With its rugged limestone hills and upland farmland, divided by ancient stone walls, the Parque Natural das Serras de Aire e Candeeiros national park in Portugal is a major tourist attraction. It is also the center of operations for a number of large limestone quarries.
Previously, many were using Atlas Copco BBD 94 DSI pneumatic rock drills. Now, to satisfy local concerns about noise levels, Atlas Copco is supplying the quarries with BBC 34 DSI models. These offer the same high performance but with a 5 dB(A) lower noise level.
In the early days the limestone quarries in the area worked with Atlas Copco handheld rock drills. In time, as production demands increased and more mechanization was needed, the introduction of the drilling column led to widespread use of Atlas Copco BBD 94 DSI pneumatic rock drill.
Strong environmental pressure
Some of the quarries in the national park are situated close to urban areas and quarry owners were concerned that complaints from residents about drilling noise levels could threaten their exploration permits. Environmental pressure in the area is strong - out of an initial 120 exploration permits issued, there are now only about 40 quarries in operation.
Always quick to respond to customers' issues, Atlas Copco initiated a partnership with local distributor DRCP-Ferramentas e Equipamentos Lda., who conducted field tests using the BBC 34 DSI as an alternative to the BBD 94 DSI machines.
Noise level 50% lower
"The field tests showed that the BBC 34 DSI provides the same high penetration rate as the BBD 94 DSI, but with a noise reduction of 5 dB(A), and this is experienced by the human ear as a 50% lower noise level," explains Torres Marques, Business Line Manager, Atlas Copco Portugal.
The BBC 34 DSI pneumatic rock drill has a piston diameter of 80 mm, a long stroke of 70 mm, and a powerful rifle bar rotation mechanism. It delivers very high impact energy per blow and is highly efficient in medium to hard rock. The large piston diameter enables it to maintain high efficiency even at low air pressure, and maintenance intervals are longer than for the BBD 94 DSI.
Noise issues resolved
"We are now recommending the BBC 34 DSI to the limestone quarries and have approximately 20 units operating in this area," says Marques. "Our customers no longer have concerns regarding noise levels disturbing the local residents."
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Mind, he declares, is an attribute everywhere accompanying matter, co-extensive and co-infinite with space. Our own animation is the sum or the resultant of an animation clinging to every particle that enters into the composition of our bodies. When our thoughts are affected by an external impulse, to suppose that this impulse proceeds from anything material is a delusion; it is produced by the mind belonging to the body which acts on our body; although in what sense this process is to be understood remains a mystery. Spinoza has clearly explained the doctrine of animal automatism, and shown it to be perfectly conceivable;569 but he has entirely omitted to explain how the parallel influence of one thought (or feeling) on another is to be understood; for although this too is spoken of as a causal relation, it seems to be quite different from the logical concatenation described as the infinite intellect of God; and to suppose that idea follows from idea like movement from movement would amount to a complete materialisation of mind; while our philosopher would certainly have repudiated Mr. Shadworth Hodgson’s theory, that states of consciousness are only connected through their extended substratum, as the segments of a mosaic picture are held together by the underlying surface of masonry. Nor can we admit that Spinoza entertained the theory, now so popular, according to which extension and consciousness are merely different aspects of a single reality. For this would imply that the substance which they manifest had an existence of its own apart from its attributes; whereas Spinoza makes it consist of the attributes, that is to say, identifies it with their totality. We are forced, then, to conclude that the proposition declaring thought and extension to be the same thing570 has no413 other meaning than that they are connected by the double analogy which we have endeavoured to explain. “Oh, he’s welcome to it,” Sandy cried. “I’ve turned over a new leaf!” “But—are they?” He pulled a wire out a trifle from the sheath. The sergeant spent more time upon the oaths with which he embellished the counter-question as to how he should know anything about it, than would have been consumed in a civil explanation. "Doctor, he can't die. He mustn't die," said Shorty in agony. "The regiment can't spare him. He's the best soldier in it, and he's my pardner." AND ENTERS UPON HIS PARENTAL RELATIONS TO LITTLE PETE SKIDMORE. "Holy smoke, look there," gasped Monty Scruggs, as a company of rebel cavalry came tearing over the hill in front, to the assistance of their comrades. "That's about it," answered Shorty disdainfully. "That's the way with all cavalry, dad-burn 'em. They're like a passel o' fice pups. They're all yelp and bark, and howl and showin' o' teeth. They're jest goin' to tear you to pieces. But when you pick up a stone or a club, or git ready to give 'em a good kick they're gone, the devil knows where. They're only an aggravation. You never kin do nothin' with 'em, and they kin do nothin' with you. I never kin understand why God Almighty wasted his time in makin' cavalry of any kind, Yank or rebel. All our own cavalry's good for is to steal whisky and chickens from honest soldiers of the infantry. The infantry's the only thing. It's like the big dog that comes up without any special remarks, and sets his teeth in the other dog. 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