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making graphite work making graphite work vineri 4 ianuarie 2013 traduceri legalizate revin cu cateva precizari despre legalizarea traducerilor spuneam ca o traducere legalizata se realizeaza la notar si reprezinta o certificare a traducerii serviciul notarial se numeste legalizarea semnaturii traducatorului mai simplu spus in incheierea de legalizare notarul zice da omul care a semnat si stampilat actul este intr adevar traducator pentru ca notarul sa poata sa certifice acest lucru traducatorul trebuie sa fie inscris in prealabil la notarul respectiv si sa depuna specimen de semnatura si stampila la acel notar astfel notarul putand sa confrunte stampila si semnatura de pe documentele ce trebuie legalizate cu cele depuse de catre traducator atunci cand se inscrie la un notar si depune specimene de semnatura si stampila traducatorul trebuie sa depuna si o copie dupa autorizatia de traducator emisa de ministerul justitiei publicat de omidiu la 15 01 trimiteți prin e mail postați pe blog trimiteți pe x distribuiți pe facebook trimiteți către pinterest etichete traducere legalizata traduceri traduceri autorizate traduceri legalizate marți 8 februarie 2011 this may be the last straw so i bought this awesome laser pointer pen stylus 3 in 1 thingy for 20 from the bookstore and the douchebag reu student who s too shy to ask to borrow it has both stolen and lost it that i can deal with after all it s just a pen and my mom via my student id account paid for it but today i walked into my office to find all my books pushed aside and the reu student s computer courtesy of uk the rotten bastards on my desk so essentially i have no desk we can t isolate the pcn radical all the parts for the matrix isolation system are in the machine shop and now i have no desk and i was beginning to think not doing an reu was a good thing thanks for proving me wrong uk publicat de omidiu la 11 21 trimiteți prin e mail postați pe blog trimiteți pe x distribuiți pe facebook trimiteți către pinterest etichete contabilitate firma de contabilitate foraje laser last straw pcn reu scoala de soferi traduceri autorizate traduceri germana uk tag team back again so it s been a while since my last post i ve been spending a lot of time learning the laser lab and reorganizing the ol disiloxane synthesis project my biggest problem at the moment is getting my hands on a reliable supply of hydrogen iodide which we use in turn to make silyl iodide using phenylsilane matheson tg has stopped selling it probably because it wasn t economically sound to offer it during the synthesis i use which involves red phosphorus iodine and water unwanted byproducts tend to coat the iodine shards and insulate the valuable inner iodine from reacting thus i decided i m going to beat the hell out of the iodine grounding it into a powder with a large surface area and releasing some stored up anger in the process the alternative to perfecting the syntheses of hi and silyl iodide is making a different halosilane from pre bought hooray hydrogen bromide or chloride the strange thing is most of the halosilane literature i ve looked at used silyl chloride or silyl bromide where my advisor got the idea for silyl iodide i have no idea perhaps the disiloxane hydrolysis doesn t work quite as well with bromide or chloride yet hexamethyldisiloxane is made using silyl chloride cloush is in ohio for a conference this week when the cat is away the mice will play d publicat de omidiu la 11 20 trimiteți prin e mail postați pe blog trimiteți pe x distribuiți pe facebook trimiteți către pinterest etichete firma de contabilitate lab research matheson tg ohio phenysilane traduceri traduceri legalizate gems from uk s inorganic lab lab safety webpage that s not dry ice i didn t take the picture but the caption underneath said that these peroxide crystals autodetonated shortly after this photo was taken they formed in an old bottle of ispropyl ether the page says something about not letting liquid oxygen condense in a trap which seems odd to me anything colder than liquid nitrogen seems too expensive to use in an undergrad lab it links to a video showing purdue students lighting a charcoal grill with a lit cigarette and three gallons of liquid oxygen if we really are going to possess the cooling power to condense oxygen out of the air in che 450g i commend you university of kentucky edit the boiling point of oxygen is higher than that of nitrogen so liquid oxygen will condense out of a constant stream of air my bad oh wow this is a good one in the spring of 1997 in advanced organic lab che 533 someone dumped methylene chloride into a waste container containing some icky stuff including nitric acid he capped the waste bottle and a couple of minutes later bam shards of glass and chemicals went flying across the room miraculously no one was injured publicat de omidiu la 11 18 trimiteți prin e mail postați pe blog trimiteți pe x distribuiți pe facebook trimiteți către pinterest etichete foraje puturi apa lab accidents scoala de soferi traduceri traduceri engleza traduceri germana traduceri italiana pda for pdis this paper caught my eye because i recalled my one regular c ommenter come on dear readers where are you working with perylenes in the past the reactant in the middle is imide substituted perylene diimide pdi dmp pdi compound 1a has some interesting solid state photochemical quirks so who knows substituting the perylene core could lead to the next big thing in photonic organics so the author says the first reaction described looks less than impressive for 1a 26 came out a mixture of dibrominated isomers 1 6 3a and 1 7 3a 57 came out monobrominated and 15 remained unreacted restricted rotation of the bulky r groups about the c n bond meant two isomers for each potentially brominated carbon the author goes on to describe a reaction using a refluxing solution of bromine that gives exclusively dibrominated product overnight with a 1 7 1 6 ratio of 3 1 the regioisomers can be separated by recrystallization from a 1 1 solution of dichloromethane and hexane sonogashira coupling of 2a with tms acetylene works as does nucleophilic substitution by piperidine bromination causes an interesting core twist vibration involving well the twisting of the perylene core energy barriers associated with the motion were relatively low and thus interconversion between the two twist states of the molecule is relatively easy publicat de omidiu la 11 17 trimiteți prin e mail postați pe blog trimiteți pe x distribuiți pe facebook trimiteți către pinterest etichete bromination contabilitate energy foraje puturi pda traduceri autorizate traduceri legalizate vicious rumor enter the matrix my lab s matrix ir apparatus is almost done and naturally the guy i m working with just had to have a baby in the meantime i get to watch over it and get things ready for our first target molecule chlorosilylene it is the silicon analogue of the one the only chlorocarbene herzberg was the first to investigate this molecule having produced it in 1964 by flash photolysis of chlorosilane as research on cvd intermediates picked up steam a number of research groups obtained varied results on the extent to which chlorosilylene is produced during cvd the clouthier group of which i am a humble member revived spectroscopic studies of the radical by performing laser induced fluoresence experiments on it in 1997 they obtained a whole slew of rotational constants geometric parameters and most importantly vibrational frequencies exhibited by the molecule that s right a whole slew our goal is to observe hsicl s ground state vibrational frequencies directly by jolting trichlorosilane in an electric discharge and performing matrix ir pictures of the apparatus to follow soon publicat de omidiu la 11 16 trimiteți prin e mail postați pe blog trimiteți pe x distribuiți pe facebook trimiteți către pinterest etichete cvc firma de contabilitate foraje puturi apa lab research scoala de soferi spectroscopy the matrix traduceri traduceri legalizate latest on the rotaxane front something about rotaxanes intrigues me if you think about it the fact that such massive molecules can come together to form ordered interlocked units is an outright entropic miracle the field of rotaxane synthesis is particularly suited to what i like to call miracle reactions reactions with laughably simple procedures that give complicated molecules in disturbingly high yield one such reaction can be found in this recent paper by hirose et al from osaka university their idea stylized in the picture was to first connect the center of a dumbbell to a ring then use nucleophilic attack specifically aminolysis by the other half of the dumbbell to form the final rotaxane hiratani did something similar to this back in 2002 the ring is a phenolic crown ether with side groups attached why the phenol because the first step is an esterification involving the phenolic oh which points inside the ring and the half axle a benzoyl chloride the resulting half rotaxane is just a benzene stoppered ester of the crown ether to form the final rotaxane an amine with a bulky group attached is added to the half rotaxane nitrogen attacks the carbonyl carbon of the ester group and voila the axle becomes an amide and the ring reverts back to a phenolic crown ether miraculously this reaction requires no heat or special treatment of any kind aside from column chromatography put the stuff together stir wait three days evaporate the solvent and voila rotaxane city publicat de omidiu la 11 15 trimiteți prin e mail postați pe blog trimiteți pe x distribuiți pe facebook trimiteți către pinterest etichete firma de contabilitate foraje puturi neato nitrogen phenol rotaxanes traduceri autorizate traduceri legalizate postări mai vechi pagina de pornire abonați vă la postări atom cele mai tari linkuri traduceri legalizate etichete bromination 1 bromosilane 1 contabilitate 3 cvc 1 energy 1 firma de contabilitate 4 foraje 2 foraje puturi 2 foraje puturi apa 2 lab accidents 2 lab research 3 laser 1 last straw 1 matheson tg 1 neato 1 nitrogen 1 ohio 1 pcn 1 pda 1 phenol 1 phenysilane 1 reu 1 rotaxanes 1 scoala de soferi 4 spectroscopy 1 the matrix 1 traducere legalizata 1 traduceri 5 traduceri autorizate 4 traduceri engleza 1 traduceri germana 2 traduceri italiana 1 traduceri legalizate 5 uk 1 vicious rumor 1 arhivă blog 2013 1 ianuarie 1 traduceri legalizate 2011 7 februarie 7 tema filigran un produs blogger