Showing posts with label info. Show all posts
Showing posts with label info. Show all posts

SOSROBAHU

Sosrobahu is a construction technique which allows long stretches of flyovers to be constructed above existing main roads with a minimum of disruption to traffic. The technique was designed by Tjokorda Raka Sukawati and involves the construction of the horizontal supports for the highway beside the existing road, which are then lifted and turned 90 degrees before being placed on top of the vertical supports to form the flyover pylons.

This technique is of considerable value in increasing road mileage in large cities where there is restricted space for new roads and where the closure of existing roads for the length of time to build a flyover using normal construction techniques would impose significant economic costs.

Background
By the 1980s, [[Jakarta]] was experiencing increased [[traffic congestion]], and flyovers were seen as one solution to the improving transport infrastructure. One construction company operating at that time was PT Hutama Karya, which was granted a contract to build a highway above bypass A Yani, an extremely important stretch of [[highway]] where it was vital that the road would continue to be open to traffic throughout the period of construction.

In addition to this challenge, PT Hutama Karya were also granted a [[contract]] to build a flyover between [[Cawang]] and [[Tanjung Priok]] in 1987. The most difficult issue was the requirement to support the road with a row of concrete pylons (pier shafts) 30 m apart, on top of which would sit the 22 m wide road supports. The [[vertical direction|vertical]] pier shafts were to be sextagonal in shape with a diameter of 4 m, and were to sit in the central lane of the existing road. The erection of the pier shafts was not difficult; what caused problems were the poured [[concrete]] pier heads. With conventional construction techniques, the pier heads would be moved into place with the help of [[iron]] supports beneath the outspread pier heads, but the use of iron supports would necessitate the closure of the road below. Another option was to support the pier heads from above, but this increased the costs of the project.

In response to these problems, Sukawati had the idea of initially erecting the concrete pier shafts and then building the poured concrete pier heads in the centre lane, [[Parallel (geometry)|parallel]] to the existing roadway, and then raising and turning the pier heads 90 degrees into place. The only problem with this idea was that the pier heads weigh approximately 480 tonnes each.


Inspiration from a hydraulic car-jack
One day Tjokorda was working on his 1974 [[Mercedes-Benz]], which he had [[Jack (device)|jacked]] up so that the back two [[wheels]] were supported on the slippery floor of the garage where some oil had been accidentally spilled. When the car was pushed, it pivoted with the jack as the [[Axis of rotation|axis]]. He noted that it is a [[principle]] of [[physics]] that when [[friction]] is banished it is easy to move even the heaviest of objects.

This event inspired the realization that a [[hydraulic]] pump could be used to lift heavy objects and, as long as they were supported by something slippery, the heavy objects could be easily moved. Tjokorda's goal was to lift and move concrete pier heads each weighing 480 tonnes.

Tjokorda conducted trials with cylinders 20 cm in diameter converted into a hydraulic lift and loaded with 80 tonnes of concrete. The weight was successfully lifted and turned slightly, but could not then be lowered as the position of the hydraulic jack had shifted. Tjokorda then made some improvements on the original [[design]], and in subsequent lifts the hydraulic jack stayed stable even with the full weight of the concrete above it.

Other problems to be overcome included establishing the best type of [[oil]] to use that wouldn't lose its [[viscosity]]. The type of oil was a critical factor because it was the oil which transmitted the [[force]] required to lift the heavy concrete pier heads.

After the trials, Tjokorda finalised his design called the LBPH (the Indonesian acronym for Free Moving Platform) which consisted of a two concrete discs with a diameter of 80 cm enclosed in a container. Although only 5 cm thick, the discs are capable of supporting a weight of 625 tonnes each.

Between the two plates is pumped [[lubricating]] oil. A [[rubber]] seal around the edges of the plates protected against the oil escaping under the high forces experienced during the lift. The oil in the container was connected to a hydraulic pump through a small [[pipe (material)|pipe]]. This hydraulic system was capable of lifting loads using a pressure of 78 [[kilogram-force|kgf]]/[[square centimetre|cm²]] (7.6 [[megapascal|MPa]], although the reasons for this were a mystery to Tjokorda at that time.

Field trials
The new technique had not yet been trialled because of time constraints, however Tjokorda was certain that it would work and was willing to bear the responsibility should the concrete pier heads not be able to be turned 90 degrees as required for the construction of the flyover.

On the 27 July 1988 at 22:00 Jakarta time, the hydraulic pump was pressurized to 78 kgf/cm² (7.6 MPa). The pier head, despite lack of iron supports, was lifted and placed on top of the pier shaft and then with a light push was turned 90 degrees into its final position. The oil was then slowly pumped out and the pier head was lowered onto the shaft. The LPBH system was then shut down as it required heavy machinery to move it. Because he was worried that the single pier shaft and head might shift for a lack of support, he propped them up with eight concrete supports, 3.6 m in diameter. The LPBH was then used to raise the other pier heads over their respective shafts.

Naming the technique and the granting of a patent

In November 1989, [[Suharto|President Soeharto]] of [[Indonesia]] gave the name Sosrobahu to the new technology. The name was taken from a character in the [[Mahabharata]], and derives from [[Old Javanese]] for thousand (sosro) shoulders (bahu).

Tjokorda's [[invention]] was used by US engineers in the construction of a bridge in [[Seattle]]. They placed the oil under a pressure of 78 kg/cm² (7.6 MPa) as per Tjokorda's original theories. Tjokorda himself wanted to investigate further the limits of his invention and built himself a laboratory where he successfully tested the LPBH to a limit of 78.05 kgf/cm² (7.654 MPa).

[[Patents]] have been granted for the invention from Indonesia, [[Japan]], [[Malaysia]], and the [[Philippines]], and has been applied for in [[South Korea]]. The Indonesian patent was granted in 1995, while the Japanese patient was granted in 1992. The technology has been exported to the Philippines, Malaysia, [[Thailand]] and [[Singapore]]. The longest stretch of overpass built using this technique is in [[Metro Manila]], [[Philippines]] at the Villamor/Bicutan link located at the southern part of the metropolis. In the Philippines, 298 supports have been erected, while in [[Kuala Lumpur]], the figure is 135. When the technology was introduced to the Philippines, the President of the Philippines, [[Fidel Ramos]] commented: "This is an Indonesian invention, but is also an [[ASEAN]] invention".

A second version of the technology has been developed. Whereas the first version used a steel anchor inserted in a concrete base, the second version uses a single plate with a hole in the middle which is not only simpler, but also significantly speeds up the time it takes to erect a pylon from 2 days to 45 minutes. It is expected that the lifespan of flyovers constructed using the Sosrobahu method will be approximately 100 years.

According to Dr. [[Drajat Hoedajanto]], an expert from the [[Bandung Institute of Technology]], Sosrobahu is a very simple solution to the problem of erecting flyover pylons and is suitable for use in the construction of elevated toll roads which have traffic running underneath them. Sosrobahu is clearly a useful and versatile technology. {{Citation needed|date=March 2011}}

From Wikipedia, the free encyclopedia

ALBERT EINSTEIN

Albert Einstein (play /ˈælbərt ˈaɪnstaɪn/; German: [ˈalbɐt ˈaɪnʃtaɪn] ( listen); 14 March 1879 – 18 April 1955) was a German-born theoretical physicist who developed the theory of general relativity, effecting a revolution in physics. For this achievement, Einstein is often regarded as the father of modern physics, and one of the most prolific intellects in human history.[2] He received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect".[3] The latter was pivotal in establishing quantum theory within physics.

Near the beginning of his career, Einstein thought that Newtonian mechanics was no longer enough to reconcile the laws of classical mechanics with the laws of the electromagnetic field. This led to the development of his special theory of relativity. He realized, however, that the principle of relativity could also be extended to gravitational fields, and with his subsequent theory of gravitation in 1916, he published a paper on the general theory of relativity. He continued to deal with problems of statistical mechanics and quantum theory, which led to his explanations of particle theory and the motion of molecules. He also investigated the thermal properties of light which laid the foundation of the photon theory of light. In 1917, Einstein applied the general theory of relativity to model the structure of the universe as a whole.[4]

He was visiting the United States when Adolf Hitler came to power in 1933, and did not go back to Germany, where he had been a professor at the Berlin Academy of Sciences. He settled in the U.S., becoming a citizen in 1940. On the eve of World War II, he helped alert President Franklin D. Roosevelt that Germany might be developing an atomic weapon, and recommended that the U.S. begin similar research; this eventually lead to what would become the Manhattan Project. Einstein was in support of defending the Allied forces, but largely denounced using the new discovery of nuclear fission as a weapon. Later, together with Bertrand Russell, Einstein signed the Russell–Einstein Manifesto, which highlighted the danger of nuclear weapons. Einstein taught physics at the Institute for Advanced Study at Princeton, New Jersey, until his death in 1955.

Einstein published more than 300 scientific papers along with over 150 non-scientific works.[4][5] His great intelligence and originality have made the word "Einstein" synonymous with genius.[6]

Early life and education
A young boy with short hair and a round face, wearing a white collar and large bow, with vest, coat, skirt and high boots. He is leaning against an ornate chair.
Einstein at the age of 4
Studio photo of a boy seated in a relaxed posture and wearing a suit, posed in front of a backdrop of scenery.
Albert Einstein in 1893 (age 14)

Albert Einstein was born in Ulm, in the Kingdom of Württemberg in the German Empire on 14 March 1879. His father was Hermann Einstein, a salesman and engineer. His mother was Pauline Einstein (née Koch). In 1880, the family moved to Munich, where his father and his uncle founded Elektrotechnische Fabrik J. Einstein & Cie, a company that manufactured electrical equipment based on direct current.

The Einsteins were non-observant Jews. Albert attended a Catholic elementary school from the age of five for three years. Later, at the age of eight, Einstein was transferred to the Luitpold Gymnasium where he received advanced primary and secondary school education till he left Germany seven years later.[8] Although it has been thought that Einstein had early speech difficulties, this is disputed by the Albert Einstein Archives, and he excelled at the first school that he attended.

His father once showed him a pocket compass; Einstein realized that there must be something causing the needle to move, despite the apparent "empty space".[10] As he grew, Einstein built models and mechanical devices for fun and began to show a talent for mathematics.[7] In 1889, Max Talmud (later changed to Max Talmey) introduced the ten-year old Einstein to key texts in science, mathematics and philosophy, including Immanuel Kant's Critique of Pure Reason and Euclid's Elements (which Einstein called the "holy little geometry book").[11] Talmud was a poor Jewish medical student from Poland. The Jewish community arranged for Talmud to take meals with the Einsteins each week on Thursdays for six years. During this time Talmud wholeheartedly guided Einstein through many secular educational interests.[fn 1][fn 2]

In 1894, his father's company failed: direct current (DC) lost the War of Currents to alternating current (AC). In search of business, the Einstein family moved to Italy, first to Milan and then, a few months later, to Pavia. When the family moved to Pavia, Einstein stayed in Munich to finish his studies at the Luitpold Gymnasium. His father intended for him to pursue electrical engineering, but Einstein clashed with authorities and resented the school's regimen and teaching method. He later wrote that the spirit of learning and creative thought were lost in strict rote learning. In the spring of 1895, he withdrew to join his family in Pavia, convincing the school to let him go by using a doctor's note.[7] During this time, Einstein wrote his first scientific work, "The Investigation of the State of Aether in Magnetic Fields".[14]

Einstein applied directly to the Eidgenössische Polytechnische Schule (ETH) in Zurich, Switzerland. Lacking the requisite Matura certificate, he took an entrance examination, which he failed, although he got exceptional marks in mathematics and physics.[15] The Einsteins sent Albert to Aarau, in northern Switzerland to finish secondary school.[7] While lodging with the family of Professor Jost Winteler, he fell in love with Winteler's daughter, Marie. (His sister Maja later married the Wintelers' son, Paul.)[16] In Aarau, Einstein studied Maxwell's electromagnetic theory. At age 17, he graduated, and, with his father's approval, renounced his citizenship in the German Kingdom of Württemberg to avoid military service, and in 1896 he enrolled in the four year mathematics and physics teaching diploma program at the Polytechnic in Zurich. Marie Winteler moved to Olsberg, Switzerland for a teaching post.

Einstein's future wife, Mileva Marić, also enrolled at the Polytechnic that same year, the only woman among the six students in the mathematics and physics section of the teaching diploma course. Over the next few years, Einstein and Marić's friendship developed into romance, and they read books together on extra-curricular physics in which Einstein was taking an increasing interest. In 1900 Einstein was awarded the Zurich Polytechnic teaching diploma, but Marić failed the examination with a poor grade in the mathematics component, theory of functions.[17] There have been claims that Marić collaborated with Einstein on his celebrated 1905 papers,[18][19] but historians of physics who have studied the issue find no evidence that she made any substantive contributions.[20][21][22][23]
Marriages and children
Main article: Einstein family

In early 1902, Einstein and Mileva Marić had a daughter they named Lieserl in their correspondence, who was born in Novi Sad where Marić's parents lived.[24] Her full name is not known, and her fate is uncertain after 1903.[25]

Einstein and Marić married in January 1903. In May 1904, the couple's first son, Hans Albert Einstein, was born in Bern, Switzerland. Their second son, Eduard, was born in Zurich in July 1910. In 1914, Einstein moved to Berlin, while his wife remained in Zurich with their sons. Marić and Einstein divorced on 14 February 1919, having lived apart for five years.

Einstein married Elsa Löwenthal (née Einstein) on 2 June 1919, after having had a relationship with her since 1912. She was his first cousin maternally and his second cousin paternally. In 1933, they emigrated permanently to the United States. In 1935, Elsa Einstein was diagnosed with heart and kidney problems and died in December 1936.[26]

Patent office
After graduating, Einstein spent almost two frustrating years searching for a teaching post, but a former classmate's father helped him secure a job in Bern, at the Federal Office for Intellectual Property, the patent office, as an assistant examiner.[27] He evaluated patent applications for electromagnetic devices. In 1903, Einstein's position at the Swiss Patent Office became permanent, although he was passed over for promotion until he "fully mastered machine technology".[28]

Much of his work at the patent office related to questions about transmission of electric signals and electrical-mechanical synchronization of time, two technical problems that show up conspicuously in the thought experiments that eventually led Einstein to his radical conclusions about the nature of light and the fundamental connection between space and time.[29]

With a few friends he met in Bern, Einstein started a small discussion group, self-mockingly named "The Olympia Academy", which met regularly to discuss science and philosophy. Their readings included the works of Henri Poincaré, Ernst Mach, and David Hume, which influenced his scientific and philosophical outlook.

Academic career
In 1901, Einstein had a paper on the capillary forces of a straw published in the prestigious Annalen der Physik.[30] On 30 April 1905, he completed his thesis, with Alfred Kleiner, Professor of Experimental Physics, serving as pro-forma advisor. Einstein was awarded a PhD by the University of Zurich. His dissertation was entitled "A New Determination of Molecular Dimensions".[31] That same year, which has been called Einstein's annus mirabilis or "miracle year", he published four groundbreaking papers, on the photoelectric effect, Brownian motion, special relativity, and the equivalence of matter and energy, which were to bring him to the notice of the academic world.

By 1908, he was recognized as a leading scientist, and he was appointed lecturer at the University of Bern. The following year, he quit the patent office and the lectureship to take the position of physics docent[32] at the University of Zurich. He became a full professor at Karl-Ferdinand University in Prague in 1911. In 1914, he returned to Germany after being appointed director of the Kaiser Wilhelm Institute for Physics (1914–1932)[33] and a professor at the Humboldt University of Berlin, although with a special clause in his contract that freed him from most teaching obligations. He became a member of the Prussian Academy of Sciences. In 1916, Einstein was appointed president of the German Physical Society (1916–1918).[34][35]

In 1911, he had calculated that, based on his new theory of general relativity, light from another star would be bent by the Sun's gravity. That prediction was claimed confirmed by observations made by a British expedition led by Sir Arthur Eddington during the solar eclipse of May 29, 1919. International media reports of this made Einstein world famous. On 7 November 1919, the leading British newspaper The Times printed a banner headline that read: "Revolution in Science – New Theory of the Universe – Newtonian Ideas Overthrown".[36] (Much later, questions were raised whether the measurements were accurate enough to support Einstein's theory.)

In 1921, Einstein was awarded the Nobel Prize in Physics. Because relativity was still considered somewhat controversial, it was officially bestowed for his explanation of the photoelectric effect. He also received the Copley Medal from the Royal Society in 1925.
Travels abroad

Einstein visited New York City for the first time on 2 April 1921, where he received an official welcome by the Mayor, followed by three weeks of lectures and receptions. He went on to deliver several lectures at Columbia University and Princeton University, and in Washington he accompanied representatives of the National Academy of Science on a visit to the White House. On his return to Europe he was the guest of the British statesman and philosopher Viscount Haldane in London, where he met several renowned scientific, intellectual and political figures, and delivered a lecture at Kings College.[37]

In 1922, he traveled throughout Asia and later to Palestine, as part of a six-month excursion and speaking tour. His travels included Singapore, Ceylon, and Japan, where he gave a series of lectures to thousands of Japanese. His first lecture in Tokyo lasted four hours, after which he met the emperor and empress at the Imperial Palace where thousands came to watch. Einstein later gave his impressions of the Japanese in a letter to his sons:[38]:307 "Of all the people I have met, I like the Japanese most, as they are modest, intelligent, considerate, and have a feel for art."[38]:308

On his return voyage, he also visited Palestine for 12 days in what would become his only visit to that region. "He was greeted with great British pomp, as if he were a head of state rather than a theoretical physicist", writes Isaacson. This included a cannon salute upon his arrival at the residence of the British high commissioner, Sir Herbert Samuel. During one reception given to him, the building was "stormed by throngs who wanted to hear him". In Einstein's talk to the audience, he expressed his happiness over the event:

I consider this the greatest day of my life. Before, I have always found something to regret in the Jewish soul, and that is the forgetfulness of its own people. Today, I have been made happy by the sight of the Jewish people learning to recognize themselves and to make themselves recognized as a force in the world.[39]:308


Emigration from Germany
In 1933, Einstein decided to emigrate to the United States due to the rise to power of the Nazis under Germany's new chancellor, Adolf Hitler.[40] While visiting American universities in April, 1933, he learned that the new German government had passed a law barring Jews from holding any official positions, including teaching at universities. A month later, the Nazi book burnings occurred, with Einstein's works being among those burnt, and Nazi propaganda minister Joseph Goebbels proclaimed, "Jewish intellectualism is dead."[39] Einstein also learned that his name was on a list of assassination targets, with a "$5,000 bounty on his head". One German magazine included him in a list of enemies of the German regime with the phrase, "not yet hanged".[39]

Einstein was undertaking his third two-month visiting professorship at the California Institute of Technology when Hitler came to power in Germany. On his return to Europe in March 1933 he resided in Belgium for some months, before temporarily moving to England.[41]

He took up a position at the Institute for Advanced Study at Princeton, New Jersey,[42] an affiliation that lasted until his death in 1955. There, he tried to develop a unified field theory and to refute the accepted interpretation of quantum physics, both unsuccessfully. He and Kurt Gödel, another Institute member, became close friends. They would take long walks together discussing their work. His last assistant was Bruria Kaufman, who later became a renowned physicist.

Other scientists also fled to America. Among them were Nobel laureates and professors of theoretical physics. With so many other Jewish scientists now forced by circumstances to live in America, often working side by side, Einstein wrote to a friend, "For me the most beautiful thing is to be in contact with a few fine Jews—a few millennia of a civilized past do mean something after all." In another letter he writes, "In my whole life I have never felt so Jewish as now."[39]


World War II and the Manhattan Project
In 1939, a group of Hungarian scientists that included Hungarian emigre physicist Leó Szilárd attempted to alert Washington of ongoing Nazi atomic bomb research. The group's warnings were discounted.[43]

In the summer of 1939, a few months before the beginning of World War II in Europe, Einstein was persuaded to lend his prestige by writing a letter, with Leó Szilárd, to President Franklin D. Roosevelt, in order to alert him of the possibility that Nazi Germany might be developing an atomic bomb. At the same time, the letter recommended that the U.S. government should pay attention to and become directly involved with uranium research, and associated chain reaction research. Einstein and Szilárd, along with other refugees such as Edward Teller and Eugene Wigner, "regarded it as their responsibility to alert Americans to the possibility that German scientists might win the race to build an atomic bomb, and to warn that Hitler would be more than willing to resort to such a weapon."[38]:630 [44]

The letter is believed to be "arguably the key stimulus for the U.S. adoption of serious investigations into nuclear weapons on the eve of the U.S. entry into World War II".[45] President Roosevelt could not take the risk of allowing Hitler to possess atomic bombs first. As a result of Einstein's letter and his meetings with Roosevelt, the U.S. entered the "race" to develop the bomb, drawing on its "immense material, financial, and scientific resources" to initiate the Manhattan Project. It became the only country to develop an atomic bomb during World War II.

For Einstein, "war was a disease . . . [and] he called for resistance to war." But in 1933, after Hitler assumed full power in Germany, "he renounced pacifism altogether . . . In fact, he urged the Western powers to prepare themselves against another German onslaught."[46]:110 In 1954, a year before his death, Einstein said to his old friend, Linus Pauling, "I made one great mistake in my life — when I signed the letter to President Roosevelt recommending that atom bombs be made; but there was some justification — the danger that the Germans would make them..."[47]

U.S. citizenship
Einstein became an American citizen in 1940. Not long after settling into his career at Princeton, he expressed his appreciation of the "meritocracy" in American culture when compared to Europe. According to Isaacson, he recognized the "right of individuals to say and think what they pleased", without social barriers, and as result, the individual was "encouraged" to be more creative, a trait he valued from his own early education. Einstein writes:

What makes the new arrival devoted to this country is the democratic trait among the people. No one humbles himself before another person or class. . . American youth has the good fortune not to have its outlook troubled by outworn traditions.[39]:432
As a member of the National Association for the Advancement of Colored People NAACP at Princeton who campaigned for the civil rights of African Americans, Einstein corresponded with civil rights activist W. E. B. Du Bois, and in 1946 Einstein called racism America's "worst disease".[48] He later stated, "Race prejudice has unfortunately become an American tradition which is uncritically handed down from one generation to the next. The only remedies are enlightenment and education".[49]

After the death of Israel's first president, Chaim Weizmann, in November 1952, Prime Minister David Ben-Gurion offered Einstein the position of President of Israel, a mostly ceremonial post.[50] The offer was presented by Israel's ambassador in Washington, Abba Eban, who explained that the offer "embodies the deepest respect which the Jewish people can repose in any of its sons".[38]:522 However, Einstein declined, and wrote in his response that he was "deeply moved", and "at once saddened and ashamed" that he could not accept it:

All my life I have dealt with objective matters, hence I lack both the natural aptitude and the experience to deal properly with people and to exercise official function. I am the more distressed over these circumstances because my relationship with the Jewish people became my strongest human tie once I achieved complete clarity about our precarious position among the nations of the world.[38]:522 [50][51]

Death
On April 17, 1955, Albert Einstein experienced internal bleeding caused by the rupture of an abdominal aortic aneurysm, which had previously been reinforced surgically by Dr. Rudolph Nissen in 1948.[52] He took the draft of a speech he was preparing for a television appearance commemorating the State of Israel's seventh anniversary with him to the hospital, but he did not live long enough to complete it.[53] Einstein refused surgery, saying: "I want to go when I want. It is tasteless to prolong life artificially. I have done my share, it is time to go. I will do it elegantly."[54] He died in Princeton Hospital early the next morning at the age of 76, having continued to work until near the end.

Einstein's remains were cremated and his ashes were scattered at an undisclosed location.[55][56] During the autopsy, the pathologist of Princeton Hospital, Thomas Stoltz Harvey, removed Einstein's brain for preservation, without the permission of his family, in hope that the neuroscience of the future would be able to discover what made Einstein so intelligent.[57] In his lecture at Einstein's memorial, nuclear physicist Robert Oppenheimer summarized his impression of him as a person:[46]

"He was almost wholly without sophistication and wholly without worldliness . . . There was always with him a wonderful purity at once childlike and profoundly stubborn."

From Wikipedia, the free encyclopedia

TOMBOL SHARE MELAYANG

Untuk mempercantik blog supaya enak untuk dilihat tak ada salahnya kita melakukan berbagai fariasi-fariasi template di dalamnya.
Langsung saja, berikut ini cara membuat tombol share melayang di kanan atau kiri blog kita.

Masuk ke blog kamu
Kemudian Pilih design
Lalu pada page elements add a gadgets
Kemudian pilih HTML/JavaScript


copy kode berikut





kemudian paste pada gadget HTML/JavaScript tadi

selamat mencoba

Happy Blogging :)

MENGHILANGKAN TANGGAL POSTING

Bermasalah dengan tanggal posting???
Gampang tinggal ikuti langkahnya sebagai berikut:

Masuk menu Layout
kemudian masuk Edit HTML
dan cari code yang mirip seperti ini di Blog Anda

h2.date-header {
margin:.5em 0 0;
padding:0;
font-size:75%;
color:#777;
}

nah jika sudah ketemu tambahkan code Css visibility:hidden; kedalam Css diatas sehingga menjadi seperti

h2.date-header {
margin:.5em 0 0;
padding:0;
font-size:75%;
color:#777;
visibility:hidden;
}

kemudian Simpan pengaturanya..

Selamat mencoba,
Happy Blogging :)

MENGHILANGKAN NAVBAR

Terkadang ada yang merasa tidak nyaman dengan navbar yang berada diatas bog yang kita punya.
Untukmenghilangkan navbar tersebut berikut ini caranya

1. Kamu harus Login dulu di Blogger.com / Blogspot.com
2.  Pilih Layout --> Edit HTML
3. Copy script berikut ke dalam tag head

#navbar-iframe {
display: none !important;
}

contohnya :
-----------------------------------------------
Blogger Template Style
Name: Son of Moto (Mean Green Blogging Machine variation)
Designer: Jeffrey Zeldman
URL: www.zeldman.com
Date: 23 Feb 2004
Updated by: Blogger Team
----------------------------------------------- */

#navbar-iframe {
display: none !important;
}

/* Variable definitions
====================

4. Kemudian simpan.


Selama Mencoba.


Happy Blogging :)

MENGHILANGKAN HEADER BLOG

Langkah pertama yang harus dilakukan

Masuk menu Layout 

kemudian  Edit HTML

kemudian cari Code di blog Anda yang mirip seperti dibawah
(atau dengan ctrl+f untuk search lebih cepat)

#header h1 {
margin:50;
padding:5px 0 0 10px;
font-size: 100%;
font-weight:bold;
line-height: 1.2em;
letter-spacing:.0em;
font-style:italic;
color:#FFFFFF;
}

jika udah ketemu, sekarang tinggal masukkan code  visibility:hidden;
maka jadinya akan sebagai berikut :

#header h1 {
margin:50;
padding:5px 0 0 10px;
font-size: 100%;
font-weight:bold;
line-height: 1.2em;
letter-spacing:.0em;
font-style:italic;
color:#FFFFFF;
visibility:hidden;
}

Selamat Mencoba

Happy Blogging  :)