This paper examines the stability condition of a jointed rock slope in the south western region of Saudi Arabia using deterministic and probabilistic approaches,under both dry and wet conditions.The study area is char...This paper examines the stability condition of a jointed rock slope in the south western region of Saudi Arabia using deterministic and probabilistic approaches,under both dry and wet conditions.The study area is characterized by complex geology in rugged terrains.The stability analysis is carried out using the code FLAC3D to generate a 3-dimensional,ubiquitous joint model,to determine the influence of the dominant,unfavourable discontinuity orientation with respect to the slope face.The deterministic analysis is first implemented using the mean values of the selected random variables,namely the dip,dip direction and friction angle of the dominant discontinuity set,and the stability condition is assessed with a factor of safety based on the classical frictional joint constitutive model.A Box-Behnken design(BBD)approach is then adopted to create the surface response function as a second order polynomial for the factor of safety.To do so,fifteen FLAC3D models are generated in accordance with the BBD.Based on this,10,000 simulations of different slope realizations are carried out using Monte-Carlo simulation technique,and the probability of unsatisfactory of performance of the rock slope is assessed.It is shown that the probabilistic approach provides more insight and confidence in the stability condition of the rock slope,both under dry and steady state heavy rainfall conditions.A discussion is presented on the significance of accepting lower safety factors when heavy rainfall conditions are encountered.展开更多
The umbilical cable is a vital component of subsea production systems that provide power,chemical agents,control signals et al.,and its requirement for reliability is exceedingly high.However,as the umbilical cable is...The umbilical cable is a vital component of subsea production systems that provide power,chemical agents,control signals et al.,and its requirement for reliability is exceedingly high.However,as the umbilical cable is a composite structure comprising multiple functional units,the reliability analysis of such cables involves numerous parameters that can impact calculation efficiency.In this paper,the reliability analysis of a new kind of umbilical cable with carbon fiber rod under tension is analyzed.The global dynamic analytical model is first established to determine the maximum tension load,then the local analytical model of umbilical cable including each unit are constructed by finite element method(FEM).Based on the mechanical analytical model,the reliability of umbilical cable under tension load is studied using response surface method(RSM)and Monte Carlo method.During the calculation process,a new tangent plane sampling method to calculate the response surface function(RSF)is proposed in this paper,which could make sampling points faster come close to the RSF curve,and it is proved that the calculation efficiency increases about 33%comparing with traditional method.展开更多
The biomass of petroleum-degrading bacteria, such as Halomonas spp., is crucial to the alleviation of severe oil spills through bioremediation. In this paper, the bacterium(HDMP1) was isolated and identified. Growth f...The biomass of petroleum-degrading bacteria, such as Halomonas spp., is crucial to the alleviation of severe oil spills through bioremediation. In this paper, the bacterium(HDMP1) was isolated and identified. Growth factors were analysed and optimised through the single-factor experiments, the factor analysis(FA), the principal component analysis(PCA), and the response surface methodology(RSM). Results indicated that HDMP1 was identified as genus Halomonas. In the single-factor experiments, the range of suitable growth conditions for HDMP1 covered: a salt concentration of 2%-4%, a medium pH value of approximately 9, an inoculum concentration of 1.0%, a substrate concentration of 1.0%-1.4%, and a rotation rate of 140 r/min. The evaluation by FA and PCA indicated that three significant growth factors were the salt concentration, the pH value, and the rotation rate. A maximum biomass of HDMP1 was obtained under the conditions covering a salt concentration of 3.5%, a medium pH of 8, and a rotation rate of 151 r/min by optimization.展开更多
为促进枸杞种子的萌发,探究介质阻挡放电(DBD)产生低温等离子体(NTP)对枸杞种子萌发的影响及最佳处理工艺。以枸杞种子为研究对象,采用自制针板式介质阻挡放电等离子体反应器对枸杞种子进行处理。固定针板电极距离样液的距离为5 mm,考...为促进枸杞种子的萌发,探究介质阻挡放电(DBD)产生低温等离子体(NTP)对枸杞种子萌发的影响及最佳处理工艺。以枸杞种子为研究对象,采用自制针板式介质阻挡放电等离子体反应器对枸杞种子进行处理。固定针板电极距离样液的距离为5 mm,考察在不同放电时间、放电电压及电解质种类情况下介质阻挡放电等离子体对枸杞种子萌发的影响。在单因素实验的基础上,以种子发芽率、活力指数为指标,采用响应面优化枸杞种子处理工艺,通过种皮形貌观察与接触角测定,初步探讨了介质阻挡放电等离子体对种皮结构和性质的影响。结果表明:在放电时间为1 h、放电电压为35 k V、150 m L浓度为0.2%的Na_(2)SO_(4)水样条件下,处理后的枸杞种子发芽率为86.67%,未处理的枸杞种子的发芽率为33.33%,发芽率增加了53.34%;活力指数为600.58,没有处理过的种子的活力指数为206.9,活力指数上升了65.55%。处理后种皮变得平整、纹理模糊,种子亲水性增强。本研究提供了一种清洁、高效提高植物种子萌发率的方法。展开更多
以无花果为主要原料,搭配多种果蔬杂粮,采用DPPH自由基清除能力、ABTS自由基清除能力、铁离子还原能力(FRAP法)以及感官评价为检测指标,用总评归一法计算综合得分,并通过Plackett-Burman实验和响应面实验优化主辅料配方制成高抗氧化能...以无花果为主要原料,搭配多种果蔬杂粮,采用DPPH自由基清除能力、ABTS自由基清除能力、铁离子还原能力(FRAP法)以及感官评价为检测指标,用总评归一法计算综合得分,并通过Plackett-Burman实验和响应面实验优化主辅料配方制成高抗氧化能力的无花果代餐粉。结果表明:最优主料配方为无花果、桑葚、山药质量比为7.10∶5.00∶3.00(以15.00 g代餐粉主料计)。高抗氧化能力无花果代餐粉最优配方为主料、南瓜、黑芝麻、赤小豆、糙米质量比为15.00∶9.10∶1.40∶3.00∶1.40(以30.00 g代餐粉计),此时代餐粉清除DPPH自由基的能力为705.73μg Trolox/mL、总抗氧化能力(ABTS法)为9.89 mM TEAC、总抗氧化能力(FRAP法)为12.54 mM FeSO 4。总评归一法进行综合抗氧化能力得分达到94.83,感官评分为78.25,综合得分为85.04。展开更多
基金financially supported by the Saudi Geological Survey through a doctoral fellowship at McGill University
文摘This paper examines the stability condition of a jointed rock slope in the south western region of Saudi Arabia using deterministic and probabilistic approaches,under both dry and wet conditions.The study area is characterized by complex geology in rugged terrains.The stability analysis is carried out using the code FLAC3D to generate a 3-dimensional,ubiquitous joint model,to determine the influence of the dominant,unfavourable discontinuity orientation with respect to the slope face.The deterministic analysis is first implemented using the mean values of the selected random variables,namely the dip,dip direction and friction angle of the dominant discontinuity set,and the stability condition is assessed with a factor of safety based on the classical frictional joint constitutive model.A Box-Behnken design(BBD)approach is then adopted to create the surface response function as a second order polynomial for the factor of safety.To do so,fifteen FLAC3D models are generated in accordance with the BBD.Based on this,10,000 simulations of different slope realizations are carried out using Monte-Carlo simulation technique,and the probability of unsatisfactory of performance of the rock slope is assessed.It is shown that the probabilistic approach provides more insight and confidence in the stability condition of the rock slope,both under dry and steady state heavy rainfall conditions.A discussion is presented on the significance of accepting lower safety factors when heavy rainfall conditions are encountered.
基金Financial support for this research was provided by the National Natural Science Foundation of China (Grant No.52222111)。
文摘The umbilical cable is a vital component of subsea production systems that provide power,chemical agents,control signals et al.,and its requirement for reliability is exceedingly high.However,as the umbilical cable is a composite structure comprising multiple functional units,the reliability analysis of such cables involves numerous parameters that can impact calculation efficiency.In this paper,the reliability analysis of a new kind of umbilical cable with carbon fiber rod under tension is analyzed.The global dynamic analytical model is first established to determine the maximum tension load,then the local analytical model of umbilical cable including each unit are constructed by finite element method(FEM).Based on the mechanical analytical model,the reliability of umbilical cable under tension load is studied using response surface method(RSM)and Monte Carlo method.During the calculation process,a new tangent plane sampling method to calculate the response surface function(RSF)is proposed in this paper,which could make sampling points faster come close to the RSF curve,and it is proved that the calculation efficiency increases about 33%comparing with traditional method.
基金funded by the National Natural Science Foundation of China(Grant No.51408347)the Open Research Fund Program of Shandong Key Laboratory of Eco-Environmental Science for Yellow River Delta(Binzhou University)(2019KFJJ02)+1 种基金the Major Science and Technology Innovation Projects in Shandong Province(2019JZZY020808)the SDUST Graduate Technology Innovation Project(SDKDYC190321)
文摘The biomass of petroleum-degrading bacteria, such as Halomonas spp., is crucial to the alleviation of severe oil spills through bioremediation. In this paper, the bacterium(HDMP1) was isolated and identified. Growth factors were analysed and optimised through the single-factor experiments, the factor analysis(FA), the principal component analysis(PCA), and the response surface methodology(RSM). Results indicated that HDMP1 was identified as genus Halomonas. In the single-factor experiments, the range of suitable growth conditions for HDMP1 covered: a salt concentration of 2%-4%, a medium pH value of approximately 9, an inoculum concentration of 1.0%, a substrate concentration of 1.0%-1.4%, and a rotation rate of 140 r/min. The evaluation by FA and PCA indicated that three significant growth factors were the salt concentration, the pH value, and the rotation rate. A maximum biomass of HDMP1 was obtained under the conditions covering a salt concentration of 3.5%, a medium pH of 8, and a rotation rate of 151 r/min by optimization.
文摘为促进枸杞种子的萌发,探究介质阻挡放电(DBD)产生低温等离子体(NTP)对枸杞种子萌发的影响及最佳处理工艺。以枸杞种子为研究对象,采用自制针板式介质阻挡放电等离子体反应器对枸杞种子进行处理。固定针板电极距离样液的距离为5 mm,考察在不同放电时间、放电电压及电解质种类情况下介质阻挡放电等离子体对枸杞种子萌发的影响。在单因素实验的基础上,以种子发芽率、活力指数为指标,采用响应面优化枸杞种子处理工艺,通过种皮形貌观察与接触角测定,初步探讨了介质阻挡放电等离子体对种皮结构和性质的影响。结果表明:在放电时间为1 h、放电电压为35 k V、150 m L浓度为0.2%的Na_(2)SO_(4)水样条件下,处理后的枸杞种子发芽率为86.67%,未处理的枸杞种子的发芽率为33.33%,发芽率增加了53.34%;活力指数为600.58,没有处理过的种子的活力指数为206.9,活力指数上升了65.55%。处理后种皮变得平整、纹理模糊,种子亲水性增强。本研究提供了一种清洁、高效提高植物种子萌发率的方法。
文摘以无花果为主要原料,搭配多种果蔬杂粮,采用DPPH自由基清除能力、ABTS自由基清除能力、铁离子还原能力(FRAP法)以及感官评价为检测指标,用总评归一法计算综合得分,并通过Plackett-Burman实验和响应面实验优化主辅料配方制成高抗氧化能力的无花果代餐粉。结果表明:最优主料配方为无花果、桑葚、山药质量比为7.10∶5.00∶3.00(以15.00 g代餐粉主料计)。高抗氧化能力无花果代餐粉最优配方为主料、南瓜、黑芝麻、赤小豆、糙米质量比为15.00∶9.10∶1.40∶3.00∶1.40(以30.00 g代餐粉计),此时代餐粉清除DPPH自由基的能力为705.73μg Trolox/mL、总抗氧化能力(ABTS法)为9.89 mM TEAC、总抗氧化能力(FRAP法)为12.54 mM FeSO 4。总评归一法进行综合抗氧化能力得分达到94.83,感官评分为78.25,综合得分为85.04。
