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Representation of global precipitation anomalies using four major climate patterns

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Science China(Technological Sciences) 2015年第5期58卷 927-934页

作者： CHEN Ji chung ChiHang Department of Civil Engineering The University of Hong Kong

This study aims at finding the dominant climate patterns that influence the precipitation anomalies for different regions over the world. To this end, a multiple linear regression model is employed to represent the impact of four major climate patterns(El Ni?o-Southern Oscillation(ENSO), Indian Ocean Dipole(IOD), Arctic Oscillation(AO) and Antarctic Oscillation(AAO)) on the global precipitation anomalies. The normalized climate pattern indexes and normalized precipitation anomalies are used in the regression model. For the Northern Hemisphere, the three predictors used are the normalized NINO3.4 index(representing ENSO), normalized DMI(representing IOD) and normalized AO index; for the Southern Hemisphere, also three indexes are used as three predictors, and the normalized AO index is replaced by the normalized AAO index. The influences brought by each climate pattern can be represented by the magnitude of the corresponding regression coefficients, and the dominant climate patterns are those with the largest magnitude. The study results show that the precipitation anomalies in the northern part of South America and the northwestern part of Southeast Asia are mainly influenced by ENSO. The precipitation anomalies in East Africa and the southwestern part of Southeast Asia are mainly influenced by IOD. The precipitation anomalies in Europe and west coast of North America are mainly influenced by AO; the precipitation anomalies in the eastern part and southern part of South America, southern part of Africa, and the northeastern Australia are mainly influenced by AAO. These findings are consistent with the general understanding on the teleconnection features of the four climate patterns. Further, the regression model can be used for predicting precipitation anomalies through use of these major climate patterns.

关键词： normalized ENSO Southeast representing Australia southwestern Arctic trained instead brought

Influence on Microstructure of Micronized Sand as Cement Replacement in Cementitious Materials

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武汉理工大学学报 2010年第17期32卷 152-157页

作者： WANg y yE g Faculty of Civil Engineering and geosciences Delft University of Technology2006 GA Delft 2600the Netherlands Magnel Lab for Concrete Research Ghent UniversityGhent 9050Belgium

In this study,micronized sand is selected as a kind of filler to partially replace cement in cementitious materials. This filler is considered as chemically inert material,which can not react with water or hydration products,but still indirectly influences the hydration in a positive way. In the experimental program,non-evaporable water test was carried out to determine the degree of hydration of cement paste with and without micronized sands. The influence of different finenesses of sand particles,240 m2/kg,400 m2/kg and 1 300 m2/kg,and different curing ages were investigated. The SEM image analysis was used to characterize the morphological changes of microstructure by the presence of the micronized sand during the cement hydration process. Hydration reaction is enhanced by the use of inert micronized sands. The fineness of micronized sands influences the degree of hydration a lot. The fineness factor has been taken into account in the simulation. There is a clear interface area between sand particle and hydration products.

关键词： micronized sand microstructure fineness cementitious materials

Study of Commercial Wheat Flour Milling Process:Relation of Flour yield,Ash and Protein Contents of Flour Mill and Characteristics of Wheat Blend

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食品科学 2006年第11期27卷 146-152页

作者： y S Kim C W Deyoe O K chung E Haque Department of grain Science and Industry Kansas State University (KSU) Manhattan 66506 Kansas StateU.S. Key Laboratory ofFood Science and Safety Ministry of Education School of Food Science and Technology Southern YangtzeUniversity Wuxi 214036 China Department of grain Science and Industry Kansas State University (KSU) Manhattan 66506 Kansas StateU.S. Hard Winter Wheat Quality Laboratory Grain Marketing and Production Research Center AgriculturalResearch Service U.S. Department of Agriculture Manhattan 66502 Kansas State U.S.

The profit margin in the flour milling industry is quite narrow,so high-quality raw materials and efficiency of milling operations are crucial for every company. Many flour mills,especially those which import wheat from other countries and have limited storage space for the different varieties or classes of wheat,can not afford to buy low quality wheat. Consequently,a mathematical model which can test the impact and interactions of raw materials,in technical point of view,would be a useful decision-making tool for the milling industry. A flour miller tests wheat for physical and chemical characteristics,cleanness and soundness. The miller also performs experimental milling,if available,to have some idea how the given wheat will behave during commercial milling. Based on these test results,the miller can only guess the commercial milling results such as flour yields and flour ash and protein contents. Thus,the objective of this study was to develop empirical equations to estimate commercial milling results,using the physical,chemical and experimental milling data of the given wheat blend and also,additionally,flour ash and protein specifications of the end-user. This was done by using the actual commercial milling procedures and their wheat physical,chemical,experimental milling data,and other vital data. Data were collected from a commercial mill located in East Asia that had four production lines and used wheat blend combinations from five different wheat classes,i.e. Hard Red Winter (HRW),Dark Northern Spring (DNS),Soft White (SW),Australian Soft (AS),and Australian Standard White (ASW) wheat to produce over 40 different products. The wheat physical and chemical characteristics included test weight,thousand kernel weight,ash and protein contents. The experimental milling data were straight-grade and patent flour yields,along with patent flour ash and protein contents from a Buhler experimental mill. The commercial milling results included the flour yields of paten

关键词： Study of Commercial Wheat Flour Milling Process SFA BPP

Transmission of 2.5 gb/s WDM Channels Spaced at 5 gHz over 480 km of Single-Mode Fiber

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光学学报 2003年第S1期23卷 537-538页

作者： S. B. Jun y. C. chung Korea Advanced Institute of Science and TechnologyDepartment of Electrical Engineering 373-1 guseong-dong Yuseong-gu Daejeon 305-701 KoreaKorea Advanced Institute of Science and TechnologyDepartment of Electrical Engineering 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 Korea

We demonstrate the transmission of 2.5-gb/s WDM signals spaced at 5 gHz over 480 km of single-mode fiber. The results indicate that it should be possible to transmit more than one thousand 2.5-gb/s channels spaced at ... 详细信息

关键词： WDM on in Transmission of 2.5 gb/s WDM Channels Spaced at 5 gHz over 480 km of Single-Mode Fiber gHz of over

LOW CyCLE FATIgUE BEHAVIOR OF AZ91HP ALLOy IN AS HIgHP RESSURE DIE CASTINg

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Acta Metallurgica Sinica(English Letters) 2000年第4期13卷 961-966页

作者： Liu, Z. Xu, y.y. Wang, Z.g. Wang, y. Liu, Z.y. Inst of Metal Research Chinese Acad of Sciences Shenyang China

Fully reversed total strain-controlled low-cycle fatigue tests were conducted at room temperature in air to study the fatigue behavior of AZ91HP magnesium alloy in as high pressure die casting and subsequently heat treatment. All the specimens in different heat histories exhibit cyclic strain hardening in different degrees. It is difficult to distinguish the fatigue behavior of the die casting specimens from that of the solution aging specimens. The solution treated specimens show longer fatigue life at high strain amplitude and shorter fatigue life at low strain amplitude than the die casting and solution aging specimens though they have the lowest yield strength with higher strain hardening. Fatigue fracture surfaces for strain amplitude larger than 0.005 show very similar to those found by monotonic tensile tests. The SEM examination reveals that the regions of fatigue crack growth and final fracture can be characterized by quasi-cleavage mechanisms, but some shallow dimples, slip bands and secondary cracks are found on the fracture surface in the fracture crack growth areas.

关键词： Cracks Die casting Fatigue of materials Heat treatment

Photosensitivity and Hydroxyl in Hydrogenated Silica Fibers

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Chinese Physics Letters 1998年第9期15卷 657-658页

作者： TAN gu LIN Xiang-zhi LIU Hong-du FU Li-bin E.y.B.Pun P.S.chung Department of Physics Peking UniversityBeijing 100871 Department of Electronical Engineering City University of Hong Kong

Optical loss spectra and refractive index changes have been measured in the hydrogenated standard telecommu-nication fiber and photosensitive *** index changes due to ultraviolet exposure were found to be closely related with the OH formation in both types of fibers.A direct photolyticd model is proposed to explain the effect of hydrogen loading on the enhancement of the photosensitivity in silica fibers.

关键词： loading ultraviolet effect

RESEARCH ON AS-CAST gRAIN REFININg TECHNOLOgy By INOCULATINg CLEAN STEEL WITH TITANIUM OXIDE

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Acta Metallurgica Sinica(English Letters) 2003年第5期16卷 379-384页

作者： g.g.Cheng M.L.Wang X.E.yang y.L.Li y.g.Wang L.y.Wang P.Zhao UniversityofScienceandTechnologyBeijing Beijing100083China CentralIronandSteelResearchInstitute Beiiing100081China

Precipitation condition and nucleation of Ti2O3 during solidification of clean steel have been studied. The behavior of Ti2O3 during solidification as well as possibility of using Ti2O3 to refine as-cast grains as heterogeneous nucleation sites is discussed. It is shown that Ti2O3 can be formed provided that the steelmaking and solidification process is controlled strictly. And inoculating clean steel with Ti2O3 is an effective way to refine as-cast grains.

关键词： clean steel solidification Ti2O3 precipitation

Effect of Qingxue Dan on obesity and metabolic biomarker: a double-blind randomized-controlled pilot study

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Journal of Traditional Chinese Medicine 2016年第3期36卷 291-298页

作者： Wonseok chung Jimi Ryu Seokhee chung Sungsoo Kim Department of Korean Rehabilitation Medicine College of Korean Medicine Kyung-hee University

OBJECTIVE: To investigate the clinical effect of Qingxue Dan(QXD) on obesity and metabolic biomarker related to ***: A randomized, double blinded, placebo-controlled trial with a paralleled study design was conducted. Twenty-six obese volunteers aged between 30 and 60 with obesity and more than 2 metabolic risk factors were recruited at the department of oriental rehabilitation medicine, Kyunghee university oriental medical hospital, Seoul, Korea. Subjects were randomly assigned to an intervention(QXD) group or a placebo group, and treated with 900 mg/d of QXD or placebo medicine for 8 weeks. Primary endpoint was the change of body mass index(BMI) at 8 week from baseline. Secondary outcomes included the change of body composition, abdominal fat mass measured with Dual energy X-ray absorptiometry(DXA), blood pressure,lipid profiles and the homeostasis model assessment for insulin resistance(HOMA-IR).RESULTS: BMI was decreased in the QXD group sig-nificantly. Total body fat, abdominal fat mass measured with DXA Region of Interest and waist circumference(WC) showed a trend toward decreasing in the QXD group, but fat free mass was decreased in all groups. Triglyceride(Tg) was decreased in QXD group significantly, but WC, total cholesterol and high-density lipoprotein cholesterol were increased in both group. BP didn't change during the study period. HOMA-IR is decreased in both groups without group ***: 8-weeks of oral administrations of QXD(900 mg/d) reduces BMI, with a tendency of lose of total body fat mass, especially abdominal fat. It also significantly reduced serum Tg *** results suggest QXD could be used to treat obesity and metabolic risk factors. Further study is needed to confirm our pilot findings.

关键词： Qingxue Dan Obesity Hypertension Hyperlipidemias Insulin resistance Randomized controlled trail

The genetics of race differentiation——should it be studied?

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National Science Review 2023年第4期10卷 6-7页

作者： chung-I Wu NSR School of Life Sciences Sun Yat-sen University

In this issue, NSR publishes an article entitled ‘Expression profiles of east-west highly differentiated genes in Uyghur genomes’ by Ning et al.(2023) [1]. Briefly, it is about the regulation of gene expression in Uyghur genomes, which are admixed between Asian and European genomes. In evolutionary terms, this is a case of post-isolation secondary contact over a time span of thousands of years. In most other cases, such as African Americans, the admixture has a time span of years. Furthermore,

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