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1.
Jeju Island is a volcanic island,dominated by Halla(汉拿)Mountain:a volcano 1,950 meters high and the highest mountain in South Korea.The island measures approximately 73 kilometers across east to west,and 41 kilometers from north to south.The island was created entirely from volcanic eruptions approximately 2 million years ago,during the time period extending from the Tertiary to the beginning of the Quaternary period,and consists chiefly of basalt and lava.The eruptions took place in the Cenozoic era. 相似文献
2.
One day, when I was a freshman in high school, I saw a kid from my class was walking home from school. His name was Kyle. It looked like he was carrying all of his books. As I was walking, 1 saw some kids running toward him. They ran at him, knocking all his books out of his arms and tripping him so he landed in the dirt. His glasses went flying, and I saw them land in the grass about ten feet from him. 相似文献
3.
Isn't it amazing how one person, sharing one idea, at the right time and place can change the course of your life's history? This is certainly what 1 in my life. When I was 14, I was hitchhiking from Houston, Texas, through El Paso on my way to California. I was following my 2 , journeying with the sun. I was a high school dropout with learning 3 and was set on surfing the biggest waves in the world, first in California and then in 相似文献
4.
The high temperature heat pump and desiccant wheel(HTHPDW) system can make full use of heat released from the condenser of heat pump for DW regeneration without additional heat. In this study, DW operation in the HTHPDW system was investigated experimentally, and the optimization analysis of HTHPDW system was carried out. The performance of DW had influence on the dehumidification(evaluated by dehumidification and regeneration effectiveness) and cooling load(evaluated by thermal and adiabatic effectiveness). The results show that the enthalpy increase occurred in all the experiments. Compared to the isosteric heat, heat accumulation in the desiccant and matrix material and heat leakage from regeneration side to process side have greater influence on the adiabatic effectiveness. Higher regeneration temperature leads to lower adiabatic effectiveness that increases more cooling load of the system. When the regeneration temperature is 63℃, the maximal dehumidification effectiveness is 35.4% and the satisfied adiabatic effectiveness is 88%, which contributes to the optimal balance between dehumidification and cooling. 相似文献
5.
Isn't it amazing how one person, sharing one idea, at the right time and place can change the course of your life's history? This is certainly what happened in ray life. When I was 14, I was hitchhiking from Houston, Texas, through El Paso on my way to California. I was following my dream, journeying with the sun. I was a high school dropout with learning disabilities and was set on surfing the biggest waves in the world, first in California and then in Hawaii, where I would later live. 相似文献
6.
The tropomyosin fraction of shrimp proteins is potentially responsible for allergic reaction in individuals with genetic predisposition to allergy. However, there are no efficient and safe methods to reduce its allergenicity. High intensity ultrasound is known to change the structure of proteins. This study is aimed at assessing high intensity ultmsound＇s effect on the allergenicity of shrimp allergen. Shrimp and purified shrimp allergen were treated with high intensity ultrasound for 30-180 min. Extracts of treated samples were analyzed by enzyme-linked immunosorbent assay （ELISA） with pool serum of shrimp allergy patients and polyclonal anti-allergen antibodies and by immunoblotting after polyacrylamide gel electrophoresis. Shrimp treated with high intensity ultrasound showed a decrease in allergenicity measured with ELISA. A linear relationship between the immune response induced by treated shrimp allergen and the applied treatment time was observed. The decrease in allergenicity was confirmed by immunoblot assays with shrimp allergic patients serum. Allergenicity of shrimp allergen extracted from treated shrimp was higher than that of purified shrimp allergen with the same treatment time. Gel-filtration HPLC was applied for analysis of shrimp allergen after treatment with high intensity ultrasound. Some fractions were appeared with increasing treatment time. The results suggested that high intensity ultrasound could be used to reduce the allergenicity of shrimp. 相似文献
7.
Yesterday afternoon John and I were walking along a road where we heard someone shout “Help!Help!”He was in a lake,about a hundred feet from the shore.There was a small boat nearby.We knew immediately what happened. He had fallen out of the boat and could not swim good enough to reach it or to get to the shore.As we ran toward the lake I 相似文献
8.
It is a very fine substitutable energy technology to synthesize ethanol from biomass-derived syngas. This paper summarized the development of preparing ethanol from syngas, and especially elaborated on the research status of catalysts for the process. Based on the relative researches on the reaction mechanism, structure and performance of the catalysts, the optimum design of catalysts with high activity was presented in this review, which set the theoretical and application foundation for the industrial production of ethanol from syngas. 相似文献
9.
Targeted yield concept and a framework of fertilizer recommendation in irrigated rice domains of subtropical India 总被引：1，自引：0，他引：1
Bera R Seal A Bhattacharyya P Das TH Sarkar D Kangjoo K 《Journal of Zhejiang University. Science. B》2006,7(12):963-968
Soil test crop response （STCR） correlation studies were carried out in Vindhyan alluvial plain during 2001 to 2004 taking IR-36 as test crop to quantify rice production in the context of the variability of soil properties and use of balanced fertilizers based on targeted yield concept. The soils were developed on gently sloping alluvial plain with different physiographic settings and notable variation in drainage condition. Soil properties show moderate variation in texture （loamy to clay）, organic carbon content （4.4 to 9.8 g/kg）, cation exchange capacity （10,2 to 22.4 cmol （p＋）/kg） and pH （5.3 to 6,4）, Soil fertility status for N is low to medium （224 to 348 kg/ha）, P is medium to high （87 to 320 kg/ha） and K ranges from medium to high （158 to 678 kg/ha）. Database regarding nutrient requirement in kg/t of grain produce （NR）, the percent contribution from the soil available nutrients [CS （%）] and the percent contribution from the applied fertilizer nutrients [CF （%）] were computed for calibrating and fbrmulating fertilizer recommendations. Validity of the yield target for 7 and 8 t/ha was tested in farmers＇ fields and yields targets varied at less than 10%. The percent achievement of targets aimed at different level was more than 90%, indicating soil test based fertilizer recommendation approach was economically viable within the agro-ecological zone with relatively uniform cropping practices and socio-economic conditions. 相似文献
10.
A( 阅读时间: 4 分钟)Surtsey was born in 1963. Scientists sawthe birth of this island. It began at 7:30 a.m. on14th November. A fishing boat was nearIceland. The boat moved under the captain’s( 船长) feet. He noticed a strange smell. Hesaw some black smoke. A volcano( 火山) wasbreaking out. Red-hot rocks, fire and smokewere rushing up from the bottom( 底部) of thesea. The island grew quickly. It was 10 metershigh the next day and 60 meters high on 18thNovember. Scientists flew there to watch.Smoke and fire were still ru... 相似文献
11.
Zahari TAHA Hani-kumiati LELANA Hideki AOYAMA Raja Ariffin RAJA GHAZILLA Julirose GONZALES Novita SAKUNDARINI Sugoro B. SUTONO 《浙江大学学报(A卷英文版)》2010,(12):966-971
Surface roughness is an important parameter for ensuring that the dimension of geometry is within the permitted tolerance.The ideal surface roughness is determined by the feed rate and the geometry of the tool.However,several uncontrollable factors including work material factors,tool angle,and machine tool vibration,may also influence surface roughness.The objective of this study was to compare the measured surface roughness (from experiment) to the theoretical surface roughness (from theoretical calculation) and to investigate the surface roughness resulting from two types of insert,‘C’ type and ‘T’ type.The experiment was focused on the turning process,using a lathe machine Colchester 6000.The feed rate was varied within the recommended feed rate range.We found that there were large deviations between the measured and theoretical surface roughness at a low feed rate (0.05 mm/r) from the application of both inserts.A work material factor of AISI D2 steel that affects the chip character is presumably responsible for this phenomenon.Interestingly,at a high feed rate (0.4 mm/r),the ‘C’ type insert resulted in 40% lower roughness compared to the ‘T’ type due to the difference in insert geometry.This study shows that the geometry of an insert may result in a different surface quality at a particular level of feed rate. 相似文献
12.
Guo-dong HAO Yi-wu ZHENG Birgitte GJESING Xing-ai KONG Jing-yuan WANG Zhi-jing SONG Xu-xin LAI Nan-shan ZHONG Michael D.SPANGFORT 《Journal of Zhejiang University. Science. B》2013,14(3):240-246
Objective:Weed pollens are common sources of allergens worldwide.The prevalence of weed pollen sensitization is not yet fully known in China.The purpose of this study was to investigate the prevalence of sensitization to weed allergens from Artemisia,Ambrosia,and Humulus in northern China.Methods:A total of 1144 subjects(aged from 5 to 68 years) visiting our clinic from June to October 2011 underwent intradermal testing using a panel of 25 allergen sources.Subjects with positive skin responses to any pollen were further tested for their serum concentrations of IgE antibodies against Artemisia vulgaris,Ambrosia artemisiifolia,and Humulus scandens,and against the purified allergens,Art v 1 and Amb a 1.Results:Of 1144 subjects,170 had positive intradermal reactions to pollen and 144 donated serum for IgE testing.The prevalence of positive intradermal responses to pollens of Artemisia sieversiana,Artemisia annua,A.artemisiifolia,and H.scandens was 11.0%,10.2%,3.7%,and 6.6%,respectively.Among the intradermal positive subjects,the prevalence of specific IgE antigens to A.vulgaris was 58.3%,to A.artemisiifolia 14.7%,and to H.scandens 41.0%.The prevalence of specific IgE antigens to the allergen Art v 1 was 46.9%,and to Amb a 1 was 11.2%.The correlation between the presence of IgE antibodies specific to A.vulgaris and to the Art v 1 antigen was very high.Subjects with A.artemisiifolia specific IgE also had A.vulgaris specific IgE,but with relatively high levels of A.vulgaris IgE antibodies.There were no correlations between the presence of IgE antibodies to H.scandens and A.vulgaris or to H.scandens and A.artemisiifolia.Conclusions:The intradermal prevalence of weed pollen sensitization among allergic subjects in northern China is about 13.5%.Correlations of specific IgE antibodies suggest that pollen allergens from Artemisia and Humulus are independent sources for primary sensitization. 相似文献
13.
We describe the green space system planning and design of a new Kaixian City for migrants in the Three Gorges Reservoir area of P. R. China. The goal of the project was to provide a high quality settlement for migrants relocated from the old Kaixian City that had a history of over one thousand years and from other places with different traditional cultures. Our efforts focused on conceiving affordable strategies to increase green areas, improve waterfront landscapes, deal with water level fluctuation, integrate diverse folk cultures, and encourage bicycling as an environmentally-friendly form of urban transportation. The new city is anticipated to benefit from the green space systems with an improved eco-environment, enriched tourism resources, cheap landscaping costs, relief from traffic pressure, and in other ways. The planning philosophies employed could be useful in the engineering and construction of other cities in the Three Gorges Reservoir area. 相似文献
14.
Illumination system with compound parabolic retro-reflector for single LCOS panel projection display
ZHEN Yan-kun YE Zi ZHANG Wen-zi ZHAO Ting-yu YU Fei-hong 《浙江大学学报(A卷英文版)》2007,8(12):2021-2026
In this paper, a new illumination system with ultra high performance (UHP) lamp is proposed for projection display. Parabolic reflector (PR) and compound parabolic retro-reflector (CPR) were jointly used to collect and collimate the light generated from UHP lamp. A polarization converter system (PCS) was used to increase the light efficiency of the projection display system. A beam transformer between PCS and 2f imaging systems was directly used to make the illumination meet the requirement of projection display system. With the consideration of the loss of reflection, the light efficiency in this projection display system was estimated to be 15.6%. 相似文献
15.
Eugene O’Neill,one of the essential writers of the 20th century,was hailed as the“American Shakespeare.”He enjoyed a high reputation in America owing to his special writing techniques.Long Day’s Journey into Night was his last play,which was an autobiographical play to some extent,and founded on his own authentic experience.The play told the story of an Irish immigrant family’s daily life from day to night.Among the studies at home and abroad,many discuss this play from a psychological perspective and Feminist perspective.The article,instead,gives an interpretation of this play according to Cooperative Principle.Through the analysis of their conversations,it points out what principles their communications violated so as to understand the implied meaning of their conversations.The thesis tries to study the conversations between Mary and other family members,and then demonstrate that Mary is the most tragic person in the family. 相似文献
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17.
After entering 21 st century,our country has started an incomparable huge English teaching revolution. English has been taught in more and more universities,colleges,high schools,and even primary schools since the early 1990 s. After the decision,which made by China` s Ministry of Education,of offering English courses from Grade 3 in primary schools nationwide in China from county-level in the fall of 2001 was carried out step by step,the starting age of foreign language learning for children have been discussed in China. Many experts and scholars in foreign language teaching and research fields paid close attention to it and held different opinions about offering English courses in primary schools. This study aims to do some research in theory to query the feasibility of offering English courses to the primary school students in China. The mainly underlying theoretical framework in this thesis is the critical period hypothesis discussed by Rod Ellis in Understanding Second Language Acquisition. By referring to his argument about age,the thesis seeks other two theories to support the idea that it is inappropriate to offer English courses in primary schools. 相似文献
18.
Selection of an appropriate reporting verb and its tense & voice in a particular context is one of the best ways for the writer to present his work appropriately and to communicate effectively with others in the academic community.Previous studies on reporting verbs varied from sample to discipline,however,to my knowledge,no study has specifically addressed the question of whether there is tense and voice variation of reporting verbs in research articles in Introduction and Discussion in agricultural context.The present study is an attempt to investigate the tense and voice variation of reporting verbs and looks for explanations based on 30 agricultural science research articles.Results showed that no predominant tense choice was found in Introduction while simple past tense and present perfect tense were two tense preferences in Discussion.Active voice was found to be predominant in Introduction whereas passive voice was found to be predominant in Discussion. 相似文献
19.
Imagine yourself as an astronaut flying high above the Earth.The most important thing in your spaceship is not your camera or your radio.The most important thing you have is your garden,where you grow food to eat and air to breathe.Growing air?Well,that isn't exactly what happens.But plants do take carbon dioxide from the air and use the light and water that help them grow to make oxygen.Take a deep breath. That came from a plant!It took 1.5 billion years of plants making oxygen before there was enough oxy- gen for us to breathe. 相似文献
20.
A cluster analyzing algorithm based on grids is introduced in this paper,which is applied to data mining in the city emergency system. In the previous applications, data mining was based on the method of analyzing points and lines, which was not efficient enough in dealing with the geographic information in units of police areas. The proposed algorithm maps an event set stored as a point set to a grid unit set, utilizes the cluster algorithm based on grids to find out all the clusters, and shows the results in the method of visualization. The algorithm performs well when dealing with high dimensional data sets and immense data. It is suitable for the data mining based on geographic information system and is supportive to decision-makings in the city emergency system. 相似文献