[Objectives]To study the effects of 12%chlorothalonil and 12%procymidone smoke agent on physiology and yield of quinoa in greenhouse.[Methods]The chlorophyll content and photosynthesis rate of quinoa were determined b...[Objectives]To study the effects of 12%chlorothalonil and 12%procymidone smoke agent on physiology and yield of quinoa in greenhouse.[Methods]The chlorophyll content and photosynthesis rate of quinoa were determined by using the conventional application method of smoke agent at the dosage of 3 kg/ha.Finally,the total yield and increased yield of quinoa were calculated.[Results]The chlorophyll content and photosynthesis rate of leaves were all increased by two kinds of smoke agents,and the photosynthesis rate was also increased significantly.[Conclusions]These two smoke agents can promote the growth of quinoa,including the increase of chlorophyll and the enhancement of photosynthesis,and its further mechanism needs to be further discussed.展开更多
In response to the demand for short-range detection of anti-smoke environment interference by laser fuzes,this study proposes a smoke environment simulation of non-uniform continuous point source diffusion and investi...In response to the demand for short-range detection of anti-smoke environment interference by laser fuzes,this study proposes a smoke environment simulation of non-uniform continuous point source diffusion and investigates an experimental laboratory smoke environment using an ammonium chloride smoke agent.The particle size distribution,composition,and mass flow distribution of the smoke were studied.Based on a discrete phase model and a kεturbulence model,a numerical simulation was developed to model the smoke generation and diffusion processes of the smoke agent in a confined space.The temporal and spatial distribution characteristics of the smoke mass concentration,velocity,and temperature in the space after smoke generation were analyzed,and the motion law governing the smoke diffusion throughout the entire space was summarized.Combined with the experimental verification of the smoke environment laboratory,the results showed that the smoke plume changed from fan-shaped to umbrella-shaped during smoke generation,and then continued to spread around.Meanwhile,the mass concentration of smoke in the space decreased from the middle outward;the changes in temperature and velocity were small and stable.In the diffusion stage(after 900 s),the mass concentration of smoke above 0.8 m was relatively uniform across an area of smoke that was 12 m thick.The concentration decreased over time,following a consistent decreasing trend,and the attenuation was negligible in a very short time.Therefore,this system was suitable for conducting experimental research on laser fuzes in a smoke environment.Owing to the stability of the equipment and facilities,the setup could reproduce the same experimental smoke environment by artificially controlling the smoke emission of the smoke agent.Overall,this work provides a theoretical reference for subsequent research efforts regarding the construction of uniform smoke environments and evaluating laser transmission characteristics in smoky environments.展开更多
The contradiction between flammability and packing density is the technical bottleneck for combustible smoke agent.Herein,polyurethane(PU)foams with flammability and resilience were prepared with polyol and isocyanate...The contradiction between flammability and packing density is the technical bottleneck for combustible smoke agent.Herein,polyurethane(PU)foams with flammability and resilience were prepared with polyol and isocyanate as raw materials by chemical foaming method,then compounded with metal powders,polytetrafluoroethylene(PTFE),phthalic annychide(PA),etc.in a certain proportion and pressed into pyrotechnic grain to obtain eco-friendly combustion aerosols with compact density of about1.15 g/cm^(3).The resulting combustion smoke agent combined the advantages of PU foam and pyrotechnic with easy ignition,large smoke production,long duration and low environmental pollution.The transmittance of aerosols for 532 nm and 1064 nm lasers was close to 0,and the EMI SE reached up to65 d B and 35 d B in GPS band and X band,respectively.In addition,the resulting pyrotechnic grains exhibited good mechanical strength and elasticity for sample 1:25,with a compressive strength of22 MPa and an elastic modulus of 195 MPa.The resulting combustion smoke agent is expected to play a potential role in the field of electromagnetic damage and protection.展开更多
为了解三种消毒方法对室内空气消毒效果,采用现场试验方法对二氧化氯气溶胶喷雾、臭氧熏蒸和氯溴异氰尿酸烟雾剂熏蒸等三种方法进行了比较观察。结果,用50 mg/L二氧化氯按20 m l/m3用量进行气溶胶喷雾作用90 m in,对室内空气中自然菌消...为了解三种消毒方法对室内空气消毒效果,采用现场试验方法对二氧化氯气溶胶喷雾、臭氧熏蒸和氯溴异氰尿酸烟雾剂熏蒸等三种方法进行了比较观察。结果,用50 mg/L二氧化氯按20 m l/m3用量进行气溶胶喷雾作用90 m in,对室内空气中自然菌消亡率91.58%。用10 mg/m3臭氧熏蒸作用60 m in,对空气中自然菌消亡率为82.00%。用氯溴异氰尿酸烟雾剂按照0.3 g/m3用量进行烟雾熏蒸作用120 m in,对空气中自然菌消亡率为80.63%。结论,三种消毒法对空气中自然菌都有杀灭作用,但以二氧化氯气溶胶喷雾法效果最好且用药量低。展开更多
基金Supported by Introduction and Demonstration Project of Forage Quinoa Germplasm Resources(2019YX019A)Project of Hebei Academy of Agricultural and Forestry Sciences(Basic Scientific Research Fund 2018030302Innovation Project F19R494004-01-5).
文摘[Objectives]To study the effects of 12%chlorothalonil and 12%procymidone smoke agent on physiology and yield of quinoa in greenhouse.[Methods]The chlorophyll content and photosynthesis rate of quinoa were determined by using the conventional application method of smoke agent at the dosage of 3 kg/ha.Finally,the total yield and increased yield of quinoa were calculated.[Results]The chlorophyll content and photosynthesis rate of leaves were all increased by two kinds of smoke agents,and the photosynthesis rate was also increased significantly.[Conclusions]These two smoke agents can promote the growth of quinoa,including the increase of chlorophyll and the enhancement of photosynthesis,and its further mechanism needs to be further discussed.
基金the Central University Special Funding for Basic Scientific Research(Grant No.30918012201)the Foundation of JWKJW Field(Grant 2020-JCJQ-JJ-392)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(Grant No.KYCX20_0315).
文摘In response to the demand for short-range detection of anti-smoke environment interference by laser fuzes,this study proposes a smoke environment simulation of non-uniform continuous point source diffusion and investigates an experimental laboratory smoke environment using an ammonium chloride smoke agent.The particle size distribution,composition,and mass flow distribution of the smoke were studied.Based on a discrete phase model and a kεturbulence model,a numerical simulation was developed to model the smoke generation and diffusion processes of the smoke agent in a confined space.The temporal and spatial distribution characteristics of the smoke mass concentration,velocity,and temperature in the space after smoke generation were analyzed,and the motion law governing the smoke diffusion throughout the entire space was summarized.Combined with the experimental verification of the smoke environment laboratory,the results showed that the smoke plume changed from fan-shaped to umbrella-shaped during smoke generation,and then continued to spread around.Meanwhile,the mass concentration of smoke in the space decreased from the middle outward;the changes in temperature and velocity were small and stable.In the diffusion stage(after 900 s),the mass concentration of smoke above 0.8 m was relatively uniform across an area of smoke that was 12 m thick.The concentration decreased over time,following a consistent decreasing trend,and the attenuation was negligible in a very short time.Therefore,this system was suitable for conducting experimental research on laser fuzes in a smoke environment.Owing to the stability of the equipment and facilities,the setup could reproduce the same experimental smoke environment by artificially controlling the smoke emission of the smoke agent.Overall,this work provides a theoretical reference for subsequent research efforts regarding the construction of uniform smoke environments and evaluating laser transmission characteristics in smoky environments.
基金financial support from the Fundamental Research Funds for the Central Universities(No.3090011182152)。
文摘The contradiction between flammability and packing density is the technical bottleneck for combustible smoke agent.Herein,polyurethane(PU)foams with flammability and resilience were prepared with polyol and isocyanate as raw materials by chemical foaming method,then compounded with metal powders,polytetrafluoroethylene(PTFE),phthalic annychide(PA),etc.in a certain proportion and pressed into pyrotechnic grain to obtain eco-friendly combustion aerosols with compact density of about1.15 g/cm^(3).The resulting combustion smoke agent combined the advantages of PU foam and pyrotechnic with easy ignition,large smoke production,long duration and low environmental pollution.The transmittance of aerosols for 532 nm and 1064 nm lasers was close to 0,and the EMI SE reached up to65 d B and 35 d B in GPS band and X band,respectively.In addition,the resulting pyrotechnic grains exhibited good mechanical strength and elasticity for sample 1:25,with a compressive strength of22 MPa and an elastic modulus of 195 MPa.The resulting combustion smoke agent is expected to play a potential role in the field of electromagnetic damage and protection.
文摘为了解三种消毒方法对室内空气消毒效果,采用现场试验方法对二氧化氯气溶胶喷雾、臭氧熏蒸和氯溴异氰尿酸烟雾剂熏蒸等三种方法进行了比较观察。结果,用50 mg/L二氧化氯按20 m l/m3用量进行气溶胶喷雾作用90 m in,对室内空气中自然菌消亡率91.58%。用10 mg/m3臭氧熏蒸作用60 m in,对空气中自然菌消亡率为82.00%。用氯溴异氰尿酸烟雾剂按照0.3 g/m3用量进行烟雾熏蒸作用120 m in,对空气中自然菌消亡率为80.63%。结论,三种消毒法对空气中自然菌都有杀灭作用,但以二氧化氯气溶胶喷雾法效果最好且用药量低。
