scholarly journals The initial run-in and long-term drift of the adhesive force between polycrystalline silicon MEMS sidewalls

2021 ◽  
Author(s):  
Jaap Kokorian ◽  
W. Merlijn van Spengen
Keyword(s):  
Polycrystalline Silicon ◽  
Adhesion Force ◽  
Adhesive Force ◽  
Adhesion Forces ◽  
Useful Knowledge ◽  
Optical Displacement ◽  
Short Run ◽  
Force Resolution ◽  
Region Ii

AbstractIn this paper we measure the evolution of adhesion between two polycrystalline silicon sidewalls of a microelectromechanical adhesion sensor during three million contact cycles. We execute a series of AFM-like contact force measurements with comparable force resolution, but using real MEMS multi-asperity sidewall contacts mimicking conditions in real devices. Adhesion forces are measured with a very high sub-nanonewton resolution using a recently developed optical displacement measurement method. Measurements are performed under well-defined, but different, low relative humidity conditions. We found three regimes in the evolution of the adhesion force. (I) Initial run-in with a large of cycle-to-cycle variability, (II) Stability with low variability, and (III) device-dependent long term drift. The results obtained demonstrate that although a short run-in measurement shows stabilization, this is no guarantee for long-term stable behavior. Devices performing similarly in region II, can drift very differently afterwards. The adhesion force drift during millions of cycles is comparable in magnitude to the adhesion force drift during initial run-in. The boundaries of the drifting adhesion forces are reasonably well described by an empirical model based on random walk statistics. This is useful knowledge when designing polycrystalline silicon MEMS with contacting surfaces.

scholarly journals The adhesion model considering capillarity for gecko attachment system

2007 ◽  
Vol 5 (20) ◽  
pp. 319-327 ◽  
Author(s):  
Tae Wan Kim ◽  
Bharat Bhushan
Keyword(s):  
Capillary Force ◽  
Adhesion Force ◽  
Adhesive Force ◽  
Contact Angles ◽  
Adhesion Forces ◽  
Real Area Of Contact ◽  
Wide Range ◽  
Elliptical Integral ◽  
Gecko Adhesion ◽  
Surface Construction

Geckos make use of approximately a million microscale hairs (setae) that branch off into hundreds of nanoscale spatulae to cling to different smooth and rough surfaces and detach at will. This hierarchical surface construction gives the gecko the adaptability to create a large real area of contact with surfaces. It is known that van der Waals force is the primary mechanism used to adhere to surfaces, and capillary force is a secondary effect that can further increase adhesive force. To investigate the effects of capillarity on gecko adhesion, we considered the capillary force as well as the solid-to-solid interaction. The capillary force expressed in terms of elliptical integral is calculated by numerical method to cope with surfaces with a wide range of contact angles. The adhesion forces exerted by a single gecko spatula in contact with planes with different contact angles for various relative humidities are calculated, and the contributions of capillary force to total adhesion force are evaluated. The simulation results are compared with experimental data. Finally, using the three-level hierarchical model recently developed to simulate a gecko seta contacting with random rough surface, the effect of the relative humidity and the hydrophobicity of surface on the gecko adhesion is investigated.

Determinants of Inflation in Vietnam: A VECM Approach

2015 ◽  
Vol 22 (04) ◽  
pp. 26-50
Author(s):  
Ngoc Tran Thi Bich ◽  
Huong Pham Hoang Cam
Keyword(s):  
Interest Rate ◽  
Crude Oil ◽  
Error Correction ◽  
Budget Deficit ◽  
Oil Prices ◽  
Crude Oil Prices ◽  
Domestic Credit ◽  
Short Run ◽  
The Impact

This paper aims to examine the main determinants of inflation in Vietnam during the period from 2002Q1 to 2013Q2. The cointegration theory and the Vector Error Correction Model (VECM) approach are used to examine the impact of domestic credit, interest rate, budget deficit, and crude oil prices on inflation in both long and short terms. The results show that while there are long-term relations among inflation and the others, such factors as oil prices, domestic credit, and interest rate, in the short run, have no impact on fluctuations of inflation. Particularly, the budget deficit itself actually has a short-run impact, but its level is fundamentally weak. The cause of the current inflation is mainly due to public's expectations of the inflation in the last period. Although the error correction, from the long-run relationship, has affected inflation in the short run, the coefficient is small and insignificant. In other words, it means that the speed of the adjustment is very low or near zero. This also implies that once the relationship among inflation, domestic credit, interest rate, budget deficit, and crude oil prices deviate from the long-term trend, it will take the economy a lot of time to return to the equilibrium state.

scholarly journals Short-Run Needs and Long-Term Goals: A Dynamic Model of Thirst Management

2015 ◽  
Vol 34 (5) ◽  
pp. 702-721 ◽  
Author(s):  
Guofang Huang ◽  
Ahmed Khwaja ◽  
K. Sudhir
Keyword(s):  
Dynamic Model ◽  
Short Run

Where Did All the Dollars Go? The Effect of Cash Flows on Capital and Asset Structure

2011 ◽  
Vol 46 (5) ◽  
pp. 1259-1294 ◽  
Author(s):  
Sudipto Dasgupta ◽  
Thomas H. Noe ◽  
Zhen Wang
Keyword(s):  
Cash Flow ◽  
Economic Effect ◽  
Balance Sheet ◽  
Cash Flows ◽  
Long Run ◽  
Goods Market ◽  
Short Run ◽  
Debt Market ◽  
Short And Long Term

AbstractThis paper documents the short- and long-term balance sheet effect of cash flows. We show that cash savings in the short run and debt reduction in both the short and the long run account for a substantial fraction of cash flow use. Although, in the long run, investment exhibits substantial sensitivity to cash flows, investment does not absorb the entire cash flow shock. In fact, the tighter the financial constraints, the smaller the fraction of cash flow absorbed by investment and the more by leverage reduction. Firms stage their response to increases in cash flow, delaying investment while building up cash stocks and reducing leverage. These results suggest that much of the short-run economic effect of cash flow shocks to the corporate sector may be channeled into the corporate debt market rather than the capital goods market, especially when financing constraints tighten.

The Real Effects of Military Spending on Security

2014 ◽  
Vol 20 (3) ◽  
pp. 377-393 ◽  
Author(s):  
Lloyd J. Dumas
Keyword(s):  
Military Spending ◽  
Well Being ◽  
Military Force ◽  
Physical Security ◽  
Dead Weight ◽  
Economic Relationships ◽  
Real Effects ◽  
Long Run ◽  
Short Run

AbstractThe indirect effects of military spending on security are stronger and more important than its direct effects, and its long run impact more telling than its short run impact. In the short run, military spending can be a source of both physical security and economic stimulus. In the long run, it can be counterproductive in terms of physical security and will be a dead weight on the economy. How a society’s productive resources are deployed, as between military spending and more economically productive activities, sets it on a long-term course with powerful implications for the ability of its economy to do what it is supposed to do – provide for the material well-being of the population as a whole. The mechanism by which the extensive and extended diversion of productive economic resources to economically unproductive military spending drags an economy down is analyzed. Furthermore, it is possible to use properly structured international and domestic economic relationships in place of threats or use of military force to increase national and international security, while at the same time enhancing, rather than degrading, economic wellbeing. Three principles for structuring such a “peacekeeping economy” are set forth.

Does Public Debt Service Expenditure Crowd-Out Economic Growth? Empirical Evidence from an African Developing Country

2019 ◽  
Vol 64 (3) ◽  
pp. 23-38
Author(s):  
Talknice Saungweme ◽  
Nicholas M. Odhiambo
Keyword(s):  
Economic Growth ◽  
Public Debt ◽  
Time Series Data ◽  
Policy Formulation ◽  
Debt Service ◽  
Series Data ◽  
Long Run ◽  
Short Run ◽  
The Impact

Abstract This paper contributes to the ongoing debate on the impact of public debt service on economic growth; and it provides an evidence-based approach to public policy formulation in Zimbabwe. The empirical analysis was performed by applying the autoregressive distributed lag (ARDL) technique to annual time-series data from 1970 to 2017. The study findings reveal that the impact of public debt service on economic growth in Zimbabwe is negative in the short run but positive in the long run. The results are suggestive of the existence of a crowding-out effect of public debt service in Zimbabwe in the short run and a crowding-in effect in the long run. In view of these findings, the government should consider fiscal and financial policies that promote a constant supply of long-term finance, long-term fixed investments, and extension of a government securities maturity structure so as to ensure sustainable short- and long-term public debt service expenditures. The study further recommends the strengthening of non-distortionary revenue mobilisation reforms to reduce market distortions and boost domestic investment.

scholarly journals Carbohydrate–carbohydrate interaction provides adhesion force and specificity for cellular recognition

2004 ◽  
Vol 165 (4) ◽  
pp. 529-537 ◽  
Author(s):  
Iwona Bucior ◽  
Simon Scheuring ◽  
Andreas Engel ◽  
Max M. Burger
Keyword(s):  
Adhesion Force ◽  
Species Specificity ◽  
Live Cells ◽  
Sponge Cell ◽  
Cell Recognition ◽  
Adhesion Forces ◽  
Cellular Recognition ◽  
Strong Adhesion ◽  
Species Specific ◽  
Cell Cell

The adhesion force and specificity in the first experimental evidence for cell–cell recognition in the animal kingdom were assigned to marine sponge cell surface proteoglycans. However, the question whether the specificity resided in a protein or carbohydrate moiety could not yet be resolved. Here, the strength and species specificity of cell–cell recognition could be assigned to a direct carbohydrate–carbohydrate interaction. Atomic force microscopy measurements revealed equally strong adhesion forces between glycan molecules (190–310 piconewtons) as between proteins in antibody–antigen interactions (244 piconewtons). Quantitative measurements of adhesion forces between glycans from identical species versus glycans from different species confirmed the species specificity of the interaction. Glycan-coated beads aggregated according to their species of origin, i.e., the same way as live sponge cells did. Live cells also demonstrated species selective binding to glycans coated on surfaces. These findings confirm for the first time the existence of relatively strong and species-specific recognition between surface glycans, a process that may have significant implications in cellular recognition.

scholarly journals Liquidity-Adjusted Benchmark Yield Curves: A Look at Trading Concentration and Information

2007 ◽  
Vol 10 (04) ◽  
pp. 491-518 ◽  
Author(s):  
William T. Lin ◽  
David S. Sun
Keyword(s):  
Term Structure ◽  
Yield Curve ◽  
Information Discovery ◽  
Affine Term Structure ◽  
Term Structure Model ◽  
Long Run ◽  
Fitting Method ◽  
Bond Issues ◽  
Short Run

Estimation of benchmark yield curve in developing markets is often influenced by liquidity concentration. Based on an affine term structure model, we develop a long run liquidity weighted fitting method to address the trading concentration phenomenon arising from horizon-induced clientele equilibrium as well as information discovery. Specifically, we employ arguments from models of liquidity concentration and benchmark security information. After examining time series behavior of price errors against our fitted model, we find results consistent with both the horizon and information hypotheses. Our evidence indicates that trading liquidity carries information effect in the long run, which cannot be fully captured in the short run. Trading liquidity plays a key role in long run term structure fitting. Markets for liquid benchmark government bond issues collectively form a long term equilibrium. Compared with previous studies, our results provide a robust and realistic characterization of the spot rate term structure and related price forecasting over time, which in turn help portfolio investment of fixed income and long run pricing of financial instruments.

scholarly journals MENEJMEN RISIKO DALAM PERFEKTIF ISLAM

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
Supriyo Supriyo
Keyword(s):  
Risk Management ◽  
Production System ◽  
Human Life ◽  
Short Term ◽  
Islamic Perspective ◽  
The Family ◽  
The Future ◽  
Short Run ◽  
A Company

Human life with all its activities in order to meet the needs of life always will always faced the possibility of risk either directly or indirectly, can occur in the short term or long term. A possibility of the occurrence or risk had certainly will affect the activity to be done And adversely affect the economy of a family and even a company, if the risks that occur have a vital impact on the family or an organization. Many failures within a company's organization are due to unforeseen risks occurring as for example the company never thinks that a newly established company is still in the short run abruptly because a workforce lacking control in the production system creates a great fire and spends all and has a bad impact For the economy of a family and even a company, if the risks that occur have a vital impact on the family or an organization. Many failures within a company's organization are due to unforeseen risks occurring as for example the company never thinks that a newly established company is still in the short run abruptly because a workforce lacking control in the production system creates a terrible fire and consumes all the company's assets Newly established. Everyone or anyone else would not want the incident to happen and befall themselves and his business in the future. Keywords: Islamic perspective, Risk management

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