Tuesday, 27 March 2018

watch out for predatory journals

Consider the 'Journal of Business and Economics.' This journal does not appear on the DHET accredited journals list (http://libguides.wits.ac.za/Scholarly_Research_Resources/Accredited_Journals). If you google the journal, you find it is published by Academic Star publishers. Is its content entirely about economics? No. So it is not in fact a real journal.


Predatory journals (which this may or may not be), accept journal articles without peer review. What predatory journals do, is they offer to publish your paper, then accept your paper as-is, then charge "page fees" for publication. They do not review for quality. This lowers the quality of academic work worldwide as researchers who are under pressure to "publish or perish" assume that it is a legitimate offer from a legitimate journal. There are also conferences which do this - they approach you to publish your work, because they assume you're desperate to get published and will therefore pay for it.

The following article from a UJ academic explains further.


Here is a South African author who reported this particular journal. As you can see, a trivial google of any journal will show you whether it is legit or not.


Here is a real journal:


See the difference? Look at the work quality, content, and topic adherence. Look at the publisher guidelines. Google the word "scam" with the journal name.

Basically they pretend to be legit, trick you into publishing with them, then ask for "page fees". However, the article you submit does not get peer-reviewed; it just gets published regardless, because the publishers just want the academics' money.




Sunday, 21 January 2018

Just discovered Nassim Nicholas Taleb

"One should never do anything without skin in the game. If you give advice, you need to be exposed to losses from it."




Interesting stuff.

In short, averages do not represent probabilities - rather bet on the two extreme ends to deal with the possibilities of worst-case scenarios.

Saturday, 20 January 2018

Apple Mail doesn't open attachments on double-click

If your copy of Apple Mail since macos 10.11 doesn’t open attachments with double-click, do this


1. Open Terminal

2. Type

mv  ~/Library/Containers/com.apple.mail  ~/Desktop ; sudo reboot

you can just copy/paste this.

3. Type your password (it won’t display), and press enter

Solution credit: Linc Davis, here: https://discussions.apple.com/thread/7280919

Monday, 25 December 2017

random thoughts on cryptocurrency future

We saw huge profit-taking at Christmas which drove the currency down across all cryptocurrency coins by about 25%. I think this was just profit-taking and not a sudden lack of faith in the market.

However, we’re definitely seeing weaknesses in btc at the moment. Slow response times - over a day - and very high fees - I’ve seen up to about $30. It’s unacceptable and unusable.

Ask yourself the following questions.

1. Is the future of currency digital?
2. Is bitcoin technologically sound? (will it be ok as-is for the future or will it have to be hacked to a new better version)

If you said yes/no, (as I do), then you should stay in cryptos but divest of btc itself.

If you said no/no (as skeptics do), then sell all and get out.

If you said yes/yes, then hold and see whether btc survives.

[obviously: If you said no/yes, then you’re confused, or don’t know what bitcoin is].

My suspicion is btc will survive as a reference currency - like the USD in fiat markets - but that it has a limited use case because of technical problems.

5.5 billion people competing for 16 million coins mean that each coin is split so that each adult gets 0.003 btc. Meaning that if we take it that 0.003 btc is equivalent to say a month's wages, and the average wage is say 1000 usd, it means that the target price for btc is 0.003 = 1000 usd. Or $ 343 000 per btc. Just a guess. It's looking pretty bad right now.

Wednesday, 13 December 2017

List of useful mac apps

This is mostly a note to self so that I can share with others when they ask which apps I recommend.

Android File Transfer.app (*) get files off android device
Android Studio.app (*) make android apps

djay.app (*) music deck
Last.fm.app (*) scrobbler (music recommendations)
Scrobomatic.app (*) scrobbler
Sound Studio.app (*) editing sound files
To MP3 Converter Free.app (*) convert funny audio files to mp3

Bartender 3.app (*) get all the mini icons in the menu bar under a menu
Battery Health 2.app (*) show battery status

CryptocurrencyTicker.app (*) show current cryptocurrency values in menubar
Exodus.app (*) best wallet app

Cleaner for Memory.app (*) clean memory caches to improve performance for new files
CopyLess.app (*) keep clipboard history and strip font/formatting from copy/paste
Cyberduck.app (*) best ftp client
Default Folder X.app (*) force open/save dialogs to place you somewhere intelligent, e.g. the folder the file came from!

A Better Finder Rename 9.app (*) bulk file renames, e.g. to strip spaces or other funnies
Bitdefender Virus Scanner.app (*) mostly for PC viruses to help PC users out
Carbon Copy Cloner.app (*) best backup app, makes a bootable full copy.
CleanMyDrive 2.app (*) looks for garbage
DropStuff.app (*) best compression tool
StuffIt Archive Manager.app (*) to open files from the above, listing files first
StuffIt Expander.app (*) to just expand files from the above without ceremonies

NEVER INSTALL : mackeeper. It’s malware.


DjVu Reader.app (*) to open DJVU files (like PDF)
IndexMaker2.app (*) to create document indexes for PDF
Kobo.app (*) epub viewer and store, canadian
iBooks Creator (*) from Apple, try it.

Font Book.app
FontXChange.app (*) great app to convert OTF/TTF/PS fonts into other formats
Google Drive.app

EasyBatchPhoto.app (*) batch resize or watermark images
Graphic.app (*) similar to corel draw / adobe illustrator - very good
Pixelmator.app (*) - similar to photoshop, much cheaper, very good

Image Capture.app

Google Chrome.app
Pst Easy Convert.app (*) - convert Outlook PST files to Apple mail files

join.me.app (*) screen sharing
Little Snitch Configuration.app (*) stop spyware from accessing websites - you approve/deny all interactions with internet. Basically lets you build a firewall on the fly.

Numbers.app (*) far prefer to excel as it remembers stuff like copy/paste
Pages.app (*) far prefer to Word as it lets you create a spreadsheet inside a wordprocessing document.
Papers.app (*) tool to manage academic research papers

Combine PDFs.app (*) to tack JPGs and PDFs together into single documents, or split them into single pages
PDF OCR X Enterprise Edition.app (*) convert bitmap PDFs to text-readable pdfs
PDF to JPG.app
PDF to Word - Convert PDF to Microsoft Word.app
PDF Toolkit.app
PDF-to-Text Converter.app
PDFKey Pro.app (*) to remove passwords on PDFs (you still have to enter the password, but once you’ve entered it, it removes it)

+ PDF to Word.app
MarsEdit.app (*) blogging app - saves you the bad interface of blog sites.
MindNode Lite.app (*) mindmapper
MyPoint Connector.app (*) to control PowerPoint from your phone
StakePoint Projects.app (*) PM app

programming and maths
Daum Equation Editor.app (*) to create math equations
MathMagic Lite.app (*) ditto
QR Crafter.app (*) to make QR codes
SEOAuditor.app (*) to check the SEO-goodness of your website
XML Site Mapper.app (*) to create an XML map for google search

Project Management and similar
Flowchart Designer lite.app
FreeMind.app (*) mind mapper
GanttProject.app (*) PM app
Project Viewer 365.app (*) to open MS Project files

smcFanControl.app (*) to control CPU fan speed
Twitterrific.app (*) twitter client
Unik.app (*) find and delete duplicate images in bulk, keeping highest quality ones

Adapter.app (*) convert any video to any other video
Air Video Server.app (*) play streaming video from your mac to your ipad
AVI to Any Lite.app (*) convert AVI
EasyMovieRotator.app (*) rotate a video (e.g. if you film with your phone sideways)
FLVPlayer.app (*) to play FLV files
MKV to Any Lite.app (*) convert MKV files
MP4 to Any Lite.app (*) convert MP4 files
To M4A Converter Lite.app
WMA to Any Lite.app
WMV Pro.app
Wondershare Video Converter Ultimate.app
Xilisoft Video Joiner 2.app (*) to join video clips easily and quickly
Xilisoft Video Splitter 2.app (*) to split...


Thursday, 16 November 2017

some crypto currency news and readings

Apologies for the link farm type of article, this is mostly to share with people interested with latest interesting stuff.

Academic certificates in blockchain:




Programming contracts in Ether:


Hedging cryptos:


Mastercard supports blockchain:






Why bitcoin stopped responding last weekend:


Amex supports XRP:


More scams, mostly because of last weekend:


POS software:



Tuesday, 7 November 2017

Correct English


Please note this page contains the author's opinions only and may differ from the Rules and Regulations of the University. Please consult the University Rules, which overrule these.

Nice page: http://www.vox.com/2015/3/3/8053521/25-maps-that-explain-english

On this page I list common errors people make in their usage of English, and provide the corrections. You'll notice that I can't make up my mind whether English is capitalised or not. I have the same problem with "earth." Anyone want to correct me?

PS If you don't think learning to spell is important, please consider the below:


Apostrophe, possessive and plural forms. This is used to indicate a missing letter which was historically present. Hence, the word "don't" contains an apostrophe because it is a contraction of "do not." the apostrophe replaces the O. Other examples are "let's", which is short for "let us", and "he's", which is short for "he has" or "he is". E.g., "He's got a car" means "he has got a car". Similarly, in the past, i.e., about 1000 years ago, English used -as for plural and -es for possessive (genitive). Since the loss of the vowel in these suffixes, we now use the apostrophe to denote the E in -es (genitive). e.g., John's apple's red colour—meaning, the red colour of the apple of John. If John has more than one apple, it would be apples (without an apostrophe) to indicate the presence of more than one apple, however, if we still want to talk about the red colour of John's apples, we have to add an apostrophe to indicate that we're not putting the -es of possessive form, but we know it should be there. So it would be: John's apples' red colour. American usage retains the second S, i.e., John's apples's red colour.

watch out for predatory journals

Consider the 'Journal of Business and Economics.' This journal does not appear on the DHET accredited journals list (http://libguide...