Overview of the Control Methods for LTCC Substrate Shrinkage

2014 ◽  
Vol 989-994 ◽  
pp. 2895-2898
Author(s):  
Xiao Dong Liu ◽  
Shao Hong Wang ◽  
Zhao Xia Hou ◽  
Dan Zhou ◽  
Li Qiong Yang
Keyword(s):  
Low Temperature ◽  
High Speed ◽  
High Reliability ◽  
Development Trend ◽  
Control Methods ◽  
Close Attention ◽  
Practical Effect ◽  
Sintering Shrinkage ◽  
The Development Trend ◽  
Ltcc Substrate

As a new integration and packing technology, the low temperature co-fired ceramic (LTCC) technology attracts close attention for its excellent advantages such as high speed transfer characteristics, high reliability, miniaturization, etc. However, the sintering shrinkage of LTCC substrate always affects the practical effect of it. In this paper, the material characteristics, methods to control the sintering shrinkage of LTCC substrate and the development trend for the control methods are mainly overviewed. It is contributed to the research and application of LTCC technology.

scholarly journals Research on Performance Test System of Space Harmonic Reducer in High Vacuum and Low Temperature Environment

Machines ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Jing Wang ◽  
Zhihua Wan ◽  
Zhurong Dong ◽  
Zhengguo Li
Keyword(s):  
Low Temperature ◽  
High Speed ◽  
Performance Test ◽  
High Reliability ◽  
High Vacuum ◽  
Test System ◽  
Low Noise ◽  
Speed Ratio ◽  
Space Harmonic ◽  
Temperature Environment

The harmonic reducer, with its advantages of high precision, low noise, light weight, and high speed ratio, has been widely used in aerospace solar wing deployment mechanisms, antenna pointing mechanisms, robot joints, and other precision transmission fields. Accurately predicting the performance of the harmonic reducer under various application conditions is of great significance to the high reliability and long life of the harmonic reducer. In this paper, a set of automatic harmonic reducer performance test systems is designed. By using the CANOpen bus interface to control the servo motor as the drive motor, through accurately controlling the motor speed and rotation angle, collecting the angle, torque, and current in real time, the life cycle test of space harmonic reducer was carried out in high vacuum and low temperature environment on the ground. Then, the collected data were automatically analyzed and calculated. The test data of the transmission accuracy, backlash, and transmission efficiency of the space harmonic reducer were obtained. It is proven by experiments that the performance data of the harmonic reducer in space work can be more accurately obtained by using the test system mentioned in this paper, which is convenient for further research on related lubricating materials.

Characterization of Low Temperature Polysilicon TFTs with Self-Aligned Graded LDD Structure

2001 ◽  
Vol 685 ◽  
Author(s):  
Ching-Wei Lin ◽  
Li-Jing Cheng ◽  
Yin-Lung Lu ◽  
Huang-Chung Cheng
Keyword(s):  
Low Temperature ◽  
Leakage Current ◽  
High Speed ◽  
High Reliability ◽  
Activation Process ◽  
Active Matrix ◽  
Dopant Activation ◽  
Low Leakage ◽  
Low Leakage Current ◽  
Excimer Laser Irradiation

AbstractA simple process sequence for fabrication of low temperature polysilicon (LTPS) TFTs with self-aligned graded LDD structure was demonstrated. The graded LDD structure was self-aligned by side-etch of Al under the photo-resist followed by excimer laser irradiation for dopant activation and laterally diffusion. The graded LDD polysilicon TFTs were suitable for high-speed operation and active matrix switches applications because they possessed low-leakage-current characteristic without sacrificing driving capability significantly and increasing overlap capacitance. The leakage current of graded LDD polysilicon TFTs at Vd = 5V and Vg = −10V could attain to below 1pA/μm without any hygrogenation process, when proper LDD length and laser activation process were applied. The on/off current ratios of these devices were also above 108. Furthermore, due to graded dopant distribution in LDD regions, the drain electric field could be reduced further, and as a result, graded LDD polysilicon TFTs provided high reliability for high voltage operation.

The Measurement of Water Bursting Volume of Jianfeng Mountain Tunnel and Treatment Techniques of Water Bursting

2012 ◽  
Vol 204-208 ◽  
pp. 1335-1342
Author(s):  
Jun Huang ◽  
Guo Ming Li ◽  
Bing Wang ◽  
Hong Zhou Liu ◽  
Rui Gang Song
Keyword(s):  
High Speed ◽  
Development Trend ◽  
Water Inflow ◽  
Treatment Techniques ◽  
Design Changes ◽  
Chongqing City ◽  
Survey Results ◽  
Large Water ◽  
Water Bursting ◽  
The Development Trend

The measurement of tunnel water inflow is not only an important basis for engineering design changes, but also an effective verification of design. This paper combines with the analysis of the measured data of groundwater of large water inflow section, which appeared in the construction of high-speed Jianfeng mountain super long tunnel in Fuling Fengdu, Chongqing city, and detailed information of hydrological survey results. This paper has re-evaluated the engineering geology and hydro-geological of large gushing sections to clear the reason of water inflow, the development trend characteristics of groundwater and stability of surrounding rock. It is shown in this paper that the measures such as strengthening the support parameters, optimizing the waterproof and drainaging design schemes, and other measures can be adopted to ensure the safety of tunnel construction and effectively realize the concept of dynamic construction.

The Accuracy Analysis on the External Circular of Zirconia Ceramic Spindle by Precision Machining

2011 ◽  
Vol 383-390 ◽  
pp. 3361-3365
Author(s):  
Feng Lu ◽  
Shi Chao Chen ◽  
Ke Zhang ◽  
Yu Hou Wu
Keyword(s):  
Machine Tool ◽  
High Speed ◽  
Production Efficiency ◽  
High Reliability ◽  
Dynamic Balance ◽  
Development Trend ◽  
Zirconia Ceramic ◽  
Design Standards ◽  
Accuracy Requirement ◽  
Nc Machine

The high-speed ceramic electric spindle is applied in high-speed NC machine tools. Now the technology of ceramic spindle with its excellent performance applied to electric spindle is becoming a kind of important development trend. Each surface processing accuracy requirement of high-speed ceramic electric spindle is high. The performance of the electric spindle in largely determines machining precision and production efficiency of the high-speed machine tool. In order to meet the requirements of high speed, high accuracy, high reliability and small vibration in the rapid processing of machine tool, it is necessary to make a rigorous precision testing for the precision-processed spindle and obtain reliable data to meet the design standards and performance requirements of all ceramic high-speed spindle. This paper focuses on the research of surface roughness, roundness and cylindricity analysis of spindle external circular, which can make the precision-processed zirconia ceramic spindle pore to meet the design requirements and provide reliability safeguard to promote the using life and high-speed dynamic balance stability of the whole electric spindle.

The Multi-Domain Applications of Internet of Things

2014 ◽  
Vol 687-691 ◽  
pp. 2280-2283
Author(s):  
Yi Fei Zhang ◽  
Yu Huan Ji
Keyword(s):  
Internet Of Things ◽  
High Speed ◽  
Development Trend ◽  
The Internet ◽  
Social Production ◽  
The Future ◽  
The Development Trend ◽  
The Internet Of Things

The development of internet of things in recent years is firstly introduced in this paper, it points out that the internet of things has been used extensively in multi-domain not only because height attention in many countries, but also because of the high-speed development of technology. After that, the emphasis of this paper is to expound and analyze the actual applications of internet of things in several specific areas of social production and life nowadays. Finally, this paper points out the strengths of internet of things development in china, and looks forward to the development trend of internet of things and the life vision in the future.

Introducing DuPont™ GreenTape™ 9K5 Low Dielectric Constant, Low Temperature Co-Fired Ceramic (LTCC) Tape System

2011 ◽  
Vol 2011 (1) ◽  
pp. 000544-000552
Author(s):  
Deepukumar M. Nair ◽  
James Parisi ◽  
K.M. Nair ◽  
Mark McCombs ◽  
Michael Smith ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Low Temperature ◽  
Millimeter Wave ◽  
High Speed ◽  
High Reliability ◽  
Signal Propagation ◽  
Dielectric Constants ◽  
Low Dielectric Constant ◽  
Material System ◽  
Low Dielectric

Low Temperature Co-fired Ceramic (LTCC) material systems have been successfully used in microwave and millimeter wave systems for several years. LTCC has very low dielectric loss, high reliability due to inherent hermeticity; high interconnect density, multilayer processing capability leading to true 3D packaging, and better cost-performance balance. While the medium range dielectric constants (7.00 – 8.00) offered by current tape systems have advantages, it is generally difficult to realize high speed systems and efficient antennas on LTCC, especially at millimeter wave frequencies. The difficulty arises from the reduced signal propagation velocity in high-speed applications, and lower radiation efficiency for antennas, both due to higher dielectric constant. To enable and extend applications of LTCC technology to these subsystems, DuPont has developed a new low dielectric constant LTCC system – DuPont™ GreenTape™ 9K5 - which has a dielectric constant of 5.80 (at 10 GHz) that is compatible with the commercial DuPont™ GreenTape™ 9K7 LTCC System. This is achieved without compromising excellent microwave loss properties of the 9KX GreenTape™ platform. These materials systems enable high-speed, high reliability applications while also realizing efficient antennas on LTCC. This paper presents initial characterization of the new DuPont™ GreenTape™ 9K5 LTCC system consisting of low K dielectric tape, gold and silver conductors to evaluate the effects of chemistry, processing conditions, processing latitude, microstructure, and microwave performance. Test coupons with various transmission and resonating structures are designed, fabricated, and tested for the evaluation of transmission losses and dielectric properties. Stability of the material system over multiple re-fire steps is also examined

Computer Numerical Control Machine Tool and its Development Trend

2013 ◽  
Vol 774-776 ◽  
pp. 1458-1461
Author(s):  
Huan Yun Wang ◽  
Xiu Fen Liu
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Manufacturing Industry ◽  
High Reliability ◽  
Development Trend ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Control Machine Tool ◽  
Comprehensive Level

CNC machine tools are the key equipment in the equipment manufacturing industry, which is related to the national economic construction and strategic position, and is an important symbol reflecting the national comprehensive level. This article analyzes the emergency and characteristics of CNC machine tools and its development trend such as high precision, high speed, high reliability, complex, intelligent, flexibility, integration and openness.

scholarly journals CURRENT STATE OF THE INDUSTRY OF ELECTRIC BRANCH-FREE MOTORS AND METHODS OF THEIR CONTROL

2020 ◽  
Vol 2020 (1) ◽  
pp. 35-37
Author(s):  
Dmitriy Kozlovskiy ◽  
Vladimir Mazur ◽  
Aleksey Pudalov
Keyword(s):  
Motor Control ◽  
Development Trend ◽  
Control Methods ◽  
Brushless Motors ◽  
Motor Industry ◽  
Brushless Motor ◽  
Current State ◽  
The Development Trend

The development trend of the brushless motor industry and their application are described. The advantage of brushless motors in comparison with commutator ones is explained. Brushless motor control methods are described

Development of High Speed Precision Press and its Development Trends

2016 ◽  
Vol 693 ◽  
pp. 89-92
Author(s):  
M.H. Xiao ◽  
L.B. Yu ◽  
G.H. Li ◽  
W.J. Liang
Keyword(s):  
High Speed ◽  
Development Trend ◽  
Development Trends ◽  
Research Status ◽  
The Development Trend ◽  
At Home

High speed press is precision mechanical presses, with automatic feeding device, which has automatic, high-speed, precision three basic elements. This paper first describes the characteristics of the different definitions of high-speed presses and the characteristics of the object suitable for processing parts. Then the research status of high speed precision press at home and abroad was analyzed, and the development trend of high-speed precision presses was investigated.

Performance Test Specification for Passenger Car in Low Temperature

2011 ◽  
Vol 418-420 ◽  
pp. 2272-2277
Author(s):  
Chen Mi ◽  
Da Ming Han
Keyword(s):  
Low Temperature ◽  
Performance Test ◽  
Development Trend ◽  
Passenger Cars ◽  
Passenger Car ◽  
Mechanical Parts ◽  
Fair Competition ◽  
Technical Content ◽  
Test Specification ◽  
The Development Trend

The study of this article focus on the standards on the working limit of the passenger car. The standards for passenger cars at low temperature were studied and proposed by combination of the technical content in cold regions’ environments and the development trend in the domestic and international situation. The proposed standards can improve the service life of mechanical parts, reduce wear and failure of passenger cars and improve the passenger's power, economy and security. In the industry standardization and the objective requirements of relevant standards, this proposed standards are the basis to ensure fair competition in international trade, maintain the normal order of market and make up a communication bridge among the international economic cooperations. Maintain maximum benifit of the China's auto industry in the internationality. The emphases of the standards is to establish standards for low temperature environment laboratory, draw our own standards on product characteristics and screening standards system in line with China's actual conditions.

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