Flux modulated rotating pole piece magnetic gear

In this paper, the CMG is re-condition so that the pole piece act as the outer rotor instead of surface mount PM. This magnetic coupling of the CMG is similar to the conventional CMG which uses harmonic to transfer the torque and speed from the inner rotor to the outer rotor. The working principle of the proposed CMG is derived analytically and simulated using finite element software. For this recondition, the PM at the outer section become stationary hence, retaining sleeve can be removing. The proposed MG produced 18% higher average torque than the conventional MG with drawback in torque ripple. The proposed CMG also produce higher gear ratio than the same pole pair of conventional CMG.

Emulation of metamaterial waveguides

In this work, we are interested by emulating metamaterial microwave waveguides which behave like conventional metallic ones. We use metamaterial layers based on two types of unit cells. The first one is a connected cross type unit cell which leads to a metamaterial with a near zero refraction index (n1≈ 0). The second one is a disconnected cross type unit cell which leads to a metamaterial with a refraction index greater than unity (n2 >1). With these two type of metamaterials we can define, in the metamaterial layer, different sections each one can have a refraction index equal to n1 or n2. Using these metamaterial layers we can build a metamaterial waveguide. This latter is obtained by stacking a number of layers. The waveguide is obtained by selecting an inner section with a refraction index n2 and an outer section with a refraction index n1 close to zero which plays a similar role as a metallic reflector to form the waveguide.

Modeling process of cutting of tree crowns and shrubs of green plantations

For silvicultural care of green plantings in cities and towns new design of a working body with a circular saw mounted on the manipulator has been developed. The machine comprises a lifting mechanism with hydraulic cylinder, which is mounted on the rotating column. On a rotating column the lower section of the boom is installed, to which by a cylindrical hinge middle section of the boom and hydraulic cy-linder of control is attached. The upper part of the middle section of the boom by a cylindrical hinge is connected to the outer section equipped with a hydraulic cylinder of control. Inside the outer section mounted steering gear rod around its longitudinal axis.

The Performance Evaluation of Potassium Drilling Fluid System

The basic prescription of the potassium sulfate drilling fluid is: 5% bentonite+0.4%Na2CO3+5.0%K2SO4+1000ppmDCL+200ppmDesco+100ppmAlcome+500ppmSAP+1000ppmLT+1000ppmKEL. The content of K+ is 50000mg/L. The drilling fluid has appropriate viscosity, gel and filter loss. The shale rolling recovery rate is bigger than 85%. The static swelling rate is smaller than 2%. The corn damage is less than 20%. The mechanism of protect formation is the K+ ability of preventing the clay from hydrating and swelling, the adsorption ability of formation protecting agent and the cooperating role of K+ and formation protecting agent. The potassium sulfate drilling fluid was used in fang-3 outer section of the Song-fang-tun oilfield. It was shown that the drilling fluid could meet the drilling demand in this oilfield.

Time-related changes in specific gravity and moisture content of spruce budworm killed balsam fir

The variation in specific gravity and moisture content of healthy balsam fir (Abiesbalsamea (L.) Mill.) and balsam fir killed by the spruce budworm (Choristoneurafumiferana Clem.) in northern Minnesota has been investigated. Disks were removed at 100-in. (254-cm) intervals along the merchantable boles of 31 healthy trees, 16 trees dead 6 months, 42 trees dead 12months, and 18 trees dead 22 months. Knot-free wedges were cut from the disks and separated into inner and outer sections for specific gravity and moisture content determinations. Outer and inner sections' specific gravity averages for healthy (control) balsam fir varied within tree, decreasing then increasing with height. This trend was not apparent for the outer section specific gravity averages in the dead tree categories. Average specific gravities for the four tree categories were not significantly different even 22 months after death. Tree categories' average moisture content rapidly decreased with time after death, and significant differences were detected within months of tree death. Significant outer section moisture losses occurred within 6 months after death, while significant inner section losses developed after 12 or more months.

THE PETROLEUM GEOLOGY OF THE OUTER DAMPIER SUB-BASIN

The Dampier Sub-basin represents the northern part of a depositional downwarp along the Western Australian coast within the greater Carnarvon Basin. The sub-basin can be separated into an inner and outer section by the depositional Lewis Trough, which drilling and seismic results indicate to have been active since at least earliest Jurassic times.The Dampier Sub-basin originated as an intracratonic depocentre at the end of the Carboniferous and has developed progressively into a marginal basin at the present day. The oldest sediments penetrated to date in the outer area are fluviatile Upper Triassic clastics. Well data have shown that sedimentation continued without a break from the Late Triassic until the late Middle Jurassic, with gradually increasing marine influences. This phase of deposition was terminated by uplift in the Early Callovian, resulting in the emergence of various parts of the basin. These areas were transgressed at different stages, but by the late Early Cretaceous a marine environment was firmly established over the whole region.Eleven hydrocarbon accumulations have been discovered to date in the Outer Dampier Sub-basin where the primary hydrocarbon generating section is believed to consist of pre- Upper Cretaceous shales, particularly in the Lewis Trough. The feature of major relevance to the petroleum geology is the Rankin Platform where the main discoveries occur in Triassic to Lower Jurassic reservoirs. Trapping is provided primarily by the drape and differential compaction of Cretaceous shales over the pre-tectonic horsts, but the water level in individual fields appears to depend on a combination of both drape and fault trapping. In the Angel Field, on the Madeleine Trend, hydrocarbons occur in Tithonian sands within a fold structure sealed by conformable Cretaceous shales.