摘The accurate knowledge of the thrust vector eccentricity and beam divergence characteristics of Hall thrusters are of significant engineering value for the beneficial integration and successful application of Hall thrusters on spacecraft.For the characteristics of the plume bipolar diffusion due to the annular discharge channel of the Hall thruster,a Gaussian-fitted method for thrust vector deviation angle and beam divergence of Hall thrusters based on dual Faraday probe array planes was proposed in respect of the Hall thruster beam characteristics.The results show that the ratios of the deviation between the maximum and minimum values of the beam divergence angle and the thrust vector eccentricity angle using a Gaussian fit to the optimized Faraday probe dual plane to the mean value are 1.4%and 11.5%,respectively.The optimized thrust vector eccentricity angle obtained has been substantially improved,by approximately 20%.The beam divergence angle calculated using a Gaussian fitting to the optimized Faraday probe dual plane is approximately identical to the non-optimized one.The beam divergence and thrust vector eccentricity angles for different anode mass flow rates were obtained by averaging the beam divergence and thrust vector eccentricity angles calculated by the dual-plane,Gaussian-fitted ion current density method for different cross-sections.The study not only allows for an immediate and effective tool for determining the design of thrust vector adjustment mechanisms of spacecraft with different power Hall thrusters but also for characterizing the 3D spatial distribution of the Hall thruster plume.
基金supported by the Stable-Support Scientific Project of China Research Institute of Radiowave Propagation(No.132101W07)National Natural Science Foundation of China(No.12105251)National Key Laboratory Foundation Electromagnetic Environment(Nos.A382101001,A382101002 and A152101731-C02).
文摘A self-consistent fluid model is developed to investigate the radial distributions of dusty plasma parameters in a DC glow discharge,in which the extended fluid approach of plasma particles and the transport equations of dust particles are coupled.The electrical interaction between charged dust particles is considered in the model.The time evolution of radial distributions of dust density,plasma density,the radial component of electric field and the forces acting on dust particles when dust density tends to be stable,are obtained and analyzed under different discharge currents and dust particle radii.It is shown that the dust density structure is determined mainly by the radial electrostatic force,thermophoretic force and ion drag force in the discharge tube,and both discharge current and dust particle radius have an obvious effect on the transport processes of dust particles.The dust particles gather in the central region of the discharge tube for low discharge current and small dust radius,then dust voids are formed and become wider when the discharge current and dust radius increase.The plasma parameters in the dust gathering region are obviously affected by the dust particles due to the charging processes of electrons and ions to the dust surface.
基金supported by the National Natural Science Foundation of China(21971153 and 22371172)the Major Basic Research Projects of Shandong Provincial Natural Science Foundation(ZR2020ZD32)+1 种基金Taishan Scholars Climbing Program of Shandong Province,China Postdoctoral Science Foundation(2020M682225)the Natural Science Foundation of Shandong Province(ZR202102280580 and ZR202102210262)。
文摘Chinese traditional medicine Danshen is the radix of the perennial herbs of Salvia miltiorrhiza Bunge, which has a variety of pharmacological effects and is traditionally and extensively applied clinically to treat cardiovascular disorders. In this research, the genomic genes for tyrosine aminotransferase (TAT) of 38 cultivated populations of Danshen in China were cloned and bioinformatic analyses were conducted to reveal its genetic diversity and phylogeny. The full-length SmTAT was 2296 - 2444 bp including 6 exons (encoding 411 amino acids) and 5 introns. Overall, the SmTAT genes in cultivated Danshen populations are highly conserved with a relative low level of genetic diversity. The spliced exons (1236 bp) had 23 SNP variations with a rate of 1.86%, of which 22 occurred in the white flower S. miltiorrhiza Bge.f.alba population (W-SCHY-W-1) and led to 5 amino acid variations. The entire 290 SNP variations with a rate of 24% in the 5 introns occurred exclusively in W-SCHY-W-1. Phylogenetic trees based on the full-length, combined introns, the spliced exons, and the deduced amino acid sequences of SmTAT all showed a two-clade basic structure with W-SCHY-W-1 uniquely standing alone. The SmTAT gene of the white flower population (W-SCHY-W-1) is unique and especially rich in variations. The first time clarified genomic SmTAT gene structure and genetic diversity in cultivated Danshen populations laid an excellent foundation for further studies on the biosynthesis of bioactives and the molecular breeding of Danshen as well as in plant tyrosine metabolism.
