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Article
Open AccessMetagenomic insights into microbial community structure and metabolism in alpine permafrost on the Tibetan Plateau
Permafrost, characterized by its frozen soil, serves as a unique habitat for diverse microorganisms. Understanding these microbial communities is crucial for predicting the response of permafrost ecosystems to...
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Article
Open AccessEnhanced response of soil respiration to experimental warming upon thermokarst formation
As global temperatures continue to rise, a key uncertainty of terrestrial carbon (C)–climate feedback is the rate of C loss upon abrupt permafrost thaw. This type of thawing—termed thermokarst—may in turn acce...
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Article
Review on high efficiency and high precision compliant polishing method
Complex precision components are integral to many sectors, straddling both military and civilian applications. These include aerospace telescopes, infrared thermal imaging systems, artificial intelligence, sem...
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Article
Electrochemical magnetorheological finishing for hard-to-machine functional materials with nanometer-scaled surface roughness
WC-Co cemented carbide (WC-Co) is widely used in micro/nano-manufacturing owing to its excellent chemical stability, high-temperature resistance, and stiffness. Yet, its significant hardness and wear resistanc...
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Article
The constant force control based on an optimized environmental model for the robotic lap** of curved surface
During the curved surface lap** processing by robot, the surface quality of the processed workpieces cannot be fully guaranteed because of the uncontrollability of lap** contact force. Therefore, the accur...
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Article
Effect of dispersion performance of polishing slurry on the polishing quality of glass-ceramics in bonnet polishing
As a material with both glass and ceramic properties, glass-ceramics have been widely used because of its low expansion coefficient, stable physical and chemical properties, and good mechanical properties. In ...
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Article
Open AccessCharacteristics of methane emissions from alpine thermokarst lakes on the Tibetan Plateau
Understanding methane (CH4) emission from thermokarst lakes is crucial for predicting the impacts of abrupt thaw on the permafrost carbon-climate feedback. However, observational evidence, especially from high-al...
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Article
Experimental study on the reliability and the precision maintenance of the ultra-precision grinding machine based on the key subsystem platforms
The development of high-reliability, high-precision large-scale CNC ultra-precision grinding machines is essential for the efficient processing and manufacturing of large-diameter optical components. In this p...
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Article
Open AccessDivergent changes in particulate and mineral-associated organic carbon upon permafrost thaw
Permafrost thaw can stimulate microbial decomposition and induce soil carbon (C) loss, potentially triggering a positive C-climate feedback. However, earlier observations have concentrated on bulk soil C dynam...
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Article
Review on ultra-precision bonnet polishing technology
With the development of science and technology, in the fields of national defense, aerospace, medical treatment, automobile, and so on, the demands for ultra-precision parts and molds with complex surfaces suc...
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Article
Terrestrial carbon sinks in China and around the world and their contribution to carbon neutrality
Enhancing the terrestrial ecosystem carbon sink (referred to as terrestrial C sink) is an important way to slow down the continuous increase in atmospheric carbon dioxide (CO2) concentration and to achieve carbon...
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Article
Review on polishing technology of small-scale aspheric optics
Small-scale aspheric optical elements have an urgent market demand and a wide range of applications. With the development of science and technology and the increasing requirements on product quality, the polis...
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Article
Open AccessProgressive nitrogen limitation across the Tibetan alpine permafrost region
The ecosystem carbon (C) balance in permafrost regions, which has a global significance in understanding the terrestrial C-climate feedback, is significantly regulated by nitrogen (N) dynamics. However, our kn...
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Article
Prediction of subsurface damage depth in rotary ultrasonic machining of glass BK7 with probability statistics
Subsurface damage (SSD) generated in rotary ultrasonic machining (RUM) process significantly deteriorates the technological and structural performance of the optical components. However, the invisibility of su...
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Article
Influence of relative difference between paired guide rails on motion accuracy in closed hydrostatic guideways
There have been many researches concerning the motion errors of hydrostatic guideways because they directly affect the accuracy of machined parts. Actually, each paired guide rail has its own profile feature, ...
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Reference Work Entry In depth
Grinding and Dressing Tools for Precision Machines
Grinding is a typical machining process which utilizes a grinding wheel consisting of abrasive grains held together with a binder material. The material removal action is done by the masses of tiny and sharp a...
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Living Reference Work Entry In depth
Grinding and Dressing Tools for Precision Machines
Grinding is a typical machining process which utilizes a grinding wheel consisting of abrasive grains held together with a binder material. The material removal action is done by the masses of tiny and sharp a...
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Article
Effects of nitrogen-phosphorus imbalance on plant biomass production: a global perspective
Unparalleled inputs of anthropogenic nitrogen (N) and phosphorus (P) cause a strong N-P imbalance in terrestrial ecosystems. However, the effects of N-P imbalance on plant biomass production remains unclear.
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Chapter and Conference Paper
Ultra-broad Bandpass Filter Based on Composite Right-Left Handed Transmission Line Model
An equivalent circuit model based on composite right-left handed transmission line is investigated in this paper. The dispersion relation of the equivalent circuit model is derived and a zero order resonator i...
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Chapter and Conference Paper
Relay Location Optimization and Relay Coordination in Multi-hop Cognitive Radio Networks
Relay cooperative transmission can increase the transmission distance and reduce the transmit power. In this paper, three transmission modes are discussed: direct mode, single relay mode and dual relay mode
