Seepage effects of groundwater and its make-up water on triggering ground subsidence

The functioning mechanism of groundwater and its make-up water in the process of ground subsidence was studied from such three aspects as osmotic corrasion, osmotic pressure effect and concretion effect, As to osmotic corrasion, its forming conditions, mechanical mechanism and process were analyzed, As to osmotic pressure effect, it was mainly studied from hydrostatic pressurizing effect, sop softening effect and negative pressure sealing effect. Through concretion and saturation of soil, the factors of concretion settlement were analyzed. The results showed that both groundwater and its make-up water are important triggering factors to ground subsidence.

VE系列箱体Break-out Box的故障分析

本文阐述了VE系列控制箱体Break-out Box的功能。文章根据实际生产中出现的Break-out Box故障及其修复过程中出现的问题进行分析,并纠正了电子连线原理图的错误连接点。

Risk of shear failure and extensional failure around over-stressed excavations in brittle rock

The authors investigate the failure modes surrounding over-stressed tunnels in rock.Three lines of investigation are employed:failure in over-stressed three-dimensional(3D) models of tunnels bored under 3D stress,failure modes in two-dimensional(2D) numerical simulations of 1000 m and 2000 m deep tunnels using FRACOD,both in intact rock and in rock masses with one or two joint sets,and finally,observations in TBM(tunnel boring machine) tunnels in hard and medium hard massive rocks.The reason for 'stress-induced' failure to initiate,when the assumed maximum tangential stress is approximately(0.4-0.5)σ_c(UCS,uniaxial compressive strength) in massive rock,is now known to be due to exceedance of a critical extensional strain which is generated by a Poisson's ratio effect.However,because similar 'stress/strength' failure limits are found in mining,nuclear waste research excavations,and deep road tunnels in Norway,one is easily misled into thinking of compressive stress induced failure.Because of this,the empirical SRF(stress reduction factor in the Q-system) is set to accelerate as the estimated ratio σ_(θmax)/σ_c >> 0.4.In mining,similar 'stress/strength' ratios are used to suggest depth of break-out.The reality behind the fracture initiation stress/strength ratio of '0.4' is actually because of combinations of familiar tensile and compressive strength ratios(such as 10) with Poisson's ratio(say0.25).We exceed the extensional strain limits and start to see acoustic emission(AE) when tangential stress σθ ≈ 0.4σc,due to simple arithmetic.The combination of 2D theoretical FRACOD models and actual tunnelling suggests frequent initiation of failure by 'stable' extensional strain fracturing,but propagation in 'unstable' and therefore dynamic shearing.In the case of very deep tunnels(and 3D physical simulations),compressive stresses may be too high for extensional strain fracturing,and shearing will dominate,both ahead of the face and following the face.When shallower,the concept of 'extensional strain initiation but propagation' in shear is suggested.The various failure modes are richly illustrated,and the inability of conventional continuum modelling is emphasized,unless cohesion weakening and friction mobilization at different strain levels are used to reach a pseudo state of yield,but still considering a continuum.

Evolutionary adaptations of human cancer for parasitic life

According to the xenogamous paradigm of cancer origin, pathogenesis and epidemic spread, human cancer is a disease caused by the appearance in the afflicted body of deviant multicellular structures whose cells are aggressive (gobble the afflicted body;grow and divide without respect to normal limits), invasive (invade and destroy adjacent tissues), metastatic (dispersed over embryogenesis at different locations in the body) and transmissible. The causative agent of the human disease has only just been identified as an ancient, unprecedentedly unique parasitic being that sustains itself at the expense of substances and energy derived from its victim’s body. Presented integrative discovery consists of a more systematic description of main adaptations of cancer causative agent to this specific way of life developed over its evolution. Focus is on the main stages of cancer existence including cancerous invasion of a human body, make-up of the parasite, its self-protection from the victim’s immune defense and regulatory management, disposition of cancer sub-units around afflicted body, the self-management of cancer and its nutrition, communication between dispersed cancer units, physiological synchronization between them, horizontal (reproductive) way of cancer transmission between humans.

New Blood Propels Change New make-up of the UN Security Council will influence reform

A new UN Security Council has been unveiled to the world as India,South Africa,Germany,Portugal and Colombia won two-year non-permanent seat on the council.

Black Hair is Beautiful An On-the-spot Report of 1994 XVⅢ Asian Hairstyling & Make-up Competition

From June 7-10 hair and beauty specialists from 20 countries in Asia gathered in Beijing to take part in the 1994 ⅩⅧ Asian Hairstyling and Make-up Competition. This was the first time the event was held in China. At the same time an international cosmetic, hair and skin care products oriental beauty exposition also was taking place. Throughout history men and women have paid attention to physical beauty, both in the West and the East,

Further investigations on the influence of scale-up of a high shear granulator on the granule properties

This study focuses on the characterisation of strength, density, and size of granules produced in various scales of a high shear granulator. Calcium carbonate （Durca165） was used as the feed powder and aqueous polyethylene glycol （PEG 4000） as the binder. The dried granules were analysed for their strength, density, size distribution, and wall make-up. Granules were produced in granulators with four scales, 1, 5, 50, and 250 L under three scale-up rules of constant tip speed, constant shear stress, and constant Froude number. The results show that regardless of equipment scale, increasing the impeller speed has a great effect on crushing strength and stress. The underlying cause is an increase in granule density due to more consolidation at higher impeller speeds. Wall make-up is significantly reduced to less than 5% as the scale is increased from 1 to 250 L. The results of this study corroborate our previous findings that the constant tip speed rule is the best criterion for scale-up of high shear granulators.