Dissociative Electron Attachment Cross Sections for H₂ and D₂

New measurements of the absolute cross sections for dissociative electron attachment (DEA) in molecular hydrogen and deuterium are presented which resolve previous ambiguities and provide a test bed for theory. The experimental methodology is based upon a momentum imaging time-of-flight spectrometer that allowed us to eliminate any contributions due to electronically excited metastable neutrals and ultraviolet light while ensuring detection of all the ions. The isotope effect in the DEA process in the two molecules is found to be considerably larger than previously observed. More importantly, it is found to manifest in the polar dissociation process (also known as ion pair production) as well

Neomejen dostop do informacijskih sistemov z mobilnimi napravami

Purpose: Mobile devices have become an indispensible part of modern communicationsthey enable easy access to the Internet and also remote manipulation of data stored in corporate information systems. The number of mobile device users is on the rise, but most of them don’t comprehend completely the less obvious functions of these devices. Users also have almost no control over background computer programs, because they run without their knowledge and volition. From the standpoint of information security, a lack of awareness of the risks can seriously compromise the integrity of corporate networks and information systems. The weakest links are users, but also the technology itself. To ensure the functioning and security of information systems, corporations and individual users should learn about protective mechanisms. It is also important that users adhere to implemented (internal) safety regulations. Design/Methods/Approach: We used descriptive and comparative methods, and made an overview of published literature, as well as processes pertaining to the use of mobile devices and related security issues. We compared general elements of information security in regard to the use of mobile devices. Findings: At present mobile devices are more and more frequently used to access information systems. The majority of users are concerned almost exclusively with the question, how to get uninterrupted remote access to data, but far less with security issues. This paper presents some guidelines for achieving and maintaining information security. Research limitations/implications: It has been noted, that this is a time of turbulent development and evolution in the field of mobile devices, and also related security issues, so best practices haven’t been defined yet. Corporations and other organizations have just recently begun defining guidelines to eliminate security breaches through mobile devices, therefore a comparison of their implemented solutions is practically impossible. VS_ Practical implications: We propose guidelines, which can be used to: minimize information security risks posed by mobile devicesevaluate the current state of information securityand implement protective measures against cyber threats encountered by corporations and individual users of mobile devices. Originality/Value: Information security is a relatively new field because mobile devices and remote access to the Internet and data have just recently come into wider use. At the same time security issues and protective measures have stayed largely overlooked. Security threats are many, so it is impervious that users learn more about them and adopt some necessary security measures.Namen prispevka: Mobilne naprave so postale stalnica vsakodnevnega komuniciranja, dostopa do omrežij in oddaljenega dela s podatki v zaprtih korporativnih informacijskih sistemih. Število uporabnikov se skokovito povečuje, malo uporabnikov pa delovanje naprav razume, prav tako pa nimajo pregleda nad delovanjem elementov naprave za komunikacijo v ozadju, kjer ni potrebna direktna interakcija z uporabnikom. Nepoznavanje, s stališča informacijske varnosti oziroma varne uporabe mobilnih naprav, lahko resno ogrozi informacijski sistem celotne organizacije. Šibka člena pri zagotavljanju informacijske varnosti sta uporabnik in tehnologija. Za zagotavljanje stalnega dela in ustrezno stopnjo varnosti je pomembno poznavanje varnostnih mehanizmov s strani uporabnikov in spoštovanje predpisanih omejitev za varno delo. Metode: Uporabljeni sta bili deskriptivna in primerjalna metoda. Narejen je bil pregled literature in postopkov, ki navajajo rabo mobilnih naprav in njihovo zaščito. Primerjani so bili elementi splošne in varne rabe mobilnih naprav z vidika informacijske varnosti. Ugotovitve: Uporaba mobilnih naprav za oddaljen dostop do informacijskih sistemov je v začetni fazi. Večina organizacij in uporabnikov se ukvarja zgolj z zagotavljanjem dostopa in delom, pozabljajo pa na informacijsko-varnostni vidik. Prispevek predstavlja smernice za vzpostavitev večje stopnje informacijske varnosti. Omejitve/uporabnost raziskave: Zaradi turbolentnega razvoja in sprememb na omenjenem področju je razumevanje uporabe mobilnih naprav v začetni fazi in dostopnost do uspešnih praks (angl. best practices) omejena. Izdelava smernic varne rabe mobilnih naprav in njihovo udejanjanje v praksi je v začetni fazi, zato ni možna primerjalna analiza uspešnosti predlaganih ukrepov. Praktična uporabnost: Predstavljene so smernice varne rabe mobilnih naprav, ocena trenutnega stanja informacijske varnosti in smernice za zaščito pred grožnjami, katerim so izpostavljeni organizacije in posamezniki ob uporabi mobilnih naprav. Izvirnost/pomembnost prispevka: Uporabniki so šele pred kratkim začeli množično uporabljati mobilne naprave za dostopanje do podatkov, zato so nova tudi informacijsko-varnostna vprašanja, vezana na mobilno tehnologijo. Širša raba oddaljenega dostopanja se šele uveljavlja, varnostni postopki in mehanizmi pa so zanemarjeni. Ker se kažejo možnosti zlorabe in uresničenja groženj, pa je pred udejanjanjem pomembno zagotoviti ustrezna znanja in postopke, da ne pride do tega

A modular syslog server with input filter

Network device monitoring traditionally depends on ICMP, SNMP and syslog. The latter is, due to its simplicity, used in environments where network devices are monitored by IT personnel that do not necessarily work in networking field. In this thesis, network monitoring protocols have been assessed in detail, and typical usage explained. Also, development, testing and implementation of a modular syslog server is presented. Four modules have been developed to save messages to SQL server or text file, or to forward them using e-mail or SMS. Key component of this system is the input filter which lets only relevant messages through. The solution was designed to consume little resources and has been tested on a large number and different types of network devices