The Numerical Simulation Analysis of Flow Field in Level Control Valve of Water Storage Tank

Yaping Wang,Lei Gao,Jianghua Ge,Han Gao,Jing Zhang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10

Level control valve of water storage tank is installed in the outlet of tank, which control the water level of water storage tank by adjusting the water emissions, which make great significance for the safe operation of the super (super) criticality thermal power unit boiler . Complete the simulation analysis of internal flow field by the method of numerical simulation ,in order to achieve structure improvements of level control valve of water storage tank, that make level control valve of water storage tank better meet the work requirements. Establish flow channel model and mesh models of level control valve of water storage tank in various stages of the open process. Make three dimensional viscous numerical simulation of the internal complex flow field by the computational fluid dynamics software of ANSYS CFX. The error between the simulation values of the flow coefficient and the theoretical values , trial values is less than 5% ,which verifies the correctness of the simulation results . Get pressure contour , velocity streamline diagrams and outlet mass flow of level control valve of water storage tank in various stages of the open process. According to the pressure contours and velocity streamline diagrams, make detailed analysis of the flow field of level control valve of water storage tank. According to the dates of outlet mass flow, fit the flow characteristic curve of level control valve of water storage tank. Provide a theoretical basis for the structural design of level control valve of water storage tank.

Research on Design Method of Modularized Configuration for Cluster Order Demand

Ge Jianghua,Wang Yaping,Gao Lei,Shi Yunpeng 보안공학연구지원센터(IJUNESST) 2013 International Journal of u- and e- Service, Scienc Vol.6 No.4

Color Prediction for Pre-Colored Cotton Fiber Blends Based on Improved Kubelka-Munk Double-Constant Theory

Ge Zhang,Jian Zhou,Ruru Pan,Lei Wang,Weidong Gao 한국섬유공학회 2021 Fibers and polymers Vol.22 No.2

The accuracy of color prediction results for pre-colored fiber blends is critical in the textile industry. In this paper,we attempt to investigate a feasible method for predicting the color of pre-colored fibers blends. Five pre-colored cottonfibers were divided into two groups, one for achromatic primaries (white and black) and one for chromatic primaries (red,blue, and yellow). Their respective absorption coefficient (K) and scattering coefficient (S) were calculated by the leastsquares method from the prepared fiber blends samples. The color information of the 34 test blending samples including twoprimaryand three-primary was predicted by the improved Kubelka-Munk (K-M) double-constant theory. Comparing withthe measurement results, the minimum and maximum DE00 color differences were 0.215 and 1.890. The variance of colordifference for two-primary samples was 0.128 and for three-primary samples was 0.154, both were smaller than that obtainedby the K-M theory relative value method, the Stearns-Noechel (S-N) model, revised S-N models, and the Friele model. Theresults show that the improved K-M double-constant theory can be used to better predict the color blending effect of precoloredfibers.

Two Maternal Lineages Revealed by Mitochondrial DNA D-loop Sequences in Chinese Native Water Buffaloes (Bubalus bubalis)

Lei, Chu-Zhao,Zhang, Wei,Chen, Hong,Lu, Fan,Ge, Qing-Lan,Liu, Ruo-Yu,Dang, Rui-Hua,Yao, Yun-Yi,Yao, Li-Bo,Lu, Zi-Fan,Zhao, Zhong-liang Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.4

Little is known about the origin and genetic diversity of swamp buffaloes in China. To obtain more knowledge on genetics of the water buffalo in China, the complete mitochondrial D-loop sequences of 30 samples from 6 native types were investigated. The results revealed 12 mitochondrial haplotypes with 50 polymorphic sites. Among these polymorphic sites, there were 49 transitions and 1 transversion. The average nucleotide diversity and haplotype diversity estimated from mtDNA D-loop region in 6 Chinese water buffalo types were 0.00684 and 0.798, respectively, showing rather abundant mitochondrial genetic diversity. The Neighbor-Joining (NJ) tree of mtDNA of Chinese water buffaloes was constructed according to the 12 haplotypes. The NJ tree indicated two lineages being designated lineage A and lineage B, in which lineage A was predominant, and lineage B was at low frequency. The new lineage B was first discovered and defined in 6 Chinese water buffalo types. These results showed that two different maternal lineages were involved in the origin of domestic swamp buffaloes in China and the lineage B was probably an introgression from Southeast Asian buffaloes.

Overexpression of the AtSTK Gene Increases Salt, PEG and ABA Tolerance in Arabidopsis

Lei Bing,Cui-Cui Feng,Jing-Lan Li,Xiao-Xu Li,Baocun Zhao,Yin-Zhu Shen,Zhan-Jing Huang,Rong-Chao Ge 한국식물학회 2013 Journal of Plant Biology Vol.56 No.6

AtSTK (At5g02800), which is a serine-threonineprotein kinase gene of Arabidopsis thaliana, was cloned, andits function was studied. The study found that the overexpressionof AtSTK could significantly improve the ability of A. thaliana to tolerate salt, PEG, and ABA stresses. RT-PCRanalysis revealed that the expression of the AtSTK genecould be obviously induced by salt, PEG, and ABA. Theexamination of the physiological characteristics showed thatthe overexpression of AtSTK in Arabidopsis significantlyreduced the plasma membrane permeability, significantlyincreased the proline content, and decreased the MDA content. These changes may reflect the physiological mechanismsthrough which AtSTK overexpression improves stress resistancein Arabidopsis. In addition, the overexpression of the AtSTKgene significantly antagonised the inhibitory effect of highconcentrations of exogenous ABA on Arabidopsis seedgermination. The subcellular localisation results showed thatAtSTK is located in both the cytosol and the nucleus. Theexamination of its tissue-specific expression showed thatAtSTK is expressed in various Arabidopsis tissues and isparticularly strongly expressed in the vessels. The signallingpathway analysis indicated that AtSTK might transfer thesalt stress signal in Arabidopsis through the MAPK pathway.

African Maternal Origin and Genetic Diversity of Chinese Domestic Donkeys

Lei, Chu-Zhao,Ge, Qing-Lan,Zhang, Hu-Cai,Liu, Ruo-Yu,Zhang, Wei,Jiang, Yong-Qing,Dang, Rui-Hua,Zheng, Hui-Ling,Hou, Wen-Tong,Chen, Hong Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.5

The origin of domestic donkeys in China has been controversial. To clarify the origin of Chinese domestic donkeys, we investigated the partial mitochondrial D-loop sequences of 126 samples from 12 native breeds. The results revealed two mitochondrial origins, lineage Somali and lineage Nubian of African wild ass detected in Chinese domestic donkeys. Lineage Somali was predominant in Chinese domestic donkey breeds. The pattern of genetic variation in ass mtDNA D-loop sequences indicated that the two lineages Somali and Nubian from China had undergone population expansion events. In a combined analysis of lineages Somali and Nubian between previously published sequences from other countries/regions and sequences of Chinese domestic donkeys, the results indicated that the two lineages of Chinese domestic donkeys were from Africa and supported the African maternal origins of Chinese domestic donkeys. There was no obvious geographical structure in Chinese domestic donkey breeds, but the population showed abundant mtDNA diversity. The spread routes of Chinese domestic donkeys were also discussed.

AFSO: An Adaptative Frame Size Optimization Mechanism for 802.11 Networks

( Xiaohu Ge ),( Cheng-xiang Wang ),( Yang Yang ),( Lei Shu ),( Chuang Liu ),( Lin Xiang ) 한국인터넷정보학회 2010 KSII Transactions on Internet and Information Syst Vol.4 No.3

In this paper, we analyze the impact of different frame types on self-similarity and burstiness characteristics of the aggregated frame traffic from a real 802.11 wireless local area network. We find that characteristics of aggregated frame traffic are affected by both mean frame size and the proportion of specified frame types. Based on this new knowledge, an adaptative frame size optimization (AFSO) mechanism is proposed to improve the transmission efficiency by adaptively adjusting data frame size according to the proportions of different frame types. Simulation results show that our proposed mechanism can effectively regulate the burstiness of aggregated frame traffic and improve the successful delivery rate of data frames when a fixed throughput target is set for 802.11 wireless networks.

Characterization of clutch traits and egg production in six chicken breeds

Shi Lei,Li Yunlei,Isa Adam Mani,Ma Hui,Yuan Jingwei,Wang Panlin,Ge Pingzhuang,Gong Yanzhang,Chen Jilan,Sun Yanyan 아세아·태평양축산학회 2023 Animal Bioscience Vol.36 No.6

Objective: The better understanding of laying pattern of birds is crucial for developing breed-specific proper breeding scheme and management. Methods: Daily egg production until 50 wk of age of six chicken breeds including one layer (White Leghorn, WL), three dual-purpose (Rhode Island Red, RIR; Columbian Plymouth Rock, CR; and Barred Plymouth Rock, BR), one synthetic dwarf (DY), and one indigenous (Beijing-You Chicken, BYC) were used to characterize their clutch traits and egg production. The age at first egg, egg number, average and maximum clutch length, pause length, and number of clutches and pauses were calculated accordingly. Results: The egg number and average clutch length in WL, RIR, CR, and BR were higher than those in DY and BYC (p<0.01). The numbers of clutches and pauses, and pause length in WL, RIR, CR, and BR were lower than those in DY and BYC (p<0.01). The coefficient variations of clutch length in WL, RIR, CR, and BR (57.66%, 66.49%, 64.22%, and 55.35%, respectively) were higher than DY (41.84%) and BYC (36.29%), while the coefficient variations of egg number in WL, RIR, CR, and BR (9.10%, 9.97%, 10.82%, and 9.92%) were lower than DY (15.84%) and BYC (16.85%). The clutch length was positively correlated with egg number (r = 0.51 to 0.66; p<0.01), but not correlated with age at first egg in all breeds. Conclusion: The six breeds showed significant different clutch and egg production traits. Due to the selection history, the high and median productive layer breeds had higher clutch length than those of the less productive indigenous BYC. The clutch length is a proper selection criterion for further progress in egg production. The age at first egg, which is independent of clutch traits, is especially encouraged to be improved by selection in the BYC breed.

Timosaponin AIII induces apoptosis and autophagy in human melanoma A375-S2 cells

Ye Wang,Lei Xu,Li-Li Lou,Shao-Jiang Song,Guo-Dong Yao,Meng-Yao Ge,Toshihiko Hayashi,Shin-ichi Tashiro,Satoshi Onodera,Takashi Ikejima 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.1

Timosaponin AIII (AIII), a steroidal saponinisolated from Anemarrhena asphodeloides Bge. Our studyshowed that AIII induced both apoptosis and autophagy,and autophagy inhibited apoptosis in A375S2 cells. Furtherly,this study was carried out to investigate what kindof cytokines plays an important role in this process. Theresults revealed that AIII induced apoptosis through activatingc-Jun N-terminal protein kinase (JNK) or extracellularsignal related kinase (ERK) signaling pathway andgenerating NO. However, JNK or ERK inhibited autophagy,while NO had no effect on autophagy. Therefore,JNK, ERK or NO regulates two programmed death processesin different ways. AIII did not show obvious cytotoxiceffect on human peripheral blood mononuclear cells,which indicated that AIII has less side effects on normalcells, and could be considered as a leading compound fordeveloping novel anticancer drug.

Variation Regularity of Key Performance Indexes Against the Slot Number of Tooth-Coil PMSMs

Zhu Zichong,Ge Wenjie,Mei Lei,Huang Yunkai 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4

Tooth-coil permanent magnet synchronous machines (TC-PMSMs) are commonly used in wind power generation and wheelhub propulsion applications. These machines operate at low speeds and have a large number of poles and slots, providing various pole/slot combinations as options. Typically, these combinations have similar performances, making it challenging to choose the best one from diff erent perspectives. This study focuses on 32-pole TC-PMSMs with diff erent slot numbers to understand how key electromagnetic and thermal performance indicators vary with slot numbers. Using the fi nite element method, parameters such as torque density, cogging torque, inductance, fl ux-weakening capability, losses, and temperature rise are evaluated and compared. Prototypes of the wheel-hub TC-PMSM are manufactured and tested on a back-to-back test rig, to validate the analysis results. The fi ndings and conclusions derived from this research can assist in determining the optimal slot number or narrowing down the selection range of competitive pole/slot combinations during the scheme comparison stage.