Results 71 to 80 of about 72,914 (171)

Safety and efficacy of a feed additive consisting of muramidase produced with Trichoderma reesei DSM 32338 (Balancius™) for laying hens (DSM nutritional products)

EFSA Journal, Volume 22, Issue 5, May 2024.
Abstract Following a request from the European Commission, EFSA was asked to deliver a scientific opinion on the safety and efficacy of muramidase produced with Trichoderma reesei DSM 32338 (Balancius™) as a feed additive for laying hens. The additive is already authorised as a zootechnical additive (functional group: other zootechnical additives) for ...
EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), Vasileios Bampidis, Giovanna Azimonti, Maria de Lourdes Bastos, Henrik Christensen, Birgit Dusemund, Mojca Durjava, Maryline Kouba, Marta López‐Alonso, Secundino López Puente, Francesca Marcon, Baltasar Mayo, Alena Pechová, Mariana Petkova, Fernando Ramos, Roberto Edoardo Villa, Ruud Woutersen, Andrey Yurkov, Montserrat Anguita, Matteo L. Innocenti, Fabiola Pizzo, Daniel Pagés Plaza, Elisa Pettenati, Jordi Ortuño   +23 more
wiley   +1 more source

Digital divides among microenterprises: Evidence from sub‐Saharan Africa

Journal of International Development, Volume 36, Issue 2, Page 1350-1380, March 2024.
Abstract This paper investigates digital inequalities in usage within African informal sectors. In particular, we examine whether the uneven digital diffusion is embedded in pre‐existing socio‐economic inequalities. After identifying three segments of informal firms, we rely on multivariate and decomposition analyses to identify predictors of usage of ...
Damien Girollet
wiley   +1 more source

Undifferenced precise time transfer with information‐constraints

IET Radar, Sonar &Navigation, Volume 18, Issue 3, Page 410-422, March 2024.
The undifferenced precise time transfer method based on information constraints could effectively be used to smooth the clock difference sequence of the receiver and the clock difference sequence of the time transfer link. This method can also be used to reflect the performance of atomic clocks at GPS stations and is better suited for the precise time ...
Mingyue Liu, Rui Tu, Qiushi Chen, Qi Li, Junmei Chen, Pengfei Zhang, Xiaochun Lu   +6 more
wiley   +1 more source

BDSet: A First-ever BDS Satellite-based PPP Augmentation Dataset Since 2023

Scientific Data
The BDS precise point positioning (PPP) service broadcasts state space representation (SSR) corrections via PPP-B2b augmentation signals. To maximize research potentials of the service, this study develops a first-ever BDS PPP-B2b augmentation dataset ...
Chenhao Ouyang, Junbo Shi, Cheng Hou, Wenjie Peng, Jiming Guo, Yibin Yao   +5 more
doaj   +1 more source

Analysis and Assessment of BDS‐3 Five Single‐Frequency Civilian Signals Single Point Positioning Considering Time Group Delay and Intersignal Correction

International Journal of Aerospace Engineering, Volume 2024, Issue 1, 2024.
The BeiDou Global Navigation Satellite System (BDS‐3) has been providing global positioning, navigation, and timing (PNT) services for over 3 years. Single‐frequency single point positioning (SPP) receivers have significant advantages such as low hardware cost and easy implementation, making them widely used in engineering practice.
Xingli Sun, Dakun Sun
wiley   +1 more source

Considering Inter-Frequency Clock Bias for BDS Triple-Frequency Precise Point Positioning

Remote Sensing, 2017
The joint use of multi-frequency signals brings new prospects for precise positioning and has become a trend in Global Navigation Satellite System (GNSS) development. However, a new type of inter-frequency clock bias (IFCB), namely the difference between
Lin Pan, Xingxing Li, Xiaohong Zhang, Xin Li, Cuixian Lu, Qile Zhao, Jingnan Liu   +6 more
doaj   +1 more source

Precise LEO orbit determination using regional PPP-B2b augmentation services

Abstract The PPP-B2b service broadcasted by BDS-3 GEO satellites can provide centimeter to decimeter-level positioning accuracy in China and surrounding area. As a free satellite based-augmentation system, BDS PPP-B2b service also potentially benefits the low earth orbit (LEO) space users to improve the orbit determination accuracy.
Haitao Zhou, Lei Wang, Ruizhi Chen, Jiansheng Li, Mingjian Chen, Linyang Li, Wenju Fu   +6 more
openaire   +1 more source

Integrated real-time precise point positioning system with B2b/B2a/B1C services

Satellite Navigation
Real-Time Precise Point Positioning (RTPPP) technology is one of the most important means of positioning and navigation, whereas this type of service requires Internet access.
Zhetao Zhang, Hao Wang, Yuanxi Yang
doaj   +1 more source

An investigation of PPP-B2b coverage and its performance in ZTD estimation and positioning in different regions

Survey Review
This study comprehensively evaluates the Beidou navigation satellite system's PPP-B2b service for real-time positioning and zenith total delay (ZTD) estimation. Despite its operational status, PPP-b2b's effective coverage is underexplored. We define this
Xiaoming Wang, Kai Zhou, Jinglei Zhang, Haobo Li, Hong Liang, Manhong Tu, Yufei Chen, Cong Qiu, Li Li   +8 more
semanticscholar   +1 more source

Analyzing the Precise Point Positioning Performance of Different Dual-Frequency Ionospheric-Free Combinations with BDS-3 and Galileo

Atmosphere
The BeiDou global navigation satellite system (BDS-3) and Galileo systems both broadcast satellite signals on five frequencies, which can form many observation combinations with dual-frequency ionospheric-free (DFIF) precise point positioning (PPP). This
Xingli Sun, Zhan Shu, Jinjie Yao
doaj   +1 more source