Autumn

When the leaves turn brown, the scent of the air is the best, you must be in autumn...

Winter

Suddenly tiny ice flakes fell down and all of places turn into romantic sites

Light Pageant

One of most beautiful site I visited in Japan

Line Follower Robot

Simple but very precious for me. Roughly speaking it does change my life up to now.

Laboratory card member

Currently student in Nakazawa Laboratory, Tohoku University. Lab's specialty is Ultrahigh speed optical communication.

Labortory Experiment

Ultrahigh Speed Optical Communication

Bersepeda Menuju Pantai yang tak Sampai ke Pantai

Hari ini hari Sabtu. Ceritanya ada ekiden. Terus karena cuacanya cerah banget (efek lagi winter, jd cerah dikit langsung kalap) aku ngide bersepeda ke pantai Sendai, tentunya ngajak kak yaya (partner exchanger dari indonesia). Karena aku emang hobi travelling jadi nekat nekat aja walaupun bermodal GPS doang. Dan untungnya kak Yaya nya mau! Wew!

 Akhirnya setelah ada kak yaya selesai dengan party di labnya di a kita pergi menuju pantai (niatnya). Karena aku gak bawa sepeda jadinya aku minjem sepeda salah satu senior mahasiswi indonesia juga yang tempat tinggalnya deket situ. Akhirmnya kita gowes.

Seperempat perjalanan sih aku tau itu jalannya man, tapi setelah itu blank hahaha hanya berpedoman pada GPS. I'm not really good in reading map. Jadi bermodal sok tau kita gowes. Gak jarang kita berhenti hanya untuk aku ngecek hape (dari aplikasi maps google pastinya, terimkasih Google) ngelihat apa kita udah bener nih tracknya,. Gak jarang juga salah yang menyebabkan kita harus muter muter hahaha..

unexpected bird 
Tadinya mau ngikutin sungai aja sih, soalnya kan kata pepatah setiap sungai akan bermuara ke laut ekekekek (emang fakta kali). Tapi ya gitu kita suka berhenti berhenti di jalan kalo ada sesuatu yang lucu. Satu jam berada di jalan (masih agak cerah walaupun udah agak malem; 3.30 pm) tiba-tiba something tak terduga terjadi! Ban sepeda kak Yaya tiba tiba bocor! Waduh gimana nih? Akhirnya kita terpaksa menghentikan perjalanan dan niatan untuk pergi ke pantai. Tapi mau balik ke dormitory juga jauh. Akhirnya kita memutuskan balik dengan mengambil rute yang berbeda. Yap, based on GPS and google maps told us.

Sekitar 10 menit kita berkelana tiba tiba kita menemukan toko sepeda(tokonya gede, namanya Ayahi)! dan tentunya dia nerima reparasi. Awalnya kita nanya mau beli tire baru, soalnya tire sepeda kak yaya emang udah ga banget wkwkwk.. Yaa nanyanya biasalah pake nihongo amari tabemasen ke mbak mbak yang di situ. Baik banget doi! Sepedanya dibawain masuk :3

Terus kita dikasihin ke seorang cowok crew toko sepeda itu juga. Gila! Jago banget si mas mas ngomong eigo (untuk seorang nihonjin). Ampe terharu gitu dehhh. Baik banget lagi. Doi nawarin kak yaya mau nembel doang apa ganti tire sekalian (soalnya emang udah ga banget). Dia menjelaskan pake bahasa inggris lancar banget! Akhirnya kak yaya milih yg nembel aja.
Satu hal yang aku dapat dari nihonjin tipe mereka adalah Nihonjin itu terlihat sangat mencintai pekerjaannya, apapun itu. Dan totalitas banget ngerjainnya. Contohnya aja mas mas tukang tambal ban itu (jangan bayangin tukang tambal ban di Indo, beda :) ), dia jago profesional banget dalam urusan mechanically things sepeda. Terus dia welcome banget, ngomongnya sopan, kerjanya semangat! Almost all of nihonjin I met are like this! They love their job and totally passionate on it!!!!
Akhirnya sepeda kak yaya beres kembali! Sebenernya sembari menunggu sepedanya beres, kita pergi ke sebrang jalan, ternyata ada tempat karaoke. Kita cuma lihat lihat doang kok di dalem.

Then, kita gowes lagi. Kali ini kita mau cari 7Eleven buat cari WiFi gratis. Rencananya kita mu ke Kappa Sushi makannya mau cari rute dulu. Rute ketemu kita ngegowes! Ternyata gak jauh banget, sekita 20 menit dari 7Eleven yang kita tumpangi wifi nya itu.

Yeay nyampelah di Kappa Sushi!!! Laper euy!





me and kak yaya

pulangnya kita dihadiahi salju... lumayan deras sih saljunya, tapi cantik :)







Japanese Friend and Astronomy (日本の友達と天文と星)

日本は自分の夢国。日本語がとても好きですだよ。大好き!多い日本人の友達がいます。自分の日本語が下手ですけどみんあは私に感謝。だから嬉しかっただよ。

My first Japanese friend in 東北大学 is a girl I met in 七十七銀行。 She's in charge of  helping exchange student to make bank account. She's 西條 詩織(Shiori Saijou). 二年、歯学部 (2nd year, dentistry student). She's very good in English. First time I met her, my Japanese was still very low so we were interacting by English instead. We went to eat soba and explore 仙台駅 (Sendai Station). 嬉しかっただよ。

 


After that day I met her, we still keep in touch. We're planning to eat okonomiyaki in the downtown.
Next destination is going to Onsen!!! (Can't wait for that!)

The next one is the most guys. I joined Astronomy club and all of the student there are nihonjin. I'm the only ryuugakusei. That's why I have to try to always speak in Japanese :) I really love and enjoy it because they're really appreciating me and my nihongo. I don't know why every nihonjin I met asked me whether english is my first languange -_- .  English is my third languange (一番は Bahasa Indonesia, 二番はJavanese, 三番はEnglish,そして Nihongo :p ). And I don't know why they always said that my nihongo is 上手 in case I'm starting to learn nihongo 2 months ago when arrived Sendai. I think I'm so below underdog. I still can't 100% watching anime without subtitles  :((((

Almost all of the student in Astronomy Club are guy and same age as me. We went to somewhere out of city, out of light, on the mountain, in the night. One hour riding a car I guess.
とてもきれいな空
きれいな空
The air was so cold but the sky was so bright. VERY BEAUTIFUL! This was my very first time watching a nude sky like that, in a very dark place which only starlight shined and flashed on :) とてもきれいな空!


with 雄太さん





with なかお
I was so happy^^. Now the weather is getting colder and colder. Snow already fell down. It's time to hibernating maybe :p

What Makes me Love Sendai [JPlace Part 2]

Places during Autumn


This is the part 2 of places I've visited in Japan.
Now the weather is getting colder and colder :( So here's the places I explored in fall season.

tohokudai festival. I can find lot of foods here. I can find almost all of the clubs in tohokudai in each classroom.



a very delicious taiyaki

Astronomy Club (天文学)









 Red leaves during my trip to Ayashi...
Fall is the best season 






Sendai Astronomical Observatory (仙台市天文台)



Principle Of Light Emission And Laser Operation

The goal for this topics is:
To give the reader understanding of the basic principles of light emitting diode and the laser (both are optical source used in optical communication)

1. BASIC PRINCIPLE OF LIGHT EMISSION AND LASER OPERATION

1.1 Mechanism of light emission

internal energy : effective energy from outermost electron 
Plank's constant : 6.625 x 10-34 J-s

Energy levels and mechanism of transition are divided by three (see fig1.1):
1. Spontaneous emission 
atom is initially in the higher energy level 2 and the light of frequency is emitted spontaneously and randomly without any external light triggering
*both absorption and stimulated emission, the light frequency is pumped into the atom from an external source*
2. Absorption
atom in energy level 1 can absorb photon of the input light and make transition to energy level 2 
3. Stimulated emission
atom is initially in energy level 2 with a probability proportional to the intensity of the external light intensity  (forms of basis laser laser operation)
fig 1.1

1.2 Mechanism of Amplification and Light Oscillation

How light can be amplified?
"Laser" is an acronym for light amplification by stimulated emission of radiation, which describes very succinctly how a laser works.
An optical amplifier is a device which receives some input signal and generates an output signal with higher optical power. Typically, inputs and outputs are laser beams, either propagating as Gaussian beams in free space or in a fiber. The amplification occurs in a so-called gain medium, which has to be “pumped” (i.e., provided with energy) from an external source. Most optical amplifiers are either optically or electrically pumped.

Lets consider next about how light can be amplified. Now we consider Boltzmann distribution:

(k=1.38 x 10-23 J/K) T is temperature (K).

In equation above we can compre the ratio of N1 and N2. We can define it into two condition:
1. N1 < N2
The number of absorption exceeds the number of stimulated emissions and there is a net loss or attenuation, of the input light beam.
2. N1 > N2
This condition is achieved because of energy can be introduced from outside in appropriate way then sometimes it is possible to make some number of atoms in level 2 greater than the number in level 1. So the number of photons produced by stimulated emission is larger than the number removed by absorption. That's making the intensity of the input light is increased.

Imoni (芋煮) party with Laboratory Members (Nakazawa Lab)

My First Imoni Party in Sendai with LABORATORY members

It was 2 weeks ago I and other laboratory member including Professors and Assoc. Professors had imonikai. Another good time in Sendai! Love Japan, Love Sendai, Love My Laboratory!
here is if you want to know more about my Laboratory but unfortunetaly the website was latest updated on 2011 :(
however you can still take a look at the link here --> Nakazawa Laboratory
Imoni (芋煮) is a type of thick potato and meat soup eaten traditionally in the autumn in the Tōhoku region of Japan. Yamagata Prefecture in particular is famous for its imoni, but other prefectures in the region also have their own different varieties.
Imoni is eaten like any soup, primarily during the late summer and early autumn, but is most famous as an outdoor food. In the autumn, groups of people preparing imoni around a fire near a river is considered a sign of the season, and convenience storesmaintain a stock of firewood and other supplies just for the occasion. (source: http://en.wikipedia.org/wiki/Imoni)
Imoni party was so fun, the food was very delicious. We cooked two types of soup. One is butaniku (pork) and other is beef. Of course I didn't eat the pork. 
This is the pork soup
Beef soup with Imo (small potato but not really tasted like potato)

It was cooked by my senpai-s in the lab. There're 2 B4 student (4th year Bachelor), 2 M1 (1st year Master), 2 M2, 2 D2 (2nd year Doctoral), 1 D3, 1 Postdoctoral Researcher, 1 Secretary, 1 Asst. Professor, 2 Assoc. Professors, and 2 Professors. We had a great time at that time.
students & lab members ( /from left/nakao-san, seya-san, and yu-san)
Not only that we also grilled some beefs and other foods. The party supposed to be held close to the Hirose river but unfortunetely the weather was not pretty good do we decided to have the party near the building. The lab only has 2 women member and one secretary, moreover I'm the youngest member in the lab tho. 
(from left)Seya-san, Nakazawa sensei, me, and Kasai Sensei were posed during grilled the fish

dat fish..... dat eggplant...

having barbecue party and the air was so cold

use your own chopstick

Beside cooking we also have a great time talking each other and of course taking picture together, kampai for the beer (of course i didn't, I drank juice and tea).
Kampaiiii
Good time with shinozaki-san, hirooka sensei, kasai sensei and wang-san (she's from china)
After our stomach is full then we take a photo together
with 2 Professors in my Laboratory. Nakazawa Sensei and Inutake Sensei.
full team!
Okay, that was my imoni party with all of laboratory members. Good time, amazing people, fascinating place. Alhmadulillah...