Recent studies have suggested that species-specific pit properties such as pit membrane thickness, pit membrane porosity, torus-to-aperture diameter ratio and pit chamber depth influence xylem vulnerability to cavitation. Despite the indisputable importance of using mean pit characteristics, considerable variability in pit structure within a single species or even within a single pit field shou...

the “ Serpentino della Valmalenco ”, a group of serpentinite varieties, was quarried and used as dimension building stone since XI century, especially in thin slabs for roof covering. The extractive activity initially took place underground, moving to open pit quarries 20th century. It is currently widely appreciated material on international market, commercialized several commercial varieties ...

underground economy affects important indexes such as formal gdp, unemployment, consumption, production and etc. therefore it is necessary to identify elements and factors which affect underground economy to restrict it. surveys and studies indicate the size of iran’s underground economy is high and taxes, quantity and quality of regulations and performance of formal economy are the important f...

The influence of separation distance between pre-induced corrosion pits on both crack initiation and fatigue lifetimes is studied in an air environment by testing specimens containing pit pairs the low-stress, high cycle regime. results these tests are compared with equivalent samples similar sized single pit. Within scope sizes distances investigated, when below a threshold, decreasing leads t...

iran is believed to occupy the second place, following turkey, among the apricot producing countries in the world. iran is faced with problems in export of apricot due to little or non-observance of drying principals and inattention to world market requirements. the physical and mechanical properties of agricultural products are the most needed and important parameters for design and developmen...

Pavlovian conditioned stimuli can influence instrumental responding, an effect called Pavlovian-instrumental transfer (PIT). During the last decade, PIT has been subdivided into two types: specific PIT and general PIT, each having its own neural substrates. Specific PIT happens when a conditioned stimulus (CS) associated with a reward enhances an instrumental response directed to the same rewar...

Abstract This paper adopts the key technology “tunnel and underground space support components”, assembles it into a “honeycomb” structure type, expands its application to deep foundation pit engineering, which fully reflects combination of “industry-university-research” theoretical research engineering practical application. can optimize setting lateral components in process, improve current c...

During the underground mining of coal resources, rock pressure emerges acutely and mine geological disasters occur frequently. It is great significance to grasp manifestation law in time guide safety production operation pit. In this research, calculation equations concept information entropy based on zone degree are primarily defined, synergetic theory maximum principle combined put forward sy...