The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Due to carriers Band-To-Band-Tunneling (BTBT) through channel-source/drain contacts, Conventional MOS-like Carbon Nanotube Field Effect Transistors (C-CNFETs) suffer from ambipolar conductance, which deteriorates the device performance greatly. In order to reduce such ambipolar behavior, a novel device design based on dual gate material is proposed. The simulation results show that, with proper choice...
The water supply pipe network security issue is the safety of drinking water problem of urban residents faced the basic problem, in order to quantitatively study the safety of urban water supply pipe network level. Using the improved AHP built determination matrix and determined the weight of each index, using multi-level fuzzy assessment method to evaluate the water supply pipe network security level...
Wind erosion is an important environmental problem, thus researchers have used many methods to study it. The methods that have been used mainly involved theoretical analysis, experimental measurements under artificial conditions (e.g., in wind tunnels), and numerical simulations using a range of models. However, the results of these studies differ, and are not always satisfactory, particularly in...
In this paper we present the relative work function measurements of Platinum (Pt), Molybdenum (Mo), Lead (Pb), and Graphite (C) by using Kelvin Probe. The obtained results have shown that the work function measurements made in air are affected by the adsorption of oxygen. To measure the “true” metal work function the oxide layer has to be removed. Moreover in the experiments...
Power Quad Flat No-lead (PQFN) packages are extensively used in automotive applications. Features such as solder die attach material, thick copper lead frame, exposed heat sink and heavy gauge aluminum wire, are adopted to ensure good thermal management and reliability performance. Solder voids, cavities formed between power die and lead frame during solder reflowing process, are major defects in...
To attempt to understand the differences between rice genotypes in lead (Pb) tolerance, pot soil experiments were conducted with two rice genotypes at different soil Pb levels, i.e. 0 (the control), 800, 2000 mg kg-1. The results showed that the soil Pb concentration of 800 mg kg-1 is moderately toxic to rice, with 10%-30% decreases in plant biomasses. The soil Pb concentration of 2000 mg kg-1 is...
The modification of sodium trititanate whisker surface was performed by means of impregnation procedure to fabricate the modified sodium trititanate whisker, which was characterized by scanning electron microscopy(SEM) and infrared spectroscopy(IR). Its adsorptive performance for Co(II), Pb(II) in a static system was investigated by inductively coupled plasma atomic emission spectrometry(ICP-AES)...
An outstanding development in modern education is the increased use of supplementary devices by which the teacher through the use of more than one sensory channel helps to clarify, establish and correlate accuracy, concepts, interpretations and appreciations; increase knowledge, arouses interest and even evokes worthy emotions and enriches the imagination of children. The investigator made an attempt...
A new adsorbent was developed from municipal sewage sludge (SS) combined with 5-20% pyrolusite of the weight of SS carbon, and using ZnCl2 as chemical activation reagent. Characterized by N2-BET methods and SEM, the result showed that the surface area of the new adsorbent was increased to 354.198 m2/g compared with that of the unmi- xed sludge activated carbon 232.526 m2/g and total pore and micropore...
The combined steel lead damper (CSLD) is made up of steel and lead material skillfully. It is a high performance damper with merits of simple production process and economy. Based on the test study of I-section CSLD, take into account the nonlinear constitutive relationship of materials and the contact action between the two materials, finite element models were proposed to simulate the damper. The...
Tobermorite is a mineral material with good ion exchange properties. The potassium feldspar ore from Lushi country is muscovite syenite. Potassium feldspar was hydrothermally decomposed with CaO as an additive, and then tobermorite nano-scale powder was synthesized. Based on the research work of our group, the adsorption property of tobermorite to Pb2+ from aqueous solution was studied. The factors...
Lead-free solders have strain rate dependent mechanical properties. In this work we report the elastic modulus and yield strength of several lead-free solder alloys at different strain rates. They are SnAgCu (with Ag 1 to 4% and Cu at 0.5%, namely SAC105, SAC205, SAC305 and SAC405), SAC-X (X=In, Ni and Bi), SnCu, SnCu-X and SnAg alloys. The intermediate strain rate tests (10-3-101 1/sec) were conducted...
Sn-Ag-Cu (SAC) solder alloys, such as Sn-3.0Ag-0.5 Cu (SAC305) are the popular choices of lead-free solders replacing SnPb solders. However, SAC solders are more brittle in nature due to high stiffness and excessive intermetallic compounds growth at the solder joint to pad interface. This leads to higher risks in solder joints failures. Memory module type lead-free BGA packages are constantly under...
This study focuses on the relationship between material resources and innovation project performance. The literature predominantly attests material resources to have a wholesale positive effect on innovation. However, empirical studies on this topic yielded contradictory results. We propose that the ambiguity observed in the material resources - innovation project performance relationship results...
End of 2009 EURAMET, the European metrology organization opened a call to advance measurement science and technology in the field of Energy by providing funding for Joint Research Projects to be funded jointly by the European Commission and the participating countries as a part of the European Treaty. This paper describes a planned project; no technical results will be available at the time of the...
The current international economic operating environment demands the enterprise to enhance its competitiveness continually, so how to enhance the competitiveness has become the focus of Chinese enterprises. Human being is the most valuable resource, and only by providing a wide range of training opportunities can these limited resources release the largest energy. This article is to design customized...
The key project improvement management, as the main tool approach for continuous improvement of enterprises' system variability, helps the enterprise enhance performance management and guarantees the company's products to obtain sustainable competitive advantage. Through the analysis on the problems in the key project improvement management implemented by private enterprises, this paper advances some...
Sustainability is one of the global grand challenges of the 21st century. In order for future generations to enjoy a satisfactory quality of life, the current generation must find ways to meet humanity's needs for energy, shelter, food and water in ways that are environmentally, economically, and socially sustainable. Engineers must be trained to design systems and technologies that have a small environmental...
Bilingual instruction, an educational experiment and reform, integrates language teaching and learning with subject teaching and learning, aiming to improve both language proficiency and academic achievement. This paper tries to explore bilingual instruction orientation as well as feasible instruction models and strategies. Attention is also paid to the problems arising in bilingual instruction. As...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.