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1,156 results on '"Zhao, Zhenzhen"'

202. A single-station empirical TEC model based on long-time recorded GPS data for estimating ionospheric delay

Author

Zhao Zhenzhen, Feng Jiandi, Han Baomin, and Wang Zhengtao

Subjects
empirical TEC models, ionospheric delay, single station, GPS data, Meteorology. Climatology, QC851-999
Abstract

Globally distributed GPS (global positioning system) stations have been continuously running for nearly 20 years, thereby accumulating numerous observations. These long-time recorded GPS data can be used to calculate continuous total electron content (TEC) values at single stations and provide an effective modeling dataset to establish single-station empirical TEC models. In this paper, a new empirical TEC model called SSM-T1 for single stations is proposed on the basis of GPS data calculated by IONOLAB-TEC application from 2004 to 2015. The SSM-T1 model consists of three parts: diurnal, seasonal, and solar dependency variations, with 18 coefficients fitted by the nonlinear least-squares method. The SSM-T1 model is tested at four stations: Paris (opmt), France; Bangalore (iisc), India; Ceduna (cedu), Australia; and O’Higgins (ohi3) over the Antarctic Peninsula. The RMS values of the model residuals at these four stations are 3.22, 4.46, 3.28, and 3.83 TECU. Assessment results show that the SSM-T1 model is in good agreement with the observed GPS-TEC data and exhibits good prediction ability at the Paris, Bangalore, and Ceduna stations. However, at the O’Higgins station, the SSM-T1 model seriously deviates from the observed GPS-TEC data and cannot effectively describe the variation of mid-latitude summer night anomaly.

Published
2018
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203. A System for Web Widget Discovery Using Semantic Distance between User Intent and Social Tags

Author

Zhao, Zhenzhen, Huang, Xiaodi, Crespi, Noël, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Aberer, Karl, editor, Flache, Andreas, editor, Jager, Wander, editor, Liu, Ling, editor, Tang, Jie, editor, and Guéret, Christophe, editor

Published
2012
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204. On Semantics in Onto-DIY

Author

Demey, Yan Tang, Zhao, Zhenzhen, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Herrero, Pilar, editor, Panetto, Hervé, editor, Meersman, Robert, editor, and Dillon, Tharam, editor

Published
2012
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211. The Incoming Trends of End-User Driven Service Creation

Author

Zhao, Zhenzhen, Laga, Nassim, Crespi, Noel, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin (Sherman), Series editor, Stan, Mircea, Series editor, Xiaohua, Jia, Series editor, Zomaya, Albert, Series editor, Coulson, Geoffrey, Series editor, Telesca, Luigi, editor, Stanoevska-Slabeva, Katarina, editor, and Rakocevic, Veselin, editor

Published
2010
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217. Transcriptome-Wide Identification of Cytochrome P450s and GSTs from Spodoptera exigua Reveals Candidate Genes Involved in Camptothecin Detoxification.

Author

Zhao, Zhenzhen, Zhang, Lan, Zhang, Yanning, Mao, Liangang, Zhu, Lizhen, Liu, Xingang, and Jiang, Hongyun

Subjects
BEET armyworm, GLUTATHIONE transferase, CAMPTOTHECIN, GENE expression, FAT cells, GENES, CYTOCHROME P-450, LARVAE
Abstract

The application of camptothecin (CPT) and its derivatives to control insect pests has generated significant interest. This study investigated the enzymatic response of cytochrome P450 monooxygenase (CYP) and glutathione S-transferase (GST) genes in the fat body cells of Spodoptera exigua after 10 μM CPT treatment. Additionally, we examined the effects of CPT on the growth and development of S. exigua larvae and detected the relative expression levels of selected CYP and GST genes during the CPT treatment period. Twenty-one CYP and 17 GST genes were identified from the fat body cells of S. exigua by comparative transcriptomic analyses. The relative expression of ten CYP and seven GST genes changed significantly, which suggested that these CPYs and GSTs may be involved in CPT metabolism. During exposure to CPT for 10 days, the development of S. exigua larvae was delayed and was characterized by weight inhibition and a prolonged period of development. The relative expression levels of the selected four CYP genes, CYP9A27, CYP9A186, CYP337B5, CYP321A8, and one GST gene, GSTe7, were significantly changed by CPT treatment compared to the control group. These generated data provide a basis for identifying the CPT metabolism/detoxification genes of S. exigua at the molecular level. [ABSTRACT FROM AUTHOR]

Published
2023
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248. When is brand content shared on Facebook? A field study on online Word-of-Mouth.

Author

Haikel-Elsabeh, Marie, Zhao, Zhenzhen, Ivens, Björn, and Brem, Alexander

Subjects
SOCIAL media in marketing, WORD of mouth advertising, CUSTOMER relations, CONSUMER behavior, INTERNET users
Abstract

When implementing social media strategies on Facebook brand pages, companies focus on factors that prompt electronic Word-of-Mouth (eWoM) about brand contents. This study examines individual and collective factors that lead to brand content sharing behaviors. The research conducts a field study of a real brand on its Facebook fan page to gather actual behavioral data. Both declarative and behavioral data are used to explain brand eWoM, based on 250 participants. Empirical results show that the Facebook activity has a positive influence on brand content sharing for active users (posters) but not for nonactive users (lurkers), while brand engagement positively affects brand content sharing for both active and nonactive users. Furthermore, brand community involvement does not have an influence on brand content sharing. Findings offer companies useful recommendations for using the determinants included in our research design to understand and analyze the sharing behaviors of users. [ABSTRACT FROM AUTHOR]

Published
2019
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249. Heterogeneous Fleets for Green Vehicle Routing Problem With Traffic Restrictions

Author

Wang, Heng, Li, Menghan, Wang, Zhenyu, Li, Wei, Hou, Tianjiao, Yang, Xianyi, Zhao, Zhenzhen, Wang, Zhenfeng, and Sun, Tong

Abstract

Suffering from environmental distress like carbon emissions, traffic restrictions have been enforced extensively in distribution logistics. Reasonable arrangement of urban freight transportation can effectively improve distribution efficiency, reduce distribution costs, and alleviate the impact of traffic restrictions in distribution logistics. In response to increasingly stringent traffic restrictions, we establish a multi-objective optimization model, including the minimum distributions and the minimum carbon emissions. Given that the limits of battery capacity and cargo capacity, we build a green vehicle routing problem with soft time windows (GVRPTW) model with heterogenous fleets. In this study, three different factors, that is restricted area, travel time of vehicles, and carbon tax prices, are discussed in details. In order to solve the NP-hard model, we propose an improved ant colony optimization algorithm (IACO) by optimizing the state transition probability, and verifies the worth of the algorithm. The experimental results can explore the impacts of traffic restriction policies on the formulation of distribution scheme and offer reference opinions for the government to formulate reasonable restriction policies and better guide logistics enterprises to reduce carbon emissions.

Published
2023
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