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Brokk Carries FIRSTGREEN Products
Brokk Inc. is now a dealer for FIRSTGREEN Industries' electric, zero-emission, and low-noise loaders. Brokk will carry the full line of FIRSTGREEN products, including the MiniZ 400, which is a compact, remote-controlled tracked loader. Small enough to lit through a standard doorway, the MiniZ 400 is ideal for interior demolition clean-up. The Rockcat Line is a low-profile, cabinless, electric skid steers with a loading capacity up to 2646 lb (1200 kg).
Trade Publication Article
Loaders
\"This search-and-find book invites emergent readers to look for new vocabulary words and pictures while giving simple facts about a loader's structure, parts, and jobs they do\"-- Provided by publisher.
Book
Simulation Study on the Scooping Trajectories of Loader Based on EDEM
This paper using DEM method to study the shovel scooping process of one time scooping, segregated scooping and composite scooping, finding a new bucket's trajectories and with the minimum shovel scooping resistance. And combined one time scooping with vertical lifting and segmented shovel loading with horizontal insertion phase, In the same full bucket rate situation, through many times simulations and experiments, composite scooping trajectory was modified which was based on the influence degree of Trajectory on resistance. Then the revised maximum horizontal resistance during composite scooping was 11% lower than before correction and vertical resistance decreased by 9%.The research provided theoretical foundation and practical support for loader's automatically scooping and intelligent resistance reduction.
Journal Article
Optimization method for the drive of a multipurpose single-bucket loader with a transforming working body
In this article discusses the relevance of the development and creation of a multipurpose single-bucket loader with a transforming working body with the reduction of the branches of the national economy, where machines and equipment with dump and bucket working bodies are successfully operated when performing basic construction and installation budget-forming works. Also, an analysis of the difference between a transforming working body and an adapting working body with fundamental differences is given, since there are no similar working bodies in the world with the ability to move from one type to another, like traditional separately existing road construction machines. As noted above, due to the design features of the proposed loader, the construction with descriptions given in detail with schematically and in the form of a calculation scheme, as well as the method of force calculation with obtaining a standard dynamic equation.
Journal Article
Foliar phloem infrastructure in support of photosynthesis
Acclimatory adjustments of foliar minor loading veins in response to growth at different temperatures and light intensities are evaluated. These adjustments are related to their role in providing infrastructure for the export of photosynthetic products as a prerequisite for full acclimation of photosynthesis to the respective environmental conditions. Among winter-active apoplastic loaders, higher photosynthesis rates were associated with greater numbers of sieve elements per minor vein as well as an increased apparent total membrane area of cells involved in phloem loading (greater numbers of cells and/or greater cell wall invaginations). Among summer-active apoplastic loaders, higher photosynthesis rates were associated with increased vein density and, possibly, a greater number of sieve elements and companion cells per minor vein. Among symplastic loaders, minor loading vein architecture (number per vein and arrangement of cells) was apparently constrained, but higher photosynthesis rates were associated with higher foliar vein densities and larger intermediary cells (presumably providing a greater volume for enzymes involved in active raffinose sugar synthesis). Winter-active apoplastic loaders thus apparently place emphasis on adjustments of cell membrane area (presumably available for transport proteins active in loading of minor veins), while symplastic loaders apparently place emphasis on increasing the volume of cells in which their active loading step takes place. Presumably to accommodate a greater flux of photosynthate through the foliar veins, winter-active apoplastic loaders also have a higher number of sieve elements per minor loading vein, whereas symplastic loaders and summer-active apoplastic loaders have a higher total number of veins per leaf area. These latter adjustments in the vasculature (during leaf development) may also apply to the xylem (via greater numbers of tracheids per vein and/or greater vein density per leaf area) serving to increase water flux to mesophyll tissues in support of high rates of transpiration typically associated with high rates of photosynthesis.
Journal Article
Test and Analysis of Loading Resistance of Loader
In this paper, the resistance of the bucket and the change of the resistance during the loading process of the loader are studied. In the automatic shovel loading test, the bucket tip trajectory during shovel loading is planned reasonably by matching the shovel loading method (moving arm cylinder displacement and steering cylinder displacement with the linkage of the vehicle). The gravel material in the shovel loading test is analyzed. The shovel-loading process can be divided into the bucket insertion and shovel digging stages, and the resistance in the two stages was analyzed separately in terms of trajectory. It is obtained that the horizontal insertion resistance is proportional to the insertion depth of the shovel, the change of the resistance, the change of the resistance direction, and the trajectory of the shovel during the shovel excavation stage.
Journal Article
MSHA Publishes Three Fatality Alerts
According to the report, the incident occurred because the mine operator did not ensure that the dump point could support the weight of the loaded haul truck, conduct an adequate examination to verify that the truck operator dumped material at a safe distance from the edge of the point, or ensure that the truck operator wore a seatbelt. According to MSHA, the incident occurred because the loader operator was moving the loader in a manner that caused the pallet of stone to block his visibility of the staging platform and the miner. According to the report, the incident occurred because the mine operator did not support or otherwise control the rib to protect miners and did not conduct adequate preshift examinations.
Journal Article
Analysis and Experimental Research on Shifting Impact of Loader Transmission
The evaluation index of loader shift quality was analysed, and the model of the evaluation index was established. The main causes of the shift impact of the transmission were analysed, and it was concluded that the disturbance caused by the torque of the transmission output shaft had a direct relationship with the oil filling and discharging rule in the clutch and the change in oil pressure. Based on theoretical analysis, an accurate control strategy of a proportional solenoid valve to realize electro-hydraulic proportional closed-loop buffering control was proposed. The buffer control of the transmission shift is performed by using this method. The effectiveness of the control strategy was verified by the experiment of the shift oil pressure. The shift impact of the transmission was reduced, and the loader shift quality was improved.
Journal Article
Structure of the human clamp loader reveals an autoinhibited conformation of a substrate-bound AAA+ switch
DNA replication requires the sliding clamp, a ring-shaped protein complex that encircles DNA, where it acts as an essential cofactor for DNA polymerases and other proteins. The sliding clamp needs to be opened and installed onto DNA by a clamp loader ATPase of the AAA+ family. The human clamp loader replication factor C (RFC) and sliding clamp proliferating cell nuclear antigen (PCNA) are both essential and play critical roles in several diseases. Despite decades of study, no structure of human RFC has been resolved. Here, we report the structure of human RFC bound to PCNA by cryogenic electron microscopy to an overall resolution of ∼3.4 Å. The active sites of RFC are fully bound to adenosine 5′-triphosphate (ATP) analogs, which is expected to induce opening of the sliding clamp. However, we observe the complex in a conformation before PCNA opening, with the clamp loader ATPase modules forming an overtwisted spiral that is incapable of binding DNA or hydrolyzing ATP. The autoinhibited conformation observed here has many similarities to a previous yeast RFC:PCNA crystal structure, suggesting that eukaryotic clamp loaders adopt a similar autoinhibited state early on in clamp loading. Our results point to a “limited change/induced fit” mechanism in which the clamp first opens, followed by DNA binding, inducing opening of the loader to release autoinhibition. The proposed change from an overtwisted to an active conformation reveals an additional regulatory mechanism for AAA+ ATPases. Finally, our structural analysis of disease mutations leads to a mechanistic explanation for the role of RFC in human health.
Journal Article