Results 221 to 230 of about 34,263 (308)

The law of gas distribution in goaf of fully mechanized top-coal caving working face with "double-U" ventilation system

, 2011
Zhou Chun-shan
openalex   +1 more source

Labour Dynamics, Factor Substitution and Capital Adoption in Sub‐Saharan African Agriculture

Journal of Agricultural Economics, Volume 77, Issue 1, Page 183-204, February 2026.
ABSTRACT Ongoing structural transformations in many Sub‐Saharan African (SSA) economies are driving changes in labour inputs and wages, likely influencing smallholder agriculture and the direction of agricultural intensification processes. At the same time, the adoption of capital‐intensive technologies still remains puzzlingly low.
Pranav Patil, Franziska Schuenemann, Kenneth Strzepek   +2 more
wiley   +1 more source

Attitude monitoring method for hydraulic support in fully mechanized working face based on PSO-ELM

Gong-kuang zidonghua
In response to the problems of cumulative errors and inaccurate correction results in the attitude calculation method of hydraulic supports based on inertial measurement units, a fully mechanized working face hydraulic support attitude monitoring method based on particle swarm optimization (PSO) - extreme learning machine (ELM) is proposed.
LI Lei, XU Chunyu, SONG Jiancheng, TIAN Muqin, SONG Danyang, ZHANG Jie, HAO Zhenjie, MA Rui   +7 more
openaire   +1 more source

Distribution law of gas and change rule of "three zones" in the goaf of fully mechanized top-coal caving working face under the continuous nitrogen injection

, 2011
Yuguo Wu, Jianming Wu, Dongpo Zhang, Zhou Chun-shan   +3 more
openalex   +1 more source

Research on the Law of Top Coal Movement and Influence Factors of Coal Caving Ratio for Fully Mechanized Top Coal Caving Working Face [PDF]

Jinhu Zhang, Zhiheng Cheng, Sheng Lei, Kai Guo, Liang Chen, Zherui Zhang, Jiahui Chen   +6 more
openalex   +1 more source

By‐employment in the Yangtze Valley in the long twentieth century: Specialization, structural change, and the land systems

The Economic History Review, Volume 79, Issue 1, Page 3-30, February 2026.
Abstract Evidence on by‐employment in long‐run economic development is limited in existing literature worldwide. This study constructed a new dataset comprising 74 515 occupational observations with 4890 by‐employed individuals derived from Chinese lineage genealogies.
Ying Dai
wiley   +1 more source

Air leakage characteristics and comprehensive prevention of goaf side retained roadway of fully mechanized mining faces in Qincheng coal mine. [PDF]

Sci Rep
Luo X, Chen L, Wu B, Sun M, Yang T, Yu H.   +5 more
europepmc   +1 more source

Analysis of overburden structure and support working resistance of working face in fully-mechanized top coal caving with large mining height in ultra thick coal seam

, 2017
Yunbing Hou, He Shangsen, Zhou Dianqi, Shuai Han, Yu Zhou   +4 more
openalex   +1 more source

Child labour and industrialization: Evidence from factory records and the 1851 British census

The Economic History Review, Volume 79, Issue 1, Page 163-188, February 2026.
Abstract Children were an integral part of the workforce during the British Industrial Revolution. The changing patterns of child labour as well as the causes behind its rise and fall have generated much scholarly debate. This study brings in new direct evidence on child labour from children's age certificates and school attendance records from cotton ...
Xuesheng You, Alexander Tertzakian
wiley   +1 more source

Research on evaluation method for airflow control effect of long-pressure and short-suction dust removal system in heading faces. [PDF]

Sci Rep
Zheng L, Xu S, Ding Z, Xu Y.
europepmc   +1 more source