In your estimation, the pattern of outbreak of the Convid-19 will follow the normal distribution, Weibull distribution, or what distribution?

More Nazaruddin Sinaga's questions See All

Is the sinovac vaccine safe and effective for people over the age of 60 ?

Dear respective researchers, I was asked by my institution to be vaccinated this week using the sinovac vaccine. However, from some of the information I got, this vaccine is not recommended for...

01 March 2021 7,781 6 View

Does the corpse of the Covid-19 virus victim still have the potential to transmit this virus?

If there is still potential, how long can this virus still be infected? Please give your comment. Thank you very much. Best regards.

23 December 2020 1,363 8 View

Which turbulence model is most suitable for numerical calculations of flow and heat transfer in annular finned tubes geometry?

16 December 2019 3,117 13 View

What is the effect of free stream turbulence on the transition from laminar to turbulent?

Is there a universal theory that explains the effect of free turbulence on the flow transition from laminar to turbulent? Please give your opinion here. Thank you very much.

16 December 2019 5,979 8 View

Are there other ways to take solar energy other than through photo-cells and thermal?

The amount of solar energy emitted to the earth is very large. Are there other ways to take solar energy other than through photo-cells and thermal?

08 December 2019 6,336 12 View

What is the maximum efficiency that can be achieved by a solar cell?

Technological developments in the field of solar-cell show efficiency improvements that are not very impressive. How much is he maximum efficiency that can be achieved by this device? Could it be...

08 December 2019 8,243 6 View

What is the error of the flow analysis in the pipe, between the one using the Bernoulli equation and the actual situation?

Bernoulli equation is very well-known equation and is very often used to analyze and design piping systems. But we know that in this equation there are at least 4 assumptions applied, namely: 1)...

18 July 2019 7,151 12 View

What are the strategies so that our papers are always accepted?

Publishing papers in reputed international journals is not easy. The right strategy is needed to write and submit it. Please help to contribute suggestions so that our papers can always be...

08 May 2019 7,061 7 View

Does each research have an applicative value?

To carry out a study, it takes a lot of cost, time and energy. Does research always have an applicative value? Does every research have to be commercialized? Your suggestions and opinions are...

08 May 2019 7,897 17 View

How to share discussion on RG effectively and politely?

Dear kind and distinguished lecturer and scholars, Currently we are discussing an exciting and essential topic for all of us, namely about the plan to create an international organization for...

01 January 1970 7,854 3 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

What test should I use to compare two or three means, if data is not normally distributed but sample size is > 30 in each group?

I personally feel this as a most confusing question. As per my understanding, if sample size is > 30, and sample is skewed, we can still use paramteric approach, as it will follow Z...

01 March 2021 1,587 6 View

Distribution of particles in metal matrix?

How would define the "good" and "poor" distribution of particles within the matrix. Is there a quantitative solution to assess the distribution of the particles, which then having denotation of...

28 February 2021 7,397 8 View

Online surveys for social sciences researchs: what are your opinions about this tool and how can we improve the research design to incorporate online?

Good morning everyone, Due to the pandemic, I conducted several online surveys. It is quite agile, not at all expensive, but there are several problems: the sample's representativeness and its...

21 February 2021 7,457 3 View

How to examine multicolineairty in backwards regression with binary variables?

I did a backwards regression with various binary variables, but some of the binary variables are negatively correlated with the outcome, which would make no sense cause the correlation univariate...

21 February 2021 4,392 3 View

Are there SDMs that can take in percentage data?

Hi everyone, I am wondering if anyone knows of a species distribution model that can take in percentage data (i.e. presence data with prevalence values attached to them)? The dataset I have...

18 February 2021 7,312 3 View

ZnS oxidizes to ZnO!!why??

when I put my ZnS solution in the chemical bath, the ZnS oxidizes so there are ZnO peaks appearing because of the reaction with the oxygen in the air, despite the fact that I close the beaker...

14 February 2021 5,778 9 View

What are the popular techniques for pre-processing measurement data in Smart Grid/Power System?

The data collected from various measurement devices often contains erroneous values - such as noise, missing values, etc. What are the popular techniques for pre-processing measurement data in...

14 February 2021 4,642 2 View

Hi, can a variable in a questionnaire be measured with a series of questions or it has to one question for one variable?

I am doing research on the impact of competitive bidding on project success and would like to use SEM. Project success shall be: cost overage, completion time, quality of works and variation...

13 February 2021 4,413 6 View

Why non-specific band appear on T-ARMS PCR?

Hi everyone. We want to know how can I remove the non-specific band amplification on this variant. Although the amplification of non-specific band is not as intense as the band that we want, but...

09 February 2021 588 2 View