Last Sunday,I felt very hungry when I got up late.There was no food in the fridge,so l decided to cook noodles for me①.First,I filled the pot with water and put it on the stove.I waited patiently for the water to boi...Last Sunday,I felt very hungry when I got up late.There was no food in the fridge,so l decided to cook noodles for me①.First,I filled the pot with water and put it on the stove.I waited patiently for the water to boil.Then,I put the noodles into the boiling water.Next,I added some vegetables,an egg,and a little salt.展开更多
Inside the production workshop of a food processing enterprise under Jiangsu Province’s Sheyang Rice Group,rice harvested from Sheyang County’s green cultivation bases moves smoothly along the assembly line.Followin...Inside the production workshop of a food processing enterprise under Jiangsu Province’s Sheyang Rice Group,rice harvested from Sheyang County’s green cultivation bases moves smoothly along the assembly line.Following raw material processing,enzymatic hydrolysis,and blending,the rice is converted into a liquid product and packaged in easy-open cans.展开更多
[Objective] The experiment aimed to study the growth characteristics of hydroponic bowl lotus. [Method] The lotus variety Hongxia was chosen as the experimental material. Two treatments, hydroponics and soil culture w...[Objective] The experiment aimed to study the growth characteristics of hydroponic bowl lotus. [Method] The lotus variety Hongxia was chosen as the experimental material. Two treatments, hydroponics and soil culture were set to measure their photosynthetic indices, chlorophyll content and root vigor, and to observe their leaf tissue structure and stomatal characteristics. [Result] The findings indicated that there are no differences in the leaf physiological indices between bowl lotus under hydroponics and soil culture, while the leaf stomata of hydroponic bowl lotus is bigger and its amount is larger than that of soil-culture bowl lotus. At the same time, the ratio of the palisade tissue thickness to spongy tissue thickness is small,and its leaf tissue structure is loose. The root vigor of hydroponic bowl lotus reached its summit earlier, then began to drop. Whereas, the root activity of soil-culture lotus sustained increasing, with vigorous growth. [Conclusion] Therefore, it indicated that hydroponic bowl lotus can adapt to the aquatic-culture environment well and quickly, meanwhile, it also enters into its aging period quickly and its growth cycle gets shorter.展开更多
The conjugated polycycles show excellent optical and electrical properties that are suitable for application in various organic electronics.While most of attentions have been paid to polycycles having planar π-conjug...The conjugated polycycles show excellent optical and electrical properties that are suitable for application in various organic electronics.While most of attentions have been paid to polycycles having planar π-conjugated system,the curved polycycles seem amazing due to their unique physical and chemical features.The non-planar conjugated polycycles have been created with the geometries of bracelet,saddle,bowl,Mobius band,helicenes,etc.Among them,the bowl-shaped one is of growing interest owing to the multidiscipline applications such as synthetic intermediates for end-cap of carbon nanotube,coordination with metal ions,encapsulation of fullerenes,and fabrication of electronic devices.In this paper,we summarize the recent advances on the chemistry of the bowl-shaped conjugated polycycles,particularly on their synthesis and the further chemical modifications toward organic functional materials.展开更多
In this paper, electromagnetic poly（3,4-ethylenedioxythiophene）/γ-Fe2O3 （PEDOT/γ-Fe2O3 ） micro-bowls, 1-2 gm in diameter, were prepared by a simple environment-friendly process. In this method, the aqueous solu...In this paper, electromagnetic poly（3,4-ethylenedioxythiophene）/γ-Fe2O3 （PEDOT/γ-Fe2O3 ） micro-bowls, 1-2 gm in diameter, were prepared by a simple environment-friendly process. In this method, the aqueous solution of cetyltrimethylammonium bromide （CTAB） instead of any organic solvent was used. FeC13 acted as a source of FeIII for the formation of γ-Fe2O3 and as an oxidant for the polymerization of 3,4-ethylenedioxythiophene （EDOT）. The bowl-shaped morphology of PEDOT/γ-Fe2O3 composites was strongly influenced by the concentration of CTAB, FeCl2, ammonia solution and the reaction temperature. The saturation magnetization of PEDOT/γ-Fe2O3 micro-bowls increased with the increase of FeC12 concentration and reached 6.20 AmE/kg at the FeCl2 concentration of 0.30 mol/L. The conductivity of the PEDOT/γ-Fe2O3 composites was in the range of 101 S/cm. The electrical and magnetic sources of PEDOT/γ-Fe2O3 micro-bowls were confirmed by SEM-EDX, TEM, XRD and XPS spectra. And the possible formation mechanism of PEDOT//7：Fe203 was proposed.展开更多
The potential use of sound and vibration for diagnostic and therapeutic purposes remains largely under-explored and under-estimated.Sound and vibrational energy has great positive impact on the mind and body.It could ...The potential use of sound and vibration for diagnostic and therapeutic purposes remains largely under-explored and under-estimated.Sound and vibrational energy has great positive impact on the mind and body.It could be particularly useful for psychosomatic diseases as a complementary therapy.Singing bowls,the spiritual ancient therapy has been claimed to aid in mind relaxation and painful and inflammatory conditions.Childhood asthma is an inflammatory airway disease and a psychosomatic disorder.The psychological management in it is often neglected leading to under-treatment or a relapse.Hence,we hypothesized that sound therapy with singing bowls might be useful as complementary therapy in management of childhood asthma.We aimed to study the effect of singing bowl session on child’s asthma severity and control and on the psychological well-being.Children<18 years of age and suffering from childhood asthma were recruited after informed written consent of parents.At the baseline,demographic and clinical details were noted.Anthropometric parameters,PEFR readings,asthma severity,parental and child’s subjective feeling of well-being,asthma control score,and pediatric symptom checklist score(based on age)were determined.The child was given 15 min of singing bowl session as per the set protocol.The subjective and objective evaluation of asthma control and psychological assessment was repeated at 1 month and 3 months follow-up and compared with the baseline results for clinical significance.Eighteen children formed the study group with a mean age of 9.13±2.15 years(range 2–15.25 years).4 children had psychological issues on initial screening.There was a significant improvement in asthma severity,subjective feeling of well-being and asthma control score at 3 months(p<0.05).Singing bowl therapy could be a useful,low-cost complementary therapy in childhood asthmatics.展开更多
Bowl-like poly (styrene-co-glycidyl methacrylate) was synthesized by swollen seeded emulsion polymerization. The polymerization was carried out in PS seed emulsion swollen by toluene, whereby the bowl-like particles f...Bowl-like poly (styrene-co-glycidyl methacrylate) was synthesized by swollen seeded emulsion polymerization. The polymerization was carried out in PS seed emulsion swollen by toluene, whereby the bowl-like particles formed at last. The shape was observed by SEM. These particles became ball-like when swollen by toluene, observed by optical microscope, and the release behavior of solvent from them was examined.展开更多
The adsorption characteristics of rare earth ion La(Ⅲ) on Yunnan bowl tea surface from aqueous solution and effects of various surfactants on the adsorption were studied. It was found that Yunnan bowl tea can adsorb ...The adsorption characteristics of rare earth ion La(Ⅲ) on Yunnan bowl tea surface from aqueous solution and effects of various surfactants on the adsorption were studied. It was found that Yunnan bowl tea can adsorb strongly La(Ⅲ) and pH may affect drastically the adsorption amount of La(Ⅲ). The adsorption law of La(Ⅲ) on Yunnan bowl tea surface follows the Langmuir equation. The maximum adsorption amount of La(Ⅲ) can reach 15 mg·g (-1). A comprehensive adsorption model is suggested according to the experimental results.展开更多
In this paper, various strategies of spiral irradiating scheme for the flame forming of a bowl shaped surface are investigated experimentally and numerically. Experimental work is performed using a flame torch integra...In this paper, various strategies of spiral irradiating scheme for the flame forming of a bowl shaped surface are investigated experimentally and numerically. Experimental work is performed using a flame torch integrated with a 2-axis CNC workstation. The ABAQUS implicit solver is used in the numerical simulation. Three different strategies of the spiral irradiating scheme are investigated for the flame forming of a bowl shaped surface. The first strategy is the Simple spi- ral irradiating scheme, the second is the Rotational spiral irradiating scheme, and the third is the Symmetrical-Rotational spiral irradiating scheme. The results show that using the Symmetrical- Rotational spiral irradiating scheme, a bowl shaped surface with the maximum deformation can be produced, followed by using the Rotational scheme, and the Simple spiral scheme. It is also concluded from the results that the spiral irradiating scheme with Symmetrical-Rotational, Rota- tional and Simple spiral schemes lead to the maximum symmetries in the produced bowl shaped surface, respectively. All the numerical results are in good agreement with the experimental ob- servations.展开更多
Carbon is a promising capacitive electrode material for Zn-ion hybrid supercapacitors(ZHSCs),as it is low-cost,environmentally friendly,controllable and adjustable.By now,achieving both high energy and high power with...Carbon is a promising capacitive electrode material for Zn-ion hybrid supercapacitors(ZHSCs),as it is low-cost,environmentally friendly,controllable and adjustable.By now,achieving both high energy and high power with carbon electrodes is still challenging,limited by their intrinsic properties.In this work,we have designed and presented an amorphous hollow carbon bowl material with surface chemical modifications of oxygen groups to figure out these concerns.The preparation of bowl-like structures and the storage behavior between Zn^(2+)and oxygen functional groups have also been discussed.With the contributions from its unique hollow structure and surface functional groups,it can significantly enhance the electrode pseudocapacitance and the entire electrochemical performance.展开更多
At present ESG (Electrostatic Suspended Gyro) is the most precise inertia element in the world. The electrode bowl, which has direct effect on the precision of ESG, is a key part to ESG. Through the analysis of the fu...At present ESG (Electrostatic Suspended Gyro) is the most precise inertia element in the world. The electrode bowl, which has direct effect on the precision of ESG, is a key part to ESG. Through the analysis of the function and characteristic of the electrode bowl in hollow rotor ESG and the present situation of new material development in the world, the alumina ceramic is regarded as the best material for the electrode bowl of hollow rotor ESG. By analyzing the present situation of alumina ceramic in the world, main technique requirements have been put forward for the alumina ceramic of ESG electrode bowl which is also fit for solid rotor ESG.展开更多
For the first time,an allowable defect analysis of the bowl body of XZZ 1200-G Centrifuge was made by using fatigue fracture mechanics method;and,again for the first time,the design fatigue curve of the dangerous sect...For the first time,an allowable defect analysis of the bowl body of XZZ 1200-G Centrifuge was made by using fatigue fracture mechanics method;and,again for the first time,the design fatigue curve of the dangerous section of the bowl body was given out、which may form the basis for the design and use of the centrifuge.展开更多
To improve the efficiency of fetching and transplanting seedlings for the mechanization of strawberry planting,an integrated transplanting mechanism was designed with protruding,fetching and planting performance to ac...To improve the efficiency of fetching and transplanting seedlings for the mechanization of strawberry planting,an integrated transplanting mechanism was designed with protruding,fetching and planting performance to achieve rapid fetching and pushing bowl movements.According to the working principle of the slewing mechanism,a kinematics model and the optimization goal were established,respectively.Based on visual auxiliary analysis software,optimal parameters were obtained.A three-dimensional model was established to obtain a simulation trajectory by means of a virtual simulation design analysis.Three-dimensional printing technology was used to manufacture the test prototype,and the actual working trajectories of the test prototype were extracted using high-speed photography technology,which verified the consistency of the actual trajectory with the theoretical and simulated trajectories.A prototype transplanting experiment was performed with the success rate of seedling extraction of 91.2%and excellent planting rate of 82.8%,which met the requirements for integrated strawberry harvesting,planting and transplanting.The experimental results verified the correctness and feasibility of the design of integrated transplanting mechanism.展开更多
The age of the volcanic rocks of the Mount Bowles Formation (MBF) on the eastern part of Livingston Island, South Shetland Islands, Antarctica is redetermined by using 40Ar/39Ar and laser microarea isochron age dating...The age of the volcanic rocks of the Mount Bowles Formation (MBF) on the eastern part of Livingston Island, South Shetland Islands, Antarctica is redetermined by using 40Ar/39Ar and laser microarea isochron age dating method with a continuous laser system and mass spectrometer. The isochron ages of an andesite sample and a basaltic andesite sample are (105.62±2.11) Ma and (111.48±2.23) Ma with the 40Ar/36Ar initial ratios of 295.3 and 294.6 respectively, being almost the same as the atmospheric value, which proves that there exists no excess argon in these rocks. The 40Ar/39Ar plateau age of an aplite sample is (96.7±1.6) Ma and the calculated isochron age is 96.6 Ma, which indicates that the aplite occurred after lava eruption. These data suggest that the MBF volcanic rocks were formed during Cretaceous.展开更多
The art of cricket bowling is complex and arduous owing to the run-up and ball release time energy requirement to achieve speed and variations. Therefore, human bowlers cannot bowl for extended periods and numerous me...The art of cricket bowling is complex and arduous owing to the run-up and ball release time energy requirement to achieve speed and variations. Therefore, human bowlers cannot bowl for extended periods and numerous mechanical bowling machines have been built to help batsmen improve their skills during practice sessions. However, most of these existing machines are designed for spherical balls ignoring the distinguishing physical feature of a cricket ball: the raised equatorial seam, which makes it less of a sphere. The bowlers are known to often benefit from this seam in their pursuit to taking the batsmen's wicket by imparting swing, spin and bounce variations along-with other bowling variables. This lack of the seam consideration creates a void between human and mechanical bowling. In this work, we present design and development of an automatic bowling machine termed as ROBOWLER to make mechanical bowling more realistic. This machine ensures ball seam position as well as fulfills other constraints. Ball pitching and seam position accuracy results underscore the suitability of this design to enhance the capabilities of mechanical bowling.展开更多
Today millions of people enjoy the game of bowlingthroughout the world, in which they roll the bowlingball down the wooden lane and try to knock down tenwooden pins. People have played and enjoyed bowling for thou-san...Today millions of people enjoy the game of bowlingthroughout the world, in which they roll the bowlingball down the wooden lane and try to knock down tenwooden pins. People have played and enjoyed bowling for thou-sands of years. It is believed that during the Stone Agethe aboriginal communities had already started to playa kind of bowling game. They rolled large rocks or peb-展开更多
Llex cornuta var.fortunei S.Y.Hu is a good ornamental tree species for viewing fruits and leaves,and has a wide range of garden uses.Nutrition bowl cutting seedlings can improve the survival rate of L.cornut a var.for...Llex cornuta var.fortunei S.Y.Hu is a good ornamental tree species for viewing fruits and leaves,and has a wide range of garden uses.Nutrition bowl cutting seedlings can improve the survival rate of L.cornut a var.fortunei S.Y.Hu transplanting and greening,and has the advantages of no time limit for planting and saving management costs.Based on this,this paper introduced the container seedling double-covering cutting technology for L.cornut a var.fortunei,to provide a reference for the propagation of L.cornut a var.fortunei.展开更多
This paper presents some results of theoretical analysis of the effects of systemerrors on bowl track performance with the assumptioris of all controlcomponents and modules having been calibrated to their nomuial perf...This paper presents some results of theoretical analysis of the effects of systemerrors on bowl track performance with the assumptioris of all controlcomponents and modules having been calibrated to their nomuial perfomcelevels such that only random errors exist of which we have little control.Theporformance levels needed to be raised considerably by anpraving in our presenttechnique of predicting bowl track resistance.展开更多
Louis Chu's novel Eat a Bowl of Tea(1961) is widely recognized as a pioneer masterpiece in Chinese American litera-ture. It pictures the bachelor society of Chinatown in New York City after the Second World War. S...Louis Chu's novel Eat a Bowl of Tea(1961) is widely recognized as a pioneer masterpiece in Chinese American litera-ture. It pictures the bachelor society of Chinatown in New York City after the Second World War. Several characteristics of China-town's community organizations are reflected in this novel: kinship-based; responsible for protecting and caring for the members;led by commercial elites; rule of man, rather than rule of law. It offers us a precious chance to take a glimpse of the Chinese-Ameri-can society in post-World War II era.展开更多
文摘Last Sunday,I felt very hungry when I got up late.There was no food in the fridge,so l decided to cook noodles for me①.First,I filled the pot with water and put it on the stove.I waited patiently for the water to boil.Then,I put the noodles into the boiling water.Next,I added some vegetables,an egg,and a little salt.
文摘Inside the production workshop of a food processing enterprise under Jiangsu Province’s Sheyang Rice Group,rice harvested from Sheyang County’s green cultivation bases moves smoothly along the assembly line.Following raw material processing,enzymatic hydrolysis,and blending,the rice is converted into a liquid product and packaged in easy-open cans.
基金Supported by Key Scientific and Technological Project of Henan Province(072102150001)~~
文摘[Objective] The experiment aimed to study the growth characteristics of hydroponic bowl lotus. [Method] The lotus variety Hongxia was chosen as the experimental material. Two treatments, hydroponics and soil culture were set to measure their photosynthetic indices, chlorophyll content and root vigor, and to observe their leaf tissue structure and stomatal characteristics. [Result] The findings indicated that there are no differences in the leaf physiological indices between bowl lotus under hydroponics and soil culture, while the leaf stomata of hydroponic bowl lotus is bigger and its amount is larger than that of soil-culture bowl lotus. At the same time, the ratio of the palisade tissue thickness to spongy tissue thickness is small,and its leaf tissue structure is loose. The root vigor of hydroponic bowl lotus reached its summit earlier, then began to drop. Whereas, the root activity of soil-culture lotus sustained increasing, with vigorous growth. [Conclusion] Therefore, it indicated that hydroponic bowl lotus can adapt to the aquatic-culture environment well and quickly, meanwhile, it also enters into its aging period quickly and its growth cycle gets shorter.
基金the National Natural Science Foundation of China(Nos.21522203,21372111,and 21190034)State Key Laboratory of Applied Organic Chemistry for the financial support
文摘The conjugated polycycles show excellent optical and electrical properties that are suitable for application in various organic electronics.While most of attentions have been paid to polycycles having planar π-conjugated system,the curved polycycles seem amazing due to their unique physical and chemical features.The non-planar conjugated polycycles have been created with the geometries of bracelet,saddle,bowl,Mobius band,helicenes,etc.Among them,the bowl-shaped one is of growing interest owing to the multidiscipline applications such as synthetic intermediates for end-cap of carbon nanotube,coordination with metal ions,encapsulation of fullerenes,and fabrication of electronic devices.In this paper,we summarize the recent advances on the chemistry of the bowl-shaped conjugated polycycles,particularly on their synthesis and the further chemical modifications toward organic functional materials.
基金financially supported by the National Natural Science Foundation of China (No.50973098)National Science and Technology Support Program (No.2012BAB15B02)the New Zealand Foundation for Science and Technology (contract No.UOAX0806)
文摘In this paper, electromagnetic poly（3,4-ethylenedioxythiophene）/γ-Fe2O3 （PEDOT/γ-Fe2O3 ） micro-bowls, 1-2 gm in diameter, were prepared by a simple environment-friendly process. In this method, the aqueous solution of cetyltrimethylammonium bromide （CTAB） instead of any organic solvent was used. FeC13 acted as a source of FeIII for the formation of γ-Fe2O3 and as an oxidant for the polymerization of 3,4-ethylenedioxythiophene （EDOT）. The bowl-shaped morphology of PEDOT/γ-Fe2O3 composites was strongly influenced by the concentration of CTAB, FeCl2, ammonia solution and the reaction temperature. The saturation magnetization of PEDOT/γ-Fe2O3 micro-bowls increased with the increase of FeC12 concentration and reached 6.20 AmE/kg at the FeCl2 concentration of 0.30 mol/L. The conductivity of the PEDOT/γ-Fe2O3 composites was in the range of 101 S/cm. The electrical and magnetic sources of PEDOT/γ-Fe2O3 micro-bowls were confirmed by SEM-EDX, TEM, XRD and XPS spectra. And the possible formation mechanism of PEDOT//7：Fe203 was proposed.
文摘The potential use of sound and vibration for diagnostic and therapeutic purposes remains largely under-explored and under-estimated.Sound and vibrational energy has great positive impact on the mind and body.It could be particularly useful for psychosomatic diseases as a complementary therapy.Singing bowls,the spiritual ancient therapy has been claimed to aid in mind relaxation and painful and inflammatory conditions.Childhood asthma is an inflammatory airway disease and a psychosomatic disorder.The psychological management in it is often neglected leading to under-treatment or a relapse.Hence,we hypothesized that sound therapy with singing bowls might be useful as complementary therapy in management of childhood asthma.We aimed to study the effect of singing bowl session on child’s asthma severity and control and on the psychological well-being.Children<18 years of age and suffering from childhood asthma were recruited after informed written consent of parents.At the baseline,demographic and clinical details were noted.Anthropometric parameters,PEFR readings,asthma severity,parental and child’s subjective feeling of well-being,asthma control score,and pediatric symptom checklist score(based on age)were determined.The child was given 15 min of singing bowl session as per the set protocol.The subjective and objective evaluation of asthma control and psychological assessment was repeated at 1 month and 3 months follow-up and compared with the baseline results for clinical significance.Eighteen children formed the study group with a mean age of 9.13±2.15 years(range 2–15.25 years).4 children had psychological issues on initial screening.There was a significant improvement in asthma severity,subjective feeling of well-being and asthma control score at 3 months(p<0.05).Singing bowl therapy could be a useful,low-cost complementary therapy in childhood asthmatics.
文摘Bowl-like poly (styrene-co-glycidyl methacrylate) was synthesized by swollen seeded emulsion polymerization. The polymerization was carried out in PS seed emulsion swollen by toluene, whereby the bowl-like particles formed at last. The shape was observed by SEM. These particles became ball-like when swollen by toluene, observed by optical microscope, and the release behavior of solvent from them was examined.
文摘The adsorption characteristics of rare earth ion La(Ⅲ) on Yunnan bowl tea surface from aqueous solution and effects of various surfactants on the adsorption were studied. It was found that Yunnan bowl tea can adsorb strongly La(Ⅲ) and pH may affect drastically the adsorption amount of La(Ⅲ). The adsorption law of La(Ⅲ) on Yunnan bowl tea surface follows the Langmuir equation. The maximum adsorption amount of La(Ⅲ) can reach 15 mg·g (-1). A comprehensive adsorption model is suggested according to the experimental results.
文摘In this paper, various strategies of spiral irradiating scheme for the flame forming of a bowl shaped surface are investigated experimentally and numerically. Experimental work is performed using a flame torch integrated with a 2-axis CNC workstation. The ABAQUS implicit solver is used in the numerical simulation. Three different strategies of the spiral irradiating scheme are investigated for the flame forming of a bowl shaped surface. The first strategy is the Simple spi- ral irradiating scheme, the second is the Rotational spiral irradiating scheme, and the third is the Symmetrical-Rotational spiral irradiating scheme. The results show that using the Symmetrical- Rotational spiral irradiating scheme, a bowl shaped surface with the maximum deformation can be produced, followed by using the Rotational scheme, and the Simple spiral scheme. It is also concluded from the results that the spiral irradiating scheme with Symmetrical-Rotational, Rota- tional and Simple spiral schemes lead to the maximum symmetries in the produced bowl shaped surface, respectively. All the numerical results are in good agreement with the experimental ob- servations.
基金financially supported by the National Natural Science Foundation of China(Nos.22075109,22279056)the Jiangsu Provincial Department of Science and Technology(No.BK20220010).
文摘Carbon is a promising capacitive electrode material for Zn-ion hybrid supercapacitors(ZHSCs),as it is low-cost,environmentally friendly,controllable and adjustable.By now,achieving both high energy and high power with carbon electrodes is still challenging,limited by their intrinsic properties.In this work,we have designed and presented an amorphous hollow carbon bowl material with surface chemical modifications of oxygen groups to figure out these concerns.The preparation of bowl-like structures and the storage behavior between Zn^(2+)and oxygen functional groups have also been discussed.With the contributions from its unique hollow structure and surface functional groups,it can significantly enhance the electrode pseudocapacitance and the entire electrochemical performance.
文摘At present ESG (Electrostatic Suspended Gyro) is the most precise inertia element in the world. The electrode bowl, which has direct effect on the precision of ESG, is a key part to ESG. Through the analysis of the function and characteristic of the electrode bowl in hollow rotor ESG and the present situation of new material development in the world, the alumina ceramic is regarded as the best material for the electrode bowl of hollow rotor ESG. By analyzing the present situation of alumina ceramic in the world, main technique requirements have been put forward for the alumina ceramic of ESG electrode bowl which is also fit for solid rotor ESG.
文摘For the first time,an allowable defect analysis of the bowl body of XZZ 1200-G Centrifuge was made by using fatigue fracture mechanics method;and,again for the first time,the design fatigue curve of the dangerous section of the bowl body was given out、which may form the basis for the design and use of the centrifuge.
基金Supported by the National Natural Science Foundation of China Youth Fund Project(52005221)"the 13th Five-Year"National Key Research and Development Program:High-speed Planting Technology and Equipment Research and Development(2017YFD0700800)。
文摘To improve the efficiency of fetching and transplanting seedlings for the mechanization of strawberry planting,an integrated transplanting mechanism was designed with protruding,fetching and planting performance to achieve rapid fetching and pushing bowl movements.According to the working principle of the slewing mechanism,a kinematics model and the optimization goal were established,respectively.Based on visual auxiliary analysis software,optimal parameters were obtained.A three-dimensional model was established to obtain a simulation trajectory by means of a virtual simulation design analysis.Three-dimensional printing technology was used to manufacture the test prototype,and the actual working trajectories of the test prototype were extracted using high-speed photography technology,which verified the consistency of the actual trajectory with the theoretical and simulated trajectories.A prototype transplanting experiment was performed with the success rate of seedling extraction of 91.2%and excellent planting rate of 82.8%,which met the requirements for integrated strawberry harvesting,planting and transplanting.The experimental results verified the correctness and feasibility of the design of integrated transplanting mechanism.
文摘The age of the volcanic rocks of the Mount Bowles Formation (MBF) on the eastern part of Livingston Island, South Shetland Islands, Antarctica is redetermined by using 40Ar/39Ar and laser microarea isochron age dating method with a continuous laser system and mass spectrometer. The isochron ages of an andesite sample and a basaltic andesite sample are (105.62±2.11) Ma and (111.48±2.23) Ma with the 40Ar/36Ar initial ratios of 295.3 and 294.6 respectively, being almost the same as the atmospheric value, which proves that there exists no excess argon in these rocks. The 40Ar/39Ar plateau age of an aplite sample is (96.7±1.6) Ma and the calculated isochron age is 96.6 Ma, which indicates that the aplite occurred after lava eruption. These data suggest that the MBF volcanic rocks were formed during Cretaceous.
文摘The art of cricket bowling is complex and arduous owing to the run-up and ball release time energy requirement to achieve speed and variations. Therefore, human bowlers cannot bowl for extended periods and numerous mechanical bowling machines have been built to help batsmen improve their skills during practice sessions. However, most of these existing machines are designed for spherical balls ignoring the distinguishing physical feature of a cricket ball: the raised equatorial seam, which makes it less of a sphere. The bowlers are known to often benefit from this seam in their pursuit to taking the batsmen's wicket by imparting swing, spin and bounce variations along-with other bowling variables. This lack of the seam consideration creates a void between human and mechanical bowling. In this work, we present design and development of an automatic bowling machine termed as ROBOWLER to make mechanical bowling more realistic. This machine ensures ball seam position as well as fulfills other constraints. Ball pitching and seam position accuracy results underscore the suitability of this design to enhance the capabilities of mechanical bowling.
文摘Today millions of people enjoy the game of bowlingthroughout the world, in which they roll the bowlingball down the wooden lane and try to knock down tenwooden pins. People have played and enjoyed bowling for thou-sands of years. It is believed that during the Stone Agethe aboriginal communities had already started to playa kind of bowling game. They rolled large rocks or peb-
文摘Llex cornuta var.fortunei S.Y.Hu is a good ornamental tree species for viewing fruits and leaves,and has a wide range of garden uses.Nutrition bowl cutting seedlings can improve the survival rate of L.cornut a var.fortunei S.Y.Hu transplanting and greening,and has the advantages of no time limit for planting and saving management costs.Based on this,this paper introduced the container seedling double-covering cutting technology for L.cornut a var.fortunei,to provide a reference for the propagation of L.cornut a var.fortunei.
文摘This paper presents some results of theoretical analysis of the effects of systemerrors on bowl track performance with the assumptioris of all controlcomponents and modules having been calibrated to their nomuial perfomcelevels such that only random errors exist of which we have little control.Theporformance levels needed to be raised considerably by anpraving in our presenttechnique of predicting bowl track resistance.
文摘Louis Chu's novel Eat a Bowl of Tea(1961) is widely recognized as a pioneer masterpiece in Chinese American litera-ture. It pictures the bachelor society of Chinatown in New York City after the Second World War. Several characteristics of China-town's community organizations are reflected in this novel: kinship-based; responsible for protecting and caring for the members;led by commercial elites; rule of man, rather than rule of law. It offers us a precious chance to take a glimpse of the Chinese-Ameri-can society in post-World War II era.
